// Copyright 2024 The Dawn & Tint Authors
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#ifndef SRC_DAWN_NATIVE_METAL_MULTIDRAWENCODER_H_
#define SRC_DAWN_NATIVE_METAL_MULTIDRAWENCODER_H_

#import <Metal/Metal.h>

#include <vector>

#include "src/dawn/native/Commands.h"
#include "src/dawn/native/IndirectDrawMetadata.h"
#include "src/dawn/native/InternalPipelineStore.h"
#include "src/dawn/native/metal/DeviceMTL.h"
#include "src/utils/non_copyable.h"

namespace dawn::native::metal {

// This is a class that encloses the pipeline and argument encoder for the multi-draw converter
// compute pass. It acts as a cache for the pipeline and the argument encoder, so that they are
// reused for multiple multi-draws in PrepareMultiDraws. This class lives in InternalPipelineStore.
class MultiDrawConverterPipeline : public RefCounted {
  public:
    static ResultOrError<Ref<MultiDrawConverterPipeline>> Create(DeviceBase* device);

    id<MTLComputePipelineState> GetMTLPipeline() const;

    id<MTLArgumentEncoder> GetMTLArgumentEncoder() const;

  private:
    MaybeError Initialize(DeviceBase* device);

    MultiDrawConverterPipeline() = default;
    ~MultiDrawConverterPipeline() override = default;

    NSPRef<id<MTLComputePipelineState>> mPipeline;
    NSPRef<id<MTLArgumentEncoder>> mArgumentEncoder;
};

struct MultiDrawExecutionData {
    NSPRef<id<MTLIndirectCommandBuffer>> mIndirectCommandBuffer;
    uint32_t mMaxDrawCount;
};

ResultOrError<std::vector<MultiDrawExecutionData>> PrepareMultiDraws(
    DeviceBase* device,
    id<MTLComputeCommandEncoder> encoder,
    const std::vector<IndirectDrawMetadata::IndirectMultiDraw>& multiDraws);

void ExecuteMultiDraw(const MultiDrawExecutionData& data, id<MTLRenderCommandEncoder> encoder);

}  // namespace dawn::native::metal
#endif  // SRC_DAWN_NATIVE_METAL_MULTIDRAWENCODER_H_
