Add support for creating a GrContext backed by Metal.

Also adds the support code to allow our TestContext to create a Metal
backend.

Bug: skia:
Change-Id: Ia850687019d79b897bb16e2c151f4f8526721ad9
Reviewed-on: https://skia-review.googlesource.com/22644
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>

1 files changed, 26 insertions, 3 deletions

diff --git a/src/gpu/mtl/GrMtlGpu.mm b/src/gpu/mtl/GrMtlGpu.mm
index 7d9339cf29..986bb8a6f7 100644
--- a/src/gpu/mtl/GrMtlGpu.mm
+++ b/src/gpu/mtl/GrMtlGpu.mm
@@ -11,8 +11,31 @@
 #error This file must be compiled with Arc. Use -fobjc-arc flag
 #endif
 
-GrGpu* GrMtlGpu::Create(GrBackendContext backendContext, const GrContextOptions& options,
-                        GrContext* context) {
-    return nullptr;
+GrGpu* GrMtlGpu::Create(GrContext* context, const GrContextOptions& options,
+                        id<MTLDevice> device, id<MTLCommandQueue> queue) {
+    if (!device || !queue) {
+        return nullptr;
+    }
+    return new GrMtlGpu(context, options, device, queue);
 }
 
+GrMtlGpu::GrMtlGpu(GrContext* context, const GrContextOptions& options,
+                   id<MTLDevice> device, id<MTLCommandQueue> queue)
+        : INHERITED(context)
+        , fDevice(device)
+        , fQueue(queue) {
+    MTLTextureDescriptor* txDesc = [[MTLTextureDescriptor alloc] init];
+    txDesc.textureType = MTLTextureType3D;
+    txDesc.height = 64;
+    txDesc.width = 64;
+    txDesc.depth = 64;
+    txDesc.pixelFormat = MTLPixelFormatRGBA8Unorm;
+    txDesc.arrayLength = 1;
+    txDesc.mipmapLevelCount = 1;
+    id<MTLTexture> testTexture = [fDevice newTextureWithDescriptor:txDesc];
+    // To get ride of unused var warning
+    int width = [testTexture width];
+    SkDebugf("width: %d\n", width);
+    // Unused queue warning fix
+    SkDebugf("ptr to queue: %p\n", fQueue);
+}