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Wire up the Skia Metal backend on iOS. (flutter#8936)
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| Original file line number | Diff line number | Diff line change |
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@@ -4,4 +4,5 @@ | |
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| declare_args() { | ||
| shell_enable_vulkan = false | ||
| shell_enable_metal = false | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,50 @@ | ||
| // Copyright 2013 The Flutter Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style license that can be | ||
| // found in the LICENSE file. | ||
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| #ifndef FLUTTER_SHELL_GPU_GPU_SURFACE_METAL_H_ | ||
| #define FLUTTER_SHELL_GPU_GPU_SURFACE_METAL_H_ | ||
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| #include <Metal/Metal.h> | ||
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| #include "flutter/fml/macros.h" | ||
| #include "flutter/fml/platform/darwin/scoped_nsobject.h" | ||
| #include "flutter/shell/common/surface.h" | ||
| #include "third_party/skia/include/gpu/GrContext.h" | ||
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| @class CAMetalLayer; | ||
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| namespace flutter { | ||
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| class GPUSurfaceMetal : public Surface { | ||
| public: | ||
| GPUSurfaceMetal(fml::scoped_nsobject<CAMetalLayer> layer); | ||
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| ~GPUSurfaceMetal() override; | ||
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| private: | ||
| fml::scoped_nsobject<CAMetalLayer> layer_; | ||
| sk_sp<GrContext> context_; | ||
| fml::scoped_nsprotocol<id<MTLCommandQueue>> command_queue_; | ||
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| // |Surface| | ||
| bool IsValid() override; | ||
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| // |Surface| | ||
| std::unique_ptr<SurfaceFrame> AcquireFrame(const SkISize& size) override; | ||
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| // |Surface| | ||
| SkMatrix GetRootTransformation() const override; | ||
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| // |Surface| | ||
| GrContext* GetContext() override; | ||
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| // |Surface| | ||
| bool MakeRenderContextCurrent() override; | ||
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| FML_DISALLOW_COPY_AND_ASSIGN(GPUSurfaceMetal); | ||
| }; | ||
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| } // namespace flutter | ||
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| #endif // FLUTTER_SHELL_GPU_GPU_SURFACE_METAL_H_ |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,145 @@ | ||
| // Copyright 2013 The Flutter Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style license that can be | ||
| // found in the LICENSE file. | ||
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| #include "flutter/shell/gpu/gpu_surface_metal.h" | ||
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| #include <QuartzCore/CAMetalLayer.h> | ||
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| #include "third_party/skia/include/core/SkSurface.h" | ||
| #include "third_party/skia/include/gpu/GrBackendSurface.h" | ||
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| namespace flutter { | ||
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| GPUSurfaceMetal::GPUSurfaceMetal(fml::scoped_nsobject<CAMetalLayer> layer) | ||
| : layer_(std::move(layer)) { | ||
| if (!layer_) { | ||
| FML_LOG(ERROR) << "Could not create metal surface because of invalid layer."; | ||
| return; | ||
| } | ||
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| layer.get().pixelFormat = MTLPixelFormatBGRA8Unorm; | ||
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| auto metal_device = fml::scoped_nsprotocol<id<MTLDevice>>([layer_.get().device retain]); | ||
| auto metal_queue = fml::scoped_nsprotocol<id<MTLCommandQueue>>([metal_device newCommandQueue]); | ||
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| if (!metal_device || !metal_queue) { | ||
| FML_LOG(ERROR) << "Could not create metal device or queue."; | ||
| return; | ||
| } | ||
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| command_queue_ = metal_queue; | ||
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| // The context creation routine accepts arguments using transfer semantics. | ||
| auto context = GrContext::MakeMetal(metal_device.release(), metal_queue.release()); | ||
| if (!context) { | ||
| FML_LOG(ERROR) << "Could not create Skia metal context."; | ||
| return; | ||
| } | ||
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| context_ = context; | ||
| } | ||
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| GPUSurfaceMetal::~GPUSurfaceMetal() = default; | ||
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| // |Surface| | ||
| bool GPUSurfaceMetal::IsValid() { | ||
| return layer_ && context_ && command_queue_; | ||
| } | ||
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| // |Surface| | ||
| std::unique_ptr<SurfaceFrame> GPUSurfaceMetal::AcquireFrame(const SkISize& size) { | ||
| if (!IsValid()) { | ||
| FML_LOG(ERROR) << "Metal surface was invalid."; | ||
| return nullptr; | ||
| } | ||
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| if (size.isEmpty()) { | ||
| FML_LOG(ERROR) << "Metal surface was asked for an empty frame."; | ||
| return nullptr; | ||
| } | ||
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| const auto bounds = layer_.get().bounds.size; | ||
| if (bounds.width <= 0.0 || bounds.height <= 0.0) { | ||
| FML_LOG(ERROR) << "Metal layer bounds were invalid."; | ||
| return nullptr; | ||
| } | ||
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| const auto scale = layer_.get().contentsScale; | ||
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| auto next_drawable = fml::scoped_nsprotocol<id<CAMetalDrawable>>([[layer_ nextDrawable] retain]); | ||
| if (!next_drawable) { | ||
| FML_LOG(ERROR) << "Could not acquire next metal drawable."; | ||
| return nullptr; | ||
| } | ||
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| auto metal_texture = fml::scoped_nsprotocol<id<MTLTexture>>([next_drawable.get().texture retain]); | ||
| if (!metal_texture) { | ||
| FML_LOG(ERROR) << "Could not acquire metal texture from drawable."; | ||
| return nullptr; | ||
| } | ||
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| GrMtlTextureInfo metal_texture_info; | ||
| metal_texture_info.fTexture = metal_texture.get(); | ||
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| GrBackendRenderTarget metal_render_target(bounds.width * scale, // width | ||
| bounds.height * scale, // height | ||
| 1, // sample count | ||
| metal_texture_info // metal texture info | ||
| ); | ||
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| auto command_buffer = | ||
| fml::scoped_nsprotocol<id<MTLCommandBuffer>>([[command_queue_.get() commandBuffer] retain]); | ||
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| SkSurface::RenderTargetReleaseProc release_proc = [](SkSurface::ReleaseContext context) { | ||
| [reinterpret_cast<id>(context) release]; | ||
| }; | ||
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| auto surface = | ||
| SkSurface::MakeFromBackendRenderTarget(context_.get(), // context | ||
| metal_render_target, // backend render target | ||
| kTopLeft_GrSurfaceOrigin, // origin | ||
| kBGRA_8888_SkColorType, // color type | ||
| nullptr, // colorspace | ||
| nullptr, // surface properties | ||
| release_proc, // release proc | ||
| metal_texture.release() // release context (texture) | ||
| ); | ||
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| if (!surface) { | ||
| FML_LOG(ERROR) << "Could not create the SkSurface from the metal texture."; | ||
| return nullptr; | ||
| } | ||
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| auto submit_callback = [drawable = next_drawable, command_buffer]( | ||
| const SurfaceFrame& surface_frame, SkCanvas* canvas) -> bool { | ||
| canvas->flush(); | ||
| [command_buffer.get() presentDrawable:drawable.get()]; | ||
| [command_buffer.get() commit]; | ||
| return true; | ||
| }; | ||
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| return std::make_unique<SurfaceFrame>(std::move(surface), submit_callback); | ||
| } | ||
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| // |Surface| | ||
| SkMatrix GPUSurfaceMetal::GetRootTransformation() const { | ||
| // This backend does not currently support root surface transformations. Just | ||
| // return identity. | ||
| SkMatrix matrix; | ||
| matrix.reset(); | ||
| return matrix; | ||
| } | ||
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| // |Surface| | ||
| GrContext* GPUSurfaceMetal::GetContext() { | ||
| return context_.get(); | ||
| } | ||
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| // |Surface| | ||
| bool GPUSurfaceMetal::MakeRenderContextCurrent() { | ||
| // This backend has no such concept. | ||
| return true; | ||
| } | ||
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| } // namespace flutter |
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