src/dawn/native/ApplyClearColorValueWithDrawHelper.h

// Copyright 2022 The Dawn & Tint Authors
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#ifndef SRC_DAWN_NATIVE_APPLYCLEARVALUEWITHDRAWHELPER_H_
#define SRC_DAWN_NATIVE_APPLYCLEARVALUEWITHDRAWHELPER_H_

#include "absl/container/flat_hash_map.h"
#include "dawn/common/Ref.h"
#include "dawn/common/ityp_array.h"
#include "dawn/common/ityp_bitset.h"
#include "dawn/native/Error.h"
#include "dawn/native/IntegerTypes.h"

namespace dawn::native {
class BufferBase;
class CommandEncoder;
class RenderPassEncoder;
struct RenderPassDescriptor;

struct KeyOfApplyClearColorValueWithDrawPipelines {
    uint8_t colorAttachmentCount = 0;
    PerColorAttachment<wgpu::TextureFormat> colorTargetFormats;
    ColorAttachmentMask colorTargetsToApplyClearColorValue;
    uint32_t sampleCount = 0;
    wgpu::TextureFormat depthStencilFormat = wgpu::TextureFormat::Undefined;
};

struct KeyOfApplyClearColorValueWithDrawPipelinesHashFunc {
    size_t operator()(KeyOfApplyClearColorValueWithDrawPipelines key) const;
};
struct KeyOfApplyClearColorValueWithDrawPipelinesEqualityFunc {
    bool operator()(KeyOfApplyClearColorValueWithDrawPipelines key1,
                    const KeyOfApplyClearColorValueWithDrawPipelines key2) const;
};
using ApplyClearColorValueWithDrawPipelinesCache =
    absl::flat_hash_map<KeyOfApplyClearColorValueWithDrawPipelines,
                        Ref<RenderPipelineBase>,
                        KeyOfApplyClearColorValueWithDrawPipelinesHashFunc,
                        KeyOfApplyClearColorValueWithDrawPipelinesEqualityFunc>;

class ClearWithDrawHelper {
  public:
    ClearWithDrawHelper();
    ~ClearWithDrawHelper();

    MaybeError Initialize(CommandEncoder* encoder,
                          const RenderPassDescriptor* renderPassDescriptor);
    MaybeError Apply(RenderPassEncoder* renderPassEncoder);

  private:
    bool mShouldRun = false;
    KeyOfApplyClearColorValueWithDrawPipelines mKey;
    Ref<BufferBase> mUniformBufferWithClearColorValues;
};

}  // namespace dawn::native

#endif