// 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_D3D12_TEXTURED3D12_H_
#define SRC_DAWN_NATIVE_D3D12_TEXTURED3D12_H_

#include <optional>
#include <vector>

#include "dawn/native/Error.h"
#include "dawn/native/Texture.h"

#include "dawn/native/DawnNative.h"
#include "dawn/native/IntegerTypes.h"
#include "dawn/native/PassResourceUsage.h"
#include "dawn/native/d3d12/FenceD3D12.h"
#include "dawn/native/d3d12/IntegerTypes.h"
#include "dawn/native/d3d12/ResourceHeapAllocationD3D12.h"
#include "dawn/native/d3d12/d3d12_platform.h"

namespace dawn::native::d3d12 {

class CommandRecordingContext;
class Device;
class D3D11on12ResourceCacheEntry;

DXGI_FORMAT D3D12TextureFormat(wgpu::TextureFormat format);
MaybeError ValidateD3D12TextureCanBeWrapped(ID3D12Resource* d3d12Resource,
                                            const TextureDescriptor* descriptor);
MaybeError ValidateTextureDescriptorCanBeWrapped(const TextureDescriptor* descriptor);
MaybeError ValidateD3D12VideoTextureCanBeShared(Device* device, DXGI_FORMAT textureFormat);

class Texture final : public TextureBase {
  public:
    static ResultOrError<Ref<Texture>> Create(Device* device, const TextureDescriptor* descriptor);
    static ResultOrError<Ref<Texture>> CreateExternalImage(
        Device* device,
        const TextureDescriptor* descriptor,
        ComPtr<ID3D12Resource> d3d12Texture,
        std::vector<Ref<Fence>> waitFences,
        Ref<D3D11on12ResourceCacheEntry> d3d11on12Resource,
        bool isSwapChainTexture,
        bool isInitialized);
    static ResultOrError<Ref<Texture>> Create(Device* device,
                                              const TextureDescriptor* descriptor,
                                              ComPtr<ID3D12Resource> d3d12Texture);

    // For external textures, returns the Device internal fence's value associated with the last
    // ExecuteCommandLists that used this texture. If nullopt is returned, the texture wasn't used
    // or keyed mutex is used instead of fences for synchronization.
    ResultOrError<ExecutionSerial> EndAccess();

    DXGI_FORMAT GetD3D12Format() const;
    ID3D12Resource* GetD3D12Resource() const;
    DXGI_FORMAT GetD3D12CopyableSubresourceFormat(Aspect aspect) const;
    D3D12_RESOURCE_FLAGS GetD3D12ResourceFlags() const;

    D3D12_RENDER_TARGET_VIEW_DESC GetRTVDescriptor(const Format& format,
                                                   uint32_t mipLevel,
                                                   uint32_t baseSlice,
                                                   uint32_t sliceCount) const;
    D3D12_DEPTH_STENCIL_VIEW_DESC GetDSVDescriptor(uint32_t mipLevel,
                                                   uint32_t baseArrayLayer,
                                                   uint32_t layerCount,
                                                   Aspect aspects,
                                                   bool depthReadOnly,
                                                   bool stencilReadOnly) const;

    void EnsureSubresourceContentInitialized(CommandRecordingContext* commandContext,
                                             const SubresourceRange& range);

    MaybeError SynchronizeImportedTextureBeforeUse();
    MaybeError SynchronizeImportedTextureAfterUse();

    void TrackUsageAndGetResourceBarrierForPass(CommandRecordingContext* commandContext,
                                                std::vector<D3D12_RESOURCE_BARRIER>* barrier,
                                                const TextureSubresourceUsage& textureUsages);
    void TransitionUsageAndGetResourceBarrier(CommandRecordingContext* commandContext,
                                              std::vector<D3D12_RESOURCE_BARRIER>* barrier,
                                              wgpu::TextureUsage usage,
                                              const SubresourceRange& range);
    void TrackUsageAndTransitionNow(CommandRecordingContext* commandContext,
                                    wgpu::TextureUsage usage,
                                    const SubresourceRange& range);
    void TrackUsageAndTransitionNow(CommandRecordingContext* commandContext,
                                    D3D12_RESOURCE_STATES newState,
                                    const SubresourceRange& range);
    void TrackAllUsageAndTransitionNow(CommandRecordingContext* commandContext,
                                       wgpu::TextureUsage usage);
    void TrackAllUsageAndTransitionNow(CommandRecordingContext* commandContext,
                                       D3D12_RESOURCE_STATES newState);

  private:
    Texture(Device* device, const TextureDescriptor* descriptor, TextureState state);
    ~Texture() override;
    using TextureBase::TextureBase;

    MaybeError InitializeAsInternalTexture();
    MaybeError InitializeAsExternalTexture(ComPtr<ID3D12Resource> d3d12Texture,
                                           std::vector<Ref<Fence>> waitFences,
                                           Ref<D3D11on12ResourceCacheEntry> d3d11on12Resource,
                                           bool isSwapChainTexture);
    MaybeError InitializeAsSwapChainTexture(ComPtr<ID3D12Resource> d3d12Texture);

    void SetLabelHelper(const char* prefix);

    // Dawn API
    void SetLabelImpl() override;
    void DestroyImpl() override;

    MaybeError ClearTexture(CommandRecordingContext* commandContext,
                            const SubresourceRange& range,
                            TextureBase::ClearValue clearValue);

    // Barriers implementation details.
    struct StateAndDecay {
        D3D12_RESOURCE_STATES lastState;
        ExecutionSerial lastDecaySerial;
        bool isValidToDecay;

        bool operator==(const StateAndDecay& other) const;
    };
    void TransitionUsageAndGetResourceBarrier(CommandRecordingContext* commandContext,
                                              std::vector<D3D12_RESOURCE_BARRIER>* barrier,
                                              D3D12_RESOURCE_STATES newState,
                                              const SubresourceRange& range);
    void TransitionSubresourceRange(std::vector<D3D12_RESOURCE_BARRIER>* barriers,
                                    const SubresourceRange& range,
                                    StateAndDecay* state,
                                    D3D12_RESOURCE_STATES subresourceNewState,
                                    ExecutionSerial pendingCommandSerial) const;
    void HandleTransitionSpecialCases(CommandRecordingContext* commandContext);

    D3D12_RESOURCE_FLAGS mD3D12ResourceFlags;
    ResourceHeapAllocation mResourceAllocation;

    // TODO(dawn:1460): Encapsulate imported image fields e.g. std::unique_ptr<ExternalImportInfo>.
    std::vector<Ref<Fence>> mWaitFences;
    std::optional<ExecutionSerial> mSignalFenceValue;
    Ref<D3D11on12ResourceCacheEntry> mD3D11on12Resource;
    bool mSwapChainTexture = false;

    SubresourceStorage<StateAndDecay> mSubresourceStateAndDecay;
};

class TextureView final : public TextureViewBase {
  public:
    static Ref<TextureView> Create(TextureBase* texture, const TextureViewDescriptor* descriptor);

    DXGI_FORMAT GetD3D12Format() const;

    const D3D12_SHADER_RESOURCE_VIEW_DESC& GetSRVDescriptor() const;
    D3D12_RENDER_TARGET_VIEW_DESC GetRTVDescriptor() const;
    D3D12_DEPTH_STENCIL_VIEW_DESC GetDSVDescriptor(bool depthReadOnly, bool stencilReadOnly) const;
    D3D12_UNORDERED_ACCESS_VIEW_DESC GetUAVDescriptor() const;

  private:
    TextureView(TextureBase* texture, const TextureViewDescriptor* descriptor);

    D3D12_SHADER_RESOURCE_VIEW_DESC mSrvDesc;
};
}  // namespace dawn::native::d3d12

#endif  // SRC_DAWN_NATIVE_D3D12_TEXTURED3D12_H_