src/dawn/native/d3d12/ResourceTableD3D12.h

// Copyright 2026 The Dawn & Tint Authors
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#ifndef SRC_DAWN_NATIVE_D3D12_RESOURCETABLED3D12_H_
#define SRC_DAWN_NATIVE_D3D12_RESOURCETABLED3D12_H_

#include <vector>

#include "dawn/common/MutexProtected.h"
#include "dawn/native/Error.h"
#include "dawn/native/ResourceTable.h"
#include "dawn/native/d3d12/CPUDescriptorHeapAllocationD3D12.h"
#include "dawn/native/d3d12/GPUDescriptorHeapAllocationD3D12.h"

namespace dawn::native::d3d12 {

class Device;
class CommandRecordingContext;
class ShaderVisibleDescriptorAllocator;
class PipelineLayout;

class ResourceTable final : public ResourceTableBase {
  public:
    // Returns descriptor ranges for metadata buffer and unbounded resource arrays. Used to add a
    // root descriptor table to the root signature.
    static std::vector<D3D12_DESCRIPTOR_RANGE1> GetCbvUavSrvDescriptorRanges(
        const PipelineLayout& layout);

    static ResultOrError<Ref<ResourceTable>> Create(Device* device,
                                                    const ResourceTableDescriptor* descriptor);

    // Apply updates to resources or to the metadata buffers that are pending.
    MaybeError ApplyPendingUpdates(CommandRecordingContext* recordingContext);

    // Returns true if the ResourceTable was successfully populated (now or on a previous call)
    // in the current allocator's heap. If false is returned, caller should
    // AllocateAndSwitchShaderVisibleHeap and populate again.
    bool PopulateViews(ShaderVisibleDescriptorAllocator* viewAllocator);

    // Returns a GPU heap handle handle to the base descriptor of the set of descriptors
    // that were copied there in PopulateViews. This should be set as a root descriptor table on the
    // command list to match the definition in the root signature.
    D3D12_GPU_DESCRIPTOR_HANDLE GetBaseViewDescriptor() const;

  protected:
    void DestroyImpl(DestroyReason reason) override;
    void SetLabelImpl() override;

  private:
    ~ResourceTable() override;

    using ResourceTableBase::ResourceTableBase;
    MaybeError Initialize();
    MaybeError AllocateCPUHeap(D3D12_DESCRIPTOR_HEAP_TYPE heapType, uint32_t descriptorCount);
    void FreeCPUHeap();
    MaybeError UpdateMetadataBuffer(CommandRecordingContext* recordingContext,
                                    const std::vector<MetadataUpdate>& updates);
    MaybeError UpdateResourceBindings(const std::vector<ResourceUpdate>& updates);

    ComPtr<ID3D12DescriptorHeap> mCPUHeap;
    CPUDescriptorHeapAllocation mCPUViewAllocation;
    GPUDescriptorHeapAllocation mGPUViewAllocation;
    uint32_t mViewSizeIncrement = 0;
};

}  // namespace dawn::native::d3d12

#endif  // SRC_DAWN_NATIVE_D3D12_RESOURCETABLED3D12_H_