1 files changed, 115 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..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] }
+    }
+}