// 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 DAWNNATIVE_TEXTURE_H_
#define DAWNNATIVE_TEXTURE_H_

#include "dawn_native/Error.h"
#include "dawn_native/Forward.h"
#include "dawn_native/ObjectBase.h"

#include "dawn_native/dawn_platform.h"

#include <vector>

namespace dawn_native {
    MaybeError ValidateTextureDescriptor(const DeviceBase* device,
                                         const TextureDescriptor* descriptor);
    MaybeError ValidateTextureViewDescriptor(const TextureBase* texture,
                                             const TextureViewDescriptor* descriptor);
    TextureViewDescriptor GetTextureViewDescriptorWithDefaults(
        const TextureBase* texture,
        const TextureViewDescriptor* descriptor);

    // TODO(dawn:22): Remove once migration from GPUTextureDescriptor.arrayLayerCount to
    // GPUTextureDescriptor.size.depth is done.
    ResultOrError<TextureDescriptor> FixTextureDescriptor(DeviceBase* device,
                                                          const TextureDescriptor* desc);

    bool IsValidSampleCount(uint32_t sampleCount);

    static constexpr wgpu::TextureUsage kReadOnlyTextureUsages =
        wgpu::TextureUsage::CopySrc | wgpu::TextureUsage::Sampled | kReadonlyStorageTexture;

    static constexpr wgpu::TextureUsage kWritableTextureUsages =
        wgpu::TextureUsage::CopyDst | wgpu::TextureUsage::Storage |
        wgpu::TextureUsage::OutputAttachment;

    struct SubresourceRange {
        uint32_t baseMipLevel;
        uint32_t levelCount;
        uint32_t baseArrayLayer;
        uint32_t layerCount;

        static SubresourceRange SingleSubresource(uint32_t baseMipLevel, uint32_t baseArrayLayer);
    };

    class TextureBase : public ObjectBase {
      public:
        enum class TextureState { OwnedInternal, OwnedExternal, Destroyed };
        enum class ClearValue { Zero, NonZero };
        TextureBase(DeviceBase* device, const TextureDescriptor* descriptor, TextureState state);

        static TextureBase* MakeError(DeviceBase* device);

        wgpu::TextureDimension GetDimension() const;
        const Format& GetFormat() const;
        const Extent3D& GetSize() const;
        uint32_t GetArrayLayers() const;
        uint32_t GetNumMipLevels() const;
        SubresourceRange GetAllSubresources() const;
        uint32_t GetSampleCount() const;
        uint32_t GetSubresourceCount() const;
        wgpu::TextureUsage GetUsage() const;
        TextureState GetTextureState() const;
        uint32_t GetSubresourceIndex(uint32_t mipLevel, uint32_t arraySlice) const;
        bool IsSubresourceContentInitialized(const SubresourceRange& range) const;
        void SetIsSubresourceContentInitialized(bool isInitialized, const SubresourceRange& range);

        MaybeError ValidateCanUseInSubmitNow() const;

        bool IsMultisampledTexture() const;

        // For a texture with non-block-compressed texture format, its physical size is always equal
        // to its virtual size. For a texture with block compressed texture format, the physical
        // size is the one with paddings if necessary, which is always a multiple of the block size
        // and used in texture copying. The virtual size is the one without paddings, which is not
        // required to be a multiple of the block size and used in texture sampling.
        Extent3D GetMipLevelPhysicalSize(uint32_t level) const;
        Extent3D GetMipLevelVirtualSize(uint32_t level) const;

        // Dawn API
        TextureViewBase* CreateView(const TextureViewDescriptor* descriptor);
        void Destroy();

      protected:
        void DestroyInternal();

      private:
        TextureBase(DeviceBase* device, ObjectBase::ErrorTag tag);
        virtual void DestroyImpl();

        MaybeError ValidateDestroy() const;
        wgpu::TextureDimension mDimension;
        // TODO(cwallez@chromium.org): This should be deduplicated in the Device
        const Format& mFormat;
        Extent3D mSize;
        uint32_t mArrayLayerCount;
        uint32_t mMipLevelCount;
        uint32_t mSampleCount;
        wgpu::TextureUsage mUsage = wgpu::TextureUsage::None;
        TextureState mState;

        // TODO(natlee@microsoft.com): Use a more optimized data structure to save space
        std::vector<bool> mIsSubresourceContentInitializedAtIndex;
    };

    class TextureViewBase : public ObjectBase {
      public:
        TextureViewBase(TextureBase* texture, const TextureViewDescriptor* descriptor);

        static TextureViewBase* MakeError(DeviceBase* device);

        const TextureBase* GetTexture() const;
        TextureBase* GetTexture();

        const Format& GetFormat() const;
        wgpu::TextureViewDimension GetDimension() const;
        uint32_t GetBaseMipLevel() const;
        uint32_t GetLevelCount() const;
        uint32_t GetBaseArrayLayer() const;
        uint32_t GetLayerCount() const;
        const SubresourceRange& GetSubresourceRange() const;

      private:
        TextureViewBase(DeviceBase* device, ObjectBase::ErrorTag tag);

        Ref<TextureBase> mTexture;

        // TODO(cwallez@chromium.org): This should be deduplicated in the Device
        const Format& mFormat;
        wgpu::TextureViewDimension mDimension;
        SubresourceRange mRange;
    };

}  // namespace dawn_native

#endif  // DAWNNATIVE_TEXTURE_H_