Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

56 files changed, 9709 insertions, 0 deletions

diff --git a/third_party/rust/metal/.cargo-checksum.json b/third_party/rust/metal/.cargo-checksum.json
new file mode 100644
index 0000000000..e51006b4cc
--- /dev/null
+++ b/third_party/rust/metal/.cargo-checksum.json
@@ -0,0 +1 @@
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diff --git a/third_party/rust/metal/Cargo.lock b/third_party/rust/metal/Cargo.lock
new file mode 100644
index 0000000000..4017d7463a
--- /dev/null
+++ b/third_party/rust/metal/Cargo.lock
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diff --git a/third_party/rust/metal/Cargo.toml b/third_party/rust/metal/Cargo.toml
new file mode 100644
index 0000000000..5ab3c77ca2
--- /dev/null
+++ b/third_party/rust/metal/Cargo.toml
@@ -0,0 +1,100 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies
+#
+# If you believe there's an error in this file please file an
+# issue against the rust-lang/cargo repository. If you're
+# editing this file be aware that the upstream Cargo.toml
+# will likely look very different (and much more reasonable)
+
+[package]
+edition = "2018"
+name = "metal"
+version = "0.20.0"
+authors = ["GFX Developers"]
+exclude = ["guide/**/*", "examples/texture/**/*", "tests/**/*", "Cargo.lock", "target/**/*"]
+description = "Rust bindings for Metal"
+homepage = "https://github.com/gfx-rs/metal-rs"
+documentation = "https://docs.rs/crate/metal"
+readme = "README.md"
+keywords = ["metal", "graphics", "bindings"]
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/gfx-rs/metal-rs"
+[package.metadata.docs.rs]
+default-target = "x86_64-apple-darwin"
+
+[[example]]
+name = "window"
+
+[[example]]
+name = "headless-render"
+
+[[example]]
+name = "library"
+
+[[example]]
+name = "reflection"
+
+[[example]]
+name = "caps"
+
+[[example]]
+name = "argument-buffer"
+
+[[example]]
+name = "circle"
+path = "examples/circle/main.rs"
+
+[[example]]
+name = "compute"
+path = "examples/compute/main.rs"
+
+[[example]]
+name = "embedded-lib"
+path = "examples/compute/embedded-lib.rs"
+
+[[example]]
+name = "compute-argument-buffer"
+path = "examples/compute/compute-argument-buffer.rs"
+
+[[example]]
+name = "bind"
+[dependencies.bitflags]
+version = "1"
+
+[dependencies.block]
+version = "0.1.5"
+
+[dependencies.cocoa-foundation]
+version = "0.1"
+
+[dependencies.foreign-types]
+version = "0.3"
+
+[dependencies.log]
+version = "0.4"
+
+[dependencies.objc]
+version = "0.2.4"
+features = ["objc_exception"]
+[dev-dependencies.cocoa]
+version = "0.23"
+
+[dev-dependencies.cty]
+version = "0.2.1"
+
+[dev-dependencies.png]
+version = "0.16"
+
+[dev-dependencies.sema]
+version = "0.1.4"
+
+[dev-dependencies.winit]
+version = "0.22"
+
+[features]
+default = []
+private = []
diff --git a/third_party/rust/metal/LICENSE-APACHE b/third_party/rust/metal/LICENSE-APACHE
new file mode 100644
index 0000000000..16fe87b06e
--- /dev/null
+++ b/third_party/rust/metal/LICENSE-APACHE
@@ -0,0 +1,201 @@
+                              Apache License
+                        Version 2.0, January 2004
+                     http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
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+   "License" shall mean the terms and conditions for use, reproduction,
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+   any Contribution intentionally submitted for inclusion in the Work
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+   the terms of any separate license agreement you may have executed
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+6. Trademarks. This License does not grant permission to use the trade
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+END OF TERMS AND CONDITIONS
+
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diff --git a/third_party/rust/metal/LICENSE-MIT b/third_party/rust/metal/LICENSE-MIT
new file mode 100644
index 0000000000..25597d5838
--- /dev/null
+++ b/third_party/rust/metal/LICENSE-MIT
@@ -0,0 +1,25 @@
+Copyright (c) 2010 The Rust Project Developers
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/third_party/rust/metal/Makefile b/third_party/rust/metal/Makefile
new file mode 100644
index 0000000000..bc35876945
--- /dev/null
+++ b/third_party/rust/metal/Makefile
@@ -0,0 +1,12 @@
+
+compute:
+	xcrun -sdk macosx metal -c examples/compute/shaders.metal -o examples/compute/shaders.air
+	xcrun -sdk macosx metallib examples/compute/shaders.air -o examples/compute/shaders.metallib
+
+window:
+	xcrun -sdk macosx metal -c examples/window/shaders.metal -o examples/window/shaders.air
+	xcrun -sdk macosx metallib examples/window/shaders.air -o examples/window/shaders.metallib
+
+circle:
+	xcrun -sdk macosx metal -c examples/circle/shaders.metal -o examples/circle/shaders.air
+	xcrun -sdk macosx metallib examples/circle/shaders.air -o examples/circle/shaders.metallib
diff --git a/third_party/rust/metal/README.md b/third_party/rust/metal/README.md
new file mode 100644
index 0000000000..7fac036e5f
--- /dev/null
+++ b/third_party/rust/metal/README.md
@@ -0,0 +1,32 @@
+# metal-rs
+[![Actions Status](https://github.com/gfx-rs/metal-rs/workflows/ci/badge.svg)](https://github.com/gfx-rs/metal-rs/actions)
+[![Crates.io](https://img.shields.io/crates/v/metal.svg?label=metal)](https://crates.io/crates/metal)
+
+Unsafe Rust bindings for the Metal 3D Graphics API.
+
+## Examples
+
+The [examples](/examples) directory highlights different ways of using the Metal graphics API for rendering
+and computation.
+
+Examples can be run using commands such as:
+
+```
+# Replace `window` with the name of the example that you would like to run
+cargo run --example window
+```
+
+## License
+
+Licensed under either of
+
+ * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
+dual licensed as above, without any additional terms or conditions.
diff --git a/third_party/rust/metal/bors.toml b/third_party/rust/metal/bors.toml
new file mode 100644
index 0000000000..bb41b7ae97
--- /dev/null
+++ b/third_party/rust/metal/bors.toml
@@ -0,0 +1,8 @@
+status = [ "Build" ]
+
+# As of May 2020 we can expect CI to take roughly 3 minutes based on
+# Based on https://github.com/chinedufn/metal-rs/actions/runs/94020785
+#
+# We round this up to a timeout of 5 minutes to account for any potential future
+# inconsistencies in CI run times.
+timeout-sec = 300
diff --git a/third_party/rust/metal/examples/argument-buffer/main.rs b/third_party/rust/metal/examples/argument-buffer/main.rs
new file mode 100644
index 0000000000..2ab1346ab1
--- /dev/null
+++ b/third_party/rust/metal/examples/argument-buffer/main.rs
@@ -0,0 +1,43 @@
+// Copyright 2017 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+#[macro_use]
+extern crate objc;
+
+use metal::*;
+
+use cocoa::foundation::NSAutoreleasePool;
+
+fn main() {
+    let pool = unsafe { NSAutoreleasePool::new(cocoa::base::nil) };
+
+    let device = Device::system_default().expect("no device found");
+
+    let desc1 = ArgumentDescriptor::new();
+    desc1.set_data_type(MTLDataType::Texture);
+    let desc2 = ArgumentDescriptor::new();
+    desc2.set_data_type(MTLDataType::Sampler);
+    desc2.set_index(1);
+
+    let encoder = device.new_argument_encoder(&Array::from_slice(&[desc1, desc2]));
+    println!("{:?}", encoder);
+
+    let buffer = device.new_buffer(encoder.encoded_length(), MTLResourceOptions::empty());
+    encoder.set_argument_buffer(&buffer, 0);
+
+    let sampler = {
+        let descriptor = SamplerDescriptor::new();
+        descriptor.set_support_argument_buffers(true);
+        device.new_sampler(&descriptor)
+    };
+    encoder.set_sampler_state(1, &sampler);
+    println!("{:?}", sampler);
+
+    unsafe {
+        let () = msg_send![pool, release];
+    }
+}
diff --git a/third_party/rust/metal/examples/bind/main.rs b/third_party/rust/metal/examples/bind/main.rs
new file mode 100644
index 0000000000..908aefcb41
--- /dev/null
+++ b/third_party/rust/metal/examples/bind/main.rs
@@ -0,0 +1,42 @@
+// Copyright 2018 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+#[macro_use]
+extern crate objc;
+
+use metal::*;
+
+use cocoa::foundation::NSAutoreleasePool;
+
+fn main() {
+    let pool = unsafe { NSAutoreleasePool::new(cocoa::base::nil) };
+
+    let device = Device::system_default().expect("no device found");
+
+    let buffer = device.new_buffer(4, MTLResourceOptions::empty());
+    let sampler = {
+        let descriptor = SamplerDescriptor::new();
+        device.new_sampler(&descriptor)
+    };
+
+    let queue = device.new_command_queue();
+    let cmd_buf = queue.new_command_buffer();
+
+    let encoder = cmd_buf.new_compute_command_encoder();
+
+    encoder.set_buffers(2, &[Some(&buffer), None], &[4, 0]);
+    encoder.set_sampler_states(1, &[Some(&sampler), None]);
+
+    encoder.end_encoding();
+    cmd_buf.commit();
+
+    println!("Everything is bound");
+
+    unsafe {
+        let () = msg_send![pool, release];
+    }
+}
diff --git a/third_party/rust/metal/examples/caps/main.rs b/third_party/rust/metal/examples/caps/main.rs
new file mode 100644
index 0000000000..76030954ef
--- /dev/null
+++ b/third_party/rust/metal/examples/caps/main.rs
@@ -0,0 +1,32 @@
+// Copyright 2017 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+use metal::*;
+
+fn main() {
+    let device = Device::system_default().expect("no device found");
+
+    #[cfg(feature = "private")]
+    {
+        println!("Vendor: {:?}", unsafe { device.vendor() });
+        println!("Family: {:?}", unsafe { device.family_name() });
+    }
+    println!(
+        "Max threads per threadgroup: {:?}",
+        device.max_threads_per_threadgroup()
+    );
+    #[cfg(target_os = "macos")]
+    {
+        println!("Integrated GPU: {:?}", device.is_low_power());
+        println!("Headless: {:?}", device.is_headless());
+        println!("D24S8: {:?}", device.d24_s8_supported());
+    }
+    println!(
+        "Indirect argument buffer: {:?}",
+        device.argument_buffers_support()
+    );
+}
diff --git a/third_party/rust/metal/examples/circle/README.md b/third_party/rust/metal/examples/circle/README.md
new file mode 100644
index 0000000000..f51853ac38
--- /dev/null
+++ b/third_party/rust/metal/examples/circle/README.md
@@ -0,0 +1,11 @@
+## circle
+
+Renders a circle in a window. As metal primitive types are only limited to point, line and triangle shape, this example shows how we can form complex structures out of primitive types.
+
+![Screenshot of the final render](./screenshot.png)
+
+## To Run
+
+```
+cargo run --example circle
+```
diff --git a/third_party/rust/metal/examples/circle/main.rs b/third_party/rust/metal/examples/circle/main.rs
new file mode 100644
index 0000000000..70a7d22668
--- /dev/null
+++ b/third_party/rust/metal/examples/circle/main.rs
@@ -0,0 +1,215 @@
+use metal::*;
+
+use winit::platform::macos::WindowExtMacOS;
+use winit::{
+    event::{Event, WindowEvent},
+    event_loop::{ControlFlow, EventLoop},
+};
+
+use cocoa::{appkit::NSView, base::id as cocoa_id};
+
+use objc::runtime::YES;
+
+use std::mem;
+
+// Declare the data structures needed to carry vertex layout to
+// metal shading language(MSL) program. Use #[repr(C)], to make
+// the data structure compatible with C++ type data structure
+// for vertex defined in MSL program as MSL program is broadly
+// based on C++
+#[repr(C)]
+#[derive(Debug)]
+pub struct position(cty::c_float, cty::c_float);
+#[repr(C)]
+#[derive(Debug)]
+pub struct color(cty::c_float, cty::c_float, cty::c_float);
+#[repr(C)]
+#[derive(Debug)]
+pub struct AAPLVertex {
+    p: position,
+    c: color,
+}
+
+fn main() {
+    // Create a window for viewing the content
+    let event_loop = EventLoop::new();
+    let events_loop = winit::event_loop::EventLoop::new();
+    let size = winit::dpi::LogicalSize::new(800, 600);
+
+    let window = winit::window::WindowBuilder::new()
+        .with_inner_size(size)
+        .with_title("Metal".to_string())
+        .build(&events_loop)
+        .unwrap();
+
+    // Set up the GPU device found in the system
+    let device = Device::system_default().expect("no device found");
+    println!("Your device is: {}", device.name(),);
+
+    let library_path = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"))
+        .join("examples/circle/shaders.metallib");
+
+    // Use the metallib file generated out of .metal shader file
+    let library = device.new_library_with_file(library_path).unwrap();
+
+    // The render pipeline generated from the vertex and fragment shaders in the .metal shader file.
+    let pipeline_state = prepare_pipeline_state(&device, &library);
+
+    // Set the command queue used to pass commands to the device.
+    let command_queue = device.new_command_queue();
+
+    // Currently, CoreAnimationLayer is the only interface that provide
+    // layers to carry drawable texture from GPU rendaring through metal
+    // library to viewable windows.
+    let layer = CoreAnimationLayer::new();
+    layer.set_device(&device);
+    layer.set_pixel_format(MTLPixelFormat::BGRA8Unorm);
+    layer.set_presents_with_transaction(false);
+
+    unsafe {
+        let view = window.ns_view() as cocoa_id;
+        view.setWantsLayer(YES);
+        view.setLayer(mem::transmute(layer.as_ref()));
+    }
+
+    let draw_size = window.inner_size();
+    layer.set_drawable_size(CGSize::new(draw_size.width as f64, draw_size.height as f64));
+
+    let vbuf = {
+        let vertex_data = create_vertex_points_for_circle();
+        let vertex_data = vertex_data.as_slice();
+
+        device.new_buffer_with_data(
+            vertex_data.as_ptr() as *const _,
+            (vertex_data.len() * mem::size_of::<AAPLVertex>()) as u64,
+            MTLResourceOptions::CPUCacheModeDefaultCache | MTLResourceOptions::StorageModeManaged,
+        )
+    };
+
+    event_loop.run(move |event, _, control_flow| {
+        // ControlFlow::Wait pauses the event loop if no events are available to process.
+        // This is ideal for non-game applications that only update in response to user
+        // input, and uses significantly less power/CPU time than ControlFlow::Poll.
+        *control_flow = ControlFlow::Wait;
+
+        match event {
+            Event::WindowEvent {
+                event: WindowEvent::CloseRequested,
+                ..
+            } => {
+                println!("The close button was pressed; stopping");
+                *control_flow = ControlFlow::Exit
+            }
+            Event::MainEventsCleared => {
+                // Queue a RedrawRequested event.
+                window.request_redraw();
+            }
+            Event::RedrawRequested(_) => {
+                // It's preferrable to render in this event rather than in MainEventsCleared, since
+                // rendering in here allows the program to gracefully handle redraws requested
+                // by the OS.
+                let drawable = match layer.next_drawable() {
+                    Some(drawable) => drawable,
+                    None => return,
+                };
+
+                // Create a new command buffer for each render pass to the current drawable
+                let command_buffer = command_queue.new_command_buffer();
+
+                // Obtain a renderPassDescriptor generated from the view's drawable textures.
+                let render_pass_descriptor = RenderPassDescriptor::new();
+                prepare_render_pass_descriptor(&render_pass_descriptor, drawable.texture());
+
+                // Create a render command encoder.
+                let encoder = command_buffer.new_render_command_encoder(&render_pass_descriptor);
+                encoder.set_render_pipeline_state(&pipeline_state);
+                // Pass in the parameter data.
+                encoder.set_vertex_buffer(0, Some(&vbuf), 0);
+                // Draw the triangles which will eventually form the circle.
+                encoder.draw_primitives(MTLPrimitiveType::TriangleStrip, 0, 1080);
+                encoder.end_encoding();
+
+                // Schedule a present once the framebuffer is complete using the current drawable.
+                command_buffer.present_drawable(&drawable);
+
+                // Finalize rendering here & push the command buffer to the GPU.
+                command_buffer.commit();
+            }
+            _ => (),
+        }
+    });
+}
+
+// If we want to draw a circle, we need to draw it out of the three primitive
+// types available with metal framework. Triangle is used in this case to form
+// the circle. If we consider a circle to be total of 360 degree at center, we
+// can form small triangle with one point at origin and two points at the
+// perimeter of the circle for each degree. Eventually, if we can take enough
+// triangle virtices for total of 360 degree, the triangles together will
+// form a circle. This function captures the triangle vertices for each degree
+// and push the co-ordinates of the vertices to a rust vector
+fn create_vertex_points_for_circle() -> Vec<AAPLVertex> {
+    let mut v: Vec<AAPLVertex> = Vec::new();
+    let origin_x: f32 = 0.0;
+    let origin_y: f32 = 0.0;
+
+    // Size of the circle
+    let circle_size = 0.8f32;
+
+    for i in 0..720 {
+        let y = i as f32;
+        // Get the X co-ordinate of each point on the perimeter of circle
+        let position_x: f32 = y.to_radians().cos() * 100.0;
+        let position_x: f32 = position_x.trunc() / 100.0;
+        // Set the size of the circle
+        let position_x: f32 = position_x * circle_size;
+        // Get the Y co-ordinate of each point on the perimeter of circle
+        let position_y: f32 = y.to_radians().sin() * 100.0;
+        let position_y: f32 = position_y.trunc() / 100.0;
+        // Set the size of the circle
+        let position_y: f32 = position_y * circle_size;
+
+        v.push(AAPLVertex {
+            p: position(position_x, position_y),
+            c: color(0.7, 0.3, 0.5),
+        });
+
+        if (i + 1) % 2 == 0 {
+            // For each two points on perimeter, push one point of origin
+            v.push(AAPLVertex {
+                p: position(origin_x, origin_y),
+                c: color(0.2, 0.7, 0.4),
+            });
+        }
+    }
+
+    v
+}
+
+fn prepare_render_pass_descriptor(descriptor: &RenderPassDescriptorRef, texture: &TextureRef) {
+    let color_attachment = descriptor.color_attachments().object_at(0).unwrap();
+
+    color_attachment.set_texture(Some(texture));
+    color_attachment.set_load_action(MTLLoadAction::Clear);
+    // Setting a background color
+    color_attachment.set_clear_color(MTLClearColor::new(0.5, 0.5, 0.8, 1.0));
+    color_attachment.set_store_action(MTLStoreAction::Store);
+}
+
+fn prepare_pipeline_state(device: &Device, library: &Library) -> RenderPipelineState {
+    let vert = library.get_function("vs", None).unwrap();
+    let frag = library.get_function("ps", None).unwrap();
+
+    let pipeline_state_descriptor = RenderPipelineDescriptor::new();
+    pipeline_state_descriptor.set_vertex_function(Some(&vert));
+    pipeline_state_descriptor.set_fragment_function(Some(&frag));
+    pipeline_state_descriptor
+        .color_attachments()
+        .object_at(0)
+        .unwrap()
+        .set_pixel_format(MTLPixelFormat::BGRA8Unorm);
+
+    device
+        .new_render_pipeline_state(&pipeline_state_descriptor)
+        .unwrap()
+}
diff --git a/third_party/rust/metal/examples/circle/screenshot.png b/third_party/rust/metal/examples/circle/screenshot.png
new file mode 100644
index 0000000000..38f86e733d
--- /dev/null
+++ b/third_party/rust/metal/examples/circle/screenshot.png
diff --git a/third_party/rust/metal/examples/circle/shaders.metal b/third_party/rust/metal/examples/circle/shaders.metal
new file mode 100644
index 0000000000..037af8a233
--- /dev/null
+++ b/third_party/rust/metal/examples/circle/shaders.metal
@@ -0,0 +1,39 @@
+#include <metal_stdlib>
+
+#include <simd/simd.h>
+
+using namespace metal;
+
+typedef struct {
+  float x;
+  float y;
+}position;
+
+typedef struct {
+  float r;
+  float g;
+  float b;
+}color;
+
+typedef struct {
+  position p;
+  color c;
+}AAPLVertex;
+
+struct ColorInOut {
+  float4 position[[position]];
+  float4 color;
+};
+
+vertex ColorInOut vs(constant AAPLVertex * vertex_array[[buffer(0)]], unsigned int vid[[vertex_id]]) {
+  ColorInOut out;
+
+  out.position = float4(float2(vertex_array[vid].p.x, vertex_array[vid].p.y), 0.0, 1.0);
+  out.color = float4(float3(vertex_array[vid].c.r, vertex_array[vid].c.g, vertex_array[vid].c.b), 1.0);
+
+  return out;
+}
+
+fragment float4 ps(ColorInOut in [[stage_in]]) {
+  return in.color;
+}
diff --git a/third_party/rust/metal/examples/circle/shaders.metallib b/third_party/rust/metal/examples/circle/shaders.metallib
new file mode 100644
index 0000000000..cbb9bc5e5a
--- /dev/null
+++ b/third_party/rust/metal/examples/circle/shaders.metallib
diff --git a/third_party/rust/metal/examples/compute/compute-argument-buffer.metal b/third_party/rust/metal/examples/compute/compute-argument-buffer.metal
new file mode 100644
index 0000000000..1dcc79daf5
--- /dev/null
+++ b/third_party/rust/metal/examples/compute/compute-argument-buffer.metal
@@ -0,0 +1,14 @@
+#include <metal_stdlib>
+
+using namespace metal;
+
+struct SumInput {
+    device uint *data;
+    volatile device atomic_uint *sum;
+};
+
+kernel void sum(device SumInput& input [[ buffer(0) ]],
+                uint gid [[ thread_position_in_grid ]])
+{
+    atomic_fetch_add_explicit(input.sum, input.data[gid], memory_order_relaxed);
+}
diff --git a/third_party/rust/metal/examples/compute/compute-argument-buffer.rs b/third_party/rust/metal/examples/compute/compute-argument-buffer.rs
new file mode 100644
index 0000000000..be554b1cc1
--- /dev/null
+++ b/third_party/rust/metal/examples/compute/compute-argument-buffer.rs
@@ -0,0 +1,101 @@
+// Copyright 2017 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+#[macro_use]
+extern crate objc;
+
+use metal::*;
+
+use cocoa::foundation::NSAutoreleasePool;
+
+use std::mem;
+
+static LIBRARY_SRC: &str = include_str!("compute-argument-buffer.metal");
+
+fn main() {
+    let pool = unsafe { NSAutoreleasePool::new(cocoa::base::nil) };
+    let device = Device::system_default().expect("no device found");
+    let command_queue = device.new_command_queue();
+
+    let data = [
+        1u32, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
+        25, 26, 27, 28, 29, 30,
+    ];
+
+    let buffer = device.new_buffer_with_data(
+        unsafe { mem::transmute(data.as_ptr()) },
+        (data.len() * mem::size_of::<u32>()) as u64,
+        MTLResourceOptions::CPUCacheModeDefaultCache,
+    );
+
+    let sum = {
+        let data = [0u32];
+        device.new_buffer_with_data(
+            unsafe { mem::transmute(data.as_ptr()) },
+            (data.len() * mem::size_of::<u32>()) as u64,
+            MTLResourceOptions::CPUCacheModeDefaultCache,
+        )
+    };
+
+    let command_buffer = command_queue.new_command_buffer();
+    let encoder = command_buffer.new_compute_command_encoder();
+
+    let library = device
+        .new_library_with_source(LIBRARY_SRC, &CompileOptions::new())
+        .unwrap();
+    let kernel = library.get_function("sum", None).unwrap();
+
+    let argument_encoder = kernel.new_argument_encoder(0);
+    let arg_buffer = device.new_buffer(
+        argument_encoder.encoded_length(),
+        MTLResourceOptions::empty(),
+    );
+    argument_encoder.set_argument_buffer(&arg_buffer, 0);
+    argument_encoder.set_buffer(0, &buffer, 0);
+    argument_encoder.set_buffer(1, &sum, 0);
+
+    let pipeline_state_descriptor = ComputePipelineDescriptor::new();
+    pipeline_state_descriptor.set_compute_function(Some(&kernel));
+
+    let pipeline_state = device
+        .new_compute_pipeline_state_with_function(
+            pipeline_state_descriptor.compute_function().unwrap(),
+        )
+        .unwrap();
+
+    encoder.set_compute_pipeline_state(&pipeline_state);
+    encoder.set_buffer(0, Some(&arg_buffer), 0);
+
+    encoder.use_resource(&buffer, MTLResourceUsage::Read);
+    encoder.use_resource(&sum, MTLResourceUsage::Write);
+
+    let width = 16;
+
+    let thread_group_count = MTLSize {
+        width,
+        height: 1,
+        depth: 1,
+    };
+
+    let thread_group_size = MTLSize {
+        width: (data.len() as u64 + width) / width,
+        height: 1,
+        depth: 1,
+    };
+
+    encoder.dispatch_thread_groups(thread_group_count, thread_group_size);
+    encoder.end_encoding();
+    command_buffer.commit();
+    command_buffer.wait_until_completed();
+
+    let ptr = sum.contents() as *mut u32;
+
+    unsafe {
+        assert_eq!(465, *ptr);
+        let () = msg_send![pool, release];
+    }
+}
diff --git a/third_party/rust/metal/examples/compute/embedded-lib.rs b/third_party/rust/metal/examples/compute/embedded-lib.rs
new file mode 100644
index 0000000000..7ed61f7207
--- /dev/null
+++ b/third_party/rust/metal/examples/compute/embedded-lib.rs
@@ -0,0 +1,31 @@
+// Copyright 2017 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+#[macro_use]
+extern crate objc;
+
+use metal::*;
+
+use cocoa::foundation::NSAutoreleasePool;
+
+fn main() {
+    let library_data = include_bytes!("shaders.metallib");
+
+    let pool = unsafe { NSAutoreleasePool::new(cocoa::base::nil) };
+    let device = Device::system_default().expect("no device found");
+
+    let library = device.new_library_with_data(&library_data[..]).unwrap();
+    let kernel = library.get_function("sum", None).unwrap();
+
+    println!("Function name: {}", kernel.name());
+    println!("Function type: {:?}", kernel.function_type());
+    println!("OK");
+
+    unsafe {
+        let () = msg_send![pool, release];
+    }
+}
diff --git a/third_party/rust/metal/examples/compute/main.rs b/third_party/rust/metal/examples/compute/main.rs
new file mode 100644
index 0000000000..efc930d8ca
--- /dev/null
+++ b/third_party/rust/metal/examples/compute/main.rs
@@ -0,0 +1,97 @@
+// Copyright 2017 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+#[macro_use]
+extern crate objc;
+
+use metal::*;
+
+use cocoa::foundation::NSAutoreleasePool;
+
+use std::mem;
+
+fn main() {
+    let pool = unsafe { NSAutoreleasePool::new(cocoa::base::nil) };
+    let device = Device::system_default().expect("no device found");
+    let command_queue = device.new_command_queue();
+
+    let data = [
+        1u32, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
+        25, 26, 27, 28, 29, 30,
+    ];
+
+    let buffer = device.new_buffer_with_data(
+        unsafe { mem::transmute(data.as_ptr()) },
+        (data.len() * mem::size_of::<u32>()) as u64,
+        MTLResourceOptions::CPUCacheModeDefaultCache,
+    );
+
+    let sum = {
+        let data = [0u32];
+        device.new_buffer_with_data(
+            unsafe { mem::transmute(data.as_ptr()) },
+            (data.len() * mem::size_of::<u32>()) as u64,
+            MTLResourceOptions::CPUCacheModeDefaultCache,
+        )
+    };
+
+    let command_buffer = command_queue.new_command_buffer();
+
+    command_buffer.set_label("label");
+    let block = block::ConcreteBlock::new(move |buffer: &metal::CommandBufferRef| {
+        println!("{}", buffer.label());
+    })
+    .copy();
+
+    command_buffer.add_completed_handler(&block);
+
+    let encoder = command_buffer.new_compute_command_encoder();
+    let library_path = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"))
+        .join("examples/compute/shaders.metallib");
+
+    let library = device.new_library_with_file(library_path).unwrap();
+    let kernel = library.get_function("sum", None).unwrap();
+
+    let pipeline_state_descriptor = ComputePipelineDescriptor::new();
+    pipeline_state_descriptor.set_compute_function(Some(&kernel));
+
+    let pipeline_state = device
+        .new_compute_pipeline_state_with_function(
+            pipeline_state_descriptor.compute_function().unwrap(),
+        )
+        .unwrap();
+
+    encoder.set_compute_pipeline_state(&pipeline_state);
+    encoder.set_buffer(0, Some(&buffer), 0);
+    encoder.set_buffer(1, Some(&sum), 0);
+
+    let width = 16;
+
+    let thread_group_count = MTLSize {
+        width,
+        height: 1,
+        depth: 1,
+    };
+
+    let thread_group_size = MTLSize {
+        width: (data.len() as u64 + width) / width,
+        height: 1,
+        depth: 1,
+    };
+
+    encoder.dispatch_thread_groups(thread_group_count, thread_group_size);
+    encoder.end_encoding();
+    command_buffer.commit();
+    command_buffer.wait_until_completed();
+
+    let ptr = sum.contents() as *mut u32;
+
+    unsafe {
+        assert_eq!(465, *ptr);
+        let () = msg_send![pool, release];
+    }
+}
diff --git a/third_party/rust/metal/examples/compute/shaders.metal b/third_party/rust/metal/examples/compute/shaders.metal
new file mode 100644
index 0000000000..51363a1d36
--- /dev/null
+++ b/third_party/rust/metal/examples/compute/shaders.metal
@@ -0,0 +1,10 @@
+#include <metal_stdlib>
+
+using namespace metal;
+
+kernel void sum(device uint *data [[ buffer(0) ]],
+                volatile device atomic_uint *sum [[ buffer(1) ]],
+                uint gid [[ thread_position_in_grid ]])
+{
+    atomic_fetch_add_explicit(sum, data[gid], memory_order_relaxed);
+}
diff --git a/third_party/rust/metal/examples/compute/shaders.metallib b/third_party/rust/metal/examples/compute/shaders.metallib
new file mode 100644
index 0000000000..af7cb17240
--- /dev/null
+++ b/third_party/rust/metal/examples/compute/shaders.metallib
diff --git a/third_party/rust/metal/examples/headless-render/README.md b/third_party/rust/metal/examples/headless-render/README.md
new file mode 100644
index 0000000000..6bc434b44a
--- /dev/null
+++ b/third_party/rust/metal/examples/headless-render/README.md
@@ -0,0 +1,11 @@
+## headless-render
+
+Renders the triangle from the [window example](../window) headlessly and then writes it to a PNG file.
+
+![Screenshot of the final render](./screenshot.png)
+
+## To Run
+
+```
+cargo run --example headless-render
+```
diff --git a/third_party/rust/metal/examples/headless-render/main.rs b/third_party/rust/metal/examples/headless-render/main.rs
new file mode 100644
index 0000000000..ed68da1a53
--- /dev/null
+++ b/third_party/rust/metal/examples/headless-render/main.rs
@@ -0,0 +1,159 @@
+use std::mem;
+use std::path::PathBuf;
+
+use std::fs::File;
+use std::io::BufWriter;
+
+use metal::{
+    Buffer, Device, DeviceRef, LibraryRef, MTLClearColor, MTLLoadAction, MTLOrigin, MTLPixelFormat,
+    MTLPrimitiveType, MTLRegion, MTLResourceOptions, MTLSize, MTLStoreAction, RenderPassDescriptor,
+    RenderPassDescriptorRef, RenderPipelineDescriptor, RenderPipelineState, Texture,
+    TextureDescriptor, TextureRef,
+};
+use png::ColorType;
+
+const VIEW_WIDTH: u64 = 512;
+const VIEW_HEIGHT: u64 = 512;
+const TOTAL_BYTES: usize = (VIEW_WIDTH * VIEW_HEIGHT * 4) as usize;
+
+const VERTEX_SHADER: &'static str = "triangle_vertex";
+const FRAGMENT_SHADER: &'static str = "triangle_fragment";
+
+// [2 bytes position, 3 bytes color] * 3
+#[rustfmt::skip]
+const VERTEX_ATTRIBS: [f32; 15] = [
+    0.0, 0.5, 1.0, 0.0, 0.0,
+    -0.5, -0.5, 0.0, 1.0, 0.0,
+    0.5, -0.5, 0.0, 0.0, 1.0,
+];
+
+/// This example shows how to render headlessly by:
+///
+/// 1. Rendering a triangle to an MtlDrawable
+///
+/// 2. Waiting for the render to complete and the color texture to be synchronized with the CPU
+///    by using a blit command encoder
+///
+/// 3. Reading the texture bytes from the MtlTexture
+///
+/// 4. Saving the texture to a PNG file
+fn main() {
+    let device = Device::system_default().expect("No device found");
+
+    let texture = create_texture(&device);
+
+    let library_path = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"))
+        .join("examples/window/shaders.metallib");
+
+    let library = device.new_library_with_file(library_path).unwrap();
+
+    let pipeline_state = prepare_pipeline_state(&device, &library);
+
+    let command_queue = device.new_command_queue();
+
+    let vertex_buffer = create_vertex_buffer(&device);
+
+    let render_pass_descriptor = RenderPassDescriptor::new();
+    initialize_color_attachment(&render_pass_descriptor, &texture);
+
+    let command_buffer = command_queue.new_command_buffer();
+    let rc_encoder = command_buffer.new_render_command_encoder(&render_pass_descriptor);
+    rc_encoder.set_render_pipeline_state(&pipeline_state);
+    rc_encoder.set_vertex_buffer(0, Some(&vertex_buffer), 0);
+    rc_encoder.draw_primitives(MTLPrimitiveType::Triangle, 0, 3);
+    rc_encoder.end_encoding();
+
+    render_pass_descriptor
+        .color_attachments()
+        .object_at(0)
+        .unwrap()
+        .set_load_action(MTLLoadAction::DontCare);
+
+    let blit_encoder = command_buffer.new_blit_command_encoder();
+    blit_encoder.synchronize_resource(&texture);
+    blit_encoder.end_encoding();
+
+    command_buffer.commit();
+
+    command_buffer.wait_until_completed();
+
+    save_image(&texture);
+}
+
+fn save_image(texture: &TextureRef) {
+    let mut image = vec![0; TOTAL_BYTES];
+
+    texture.get_bytes(
+        image.as_mut_ptr() as *mut std::ffi::c_void,
+        VIEW_WIDTH * 4,
+        MTLRegion {
+            origin: MTLOrigin { x: 0, y: 0, z: 0 },
+            size: MTLSize {
+                width: VIEW_WIDTH,
+                height: VIEW_HEIGHT,
+                depth: 1,
+            },
+        },
+        0,
+    );
+
+    let out_file =
+        PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("examples/headless-render/out.png");
+    let file = File::create(&out_file).unwrap();
+    let ref mut w = BufWriter::new(file);
+
+    let mut encoder = png::Encoder::new(w, VIEW_WIDTH as u32, VIEW_HEIGHT as u32);
+    encoder.set_color(ColorType::RGBA);
+    encoder.set_depth(png::BitDepth::Eight);
+    let mut writer = encoder.write_header().unwrap();
+
+    writer.write_image_data(&image).unwrap();
+
+    println!("Image saved to {:?}", out_file);
+}
+
+fn create_texture(device: &Device) -> Texture {
+    let texture = TextureDescriptor::new();
+    texture.set_width(VIEW_WIDTH);
+    texture.set_height(VIEW_HEIGHT);
+    texture.set_pixel_format(MTLPixelFormat::RGBA8Unorm);
+
+    device.new_texture(&texture)
+}
+
+fn prepare_pipeline_state(device: &DeviceRef, library: &LibraryRef) -> RenderPipelineState {
+    let vert = library.get_function(VERTEX_SHADER, None).unwrap();
+    let frag = library.get_function(FRAGMENT_SHADER, None).unwrap();
+
+    let pipeline_state_descriptor = RenderPipelineDescriptor::new();
+
+    pipeline_state_descriptor.set_vertex_function(Some(&vert));
+    pipeline_state_descriptor.set_fragment_function(Some(&frag));
+
+    pipeline_state_descriptor
+        .color_attachments()
+        .object_at(0)
+        .unwrap()
+        .set_pixel_format(MTLPixelFormat::RGBA8Unorm);
+
+    device
+        .new_render_pipeline_state(&pipeline_state_descriptor)
+        .unwrap()
+}
+
+fn create_vertex_buffer(device: &DeviceRef) -> Buffer {
+    device.new_buffer_with_data(
+        VERTEX_ATTRIBS.as_ptr() as *const _,
+        (VERTEX_ATTRIBS.len() * mem::size_of::<f32>()) as u64,
+        MTLResourceOptions::CPUCacheModeDefaultCache | MTLResourceOptions::StorageModeManaged,
+    )
+}
+
+fn initialize_color_attachment(descriptor: &RenderPassDescriptorRef, texture: &TextureRef) {
+    let color_attachment = descriptor.color_attachments().object_at(0).unwrap();
+
+    color_attachment.set_texture(Some(texture));
+    color_attachment.set_load_action(MTLLoadAction::Clear);
+    color_attachment.set_clear_color(MTLClearColor::new(0.5, 0.2, 0.2, 1.0));
+    color_attachment.set_store_action(MTLStoreAction::Store);
+}
diff --git a/third_party/rust/metal/examples/headless-render/screenshot.png b/third_party/rust/metal/examples/headless-render/screenshot.png
new file mode 100644
index 0000000000..2af9c5895f
--- /dev/null
+++ b/third_party/rust/metal/examples/headless-render/screenshot.png
diff --git a/third_party/rust/metal/examples/library/main.rs b/third_party/rust/metal/examples/library/main.rs
new file mode 100644
index 0000000000..7223db89c1
--- /dev/null
+++ b/third_party/rust/metal/examples/library/main.rs
@@ -0,0 +1,17 @@
+// Copyright 2016 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+use metal::*;
+
+const PROGRAM: &'static str = "";
+
+fn main() {
+    let device = Device::system_default().expect("no device found");
+
+    let options = CompileOptions::new();
+    let _library = device.new_library_with_source(PROGRAM, &options);
+}
diff --git a/third_party/rust/metal/examples/reflection/main.rs b/third_party/rust/metal/examples/reflection/main.rs
new file mode 100644
index 0000000000..41208d1845
--- /dev/null
+++ b/third_party/rust/metal/examples/reflection/main.rs
@@ -0,0 +1,83 @@
+// Copyright 2016 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+#[macro_use]
+extern crate objc;
+
+use metal::*;
+
+use cocoa::foundation::NSAutoreleasePool;
+
+const PROGRAM: &'static str = "
+    #include <metal_stdlib>\n\
+
+    using namespace metal;\n\
+
+    typedef struct {\n\
+        float2 position;\n\
+        float3 color;\n\
+    } vertex_t;\n\
+
+    struct ColorInOut {\n\
+        float4 position [[position]];\n\
+        float4 color;\n\
+    };\n\
+
+    vertex ColorInOut vs(device vertex_t* vertex_array [[ buffer(0) ]],\n\
+                                      unsigned int vid [[ vertex_id ]])\n\
+    {\n\
+        ColorInOut out;\n\
+
+        out.position = float4(float2(vertex_array[vid].position), 0.0, 1.0);\n\
+        out.color = float4(float3(vertex_array[vid].color), 1.0);\n\
+
+        return out;\n\
+    }\n\
+
+    fragment float4 ps(ColorInOut in [[stage_in]])\n\
+    {\n\
+        return in.color;\n\
+    };\n\
+";
+
+fn main() {
+    let pool = unsafe { NSAutoreleasePool::new(cocoa::base::nil) };
+
+    let device = Device::system_default().expect("no device found");
+
+    let options = CompileOptions::new();
+    let library = device.new_library_with_source(PROGRAM, &options).unwrap();
+    let (vs, ps) = (
+        library.get_function("vs", None).unwrap(),
+        library.get_function("ps", None).unwrap(),
+    );
+
+    let vertex_desc = VertexDescriptor::new();
+
+    let desc = RenderPipelineDescriptor::new();
+    desc.set_vertex_function(Some(&vs));
+    desc.set_fragment_function(Some(&ps));
+    desc.set_vertex_descriptor(Some(vertex_desc));
+
+    println!("{:?}", desc);
+
+    #[cfg(features = "private")]
+    let _reflection = unsafe {
+        RenderPipelineReflection::new(
+            desc.serialize_vertex_data(),
+            desc.serialize_fragment_data(),
+            vertex_desc.serialize_descriptor(),
+            &device,
+            0x8,
+            0x0,
+        )
+    };
+
+    unsafe {
+        let () = msg_send![pool, release];
+    }
+}
diff --git a/third_party/rust/metal/examples/window/README.md b/third_party/rust/metal/examples/window/README.md
new file mode 100644
index 0000000000..62233be356
--- /dev/null
+++ b/third_party/rust/metal/examples/window/README.md
@@ -0,0 +1,11 @@
+## window
+
+Renders a spinning triangle to a [winit](https://github.com/rust-windowing/winit) window.
+
+![Screenshot of the final render](./screenshot.png)
+
+## To Run
+
+```
+cargo run --example window
+```
diff --git a/third_party/rust/metal/examples/window/main.rs b/third_party/rust/metal/examples/window/main.rs
new file mode 100644
index 0000000000..383933e3d3
--- /dev/null
+++ b/third_party/rust/metal/examples/window/main.rs
@@ -0,0 +1,178 @@
+// Copyright 2016 metal-rs developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+extern crate objc;
+
+use cocoa::{appkit::NSView, base::id as cocoa_id, foundation::NSRange};
+
+use metal::*;
+use objc::runtime::YES;
+use std::mem;
+use winit::platform::macos::WindowExtMacOS;
+
+use winit::{
+    event::{Event, WindowEvent},
+    event_loop::ControlFlow,
+};
+
+fn prepare_pipeline_state<'a>(device: &DeviceRef, library: &LibraryRef) -> RenderPipelineState {
+    let vert = library.get_function("triangle_vertex", None).unwrap();
+    let frag = library.get_function("triangle_fragment", None).unwrap();
+
+    let pipeline_state_descriptor = RenderPipelineDescriptor::new();
+    pipeline_state_descriptor.set_vertex_function(Some(&vert));
+    pipeline_state_descriptor.set_fragment_function(Some(&frag));
+    let attachment = pipeline_state_descriptor
+        .color_attachments()
+        .object_at(0)
+        .unwrap();
+    attachment.set_pixel_format(MTLPixelFormat::BGRA8Unorm);
+
+    attachment.set_blending_enabled(true);
+    attachment.set_rgb_blend_operation(metal::MTLBlendOperation::Add);
+    attachment.set_alpha_blend_operation(metal::MTLBlendOperation::Add);
+    attachment.set_source_rgb_blend_factor(metal::MTLBlendFactor::SourceAlpha);
+    attachment.set_source_alpha_blend_factor(metal::MTLBlendFactor::SourceAlpha);
+    attachment.set_destination_rgb_blend_factor(metal::MTLBlendFactor::OneMinusSourceAlpha);
+    attachment.set_destination_alpha_blend_factor(metal::MTLBlendFactor::OneMinusSourceAlpha);
+
+    device
+        .new_render_pipeline_state(&pipeline_state_descriptor)
+        .unwrap()
+}
+
+fn prepare_render_pass_descriptor(descriptor: &RenderPassDescriptorRef, texture: &TextureRef) {
+    //descriptor.color_attachments().set_object_at(0, MTLRenderPassColorAttachmentDescriptor::alloc());
+    //let color_attachment: MTLRenderPassColorAttachmentDescriptor = unsafe { msg_send![descriptor.color_attachments().0, _descriptorAtIndex:0] };//descriptor.color_attachments().object_at(0);
+    let color_attachment = descriptor.color_attachments().object_at(0).unwrap();
+
+    color_attachment.set_texture(Some(texture));
+    color_attachment.set_load_action(MTLLoadAction::Clear);
+    color_attachment.set_clear_color(MTLClearColor::new(0.5, 0.2, 0.2, 1.0));
+    color_attachment.set_store_action(MTLStoreAction::Store);
+}
+
+fn main() {
+    let events_loop = winit::event_loop::EventLoop::new();
+    let size = winit::dpi::LogicalSize::new(800, 600);
+
+    let window = winit::window::WindowBuilder::new()
+        .with_inner_size(size)
+        .with_title("Metal Window Example".to_string())
+        .build(&events_loop)
+        .unwrap();
+
+    let device = Device::system_default().expect("no device found");
+
+    let layer = CoreAnimationLayer::new();
+    layer.set_device(&device);
+    layer.set_pixel_format(MTLPixelFormat::BGRA8Unorm);
+    layer.set_presents_with_transaction(false);
+
+    unsafe {
+        let view = window.ns_view() as cocoa_id;
+        view.setWantsLayer(YES);
+        view.setLayer(mem::transmute(layer.as_ref()));
+    }
+
+    let draw_size = window.inner_size();
+    layer.set_drawable_size(CGSize::new(draw_size.width as f64, draw_size.height as f64));
+
+    let library_path = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"))
+        .join("examples/window/shaders.metallib");
+
+    let library = device.new_library_with_file(library_path).unwrap();
+    let pipeline_state = prepare_pipeline_state(&device, &library);
+    let command_queue = device.new_command_queue();
+    //let nc: () = msg_send![command_queue.0, setExecutionEnabled:true];
+
+    let vbuf = {
+        let vertex_data = [
+            0.0f32, 0.5, 1.0, 0.0, 0.0, -0.5, -0.5, 0.0, 1.0, 0.0, 0.5, 0.5, 0.0, 0.0, 1.0,
+        ];
+
+        device.new_buffer_with_data(
+            vertex_data.as_ptr() as *const _,
+            (vertex_data.len() * mem::size_of::<f32>()) as u64,
+            MTLResourceOptions::CPUCacheModeDefaultCache | MTLResourceOptions::StorageModeManaged,
+        )
+    };
+
+    let mut r = 0.0f32;
+
+    events_loop.run(move |event, _, control_flow| {
+        *control_flow = ControlFlow::Poll;
+
+        match event {
+            Event::WindowEvent { event, .. } => match event {
+                WindowEvent::CloseRequested => *control_flow = ControlFlow::Exit,
+                WindowEvent::Resized(size) => {
+                    layer.set_drawable_size(CGSize::new(size.width as f64, size.height as f64));
+                }
+                _ => (),
+            },
+            Event::MainEventsCleared => {
+                window.request_redraw();
+            }
+            Event::RedrawRequested(_) => {
+                let p = vbuf.contents();
+                let vertex_data = [
+                    0.0f32,
+                    0.5,
+                    1.0,
+                    0.0,
+                    0.0,
+                    -0.5 + (r.cos() / 2. + 0.5),
+                    -0.5,
+                    0.0,
+                    1.0,
+                    0.0,
+                    0.5 - (r.cos() / 2. + 0.5),
+                    -0.5,
+                    0.0,
+                    0.0,
+                    1.0,
+                ];
+
+                unsafe {
+                    std::ptr::copy(
+                        vertex_data.as_ptr(),
+                        p as *mut f32,
+                        (vertex_data.len() * mem::size_of::<f32>()) as usize,
+                    );
+                }
+
+                vbuf.did_modify_range(NSRange::new(
+                    0 as u64,
+                    (vertex_data.len() * mem::size_of::<f32>()) as u64,
+                ));
+
+                let drawable = match layer.next_drawable() {
+                    Some(drawable) => drawable,
+                    None => return,
+                };
+
+                let render_pass_descriptor = RenderPassDescriptor::new();
+
+                prepare_render_pass_descriptor(&render_pass_descriptor, drawable.texture());
+
+                let command_buffer = command_queue.new_command_buffer();
+                let encoder = command_buffer.new_render_command_encoder(&render_pass_descriptor);
+                encoder.set_render_pipeline_state(&pipeline_state);
+                encoder.set_vertex_buffer(0, Some(&vbuf), 0);
+                encoder.draw_primitives(MTLPrimitiveType::Triangle, 0, 3);
+                encoder.end_encoding();
+
+                command_buffer.present_drawable(&drawable);
+                command_buffer.commit();
+
+                r += 0.01f32;
+            }
+            _ => {}
+        }
+    });
+}
diff --git a/third_party/rust/metal/examples/window/screenshot.png b/third_party/rust/metal/examples/window/screenshot.png
new file mode 100644
index 0000000000..9f5eba8ccf
--- /dev/null
+++ b/third_party/rust/metal/examples/window/screenshot.png
diff --git a/third_party/rust/metal/examples/window/shaders.metal b/third_party/rust/metal/examples/window/shaders.metal
new file mode 100644
index 0000000000..3defda15f0
--- /dev/null
+++ b/third_party/rust/metal/examples/window/shaders.metal
@@ -0,0 +1,32 @@
+#include <metal_stdlib>
+
+using namespace metal;
+
+typedef struct {
+	packed_float2 position;
+	packed_float3 color;
+} vertex_t;
+
+struct ColorInOut {
+    float4 position [[position]];
+    float4 color;
+};
+
+// vertex shader function
+vertex ColorInOut triangle_vertex(const device vertex_t* vertex_array [[ buffer(0) ]],
+                                   unsigned int vid [[ vertex_id ]])
+{
+    ColorInOut out;
+
+    auto device const &v = vertex_array[vid];
+    out.position = float4(v.position.x, v.position.y, 0.0, 1.0);
+    out.color = float4(v.color.x, v.color.y, v.color.z, 0.2);
+
+    return out;
+}
+
+// fragment shader function
+fragment float4 triangle_fragment(ColorInOut in [[stage_in]])
+{
+    return in.color;
+};
diff --git a/third_party/rust/metal/examples/window/shaders.metallib b/third_party/rust/metal/examples/window/shaders.metallib
new file mode 100644
index 0000000000..a182b718fa
--- /dev/null
+++ b/third_party/rust/metal/examples/window/shaders.metallib
diff --git a/third_party/rust/metal/src/argument.rs b/third_party/rust/metal/src/argument.rs
new file mode 100644
index 0000000000..4eca3c1090
--- /dev/null
+++ b/third_party/rust/metal/src/argument.rs
@@ -0,0 +1,324 @@
+// Copyright 2017 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+use crate::{Array, MTLTextureType};
+
+use cocoa_foundation::foundation::NSUInteger;
+use objc::runtime::{NO, YES};
+
+#[repr(u64)]
+#[allow(non_camel_case_types)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+pub enum MTLDataType {
+    None = 0,
+
+    Struct = 1,
+    Array = 2,
+
+    Float = 3,
+    Float2 = 4,
+    Float3 = 5,
+    Float4 = 6,
+
+    Float2x2 = 7,
+    Float2x3 = 8,
+    Float2x4 = 9,
+
+    Float3x2 = 10,
+    Float3x3 = 11,
+    Float3x4 = 12,
+
+    Float4x2 = 13,
+    Float4x3 = 14,
+    Float4x4 = 15,
+
+    Half = 16,
+    Half2 = 17,
+    Half3 = 18,
+    Half4 = 19,
+
+    Half2x2 = 20,
+    Half2x3 = 21,
+    Half2x4 = 22,
+
+    Half3x2 = 23,
+    Half3x3 = 24,
+    Half3x4 = 25,
+
+    Half4x2 = 26,
+    Half4x3 = 27,
+    Half4x4 = 28,
+
+    Int = 29,
+    Int2 = 30,
+    Int3 = 31,
+    Int4 = 32,
+
+    UInt = 33,
+    UInt2 = 34,
+    UInt3 = 35,
+    UInt4 = 36,
+
+    Short = 37,
+    Short2 = 38,
+    Short3 = 39,
+    Short4 = 40,
+
+    UShort = 41,
+    UShort2 = 42,
+    UShort3 = 43,
+    UShort4 = 44,
+
+    Char = 45,
+    Char2 = 46,
+    Char3 = 47,
+    Char4 = 48,
+
+    UChar = 49,
+    UChar2 = 50,
+    UChar3 = 51,
+    UChar4 = 52,
+
+    Bool = 53,
+    Bool2 = 54,
+    Bool3 = 55,
+    Bool4 = 56,
+
+    Texture = 58,
+    Sampler = 59,
+    Pointer = 60,
+    R8Unorm = 62,
+    R8Snorm = 63,
+    R16Unorm = 64,
+    R16Snorm = 65,
+    RG8Unorm = 66,
+    RG8Snorm = 67,
+    RG16Unorm = 68,
+    RG16Snorm = 69,
+    RGBA8Unorm = 70,
+    RGBA8Unorm_sRGB = 71,
+    RGBA8Snorm = 72,
+    RGBA16Unorm = 73,
+    RGBA16Snorm = 74,
+    RGB10A2Unorm = 75,
+    RG11B10Float = 76,
+    RGB9E5Float = 77,
+}
+
+#[repr(u32)]
+#[allow(non_camel_case_types)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+pub enum MTLArgumentType {
+    Buffer = 0,
+    ThreadgroupMemory = 1,
+    Texture = 2,
+    Sampler = 3,
+    ImageblockData = 16,
+    Imageblock = 17,
+}
+
+#[repr(u32)]
+#[allow(non_camel_case_types)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+pub enum MTLArgumentAccess {
+    ReadOnly = 0,
+    ReadWrite = 1,
+    WriteOnly = 2,
+}
+
+pub enum MTLStructMember {}
+
+foreign_obj_type! {
+    type CType = MTLStructMember;
+    pub struct StructMember;
+    pub struct StructMemberRef;
+}
+
+impl StructMemberRef {
+    pub fn name(&self) -> &str {
+        unsafe {
+            let name = msg_send![self, name];
+            crate::nsstring_as_str(name)
+        }
+    }
+
+    pub fn offset(&self) -> NSUInteger {
+        unsafe { msg_send![self, offset] }
+    }
+
+    pub fn data_type(&self) -> MTLDataType {
+        unsafe { msg_send![self, dataType] }
+    }
+
+    pub fn struct_type(&self) -> MTLStructType {
+        unsafe { msg_send![self, structType] }
+    }
+
+    pub fn array_type(&self) -> MTLArrayType {
+        unsafe { msg_send![self, arrayType] }
+    }
+}
+
+pub enum MTLStructType {}
+
+foreign_obj_type! {
+    type CType = MTLStructType;
+    pub struct StructType;
+    pub struct StructTypeRef;
+}
+
+impl StructTypeRef {
+    pub fn members(&self) -> &Array<StructMember> {
+        unsafe { msg_send![self, members] }
+    }
+
+    pub fn member_from_name(&self, name: &str) -> Option<&StructMemberRef> {
+        let nsname = crate::nsstring_from_str(name);
+
+        unsafe { msg_send![self, memberByName: nsname] }
+    }
+}
+
+pub enum MTLArrayType {}
+
+foreign_obj_type! {
+    type CType = MTLArrayType;
+    pub struct ArrayType;
+    pub struct ArrayTypeRef;
+}
+
+impl ArrayTypeRef {
+    pub fn array_length(&self) -> NSUInteger {
+        unsafe { msg_send![self, arrayLength] }
+    }
+
+    pub fn stride(&self) -> NSUInteger {
+        unsafe { msg_send![self, stride] }
+    }
+
+    pub fn element_type(&self) -> MTLDataType {
+        unsafe { msg_send![self, elementType] }
+    }
+
+    pub fn element_struct_type(&self) -> MTLStructType {
+        unsafe { msg_send![self, elementStructType] }
+    }
+
+    pub fn element_array_type(&self) -> MTLArrayType {
+        unsafe { msg_send![self, elementArrayType] }
+    }
+}
+
+pub enum MTLArgument {}
+
+foreign_obj_type! {
+    type CType = MTLArgument;
+    pub struct Argument;
+    pub struct ArgumentRef;
+}
+
+impl ArgumentRef {
+    pub fn name(&self) -> &str {
+        unsafe {
+            let name = msg_send![self, name];
+            crate::nsstring_as_str(name)
+        }
+    }
+
+    pub fn type_(&self) -> MTLArgumentType {
+        unsafe { msg_send![self, type] }
+    }
+
+    pub fn access(&self) -> MTLArgumentAccess {
+        unsafe { msg_send![self, access] }
+    }
+
+    pub fn index(&self) -> NSUInteger {
+        unsafe { msg_send![self, index] }
+    }
+
+    pub fn is_active(&self) -> bool {
+        unsafe {
+            match msg_send![self, isActive] {
+                YES => true,
+                NO => false,
+                _ => unreachable!(),
+            }
+        }
+    }
+
+    pub fn buffer_alignment(&self) -> NSUInteger {
+        unsafe { msg_send![self, bufferAlignment] }
+    }
+
+    pub fn buffer_data_size(&self) -> NSUInteger {
+        unsafe { msg_send![self, bufferDataSize] }
+    }
+
+    pub fn buffer_data_type(&self) -> MTLDataType {
+        unsafe { msg_send![self, bufferDataType] }
+    }
+
+    pub fn buffer_struct_type(&self) -> &StructTypeRef {
+        unsafe { msg_send![self, bufferStructType] }
+    }
+
+    pub fn threadgroup_memory_alignment(&self) -> NSUInteger {
+        unsafe { msg_send![self, threadgroupMemoryAlignment] }
+    }
+
+    pub fn threadgroup_memory_data_size(&self) -> NSUInteger {
+        unsafe { msg_send![self, threadgroupMemoryDataSize] }
+    }
+
+    pub fn texture_type(&self) -> MTLTextureType {
+        unsafe { msg_send![self, textureType] }
+    }
+
+    pub fn texture_data_type(&self) -> MTLDataType {
+        unsafe { msg_send![self, textureDataType] }
+    }
+}
+
+pub enum MTLArgumentDescriptor {}
+
+foreign_obj_type! {
+    type CType = MTLArgumentDescriptor;
+    pub struct ArgumentDescriptor;
+    pub struct ArgumentDescriptorRef;
+}
+
+impl ArgumentDescriptor {
+    pub fn new<'a>() -> &'a ArgumentDescriptorRef {
+        unsafe {
+            let class = class!(MTLArgumentDescriptor);
+            msg_send![class, argumentDescriptor]
+        }
+    }
+}
+
+impl ArgumentDescriptorRef {
+    pub fn set_data_type(&self, ty: MTLDataType) {
+        unsafe { msg_send![self, setDataType: ty] }
+    }
+
+    pub fn set_index(&self, index: NSUInteger) {
+        unsafe { msg_send![self, setIndex: index] }
+    }
+
+    pub fn set_access(&self, access: MTLArgumentAccess) {
+        unsafe { msg_send![self, setAccess: access] }
+    }
+
+    pub fn set_array_length(&self, length: NSUInteger) {
+        unsafe { msg_send![self, setArrayLength: length] }
+    }
+
+    pub fn set_texture_type(&self, ty: MTLTextureType) {
+        unsafe { msg_send![self, setTextureType: ty] }
+    }
+}
diff --git a/third_party/rust/metal/src/buffer.rs b/third_party/rust/metal/src/buffer.rs
new file mode 100644
index 0000000000..885549f6f8
--- /dev/null
+++ b/third_party/rust/metal/src/buffer.rs
@@ -0,0 +1,55 @@
+// Copyright 2016 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+use super::*;
+
+use cocoa_foundation::foundation::NSRange;
+
+pub enum MTLBuffer {}
+
+foreign_obj_type! {
+    type CType = MTLBuffer;
+    pub struct Buffer;
+    pub struct BufferRef;
+    type ParentType = ResourceRef;
+}
+
+impl BufferRef {
+    pub fn length(&self) -> u64 {
+        unsafe { msg_send![self, length] }
+    }
+
+    pub fn contents(&self) -> *mut std::ffi::c_void {
+        unsafe { msg_send![self, contents] }
+    }
+
+    pub fn did_modify_range(&self, range: NSRange) {
+        unsafe { msg_send![self, didModifyRange: range] }
+    }
+
+    pub fn new_texture_from_contents(
+        &self,
+        descriptor: &TextureDescriptorRef,
+        offset: u64,
+        stride: u64,
+    ) -> Texture {
+        unsafe {
+            msg_send![self,
+                newTextureWithDescriptor:descriptor
+                offset:offset
+                bytesPerRow:stride
+            ]
+        }
+    }
+
+    pub fn add_debug_marker(&self, name: &str, range: NSRange) {
+        unsafe {
+            let name = crate::nsstring_from_str(name);
+            msg_send![self, addDebugMarker:name range:range]
+        }
+    }
+}
diff --git a/third_party/rust/metal/src/capturedescriptor.rs b/third_party/rust/metal/src/capturedescriptor.rs
new file mode 100644
index 0000000000..ac36a92504
--- /dev/null
+++ b/third_party/rust/metal/src/capturedescriptor.rs
@@ -0,0 +1,79 @@
+// Copyright 2020 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+use super::*;
+
+use std::path::Path;
+
+/// https://developer.apple.com/documentation/metal/mtlcapturedestination?language=objc
+#[repr(u64)]
+#[allow(non_camel_case_types)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+pub enum MTLCaptureDestination {
+    DeveloperTools = 1,
+    GpuTraceDocument = 2,
+}
+
+/// https://developer.apple.com/documentation/metal/mtlcapturedescriptor
+pub enum MTLCaptureDescriptor {}
+
+foreign_obj_type! {
+    type CType = MTLCaptureDescriptor;
+    pub struct CaptureDescriptor;
+    pub struct CaptureDescriptorRef;
+}
+
+impl CaptureDescriptor {
+    pub fn new() -> CaptureDescriptor {
+        unsafe {
+            let class = class!(MTLCaptureDescriptor);
+            msg_send![class, new]
+        }
+    }
+}
+
+impl CaptureDescriptorRef {
+    /// https://developer.apple.com/documentation/metal/mtlcapturedescriptor/3237248-captureobject
+    pub fn set_capture_device(&self, device: &DeviceRef) {
+        unsafe { msg_send![self, setCaptureObject: device] }
+    }
+
+    /// https://developer.apple.com/documentation/metal/mtlcapturedescriptor/3237248-captureobject
+    pub fn set_capture_scope(&self, scope: &CaptureScopeRef) {
+        unsafe { msg_send![self, setCaptureObject: scope] }
+    }
+
+    /// https://developer.apple.com/documentation/metal/mtlcapturedescriptor/3237248-captureobject
+    pub fn set_capture_command_queue(&self, command_queue: &CommandQueueRef) {
+        unsafe { msg_send![self, setCaptureObject: command_queue] }
+    }
+
+    /// https://developer.apple.com/documentation/metal/mtlcapturedescriptor/3237250-outputurl
+    pub fn output_url(&self) -> &Path {
+        let output_url = unsafe { msg_send![self, outputURL] };
+        let output_url = nsstring_as_str(output_url);
+
+        Path::new(output_url)
+    }
+
+    /// https://developer.apple.com/documentation/metal/mtlcapturedescriptor/3237250-outputurl
+    pub fn set_output_url<P: AsRef<Path>>(&self, output_url: P) {
+        let output_url = nsstring_from_str(output_url.as_ref().to_str().unwrap());
+
+        unsafe { msg_send![self, setOutputURL: output_url] }
+    }
+
+    /// https://developer.apple.com/documentation/metal/mtlcapturedescriptor?language=objc
+    pub fn destination(&self) -> MTLCaptureDestination {
+        unsafe { msg_send![self, destination] }
+    }
+
+    /// https://developer.apple.com/documentation/metal/mtlcapturedescriptor?language=objc
+    pub fn set_destination(&self, destination: MTLCaptureDestination) {
+        unsafe { msg_send![self, setDestination: destination] }
+    }
+}
diff --git a/third_party/rust/metal/src/capturemanager.rs b/third_party/rust/metal/src/capturemanager.rs
new file mode 100644
index 0000000000..95180c4239
--- /dev/null
+++ b/third_party/rust/metal/src/capturemanager.rs
@@ -0,0 +1,107 @@
+// Copyright 2018 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+use super::*;
+use std::ffi::CStr;
+
+pub enum MTLCaptureScope {}
+
+foreign_obj_type! {
+    type CType = MTLCaptureScope;
+    pub struct CaptureScope;
+    pub struct CaptureScopeRef;
+}
+
+impl CaptureScopeRef {
+    pub fn begin_scope(&self) {
+        unsafe { msg_send![self, beginScope] }
+    }
+
+    pub fn end_scope(&self) {
+        unsafe { msg_send![self, endScope] }
+    }
+
+    pub fn label(&self) -> &str {
+        unsafe {
+            let label = msg_send![self, label];
+            crate::nsstring_as_str(label)
+        }
+    }
+}
+
+pub enum MTLCaptureManager {}
+
+foreign_obj_type! {
+    type CType = MTLCaptureManager;
+    pub struct CaptureManager;
+    pub struct CaptureManagerRef;
+}
+
+impl CaptureManager {
+    pub fn shared<'a>() -> &'a CaptureManagerRef {
+        unsafe {
+            let class = class!(MTLCaptureManager);
+            msg_send![class, sharedCaptureManager]
+        }
+    }
+}
+
+impl CaptureManagerRef {
+    pub fn new_capture_scope_with_device(&self, device: &DeviceRef) -> CaptureScope {
+        unsafe { msg_send![self, newCaptureScopeWithDevice: device] }
+    }
+
+    pub fn new_capture_scope_with_command_queue(
+        &self,
+        command_queue: &CommandQueueRef,
+    ) -> CaptureScope {
+        unsafe { msg_send![self, newCaptureScopeWithCommandQueue: command_queue] }
+    }
+
+    pub fn default_capture_scope(&self) -> Option<&CaptureScopeRef> {
+        unsafe { msg_send![self, defaultCaptureScope] }
+    }
+
+    pub fn set_default_capture_scope(&self, scope: &CaptureScopeRef) {
+        unsafe { msg_send![self, setDefaultCaptureScope: scope] }
+    }
+
+    /// https://developer.apple.com/documentation/metal/mtlcapturemanager/3237259-startcapture
+    pub fn start_capture(&self, descriptor: &CaptureDescriptorRef) -> Result<(), String> {
+        unsafe {
+            try_objc! { err =>
+                msg_send![self, startCaptureWithDescriptor: descriptor
+                                error: &mut err]
+            }
+        }
+    }
+
+    pub fn start_capture_with_device(&self, device: &DeviceRef) {
+        unsafe { msg_send![self, startCaptureWithDevice: device] }
+    }
+
+    pub fn start_capture_with_command_queue(&self, command_queue: &CommandQueueRef) {
+        unsafe { msg_send![self, startCaptureWithCommandQueue: command_queue] }
+    }
+
+    pub fn start_capture_with_scope(&self, scope: &CaptureScopeRef) {
+        unsafe { msg_send![self, startCaptureWithScope: scope] }
+    }
+
+    pub fn stop_capture(&self) {
+        unsafe { msg_send![self, stopCapture] }
+    }
+
+    pub fn is_capturing(&self) -> bool {
+        unsafe { msg_send![self, isCapturing] }
+    }
+
+    /// https://developer.apple.com/documentation/metal/mtlcapturemanager/3237260-supportsdestination?language=objc
+    pub fn supports_destination(&self, destination: MTLCaptureDestination) -> bool {
+        unsafe { msg_send![self, supportsDestination: destination] }
+    }
+}
diff --git a/third_party/rust/metal/src/commandbuffer.rs b/third_party/rust/metal/src/commandbuffer.rs
new file mode 100644
index 0000000000..a21c5f1779
--- /dev/null
+++ b/third_party/rust/metal/src/commandbuffer.rs
@@ -0,0 +1,129 @@
+// Copyright 2016 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+use super::*;
+
+use block::Block;
+
+#[repr(u32)]
+#[allow(non_camel_case_types)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+pub enum MTLCommandBufferStatus {
+    NotEnqueued = 0,
+    Enqueued = 1,
+    Committed = 2,
+    Scheduled = 3,
+    Completed = 4,
+    Error = 5,
+}
+
+#[repr(u32)]
+#[allow(non_camel_case_types)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+pub enum MTLCommandBufferError {
+    None = 0,
+    Internal = 1,
+    Timeout = 2,
+    PageFault = 3,
+    Blacklisted = 4,
+    NotPermitted = 7,
+    OutOfMemory = 8,
+    InvalidResource = 9,
+    Memoryless = 10,
+    DeviceRemoved = 11,
+}
+
+#[repr(u32)]
+#[allow(non_camel_case_types)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+pub enum MTLDispatchType {
+    Serial = 0,
+    Concurrent = 1,
+}
+
+type CommandBufferHandler<'a> = Block<(&'a CommandBufferRef,), ()>;
+
+pub enum MTLCommandBuffer {}
+
+foreign_obj_type! {
+    type CType = MTLCommandBuffer;
+    pub struct CommandBuffer;
+    pub struct CommandBufferRef;
+}
+
+impl CommandBufferRef {
+    pub fn label(&self) -> &str {
+        unsafe {
+            let label = msg_send![self, label];
+            crate::nsstring_as_str(label)
+        }
+    }
+
+    pub fn set_label(&self, label: &str) {
+        unsafe {
+            let nslabel = crate::nsstring_from_str(label);
+            let () = msg_send![self, setLabel: nslabel];
+        }
+    }
+
+    pub fn enqueue(&self) {
+        unsafe { msg_send![self, enqueue] }
+    }
+
+    pub fn commit(&self) {
+        unsafe { msg_send![self, commit] }
+    }
+
+    pub fn status(&self) -> MTLCommandBufferStatus {
+        unsafe { msg_send![self, status] }
+    }
+
+    pub fn present_drawable(&self, drawable: &DrawableRef) {
+        unsafe { msg_send![self, presentDrawable: drawable] }
+    }
+
+    pub fn wait_until_completed(&self) {
+        unsafe { msg_send![self, waitUntilCompleted] }
+    }
+
+    pub fn wait_until_scheduled(&self) {
+        unsafe { msg_send![self, waitUntilScheduled] }
+    }
+
+    pub fn add_completed_handler(&self, block: &CommandBufferHandler) {
+        unsafe { msg_send![self, addCompletedHandler: block] }
+    }
+
+    pub fn new_blit_command_encoder(&self) -> &BlitCommandEncoderRef {
+        unsafe { msg_send![self, blitCommandEncoder] }
+    }
+
+    pub fn new_compute_command_encoder(&self) -> &ComputeCommandEncoderRef {
+        unsafe { msg_send![self, computeCommandEncoder] }
+    }
+
+    pub fn new_render_command_encoder(
+        &self,
+        descriptor: &RenderPassDescriptorRef,
+    ) -> &RenderCommandEncoderRef {
+        unsafe { msg_send![self, renderCommandEncoderWithDescriptor: descriptor] }
+    }
+
+    pub fn new_parallel_render_command_encoder(
+        &self,
+        descriptor: &RenderPassDescriptorRef,
+    ) -> &ParallelRenderCommandEncoderRef {
+        unsafe { msg_send![self, parallelRenderCommandEncoderWithDescriptor: descriptor] }
+    }
+
+    pub fn compute_command_encoder_with_dispatch_type(
+        &self,
+        ty: MTLDispatchType,
+    ) -> &ComputeCommandEncoderRef {
+        unsafe { msg_send![self, computeCommandEncoderWithDispatchType: ty] }
+    }
+}
diff --git a/third_party/rust/metal/src/commandqueue.rs b/third_party/rust/metal/src/commandqueue.rs
new file mode 100644
index 0000000000..470d8dbe93
--- /dev/null
+++ b/third_party/rust/metal/src/commandqueue.rs
@@ -0,0 +1,44 @@
+// Copyright 2016 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+use super::*;
+
+pub enum MTLCommandQueue {}
+
+foreign_obj_type! {
+    type CType = MTLCommandQueue;
+    pub struct CommandQueue;
+    pub struct CommandQueueRef;
+}
+
+impl CommandQueueRef {
+    pub fn label(&self) -> &str {
+        unsafe {
+            let label = msg_send![self, label];
+            crate::nsstring_as_str(label)
+        }
+    }
+
+    pub fn set_label(&self, label: &str) {
+        unsafe {
+            let nslabel = crate::nsstring_from_str(label);
+            let () = msg_send![self, setLabel: nslabel];
+        }
+    }
+
+    pub fn new_command_buffer(&self) -> &CommandBufferRef {
+        unsafe { msg_send![self, commandBuffer] }
+    }
+
+    pub fn new_command_buffer_with_unretained_references(&self) -> &CommandBufferRef {
+        unsafe { msg_send![self, commandBufferWithUnretainedReferences] }
+    }
+
+    pub fn device(&self) -> &DeviceRef {
+        unsafe { msg_send![self, device] }
+    }
+}
diff --git a/third_party/rust/metal/src/constants.rs b/third_party/rust/metal/src/constants.rs
new file mode 100644
index 0000000000..b6765a04cd
--- /dev/null
+++ b/third_party/rust/metal/src/constants.rs
@@ -0,0 +1,137 @@
+// Copyright 2016 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+#[repr(u64)]
+#[allow(non_camel_case_types)]
+#[derive(Debug, Copy, Clone, Hash, PartialEq, Eq)]
+pub enum MTLPixelFormat {
+    Invalid = 0,
+    A8Unorm = 1,
+    R8Unorm = 10,
+    R8Unorm_sRGB = 11,
+    R8Snorm = 12,
+    R8Uint = 13,
+    R8Sint = 14,
+    R16Unorm = 20,
+    R16Snorm = 22,
+    R16Uint = 23,
+    R16Sint = 24,
+    R16Float = 25,
+    RG8Unorm = 30,
+    RG8Unorm_sRGB = 31,
+    RG8Snorm = 32,
+    RG8Uint = 33,
+    RG8Sint = 34,
+    B5G6R5Unorm = 40,
+    A1BGR5Unorm = 41,
+    ABGR4Unorm = 42,
+    BGR5A1Unorm = 43,
+    R32Uint = 53,
+    R32Sint = 54,
+    R32Float = 55,
+    RG16Unorm = 60,
+    RG16Snorm = 62,
+    RG16Uint = 63,
+    RG16Sint = 64,
+    RG16Float = 65,
+    RGBA8Unorm = 70,
+    RGBA8Unorm_sRGB = 71,
+    RGBA8Snorm = 72,
+    RGBA8Uint = 73,
+    RGBA8Sint = 74,
+    BGRA8Unorm = 80,
+    BGRA8Unorm_sRGB = 81,
+    RGB10A2Unorm = 90,
+    RGB10A2Uint = 91,
+    RG11B10Float = 92,
+    RGB9E5Float = 93,
+    BGR10A2Unorm = 94,
+    RG32Uint = 103,
+    RG32Sint = 104,
+    RG32Float = 105,
+    RGBA16Unorm = 110,
+    RGBA16Snorm = 112,
+    RGBA16Uint = 113,
+    RGBA16Sint = 114,
+    RGBA16Float = 115,
+    RGBA32Uint = 123,
+    RGBA32Sint = 124,
+    RGBA32Float = 125,
+    BC1_RGBA = 130,
+    BC1_RGBA_sRGB = 131,
+    BC2_RGBA = 132,
+    BC2_RGBA_sRGB = 133,
+    BC3_RGBA = 134,
+    BC3_RGBA_sRGB = 135,
+    BC4_RUnorm = 140,
+    BC4_RSnorm = 141,
+    BC5_RGUnorm = 142,
+    BC5_RGSnorm = 143,
+    BC6H_RGBFloat = 150,
+    BC6H_RGBUfloat = 151,
+    BC7_RGBAUnorm = 152,
+    BC7_RGBAUnorm_sRGB = 153,
+    PVRTC_RGB_2BPP = 160,
+    PVRTC_RGB_2BPP_sRGB = 161,
+    PVRTC_RGB_4BPP = 162,
+    PVRTC_RGB_4BPP_sRGB = 163,
+    PVRTC_RGBA_2BPP = 164,
+    PVRTC_RGBA_2BPP_sRGB = 165,
+    PVRTC_RGBA_4BPP = 166,
+    PVRTC_RGBA_4BPP_sRGB = 167,
+    EAC_R11Unorm = 170,
+    EAC_R11Snorm = 172,
+    EAC_RG11Unorm = 174,
+    EAC_RG11Snorm = 176,
+    EAC_RGBA8 = 178,
+    EAC_RGBA8_sRGB = 179,
+    ETC2_RGB8 = 180,
+    ETC2_RGB8_sRGB = 181,
+    ETC2_RGB8A1 = 182,
+    ETC2_RGB8A1_sRGB = 183,
+    ASTC_4x4_sRGB = 186,
+    ASTC_5x4_sRGB = 187,
+    ASTC_5x5_sRGB = 188,
+    ASTC_6x5_sRGB = 189,
+    ASTC_6x6_sRGB = 190,
+    ASTC_8x5_sRGB = 192,
+    ASTC_8x6_sRGB = 193,
+    ASTC_8x8_sRGB = 194,
+    ASTC_10x5_sRGB = 195,
+    ASTC_10x6_sRGB = 196,
+    ASTC_10x8_sRGB = 197,
+    ASTC_10x10_sRGB = 198,
+    ASTC_12x10_sRGB = 199,
+    ASTC_12x12_sRGB = 200,
+    ASTC_4x4_LDR = 204,
+    ASTC_5x4_LDR = 205,
+    ASTC_5x5_LDR = 206,
+    ASTC_6x5_LDR = 207,
+    ASTC_6x6_LDR = 208,
+    ASTC_8x5_LDR = 210,
+    ASTC_8x6_LDR = 211,
+    ASTC_8x8_LDR = 212,
+    ASTC_10x5_LDR = 213,
+    ASTC_10x6_LDR = 214,
+    ASTC_10x8_LDR = 215,
+    ASTC_10x10_LDR = 216,
+    ASTC_12x10_LDR = 217,
+    ASTC_12x12_LDR = 218,
+    GBGR422 = 240,
+    BGRG422 = 241,
+    Depth16Unorm = 250,
+    Depth32Float = 252,
+    Stencil8 = 253,
+    Depth24Unorm_Stencil8 = 255,
+    Depth32Float_Stencil8 = 260,
+    X32_Stencil8 = 261,
+    X24_Stencil8 = 262,
+    BGRA10_XR = 552,
+    BGRA10_XR_SRGB = 553,
+    BGR10_XR = 554,
+    BGR10_XR_SRGB = 555,
+}
diff --git a/third_party/rust/metal/src/depthstencil.rs b/third_party/rust/metal/src/depthstencil.rs
new file mode 100644
index 0000000000..e00e68a9cd
--- /dev/null
+++ b/third_party/rust/metal/src/depthstencil.rs
@@ -0,0 +1,166 @@
+// Copyright 2016 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+use objc::runtime::{NO, YES};
+
+#[repr(u64)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+pub enum MTLCompareFunction {
+    Never = 0,
+    Less = 1,
+    Equal = 2,
+    LessEqual = 3,
+    Greater = 4,
+    NotEqual = 5,
+    GreaterEqual = 6,
+    Always = 7,
+}
+
+#[repr(u64)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+pub enum MTLStencilOperation {
+    Keep = 0,
+    Zero = 1,
+    Replace = 2,
+    IncrementClamp = 3,
+    DecrementClamp = 4,
+    Invert = 5,
+    IncrementWrap = 6,
+    DecrementWrap = 7,
+}
+
+pub enum MTLStencilDescriptor {}
+
+foreign_obj_type! {
+    type CType = MTLStencilDescriptor;
+    pub struct StencilDescriptor;
+    pub struct StencilDescriptorRef;
+}
+
+impl StencilDescriptor {
+    pub fn new() -> Self {
+        unsafe {
+            let class = class!(MTLStencilDescriptor);
+            msg_send![class, new]
+        }
+    }
+}
+
+impl StencilDescriptorRef {
+    pub fn stencil_compare_function(&self) -> MTLCompareFunction {
+        unsafe { msg_send![self, stencilCompareFunction] }
+    }
+
+    pub fn set_stencil_compare_function(&self, func: MTLCompareFunction) {
+        unsafe { msg_send![self, setStencilCompareFunction: func] }
+    }
+
+    pub fn stencil_failure_operation(&self) -> MTLStencilOperation {
+        unsafe { msg_send![self, stencilFailureOperation] }
+    }
+
+    pub fn set_stencil_failure_operation(&self, operation: MTLStencilOperation) {
+        unsafe { msg_send![self, setStencilFailureOperation: operation] }
+    }
+
+    pub fn depth_failure_operation(&self) -> MTLStencilOperation {
+        unsafe { msg_send![self, depthFailureOperation] }
+    }
+
+    pub fn set_depth_failure_operation(&self, operation: MTLStencilOperation) {
+        unsafe { msg_send![self, setDepthFailureOperation: operation] }
+    }
+
+    pub fn depth_stencil_pass_operation(&self) -> MTLStencilOperation {
+        unsafe { msg_send![self, depthStencilPassOperation] }
+    }
+
+    pub fn set_depth_stencil_pass_operation(&self, operation: MTLStencilOperation) {
+        unsafe { msg_send![self, setDepthStencilPassOperation: operation] }
+    }
+
+    pub fn read_mask(&self) -> u32 {
+        unsafe { msg_send![self, readMask] }
+    }
+
+    pub fn set_read_mask(&self, mask: u32) {
+        unsafe { msg_send![self, setReadMask: mask] }
+    }
+
+    pub fn write_mask(&self) -> u32 {
+        unsafe { msg_send![self, writeMask] }
+    }
+
+    pub fn set_write_mask(&self, mask: u32) {
+        unsafe { msg_send![self, setWriteMask: mask] }
+    }
+}
+
+pub enum MTLDepthStencilDescriptor {}
+
+foreign_obj_type! {
+    type CType = MTLDepthStencilDescriptor;
+    pub struct DepthStencilDescriptor;
+    pub struct DepthStencilDescriptorRef;
+}
+
+impl DepthStencilDescriptor {
+    pub fn new() -> Self {
+        unsafe {
+            let class = class!(MTLDepthStencilDescriptor);
+            msg_send![class, new]
+        }
+    }
+}
+
+impl DepthStencilDescriptorRef {
+    pub fn depth_compare_function(&self) -> MTLCompareFunction {
+        unsafe { msg_send![self, depthCompareFunction] }
+    }
+
+    pub fn set_depth_compare_function(&self, func: MTLCompareFunction) {
+        unsafe { msg_send![self, setDepthCompareFunction: func] }
+    }
+
+    pub fn depth_write_enabled(&self) -> bool {
+        unsafe {
+            match msg_send![self, isDepthWriteEnabled] {
+                YES => true,
+                NO => false,
+                _ => unreachable!(),
+            }
+        }
+    }
+
+    pub fn set_depth_write_enabled(&self, enabled: bool) {
+        unsafe { msg_send![self, setDepthWriteEnabled: enabled] }
+    }
+
+    pub fn front_face_stencil(&self) -> Option<&StencilDescriptorRef> {
+        unsafe { msg_send![self, frontFaceStencil] }
+    }
+
+    pub fn set_front_face_stencil(&self, descriptor: Option<&StencilDescriptorRef>) {
+        unsafe { msg_send![self, setFrontFaceStencil: descriptor] }
+    }
+
+    pub fn back_face_stencil(&self) -> Option<&StencilDescriptorRef> {
+        unsafe { msg_send![self, backFaceStencil] }
+    }
+
+    pub fn set_back_face_stencil(&self, descriptor: Option<&StencilDescriptorRef>) {
+        unsafe { msg_send![self, setBackFaceStencil: descriptor] }
+    }
+}
+
+pub enum MTLDepthStencilState {}
+
+foreign_obj_type! {
+    type CType = MTLDepthStencilState;
+    pub struct DepthStencilState;
+    pub struct DepthStencilStateRef;
+}
diff --git a/third_party/rust/metal/src/device.rs b/third_party/rust/metal/src/device.rs
new file mode 100644
index 0000000000..53326511a2
--- /dev/null
+++ b/third_party/rust/metal/src/device.rs
@@ -0,0 +1,1753 @@
+// Copyright 2017 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+use block::{Block, ConcreteBlock};
+use cocoa_foundation::base::id;
+use cocoa_foundation::foundation::NSUInteger;
+use foreign_types::ForeignType;
+use objc::runtime::{Object, BOOL, NO, YES};
+
+use super::*;
+
+use std::ffi::CStr;
+use std::path::Path;
+use std::ptr;
+
+#[allow(non_camel_case_types)]
+#[repr(u64)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+pub enum MTLFeatureSet {
+    iOS_GPUFamily1_v1 = 0,
+    iOS_GPUFamily2_v1 = 1,
+    iOS_GPUFamily1_v2 = 2,
+    iOS_GPUFamily2_v2 = 3,
+    iOS_GPUFamily3_v1 = 4,
+    iOS_GPUFamily1_v3 = 5,
+    iOS_GPUFamily2_v3 = 6,
+    iOS_GPUFamily3_v2 = 7,
+    iOS_GPUFamily1_v4 = 8,
+    iOS_GPUFamily2_v4 = 9,
+    iOS_GPUFamily3_v3 = 10,
+    iOS_GPUFamily4_v1 = 11,
+    iOS_GPUFamily1_v5 = 12,
+    iOS_GPUFamily2_v5 = 13,
+    iOS_GPUFamily3_v4 = 14,
+    iOS_GPUFamily4_v2 = 15,
+    iOS_GPUFamily5_v1 = 16,
+
+    tvOS_GPUFamily1_v1 = 30000,
+    tvOS_GPUFamily1_v2 = 30001,
+    tvOS_GPUFamily1_v3 = 30002,
+    tvOS_GPUFamily2_v1 = 30003,
+    tvOS_GPUFamily1_v4 = 30004,
+    tvOS_GPUFamily2_v2 = 30005,
+
+    macOS_GPUFamily1_v1 = 10000,
+    macOS_GPUFamily1_v2 = 10001,
+    //macOS_ReadWriteTextureTier2 = 10002, TODO: Uncomment when feature tables updated
+    macOS_GPUFamily1_v3 = 10003,
+    macOS_GPUFamily1_v4 = 10004,
+    macOS_GPUFamily2_v1 = 10005,
+}
+
+bitflags! {
+    pub struct PixelFormatCapabilities: u32 {
+        const Filter = 1 << 0;
+        const Write = 1 << 1;
+        const Color = 1 << 2;
+        const Blend = 1 << 3;
+        const Msaa = 1 << 4;
+        const Resolve = 1 << 5;
+    }
+}
+
+#[allow(non_camel_case_types)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+enum OS {
+    iOS,
+    tvOS,
+    macOS,
+}
+
+const KB: u32 = 1024;
+const MB: u32 = 1024 * KB;
+const GB: u32 = 1024 * MB;
+
+impl MTLFeatureSet {
+    fn os(&self) -> OS {
+        let value = *self as u64;
+        if value < 10_000 {
+            OS::iOS
+        } else if value < 20_000 {
+            OS::macOS
+        } else if value >= 30_000 || value < 40_000 {
+            OS::tvOS
+        } else {
+            unreachable!()
+        }
+    }
+
+    // returns the minor version on macos
+    fn os_version(&self) -> u32 {
+        use MTLFeatureSet::*;
+        match self {
+            iOS_GPUFamily1_v1 | iOS_GPUFamily2_v1 => 8,
+            iOS_GPUFamily1_v2 | iOS_GPUFamily2_v2 | iOS_GPUFamily3_v1 => 9,
+            iOS_GPUFamily1_v3 | iOS_GPUFamily2_v3 | iOS_GPUFamily3_v2 => 10,
+            iOS_GPUFamily1_v4 | iOS_GPUFamily2_v4 | iOS_GPUFamily3_v3 | iOS_GPUFamily4_v1 => 11,
+            iOS_GPUFamily1_v5 | iOS_GPUFamily2_v5 | iOS_GPUFamily3_v4 | iOS_GPUFamily4_v2
+            | iOS_GPUFamily5_v1 => 12,
+            tvOS_GPUFamily1_v1 => 9,
+            tvOS_GPUFamily1_v2 => 10,
+            tvOS_GPUFamily1_v3 | tvOS_GPUFamily2_v1 => 11,
+            tvOS_GPUFamily1_v4 | tvOS_GPUFamily2_v2 => 12,
+            macOS_GPUFamily1_v1 => 11,
+            macOS_GPUFamily1_v2 => 12,
+            macOS_GPUFamily1_v3 => 13,
+            macOS_GPUFamily1_v4 | macOS_GPUFamily2_v1 => 14,
+        }
+    }
+
+    fn gpu_family(&self) -> u32 {
+        use MTLFeatureSet::*;
+        match self {
+            iOS_GPUFamily1_v1 | iOS_GPUFamily1_v2 | iOS_GPUFamily1_v3 | iOS_GPUFamily1_v4
+            | iOS_GPUFamily1_v5 | tvOS_GPUFamily1_v1 | tvOS_GPUFamily1_v2 | tvOS_GPUFamily1_v3
+            | tvOS_GPUFamily1_v4 | macOS_GPUFamily1_v1 | macOS_GPUFamily1_v2
+            | macOS_GPUFamily1_v3 | macOS_GPUFamily1_v4 => 1,
+            iOS_GPUFamily2_v1 | iOS_GPUFamily2_v2 | iOS_GPUFamily2_v3 | iOS_GPUFamily2_v4
+            | iOS_GPUFamily2_v5 | tvOS_GPUFamily2_v1 | tvOS_GPUFamily2_v2 | macOS_GPUFamily2_v1 => {
+                2
+            }
+            iOS_GPUFamily3_v1 | iOS_GPUFamily3_v2 | iOS_GPUFamily3_v3 | iOS_GPUFamily3_v4 => 3,
+            iOS_GPUFamily4_v1 | iOS_GPUFamily4_v2 => 4,
+            iOS_GPUFamily5_v1 => 5,
+        }
+    }
+
+    fn version(&self) -> u32 {
+        use MTLFeatureSet::*;
+        match self {
+            iOS_GPUFamily1_v1 | iOS_GPUFamily2_v1 | iOS_GPUFamily3_v1 | iOS_GPUFamily4_v1
+            | iOS_GPUFamily5_v1 | macOS_GPUFamily1_v1 | macOS_GPUFamily2_v1
+            | tvOS_GPUFamily1_v1 | tvOS_GPUFamily2_v1 => 1,
+            iOS_GPUFamily1_v2 | iOS_GPUFamily2_v2 | iOS_GPUFamily3_v2 | iOS_GPUFamily4_v2
+            | macOS_GPUFamily1_v2 | tvOS_GPUFamily1_v2 | tvOS_GPUFamily2_v2 => 2,
+            iOS_GPUFamily1_v3 | iOS_GPUFamily2_v3 | iOS_GPUFamily3_v3 | macOS_GPUFamily1_v3
+            | tvOS_GPUFamily1_v3 => 3,
+            iOS_GPUFamily1_v4 | iOS_GPUFamily2_v4 | iOS_GPUFamily3_v4 | tvOS_GPUFamily1_v4
+            | macOS_GPUFamily1_v4 => 4,
+            iOS_GPUFamily1_v5 | iOS_GPUFamily2_v5 => 5,
+        }
+    }
+
+    pub fn supports_metal_kit(&self) -> bool {
+        true
+    }
+
+    pub fn supports_metal_performance_shaders(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.gpu_family() >= 2,
+            OS::tvOS => true,
+            OS::macOS => self.os_version() >= 13,
+        }
+    }
+
+    pub fn supports_programmable_blending(&self) -> bool {
+        self.os() != OS::macOS
+    }
+
+    pub fn supports_pvrtc_pixel_formats(&self) -> bool {
+        self.os() != OS::macOS
+    }
+
+    pub fn supports_eac_etc_pixel_formats(&self) -> bool {
+        self.os() != OS::macOS
+    }
+
+    pub fn supports_astc_pixel_formats(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.gpu_family() >= 2,
+            OS::tvOS => true,
+            OS::macOS => false,
+        }
+    }
+
+    pub fn supports_linear_textures(&self) -> bool {
+        self.os() != OS::macOS || self.os_version() >= 13
+    }
+
+    pub fn supports_bc_pixel_formats(&self) -> bool {
+        self.os() == OS::macOS
+    }
+
+    pub fn supports_msaa_depth_resolve(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.gpu_family() >= 3,
+            OS::tvOS => self.gpu_family() >= 2,
+            OS::macOS => false,
+        }
+    }
+
+    pub fn supports_counting_occlusion_query(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.gpu_family() >= 3,
+            OS::tvOS => self.gpu_family() >= 2,
+            OS::macOS => true,
+        }
+    }
+
+    pub fn supports_base_vertex_instance_drawing(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.gpu_family() >= 3,
+            OS::tvOS => self.gpu_family() >= 2,
+            OS::macOS => true,
+        }
+    }
+
+    pub fn supports_indirect_buffers(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.gpu_family() >= 3,
+            OS::tvOS => self.gpu_family() >= 2,
+            OS::macOS => true,
+        }
+    }
+
+    pub fn supports_cube_map_texture_arrays(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.gpu_family() >= 4,
+            OS::tvOS => false,
+            OS::macOS => true,
+        }
+    }
+
+    pub fn supports_texture_barriers(&self) -> bool {
+        self.os() == OS::macOS
+    }
+
+    pub fn supports_layered_rendering(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.gpu_family() >= 5,
+            OS::tvOS => false,
+            OS::macOS => true,
+        }
+    }
+
+    pub fn supports_tessellation(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.gpu_family() >= 3 && self.os_version() >= 10,
+            OS::tvOS => self.gpu_family() >= 2,
+            OS::macOS => self.os_version() >= 12,
+        }
+    }
+
+    pub fn supports_resource_heaps(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.os_version() >= 10,
+            OS::tvOS => self.os_version() >= 10,
+            OS::macOS => self.os_version() >= 13,
+        }
+    }
+
+    pub fn supports_memoryless_render_targets(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.os_version() >= 10,
+            OS::tvOS => self.os_version() >= 10,
+            OS::macOS => false,
+        }
+    }
+
+    pub fn supports_function_specialization(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.os_version() >= 10,
+            OS::tvOS => self.os_version() >= 10,
+            OS::macOS => self.os_version() >= 12,
+        }
+    }
+
+    pub fn supports_function_buffer_read_writes(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.gpu_family() >= 3 && self.os_version() >= 10,
+            OS::tvOS => self.gpu_family() >= 2,
+            OS::macOS => self.os_version() >= 12,
+        }
+    }
+
+    pub fn supports_function_texture_read_writes(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.gpu_family() >= 4,
+            OS::tvOS => false,
+            OS::macOS => self.os_version() >= 12,
+        }
+    }
+
+    pub fn supports_array_of_textures(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.gpu_family() >= 3 && self.os_version() >= 10,
+            OS::tvOS => self.gpu_family() >= 2,
+            OS::macOS => self.os_version() >= 13,
+        }
+    }
+
+    pub fn supports_array_of_samplers(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.gpu_family() >= 3 && self.os_version() >= 11,
+            OS::tvOS => self.gpu_family() >= 2,
+            OS::macOS => self.os_version() >= 12,
+        }
+    }
+
+    pub fn supports_stencil_texture_views(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.os_version() >= 10,
+            OS::tvOS => self.os_version() >= 10,
+            OS::macOS => self.os_version() >= 12,
+        }
+    }
+
+    pub fn supports_depth_16_pixel_format(&self) -> bool {
+        self.os() == OS::macOS && self.os_version() >= 12
+    }
+
+    pub fn supports_extended_range_pixel_formats(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.gpu_family() >= 3 && self.os_version() >= 10,
+            OS::tvOS => self.gpu_family() >= 2,
+            OS::macOS => false,
+        }
+    }
+
+    pub fn supports_wide_color_pixel_format(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.os_version() >= 11,
+            OS::tvOS => self.os_version() >= 11,
+            OS::macOS => self.os_version() >= 13,
+        }
+    }
+
+    pub fn supports_combined_msaa_store_and_resolve_action(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.gpu_family() >= 3 && self.os_version() >= 10,
+            OS::tvOS => self.gpu_family() >= 2,
+            OS::macOS => self.os_version() >= 12,
+        }
+    }
+
+    pub fn supports_deferred_store_action(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.os_version() >= 10,
+            OS::tvOS => self.os_version() >= 10,
+            OS::macOS => self.os_version() >= 12,
+        }
+    }
+
+    pub fn supports_msaa_blits(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.os_version() >= 10,
+            OS::tvOS => self.os_version() >= 10,
+            OS::macOS => true,
+        }
+    }
+
+    pub fn supports_srgb_writes(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.gpu_family() >= 3 || (self.gpu_family() >= 2 && self.version() >= 3),
+            OS::tvOS => self.os_version() >= 10,
+            OS::macOS => self.gpu_family() >= 2,
+        }
+    }
+
+    pub fn supports_16_bit_unsigned_integer_coordinates(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.os_version() >= 10,
+            OS::tvOS => self.os_version() >= 10,
+            OS::macOS => self.os_version() >= 12,
+        }
+    }
+
+    pub fn supports_extract_insert_and_reverse_bits(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.os_version() >= 10,
+            OS::tvOS => self.os_version() >= 10,
+            OS::macOS => self.os_version() >= 12,
+        }
+    }
+
+    pub fn supports_simd_barrier(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.os_version() >= 10,
+            OS::tvOS => self.os_version() >= 10,
+            OS::macOS => self.os_version() >= 13,
+        }
+    }
+
+    pub fn supports_sampler_max_anisotropy(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.os_version() >= 10,
+            OS::tvOS => self.os_version() >= 10,
+            OS::macOS => self.os_version() >= 13,
+        }
+    }
+
+    pub fn supports_sampler_lod_clamp(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.os_version() >= 10,
+            OS::tvOS => self.os_version() >= 10,
+            OS::macOS => self.os_version() >= 13,
+        }
+    }
+
+    pub fn supports_border_color(&self) -> bool {
+        self.os() == OS::macOS && self.os_version() >= 12
+    }
+
+    pub fn supports_dual_source_blending(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.os_version() >= 11,
+            OS::tvOS => self.os_version() >= 11,
+            OS::macOS => self.os_version() >= 12,
+        }
+    }
+
+    pub fn supports_argument_buffers(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.os_version() >= 11,
+            OS::tvOS => self.os_version() >= 11,
+            OS::macOS => self.os_version() >= 13,
+        }
+    }
+
+    pub fn supports_programmable_sample_positions(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.os_version() >= 11,
+            OS::tvOS => self.os_version() >= 11,
+            OS::macOS => self.os_version() >= 13,
+        }
+    }
+
+    pub fn supports_uniform_type(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.os_version() >= 11,
+            OS::tvOS => self.os_version() >= 11,
+            OS::macOS => self.os_version() >= 13,
+        }
+    }
+
+    pub fn supports_imageblocks(&self) -> bool {
+        self.os() == OS::iOS && self.gpu_family() >= 4
+    }
+
+    pub fn supports_tile_shaders(&self) -> bool {
+        self.os() == OS::iOS && self.gpu_family() >= 4
+    }
+
+    pub fn supports_imageblock_sample_coverage_control(&self) -> bool {
+        self.os() == OS::iOS && self.gpu_family() >= 4
+    }
+
+    pub fn supports_threadgroup_sharing(&self) -> bool {
+        self.os() == OS::iOS && self.gpu_family() >= 4
+    }
+
+    pub fn supports_post_depth_coverage(&self) -> bool {
+        self.os() == OS::iOS && self.gpu_family() >= 4
+    }
+
+    pub fn supports_quad_scoped_permute_operations(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.gpu_family() >= 4,
+            OS::tvOS => false,
+            OS::macOS => self.os_version() >= 13,
+        }
+    }
+
+    pub fn supports_raster_order_groups(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.gpu_family() >= 4,
+            OS::tvOS => false,
+            OS::macOS => self.os_version() >= 13,
+        }
+    }
+
+    pub fn supports_non_uniform_threadgroup_size(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.gpu_family() >= 4,
+            OS::tvOS => false,
+            OS::macOS => self.os_version() >= 13,
+        }
+    }
+
+    pub fn supports_multiple_viewports(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.gpu_family() >= 5,
+            OS::tvOS => false,
+            OS::macOS => self.os_version() >= 13,
+        }
+    }
+
+    pub fn supports_device_notifications(&self) -> bool {
+        self.os() == OS::macOS && self.os_version() >= 13
+    }
+
+    pub fn supports_stencil_feedback(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.gpu_family() >= 5,
+            OS::tvOS => false,
+            OS::macOS => self.gpu_family() >= 2,
+        }
+    }
+
+    pub fn supports_stencil_resolve(&self) -> bool {
+        match self.os() {
+            OS::iOS => self.gpu_family() >= 5,
+            OS::tvOS => false,
+            OS::macOS => self.gpu_family() >= 2,
+        }
+    }
+
+    pub fn max_vertex_attributes(&self) -> u32 {
+        31
+    }
+
+    pub fn max_buffer_argument_entries(&self) -> u32 {
+        31
+    }
+
+    pub fn max_texture_argument_entries(&self) -> u32 {
+        if self.os() == OS::macOS {
+            128
+        } else {
+            31
+        }
+    }
+
+    pub fn max_sampler_state_argument_entries(&self) -> u32 {
+        16
+    }
+
+    pub fn max_threadgroup_memory_argument_entries(&self) -> u32 {
+        31
+    }
+
+    pub fn max_inlined_constant_data_buffers(&self) -> u32 {
+        if self.os() == OS::macOS {
+            14
+        } else {
+            31
+        }
+    }
+
+    pub fn max_inline_constant_buffer_length(&self) -> u32 {
+        4 * KB
+    }
+
+    pub fn max_threads_per_threadgroup(&self) -> u32 {
+        if self.os() == OS::macOS || self.gpu_family() >= 4 {
+            1024
+        } else {
+            512
+        }
+    }
+
+    pub fn max_total_threadgroup_memory_allocation(&self) -> u32 {
+        match (self.os(), self.gpu_family()) {
+            (OS::iOS, 5) => 64 * KB,
+            (OS::iOS, 4) => {
+                if self.os_version() >= 12 {
+                    64 * KB
+                } else {
+                    32 * KB
+                }
+            }
+            (OS::iOS, 3) => 16 * KB,
+            (OS::iOS, _) => 16 * KB - 32,
+            (OS::tvOS, 1) => 16 * KB - 32,
+            (OS::tvOS, _) => 16 * KB,
+            (OS::macOS, _) => 32 * KB,
+        }
+    }
+
+    pub fn max_total_tile_memory_allocation(&self) -> u32 {
+        if self.os() == OS::iOS && self.gpu_family() == 4 {
+            32 * KB
+        } else {
+            0
+        }
+    }
+
+    pub fn threadgroup_memory_length_alignment(&self) -> u32 {
+        16
+    }
+
+    pub fn max_constant_buffer_function_memory_allocation(&self) -> Option<u32> {
+        if self.os() == OS::macOS {
+            Some(64 * KB)
+        } else {
+            None
+        }
+    }
+
+    pub fn max_fragment_inputs(&self) -> u32 {
+        if self.os() == OS::macOS {
+            32
+        } else {
+            60
+        }
+    }
+
+    pub fn max_fragment_input_components(&self) -> u32 {
+        if self.os() == OS::macOS {
+            128
+        } else {
+            60
+        }
+    }
+
+    pub fn max_function_constants(&self) -> u32 {
+        match self.os() {
+            OS::iOS if self.os_version() >= 11 => 65536,
+            OS::tvOS if self.os_version() >= 10 => 65536,
+            OS::macOS if self.os_version() >= 12 => 65536,
+            _ => 0,
+        }
+    }
+
+    pub fn max_tessellation_factor(&self) -> u32 {
+        if self.supports_tessellation() {
+            match self.os() {
+                OS::iOS if self.gpu_family() >= 5 => 64,
+                OS::iOS => 16,
+                OS::tvOS => 16,
+                OS::macOS => 64,
+            }
+        } else {
+            0
+        }
+    }
+
+    pub fn max_viewports_and_scissor_rectangles(&self) -> u32 {
+        if self.supports_multiple_viewports() {
+            16
+        } else {
+            1
+        }
+    }
+
+    pub fn max_raster_order_groups(&self) -> u32 {
+        if self.supports_raster_order_groups() {
+            8
+        } else {
+            0
+        }
+    }
+
+    pub fn max_buffer_length(&self) -> u32 {
+        if self.os() == OS::macOS && self.os_version() >= 12 {
+            1 * GB
+        } else {
+            256 * MB
+        }
+    }
+
+    pub fn min_buffer_offset_alignment(&self) -> u32 {
+        if self.os() == OS::macOS {
+            256
+        } else {
+            4
+        }
+    }
+
+    pub fn max_1d_texture_size(&self) -> u32 {
+        match (self.os(), self.gpu_family()) {
+            (OS::iOS, 1) | (OS::iOS, 2) => {
+                if self.version() <= 2 {
+                    4096
+                } else {
+                    8192
+                }
+            }
+            (OS::tvOS, 1) => 8192,
+            _ => 16384,
+        }
+    }
+
+    pub fn max_2d_texture_size(&self) -> u32 {
+        match (self.os(), self.gpu_family()) {
+            (OS::iOS, 1) | (OS::iOS, 2) => {
+                if self.version() <= 2 {
+                    4096
+                } else {
+                    8192
+                }
+            }
+            (OS::tvOS, 1) => 8192,
+            _ => 16384,
+        }
+    }
+
+    pub fn max_cube_map_texture_size(&self) -> u32 {
+        match (self.os(), self.gpu_family()) {
+            (OS::iOS, 1) | (OS::iOS, 2) => {
+                if self.version() <= 2 {
+                    4096
+                } else {
+                    8192
+                }
+            }
+            (OS::tvOS, 1) => 8192,
+            _ => 16384,
+        }
+    }
+
+    pub fn max_3d_texture_size(&self) -> u32 {
+        2048
+    }
+
+    pub fn max_array_layers(&self) -> u32 {
+        2048
+    }
+
+    pub fn copy_texture_buffer_alignment(&self) -> u32 {
+        match (self.os(), self.gpu_family()) {
+            (OS::iOS, 1) | (OS::iOS, 2) | (OS::tvOS, 1) => 64,
+            (OS::iOS, _) | (OS::tvOS, _) => 16,
+            (OS::macOS, _) => 256,
+        }
+    }
+
+    /// If this function returns `None` but linear textures are supported,
+    /// the buffer alignment can be discovered via API query
+    pub fn new_texture_buffer_alignment(&self) -> Option<u32> {
+        match self.os() {
+            OS::iOS => {
+                if self.os_version() >= 11 {
+                    None
+                } else if self.gpu_family() == 3 {
+                    Some(16)
+                } else {
+                    Some(64)
+                }
+            }
+            OS::tvOS => {
+                if self.os_version() >= 11 {
+                    None
+                } else {
+                    Some(64)
+                }
+            }
+            OS::macOS => None,
+        }
+    }
+
+    pub fn max_color_render_targets(&self) -> u32 {
+        if self.os() == OS::iOS && self.gpu_family() == 1 {
+            4
+        } else {
+            8
+        }
+    }
+
+    pub fn max_point_primitive_size(&self) -> u32 {
+        511
+    }
+
+    pub fn max_total_color_render_target_size(&self) -> Option<u32> {
+        match (self.os(), self.gpu_family()) {
+            (OS::iOS, 1) => Some(128),
+            (OS::iOS, 2) | (OS::iOS, 3) => Some(256),
+            (OS::iOS, _) => Some(512),
+            (OS::tvOS, _) => Some(256),
+            (OS::macOS, _) => None,
+        }
+    }
+
+    pub fn max_visibility_query_offset(&self) -> u32 {
+        64 * KB - 8
+    }
+
+    pub fn a8_unorm_capabilities(&self) -> PixelFormatCapabilities {
+        PixelFormatCapabilities::Filter
+    }
+
+    pub fn r8_unorm_capabilities(&self) -> PixelFormatCapabilities {
+        PixelFormatCapabilities::all()
+    }
+
+    pub fn r8_unorm_srgb_capabilities(&self) -> PixelFormatCapabilities {
+        if self.os() == OS::macOS {
+            PixelFormatCapabilities::empty()
+        } else if self.supports_srgb_writes() {
+            PixelFormatCapabilities::all()
+        } else {
+            !PixelFormatCapabilities::Write
+        }
+    }
+
+    pub fn r8_snorm_capabilities(&self) -> PixelFormatCapabilities {
+        if self.os() == OS::iOS && self.gpu_family() == 1 {
+            !PixelFormatCapabilities::Resolve
+        } else {
+            PixelFormatCapabilities::all()
+        }
+    }
+
+    pub fn r8_uint_capabilities(&self) -> PixelFormatCapabilities {
+        PixelFormatCapabilities::Write
+            | PixelFormatCapabilities::Color
+            | PixelFormatCapabilities::Msaa
+    }
+
+    pub fn r8_sint_capabilities(&self) -> PixelFormatCapabilities {
+        PixelFormatCapabilities::Write
+            | PixelFormatCapabilities::Color
+            | PixelFormatCapabilities::Msaa
+    }
+
+    pub fn r16_unorm_capabilities(&self) -> PixelFormatCapabilities {
+        if self.os() != OS::macOS {
+            !PixelFormatCapabilities::Resolve
+        } else {
+            PixelFormatCapabilities::all()
+        }
+    }
+
+    pub fn r16_snorm_capabilities(&self) -> PixelFormatCapabilities {
+        if self.os() != OS::macOS {
+            !PixelFormatCapabilities::Resolve
+        } else {
+            PixelFormatCapabilities::all()
+        }
+    }
+
+    pub fn r16_uint_capabilities(&self) -> PixelFormatCapabilities {
+        PixelFormatCapabilities::Write
+            | PixelFormatCapabilities::Color
+            | PixelFormatCapabilities::Msaa
+    }
+
+    pub fn r16_sint_capabilities(&self) -> PixelFormatCapabilities {
+        PixelFormatCapabilities::Write
+            | PixelFormatCapabilities::Color
+            | PixelFormatCapabilities::Msaa
+    }
+
+    pub fn r16_float_capabilities(&self) -> PixelFormatCapabilities {
+        PixelFormatCapabilities::all()
+    }
+
+    pub fn rg8_unorm_capabilities(&self) -> PixelFormatCapabilities {
+        PixelFormatCapabilities::all()
+    }
+
+    pub fn rg8_unorm_srgb_capabilities(&self) -> PixelFormatCapabilities {
+        if self.os() == OS::macOS {
+            PixelFormatCapabilities::empty()
+        } else if self.supports_srgb_writes() {
+            PixelFormatCapabilities::all()
+        } else {
+            !PixelFormatCapabilities::Write
+        }
+    }
+
+    pub fn rg8_snorm_capabilities(&self) -> PixelFormatCapabilities {
+        if self.os() == OS::iOS && self.gpu_family() == 1 {
+            !PixelFormatCapabilities::Resolve
+        } else {
+            PixelFormatCapabilities::all()
+        }
+    }
+
+    pub fn rg8_uint_capabilities(&self) -> PixelFormatCapabilities {
+        PixelFormatCapabilities::Write
+            | PixelFormatCapabilities::Color
+            | PixelFormatCapabilities::Msaa
+    }
+
+    pub fn rg8_sint_capabilities(&self) -> PixelFormatCapabilities {
+        PixelFormatCapabilities::Write
+            | PixelFormatCapabilities::Color
+            | PixelFormatCapabilities::Msaa
+    }
+
+    pub fn b5_g6_r5_unorm_capabilities(&self) -> PixelFormatCapabilities {
+        if self.os() == OS::macOS {
+            PixelFormatCapabilities::empty()
+        } else {
+            !PixelFormatCapabilities::Write
+        }
+    }
+
+    pub fn a1_bgr5_unorm_capabilities(&self) -> PixelFormatCapabilities {
+        if self.os() == OS::macOS {
+            PixelFormatCapabilities::empty()
+        } else {
+            !PixelFormatCapabilities::Write
+        }
+    }
+
+    pub fn abgr4_unorm_capabilities(&self) -> PixelFormatCapabilities {
+        if self.os() == OS::macOS {
+            PixelFormatCapabilities::empty()
+        } else {
+            !PixelFormatCapabilities::Write
+        }
+    }
+
+    pub fn bgr5_a1_unorm_capabilities(&self) -> PixelFormatCapabilities {
+        if self.os() == OS::macOS {
+            PixelFormatCapabilities::empty()
+        } else {
+            !PixelFormatCapabilities::Write
+        }
+    }
+
+    pub fn r32_uint_capabilities(&self) -> PixelFormatCapabilities {
+        if self.os() == OS::iOS && self.os_version() == 8 {
+            PixelFormatCapabilities::Color
+        } else if self.os() == OS::macOS {
+            PixelFormatCapabilities::Color
+                | PixelFormatCapabilities::Write
+                | PixelFormatCapabilities::Msaa
+        } else {
+            PixelFormatCapabilities::Color | PixelFormatCapabilities::Write
+        }
+    }
+
+    pub fn r32_sint_capabilities(&self) -> PixelFormatCapabilities {
+        if self.os() == OS::iOS && self.os_version() == 8 {
+            PixelFormatCapabilities::Color
+        } else if self.os() == OS::macOS {
+            PixelFormatCapabilities::Color
+                | PixelFormatCapabilities::Write
+                | PixelFormatCapabilities::Msaa
+        } else {
+            PixelFormatCapabilities::Color | PixelFormatCapabilities::Write
+        }
+    }
+
+    pub fn r32_float_capabilities(&self) -> PixelFormatCapabilities {
+        if self.os() == OS::iOS && self.os_version() == 8 {
+            PixelFormatCapabilities::Color
+                | PixelFormatCapabilities::Blend
+                | PixelFormatCapabilities::Msaa
+        } else if self.os() == OS::macOS {
+            PixelFormatCapabilities::all()
+        } else {
+            PixelFormatCapabilities::Write
+                | PixelFormatCapabilities::Color
+                | PixelFormatCapabilities::Blend
+                | PixelFormatCapabilities::Msaa
+        }
+    }
+
+    pub fn rg16_unorm_capabilities(&self) -> PixelFormatCapabilities {
+        if self.os() == OS::macOS {
+            PixelFormatCapabilities::all()
+        } else {
+            !PixelFormatCapabilities::Resolve
+        }
+    }
+
+    pub fn rg16_snorm_capabilities(&self) -> PixelFormatCapabilities {
+        if self.os() == OS::macOS {
+            PixelFormatCapabilities::all()
+        } else {
+            !PixelFormatCapabilities::Resolve
+        }
+    }
+
+    pub fn rg16_uint_capabilities(&self) -> PixelFormatCapabilities {
+        PixelFormatCapabilities::Write
+            | PixelFormatCapabilities::Color
+            | PixelFormatCapabilities::Msaa
+    }
+
+    pub fn rg16_sint_capabilities(&self) -> PixelFormatCapabilities {
+        PixelFormatCapabilities::Write
+            | PixelFormatCapabilities::Color
+            | PixelFormatCapabilities::Msaa
+    }
+
+    pub fn rg16_float_capabilities(&self) -> PixelFormatCapabilities {
+        PixelFormatCapabilities::all()
+    }
+
+    pub fn rgba8_unorm_capabilities(&self) -> PixelFormatCapabilities {
+        PixelFormatCapabilities::all()
+    }
+
+    pub fn rgba8_unorm_srgb_capabilities(&self) -> PixelFormatCapabilities {
+        if self.supports_srgb_writes() {
+            PixelFormatCapabilities::all()
+        } else {
+            !PixelFormatCapabilities::Write
+        }
+    }
+
+    pub fn rgba8_snorm_capabilities(&self) -> PixelFormatCapabilities {
+        if self.os() == OS::iOS && self.gpu_family() == 1 {
+            !PixelFormatCapabilities::Resolve
+        } else {
+            PixelFormatCapabilities::all()
+        }
+    }
+
+    pub fn rgba8_uint_capabilities(&self) -> PixelFormatCapabilities {
+        PixelFormatCapabilities::Write
+            | PixelFormatCapabilities::Color
+            | PixelFormatCapabilities::Msaa
+    }
+
+    pub fn rgba8_sint_capabilities(&self) -> PixelFormatCapabilities {
+        PixelFormatCapabilities::Write
+            | PixelFormatCapabilities::Color
+            | PixelFormatCapabilities::Msaa
+    }
+
+    pub fn bgra8_unorm_capabilities(&self) -> PixelFormatCapabilities {
+        PixelFormatCapabilities::all()
+    }
+
+    pub fn bgra8_unorm_srgb_capabilities(&self) -> PixelFormatCapabilities {
+        if self.supports_srgb_writes() {
+            PixelFormatCapabilities::all()
+        } else {
+            !PixelFormatCapabilities::Write
+        }
+    }
+
+    pub fn rgb10_a2_unorm_capabilities(&self) -> PixelFormatCapabilities {
+        let supports_writes = match self.os() {
+            OS::iOS => self.gpu_family() >= 3,
+            OS::tvOS => self.gpu_family() >= 2,
+            OS::macOS => true,
+        };
+        if supports_writes {
+            PixelFormatCapabilities::all()
+        } else {
+            !PixelFormatCapabilities::Write
+        }
+    }
+
+    pub fn rgb10_a2_uint_capabilities(&self) -> PixelFormatCapabilities {
+        let supports_writes = match self.os() {
+            OS::iOS => self.gpu_family() >= 3,
+            OS::tvOS => self.gpu_family() >= 2,
+            OS::macOS => true,
+        };
+        if supports_writes {
+            PixelFormatCapabilities::Write
+                | PixelFormatCapabilities::Color
+                | PixelFormatCapabilities::Msaa
+        } else {
+            PixelFormatCapabilities::Color | PixelFormatCapabilities::Msaa
+        }
+    }
+
+    pub fn rg11_b10_float_capabilities(&self) -> PixelFormatCapabilities {
+        let supports_writes = match self.os() {
+            OS::iOS => self.gpu_family() >= 3,
+            OS::tvOS => self.gpu_family() >= 2,
+            OS::macOS => true,
+        };
+        if supports_writes {
+            PixelFormatCapabilities::all()
+        } else {
+            !PixelFormatCapabilities::Write
+        }
+    }
+
+    pub fn rgb9_e5_float_capabilities(&self) -> PixelFormatCapabilities {
+        if self.os() == OS::macOS {
+            PixelFormatCapabilities::Filter
+        } else {
+            let supports_writes = match self.os() {
+                OS::iOS => self.gpu_family() >= 3,
+                OS::tvOS => self.gpu_family() >= 2,
+                OS::macOS => false,
+            };
+            if supports_writes {
+                PixelFormatCapabilities::all()
+            } else {
+                !PixelFormatCapabilities::Write
+            }
+        }
+    }
+
+    pub fn rg32_uint_capabilities(&self) -> PixelFormatCapabilities {
+        if self.os() == OS::iOS && self.os_version() == 8 {
+            PixelFormatCapabilities::Color
+        } else if self.os() == OS::macOS {
+            PixelFormatCapabilities::Color
+                | PixelFormatCapabilities::Write
+                | PixelFormatCapabilities::Msaa
+        } else {
+            PixelFormatCapabilities::Color | PixelFormatCapabilities::Write
+        }
+    }
+
+    pub fn rg32_sint_capabilities(&self) -> PixelFormatCapabilities {
+        if self.os() == OS::iOS && self.os_version() == 8 {
+            PixelFormatCapabilities::Color
+        } else if self.os() == OS::macOS {
+            PixelFormatCapabilities::Color
+                | PixelFormatCapabilities::Write
+                | PixelFormatCapabilities::Msaa
+        } else {
+            PixelFormatCapabilities::Color | PixelFormatCapabilities::Write
+        }
+    }
+
+    pub fn rg32_float_capabilities(&self) -> PixelFormatCapabilities {
+        if self.os() == OS::macOS {
+            PixelFormatCapabilities::all()
+        } else if self.os() == OS::iOS && self.os_version() == 8 {
+            PixelFormatCapabilities::Color | PixelFormatCapabilities::Blend
+        } else {
+            PixelFormatCapabilities::Write
+                | PixelFormatCapabilities::Color
+                | PixelFormatCapabilities::Blend
+        }
+    }
+
+    pub fn rgba16_unorm_capabilities(&self) -> PixelFormatCapabilities {
+        if self.os() == OS::macOS {
+            PixelFormatCapabilities::all()
+        } else {
+            !PixelFormatCapabilities::Write
+        }
+    }
+
+    pub fn rgba16_snorm_capabilities(&self) -> PixelFormatCapabilities {
+        if self.os() == OS::macOS {
+            PixelFormatCapabilities::all()
+        } else {
+            !PixelFormatCapabilities::Write
+        }
+    }
+
+    pub fn rgba16_uint_capabilities(&self) -> PixelFormatCapabilities {
+        PixelFormatCapabilities::Write
+            | PixelFormatCapabilities::Color
+            | PixelFormatCapabilities::Msaa
+    }
+
+    pub fn rgba16_sint_capabilities(&self) -> PixelFormatCapabilities {
+        PixelFormatCapabilities::Write
+            | PixelFormatCapabilities::Color
+            | PixelFormatCapabilities::Msaa
+    }
+
+    pub fn rgba16_float_capabilities(&self) -> PixelFormatCapabilities {
+        PixelFormatCapabilities::all()
+    }
+
+    pub fn rgba32_uint_capabilities(&self) -> PixelFormatCapabilities {
+        if self.os() == OS::iOS && self.os_version() == 8 {
+            PixelFormatCapabilities::Color
+        } else if self.os() == OS::macOS {
+            PixelFormatCapabilities::Color
+                | PixelFormatCapabilities::Write
+                | PixelFormatCapabilities::Msaa
+        } else {
+            PixelFormatCapabilities::Color | PixelFormatCapabilities::Write
+        }
+    }
+
+    pub fn rgba32_sint_capabilities(&self) -> PixelFormatCapabilities {
+        if self.os() == OS::iOS && self.os_version() == 8 {
+            PixelFormatCapabilities::Color
+        } else if self.os() == OS::macOS {
+            PixelFormatCapabilities::Color
+                | PixelFormatCapabilities::Write
+                | PixelFormatCapabilities::Msaa
+        } else {
+            PixelFormatCapabilities::Color | PixelFormatCapabilities::Write
+        }
+    }
+
+    pub fn rgba32_float_capabilities(&self) -> PixelFormatCapabilities {
+        if self.os() == OS::macOS {
+            PixelFormatCapabilities::all()
+        } else if self.os() == OS::iOS && self.version() == 8 {
+            PixelFormatCapabilities::Color
+        } else {
+            PixelFormatCapabilities::Write | PixelFormatCapabilities::Color
+        }
+    }
+
+    pub fn pvrtc_pixel_formats_capabilities(&self) -> PixelFormatCapabilities {
+        if self.supports_pvrtc_pixel_formats() {
+            PixelFormatCapabilities::Filter
+        } else {
+            PixelFormatCapabilities::empty()
+        }
+    }
+
+    pub fn eac_etc_pixel_formats_capabilities(&self) -> PixelFormatCapabilities {
+        if self.supports_eac_etc_pixel_formats() {
+            PixelFormatCapabilities::Filter
+        } else {
+            PixelFormatCapabilities::empty()
+        }
+    }
+
+    pub fn astc_pixel_formats_capabilities(&self) -> PixelFormatCapabilities {
+        if self.supports_astc_pixel_formats() {
+            PixelFormatCapabilities::Filter
+        } else {
+            PixelFormatCapabilities::empty()
+        }
+    }
+
+    pub fn bc_pixel_formats_capabilities(&self) -> PixelFormatCapabilities {
+        if self.supports_bc_pixel_formats() {
+            PixelFormatCapabilities::Filter
+        } else {
+            PixelFormatCapabilities::empty()
+        }
+    }
+
+    pub fn gbgr422_capabilities(&self) -> PixelFormatCapabilities {
+        PixelFormatCapabilities::Filter
+    }
+
+    pub fn bgrg422_capabilities(&self) -> PixelFormatCapabilities {
+        PixelFormatCapabilities::Filter
+    }
+
+    pub fn depth16_unorm_capabilities(&self) -> PixelFormatCapabilities {
+        if self.supports_depth_16_pixel_format() {
+            PixelFormatCapabilities::Filter
+                | PixelFormatCapabilities::Msaa
+                | PixelFormatCapabilities::Resolve
+        } else {
+            PixelFormatCapabilities::empty()
+        }
+    }
+
+    pub fn depth32_float_capabilities(&self) -> PixelFormatCapabilities {
+        if self.os() == OS::macOS {
+            PixelFormatCapabilities::Filter
+                | PixelFormatCapabilities::Msaa
+                | PixelFormatCapabilities::Resolve
+        } else if self.supports_msaa_depth_resolve() {
+            PixelFormatCapabilities::Msaa | PixelFormatCapabilities::Resolve
+        } else {
+            PixelFormatCapabilities::Msaa
+        }
+    }
+
+    pub fn stencil8_capabilities(&self) -> PixelFormatCapabilities {
+        PixelFormatCapabilities::Msaa
+    }
+
+    pub fn depth24_unorm_stencil8_capabilities(&self) -> PixelFormatCapabilities {
+        if self.os() == OS::macOS {
+            PixelFormatCapabilities::Filter
+                | PixelFormatCapabilities::Msaa
+                | PixelFormatCapabilities::Resolve
+        } else {
+            PixelFormatCapabilities::empty()
+        }
+    }
+
+    pub fn depth32_float_stencil8_capabilities(&self) -> PixelFormatCapabilities {
+        if self.os() == OS::macOS {
+            PixelFormatCapabilities::Filter
+                | PixelFormatCapabilities::Msaa
+                | PixelFormatCapabilities::Resolve
+        } else if self.supports_msaa_depth_resolve() {
+            PixelFormatCapabilities::Msaa | PixelFormatCapabilities::Resolve
+        } else {
+            PixelFormatCapabilities::Msaa
+        }
+    }
+
+    pub fn x24_stencil8_capabilities(&self) -> PixelFormatCapabilities {
+        if self.os() == OS::macOS {
+            PixelFormatCapabilities::Msaa
+        } else {
+            PixelFormatCapabilities::empty()
+        }
+    }
+
+    pub fn x32_stencil8_capabilities(&self) -> PixelFormatCapabilities {
+        PixelFormatCapabilities::Msaa
+    }
+
+    pub fn bgra10_xr_capabilities(&self) -> PixelFormatCapabilities {
+        if self.supports_extended_range_pixel_formats() {
+            PixelFormatCapabilities::all()
+        } else {
+            PixelFormatCapabilities::empty()
+        }
+    }
+
+    pub fn bgra10_xr_srgb_capabilities(&self) -> PixelFormatCapabilities {
+        if self.supports_extended_range_pixel_formats() {
+            PixelFormatCapabilities::all()
+        } else {
+            PixelFormatCapabilities::empty()
+        }
+    }
+
+    pub fn bgr10_xr_capabilities(&self) -> PixelFormatCapabilities {
+        if self.supports_extended_range_pixel_formats() {
+            PixelFormatCapabilities::all()
+        } else {
+            PixelFormatCapabilities::empty()
+        }
+    }
+
+    pub fn bgr10_xr_srgb_capabilities(&self) -> PixelFormatCapabilities {
+        if self.supports_extended_range_pixel_formats() {
+            PixelFormatCapabilities::all()
+        } else {
+            PixelFormatCapabilities::empty()
+        }
+    }
+
+    pub fn bgr10_a2_unorm_capabilities(&self) -> PixelFormatCapabilities {
+        if self.supports_wide_color_pixel_format() {
+            if self.os() == OS::macOS {
+                !PixelFormatCapabilities::Write
+            } else {
+                PixelFormatCapabilities::all()
+            }
+        } else {
+            PixelFormatCapabilities::empty()
+        }
+    }
+}
+
+#[allow(non_camel_case_types)]
+#[repr(u64)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+pub enum MTLArgumentBuffersTier {
+    tier1 = 0,
+    tier2 = 1,
+}
+
+bitflags! {
+    struct MTLPipelineOption: NSUInteger {
+        const ArgumentInfo   = 1 << 0;
+        const BufferTypeInfo = 1 << 1;
+    }
+}
+
+#[link(name = "Metal", kind = "framework")]
+extern "C" {
+    fn MTLCreateSystemDefaultDevice() -> *mut MTLDevice;
+    #[cfg(not(target_os = "ios"))]
+    fn MTLCopyAllDevices() -> *mut Object; //TODO: Array
+}
+
+#[allow(non_camel_case_types)]
+type dispatch_data_t = id;
+#[allow(non_camel_case_types)]
+type dispatch_queue_t = id;
+#[allow(non_camel_case_types)]
+type dispatch_block_t = *const Block<(), ()>;
+
+#[cfg_attr(
+    any(target_os = "macos", target_os = "ios"),
+    link(name = "System", kind = "dylib")
+)]
+#[cfg_attr(
+    not(any(target_os = "macos", target_os = "ios")),
+    link(name = "dispatch", kind = "dylib")
+)]
+#[allow(improper_ctypes)]
+extern "C" {
+    static _dispatch_main_q: dispatch_queue_t;
+
+    fn dispatch_data_create(
+        buffer: *const std::ffi::c_void,
+        size: crate::c_size_t,
+        queue: dispatch_queue_t,
+        destructor: dispatch_block_t,
+    ) -> dispatch_data_t;
+    fn dispatch_release(object: dispatch_data_t); // actually dispatch_object_t
+}
+
+/*type MTLNewLibraryCompletionHandler = extern fn(library: id, error: id);
+type MTLNewRenderPipelineStateCompletionHandler = extern fn(renderPipelineState: id, error: id);
+type MTLNewRenderPipelineStateWithReflectionCompletionHandler = extern fn(renderPipelineState: id, reflection: id, error: id);
+type MTLNewComputePipelineStateCompletionHandler = extern fn(computePipelineState: id, error: id);
+type MTLNewComputePipelineStateWithReflectionCompletionHandler = extern fn(computePipelineState: id, reflection: id, error: id);*/
+
+pub enum MTLDevice {}
+
+foreign_obj_type! {
+    type CType = MTLDevice;
+    pub struct Device;
+    pub struct DeviceRef;
+}
+
+impl Device {
+    pub fn system_default() -> Option<Self> {
+        // `MTLCreateSystemDefaultDevice` may return null if Metal is not supported
+        unsafe { MTLCreateSystemDefaultDevice().as_mut().map(|x| Self(x)) }
+    }
+
+    pub fn all() -> Vec<Self> {
+        #[cfg(target_os = "ios")]
+        {
+            Self::system_default().into_iter().collect()
+        }
+        #[cfg(not(target_os = "ios"))]
+        unsafe {
+            let array = MTLCopyAllDevices();
+            let count: NSUInteger = msg_send![array, count];
+            let ret = (0..count)
+                .map(|i| msg_send![array, objectAtIndex: i])
+                // The elements of this array are references---we convert them to owned references
+                // (which just means that we increment the reference count here, and it is
+                // decremented in the `Drop` impl for `Device`)
+                .map(|device: *mut Object| msg_send![device, retain])
+                .collect();
+            let () = msg_send![array, release];
+            ret
+        }
+    }
+}
+
+impl DeviceRef {
+    pub fn name(&self) -> &str {
+        unsafe {
+            let name = msg_send![self, name];
+            crate::nsstring_as_str(name)
+        }
+    }
+
+    #[cfg(feature = "private")]
+    pub unsafe fn vendor(&self) -> &str {
+        let name = msg_send![self, vendorName];
+        crate::nsstring_as_str(name)
+    }
+
+    #[cfg(feature = "private")]
+    pub unsafe fn family_name(&self) -> &str {
+        let name = msg_send![self, familyName];
+        crate::nsstring_as_str(name)
+    }
+
+    pub fn registry_id(&self) -> u64 {
+        unsafe { msg_send![self, registryID] }
+    }
+
+    pub fn max_threads_per_threadgroup(&self) -> MTLSize {
+        unsafe { msg_send![self, maxThreadsPerThreadgroup] }
+    }
+
+    pub fn is_low_power(&self) -> bool {
+        unsafe {
+            match msg_send![self, isLowPower] {
+                YES => true,
+                NO => false,
+                _ => unreachable!(),
+            }
+        }
+    }
+
+    pub fn is_headless(&self) -> bool {
+        unsafe {
+            match msg_send![self, isHeadless] {
+                YES => true,
+                NO => false,
+                _ => unreachable!(),
+            }
+        }
+    }
+
+    pub fn is_removable(&self) -> bool {
+        unsafe {
+            match msg_send![self, isRemovable] {
+                YES => true,
+                NO => false,
+                _ => unreachable!(),
+            }
+        }
+    }
+
+    pub fn supports_feature_set(&self, feature: MTLFeatureSet) -> bool {
+        unsafe {
+            match msg_send![self, supportsFeatureSet: feature] {
+                YES => true,
+                NO => false,
+                _ => unreachable!(),
+            }
+        }
+    }
+
+    pub fn supports_vertex_amplification_count(&self, count: NSUInteger) -> bool {
+        unsafe {
+            match msg_send![self, supportsVertexAmplificationCount: count] {
+                YES => true,
+                NO => false,
+                _ => unreachable!(),
+            }
+        }
+    }
+
+    pub fn supports_sample_count(&self, count: NSUInteger) -> bool {
+        unsafe {
+            match msg_send![self, supportsTextureSampleCount: count] {
+                YES => true,
+                NO => false,
+                _ => unreachable!(),
+            }
+        }
+    }
+
+    pub fn d24_s8_supported(&self) -> bool {
+        unsafe {
+            match msg_send![self, isDepth24Stencil8PixelFormatSupported] {
+                YES => true,
+                NO => false,
+                _ => unreachable!(),
+            }
+        }
+    }
+
+    pub fn new_command_queue(&self) -> CommandQueue {
+        unsafe { msg_send![self, newCommandQueue] }
+    }
+
+    pub fn new_command_queue_with_max_command_buffer_count(
+        &self,
+        count: NSUInteger,
+    ) -> CommandQueue {
+        unsafe { msg_send![self, newCommandQueueWithMaxCommandBufferCount: count] }
+    }
+
+    pub fn new_default_library(&self) -> Library {
+        unsafe { msg_send![self, newDefaultLibrary] }
+    }
+
+    pub fn new_library_with_source(
+        &self,
+        src: &str,
+        options: &CompileOptionsRef,
+    ) -> Result<Library, String> {
+        use cocoa_foundation::base::nil as cocoa_nil;
+        use cocoa_foundation::foundation::NSString as cocoa_NSString;
+
+        unsafe {
+            let source = cocoa_NSString::alloc(cocoa_nil).init_str(src);
+            let mut err: *mut Object = ptr::null_mut();
+            let library: *mut MTLLibrary = msg_send![self, newLibraryWithSource:source
+                                                                        options:options
+                                                                          error:&mut err];
+            let () = msg_send![source, release];
+            if !err.is_null() {
+                let desc: *mut Object = msg_send![err, localizedDescription];
+                let compile_error: *const std::os::raw::c_char = msg_send![desc, UTF8String];
+                let message = CStr::from_ptr(compile_error).to_string_lossy().into_owned();
+                if library.is_null() {
+                    let () = msg_send![err, release];
+                    return Err(message);
+                } else {
+                    warn!("Shader warnings: {}", message);
+                }
+            }
+
+            assert!(!library.is_null());
+            Ok(Library::from_ptr(library))
+        }
+    }
+
+    pub fn new_library_with_file<P: AsRef<Path>>(&self, file: P) -> Result<Library, String> {
+        use cocoa_foundation::base::nil as cocoa_nil;
+        use cocoa_foundation::foundation::NSString as cocoa_NSString;
+
+        unsafe {
+            let filename =
+                cocoa_NSString::alloc(cocoa_nil).init_str(file.as_ref().to_string_lossy().as_ref());
+
+            let library: *mut MTLLibrary = try_objc! { err =>
+                msg_send![self, newLibraryWithFile:filename.as_ref()
+                                             error:&mut err]
+            };
+
+            Ok(Library::from_ptr(library))
+        }
+    }
+
+    pub fn new_library_with_data(&self, library_data: &[u8]) -> Result<Library, String> {
+        unsafe {
+            let destructor_block = ConcreteBlock::new(|| {}).copy();
+            let data = dispatch_data_create(
+                library_data.as_ptr() as *const std::ffi::c_void,
+                library_data.len() as crate::c_size_t,
+                &_dispatch_main_q as *const _ as dispatch_queue_t,
+                &*destructor_block.deref(),
+            );
+
+            let library: *mut MTLLibrary = try_objc! { err =>
+                 msg_send![self, newLibraryWithData:data
+                                              error:&mut err]
+            };
+            dispatch_release(data);
+            Ok(Library::from_ptr(library))
+        }
+    }
+
+    pub fn new_render_pipeline_state_with_reflection(
+        &self,
+        descriptor: &RenderPipelineDescriptorRef,
+        reflection: &RenderPipelineReflectionRef,
+    ) -> Result<RenderPipelineState, String> {
+        unsafe {
+            let reflection_options =
+                MTLPipelineOption::ArgumentInfo | MTLPipelineOption::BufferTypeInfo;
+
+            let pipeline_state: *mut MTLRenderPipelineState = try_objc! { err =>
+                msg_send![self, newRenderPipelineStateWithDescriptor:descriptor
+                                                             options:reflection_options
+                                                          reflection:reflection
+                                                               error:&mut err]
+            };
+
+            Ok(RenderPipelineState::from_ptr(pipeline_state))
+        }
+    }
+
+    pub fn new_render_pipeline_state(
+        &self,
+        descriptor: &RenderPipelineDescriptorRef,
+    ) -> Result<RenderPipelineState, String> {
+        unsafe {
+            let pipeline_state: *mut MTLRenderPipelineState = try_objc! { err =>
+                msg_send![self, newRenderPipelineStateWithDescriptor:descriptor
+                                                               error:&mut err]
+            };
+
+            Ok(RenderPipelineState::from_ptr(pipeline_state))
+        }
+    }
+
+    pub fn new_compute_pipeline_state_with_function(
+        &self,
+        function: &FunctionRef,
+    ) -> Result<ComputePipelineState, String> {
+        unsafe {
+            let pipeline_state: *mut MTLComputePipelineState = try_objc! { err =>
+                msg_send![self, newComputePipelineStateWithFunction:function
+                                                              error:&mut err]
+            };
+
+            Ok(ComputePipelineState::from_ptr(pipeline_state))
+        }
+    }
+
+    pub fn new_compute_pipeline_state(
+        &self,
+        descriptor: &ComputePipelineDescriptorRef,
+    ) -> Result<ComputePipelineState, String> {
+        unsafe {
+            let pipeline_state: *mut MTLComputePipelineState = try_objc! { err =>
+                msg_send![self, newComputePipelineStateWithDescriptor:descriptor
+                                                                error:&mut err]
+            };
+
+            Ok(ComputePipelineState::from_ptr(pipeline_state))
+        }
+    }
+
+    pub fn new_buffer(&self, length: u64, options: MTLResourceOptions) -> Buffer {
+        unsafe {
+            msg_send![self, newBufferWithLength:length
+                                        options:options]
+        }
+    }
+
+    pub fn new_buffer_with_data(
+        &self,
+        bytes: *const std::ffi::c_void,
+        length: NSUInteger,
+        options: MTLResourceOptions,
+    ) -> Buffer {
+        unsafe {
+            msg_send![self, newBufferWithBytes:bytes
+                                        length:length
+                                       options:options]
+        }
+    }
+
+    pub fn new_texture(&self, descriptor: &TextureDescriptorRef) -> Texture {
+        unsafe { msg_send![self, newTextureWithDescriptor: descriptor] }
+    }
+
+    pub fn new_sampler(&self, descriptor: &SamplerDescriptorRef) -> SamplerState {
+        unsafe { msg_send![self, newSamplerStateWithDescriptor: descriptor] }
+    }
+
+    pub fn new_depth_stencil_state(
+        &self,
+        descriptor: &DepthStencilDescriptorRef,
+    ) -> DepthStencilState {
+        unsafe { msg_send![self, newDepthStencilStateWithDescriptor: descriptor] }
+    }
+
+    pub fn argument_buffers_support(&self) -> Option<MTLArgumentBuffersTier> {
+        unsafe {
+            let has_arg_buffers: BOOL =
+                msg_send![self, respondsToSelector: sel!(argumentBuffersSupport)];
+            if has_arg_buffers == YES {
+                Some(msg_send![self, argumentBuffersSupport])
+            } else {
+                None
+            }
+        }
+    }
+
+    pub fn new_argument_encoder(
+        &self,
+        arguments: &ArrayRef<ArgumentDescriptor>,
+    ) -> ArgumentEncoder {
+        unsafe { msg_send![self, newArgumentEncoderWithArguments: arguments] }
+    }
+
+    pub fn new_heap(&self, descriptor: &HeapDescriptorRef) -> Heap {
+        unsafe { msg_send![self, newHeapWithDescriptor: descriptor] }
+    }
+
+    pub fn heap_buffer_size_and_align(
+        &self,
+        length: NSUInteger,
+        options: MTLResourceOptions,
+    ) -> MTLSizeAndAlign {
+        unsafe { msg_send![self, heapBufferSizeAndAlignWithLength: length options: options] }
+    }
+
+    pub fn heap_texture_size_and_align(
+        &self,
+        descriptor: &TextureDescriptorRef,
+    ) -> MTLSizeAndAlign {
+        unsafe { msg_send![self, heapTextureSizeAndAlignWithDescriptor: descriptor] }
+    }
+
+    pub fn minimum_linear_texture_alignment_for_pixel_format(
+        &self,
+        format: MTLPixelFormat,
+    ) -> NSUInteger {
+        unsafe { msg_send![self, minimumLinearTextureAlignmentForPixelFormat: format] }
+    }
+
+    pub fn minimum_texture_buffer_alignment_for_pixel_format(
+        &self,
+        format: MTLPixelFormat,
+    ) -> NSUInteger {
+        unsafe { msg_send![self, minimumTextureBufferAlignmentForPixelFormat: format] }
+    }
+
+    pub fn max_argument_buffer_sampler_count(&self) -> NSUInteger {
+        unsafe { msg_send![self, maxArgumentBufferSamplerCount] }
+    }
+}
diff --git a/third_party/rust/metal/src/drawable.rs b/third_party/rust/metal/src/drawable.rs
new file mode 100644
index 0000000000..0e6d8377c4
--- /dev/null
+++ b/third_party/rust/metal/src/drawable.rs
@@ -0,0 +1,20 @@
+// Copyright 2016 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+pub enum MTLDrawable {}
+
+foreign_obj_type! {
+    type CType = MTLDrawable;
+    pub struct Drawable;
+    pub struct DrawableRef;
+}
+
+impl DrawableRef {
+    pub fn present(&self) {
+        unsafe { msg_send![self, present] }
+    }
+}
diff --git a/third_party/rust/metal/src/encoder.rs b/third_party/rust/metal/src/encoder.rs
new file mode 100644
index 0000000000..ba9d664d99
--- /dev/null
+++ b/third_party/rust/metal/src/encoder.rs
@@ -0,0 +1,1121 @@
+// Copyright 2017 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+use super::*;
+
+use cocoa_foundation::foundation::{NSInteger, NSRange, NSUInteger};
+
+use std::ops::Range;
+
+#[repr(u64)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+pub enum MTLPrimitiveType {
+    Point = 0,
+    Line = 1,
+    LineStrip = 2,
+    Triangle = 3,
+    TriangleStrip = 4,
+}
+
+#[repr(u64)]
+#[allow(non_camel_case_types)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+pub enum MTLIndexType {
+    UInt16 = 0,
+    UInt32 = 1,
+}
+
+#[repr(u64)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+pub enum MTLVisibilityResultMode {
+    Disabled = 0,
+    Boolean = 1,
+    Counting = 2,
+}
+
+#[repr(u64)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+pub enum MTLCullMode {
+    None = 0,
+    Front = 1,
+    Back = 2,
+}
+
+#[repr(u64)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+pub enum MTLWinding {
+    Clockwise = 0,
+    CounterClockwise = 1,
+}
+
+#[repr(u64)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+pub enum MTLDepthClipMode {
+    Clip = 0,
+    Clamp = 1,
+}
+
+#[repr(u64)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+pub enum MTLTriangleFillMode {
+    Fill = 0,
+    Lines = 1,
+}
+
+bitflags! {
+    #[allow(non_upper_case_globals)]
+    pub struct MTLBlitOption: NSUInteger {
+        const DepthFromDepthStencil   = 1 << 0;
+        const StencilFromDepthStencil = 1 << 1;
+        const RowLinearPVRTC          = 1 << 2;
+    }
+}
+
+#[repr(C)]
+#[derive(Copy, Clone, Debug)]
+pub struct MTLScissorRect {
+    pub x: NSUInteger,
+    pub y: NSUInteger,
+    pub width: NSUInteger,
+    pub height: NSUInteger,
+}
+
+#[repr(C)]
+#[derive(Copy, Clone, Debug)]
+pub struct MTLViewport {
+    pub originX: f64,
+    pub originY: f64,
+    pub width: f64,
+    pub height: f64,
+    pub znear: f64,
+    pub zfar: f64,
+}
+
+#[repr(C)]
+#[derive(Copy, Clone, Debug)]
+pub struct MTLDrawPrimitivesIndirectArguments {
+    pub vertexCount: u32,
+    pub instanceCount: u32,
+    pub vertexStart: u32,
+    pub baseInstance: u32,
+}
+
+#[repr(C)]
+#[derive(Copy, Clone, Debug)]
+pub struct MTLDrawIndexedPrimitivesIndirectArguments {
+    pub indexCount: u32,
+    pub instanceCount: u32,
+    pub indexStart: u32,
+    pub baseVertex: i32,
+    pub baseInstance: u32,
+}
+
+#[repr(C)]
+#[derive(Copy, Clone, Debug)]
+pub struct VertexAmplificationViewMapping {
+    pub renderTargetArrayIndexOffset: u32,
+    pub viewportArrayIndexOffset: u32,
+}
+
+pub enum MTLCommandEncoder {}
+
+foreign_obj_type! {
+    type CType = MTLCommandEncoder;
+    pub struct CommandEncoder;
+    pub struct CommandEncoderRef;
+}
+
+impl CommandEncoderRef {
+    pub fn label(&self) -> &str {
+        unsafe {
+            let label = msg_send![self, label];
+            crate::nsstring_as_str(label)
+        }
+    }
+
+    pub fn set_label(&self, label: &str) {
+        unsafe {
+            let nslabel = crate::nsstring_from_str(label);
+            msg_send![self, setLabel: nslabel]
+        }
+    }
+
+    pub fn end_encoding(&self) {
+        unsafe { msg_send![self, endEncoding] }
+    }
+
+    pub fn insert_debug_signpost(&self, name: &str) {
+        unsafe {
+            let nslabel = crate::nsstring_from_str(name);
+            msg_send![self, insertDebugSignpost: nslabel]
+        }
+    }
+
+    pub fn push_debug_group(&self, name: &str) {
+        unsafe {
+            let nslabel = crate::nsstring_from_str(name);
+            msg_send![self, pushDebugGroup: nslabel]
+        }
+    }
+
+    pub fn pop_debug_group(&self) {
+        unsafe { msg_send![self, popDebugGroup] }
+    }
+}
+
+pub enum MTLParallelRenderCommandEncoder {}
+
+foreign_obj_type! {
+    type CType = MTLParallelRenderCommandEncoder;
+    pub struct ParallelRenderCommandEncoder;
+    pub struct ParallelRenderCommandEncoderRef;
+    type ParentType = CommandEncoderRef;
+}
+
+impl ParallelRenderCommandEncoderRef {
+    pub fn render_command_encoder(&self) -> &RenderCommandEncoderRef {
+        unsafe { msg_send![self, renderCommandEncoder] }
+    }
+}
+
+pub enum MTLRenderCommandEncoder {}
+
+foreign_obj_type! {
+    type CType = MTLRenderCommandEncoder;
+    pub struct RenderCommandEncoder;
+    pub struct RenderCommandEncoderRef;
+    type ParentType = CommandEncoderRef;
+}
+
+impl RenderCommandEncoderRef {
+    pub fn set_render_pipeline_state(&self, pipeline_state: &RenderPipelineStateRef) {
+        unsafe { msg_send![self, setRenderPipelineState: pipeline_state] }
+    }
+
+    pub fn set_viewport(&self, viewport: MTLViewport) {
+        unsafe { msg_send![self, setViewport: viewport] }
+    }
+
+    pub fn set_front_facing_winding(&self, winding: MTLWinding) {
+        unsafe { msg_send![self, setFrontFacingWinding: winding] }
+    }
+
+    pub fn set_cull_mode(&self, mode: MTLCullMode) {
+        unsafe { msg_send![self, setCullMode: mode] }
+    }
+
+    pub fn set_depth_clip_mode(&self, mode: MTLDepthClipMode) {
+        unsafe { msg_send![self, setDepthClipMode: mode] }
+    }
+
+    pub fn set_depth_bias(&self, bias: f32, scale: f32, clamp: f32) {
+        unsafe {
+            msg_send![self, setDepthBias:bias
+                              slopeScale:scale
+                                   clamp:clamp]
+        }
+    }
+
+    pub fn set_scissor_rect(&self, rect: MTLScissorRect) {
+        unsafe { msg_send![self, setScissorRect: rect] }
+    }
+
+    pub fn set_triangle_fill_mode(&self, mode: MTLTriangleFillMode) {
+        unsafe { msg_send![self, setTriangleFillMode: mode] }
+    }
+
+    pub fn set_blend_color(&self, red: f32, green: f32, blue: f32, alpha: f32) {
+        unsafe {
+            msg_send![self, setBlendColorRed:red
+                                         green:green
+                                          blue:blue
+                                         alpha:alpha]
+        }
+    }
+
+    pub fn set_depth_stencil_state(&self, depth_stencil_state: &DepthStencilStateRef) {
+        unsafe { msg_send![self, setDepthStencilState: depth_stencil_state] }
+    }
+
+    pub fn set_stencil_reference_value(&self, value: u32) {
+        unsafe { msg_send![self, setStencilReferenceValue: value] }
+    }
+
+    pub fn set_stencil_front_back_reference_value(&self, front: u32, back: u32) {
+        unsafe {
+            msg_send![self, setStencilFrontReferenceValue:front
+                                       backReferenceValue:back]
+        }
+    }
+
+    pub fn set_visibility_result_mode(&self, mode: MTLVisibilityResultMode, offset: NSUInteger) {
+        unsafe {
+            msg_send![self, setVisibilityResultMode:mode
+                                             offset:offset]
+        }
+    }
+
+    pub fn set_vertex_amplification_count(
+        &self,
+        count: NSUInteger,
+        view_mappings: Option<&[VertexAmplificationViewMapping]>,
+    ) {
+        unsafe {
+            msg_send! [self, setVertexAmplificationCount: count viewMappings: view_mappings.map_or(std::ptr::null(), |vm| vm.as_ptr())]
+        }
+    }
+
+    // Specifying Resources for a Vertex Shader Function
+
+    pub fn set_vertex_bytes(
+        &self,
+        index: NSUInteger,
+        length: NSUInteger,
+        bytes: *const std::ffi::c_void,
+    ) {
+        unsafe {
+            msg_send![self,
+                setVertexBytes:bytes
+                length:length
+                atIndex:index
+            ]
+        }
+    }
+
+    pub fn set_vertex_buffer(
+        &self,
+        index: NSUInteger,
+        buffer: Option<&BufferRef>,
+        offset: NSUInteger,
+    ) {
+        unsafe {
+            msg_send![self,
+                setVertexBuffer:buffer
+                offset:offset
+                atIndex:index
+            ]
+        }
+    }
+
+    pub fn set_vertex_buffer_offset(&self, index: NSUInteger, offset: NSUInteger) {
+        unsafe {
+            msg_send![self,
+                setVertexBufferOffset:offset
+                atIndex:index
+            ]
+        }
+    }
+
+    pub fn set_vertex_buffers(
+        &self,
+        start_index: NSUInteger,
+        data: &[Option<&BufferRef>],
+        offsets: &[NSUInteger],
+    ) {
+        debug_assert_eq!(offsets.len(), data.len());
+        unsafe {
+            msg_send![self,
+                setVertexBuffers: data.as_ptr()
+                offsets: offsets.as_ptr()
+                withRange: NSRange {
+                    location: start_index,
+                    length: data.len() as _,
+                }
+            ]
+        }
+    }
+
+    pub fn set_vertex_texture(&self, index: NSUInteger, texture: Option<&TextureRef>) {
+        unsafe {
+            msg_send![self,
+                setVertexTexture:texture
+                atIndex:index
+            ]
+        }
+    }
+
+    pub fn set_vertex_textures(&self, start_index: NSUInteger, data: &[Option<&TextureRef>]) {
+        unsafe {
+            msg_send![self,
+                setVertexTextures: data.as_ptr()
+                withRange: NSRange {
+                    location: start_index,
+                    length: data.len() as _,
+                }
+            ]
+        }
+    }
+
+    pub fn set_vertex_sampler_state(&self, index: NSUInteger, sampler: Option<&SamplerStateRef>) {
+        unsafe {
+            msg_send![self,
+                setVertexSamplerState:sampler
+                atIndex:index
+            ]
+        }
+    }
+
+    pub fn set_vertex_sampler_states(
+        &self,
+        start_index: NSUInteger,
+        data: &[Option<&SamplerStateRef>],
+    ) {
+        unsafe {
+            msg_send![self,
+                setVertexSamplerStates: data.as_ptr()
+                withRange: NSRange {
+                    location: start_index,
+                    length: data.len() as _,
+                }
+            ]
+        }
+    }
+
+    pub fn set_vertex_sampler_state_with_lod(
+        &self,
+        index: NSUInteger,
+        sampler: Option<&SamplerStateRef>,
+        lod_clamp: Range<f32>,
+    ) {
+        unsafe {
+            msg_send![self,
+                setVertexSamplerState:sampler
+                lodMinClamp:lod_clamp.start
+                lodMaxClamp:lod_clamp.end
+                atIndex:index
+            ]
+        }
+    }
+
+    // Specifying Resources for a Fragment Shader Function
+
+    pub fn set_fragment_bytes(
+        &self,
+        index: NSUInteger,
+        length: NSUInteger,
+        bytes: *const std::ffi::c_void,
+    ) {
+        unsafe {
+            msg_send![self,
+                setFragmentBytes:bytes
+                length:length
+                atIndex:index
+            ]
+        }
+    }
+
+    pub fn set_fragment_buffer(
+        &self,
+        index: NSUInteger,
+        buffer: Option<&BufferRef>,
+        offset: NSUInteger,
+    ) {
+        unsafe {
+            msg_send![self,
+                setFragmentBuffer:buffer
+                offset:offset
+                atIndex:index
+            ]
+        }
+    }
+
+    pub fn set_fragment_buffer_offset(&self, index: NSUInteger, offset: NSUInteger) {
+        unsafe {
+            msg_send![self,
+                setFragmentBufferOffset:offset
+                atIndex:index
+            ]
+        }
+    }
+
+    pub fn set_fragment_buffers(
+        &self,
+        start_index: NSUInteger,
+        data: &[Option<&BufferRef>],
+        offsets: &[NSUInteger],
+    ) {
+        debug_assert_eq!(offsets.len(), data.len());
+        unsafe {
+            msg_send![self,
+                setFragmentBuffers: data.as_ptr()
+                offsets: offsets.as_ptr()
+                withRange: NSRange {
+                    location: start_index,
+                    length: data.len() as _,
+                }
+            ]
+        }
+    }
+
+    pub fn set_fragment_texture(&self, index: NSUInteger, texture: Option<&TextureRef>) {
+        unsafe {
+            msg_send![self,
+                setFragmentTexture:texture
+                atIndex:index
+            ]
+        }
+    }
+
+    pub fn set_fragment_textures(&self, start_index: NSUInteger, data: &[Option<&TextureRef>]) {
+        unsafe {
+            msg_send![self,
+                setFragmentTextures: data.as_ptr()
+                withRange: NSRange {
+                    location: start_index,
+                    length: data.len() as _,
+                }
+            ]
+        }
+    }
+
+    pub fn set_fragment_sampler_state(&self, index: NSUInteger, sampler: Option<&SamplerStateRef>) {
+        unsafe {
+            msg_send![self, setFragmentSamplerState:sampler
+                                            atIndex:index]
+        }
+    }
+
+    pub fn set_fragment_sampler_states(
+        &self,
+        start_index: NSUInteger,
+        data: &[Option<&SamplerStateRef>],
+    ) {
+        unsafe {
+            msg_send![self,
+                setFragmentSamplerStates: data.as_ptr()
+                withRange: NSRange {
+                    location: start_index,
+                    length: data.len() as _,
+                }
+            ]
+        }
+    }
+
+    pub fn set_fragment_sampler_state_with_lod(
+        &self,
+        index: NSUInteger,
+        sampler: Option<&SamplerStateRef>,
+        lod_clamp: Range<f32>,
+    ) {
+        unsafe {
+            msg_send![self,
+                setFragmentSamplerState:sampler
+                lodMinClamp:lod_clamp.start
+                lodMaxClamp:lod_clamp.end
+                atIndex:index
+            ]
+        }
+    }
+
+    // Drawing Geometric Primitives
+
+    pub fn draw_primitives(
+        &self,
+        primitive_type: MTLPrimitiveType,
+        vertex_start: NSUInteger,
+        vertex_count: NSUInteger,
+    ) {
+        unsafe {
+            msg_send![self,
+                drawPrimitives: primitive_type
+                vertexStart: vertex_start
+                vertexCount: vertex_count
+            ]
+        }
+    }
+
+    pub fn draw_primitives_instanced(
+        &self,
+        primitive_type: MTLPrimitiveType,
+        vertex_start: NSUInteger,
+        vertex_count: NSUInteger,
+        instance_count: NSUInteger,
+    ) {
+        unsafe {
+            msg_send![self,
+                drawPrimitives: primitive_type
+                vertexStart: vertex_start
+                vertexCount: vertex_count
+                instanceCount: instance_count
+            ]
+        }
+    }
+
+    pub fn draw_primitives_instanced_base_instance(
+        &self,
+        primitive_type: MTLPrimitiveType,
+        vertex_start: NSUInteger,
+        vertex_count: NSUInteger,
+        instance_count: NSUInteger,
+        base_instance: NSUInteger,
+    ) {
+        unsafe {
+            msg_send![self,
+                drawPrimitives: primitive_type
+                vertexStart: vertex_start
+                vertexCount: vertex_count
+                instanceCount: instance_count
+                baseInstance: base_instance
+            ]
+        }
+    }
+
+    pub fn draw_primitives_indirect(
+        &self,
+        primitive_type: MTLPrimitiveType,
+        indirect_buffer: &BufferRef,
+        indirect_buffer_offset: NSUInteger,
+    ) {
+        unsafe {
+            msg_send![self,
+                drawPrimitives: primitive_type
+                indirectBuffer: indirect_buffer
+                indirectBufferOffset: indirect_buffer_offset
+            ]
+        }
+    }
+
+    pub fn draw_indexed_primitives(
+        &self,
+        primitive_type: MTLPrimitiveType,
+        index_count: NSUInteger,
+        index_type: MTLIndexType,
+        index_buffer: &BufferRef,
+        index_buffer_offset: NSUInteger,
+    ) {
+        unsafe {
+            msg_send![self,
+                drawIndexedPrimitives: primitive_type
+                indexCount: index_count
+                indexType: index_type
+                indexBuffer: index_buffer
+                indexBufferOffset: index_buffer_offset
+            ]
+        }
+    }
+
+    pub fn draw_indexed_primitives_instanced(
+        &self,
+        primitive_type: MTLPrimitiveType,
+        index_count: NSUInteger,
+        index_type: MTLIndexType,
+        index_buffer: &BufferRef,
+        index_buffer_offset: NSUInteger,
+        instance_count: NSUInteger,
+    ) {
+        unsafe {
+            msg_send![self,
+                drawIndexedPrimitives: primitive_type
+                indexCount: index_count
+                indexType: index_type
+                indexBuffer: index_buffer
+                indexBufferOffset: index_buffer_offset
+                instanceCount: instance_count
+            ]
+        }
+    }
+
+    pub fn draw_indexed_primitives_instanced_base_instance(
+        &self,
+        primitive_type: MTLPrimitiveType,
+        index_count: NSUInteger,
+        index_type: MTLIndexType,
+        index_buffer: &BufferRef,
+        index_buffer_offset: NSUInteger,
+        instance_count: NSUInteger,
+        base_vertex: NSInteger,
+        base_instance: NSUInteger,
+    ) {
+        unsafe {
+            msg_send![self,
+                drawIndexedPrimitives: primitive_type
+                indexCount: index_count
+                indexType: index_type
+                indexBuffer: index_buffer
+                indexBufferOffset: index_buffer_offset
+                instanceCount: instance_count
+                baseVertex: base_vertex
+                baseInstance: base_instance
+            ]
+        }
+    }
+
+    pub fn draw_indexed_primitives_indirect(
+        &self,
+        primitive_type: MTLPrimitiveType,
+        index_type: MTLIndexType,
+        index_buffer: &BufferRef,
+        index_buffer_offset: NSUInteger,
+        indirect_buffer: &BufferRef,
+        indirect_buffer_offset: NSUInteger,
+    ) {
+        unsafe {
+            msg_send![self,
+                drawIndexedPrimitives: primitive_type
+                indexType: index_type
+                indexBuffer: index_buffer
+                indexBufferOffset: index_buffer_offset
+                indirectBuffer: indirect_buffer
+                indirectBufferOffset: indirect_buffer_offset
+            ]
+        }
+    }
+
+    // TODO: more draws
+    // fn setVertexBufferOffset_atIndex(self, offset: NSUInteger, index: NSUInteger);
+    // fn setVertexBuffers_offsets_withRange(self, buffers: *const id, offsets: *const NSUInteger, range: NSRange);
+    // fn setVertexSamplerStates_lodMinClamps_lodMaxClamps_withRange(self, samplers: *const id, lodMinClamps: *const f32, lodMaxClamps: *const f32, range: NSRange);
+
+    pub fn use_resource(&self, resource: &ResourceRef, usage: MTLResourceUsage) {
+        unsafe {
+            msg_send![self, useResource:resource
+                                  usage:usage]
+        }
+    }
+
+    pub fn use_heap(&self, heap: &HeapRef) {
+        unsafe { msg_send![self, useHeap: heap] }
+    }
+}
+
+pub enum MTLBlitCommandEncoder {}
+
+foreign_obj_type! {
+    type CType = MTLBlitCommandEncoder;
+    pub struct BlitCommandEncoder;
+    pub struct BlitCommandEncoderRef;
+    type ParentType = CommandEncoderRef;
+}
+
+impl BlitCommandEncoderRef {
+    pub fn synchronize_resource(&self, resource: &ResourceRef) {
+        unsafe { msg_send![self, synchronizeResource: resource] }
+    }
+
+    pub fn fill_buffer(&self, destination_buffer: &BufferRef, range: NSRange, value: u8) {
+        unsafe {
+            msg_send![self,
+                fillBuffer: destination_buffer
+                range: range
+                value: value
+            ]
+        }
+    }
+
+    pub fn copy_from_buffer(
+        &self,
+        source_buffer: &BufferRef,
+        source_offset: NSUInteger,
+        destination_buffer: &BufferRef,
+        destination_offset: NSUInteger,
+        size: NSUInteger,
+    ) {
+        unsafe {
+            msg_send![self,
+                copyFromBuffer: source_buffer
+                sourceOffset: source_offset
+                toBuffer: destination_buffer
+                destinationOffset: destination_offset
+                size: size
+            ]
+        }
+    }
+
+    pub fn copy_from_texture(
+        &self,
+        source_texture: &TextureRef,
+        source_slice: NSUInteger,
+        source_level: NSUInteger,
+        source_origin: MTLOrigin,
+        source_size: MTLSize,
+        destination_texture: &TextureRef,
+        destination_slice: NSUInteger,
+        destination_level: NSUInteger,
+        destination_origin: MTLOrigin,
+    ) {
+        unsafe {
+            msg_send![self,
+                copyFromTexture: source_texture
+                sourceSlice: source_slice
+                sourceLevel: source_level
+                sourceOrigin: source_origin
+                sourceSize: source_size
+                toTexture: destination_texture
+                destinationSlice: destination_slice
+                destinationLevel: destination_level
+                destinationOrigin: destination_origin
+            ]
+        }
+    }
+
+    pub fn copy_from_buffer_to_texture(
+        &self,
+        source_buffer: &BufferRef,
+        source_offset: NSUInteger,
+        source_bytes_per_row: NSUInteger,
+        source_bytes_per_image: NSUInteger,
+        source_size: MTLSize,
+        destination_texture: &TextureRef,
+        destination_slice: NSUInteger,
+        destination_level: NSUInteger,
+        destination_origin: MTLOrigin,
+        options: MTLBlitOption,
+    ) {
+        unsafe {
+            msg_send![self,
+                copyFromBuffer: source_buffer
+                sourceOffset: source_offset
+                sourceBytesPerRow: source_bytes_per_row
+                sourceBytesPerImage: source_bytes_per_image
+                sourceSize: source_size
+                toTexture: destination_texture
+                destinationSlice: destination_slice
+                destinationLevel: destination_level
+                destinationOrigin: destination_origin
+                options: options
+            ]
+        }
+    }
+
+    pub fn copy_from_texture_to_buffer(
+        &self,
+        source_texture: &TextureRef,
+        source_slice: NSUInteger,
+        source_level: NSUInteger,
+        source_origin: MTLOrigin,
+        source_size: MTLSize,
+        destination_buffer: &BufferRef,
+        destination_offset: NSUInteger,
+        destination_bytes_per_row: NSUInteger,
+        destination_bytes_per_image: NSUInteger,
+        options: MTLBlitOption,
+    ) {
+        unsafe {
+            msg_send![self,
+                copyFromTexture: source_texture
+                sourceSlice: source_slice
+                sourceLevel: source_level
+                sourceOrigin: source_origin
+                sourceSize: source_size
+                toBuffer: destination_buffer
+                destinationOffset: destination_offset
+                destinationBytesPerRow: destination_bytes_per_row
+                destinationBytesPerImage: destination_bytes_per_image
+                options: options
+            ]
+        }
+    }
+
+    pub fn optimize_contents_for_gpu_access(&self, texture: &TextureRef) {
+        unsafe { msg_send![self, optimizeContentsForGPUAccess: texture] }
+    }
+
+    pub fn optimize_contents_for_gpu_access_slice_level(
+        &self,
+        texture: &TextureRef,
+        slice: NSUInteger,
+        level: NSUInteger,
+    ) {
+        unsafe {
+            msg_send![self,
+                optimizeContentsForGPUAccess: texture
+                slice: slice
+                level: level
+            ]
+        }
+    }
+
+    pub fn optimize_contents_for_cpu_access(&self, texture: &TextureRef) {
+        unsafe { msg_send![self, optimizeContentsForCPUAccess: texture] }
+    }
+
+    pub fn optimize_contents_for_cpu_access_slice_level(
+        &self,
+        texture: &TextureRef,
+        slice: NSUInteger,
+        level: NSUInteger,
+    ) {
+        unsafe {
+            msg_send![self,
+                optimizeContentsForCPUAccess: texture
+                slice: slice
+                level: level
+            ]
+        }
+    }
+}
+
+pub enum MTLComputeCommandEncoder {}
+
+foreign_obj_type! {
+    type CType = MTLComputeCommandEncoder;
+    pub struct ComputeCommandEncoder;
+    pub struct ComputeCommandEncoderRef;
+    type ParentType = CommandEncoderRef;
+}
+
+impl ComputeCommandEncoderRef {
+    pub fn set_compute_pipeline_state(&self, state: &ComputePipelineStateRef) {
+        unsafe { msg_send![self, setComputePipelineState: state] }
+    }
+
+    pub fn set_buffer(&self, index: NSUInteger, buffer: Option<&BufferRef>, offset: NSUInteger) {
+        unsafe { msg_send![self, setBuffer:buffer offset:offset atIndex:index] }
+    }
+
+    pub fn set_buffers(
+        &self,
+        start_index: NSUInteger,
+        data: &[Option<&BufferRef>],
+        offsets: &[NSUInteger],
+    ) {
+        debug_assert_eq!(offsets.len(), data.len());
+        unsafe {
+            msg_send![self,
+                setBuffers: data.as_ptr()
+                offsets: offsets.as_ptr()
+                withRange: NSRange {
+                    location: start_index,
+                    length: data.len() as _,
+                }
+            ]
+        }
+    }
+
+    pub fn set_texture(&self, index: NSUInteger, texture: Option<&TextureRef>) {
+        unsafe {
+            msg_send![self,
+                setTexture:texture
+                atIndex:index
+            ]
+        }
+    }
+
+    pub fn set_textures(&self, start_index: NSUInteger, data: &[Option<&TextureRef>]) {
+        unsafe {
+            msg_send![self,
+                setTextures: data.as_ptr()
+                withRange: NSRange {
+                    location: start_index,
+                    length: data.len() as _,
+                }
+            ]
+        }
+    }
+
+    pub fn set_sampler_state(&self, index: NSUInteger, sampler: Option<&SamplerStateRef>) {
+        unsafe {
+            msg_send![self,
+                setSamplerState:sampler
+                atIndex:index
+            ]
+        }
+    }
+
+    pub fn set_sampler_states(&self, start_index: NSUInteger, data: &[Option<&SamplerStateRef>]) {
+        unsafe {
+            msg_send![self,
+                setSamplerStates: data.as_ptr()
+                withRange: NSRange {
+                    location: start_index,
+                    length: data.len() as _,
+                }
+            ]
+        }
+    }
+
+    pub fn set_sampler_state_with_lod(
+        &self,
+        index: NSUInteger,
+        sampler: Option<&SamplerStateRef>,
+        lod_clamp: Range<f32>,
+    ) {
+        unsafe {
+            msg_send![self,
+                setSamplerState:sampler
+                lodMinClamp:lod_clamp.start
+                lodMaxClamp:lod_clamp.end
+                atIndex:index
+            ]
+        }
+    }
+
+    pub fn set_bytes(&self, index: NSUInteger, length: NSUInteger, bytes: *const std::ffi::c_void) {
+        unsafe {
+            msg_send![self,
+                setBytes: bytes
+                length: length
+                atIndex: index
+            ]
+        }
+    }
+
+    pub fn dispatch_thread_groups(
+        &self,
+        thread_groups_count: MTLSize,
+        threads_per_thread_group: MTLSize,
+    ) {
+        unsafe {
+            msg_send![self,
+                dispatchThreadgroups:thread_groups_count
+                threadsPerThreadgroup:threads_per_thread_group
+            ]
+        }
+    }
+
+    pub fn dispatch_thread_groups_indirect(
+        &self,
+        buffer: &BufferRef,
+        offset: NSUInteger,
+        threads_per_thread_group: MTLSize,
+    ) {
+        unsafe {
+            msg_send![self,
+                dispatchThreadgroupsWithIndirectBuffer:buffer
+                indirectBufferOffset:offset
+                threadsPerThreadgroup:threads_per_thread_group
+            ]
+        }
+    }
+
+    pub fn use_resource(&self, resource: &ResourceRef, usage: MTLResourceUsage) {
+        unsafe {
+            msg_send![self,
+                useResource:resource
+                usage:usage
+            ]
+        }
+    }
+
+    pub fn use_heap(&self, heap: &HeapRef) {
+        unsafe { msg_send![self, useHeap: heap] }
+    }
+}
+
+pub enum MTLArgumentEncoder {}
+
+foreign_obj_type! {
+    type CType = MTLArgumentEncoder;
+    pub struct ArgumentEncoder;
+    pub struct ArgumentEncoderRef;
+}
+
+impl ArgumentEncoderRef {
+    pub fn encoded_length(&self) -> NSUInteger {
+        unsafe { msg_send![self, encodedLength] }
+    }
+
+    pub fn alignment(&self) -> NSUInteger {
+        unsafe { msg_send![self, alignment] }
+    }
+
+    pub fn set_argument_buffer(&self, buffer: &BufferRef, offset: NSUInteger) {
+        unsafe {
+            msg_send![self,
+                setArgumentBuffer: buffer
+                offset: offset
+            ]
+        }
+    }
+
+    pub fn set_argument_buffer_to_element(
+        &self,
+        array_element: NSUInteger,
+        buffer: &BufferRef,
+        offset: NSUInteger,
+    ) {
+        unsafe {
+            msg_send![self,
+                setArgumentBuffer: buffer
+                startOffset: offset
+                arrayElement: array_element
+            ]
+        }
+    }
+
+    pub fn set_buffer(&self, at_index: NSUInteger, buffer: &BufferRef, offset: NSUInteger) {
+        unsafe {
+            msg_send![self,
+                setBuffer: buffer
+                offset: offset
+                atIndex: at_index
+            ]
+        }
+    }
+
+    pub fn set_buffers(
+        &self,
+        start_index: NSUInteger,
+        data: &[&BufferRef],
+        offsets: &[NSUInteger],
+    ) {
+        assert_eq!(offsets.len(), data.len());
+        unsafe {
+            msg_send![self,
+                setBuffers: data.as_ptr()
+                offsets: offsets.as_ptr()
+                withRange: NSRange {
+                    location: start_index,
+                    length: data.len() as _,
+                }
+            ]
+        }
+    }
+
+    pub fn set_texture(&self, at_index: NSUInteger, texture: &TextureRef) {
+        unsafe {
+            msg_send![self,
+                setTexture: texture
+                atIndex: at_index
+            ]
+        }
+    }
+
+    pub fn set_textures(&self, start_index: NSUInteger, data: &[&TextureRef]) {
+        unsafe {
+            msg_send![self,
+                setTextures: data.as_ptr()
+                withRange: NSRange {
+                    location: start_index,
+                    length: data.len() as _,
+                }
+            ]
+        }
+    }
+
+    pub fn set_sampler_state(&self, at_index: NSUInteger, sampler_state: &SamplerStateRef) {
+        unsafe {
+            msg_send![self,
+                setSamplerState: sampler_state
+                atIndex: at_index
+            ]
+        }
+    }
+
+    pub fn set_sampler_states(&self, start_index: NSUInteger, data: &[&SamplerStateRef]) {
+        unsafe {
+            msg_send![self,
+                setSamplerStates: data.as_ptr()
+                withRange: NSRange {
+                    location: start_index,
+                    length: data.len() as _,
+                }
+            ]
+        }
+    }
+
+    pub fn constant_data(&self, at_index: NSUInteger) -> *mut std::ffi::c_void {
+        unsafe { msg_send![self, constantDataAtIndex: at_index] }
+    }
+
+    pub fn new_argument_encoder_for_buffer(&self, index: NSUInteger) -> ArgumentEncoder {
+        unsafe {
+            let ptr = msg_send![self, newArgumentEncoderForBufferAtIndex: index];
+            ArgumentEncoder::from_ptr(ptr)
+        }
+    }
+}
diff --git a/third_party/rust/metal/src/heap.rs b/third_party/rust/metal/src/heap.rs
new file mode 100644
index 0000000000..9adb51c681
--- /dev/null
+++ b/third_party/rust/metal/src/heap.rs
@@ -0,0 +1,110 @@
+// Copyright 2016 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+use super::*;
+
+use cocoa_foundation::foundation::NSUInteger;
+
+pub enum MTLHeap {}
+
+foreign_obj_type! {
+    type CType = MTLHeap;
+    pub struct Heap;
+    pub struct HeapRef;
+}
+
+impl HeapRef {
+    pub fn cpu_cache_mode(&self) -> MTLCPUCacheMode {
+        unsafe { msg_send![self, cpuCacheMode] }
+    }
+
+    pub fn storage_mode(&self) -> MTLStorageMode {
+        unsafe { msg_send![self, storageMode] }
+    }
+
+    pub fn set_purgeable_state(&self, state: MTLPurgeableState) -> MTLPurgeableState {
+        unsafe { msg_send![self, setPurgeableState: state] }
+    }
+
+    pub fn size(&self) -> NSUInteger {
+        unsafe { msg_send![self, size] }
+    }
+
+    pub fn used_size(&self) -> NSUInteger {
+        unsafe { msg_send![self, usedSize] }
+    }
+
+    pub fn max_available_size(&self, alignment: NSUInteger) -> NSUInteger {
+        unsafe { msg_send![self, maxAvailableSizeWithAlignment: alignment] }
+    }
+
+    pub fn new_buffer(&self, length: u64, options: MTLResourceOptions) -> Option<Buffer> {
+        unsafe {
+            let ptr: *mut MTLBuffer = msg_send![self, newBufferWithLength:length
+                                                                  options:options];
+            if !ptr.is_null() {
+                Some(Buffer::from_ptr(ptr))
+            } else {
+                None
+            }
+        }
+    }
+
+    pub fn new_texture(&self, descriptor: &TextureDescriptorRef) -> Option<Texture> {
+        unsafe {
+            let ptr: *mut MTLTexture = msg_send![self, newTextureWithDescriptor: descriptor];
+            if !ptr.is_null() {
+                Some(Texture::from_ptr(ptr))
+            } else {
+                None
+            }
+        }
+    }
+}
+
+pub enum MTLHeapDescriptor {}
+
+foreign_obj_type! {
+    type CType = MTLHeapDescriptor;
+    pub struct HeapDescriptor;
+    pub struct HeapDescriptorRef;
+}
+
+impl HeapDescriptor {
+    pub fn new() -> Self {
+        unsafe {
+            let class = class!(MTLHeapDescriptor);
+            msg_send![class, new]
+        }
+    }
+}
+
+impl HeapDescriptorRef {
+    pub fn cpu_cache_mode(&self) -> MTLCPUCacheMode {
+        unsafe { msg_send![self, cpuCacheMode] }
+    }
+
+    pub fn set_cpu_cache_mode(&self, mode: MTLCPUCacheMode) {
+        unsafe { msg_send![self, setCpuCacheMode: mode] }
+    }
+
+    pub fn storage_mode(&self) -> MTLStorageMode {
+        unsafe { msg_send![self, storageMode] }
+    }
+
+    pub fn set_storage_mode(&self, mode: MTLStorageMode) {
+        unsafe { msg_send![self, setStorageMode: mode] }
+    }
+
+    pub fn size(&self) -> NSUInteger {
+        unsafe { msg_send![self, size] }
+    }
+
+    pub fn set_size(&self, size: NSUInteger) {
+        unsafe { msg_send![self, setSize: size] }
+    }
+}
diff --git a/third_party/rust/metal/src/indirect_encoder.rs b/third_party/rust/metal/src/indirect_encoder.rs
new file mode 100644
index 0000000000..3f08ead9bc
--- /dev/null
+++ b/third_party/rust/metal/src/indirect_encoder.rs
@@ -0,0 +1,349 @@
+use super::*;
+
+use cocoa_foundation::foundation::{NSRange, NSUInteger};
+
+bitflags! {
+    #[allow(non_upper_case_globals)]
+    pub struct MTLIndirectCommandType: NSUInteger {
+        const Draw                      = 1 << 0;
+        const DrawIndexed               = 1 << 1;
+        const DrawPatches               = 1 << 2;
+        const DrawIndexedPatches        = 1 << 3;
+        const ConcurrentDispatch        = 1 << 4;
+        const ConcurrentDispatchThreads = 1 << 5;
+    }
+}
+
+pub enum MTLIndirectCommandBufferDescriptor {}
+
+foreign_obj_type! {
+    type CType = MTLIndirectCommandBufferDescriptor;
+    pub struct IndirectCommandBufferDescriptor;
+    pub struct IndirectCommandBufferDescriptorRef;
+}
+
+impl IndirectCommandBufferDescriptorRef {
+    pub fn command_types(&self) -> MTLIndirectCommandType {
+        unsafe { msg_send![self, commandTypes] }
+    }
+
+    pub fn set_command_types(&self, types: MTLIndirectCommandType) {
+        unsafe { msg_send![self, setCommandTypes: types] }
+    }
+
+    pub fn inherit_buffer(&self) -> bool {
+        unsafe {
+            match msg_send![self, inheritBuffer] {
+                YES => true,
+                NO => false,
+                _ => unreachable!(),
+            }
+        }
+    }
+
+    pub fn set_inherit_buffer(&self, inherit: bool) {
+        unsafe { msg_send![self, setInheritBuffer: inherit] }
+    }
+
+    pub fn inherit_pipeline_state(&self) -> bool {
+        unsafe {
+            match msg_send![self, inheritPipelineState] {
+                YES => true,
+                NO => false,
+                _ => unreachable!(),
+            }
+        }
+    }
+
+    pub fn set_inherit_pipeline_state(&self, inherit: bool) {
+        unsafe { msg_send![self, setInheritPipelineState: inherit] }
+    }
+
+    pub fn max_vertex_buffer_bind_count(&self) -> NSUInteger {
+        unsafe { msg_send![self, maxVertexBufferBindCount] }
+    }
+
+    pub fn set_max_vertex_buffer_bind_count(&self, count: NSUInteger) {
+        unsafe { msg_send![self, setMaxVertexBufferBindCount: count] }
+    }
+
+    pub fn max_fragment_buffer_bind_count(&self) -> NSUInteger {
+        unsafe { msg_send![self, maxFragmentBufferBindCount] }
+    }
+
+    pub fn set_max_fragment_buffer_bind_count(&self, count: NSUInteger) {
+        unsafe { msg_send![self, setMaxFragmentBufferBindCount: count] }
+    }
+
+    pub fn max_kernel_buffer_bind_count(&self) -> NSUInteger {
+        unsafe { msg_send![self, maxKernelBufferBindCount] }
+    }
+
+    pub fn set_max_kernel_buffer_bind_count(&self, count: NSUInteger) {
+        unsafe { msg_send![self, setMaxKernelBufferBindCount: count] }
+    }
+}
+
+pub enum MTLIndirectCommandBuffer {}
+
+foreign_obj_type! {
+    type CType = MTLIndirectCommandBuffer;
+    pub struct IndirectCommandBuffer;
+    pub struct IndirectCommandBufferRef;
+    type ParentType = ResourceRef;
+}
+
+impl IndirectCommandBufferRef {
+    pub fn size(&self) -> NSUInteger {
+        unsafe { msg_send![self, size] }
+    }
+
+    pub fn indirect_render_command_at_index(&self, index: NSUInteger) -> &IndirectRenderCommandRef {
+        unsafe { msg_send![self, indirectRenderCommandAtIndex: index] }
+    }
+
+    pub fn indirect_compute_command_at_index(
+        &self,
+        index: NSUInteger,
+    ) -> &IndirectComputeCommandRef {
+        unsafe { msg_send![self, indirectComputeCommandAtIndex: index] }
+    }
+
+    pub fn reset_with_range(&self, range: NSRange) {
+        unsafe { msg_send![self, resetWithRange: range] }
+    }
+}
+
+pub enum MTLIndirectRenderCommand {}
+
+foreign_obj_type! {
+    type CType = MTLIndirectRenderCommand;
+    pub struct IndirectRenderCommand;
+    pub struct IndirectRenderCommandRef;
+}
+
+impl IndirectRenderCommandRef {
+    pub fn set_render_pipeline_state(&self, pipeline_state: &RenderPipelineStateRef) {
+        unsafe { msg_send![self, setRenderPipelineState: pipeline_state] }
+    }
+
+    pub fn set_vertex_buffer(
+        &self,
+        index: NSUInteger,
+        buffer: Option<&BufferRef>,
+        offset: NSUInteger,
+    ) {
+        unsafe {
+            msg_send![self,
+                setVertexBuffer: buffer
+                offset: offset
+                atIndex: index
+            ]
+        }
+    }
+
+    pub fn set_fragment_buffer(
+        &self,
+        index: NSUInteger,
+        buffer: Option<&BufferRef>,
+        offset: NSUInteger,
+    ) {
+        unsafe {
+            msg_send![self,
+                setFragmentBuffer:buffer
+                offset:offset
+                atIndex:index
+            ]
+        }
+    }
+
+    pub fn draw_primitives(
+        &self,
+        primitive_type: MTLPrimitiveType,
+        vertex_start: NSUInteger,
+        vertex_count: NSUInteger,
+        instance_count: NSUInteger,
+        base_instance: NSUInteger,
+    ) {
+        unsafe {
+            msg_send![self,
+                drawPrimitives: primitive_type
+                vertexStart: vertex_start
+                vertexCount: vertex_count
+                instanceCount: instance_count
+                baseInstance: base_instance
+            ]
+        }
+    }
+
+    pub fn draw_indexed_primitives(
+        &self,
+        primitive_type: MTLPrimitiveType,
+        index_count: NSUInteger,
+        index_type: MTLIndexType,
+        index_buffer: &BufferRef,
+        index_buffer_offset: NSUInteger,
+        instance_count: NSUInteger,
+        base_vertex: NSUInteger,
+        base_instance: NSUInteger,
+    ) {
+        unsafe {
+            msg_send![self,
+                drawIndexedPrimitives: primitive_type
+                indexCount: index_count
+                indexType: index_type
+                indexBuffer: index_buffer
+                indexBufferOffset: index_buffer_offset
+                instanceCount: instance_count
+                baseVertex: base_vertex
+                baseInstance: base_instance
+            ]
+        }
+    }
+
+    pub fn draw_patches(
+        &self,
+        number_of_patch_control_points: NSUInteger,
+        patch_start: NSUInteger,
+        patch_count: NSUInteger,
+        patch_index_buffer: &BufferRef,
+        patch_index_buffer_offset: NSUInteger,
+        instance_count: NSUInteger,
+        base_instance: NSUInteger,
+        tesselation_factor_buffer: &BufferRef,
+        tesselation_factor_buffer_offset: NSUInteger,
+        tesselation_factor_buffer_instance_stride: NSUInteger,
+    ) {
+        unsafe {
+            msg_send![self,
+                drawPatches: number_of_patch_control_points
+                patchStart: patch_start
+                patchCount: patch_count
+                patchIndexBuffer: patch_index_buffer
+                patchIndexBufferOffset: patch_index_buffer_offset
+                instanceCount: instance_count
+                baseInstance: base_instance
+                tessellationFactorBuffer: tesselation_factor_buffer
+                tessellationFactorBufferOffset: tesselation_factor_buffer_offset
+                tessellationFactorBufferInstanceStride: tesselation_factor_buffer_instance_stride
+            ]
+        }
+    }
+
+    pub fn draw_indexed_patches(
+        &self,
+        number_of_patch_control_points: NSUInteger,
+        patch_start: NSUInteger,
+        patch_count: NSUInteger,
+        patch_index_buffer: &BufferRef,
+        patch_index_buffer_offset: NSUInteger,
+        control_point_index_buffer: &BufferRef,
+        control_point_index_buffer_offset: NSUInteger,
+        instance_count: NSUInteger,
+        base_instance: NSUInteger,
+        tesselation_factor_buffer: &BufferRef,
+        tesselation_factor_buffer_offset: NSUInteger,
+        tesselation_factor_buffer_instance_stride: NSUInteger,
+    ) {
+        unsafe {
+            msg_send![self,
+                drawIndexedPatches: number_of_patch_control_points
+                patchStart: patch_start
+                patchCount: patch_count
+                patchIndexBuffer: patch_index_buffer
+                patchIndexBufferOffset: patch_index_buffer_offset
+                controlPointIndexBuffer: control_point_index_buffer
+                controlPointIndexBufferOffset: control_point_index_buffer_offset
+                instanceCount: instance_count
+                baseInstance: base_instance
+                tessellationFactorBuffer: tesselation_factor_buffer
+                tessellationFactorBufferOffset: tesselation_factor_buffer_offset
+                tessellationFactorBufferInstanceStride: tesselation_factor_buffer_instance_stride
+            ]
+        }
+    }
+
+    pub fn reset(&self) {
+        unsafe { msg_send![self, reset] }
+    }
+}
+
+pub enum MTLIndirectComputeCommand {}
+
+foreign_obj_type! {
+    type CType = MTLIndirectComputeCommand;
+    pub struct IndirectComputeCommand;
+    pub struct IndirectComputeCommandRef;
+}
+
+impl IndirectComputeCommandRef {
+    pub fn set_compute_pipeline_state(&self, state: &ComputePipelineStateRef) {
+        unsafe { msg_send![self, setComputePipelineState: state] }
+    }
+
+    pub fn set_kernel_buffer(
+        &self,
+        index: NSUInteger,
+        buffer: Option<&BufferRef>,
+        offset: NSUInteger,
+    ) {
+        unsafe {
+            msg_send![self,
+                setKernelBuffer: buffer
+                offset: offset
+                atIndex: index
+            ]
+        }
+    }
+
+    pub fn set_threadgroup_memory_length(&self, index: NSUInteger, length: NSUInteger) {
+        unsafe {
+            msg_send![self,
+                setThreadgroupMemoryLength: length
+                atIndex: index
+            ]
+        }
+    }
+
+    pub fn set_stage_in_region(&self, region: MTLRegion) {
+        unsafe { msg_send![self, setStageInRegion: region] }
+    }
+
+    pub fn set_barrier(&self) {
+        unsafe { msg_send![self, setBarrier] }
+    }
+
+    pub fn clear_barrier(&self) {
+        unsafe { msg_send![self, clearBarrier] }
+    }
+
+    pub fn concurrent_dispatch_threadgroups(
+        &self,
+        thread_groups_per_grid: MTLSize,
+        threads_per_threadgroup: MTLSize,
+    ) {
+        unsafe {
+            msg_send![self,
+                concurrentDispatchThreadgroups: thread_groups_per_grid
+                threadsPerThreadgroup: threads_per_threadgroup
+            ]
+        }
+    }
+
+    pub fn concurrent_dispatch_threads(
+        &self,
+        thread_groups_per_grid: MTLSize,
+        threads_per_threadgroup: MTLSize,
+    ) {
+        unsafe {
+            msg_send![self,
+                concurrentDispatchThreads: thread_groups_per_grid
+                threadsPerThreadgroup: threads_per_threadgroup
+            ]
+        }
+    }
+
+    pub fn reset(&self) {
+        unsafe { msg_send![self, reset] }
+    }
+}
diff --git a/third_party/rust/metal/src/lib.rs b/third_party/rust/metal/src/lib.rs
new file mode 100644
index 0000000000..e5833da57c
--- /dev/null
+++ b/third_party/rust/metal/src/lib.rs
@@ -0,0 +1,433 @@
+// Copyright 2017 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+#![allow(non_snake_case)]
+#![allow(non_upper_case_globals)]
+
+#[macro_use]
+extern crate bitflags;
+#[macro_use]
+extern crate log;
+#[macro_use]
+extern crate objc;
+#[macro_use]
+extern crate foreign_types;
+
+use std::borrow::{Borrow, ToOwned};
+use std::marker::PhantomData;
+use std::mem;
+use std::ops::Deref;
+use std::os::raw::c_void;
+
+use cocoa_foundation::foundation::NSUInteger;
+use foreign_types::ForeignType;
+use objc::runtime::{Object, BOOL, NO, YES};
+
+#[cfg(target_pointer_width = "64")]
+pub type CGFloat = f64;
+#[cfg(not(target_pointer_width = "64"))]
+pub type CGFloat = f32;
+
+#[repr(C)]
+#[derive(Clone, Copy, Debug, Default, PartialEq)]
+pub struct CGSize {
+    pub width: CGFloat,
+    pub height: CGFloat,
+}
+
+impl CGSize {
+    pub fn new(width: f64, height: f64) -> Self {
+        CGSize { width, height }
+    }
+}
+
+fn nsstring_as_str(nsstr: &objc::runtime::Object) -> &str {
+    let bytes = unsafe {
+        let bytes: *const std::os::raw::c_char = msg_send![nsstr, UTF8String];
+        bytes as *const u8
+    };
+    let len: NSUInteger = unsafe { msg_send![nsstr, length] };
+    unsafe {
+        let bytes = std::slice::from_raw_parts(bytes, len as usize);
+        std::str::from_utf8(bytes).unwrap()
+    }
+}
+
+fn nsstring_from_str(string: &str) -> *mut objc::runtime::Object {
+    const UTF8_ENCODING: usize = 4;
+
+    let cls = class!(NSString);
+    let bytes = string.as_ptr() as *const c_void;
+    unsafe {
+        let obj: *mut objc::runtime::Object = msg_send![cls, alloc];
+        let obj: *mut objc::runtime::Object = msg_send![
+            obj,
+            initWithBytes:bytes
+            length:string.len()
+            encoding:UTF8_ENCODING
+        ];
+        let _: *mut c_void = msg_send![obj, autorelease];
+        obj
+    }
+}
+
+macro_rules! foreign_obj_type {
+    {type CType = $raw_ident:ident;
+    pub struct $owned_ident:ident;
+    pub struct $ref_ident:ident;
+    type ParentType = $parent_ref:ident;
+    } => {
+        foreign_obj_type! {
+            type CType = $raw_ident;
+            pub struct $owned_ident;
+            pub struct $ref_ident;
+        }
+
+        impl ::std::ops::Deref for $ref_ident {
+            type Target = $parent_ref;
+
+            fn deref(&self) -> &$parent_ref {
+                unsafe { &*(self as *const $ref_ident as *const $parent_ref)  }
+            }
+        }
+    };
+    {type CType = $raw_ident:ident;
+    pub struct $owned_ident:ident;
+    pub struct $ref_ident:ident;
+    } => {
+        foreign_type! {
+            type CType = $raw_ident;
+            fn drop = crate::obj_drop;
+            fn clone = crate::obj_clone;
+            pub struct $owned_ident;
+            pub struct $ref_ident;
+        }
+
+        unsafe impl ::objc::Message for $raw_ident {
+        }
+        unsafe impl ::objc::Message for $ref_ident {
+        }
+
+        impl ::std::fmt::Debug for $ref_ident {
+            fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
+                unsafe {
+                    let string: *mut ::objc::runtime::Object = msg_send![self, debugDescription];
+                    write!(f, "{}", crate::nsstring_as_str(&*string))
+                }
+            }
+        }
+
+        impl ::std::fmt::Debug for $owned_ident {
+            fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
+                ::std::ops::Deref::deref(self).fmt(f)
+            }
+        }
+    };
+}
+
+macro_rules! try_objc {
+    {
+        $err_name: ident => $body:expr
+    } => {
+        {
+            let mut $err_name: *mut ::objc::runtime::Object = ::std::ptr::null_mut();
+            let value = $body;
+            if !$err_name.is_null() {
+                let desc: *mut Object = msg_send![$err_name, localizedDescription];
+                let compile_error: *const std::os::raw::c_char = msg_send![desc, UTF8String];
+                let message = CStr::from_ptr(compile_error).to_string_lossy().into_owned();
+                let () = msg_send![$err_name, release];
+                return Err(message);
+            }
+            value
+        }
+    };
+}
+
+pub struct NSArray<T> {
+    _phantom: PhantomData<T>,
+}
+
+pub struct Array<T>(*mut NSArray<T>)
+where
+    T: ForeignType + 'static,
+    T::Ref: objc::Message + 'static;
+pub struct ArrayRef<T>(foreign_types::Opaque, PhantomData<T>)
+where
+    T: ForeignType + 'static,
+    T::Ref: objc::Message + 'static;
+
+impl<T> Drop for Array<T>
+where
+    T: ForeignType + 'static,
+    T::Ref: objc::Message + 'static,
+{
+    fn drop(&mut self) {
+        unsafe {
+            let () = msg_send![self.0, release];
+        }
+    }
+}
+
+impl<T> Clone for Array<T>
+where
+    T: ForeignType + 'static,
+    T::Ref: objc::Message + 'static,
+{
+    fn clone(&self) -> Self {
+        unsafe { Array(msg_send![self.0, retain]) }
+    }
+}
+
+unsafe impl<T> objc::Message for NSArray<T>
+where
+    T: ForeignType + 'static,
+    T::Ref: objc::Message + 'static,
+{
+}
+unsafe impl<T> objc::Message for ArrayRef<T>
+where
+    T: ForeignType + 'static,
+    T::Ref: objc::Message + 'static,
+{
+}
+
+impl<T> Array<T>
+where
+    T: ForeignType + 'static,
+    T::Ref: objc::Message + 'static,
+{
+    pub fn from_slice<'a>(s: &[&T::Ref]) -> &'a ArrayRef<T> {
+        unsafe {
+            let class = class!(NSArray);
+            msg_send![class, arrayWithObjects: s.as_ptr() count: s.len()]
+        }
+    }
+
+    pub fn from_owned_slice<'a>(s: &[T]) -> &'a ArrayRef<T> {
+        unsafe {
+            let class = class!(NSArray);
+            msg_send![class, arrayWithObjects: s.as_ptr() count: s.len()]
+        }
+    }
+}
+
+impl<T> foreign_types::ForeignType for Array<T>
+where
+    T: ForeignType + 'static,
+    T::Ref: objc::Message + 'static,
+{
+    type CType = NSArray<T>;
+    type Ref = ArrayRef<T>;
+
+    unsafe fn from_ptr(p: *mut NSArray<T>) -> Self {
+        Array(p)
+    }
+
+    fn as_ptr(&self) -> *mut NSArray<T> {
+        self.0
+    }
+}
+
+impl<T> foreign_types::ForeignTypeRef for ArrayRef<T>
+where
+    T: ForeignType + 'static,
+    T::Ref: objc::Message + 'static,
+{
+    type CType = NSArray<T>;
+}
+
+impl<T> Deref for Array<T>
+where
+    T: ForeignType + 'static,
+    T::Ref: objc::Message + 'static,
+{
+    type Target = ArrayRef<T>;
+
+    fn deref(&self) -> &ArrayRef<T> {
+        unsafe { mem::transmute(self.as_ptr()) }
+    }
+}
+
+impl<T> Borrow<ArrayRef<T>> for Array<T>
+where
+    T: ForeignType + 'static,
+    T::Ref: objc::Message + 'static,
+{
+    fn borrow(&self) -> &ArrayRef<T> {
+        unsafe { mem::transmute(self.as_ptr()) }
+    }
+}
+
+impl<T> ToOwned for ArrayRef<T>
+where
+    T: ForeignType + 'static,
+    T::Ref: objc::Message + 'static,
+{
+    type Owned = Array<T>;
+
+    fn to_owned(&self) -> Array<T> {
+        unsafe { Array::from_ptr(msg_send![self, retain]) }
+    }
+}
+
+pub enum CAMetalDrawable {}
+
+foreign_obj_type! {
+    type CType = CAMetalDrawable;
+    pub struct CoreAnimationDrawable;
+    pub struct CoreAnimationDrawableRef;
+    type ParentType = DrawableRef;
+}
+
+impl CoreAnimationDrawableRef {
+    pub fn texture(&self) -> &TextureRef {
+        unsafe { msg_send![self, texture] }
+    }
+}
+
+pub enum CAMetalLayer {}
+
+foreign_obj_type! {
+    type CType = CAMetalLayer;
+    pub struct CoreAnimationLayer;
+    pub struct CoreAnimationLayerRef;
+}
+
+impl CoreAnimationLayer {
+    pub fn new() -> Self {
+        unsafe {
+            let class = class!(CAMetalLayer);
+            msg_send![class, new]
+        }
+    }
+}
+
+impl CoreAnimationLayerRef {
+    pub fn device(&self) -> &DeviceRef {
+        unsafe { msg_send![self, device] }
+    }
+
+    pub fn set_device(&self, device: &DeviceRef) {
+        unsafe { msg_send![self, setDevice: device] }
+    }
+
+    pub fn pixel_format(&self) -> MTLPixelFormat {
+        unsafe { msg_send![self, pixelFormat] }
+    }
+
+    pub fn set_pixel_format(&self, pixel_format: MTLPixelFormat) {
+        unsafe { msg_send![self, setPixelFormat: pixel_format] }
+    }
+
+    pub fn drawable_size(&self) -> CGSize {
+        unsafe { msg_send![self, drawableSize] }
+    }
+
+    pub fn set_drawable_size(&self, size: CGSize) {
+        unsafe { msg_send![self, setDrawableSize: size] }
+    }
+
+    pub fn presents_with_transaction(&self) -> bool {
+        unsafe {
+            match msg_send![self, presentsWithTransaction] {
+                YES => true,
+                NO => false,
+                _ => unreachable!(),
+            }
+        }
+    }
+
+    pub fn set_presents_with_transaction(&self, transaction: bool) {
+        unsafe { msg_send![self, setPresentsWithTransaction: transaction] }
+    }
+
+    pub fn set_edge_antialiasing_mask(&self, mask: u64) {
+        unsafe { msg_send![self, setEdgeAntialiasingMask: mask] }
+    }
+
+    pub fn set_masks_to_bounds(&self, masks: bool) {
+        unsafe { msg_send![self, setMasksToBounds: masks] }
+    }
+
+    pub fn remove_all_animations(&self) {
+        unsafe { msg_send![self, removeAllAnimations] }
+    }
+
+    pub fn next_drawable(&self) -> Option<&CoreAnimationDrawableRef> {
+        unsafe { msg_send![self, nextDrawable] }
+    }
+
+    pub fn set_contents_scale(&self, scale: CGFloat) {
+        unsafe { msg_send![self, setContentsScale: scale] }
+    }
+
+    /// [framebufferOnly Apple Docs](https://developer.apple.com/documentation/metal/mtltexture/1515749-framebufferonly?language=objc)
+    pub fn set_framebuffer_only(&self, framebuffer_only: BOOL) {
+        unsafe { msg_send![self, setFramebufferOnly: framebuffer_only] }
+    }
+}
+
+mod argument;
+mod buffer;
+mod capturedescriptor;
+mod capturemanager;
+mod commandbuffer;
+mod commandqueue;
+mod constants;
+mod depthstencil;
+mod device;
+mod drawable;
+mod encoder;
+mod heap;
+mod indirect_encoder;
+mod library;
+mod pipeline;
+mod renderpass;
+mod resource;
+mod sampler;
+mod texture;
+mod types;
+mod vertexdescriptor;
+
+#[rustfmt::skip]
+pub use {
+    argument::*,
+    buffer::*,
+    capturedescriptor::*,
+    capturemanager::*,
+    commandbuffer::*,
+    commandqueue::*,
+    constants::*,
+    depthstencil::*,
+    device::*,
+    drawable::*,
+    encoder::*,
+    heap::*,
+    indirect_encoder::*,
+    library::*,
+    pipeline::*,
+    renderpass::*,
+    resource::*,
+    sampler::*,
+    texture::*,
+    types::*,
+    vertexdescriptor::*,
+};
+
+#[inline]
+unsafe fn obj_drop<T>(p: *mut T) {
+    msg_send![(p as *mut Object), release]
+}
+
+#[inline]
+unsafe fn obj_clone<T: 'static>(p: *mut T) -> *mut T {
+    msg_send![(p as *mut Object), retain]
+}
+
+#[allow(non_camel_case_types)]
+type c_size_t = usize;
diff --git a/third_party/rust/metal/src/library.rs b/third_party/rust/metal/src/library.rs
new file mode 100644
index 0000000000..6a8df76bb0
--- /dev/null
+++ b/third_party/rust/metal/src/library.rs
@@ -0,0 +1,259 @@
+// Copyright 2017 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+use super::*;
+
+use cocoa_foundation::foundation::NSUInteger;
+use foreign_types::ForeignType;
+use objc::runtime::{Object, NO, YES};
+use std::ffi::CStr;
+
+pub enum MTLVertexAttribute {}
+
+foreign_obj_type! {
+    type CType = MTLVertexAttribute;
+    pub struct VertexAttribute;
+    pub struct VertexAttributeRef;
+}
+
+impl VertexAttributeRef {
+    pub fn name(&self) -> &str {
+        unsafe {
+            let name = msg_send![self, name];
+            crate::nsstring_as_str(name)
+        }
+    }
+
+    pub fn attribute_index(&self) -> u64 {
+        unsafe { msg_send![self, attributeIndex] }
+    }
+
+    pub fn attribute_type(&self) -> MTLDataType {
+        unsafe { msg_send![self, attributeType] }
+    }
+
+    pub fn is_active(&self) -> bool {
+        unsafe {
+            match msg_send![self, isActive] {
+                YES => true,
+                NO => false,
+                _ => unreachable!(),
+            }
+        }
+    }
+}
+
+#[repr(u64)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+pub enum MTLFunctionType {
+    Vertex = 1,
+    Fragment = 2,
+    Kernel = 3,
+}
+
+pub enum MTLFunction {}
+
+foreign_obj_type! {
+    type CType = MTLFunction;
+    pub struct Function;
+    pub struct FunctionRef;
+}
+
+impl FunctionRef {
+    pub fn name(&self) -> &str {
+        unsafe {
+            let name = msg_send![self, name];
+            crate::nsstring_as_str(name)
+        }
+    }
+
+    pub fn function_type(&self) -> MTLFunctionType {
+        unsafe { msg_send![self, functionType] }
+    }
+
+    pub fn vertex_attributes(&self) -> &Array<VertexAttribute> {
+        unsafe { msg_send![self, vertexAttributes] }
+    }
+
+    pub fn new_argument_encoder(&self, buffer_index: NSUInteger) -> ArgumentEncoder {
+        unsafe {
+            let ptr = msg_send![self, newArgumentEncoderWithBufferIndex: buffer_index];
+            ArgumentEncoder::from_ptr(ptr)
+        }
+    }
+
+    pub fn function_constants_dictionary(&self) -> *mut Object {
+        unsafe { msg_send![self, functionConstantsDictionary] }
+    }
+}
+
+#[repr(u64)]
+#[allow(non_camel_case_types)]
+#[derive(Clone, Copy, Debug, Hash, Eq, PartialEq, Ord, PartialOrd)]
+pub enum MTLLanguageVersion {
+    V1_0 = 0x10000,
+    V1_1 = 0x10001,
+    V1_2 = 0x10002,
+    V2_0 = 0x20000,
+    V2_1 = 0x20001,
+    V2_2 = 0x20002,
+}
+
+pub enum MTLFunctionConstantValues {}
+
+foreign_obj_type! {
+    type CType = MTLFunctionConstantValues;
+    pub struct FunctionConstantValues;
+    pub struct FunctionConstantValuesRef;
+}
+
+impl FunctionConstantValues {
+    pub fn new() -> Self {
+        unsafe {
+            let class = class!(MTLFunctionConstantValues);
+            msg_send![class, new]
+        }
+    }
+}
+
+impl FunctionConstantValuesRef {
+    pub unsafe fn set_constant_value_at_index(
+        &self,
+        index: NSUInteger,
+        ty: MTLDataType,
+        value: *const std::os::raw::c_void,
+    ) {
+        msg_send![self, setConstantValue:value type:ty atIndex:index]
+    }
+}
+
+pub enum MTLCompileOptions {}
+
+foreign_obj_type! {
+    type CType = MTLCompileOptions;
+    pub struct CompileOptions;
+    pub struct CompileOptionsRef;
+}
+
+impl CompileOptions {
+    pub fn new() -> Self {
+        unsafe {
+            let class = class!(MTLCompileOptions);
+            msg_send![class, new]
+        }
+    }
+}
+
+impl CompileOptionsRef {
+    pub unsafe fn preprocessor_defines(&self) -> *mut Object {
+        msg_send![self, preprocessorMacros]
+    }
+
+    pub unsafe fn set_preprocessor_defines(&self, defines: *mut Object) {
+        msg_send![self, setPreprocessorMacros: defines]
+    }
+
+    pub fn is_fast_math_enabled(&self) -> bool {
+        unsafe {
+            match msg_send![self, fastMathEnabled] {
+                YES => true,
+                NO => false,
+                _ => unreachable!(),
+            }
+        }
+    }
+
+    pub fn set_fast_math_enabled(&self, enabled: bool) {
+        unsafe { msg_send![self, setFastMathEnabled: enabled] }
+    }
+
+    pub fn language_version(&self) -> MTLLanguageVersion {
+        unsafe { msg_send![self, languageVersion] }
+    }
+
+    pub fn set_language_version(&self, version: MTLLanguageVersion) {
+        unsafe { msg_send![self, setLanguageVersion: version] }
+    }
+}
+
+#[repr(u64)]
+#[allow(non_camel_case_types)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+pub enum MTLLibraryError {
+    Unsupported = 1,
+    Internal = 2,
+    CompileFailure = 3,
+    CompileWarning = 4,
+}
+
+pub enum MTLLibrary {}
+
+foreign_obj_type! {
+    type CType = MTLLibrary;
+    pub struct Library;
+    pub struct LibraryRef;
+}
+
+impl LibraryRef {
+    pub fn device(&self) -> &DeviceRef {
+        unsafe { msg_send![self, device] }
+    }
+
+    pub fn label(&self) -> &str {
+        unsafe {
+            let label = msg_send![self, label];
+            crate::nsstring_as_str(label)
+        }
+    }
+
+    pub fn set_label(&self, label: &str) {
+        unsafe {
+            let nslabel = crate::nsstring_from_str(label);
+            let () = msg_send![self, setLabel: nslabel];
+        }
+    }
+
+    pub fn get_function(
+        &self,
+        name: &str,
+        constants: Option<FunctionConstantValues>,
+    ) -> Result<Function, String> {
+        unsafe {
+            let nsname = crate::nsstring_from_str(name);
+
+            let function: *mut MTLFunction = match constants {
+                Some(c) => try_objc! { err => msg_send![self,
+                    newFunctionWithName: nsname.as_ref()
+                    constantValues: c.as_ref()
+                    error: &mut err
+                ]},
+                None => msg_send![self, newFunctionWithName: nsname.as_ref()],
+            };
+
+            if !function.is_null() {
+                Ok(Function::from_ptr(function))
+            } else {
+                Err(format!("Function '{}' does not exist", name))
+            }
+        }
+    }
+
+    pub fn function_names(&self) -> Vec<String> {
+        unsafe {
+            let names: *mut Object = msg_send![self, functionNames];
+            let count: NSUInteger = msg_send![names, count];
+            let ret = (0..count)
+                .map(|i| {
+                    let name = msg_send![names, objectAtIndex: i];
+                    nsstring_as_str(name).to_string()
+                })
+                .collect();
+            let () = msg_send![names, release];
+            ret
+        }
+    }
+}
diff --git a/third_party/rust/metal/src/pipeline/compute.rs b/third_party/rust/metal/src/pipeline/compute.rs
new file mode 100644
index 0000000000..67724b1c9c
--- /dev/null
+++ b/third_party/rust/metal/src/pipeline/compute.rs
@@ -0,0 +1,354 @@
+// Copyright 2017 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+use super::*;
+
+use cocoa_foundation::foundation::NSUInteger;
+use objc::runtime::{NO, YES};
+
+#[repr(u64)]
+#[allow(non_camel_case_types)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
+pub enum MTLAttributeFormat {
+    Invalid = 0,
+    UChar2 = 1,
+    UChar3 = 2,
+    UChar4 = 3,
+    Char2 = 4,
+    Char3 = 5,
+    Char4 = 6,
+    UChar2Normalized = 7,
+    UChar3Normalized = 8,
+    UChar4Normalized = 9,
+    Char2Normalized = 10,
+    Char3Normalized = 11,
+    Char4Normalized = 12,
+    UShort2 = 13,
+    UShort3 = 14,
+    UShort4 = 15,
+    Short2 = 16,
+    Short3 = 17,
+    Short4 = 18,
+    UShort2Normalized = 19,
+    UShort3Normalized = 20,
+    UShort4Normalized = 21,
+    Short2Normalized = 22,
+    Short3Normalized = 23,
+    Short4Normalized = 24,
+    Half2 = 25,
+    Half3 = 26,
+    Half4 = 27,
+    Float = 28,
+    Float2 = 29,
+    Float3 = 30,
+    Float4 = 31,
+    Int = 32,
+    Int2 = 33,
+    Int3 = 34,
+    Int4 = 35,
+    UInt = 36,
+    UInt2 = 37,
+    UInt3 = 38,
+    UInt4 = 39,
+    Int1010102Normalized = 40,
+    UInt1010102Normalized = 41,
+    UChar4Normalized_BGRA = 42,
+    UChar = 45,
+    Char = 46,
+    UCharNormalized = 47,
+    CharNormalized = 48,
+    UShort = 49,
+    Short = 50,
+    UShortNormalized = 51,
+    ShortNormalized = 52,
+    Half = 53,
+}
+
+#[repr(u64)]
+#[allow(non_camel_case_types)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
+pub enum MTLStepFunction {
+    Constant = 0,
+    PerInstance = 1,
+    PerPatch = 2,
+    PerPatchControlPoint = 3,
+    PerVertex = 4,
+    ThreadPositionInGridX = 5,
+    ThreadPositionInGridXIndexed = 6,
+    ThreadPositionInGridY = 7,
+    ThreadPositionInGridYIndexed = 8,
+}
+
+pub enum MTLComputePipelineDescriptor {}
+
+foreign_obj_type! {
+    type CType = MTLComputePipelineDescriptor;
+    pub struct ComputePipelineDescriptor;
+    pub struct ComputePipelineDescriptorRef;
+}
+
+impl ComputePipelineDescriptor {
+    pub fn new() -> Self {
+        unsafe {
+            let class = class!(MTLComputePipelineDescriptor);
+            msg_send![class, new]
+        }
+    }
+}
+
+impl ComputePipelineDescriptorRef {
+    pub fn label(&self) -> &str {
+        unsafe {
+            let label = msg_send![self, label];
+            crate::nsstring_as_str(label)
+        }
+    }
+
+    pub fn set_label(&self, label: &str) {
+        unsafe {
+            let nslabel = crate::nsstring_from_str(label);
+            let () = msg_send![self, setLabel: nslabel];
+        }
+    }
+
+    pub fn compute_function(&self) -> Option<&FunctionRef> {
+        unsafe { msg_send![self, computeFunction] }
+    }
+
+    pub fn set_compute_function(&self, function: Option<&FunctionRef>) {
+        unsafe { msg_send![self, setComputeFunction: function] }
+    }
+
+    pub fn thread_group_size_is_multiple_of_thread_execution_width(&self) -> bool {
+        unsafe {
+            match msg_send![self, threadGroupSizeIsMultipleOfThreadExecutionWidth] {
+                YES => true,
+                NO => false,
+                _ => unreachable!(),
+            }
+        }
+    }
+
+    pub fn set_thread_group_size_is_multiple_of_thread_execution_width(
+        &self,
+        size_is_multiple_of_width: bool,
+    ) {
+        unsafe {
+            msg_send![
+                self,
+                setThreadGroupSizeIsMultipleOfThreadExecutionWidth: size_is_multiple_of_width
+            ]
+        }
+    }
+
+    pub fn stage_input_descriptor(&self) -> Option<&StageInputOutputDescriptorRef> {
+        unsafe { msg_send![self, stageInputDescriptor] }
+    }
+
+    pub fn set_stage_input_descriptor(&self, descriptor: Option<&StageInputOutputDescriptorRef>) {
+        unsafe { msg_send![self, setStageInputDescriptor: descriptor] }
+    }
+
+    pub fn buffers(&self) -> Option<&PipelineBufferDescriptorArrayRef> {
+        unsafe { msg_send![self, buffers] }
+    }
+
+    pub fn reset(&self) {
+        unsafe { msg_send![self, reset] }
+    }
+}
+
+pub enum MTLComputePipelineState {}
+
+foreign_obj_type! {
+    type CType = MTLComputePipelineState;
+    pub struct ComputePipelineState;
+    pub struct ComputePipelineStateRef;
+}
+
+impl ComputePipelineStateRef {
+    pub fn label(&self) -> &str {
+        unsafe {
+            let label = msg_send![self, label];
+            crate::nsstring_as_str(label)
+        }
+    }
+
+    pub fn set_label(&self, label: &str) {
+        unsafe {
+            let nslabel = crate::nsstring_from_str(label);
+            let () = msg_send![self, setLabel: nslabel];
+        }
+    }
+
+    pub fn max_total_threads_per_group(&self) -> NSUInteger {
+        unsafe { msg_send![self, maxTotalThreadsPerThreadgroup] }
+    }
+
+    pub fn thread_execution_width(&self) -> NSUInteger {
+        unsafe { msg_send![self, threadExecutionWidth] }
+    }
+
+    pub fn static_threadgroup_memory_length(&self) -> NSUInteger {
+        unsafe { msg_send![self, staticThreadgroupMemoryLength] }
+    }
+}
+
+pub enum MTLStageInputOutputDescriptor {}
+
+foreign_obj_type! {
+    type CType = MTLStageInputOutputDescriptor;
+    pub struct StageInputOutputDescriptor;
+    pub struct StageInputOutputDescriptorRef;
+}
+
+impl StageInputOutputDescriptor {
+    pub fn new<'a>() -> &'a StageInputOutputDescriptorRef {
+        unsafe {
+            let class = class!(MTLStageInputOutputDescriptor);
+            msg_send![class, stageInputOutputDescriptor]
+        }
+    }
+}
+
+impl StageInputOutputDescriptorRef {
+    pub fn attributes(&self) -> Option<&AttributeDescriptorArrayRef> {
+        unsafe { msg_send![self, attributes] }
+    }
+
+    pub fn index_buffer_index(&self) -> NSUInteger {
+        unsafe { msg_send![self, indexBufferIndex] }
+    }
+
+    pub fn set_index_buffer_index(&self, idx_buffer_idx: NSUInteger) {
+        unsafe { msg_send![self, setIndexBufferIndex: idx_buffer_idx] }
+    }
+
+    pub fn index_type(&self) -> MTLIndexType {
+        unsafe { msg_send![self, indexType] }
+    }
+
+    pub fn set_index_type(&self, index_ty: MTLIndexType) {
+        unsafe { msg_send![self, setIndexType: index_ty] }
+    }
+
+    pub fn layouts(&self) -> Option<&BufferLayoutDescriptorArrayRef> {
+        unsafe { msg_send![self, layouts] }
+    }
+
+    pub fn reset(&self) {
+        unsafe { msg_send![self, reset] }
+    }
+}
+
+pub enum MTLAttributeDescriptorArray {}
+
+foreign_obj_type! {
+    type CType = MTLAttributeDescriptorArray;
+    pub struct AttributeDescriptorArray;
+    pub struct AttributeDescriptorArrayRef;
+}
+
+impl AttributeDescriptorArrayRef {
+    pub fn object_at(&self, index: NSUInteger) -> Option<&AttributeDescriptorRef> {
+        unsafe { msg_send![self, objectAtIndexedSubscript: index] }
+    }
+
+    pub fn set_object_at(&self, index: NSUInteger, buffer_desc: Option<&AttributeDescriptorRef>) {
+        unsafe { msg_send![self, setObject:buffer_desc atIndexedSubscript:index] }
+    }
+}
+
+pub enum MTLAttributeDescriptor {}
+
+foreign_obj_type! {
+    type CType = MTLAttributeDescriptor;
+    pub struct AttributeDescriptor;
+    pub struct AttributeDescriptorRef;
+}
+
+impl AttributeDescriptorRef {
+    pub fn buffer_index(&self) -> NSUInteger {
+        unsafe { msg_send![self, bufferIndex] }
+    }
+
+    pub fn set_buffer_index(&self, buffer_index: NSUInteger) {
+        unsafe { msg_send![self, setBufferIndex: buffer_index] }
+    }
+
+    pub fn format(&self) -> MTLAttributeFormat {
+        unsafe { msg_send![self, format] }
+    }
+
+    pub fn set_format(&self, format: MTLAttributeFormat) {
+        unsafe { msg_send![self, setFormat: format] }
+    }
+
+    pub fn offset(&self) -> NSUInteger {
+        unsafe { msg_send![self, offset] }
+    }
+
+    pub fn set_offset(&self, offset: NSUInteger) {
+        unsafe { msg_send![self, setOffset: offset] }
+    }
+}
+
+pub enum MTLBufferLayoutDescriptorArray {}
+
+foreign_obj_type! {
+    type CType = MTLBufferLayoutDescriptorArray;
+    pub struct BufferLayoutDescriptorArray;
+    pub struct BufferLayoutDescriptorArrayRef;
+}
+
+impl BufferLayoutDescriptorArrayRef {
+    pub fn object_at(&self, index: NSUInteger) -> Option<&BufferLayoutDescriptorRef> {
+        unsafe { msg_send![self, objectAtIndexedSubscript: index] }
+    }
+
+    pub fn set_object_at(
+        &self,
+        index: NSUInteger,
+        buffer_desc: Option<&BufferLayoutDescriptorRef>,
+    ) {
+        unsafe { msg_send![self, setObject:buffer_desc atIndexedSubscript:index] }
+    }
+}
+
+pub enum MTLBufferLayoutDescriptor {}
+
+foreign_obj_type! {
+    type CType = MTLBufferLayoutDescriptor;
+    pub struct BufferLayoutDescriptor;
+    pub struct BufferLayoutDescriptorRef;
+}
+
+impl BufferLayoutDescriptorRef {
+    pub fn step_function(&self) -> MTLStepFunction {
+        unsafe { msg_send![self, stepFunction] }
+    }
+
+    pub fn set_step_function(&self, step_function: MTLStepFunction) {
+        unsafe { msg_send![self, setStepFunction: step_function] }
+    }
+
+    pub fn step_rate(&self) -> NSUInteger {
+        unsafe { msg_send![self, stepRate] }
+    }
+
+    pub fn set_step_rate(&self, step_rate: NSUInteger) {
+        unsafe { msg_send![self, setStepRate: step_rate] }
+    }
+
+    pub fn stride(&self) -> NSUInteger {
+        unsafe { msg_send![self, stride] }
+    }
+
+    pub fn set_stride(&self, stride: NSUInteger) {
+        unsafe { msg_send![self, setStride: stride] }
+    }
+}
diff --git a/third_party/rust/metal/src/pipeline/mod.rs b/third_party/rust/metal/src/pipeline/mod.rs
new file mode 100644
index 0000000000..e65d28d6ca
--- /dev/null
+++ b/third_party/rust/metal/src/pipeline/mod.rs
@@ -0,0 +1,70 @@
+// Copyright 2017 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+use super::*;
+
+mod compute;
+mod render;
+
+pub use self::compute::*;
+pub use self::render::*;
+
+#[repr(u64)]
+#[allow(non_camel_case_types)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
+pub enum MTLMutability {
+    Default = 0,
+    Mutable = 1,
+    Immutable = 2,
+}
+
+impl Default for MTLMutability {
+    #[inline]
+    fn default() -> Self {
+        MTLMutability::Default
+    }
+}
+
+pub enum MTLPipelineBufferDescriptorArray {}
+
+foreign_obj_type! {
+    type CType = MTLPipelineBufferDescriptorArray;
+    pub struct PipelineBufferDescriptorArray;
+    pub struct PipelineBufferDescriptorArrayRef;
+}
+
+impl PipelineBufferDescriptorArrayRef {
+    pub fn object_at(&self, index: NSUInteger) -> Option<&PipelineBufferDescriptorRef> {
+        unsafe { msg_send![self, objectAtIndexedSubscript: index] }
+    }
+
+    pub fn set_object_at(
+        &self,
+        index: NSUInteger,
+        buffer_desc: Option<&PipelineBufferDescriptorRef>,
+    ) {
+        unsafe { msg_send![self, setObject:buffer_desc atIndexedSubscript:index] }
+    }
+}
+
+pub enum MTLPipelineBufferDescriptor {}
+
+foreign_obj_type! {
+    type CType = MTLPipelineBufferDescriptor;
+    pub struct PipelineBufferDescriptor;
+    pub struct PipelineBufferDescriptorRef;
+}
+
+impl PipelineBufferDescriptorRef {
+    pub fn mutability(&self) -> MTLMutability {
+        unsafe { msg_send![self, mutability] }
+    }
+
+    pub fn set_mutability(&self, new_mutability: MTLMutability) {
+        unsafe { msg_send![self, setMutability: new_mutability] }
+    }
+}
diff --git a/third_party/rust/metal/src/pipeline/render.rs b/third_party/rust/metal/src/pipeline/render.rs
new file mode 100644
index 0000000000..6a4f91b2a4
--- /dev/null
+++ b/third_party/rust/metal/src/pipeline/render.rs
@@ -0,0 +1,432 @@
+// Copyright 2017 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+use super::*;
+
+use cocoa_foundation::foundation::NSUInteger;
+use objc::runtime::{NO, YES};
+
+#[repr(u64)]
+#[allow(non_camel_case_types)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
+pub enum MTLBlendFactor {
+    Zero = 0,
+    One = 1,
+    SourceColor = 2,
+    OneMinusSourceColor = 3,
+    SourceAlpha = 4,
+    OneMinusSourceAlpha = 5,
+    DestinationColor = 6,
+    OneMinusDestinationColor = 7,
+    DestinationAlpha = 8,
+    OneMinusDestinationAlpha = 9,
+    SourceAlphaSaturated = 10,
+    BlendColor = 11,
+    OneMinusBlendColor = 12,
+    BlendAlpha = 13,
+    OneMinusBlendAlpha = 14,
+    Source1Color = 15,
+    OneMinusSource1Color = 16,
+    Source1Alpha = 17,
+    OneMinusSource1Alpha = 18,
+}
+
+#[repr(u64)]
+#[allow(non_camel_case_types)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
+pub enum MTLBlendOperation {
+    Add = 0,
+    Subtract = 1,
+    ReverseSubtract = 2,
+    Min = 3,
+    Max = 4,
+}
+
+bitflags! {
+    pub struct MTLColorWriteMask: NSUInteger {
+        const Red   = 0x1 << 3;
+        const Green = 0x1 << 2;
+        const Blue  = 0x1 << 1;
+        const Alpha = 0x1 << 0;
+    }
+}
+
+#[repr(u64)]
+#[allow(non_camel_case_types)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
+pub enum MTLPrimitiveTopologyClass {
+    Unspecified = 0,
+    Point = 1,
+    Line = 2,
+    Triangle = 3,
+}
+
+pub enum MTLRenderPipelineColorAttachmentDescriptor {}
+
+foreign_obj_type! {
+    type CType = MTLRenderPipelineColorAttachmentDescriptor;
+    pub struct RenderPipelineColorAttachmentDescriptor;
+    pub struct RenderPipelineColorAttachmentDescriptorRef;
+}
+
+impl RenderPipelineColorAttachmentDescriptorRef {
+    pub fn pixel_format(&self) -> MTLPixelFormat {
+        unsafe { msg_send![self, pixelFormat] }
+    }
+
+    pub fn set_pixel_format(&self, pixel_format: MTLPixelFormat) {
+        unsafe { msg_send![self, setPixelFormat: pixel_format] }
+    }
+
+    pub fn is_blending_enabled(&self) -> bool {
+        unsafe {
+            match msg_send![self, isBlendingEnabled] {
+                YES => true,
+                NO => false,
+                _ => unreachable!(),
+            }
+        }
+    }
+
+    pub fn set_blending_enabled(&self, enabled: bool) {
+        unsafe { msg_send![self, setBlendingEnabled: enabled] }
+    }
+
+    pub fn source_rgb_blend_factor(&self) -> MTLBlendFactor {
+        unsafe { msg_send![self, sourceRGBBlendFactor] }
+    }
+
+    pub fn set_source_rgb_blend_factor(&self, blend_factor: MTLBlendFactor) {
+        unsafe { msg_send![self, setSourceRGBBlendFactor: blend_factor] }
+    }
+
+    pub fn destination_rgb_blend_factor(&self) -> MTLBlendFactor {
+        unsafe { msg_send![self, destinationRGBBlendFactor] }
+    }
+
+    pub fn set_destination_rgb_blend_factor(&self, blend_factor: MTLBlendFactor) {
+        unsafe { msg_send![self, setDestinationRGBBlendFactor: blend_factor] }
+    }
+
+    pub fn rgb_blend_operation(&self) -> MTLBlendOperation {
+        unsafe { msg_send![self, rgbBlendOperation] }
+    }
+
+    pub fn set_rgb_blend_operation(&self, blend_operation: MTLBlendOperation) {
+        unsafe { msg_send![self, setRgbBlendOperation: blend_operation] }
+    }
+
+    pub fn source_alpha_blend_factor(&self) -> MTLBlendFactor {
+        unsafe { msg_send![self, sourceAlphaBlendFactor] }
+    }
+
+    pub fn set_source_alpha_blend_factor(&self, blend_factor: MTLBlendFactor) {
+        unsafe { msg_send![self, setSourceAlphaBlendFactor: blend_factor] }
+    }
+
+    pub fn destination_alpha_blend_factor(&self) -> MTLBlendFactor {
+        unsafe { msg_send![self, destinationAlphaBlendFactor] }
+    }
+
+    pub fn set_destination_alpha_blend_factor(&self, blend_factor: MTLBlendFactor) {
+        unsafe { msg_send![self, setDestinationAlphaBlendFactor: blend_factor] }
+    }
+
+    pub fn alpha_blend_operation(&self) -> MTLBlendOperation {
+        unsafe { msg_send![self, alphaBlendOperation] }
+    }
+
+    pub fn set_alpha_blend_operation(&self, blend_operation: MTLBlendOperation) {
+        unsafe { msg_send![self, setAlphaBlendOperation: blend_operation] }
+    }
+
+    pub fn write_mask(&self) -> MTLColorWriteMask {
+        unsafe { msg_send![self, writeMask] }
+    }
+
+    pub fn set_write_mask(&self, mask: MTLColorWriteMask) {
+        unsafe { msg_send![self, setWriteMask: mask] }
+    }
+}
+
+pub enum MTLRenderPipelineReflection {}
+
+foreign_obj_type! {
+    type CType = MTLRenderPipelineReflection;
+    pub struct RenderPipelineReflection;
+    pub struct RenderPipelineReflectionRef;
+}
+
+impl RenderPipelineReflection {
+    #[cfg(feature = "private")]
+    pub unsafe fn new(
+        vertex_data: *mut std::ffi::c_void,
+        fragment_data: *mut std::ffi::c_void,
+        vertex_desc: *mut std::ffi::c_void,
+        device: &DeviceRef,
+        options: u64,
+        flags: u64,
+    ) -> Self {
+        let class = class!(MTLRenderPipelineReflection);
+        let this: RenderPipelineReflection = msg_send![class, alloc];
+        let this_alias: *mut Object = msg_send![this.as_ref(), initWithVertexData:vertex_data
+                                                                fragmentData:fragment_data
+                                                serializedVertexDescriptor:vertex_desc
+                                                                    device:device
+                                                                    options:options
+                                                                        flags:flags];
+        if this_alias.is_null() {
+            panic!("[MTLRenderPipelineReflection init] failed");
+        }
+        this
+    }
+}
+
+impl RenderPipelineReflectionRef {
+    pub fn fragment_arguments(&self) -> &Array<Argument> {
+        unsafe { msg_send![self, fragmentArguments] }
+    }
+
+    pub fn vertex_arguments(&self) -> &Array<Argument> {
+        unsafe { msg_send![self, vertexArguments] }
+    }
+}
+
+pub enum MTLRenderPipelineDescriptor {}
+
+foreign_obj_type! {
+    type CType = MTLRenderPipelineDescriptor;
+    pub struct RenderPipelineDescriptor;
+    pub struct RenderPipelineDescriptorRef;
+}
+
+impl RenderPipelineDescriptor {
+    pub fn new() -> Self {
+        unsafe {
+            let class = class!(MTLRenderPipelineDescriptor);
+            msg_send![class, new]
+        }
+    }
+}
+
+impl RenderPipelineDescriptorRef {
+    pub fn label(&self) -> &str {
+        unsafe {
+            let label = msg_send![self, label];
+            crate::nsstring_as_str(label)
+        }
+    }
+
+    pub fn set_label(&self, label: &str) {
+        unsafe {
+            let nslabel = crate::nsstring_from_str(label);
+            let () = msg_send![self, setLabel: nslabel];
+        }
+    }
+
+    pub fn vertex_function(&self) -> Option<&FunctionRef> {
+        unsafe { msg_send![self, vertexFunction] }
+    }
+
+    pub fn set_vertex_function(&self, function: Option<&FunctionRef>) {
+        unsafe { msg_send![self, setVertexFunction: function] }
+    }
+
+    pub fn fragment_function(&self) -> Option<&FunctionRef> {
+        unsafe { msg_send![self, fragmentFunction] }
+    }
+
+    pub fn set_fragment_function(&self, function: Option<&FunctionRef>) {
+        unsafe { msg_send![self, setFragmentFunction: function] }
+    }
+
+    pub fn vertex_descriptor(&self) -> Option<&VertexDescriptorRef> {
+        unsafe { msg_send![self, vertexDescriptor] }
+    }
+
+    pub fn set_vertex_descriptor(&self, descriptor: Option<&VertexDescriptorRef>) {
+        unsafe { msg_send![self, setVertexDescriptor: descriptor] }
+    }
+
+    pub fn sample_count(&self) -> NSUInteger {
+        unsafe { msg_send![self, sampleCount] }
+    }
+
+    pub fn set_sample_count(&self, count: NSUInteger) {
+        unsafe { msg_send![self, setSampleCount: count] }
+    }
+
+    pub fn max_vertex_amplification_count(&self) -> NSUInteger {
+        unsafe { msg_send![self, maxVertexAmplificationCount] }
+    }
+
+    pub fn set_max_vertex_amplification_count(&self, count: NSUInteger) {
+        unsafe { msg_send![self, setMaxVertexAmplificationCount: count] }
+    }
+
+    pub fn is_alpha_to_coverage_enabled(&self) -> bool {
+        unsafe {
+            match msg_send![self, isAlphaToCoverageEnabled] {
+                YES => true,
+                NO => false,
+                _ => unreachable!(),
+            }
+        }
+    }
+
+    pub fn set_alpha_to_coverage_enabled(&self, enabled: bool) {
+        unsafe { msg_send![self, setAlphaToCoverageEnabled: enabled] }
+    }
+
+    pub fn is_alpha_to_one_enabled(&self) -> bool {
+        unsafe {
+            match msg_send![self, isAlphaToOneEnabled] {
+                YES => true,
+                NO => false,
+                _ => unreachable!(),
+            }
+        }
+    }
+
+    pub fn set_alpha_to_one_enabled(&self, enabled: bool) {
+        unsafe { msg_send![self, setAlphaToOneEnabled: enabled] }
+    }
+
+    pub fn is_rasterization_enabled(&self) -> bool {
+        unsafe {
+            match msg_send![self, isRasterizationEnabled] {
+                YES => true,
+                NO => false,
+                _ => unreachable!(),
+            }
+        }
+    }
+
+    pub fn set_rasterization_enabled(&self, enabled: bool) {
+        unsafe { msg_send![self, setRasterizationEnabled: enabled] }
+    }
+
+    pub fn color_attachments(&self) -> &RenderPipelineColorAttachmentDescriptorArrayRef {
+        unsafe { msg_send![self, colorAttachments] }
+    }
+
+    pub fn depth_attachment_pixel_format(&self) -> MTLPixelFormat {
+        unsafe { msg_send![self, depthAttachmentPixelFormat] }
+    }
+
+    pub fn set_depth_attachment_pixel_format(&self, pixel_format: MTLPixelFormat) {
+        unsafe { msg_send![self, setDepthAttachmentPixelFormat: pixel_format] }
+    }
+
+    pub fn stencil_attachment_pixel_format(&self) -> MTLPixelFormat {
+        unsafe { msg_send![self, stencilAttachmentPixelFormat] }
+    }
+
+    pub fn set_stencil_attachment_pixel_format(&self, pixel_format: MTLPixelFormat) {
+        unsafe { msg_send![self, setStencilAttachmentPixelFormat: pixel_format] }
+    }
+
+    pub fn input_primitive_topology(&self) -> MTLPrimitiveTopologyClass {
+        unsafe { msg_send![self, inputPrimitiveTopology] }
+    }
+
+    pub fn set_input_primitive_topology(&self, topology: MTLPrimitiveTopologyClass) {
+        unsafe { msg_send![self, setInputPrimitiveTopology: topology] }
+    }
+
+    #[cfg(feature = "private")]
+    pub unsafe fn serialize_vertex_data(&self) -> *mut std::ffi::c_void {
+        use std::ptr;
+        let flags = 0;
+        let err: *mut Object = ptr::null_mut();
+        msg_send![self, newSerializedVertexDataWithFlags:flags
+                                                    error:err]
+    }
+
+    #[cfg(feature = "private")]
+    pub unsafe fn serialize_fragment_data(&self) -> *mut std::ffi::c_void {
+        msg_send![self, serializeFragmentData]
+    }
+
+    pub fn support_indirect_command_buffers(&self) -> bool {
+        unsafe {
+            match msg_send![self, supportIndirectCommandBuffers] {
+                YES => true,
+                NO => false,
+                _ => unreachable!(),
+            }
+        }
+    }
+
+    pub fn set_support_indirect_command_buffers(&self, support: bool) {
+        unsafe { msg_send![self, setSupportIndirectCommandBuffers: support] }
+    }
+
+    pub fn vertex_buffers(&self) -> Option<&PipelineBufferDescriptorArrayRef> {
+        unsafe { msg_send![self, vertexBuffers] }
+    }
+
+    pub fn fragment_buffers(&self) -> Option<&PipelineBufferDescriptorArrayRef> {
+        unsafe { msg_send![self, fragmentBuffers] }
+    }
+
+    pub fn reset(&self) {
+        unsafe { msg_send![self, reset] }
+    }
+}
+
+pub enum MTLRenderPipelineState {}
+
+foreign_obj_type! {
+    type CType = MTLRenderPipelineState;
+    pub struct RenderPipelineState;
+    pub struct RenderPipelineStateRef;
+}
+
+impl RenderPipelineStateRef {
+    pub fn label(&self) -> &str {
+        unsafe {
+            let label = msg_send![self, label];
+            crate::nsstring_as_str(label)
+        }
+    }
+
+    pub fn set_label(&self, label: &str) {
+        unsafe {
+            let nslabel = crate::nsstring_from_str(label);
+            let () = msg_send![self, setLabel: nslabel];
+        }
+    }
+}
+
+pub enum MTLRenderPipelineColorAttachmentDescriptorArray {}
+
+foreign_obj_type! {
+    type CType = MTLRenderPipelineColorAttachmentDescriptorArray;
+    pub struct RenderPipelineColorAttachmentDescriptorArray;
+    pub struct RenderPipelineColorAttachmentDescriptorArrayRef;
+}
+
+impl RenderPipelineColorAttachmentDescriptorArrayRef {
+    pub fn object_at(
+        &self,
+        index: NSUInteger,
+    ) -> Option<&RenderPipelineColorAttachmentDescriptorRef> {
+        unsafe { msg_send![self, objectAtIndexedSubscript: index] }
+    }
+
+    pub fn set_object_at(
+        &self,
+        index: NSUInteger,
+        attachment: Option<&RenderPipelineColorAttachmentDescriptorRef>,
+    ) {
+        unsafe {
+            msg_send![self, setObject:attachment
+                   atIndexedSubscript:index]
+        }
+    }
+}
diff --git a/third_party/rust/metal/src/renderpass.rs b/third_party/rust/metal/src/renderpass.rs
new file mode 100644
index 0000000000..4d1e867eb7
--- /dev/null
+++ b/third_party/rust/metal/src/renderpass.rs
@@ -0,0 +1,334 @@
+// Copyright 2016 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+use super::*;
+
+use cocoa_foundation::foundation::NSUInteger;
+
+#[repr(u64)]
+#[derive(Copy, Clone, Debug)]
+pub enum MTLLoadAction {
+    DontCare = 0,
+    Load = 1,
+    Clear = 2,
+}
+
+#[repr(u64)]
+#[derive(Copy, Clone, Debug)]
+pub enum MTLStoreAction {
+    DontCare = 0,
+    Store = 1,
+    MultisampleResolve = 2,
+    StoreAndMultisampleResolve = 3,
+    Unknown = 4,
+    CustomSampleDepthStore = 5,
+}
+
+#[repr(C)]
+#[derive(Copy, Clone, Debug)]
+pub struct MTLClearColor {
+    pub red: f64,
+    pub green: f64,
+    pub blue: f64,
+    pub alpha: f64,
+}
+
+impl MTLClearColor {
+    #[inline]
+    pub fn new(red: f64, green: f64, blue: f64, alpha: f64) -> Self {
+        Self {
+            red,
+            green,
+            blue,
+            alpha,
+        }
+    }
+}
+
+#[repr(u32)]
+#[allow(non_camel_case_types)]
+pub enum MTLMultisampleStencilResolveFilter {
+    Sample0 = 0,
+    DepthResolvedSample = 1,
+}
+
+pub enum MTLRenderPassAttachmentDescriptor {}
+
+foreign_obj_type! {
+    type CType = MTLRenderPassAttachmentDescriptor;
+    pub struct RenderPassAttachmentDescriptor;
+    pub struct RenderPassAttachmentDescriptorRef;
+}
+
+impl RenderPassAttachmentDescriptorRef {
+    pub fn texture(&self) -> Option<&TextureRef> {
+        unsafe { msg_send![self, texture] }
+    }
+
+    pub fn set_texture(&self, texture: Option<&TextureRef>) {
+        unsafe { msg_send![self, setTexture: texture] }
+    }
+
+    pub fn level(&self) -> NSUInteger {
+        unsafe { msg_send![self, level] }
+    }
+
+    pub fn set_level(&self, level: NSUInteger) {
+        unsafe { msg_send![self, setLevel: level] }
+    }
+
+    pub fn slice(&self) -> NSUInteger {
+        unsafe { msg_send![self, slice] }
+    }
+
+    pub fn set_slice(&self, slice: NSUInteger) {
+        unsafe { msg_send![self, setSlice: slice] }
+    }
+
+    pub fn depth_plane(&self) -> NSUInteger {
+        unsafe { msg_send![self, depthPlane] }
+    }
+
+    pub fn set_depth_plane(&self, depth_plane: NSUInteger) {
+        unsafe { msg_send![self, setDepthPlane: depth_plane] }
+    }
+
+    pub fn resolve_texture(&self) -> Option<&TextureRef> {
+        unsafe { msg_send![self, resolveTexture] }
+    }
+
+    pub fn set_resolve_texture(&self, resolve_texture: Option<&TextureRef>) {
+        unsafe { msg_send![self, setResolveTexture: resolve_texture] }
+    }
+
+    pub fn resolve_level(&self) -> NSUInteger {
+        unsafe { msg_send![self, resolveLevel] }
+    }
+
+    pub fn set_resolve_level(&self, resolve_level: NSUInteger) {
+        unsafe { msg_send![self, setResolveLevel: resolve_level] }
+    }
+
+    pub fn resolve_slice(&self) -> NSUInteger {
+        unsafe { msg_send![self, resolveSlice] }
+    }
+
+    pub fn set_resolve_slice(&self, resolve_slice: NSUInteger) {
+        unsafe { msg_send![self, setResolveSlice: resolve_slice] }
+    }
+
+    pub fn resolve_depth_plane(&self) -> NSUInteger {
+        unsafe { msg_send![self, resolveDepthPlane] }
+    }
+
+    pub fn set_resolve_depth_plane(&self, resolve_depth_plane: NSUInteger) {
+        unsafe { msg_send![self, setResolveDepthPlane: resolve_depth_plane] }
+    }
+
+    pub fn load_action(&self) -> MTLLoadAction {
+        unsafe { msg_send![self, loadAction] }
+    }
+
+    pub fn set_load_action(&self, load_action: MTLLoadAction) {
+        unsafe { msg_send![self, setLoadAction: load_action] }
+    }
+
+    pub fn store_action(&self) -> MTLStoreAction {
+        unsafe { msg_send![self, storeAction] }
+    }
+
+    pub fn set_store_action(&self, store_action: MTLStoreAction) {
+        unsafe { msg_send![self, setStoreAction: store_action] }
+    }
+}
+
+pub enum MTLRenderPassColorAttachmentDescriptor {}
+
+foreign_obj_type! {
+    type CType = MTLRenderPassColorAttachmentDescriptor;
+    pub struct RenderPassColorAttachmentDescriptor;
+    pub struct RenderPassColorAttachmentDescriptorRef;
+    type ParentType = RenderPassAttachmentDescriptorRef;
+}
+
+impl RenderPassColorAttachmentDescriptor {
+    pub fn new() -> Self {
+        unsafe {
+            let class = class!(MTLRenderPassColorAttachmentDescriptor);
+            msg_send![class, new]
+        }
+    }
+}
+
+impl RenderPassColorAttachmentDescriptorRef {
+    pub fn clear_color(&self) -> MTLClearColor {
+        unsafe { msg_send![self, clearColor] }
+    }
+
+    pub fn set_clear_color(&self, clear_color: MTLClearColor) {
+        unsafe { msg_send![self, setClearColor: clear_color] }
+    }
+}
+
+pub enum MTLRenderPassDepthAttachmentDescriptor {}
+
+foreign_obj_type! {
+    type CType = MTLRenderPassDepthAttachmentDescriptor;
+    pub struct RenderPassDepthAttachmentDescriptor;
+    pub struct RenderPassDepthAttachmentDescriptorRef;
+    type ParentType = RenderPassAttachmentDescriptorRef;
+}
+
+impl RenderPassDepthAttachmentDescriptorRef {
+    pub fn clear_depth(&self) -> f64 {
+        unsafe { msg_send![self, clearDepth] }
+    }
+
+    pub fn set_clear_depth(&self, clear_depth: f64) {
+        unsafe { msg_send![self, setClearDepth: clear_depth] }
+    }
+}
+
+pub enum MTLRenderPassStencilAttachmentDescriptor {}
+
+foreign_obj_type! {
+    type CType = MTLRenderPassStencilAttachmentDescriptor;
+    pub struct RenderPassStencilAttachmentDescriptor;
+    pub struct RenderPassStencilAttachmentDescriptorRef;
+    type ParentType = RenderPassAttachmentDescriptorRef;
+}
+
+impl RenderPassStencilAttachmentDescriptorRef {
+    pub fn clear_stencil(&self) -> u32 {
+        unsafe { msg_send![self, clearStencil] }
+    }
+
+    pub fn set_clear_stencil(&self, clear_stencil: u32) {
+        unsafe { msg_send![self, setClearStencil: clear_stencil] }
+    }
+
+    pub fn stencil_resolve_filter(&self) -> MTLMultisampleStencilResolveFilter {
+        unsafe { msg_send![self, stencilResolveFilter] }
+    }
+
+    pub fn set_stencil_resolve_filter(
+        &self,
+        stencil_resolve_filter: MTLMultisampleStencilResolveFilter,
+    ) {
+        unsafe { msg_send![self, setStencilResolveFilter: stencil_resolve_filter] }
+    }
+}
+
+pub enum MTLRenderPassColorAttachmentDescriptorArray {}
+
+foreign_obj_type! {
+    type CType = MTLRenderPassColorAttachmentDescriptorArray;
+    pub struct RenderPassColorAttachmentDescriptorArray;
+    pub struct RenderPassColorAttachmentDescriptorArrayRef;
+}
+
+impl RenderPassColorAttachmentDescriptorArrayRef {
+    pub fn object_at(&self, index: NSUInteger) -> Option<&RenderPassColorAttachmentDescriptorRef> {
+        unsafe { msg_send![self, objectAtIndexedSubscript: index] }
+    }
+
+    pub fn set_object_at(
+        &self,
+        index: NSUInteger,
+        attachment: Option<&RenderPassColorAttachmentDescriptorRef>,
+    ) {
+        unsafe {
+            msg_send![self, setObject:attachment
+                     atIndexedSubscript:index]
+        }
+    }
+}
+
+pub enum MTLRenderPassDescriptor {}
+
+foreign_obj_type! {
+    type CType = MTLRenderPassDescriptor;
+    pub struct RenderPassDescriptor;
+    pub struct RenderPassDescriptorRef;
+}
+
+impl RenderPassDescriptor {
+    pub fn new<'a>() -> &'a RenderPassDescriptorRef {
+        unsafe {
+            let class = class!(MTLRenderPassDescriptorInternal);
+            msg_send![class, renderPassDescriptor]
+        }
+    }
+}
+
+impl RenderPassDescriptorRef {
+    pub fn color_attachments(&self) -> &RenderPassColorAttachmentDescriptorArrayRef {
+        unsafe { msg_send![self, colorAttachments] }
+    }
+
+    pub fn depth_attachment(&self) -> Option<&RenderPassDepthAttachmentDescriptorRef> {
+        unsafe { msg_send![self, depthAttachment] }
+    }
+
+    pub fn set_depth_attachment(
+        &self,
+        depth_attachment: Option<&RenderPassDepthAttachmentDescriptorRef>,
+    ) {
+        unsafe { msg_send![self, setDepthAttachment: depth_attachment] }
+    }
+
+    pub fn stencil_attachment(&self) -> Option<&RenderPassStencilAttachmentDescriptorRef> {
+        unsafe { msg_send![self, stencilAttachment] }
+    }
+
+    pub fn set_stencil_attachment(
+        &self,
+        stencil_attachment: Option<&RenderPassStencilAttachmentDescriptorRef>,
+    ) {
+        unsafe { msg_send![self, setStencilAttachment: stencil_attachment] }
+    }
+
+    pub fn visibility_result_buffer(&self) -> Option<&BufferRef> {
+        unsafe { msg_send![self, visibilityResultBuffer] }
+    }
+
+    pub fn set_visibility_result_buffer(&self, buffer: Option<&BufferRef>) {
+        unsafe { msg_send![self, setVisibilityResultBuffer: buffer] }
+    }
+
+    pub fn render_target_array_length(&self) -> NSUInteger {
+        unsafe { msg_send![self, renderTargetArrayLength] }
+    }
+
+    pub fn set_render_target_array_length(&self, length: NSUInteger) {
+        unsafe { msg_send![self, setRenderTargetArrayLength: length] }
+    }
+
+    pub fn render_target_width(&self) -> NSUInteger {
+        unsafe { msg_send![self, renderTargetWidth] }
+    }
+
+    pub fn set_render_target_width(&self, size: NSUInteger) {
+        unsafe { msg_send![self, setRenderTargetWidth: size] }
+    }
+
+    pub fn render_target_height(&self) -> NSUInteger {
+        unsafe { msg_send![self, renderTargetHeight] }
+    }
+
+    pub fn set_render_target_height(&self, size: NSUInteger) {
+        unsafe { msg_send![self, setRenderTargetHeight: size] }
+    }
+
+    pub fn default_raster_sample_count(&self) -> NSUInteger {
+        unsafe { msg_send![self, defaultRasterSampleCount] }
+    }
+
+    pub fn set_default_raster_sample_count(&self, count: NSUInteger) {
+        unsafe { msg_send![self, setDefaultRasterSampleCount: count] }
+    }
+}
diff --git a/third_party/rust/metal/src/resource.rs b/third_party/rust/metal/src/resource.rs
new file mode 100644
index 0000000000..07974b4225
--- /dev/null
+++ b/third_party/rust/metal/src/resource.rs
@@ -0,0 +1,115 @@
+// Copyright 2016 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+use super::DeviceRef;
+use cocoa_foundation::foundation::NSUInteger;
+
+#[repr(u64)]
+#[allow(non_camel_case_types)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
+pub enum MTLPurgeableState {
+    KeepCurrent = 1,
+    NonVolatile = 2,
+    Volatile = 3,
+    Empty = 4,
+}
+
+#[repr(u64)]
+#[allow(non_camel_case_types)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
+pub enum MTLCPUCacheMode {
+    DefaultCache = 0,
+    WriteCombined = 1,
+}
+
+#[repr(u64)]
+#[allow(non_camel_case_types)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
+pub enum MTLStorageMode {
+    Shared = 0,
+    Managed = 1,
+    Private = 2,
+    Memoryless = 3,
+}
+
+pub const MTLResourceCPUCacheModeShift: NSUInteger = 0;
+pub const MTLResourceCPUCacheModeMask: NSUInteger = 0xf << MTLResourceCPUCacheModeShift;
+pub const MTLResourceStorageModeShift: NSUInteger = 4;
+pub const MTLResourceStorageModeMask: NSUInteger = 0xf << MTLResourceStorageModeShift;
+
+bitflags! {
+    #[allow(non_upper_case_globals)]
+    pub struct MTLResourceOptions: NSUInteger {
+        const CPUCacheModeDefaultCache  = (MTLCPUCacheMode::DefaultCache as NSUInteger) << MTLResourceCPUCacheModeShift;
+        const CPUCacheModeWriteCombined = (MTLCPUCacheMode::WriteCombined as NSUInteger) << MTLResourceCPUCacheModeShift;
+
+        const StorageModeShared  = (MTLStorageMode::Shared as NSUInteger)  << MTLResourceStorageModeShift;
+        const StorageModeManaged = (MTLStorageMode::Managed as NSUInteger) << MTLResourceStorageModeShift;
+        const StorageModePrivate = (MTLStorageMode::Private as NSUInteger) << MTLResourceStorageModeShift;
+        const StorageModeMemoryless = (MTLStorageMode::Memoryless as NSUInteger) << MTLResourceStorageModeShift;
+    }
+}
+
+bitflags! {
+    pub struct MTLResourceUsage: NSUInteger {
+        const Read   = 1 << 0;
+        const Write  = 1 << 1;
+        const Sample = 1 << 2;
+    }
+}
+
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
+#[repr(C)]
+pub struct MTLSizeAndAlign {
+    pub size: NSUInteger,
+    pub align: NSUInteger,
+}
+
+pub enum MTLResource {}
+
+foreign_obj_type! {
+    type CType = MTLResource;
+    pub struct Resource;
+    pub struct ResourceRef;
+}
+
+impl ResourceRef {
+    pub fn device(&self) -> &DeviceRef {
+        unsafe { msg_send![self, device] }
+    }
+
+    pub fn label(&self) -> &str {
+        unsafe {
+            let label = msg_send![self, label];
+            crate::nsstring_as_str(label)
+        }
+    }
+
+    pub fn set_label(&self, label: &str) {
+        unsafe {
+            let nslabel = crate::nsstring_from_str(label);
+            let () = msg_send![self, setLabel: nslabel];
+        }
+    }
+
+    pub fn cpu_cache_mode(&self) -> MTLCPUCacheMode {
+        unsafe { msg_send![self, cpuCacheMode] }
+    }
+
+    pub fn storage_mode(&self) -> MTLStorageMode {
+        unsafe { msg_send![self, storageMode] }
+    }
+
+    pub fn set_purgeable_state(&self, state: MTLPurgeableState) -> MTLPurgeableState {
+        unsafe { msg_send![self, setPurgeableState: state] }
+    }
+
+    /// Only available on macOS 10.13+ & iOS 10.11+
+    pub fn allocated_size(&self) -> NSUInteger {
+        unsafe { msg_send![self, allocatedSize] }
+    }
+}
diff --git a/third_party/rust/metal/src/sampler.rs b/third_party/rust/metal/src/sampler.rs
new file mode 100644
index 0000000000..f0d61a5396
--- /dev/null
+++ b/third_party/rust/metal/src/sampler.rs
@@ -0,0 +1,132 @@
+// Copyright 2016 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+use cocoa_foundation::foundation::NSUInteger;
+
+use crate::depthstencil::MTLCompareFunction;
+
+#[repr(u64)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+pub enum MTLSamplerMinMagFilter {
+    Nearest = 0,
+    Linear = 1,
+}
+
+#[repr(u64)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+pub enum MTLSamplerMipFilter {
+    NotMipmapped = 0,
+    Nearest = 1,
+    Linear = 2,
+}
+
+#[repr(u64)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+pub enum MTLSamplerAddressMode {
+    ClampToEdge = 0,
+    MirrorClampToEdge = 1,
+    Repeat = 2,
+    MirrorRepeat = 3,
+    ClampToZero = 4,
+    ClampToBorderColor = 5,
+}
+
+#[repr(u64)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+pub enum MTLSamplerBorderColor {
+    TransparentBlack = 0,
+    OpaqueBlack = 1,
+    OpaqueWhite = 2,
+}
+
+pub enum MTLSamplerDescriptor {}
+
+foreign_obj_type! {
+    type CType = MTLSamplerDescriptor;
+    pub struct SamplerDescriptor;
+    pub struct SamplerDescriptorRef;
+}
+
+impl SamplerDescriptor {
+    pub fn new() -> Self {
+        unsafe {
+            let class = class!(MTLSamplerDescriptor);
+            msg_send![class, new]
+        }
+    }
+}
+
+impl SamplerDescriptorRef {
+    pub fn set_min_filter(&self, filter: MTLSamplerMinMagFilter) {
+        unsafe { msg_send![self, setMinFilter: filter] }
+    }
+
+    pub fn set_mag_filter(&self, filter: MTLSamplerMinMagFilter) {
+        unsafe { msg_send![self, setMagFilter: filter] }
+    }
+
+    pub fn set_mip_filter(&self, filter: MTLSamplerMipFilter) {
+        unsafe { msg_send![self, setMipFilter: filter] }
+    }
+
+    pub fn set_address_mode_s(&self, mode: MTLSamplerAddressMode) {
+        unsafe { msg_send![self, setSAddressMode: mode] }
+    }
+
+    pub fn set_address_mode_t(&self, mode: MTLSamplerAddressMode) {
+        unsafe { msg_send![self, setTAddressMode: mode] }
+    }
+
+    pub fn set_address_mode_r(&self, mode: MTLSamplerAddressMode) {
+        unsafe { msg_send![self, setRAddressMode: mode] }
+    }
+
+    pub fn set_max_anisotropy(&self, anisotropy: NSUInteger) {
+        unsafe { msg_send![self, setMaxAnisotropy: anisotropy] }
+    }
+
+    pub fn set_compare_function(&self, func: MTLCompareFunction) {
+        unsafe { msg_send![self, setCompareFunction: func] }
+    }
+
+    #[cfg(feature = "private")]
+    pub unsafe fn set_lod_bias(&self, bias: f32) {
+        msg_send![self, setLodBias: bias]
+    }
+
+    pub fn set_lod_min_clamp(&self, clamp: f32) {
+        unsafe { msg_send![self, setLodMinClamp: clamp] }
+    }
+
+    pub fn set_lod_max_clamp(&self, clamp: f32) {
+        unsafe { msg_send![self, setLodMaxClamp: clamp] }
+    }
+
+    pub fn set_lod_average(&self, enable: bool) {
+        unsafe { msg_send![self, setLodAverage: enable] }
+    }
+
+    pub fn set_normalized_coordinates(&self, enable: bool) {
+        unsafe { msg_send![self, setNormalizedCoordinates: enable] }
+    }
+
+    pub fn set_support_argument_buffers(&self, enable: bool) {
+        unsafe { msg_send![self, setSupportArgumentBuffers: enable] }
+    }
+
+    pub fn set_border_color(&self, color: MTLSamplerBorderColor) {
+        unsafe { msg_send![self, setBorderColor: color] }
+    }
+}
+
+pub enum MTLSamplerState {}
+
+foreign_obj_type! {
+    type CType = MTLSamplerState;
+    pub struct SamplerState;
+    pub struct SamplerStateRef;
+}
diff --git a/third_party/rust/metal/src/texture.rs b/third_party/rust/metal/src/texture.rs
new file mode 100644
index 0000000000..4d338f5082
--- /dev/null
+++ b/third_party/rust/metal/src/texture.rs
@@ -0,0 +1,324 @@
+// Copyright 2016 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+use super::*;
+
+use cocoa_foundation::foundation::{NSRange, NSUInteger};
+use objc::runtime::{NO, YES};
+
+#[repr(u64)]
+#[allow(non_camel_case_types)]
+#[derive(Copy, Clone, Debug, Hash, PartialEq, Eq)]
+pub enum MTLTextureType {
+    D1 = 0,
+    D1Array = 1,
+    D2 = 2,
+    D2Array = 3,
+    D2Multisample = 4,
+    Cube = 5,
+    CubeArray = 6,
+    D3 = 7,
+}
+
+bitflags! {
+    pub struct MTLTextureUsage: NSUInteger {
+        const Unknown         = 0x0000;
+        const ShaderRead      = 0x0001;
+        const ShaderWrite     = 0x0002;
+        const RenderTarget    = 0x0004;
+        const PixelFormatView = 0x0010;
+    }
+}
+
+pub enum MTLTextureDescriptor {}
+
+foreign_obj_type! {
+    type CType = MTLTextureDescriptor;
+    pub struct TextureDescriptor;
+    pub struct TextureDescriptorRef;
+}
+
+impl TextureDescriptor {
+    pub fn new() -> Self {
+        unsafe {
+            let class = class!(MTLTextureDescriptor);
+            msg_send![class, new]
+        }
+    }
+}
+
+impl TextureDescriptorRef {
+    pub fn texture_type(&self) -> MTLTextureType {
+        unsafe { msg_send![self, textureType] }
+    }
+
+    pub fn set_texture_type(&self, texture_type: MTLTextureType) {
+        unsafe { msg_send![self, setTextureType: texture_type] }
+    }
+
+    pub fn pixel_format(&self) -> MTLPixelFormat {
+        unsafe { msg_send![self, pixelFormat] }
+    }
+
+    pub fn set_pixel_format(&self, pixel_format: MTLPixelFormat) {
+        unsafe { msg_send![self, setPixelFormat: pixel_format] }
+    }
+
+    pub fn width(&self) -> NSUInteger {
+        unsafe { msg_send![self, width] }
+    }
+
+    pub fn set_width(&self, width: NSUInteger) {
+        unsafe { msg_send![self, setWidth: width] }
+    }
+
+    pub fn height(&self) -> NSUInteger {
+        unsafe { msg_send![self, height] }
+    }
+
+    pub fn set_height(&self, height: NSUInteger) {
+        unsafe { msg_send![self, setHeight: height] }
+    }
+
+    pub fn depth(&self) -> NSUInteger {
+        unsafe { msg_send![self, depth] }
+    }
+
+    pub fn set_depth(&self, depth: NSUInteger) {
+        unsafe { msg_send![self, setDepth: depth] }
+    }
+
+    pub fn mipmap_level_count(&self) -> NSUInteger {
+        unsafe { msg_send![self, mipmapLevelCount] }
+    }
+
+    pub fn set_mipmap_level_count(&self, count: NSUInteger) {
+        unsafe { msg_send![self, setMipmapLevelCount: count] }
+    }
+
+    pub fn sample_count(&self) -> NSUInteger {
+        unsafe { msg_send![self, sampleCount] }
+    }
+
+    pub fn set_sample_count(&self, count: NSUInteger) {
+        unsafe { msg_send![self, setSampleCount: count] }
+    }
+
+    pub fn array_length(&self) -> NSUInteger {
+        unsafe { msg_send![self, arrayLength] }
+    }
+
+    pub fn set_array_length(&self, length: NSUInteger) {
+        unsafe { msg_send![self, setArrayLength: length] }
+    }
+
+    pub fn resource_options(&self) -> MTLResourceOptions {
+        unsafe { msg_send![self, resourceOptions] }
+    }
+
+    pub fn set_resource_options(&self, options: MTLResourceOptions) {
+        unsafe { msg_send![self, setResourceOptions: options] }
+    }
+
+    pub fn cpu_cache_mode(&self) -> MTLCPUCacheMode {
+        unsafe { msg_send![self, cpuCacheMode] }
+    }
+
+    pub fn set_cpu_cache_mode(&self, mode: MTLCPUCacheMode) {
+        unsafe { msg_send![self, setCpuCacheMode: mode] }
+    }
+
+    pub fn storage_mode(&self) -> MTLStorageMode {
+        unsafe { msg_send![self, storageMode] }
+    }
+
+    pub fn set_storage_mode(&self, mode: MTLStorageMode) {
+        unsafe { msg_send![self, setStorageMode: mode] }
+    }
+
+    pub fn usage(&self) -> MTLTextureUsage {
+        unsafe { msg_send![self, usage] }
+    }
+
+    pub fn set_usage(&self, usage: MTLTextureUsage) {
+        unsafe { msg_send![self, setUsage: usage] }
+    }
+}
+
+pub enum MTLTexture {}
+
+foreign_obj_type! {
+    type CType = MTLTexture;
+    pub struct Texture;
+    pub struct TextureRef;
+    type ParentType = ResourceRef;
+}
+
+impl TextureRef {
+    #[deprecated(since = "0.13.0")]
+    pub fn root_resource(&self) -> Option<&ResourceRef> {
+        unsafe { msg_send![self, rootResource] }
+    }
+
+    pub fn parent_texture(&self) -> Option<&TextureRef> {
+        unsafe { msg_send![self, parentTexture] }
+    }
+
+    pub fn parent_relative_level(&self) -> NSUInteger {
+        unsafe { msg_send![self, parentRelativeLevel] }
+    }
+
+    pub fn parent_relative_slice(&self) -> NSUInteger {
+        unsafe { msg_send![self, parentRelativeSlice] }
+    }
+
+    pub fn buffer(&self) -> Option<&BufferRef> {
+        unsafe { msg_send![self, buffer] }
+    }
+
+    pub fn buffer_offset(&self) -> NSUInteger {
+        unsafe { msg_send![self, bufferOffset] }
+    }
+
+    pub fn buffer_stride(&self) -> NSUInteger {
+        unsafe { msg_send![self, bufferBytesPerRow] }
+    }
+
+    pub fn texture_type(&self) -> MTLTextureType {
+        unsafe { msg_send![self, textureType] }
+    }
+
+    pub fn pixel_format(&self) -> MTLPixelFormat {
+        unsafe { msg_send![self, pixelFormat] }
+    }
+
+    pub fn width(&self) -> NSUInteger {
+        unsafe { msg_send![self, width] }
+    }
+
+    pub fn height(&self) -> NSUInteger {
+        unsafe { msg_send![self, height] }
+    }
+
+    pub fn depth(&self) -> NSUInteger {
+        unsafe { msg_send![self, depth] }
+    }
+
+    pub fn mipmap_level_count(&self) -> NSUInteger {
+        unsafe { msg_send![self, mipmapLevelCount] }
+    }
+
+    pub fn sample_count(&self) -> NSUInteger {
+        unsafe { msg_send![self, sampleCount] }
+    }
+
+    pub fn array_length(&self) -> NSUInteger {
+        unsafe { msg_send![self, arrayLength] }
+    }
+
+    pub fn usage(&self) -> MTLTextureUsage {
+        unsafe { msg_send![self, usage] }
+    }
+
+    /// [framebufferOnly Apple Docs](https://developer.apple.com/documentation/metal/mtltexture/1515749-framebufferonly?language=objc)
+    pub fn framebuffer_only(&self) -> bool {
+        unsafe {
+            match msg_send![self, isFramebufferOnly] {
+                YES => true,
+                NO => false,
+                _ => unreachable!(),
+            }
+        }
+    }
+
+    pub fn get_bytes(
+        &self,
+        bytes: *mut std::ffi::c_void,
+        stride: NSUInteger,
+        region: MTLRegion,
+        mipmap_level: NSUInteger,
+    ) {
+        unsafe {
+            msg_send![self, getBytes:bytes
+                         bytesPerRow:stride
+                          fromRegion:region
+                         mipmapLevel:mipmap_level]
+        }
+    }
+
+    pub fn get_bytes_in_slice(
+        &self,
+        bytes: *mut std::ffi::c_void,
+        stride: NSUInteger,
+        image_stride: NSUInteger,
+        region: MTLRegion,
+        mipmap_level: NSUInteger,
+        slice: NSUInteger,
+    ) {
+        unsafe {
+            msg_send![self, getBytes:bytes
+                         bytesPerRow:stride
+                       bytesPerImage:image_stride
+                          fromRegion:region
+                         mipmapLevel:mipmap_level
+                               slice:slice]
+        }
+    }
+
+    pub fn replace_region(
+        &self,
+        region: MTLRegion,
+        mipmap_level: NSUInteger,
+        bytes: *const std::ffi::c_void,
+        stride: NSUInteger,
+    ) {
+        unsafe {
+            msg_send![self, replaceRegion:region
+                              mipmapLevel:mipmap_level
+                                withBytes:bytes
+                              bytesPerRow:stride]
+        }
+    }
+
+    pub fn replace_region_in_slice(
+        &self,
+        region: MTLRegion,
+        mipmap_level: NSUInteger,
+        slice: NSUInteger,
+        bytes: *const std::ffi::c_void,
+        stride: NSUInteger,
+        image_stride: NSUInteger,
+    ) {
+        unsafe {
+            msg_send![self, replaceRegion:region
+                              mipmapLevel:mipmap_level
+                                    slice:slice
+                                withBytes:bytes
+                              bytesPerRow:stride
+                            bytesPerImage:image_stride]
+        }
+    }
+
+    pub fn new_texture_view(&self, pixel_format: MTLPixelFormat) -> Texture {
+        unsafe { msg_send![self, newTextureViewWithPixelFormat: pixel_format] }
+    }
+
+    pub fn new_texture_view_from_slice(
+        &self,
+        pixel_format: MTLPixelFormat,
+        texture_type: MTLTextureType,
+        mipmap_levels: NSRange,
+        slices: NSRange,
+    ) -> Texture {
+        unsafe {
+            msg_send![self, newTextureViewWithPixelFormat:pixel_format
+                                                textureType:texture_type
+                                                     levels:mipmap_levels
+                                                     slices:slices]
+        }
+    }
+}
diff --git a/third_party/rust/metal/src/types.rs b/third_party/rust/metal/src/types.rs
new file mode 100644
index 0000000000..313a5eaf82
--- /dev/null
+++ b/third_party/rust/metal/src/types.rs
@@ -0,0 +1,39 @@
+// Copyright 2016 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+use cocoa_foundation::foundation::NSUInteger;
+use std::default::Default;
+
+#[repr(C)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash, Default)]
+pub struct MTLOrigin {
+    pub x: NSUInteger,
+    pub y: NSUInteger,
+    pub z: NSUInteger,
+}
+
+#[repr(C)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash, Default)]
+pub struct MTLSize {
+    pub width: NSUInteger,
+    pub height: NSUInteger,
+    pub depth: NSUInteger,
+}
+
+#[repr(C)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash, Default)]
+pub struct MTLRegion {
+    pub origin: MTLOrigin,
+    pub size: MTLSize,
+}
+
+#[repr(C)]
+#[derive(Copy, Clone, Debug)]
+pub struct MTLSamplePosition {
+    pub x: f32,
+    pub y: f32,
+}
diff --git a/third_party/rust/metal/src/vertexdescriptor.rs b/third_party/rust/metal/src/vertexdescriptor.rs
new file mode 100644
index 0000000000..5fba52f659
--- /dev/null
+++ b/third_party/rust/metal/src/vertexdescriptor.rs
@@ -0,0 +1,248 @@
+// Copyright 2016 GFX developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+use cocoa_foundation::foundation::NSUInteger;
+
+#[repr(u64)]
+#[allow(non_camel_case_types)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+pub enum MTLVertexFormat {
+    Invalid = 0,
+    UChar2 = 1,
+    UChar3 = 2,
+    UChar4 = 3,
+    Char2 = 4,
+    Char3 = 5,
+    Char4 = 6,
+    UChar2Normalized = 7,
+    UChar3Normalized = 8,
+    UChar4Normalized = 9,
+    Char2Normalized = 10,
+    Char3Normalized = 11,
+    Char4Normalized = 12,
+    UShort2 = 13,
+    UShort3 = 14,
+    UShort4 = 15,
+    Short2 = 16,
+    Short3 = 17,
+    Short4 = 18,
+    UShort2Normalized = 19,
+    UShort3Normalized = 20,
+    UShort4Normalized = 21,
+    Short2Normalized = 22,
+    Short3Normalized = 23,
+    Short4Normalized = 24,
+    Half2 = 25,
+    Half3 = 26,
+    Half4 = 27,
+    Float = 28,
+    Float2 = 29,
+    Float3 = 30,
+    Float4 = 31,
+    Int = 32,
+    Int2 = 33,
+    Int3 = 34,
+    Int4 = 35,
+    UInt = 36,
+    UInt2 = 37,
+    UInt3 = 38,
+    UInt4 = 39,
+    Int1010102Normalized = 40,
+    UInt1010102Normalized = 41,
+    UChar4Normalized_BGRA = 42,
+    UChar = 45,
+    Char = 46,
+    UCharNormalized = 47,
+    CharNormalized = 48,
+    UShort = 49,
+    Short = 50,
+    UShortNormalized = 51,
+    ShortNormalized = 52,
+    Half = 53,
+}
+
+#[repr(u64)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+pub enum MTLVertexStepFunction {
+    Constant = 0,
+    PerVertex = 1,
+    PerInstance = 2,
+    PerPatch = 3,
+    PerPatchControlPoint = 4,
+}
+
+pub enum MTLVertexBufferLayoutDescriptor {}
+
+foreign_obj_type! {
+    type CType = MTLVertexBufferLayoutDescriptor;
+    pub struct VertexBufferLayoutDescriptor;
+    pub struct VertexBufferLayoutDescriptorRef;
+}
+
+impl VertexBufferLayoutDescriptor {
+    pub fn new() -> Self {
+        unsafe {
+            let class = class!(MTLVertexBufferLayoutDescriptor);
+            msg_send![class, new]
+        }
+    }
+}
+
+impl VertexBufferLayoutDescriptorRef {
+    pub fn stride(&self) -> NSUInteger {
+        unsafe { msg_send![self, stride] }
+    }
+
+    pub fn set_stride(&self, stride: NSUInteger) {
+        unsafe { msg_send![self, setStride: stride] }
+    }
+
+    pub fn step_function(&self) -> MTLVertexStepFunction {
+        unsafe { msg_send![self, stepFunction] }
+    }
+
+    pub fn set_step_function(&self, func: MTLVertexStepFunction) {
+        unsafe { msg_send![self, setStepFunction: func] }
+    }
+
+    pub fn step_rate(&self) -> NSUInteger {
+        unsafe { msg_send![self, stepRate] }
+    }
+
+    pub fn set_step_rate(&self, step_rate: NSUInteger) {
+        unsafe { msg_send![self, setStepRate: step_rate] }
+    }
+}
+
+pub enum MTLVertexBufferLayoutDescriptorArray {}
+
+foreign_obj_type! {
+    type CType = MTLVertexBufferLayoutDescriptorArray;
+    pub struct VertexBufferLayoutDescriptorArray;
+    pub struct VertexBufferLayoutDescriptorArrayRef;
+}
+
+impl VertexBufferLayoutDescriptorArrayRef {
+    pub fn object_at(&self, index: NSUInteger) -> Option<&VertexBufferLayoutDescriptorRef> {
+        unsafe { msg_send![self, objectAtIndexedSubscript: index] }
+    }
+
+    pub fn set_object_at(
+        &self,
+        index: NSUInteger,
+        layout: Option<&VertexBufferLayoutDescriptorRef>,
+    ) {
+        unsafe {
+            msg_send![self, setObject:layout
+                   atIndexedSubscript:index]
+        }
+    }
+}
+
+pub enum MTLVertexAttributeDescriptor {}
+
+foreign_obj_type! {
+    type CType = MTLVertexAttributeDescriptor;
+    pub struct VertexAttributeDescriptor;
+    pub struct VertexAttributeDescriptorRef;
+}
+
+impl VertexAttributeDescriptor {
+    pub fn new() -> Self {
+        unsafe {
+            let class = class!(MTLVertexAttributeDescriptor);
+            msg_send![class, new]
+        }
+    }
+}
+
+impl VertexAttributeDescriptorRef {
+    pub fn format(&self) -> MTLVertexFormat {
+        unsafe { msg_send![self, format] }
+    }
+
+    pub fn set_format(&self, format: MTLVertexFormat) {
+        unsafe { msg_send![self, setFormat: format] }
+    }
+
+    pub fn offset(&self) -> NSUInteger {
+        unsafe { msg_send![self, offset] }
+    }
+
+    pub fn set_offset(&self, offset: NSUInteger) {
+        unsafe { msg_send![self, setOffset: offset] }
+    }
+
+    pub fn buffer_index(&self) -> NSUInteger {
+        unsafe { msg_send![self, bufferIndex] }
+    }
+
+    pub fn set_buffer_index(&self, index: NSUInteger) {
+        unsafe { msg_send![self, setBufferIndex: index] }
+    }
+}
+
+pub enum MTLVertexAttributeDescriptorArray {}
+
+foreign_obj_type! {
+    type CType = MTLVertexAttributeDescriptorArray;
+    pub struct VertexAttributeDescriptorArray;
+    pub struct VertexAttributeDescriptorArrayRef;
+}
+
+impl VertexAttributeDescriptorArrayRef {
+    pub fn object_at(&self, index: NSUInteger) -> Option<&VertexAttributeDescriptorRef> {
+        unsafe { msg_send![self, objectAtIndexedSubscript: index] }
+    }
+
+    pub fn set_object_at(
+        &self,
+        index: NSUInteger,
+        attribute: Option<&VertexAttributeDescriptorRef>,
+    ) {
+        unsafe {
+            msg_send![self, setObject:attribute
+                   atIndexedSubscript:index]
+        }
+    }
+}
+
+pub enum MTLVertexDescriptor {}
+
+foreign_obj_type! {
+    type CType = MTLVertexDescriptor;
+    pub struct VertexDescriptor;
+    pub struct VertexDescriptorRef;
+}
+
+impl VertexDescriptor {
+    pub fn new<'a>() -> &'a VertexDescriptorRef {
+        unsafe {
+            let class = class!(MTLVertexDescriptor);
+            msg_send![class, vertexDescriptor]
+        }
+    }
+}
+
+impl VertexDescriptorRef {
+    pub fn layouts(&self) -> &VertexBufferLayoutDescriptorArrayRef {
+        unsafe { msg_send![self, layouts] }
+    }
+
+    pub fn attributes(&self) -> &VertexAttributeDescriptorArrayRef {
+        unsafe { msg_send![self, attributes] }
+    }
+
+    #[cfg(feature = "private")]
+    pub unsafe fn serialize_descriptor(&self) -> *mut std::ffi::c_void {
+        msg_send![self, newSerializedDescriptor]
+    }
+
+    pub fn reset(&self) {
+        unsafe { msg_send![self, reset] }
+    }
+}