// 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"

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

    uint32_t TextureFormatPixelSize(dawn::TextureFormat format);
    bool TextureFormatHasDepth(dawn::TextureFormat format);
    bool TextureFormatHasStencil(dawn::TextureFormat format);
    bool TextureFormatHasDepthOrStencil(dawn::TextureFormat format);
    bool IsColorRenderableTextureFormat(dawn::TextureFormat format);
    bool IsDepthStencilRenderableTextureFormat(dawn::TextureFormat format);
    bool IsValidSampleCount(uint32_t sampleCount);

    static constexpr dawn::TextureUsageBit kReadOnlyTextureUsages =
        dawn::TextureUsageBit::TransferSrc | dawn::TextureUsageBit::Sampled |
        dawn::TextureUsageBit::Present;

    static constexpr dawn::TextureUsageBit kWritableTextureUsages =
        dawn::TextureUsageBit::TransferDst | dawn::TextureUsageBit::Storage |
        dawn::TextureUsageBit::OutputAttachment;

    class TextureBase : public ObjectBase {
      public:
        enum class TextureState { OwnedInternal, OwnedExternal, Destroyed };

        TextureBase(DeviceBase* device, const TextureDescriptor* descriptor, TextureState state);

        static TextureBase* MakeError(DeviceBase* device);

        dawn::TextureDimension GetDimension() const;
        dawn::TextureFormat GetFormat() const;
        const Extent3D& GetSize() const;
        uint32_t GetArrayLayers() const;
        uint32_t GetNumMipLevels() const;
        uint32_t GetSampleCount() const;
        dawn::TextureUsageBit GetUsage() const;
        TextureState GetTextureState() const;

        MaybeError ValidateCanUseInSubmitNow() const;

        bool IsMultisampledTexture() const;

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

      protected:
        void DestroyInternal();

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

        MaybeError ValidateDestroy() const;
        dawn::TextureDimension mDimension;
        dawn::TextureFormat mFormat;
        Extent3D mSize;
        uint32_t mArrayLayerCount;
        uint32_t mMipLevelCount;
        uint32_t mSampleCount;
        dawn::TextureUsageBit mUsage = dawn::TextureUsageBit::None;
        TextureState mState;
    };

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

        static TextureViewBase* MakeError(DeviceBase* device);

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

        dawn::TextureFormat GetFormat() const;
        uint32_t GetBaseMipLevel() const;
        uint32_t GetLevelCount() const;
        uint32_t GetBaseArrayLayer() const;
        uint32_t GetLayerCount() const;

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

        Ref<TextureBase> mTexture;

        dawn::TextureFormat mFormat;
        uint32_t mBaseMipLevel;
        uint32_t mMipLevelCount;
        uint32_t mBaseArrayLayer;
        uint32_t mArrayLayerCount;
    };

}  // namespace dawn_native

#endif  // DAWNNATIVE_TEXTURE_H_