src/dawn/native/vulkan/ComputePipelineVk.h

// Copyright 2018 The Dawn & Tint Authors
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#ifndef SRC_DAWN_NATIVE_VULKAN_COMPUTEPIPELINEVK_H_
#define SRC_DAWN_NATIVE_VULKAN_COMPUTEPIPELINEVK_H_

#include "dawn/common/vulkan_platform.h"
#include "dawn/native/ComputePipeline.h"
#include "dawn/native/CreatePipelineAsyncEvent.h"
#include "dawn/native/Error.h"
#include "dawn/native/vulkan/PipelineLayoutVk.h"
#include "dawn/native/vulkan/PipelineVk.h"
#include "dawn/native/vulkan/RefCountedVkHandle.h"

namespace dawn::native::vulkan {

class Device;
struct VkPipelineLayoutObject;

class ComputePipeline final : public ComputePipelineBase {
  public:
    static Ref<ComputePipeline> CreateUninitialized(
        Device* device,
        const UnpackedPtr<ComputePipelineDescriptor>& descriptor);

    VkPipeline GetHandle() const;
    VkPipelineLayout GetVkLayout() const;

    // Specializations used to JIT pipelines.
    using Specialization = CommonPipelineSpecialization;
    ResultOrError<PipelineHandles> GetOrCreateSpecializedHandle(Specialization&& specialization);
    bool RequiresSpecialization() const;

    void ApplyDynamicState(VkCommandBuffer& commands, const ComputePipeline* prevPipeline) const {}

    // Dawn API
    void SetLabelImpl() override;

  private:
    ~ComputePipeline() override;
    void DestroyImpl(DestroyReason reason) override;
    using ComputePipelineBase::ComputePipelineBase;
    ResultOrError<Extent3D> InitializeImpl() override;

    // Initializes a pipeline for the specialization and stores it in mSpecializations.
    struct SpecializationResult {
        Extent3D workgroupSize;
        Ref<RefCountedVkHandle<VkPipeline>> pipeline;
        Ref<RefCountedVkHandle<VkPipelineLayout>> layout;
    };
    ResultOrError<SpecializationResult> InitializeSpecialization(
        const Specialization& specialization,
        bool buildCacheKey);

    // The handles are owned by a ref in mSpecializations.
    PipelineHandles mHandles = {};

    // Caches the specializations as we are most likely to reuse the overtime. Note that noop
    // specialization has mHandle cached directly but mHandle is also kept separately for
    // efficiency.
    bool mRequiresSpecialization = false;
    absl::flat_hash_map<Specialization, SpecializationResult> mSpecializations;
};

}  // namespace dawn::native::vulkan

#endif  // SRC_DAWN_NATIVE_VULKAN_COMPUTEPIPELINEVK_H_