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, 8 insertions, 16 deletions

diff --git a/src/gpu/mtl/GrMtlGpu.h b/src/gpu/mtl/GrMtlGpu.h
index 7ec9907675..b63f9080be 100644
--- a/src/gpu/mtl/GrMtlGpu.h
+++ b/src/gpu/mtl/GrMtlGpu.h
@@ -16,11 +16,12 @@
 #import <Metal/Metal.h>
 
 class GrSemaphore;
+struct GrMtlBackendContext;
 
 class GrMtlGpu : public GrGpu {
 public:
-    static GrGpu* Create(GrBackendContext backendContext, const GrContextOptions& options,
-                         GrContext* context);
+    static GrGpu* Create(GrContext* context, const GrContextOptions& options,
+                         id<MTLDevice> device, id<MTLCommandQueue> queue);
 
     ~GrMtlGpu() override {}
 
@@ -59,19 +60,8 @@ public:
     sk_sp<GrSemaphore> prepareTextureForCrossContextUsage(GrTexture*) override { return nullptr; }
 
 private:
-    GrMtlGpu(GrContext* context, const GrContextOptions& options) : INHERITED(context) {
-        id<MTLDevice> device = MTLCreateSystemDefaultDevice();
-
-        MTLTextureDescriptor* txDesc = [[MTLTextureDescriptor alloc] init];
-        txDesc.textureType = MTLTextureType3D;
-        txDesc.height = 64;
-        txDesc.width = 64;
-        txDesc.depth = 64;
-        txDesc.pixelFormat = MTLPixelFormatBGRA8Unorm;
-        txDesc.arrayLength = 1;
-        txDesc.mipmapLevelCount = 1;
-        fTestHeaderTexture = [device newTextureWithDescriptor:txDesc];
-    }
+    GrMtlGpu(GrContext* context, const GrContextOptions& options,
+             id<MTLDevice> device, id<MTLCommandQueue> queue);
 
     void onResetContext(uint32_t resetBits) override {}
 
@@ -146,7 +136,9 @@ private:
     bool isTestingOnlyBackendTexture(GrBackendObject ) const override { return false; }
     void deleteTestingOnlyBackendTexture(GrBackendObject, bool abandonTexture) override {}
 
-    id<MTLTexture> fTestHeaderTexture;
+    id<MTLDevice> fDevice;
+    id<MTLCommandQueue> fQueue;
+
 
     typedef GrGpu INHERITED;
 };