/****************************************************************************
 Copyright (c) 2018-2019 Xiamen Yaji Software Co., Ltd.

 http://www.cocos2d-x.org

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 ****************************************************************************/
 
#pragma once

#include "Types.h"
#include "base/CCRef.h"
#include <cassert>

#include <functional>

CC_BACKEND_BEGIN

struct TextureDescriptor
{
    TextureType textureType = TextureType::TEXTURE_2D;
    PixelFormat textureFormat = PixelFormat::RGBA8888;
    TextureUsage textureUsage = TextureUsage::READ;
    uint32_t width = 0;
    uint32_t height = 0;
    uint32_t depth = 0;
    SamplerDescriptor samplerDescriptor;
};

class TextureBackend : public Ref
{
public:
    virtual void updateSamplerDescriptor(const SamplerDescriptor &sampler) = 0;
    virtual void getBytes(int x, int y, int width, int height, bool flipImage, std::function<void(const unsigned char*, int, int)> callback) = 0;
    virtual void generateMipmaps() = 0;
    virtual void updateTextureDescriptor(const TextureDescriptor& descriptor);

    inline PixelFormat getTextureFormat() const { return _textureFormat; }
    inline TextureUsage getTextureUsage() const { return _textureUsage; }
    inline TextureType getTextureType() const { return _textureType; }
    inline bool hasMipmaps() const { return _hasMipmaps; }

protected:
    TextureBackend(const TextureDescriptor& descriptor);
    virtual ~TextureBackend();
        
    // The bytes of all components.
    uint8_t _bitsPerElement = 0;
    bool _hasMipmaps = false;
    bool _isCompressed = false;
    uint32_t _width = 0;
    uint32_t _height = 0;

    TextureType _textureType = TextureType::TEXTURE_2D;
    PixelFormat _textureFormat = PixelFormat::RGBA8888;
    TextureUsage _textureUsage = TextureUsage::READ;
};


class Texture2DBackend : public TextureBackend
{
public:
    virtual void updateData(uint8_t* data, uint32_t width , uint32_t height, uint32_t level) = 0;
    virtual void updateCompressedData(uint8_t* data, uint32_t width , uint32_t height, uint32_t dataLen, uint32_t level) = 0;
    virtual void updateSubData(uint32_t xoffset, uint32_t yoffset, uint32_t width, uint32_t height, uint32_t level, uint8_t* data) = 0;
    virtual void updateCompressedSubData(uint32_t xoffset, uint32_t yoffset, uint32_t width, uint32_t height, uint32_t dataLen, uint32_t level, uint8_t* data) = 0;

    inline uint32_t getWidth() const { return _width; }
    inline uint32_t getHeight() const { return _height; }

protected:
    Texture2DBackend(const TextureDescriptor& descriptor);
};

class TextureCubemapBackend : public TextureBackend
{
public:
    virtual void updateFaceData(TextureCubeFace side, void *data) = 0;
        
protected:
    TextureCubemapBackend(const TextureDescriptor& descriptor);
};

CC_BACKEND_END