// Copyright 2017 The NXT 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 BACKEND_TEXTURE_H_
#define BACKEND_TEXTURE_H_

#include "backend/Builder.h"
#include "backend/Forward.h"
#include "backend/RefCounted.h"

#include "nxt/nxtcpp.h"

namespace backend {

    uint32_t TextureFormatPixelSize(nxt::TextureFormat format);
    bool TextureFormatHasDepth(nxt::TextureFormat format);
    bool TextureFormatHasStencil(nxt::TextureFormat format);
    bool TextureFormatHasDepthOrStencil(nxt::TextureFormat format);

    class TextureBase : public RefCounted {
      public:
        TextureBase(TextureBuilder* builder);

        nxt::TextureDimension GetDimension() const;
        nxt::TextureFormat GetFormat() const;
        uint32_t GetWidth() const;
        uint32_t GetHeight() const;
        uint32_t GetDepth() const;
        uint32_t GetNumMipLevels() const;
        nxt::TextureUsageBit GetAllowedUsage() const;
        nxt::TextureUsageBit GetUsage() const;
        bool IsFrozen() const;
        bool HasFrozenUsage(nxt::TextureUsageBit usage) const;
        static bool IsUsagePossible(nxt::TextureUsageBit allowedUsage, nxt::TextureUsageBit usage);
        bool IsTransitionPossible(nxt::TextureUsageBit usage) const;
        void UpdateUsageInternal(nxt::TextureUsageBit usage);

        DeviceBase* GetDevice() const;

        // NXT API
        TextureViewBuilder* CreateTextureViewBuilder();
        void TransitionUsage(nxt::TextureUsageBit usage);
        void FreezeUsage(nxt::TextureUsageBit usage);

        virtual void TransitionUsageImpl(nxt::TextureUsageBit currentUsage,
                                         nxt::TextureUsageBit targetUsage) = 0;

      private:
        DeviceBase* mDevice;

        nxt::TextureDimension mDimension;
        nxt::TextureFormat mFormat;
        uint32_t mWidth, mHeight, mDepth;
        uint32_t mNumMipLevels;
        nxt::TextureUsageBit mAllowedUsage = nxt::TextureUsageBit::None;
        nxt::TextureUsageBit mCurrentUsage = nxt::TextureUsageBit::None;
        bool mIsFrozen = false;
    };

    class TextureBuilder : public Builder<TextureBase> {
      public:
        TextureBuilder(DeviceBase* device);

        // NXT API
        void SetDimension(nxt::TextureDimension dimension);
        void SetExtent(uint32_t width, uint32_t height, uint32_t depth);
        void SetFormat(nxt::TextureFormat format);
        void SetMipLevels(uint32_t numMipLevels);
        void SetAllowedUsage(nxt::TextureUsageBit usage);
        void SetInitialUsage(nxt::TextureUsageBit usage);

      private:
        friend class TextureBase;

        TextureBase* GetResultImpl() override;

        int mPropertiesSet = 0;

        nxt::TextureDimension mDimension;
        uint32_t mWidth, mHeight, mDepth;
        nxt::TextureFormat mFormat;
        uint32_t mNumMipLevels;
        nxt::TextureUsageBit mAllowedUsage = nxt::TextureUsageBit::None;
        nxt::TextureUsageBit mCurrentUsage = nxt::TextureUsageBit::None;
    };

    class TextureViewBase : public RefCounted {
      public:
        TextureViewBase(TextureViewBuilder* builder);

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

      private:
        Ref<TextureBase> mTexture;
    };

    class TextureViewBuilder : public Builder<TextureViewBase> {
      public:
        TextureViewBuilder(DeviceBase* device, TextureBase* texture);

      private:
        friend class TextureViewBase;

        TextureViewBase* GetResultImpl() override;

        Ref<TextureBase> mTexture;
    };

}  // namespace backend

#endif  // BACKEND_TEXTURE_H_