1 files changed, 549 insertions, 0 deletions
diff --git a/third_party/rust/metal/src/lib.rs b/third_party/rust/metal/src/lib.rs
new file mode 100644
index 0000000000..bc8427922c
--- /dev/null
+++ b/third_party/rust/metal/src/lib.rs
@@ -0,0 +1,549 @@
+// 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},
+    marker::PhantomData,
+    mem,
+    ops::Deref,
+    os::raw::c_void,
+};
+
+use core_graphics_types::{base::CGFloat, geometry::CGSize};
+use foreign_types::ForeignType;
+use objc::runtime::{Object, NO, YES};
+
+#[cfg(target_pointer_width = "64")]
+pub type NSInteger = i64;
+#[cfg(not(target_pointer_width = "64"))]
+pub type NSInteger = i32;
+#[cfg(target_pointer_width = "64")]
+pub type NSUInteger = u64;
+#[cfg(target_pointer_width = "32")]
+pub type NSUInteger = u32;
+
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub struct NSRange {
+    pub location: NSUInteger,
+    pub length: NSUInteger,
+}
+
+impl NSRange {
+    #[inline]
+    pub fn new(location: NSUInteger, length: NSUInteger) -> NSRange {
+        NSRange { location, length }
+    }
+}
+
+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 = $parent_ref;
+
+            #[inline]
+            fn deref(&self) -> &$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>;
+
+    #[inline]
+    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 MetalDrawable;
+    pub struct MetalDrawableRef;
+    type ParentType = DrawableRef;
+}
+
+impl MetalDrawableRef {
+    pub fn texture(&self) -> &TextureRef {
+        unsafe { msg_send![self, texture] }
+    }
+}
+
+pub enum CAMetalLayer {}
+
+foreign_obj_type! {
+    type CType = CAMetalLayer;
+    pub struct MetalLayer;
+    pub struct MetalLayerRef;
+}
+
+impl MetalLayer {
+    pub fn new() -> Self {
+        unsafe {
+            let class = class!(CAMetalLayer);
+            msg_send![class, new]
+        }
+    }
+}
+
+impl MetalLayerRef {
+    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 display_sync_enabled(&self) -> bool {
+        unsafe {
+            match msg_send![self, displaySyncEnabled] {
+                YES => true,
+                NO => false,
+                _ => unreachable!(),
+            }
+        }
+    }
+
+    pub fn set_display_sync_enabled(&self, enabled: bool) {
+        unsafe { msg_send![self, setDisplaySyncEnabled: enabled] }
+    }
+
+    pub fn maximum_drawable_count(&self) -> NSUInteger {
+        unsafe { msg_send![self, maximumDrawableCount] }
+    }
+
+    pub fn set_maximum_drawable_count(&self, count: NSUInteger) {
+        unsafe { msg_send![self, setMaximumDrawableCount: count] }
+    }
+
+    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<&MetalDrawableRef> {
+        unsafe { msg_send![self, nextDrawable] }
+    }
+
+    pub fn contents_scale(&self) -> CGFloat {
+        unsafe { msg_send![self, contentsScale] }
+    }
+
+    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 framebuffer_only(&self) -> bool {
+        unsafe {
+            match msg_send![self, framebufferOnly] {
+                YES => true,
+                NO => false,
+                _ => unreachable!(),
+            }
+        }
+    }
+
+    pub fn set_framebuffer_only(&self, framebuffer_only: bool) {
+        unsafe { msg_send![self, setFramebufferOnly: framebuffer_only] }
+    }
+
+    pub fn is_opaque(&self) -> bool {
+        unsafe {
+            match msg_send![self, isOpaque] {
+                YES => true,
+                NO => false,
+                _ => unreachable!(),
+            }
+        }
+    }
+
+    pub fn set_opaque(&self, opaque: bool) {
+        unsafe { msg_send![self, setOpaque: opaque] }
+    }
+
+    pub fn wants_extended_dynamic_range_content(&self) -> bool {
+        unsafe {
+            match msg_send![self, wantsExtendedDynamicRangeContent] {
+                YES => true,
+                NO => false,
+                _ => unreachable!(),
+            }
+        }
+    }
+
+    pub fn set_wants_extended_dynamic_range_content(
+        &self,
+        wants_extended_dynamic_range_content: bool,
+    ) {
+        unsafe {
+            msg_send![
+                self,
+                setWantsExtendedDynamicRangeContent: wants_extended_dynamic_range_content
+            ]
+        }
+    }
+}
+
+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;
+#[cfg(feature = "mps")]
+mod mps;
+mod pipeline;
+mod renderpass;
+mod resource;
+mod sampler;
+mod sync;
+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::*,
+    sync::*,
+};
+
+#[cfg(feature = "mps")]
+pub use mps::*;
+
+#[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;
+
+// TODO: expand supported interface
+pub enum NSURL {}
+
+foreign_obj_type! {
+    type CType = NSURL;
+    pub struct URL;
+    pub struct URLRef;
+}
+
+impl URL {
+    pub fn new_with_string(string: &str) -> Self {
+        unsafe {
+            let ns_str = crate::nsstring_from_str(string);
+            let class = class!(NSURL);
+            msg_send![class, URLWithString: ns_str]
+        }
+    }
+}
+
+impl URLRef {
+    pub fn absolute_string(&self) -> &str {
+        unsafe {
+            let absolute_string = msg_send![self, absoluteString];
+            crate::nsstring_as_str(absolute_string)
+        }
+    }
+}