// Copyright 2020 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_INTERNALPIPELINESTORE_H_
#define SRC_DAWN_NATIVE_INTERNALPIPELINESTORE_H_

#include <unordered_map>
#include <utility>

#include "dawn/common/HashUtils.h"
#include "dawn/native/ApplyClearColorValueWithDrawHelper.h"
#include "dawn/native/BlitColorToColorWithDraw.h"
#include "dawn/native/ObjectBase.h"
#include "dawn/native/ScratchBuffer.h"
#include "dawn/native/dawn_platform.h"

namespace dawn::native {

class DeviceBase;
class RenderPipelineBase;
class ShaderModuleBase;

// Every DeviceBase owns an InternalPipelineStore. This is a general-purpose cache for
// long-lived objects scoped to a device and used to support arbitrary pipeline operations.
struct InternalPipelineStore {
    explicit InternalPipelineStore(DeviceBase* device);
    ~InternalPipelineStore();

    std::unordered_map<wgpu::TextureFormat, Ref<RenderPipelineBase>> copyTextureForBrowserPipelines;
    std::unordered_map<wgpu::TextureFormat, Ref<RenderPipelineBase>>
        copyExternalTextureForBrowserPipelines;

    Ref<ShaderModuleBase> copyForBrowser;

    Ref<ComputePipelineBase> timestampComputePipeline;
    Ref<ShaderModuleBase> timestampCS;

    ApplyClearColorValueWithDrawPipelinesCache applyClearColorValueWithDrawPipelines;

    Ref<ShaderModuleBase> placeholderFragmentShader;

    // A scratch buffer suitable for use as a copy destination and storage binding.
    ScratchBuffer scratchStorage;

    // A scratch buffer suitable for use as a copy destination, storage binding, and indirect
    // buffer for indirect dispatch or draw calls.
    ScratchBuffer scratchIndirectStorage;

    Ref<ComputePipelineBase> renderValidationPipeline;
    Ref<ShaderModuleBase> renderValidationShader;
    Ref<ComputePipelineBase> dispatchIndirectValidationPipeline;

    Ref<RenderPipelineBase> blitRG8ToDepth16UnormPipeline;

    using BlitTextureToBufferComputePipelineKeyType =
        std::pair<wgpu::TextureFormat, wgpu::TextureDimension>;
    struct BlitTextureToBufferComputePipelineHash {
        std::size_t operator()(const BlitTextureToBufferComputePipelineKeyType& k) const {
            size_t hash = 0;
            HashCombine(&hash, k.first);
            HashCombine(&hash, k.second);
            return hash;
        }
    };
    std::unordered_map<BlitTextureToBufferComputePipelineKeyType,
                       Ref<ComputePipelineBase>,
                       BlitTextureToBufferComputePipelineHash>
        blitTextureToBufferComputePipelines;

    struct BlitR8ToStencilPipelines {
        Ref<RenderPipelineBase> clearPipeline;
        std::array<Ref<RenderPipelineBase>, 8> setStencilPipelines;
    };
    std::unordered_map<wgpu::TextureFormat, BlitR8ToStencilPipelines> blitR8ToStencilPipelines;

    std::unordered_map<wgpu::TextureFormat, Ref<RenderPipelineBase>> depthBlitPipelines;

    BlitColorToColorWithDrawPipelinesCache msaaRenderToSingleSampledColorBlitPipelines;
};

}  // namespace dawn::native

#endif  // SRC_DAWN_NATIVE_INTERNALPIPELINESTORE_H_