1 files changed, 176 insertions, 0 deletions
diff --git a/third_party/rust/metal/src/resource.rs b/third_party/rust/metal/src/resource.rs
new file mode 100644
index 0000000000..8986a9c838
--- /dev/null
+++ b/third_party/rust/metal/src/resource.rs
@@ -0,0 +1,176 @@
+// 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, HeapRef, NSUInteger};
+use objc::runtime::{NO, YES};
+
+#[repr(u64)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
+pub enum MTLPurgeableState {
+    KeepCurrent = 1,
+    NonVolatile = 2,
+    Volatile = 3,
+    Empty = 4,
+}
+
+#[repr(u64)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
+pub enum MTLCPUCacheMode {
+    DefaultCache = 0,
+    WriteCombined = 1,
+}
+
+#[repr(u64)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
+pub enum MTLStorageMode {
+    Shared = 0,
+    Managed = 1,
+    Private = 2,
+    /// Only available on macos(11.0), macCatalyst(14.0), ios(10.0)
+    Memoryless = 3,
+}
+
+/// Only available on macos(10.15), ios(13.0)
+#[repr(u64)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
+pub enum MTLHazardTrackingMode {
+    Default = 0,
+    Untracked = 1,
+    Tracked = 2,
+}
+
+pub const MTLResourceCPUCacheModeShift: NSUInteger = 0;
+pub const MTLResourceCPUCacheModeMask: NSUInteger = 0xf << MTLResourceCPUCacheModeShift;
+pub const MTLResourceStorageModeShift: NSUInteger = 4;
+pub const MTLResourceStorageModeMask: NSUInteger = 0xf << MTLResourceStorageModeShift;
+pub const MTLResourceHazardTrackingModeShift: NSUInteger = 8;
+pub const MTLResourceHazardTrackingModeMask: NSUInteger = 0x3 << MTLResourceHazardTrackingModeShift;
+
+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;
+
+        /// Only available on macos(10.13), ios(10.0)
+        const HazardTrackingModeDefault = (MTLHazardTrackingMode::Default as NSUInteger) << MTLResourceHazardTrackingModeShift;
+        /// Only available on macos(10.13), ios(10.0)
+        const HazardTrackingModeUntracked = (MTLHazardTrackingMode::Untracked as NSUInteger) << MTLResourceHazardTrackingModeShift;
+        /// Only available on macos(10.15), ios(13.0)
+        const HazardTrackingModeTracked = (MTLHazardTrackingMode::Tracked as NSUInteger) << MTLResourceHazardTrackingModeShift;
+    }
+}
+
+bitflags! {
+    /// Options that describe how a graphics or compute function uses an argument buffer’s resource.
+    ///
+    /// Enabling certain options for certain resources determines whether the Metal driver should
+    /// convert the resource to another format (for example, whether to decompress a color render target).
+    pub struct MTLResourceUsage: NSUInteger {
+        /// An option that enables reading from the resource.
+        const Read   = 1 << 0;
+        /// An option that enables writing to the resource.
+        const Write  = 1 << 1;
+        /// An option that enables sampling from the resource.
+        ///
+        /// Specify this option only if the resource is a texture.
+        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] }
+    }
+
+    /// Only available on macos(10.15), ios(13.0)
+    pub fn hazard_tracking_mode(&self) -> MTLHazardTrackingMode {
+        unsafe { msg_send![self, hazardTrackingMode] }
+    }
+
+    /// Only available on macos(10.15), ios(13.0)
+    pub fn resource_options(&self) -> MTLResourceOptions {
+        unsafe { msg_send![self, resourceOptions] }
+    }
+
+    /// Only available on macos(10.13), ios(10.0)
+    pub fn heap(&self) -> &HeapRef {
+        unsafe { msg_send![self, heap] }
+    }
+
+    /// Only available on macos(10.15), ios(13.0)
+    pub fn heap_offset(&self) -> NSUInteger {
+        unsafe { msg_send![self, heapOffset] }
+    }
+
+    /// Only available on macos(10.13), ios(10.0)
+    pub fn make_aliasable(&self) {
+        unsafe { msg_send![self, makeAliasable] }
+    }
+
+    /// Only available on macos(10.13), ios(10.0)
+    pub fn is_aliasable(&self) -> bool {
+        unsafe {
+            match msg_send![self, isAliasable] {
+                YES => true,
+                NO => false,
+                _ => unreachable!(),
+            }
+        }
+    }
+}