text: // Copyright 2017 The Dawn Authors
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //     http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  #ifndef SRC_DAWN_NATIVE_METAL_RENDERPIPELINEMTL_H_
  #define SRC_DAWN_NATIVE_METAL_RENDERPIPELINEMTL_H_
  
  #include "dawn/native/RenderPipeline.h"
  
  #include "dawn/common/NSRef.h"
  
  #import <Metal/Metal.h>
  
  namespace dawn::native::metal {
  
  class Device;
  
  class RenderPipeline final : public RenderPipelineBase {
    public:
      static Ref<RenderPipelineBase> CreateUninitialized(Device* device,
                                                         const RenderPipelineDescriptor* descriptor);
      static void InitializeAsync(Ref<RenderPipelineBase> renderPipeline,
                                  WGPUCreateRenderPipelineAsyncCallback callback,
                                  void* userdata);
  
      MTLPrimitiveType GetMTLPrimitiveTopology() const;
      MTLWinding GetMTLFrontFace() const;
      MTLCullMode GetMTLCullMode() const;
  
      void Encode(id<MTLRenderCommandEncoder> encoder);
  
      id<MTLDepthStencilState> GetMTLDepthStencilState();
  
      // For each Dawn vertex buffer, give the index in which it will be positioned in the Metal
      // vertex buffer table.
      uint32_t GetMtlVertexBufferIndex(VertexBufferSlot slot) const;
  
      wgpu::ShaderStage GetStagesRequiringStorageBufferLength() const;
  
      MaybeError Initialize() override;
  
    private:
      using RenderPipelineBase::RenderPipelineBase;
  
      NSRef<MTLVertexDescriptor> MakeVertexDesc();
  
      MTLPrimitiveType mMtlPrimitiveTopology;
      MTLWinding mMtlFrontFace;
      MTLCullMode mMtlCullMode;
      NSPRef<id<MTLRenderPipelineState>> mMtlRenderPipelineState;
      NSPRef<id<MTLDepthStencilState>> mMtlDepthStencilState;
      ityp::array<VertexBufferSlot, uint32_t, kMaxVertexBuffers> mMtlVertexBufferIndices;
  
      wgpu::ShaderStage mStagesRequiringStorageBufferLength = wgpu::ShaderStage::None;
  };
  
  }  // namespace dawn::native::metal
  
  #endif  // SRC_DAWN_NATIVE_METAL_RENDERPIPELINEMTL_H_
  