GLTexture2D.h

#pragma once
#include "GLType.h"
#include <map>

namespace ParaEngine
{
    class Image;
    class GLProgram;
    typedef struct _MipmapInfo MipmapInfo;


    class Texture2D : public CRefCountedOne
    {
    public:
        enum class PixelFormat
        {
            AUTO,
            BGRA8888,
            RGBA8888,
            RGB888,
            RGB565,
            A8,
            I8,
            AI88,
            RGBA4444,
            RGB5A1,
            PVRTC4,
            PVRTC4A,
            PVRTC2,
            PVRTC2A,
            ETC,
            S3TC_DXT1,
            S3TC_DXT3,
            S3TC_DXT5,
            ATC_RGB,
            ATC_EXPLICIT_ALPHA,
            ATC_INTERPOLATED_ALPHA,
            DEFAULT = AUTO,

            NONE = -1
        };


        struct PixelFormatInfo {

            PixelFormatInfo(GLenum anInternalFormat, GLenum aFormat, GLenum aType, int aBpp, bool aCompressed, bool anAlpha)
                : internalFormat(anInternalFormat)
                , format(aFormat)
                , type(aType)
                , bpp(aBpp)
                , compressed(aCompressed)
                , alpha(anAlpha)
            {}

            GLenum internalFormat;
            GLenum format;
            GLenum type;
            int bpp;
            bool compressed;
            bool alpha;
        };

        typedef std::map<Texture2D::PixelFormat, const PixelFormatInfo> PixelFormatInfoMap;


        typedef struct _TexParams {
            GLuint    minFilter;
            GLuint    magFilter;
            GLuint    wrapS;
            GLuint    wrapT;
        }TexParams;

        Texture2D();
        virtual ~Texture2D();

        bool initWithImage(Image * image);
        bool initWithImage(Image * image, PixelFormat format);



        int getNumberOfMipmaps();


        int getPixelsWide() const;

        int getPixelsHigh() const;


        bool initWithData(const void *data, size_t dataLen, Texture2D::PixelFormat pixelFormat, int pixelsWide, int pixelsHigh, const Size& contentSize);

        bool updateWithData(const void *data, int offsetX, int offsetY, int width, int height);

        GLuint getName() const;
        void setTexParameters(const TexParams& texParams);
        void setAliasTexParameters();
        void setAntiAliasTexParameters();

        static const PixelFormatInfoMap& getPixelFormatInfoMap();

    private:
        static Texture2D::PixelFormat g_defaultAlphaPixelFormat;

        Texture2D::PixelFormat _pixelFormat;

        int _pixelsWide;

        int _pixelsHigh;

        GLuint _name;

        GLfloat _maxS;

        GLfloat _maxT;

        Size _contentSize;

        bool _hasPremultipliedAlpha;

        bool _hasMipmaps;

        GLProgram* _shaderProgram;

        static const PixelFormatInfoMap _pixelFormatInfoTables;

        bool _antialiasEnabled;

        bool _valid;
        std::string _filePath;

        Texture2D* _alphaTexture;



        bool initWithMipmaps(MipmapInfo* mipmaps, int mipmapsNum, PixelFormat pixelFormat, int pixelsWide, int pixelsHigh);

        void setGLProgram(GLProgram* shaderProgram);

        static Texture2D::PixelFormat convertDataToFormat(const unsigned char* data, size_t dataLen, PixelFormat originFormat, PixelFormat format, unsigned char** outData, size_t* outDataLen);

        static PixelFormat convertI8ToFormat(const unsigned char* data, size_t dataLen, PixelFormat format, unsigned char** outData, size_t* outDataLen);
        static PixelFormat convertAI88ToFormat(const unsigned char* data, size_t dataLen, PixelFormat format, unsigned char** outData, size_t* outDataLen);
        static PixelFormat convertRGB888ToFormat(const unsigned char* data, size_t dataLen, PixelFormat format, unsigned char** outData, size_t* outDataLen);
        static PixelFormat convertRGBA8888ToFormat(const unsigned char* data, size_t dataLen, PixelFormat format, unsigned char** outData, size_t* outDataLen);

        //I8 to XXX
        static void convertI8ToRGB888(const unsigned char* data, size_t dataLen, unsigned char* outData);
        static void convertI8ToRGBA8888(const unsigned char* data, size_t dataLen, unsigned char* outData);
        static void convertI8ToRGB565(const unsigned char* data, size_t dataLen, unsigned char* outData);
        static void convertI8ToRGBA4444(const unsigned char* data, size_t dataLen, unsigned char* outData);
        static void convertI8ToRGB5A1(const unsigned char* data, size_t dataLen, unsigned char* outData);
        static void convertI8ToAI88(const unsigned char* data, size_t dataLen, unsigned char* outData);

        //AI88 to XXX
        static void convertAI88ToRGB888(const unsigned char* data, size_t dataLen, unsigned char* outData);
        static void convertAI88ToRGBA8888(const unsigned char* data, size_t dataLen, unsigned char* outData);
        static void convertAI88ToRGB565(const unsigned char* data, size_t dataLen, unsigned char* outData);
        static void convertAI88ToRGBA4444(const unsigned char* data, size_t dataLen, unsigned char* outData);
        static void convertAI88ToRGB5A1(const unsigned char* data, size_t dataLen, unsigned char* outData);
        static void convertAI88ToA8(const unsigned char* data, size_t dataLen, unsigned char* outData);
        static void convertAI88ToI8(const unsigned char* data, size_t dataLen, unsigned char* outData);

        //RGB888 to XXX
        static void convertRGB888ToRGBA8888(const unsigned char* data, size_t dataLen, unsigned char* outData);
        static void convertRGB888ToRGB565(const unsigned char* data, size_t dataLen, unsigned char* outData);
        static void convertRGB888ToA8(const unsigned char* data, size_t dataLen, unsigned char* outData);
        static void convertRGB888ToI8(const unsigned char* data, size_t dataLen, unsigned char* outData);
        static void convertRGB888ToAI88(const unsigned char* data, size_t dataLen, unsigned char* outData);
        static void convertRGB888ToRGBA4444(const unsigned char* data, size_t dataLen, unsigned char* outData);
        static void convertRGB888ToRGB5A1(const unsigned char* data, size_t dataLen, unsigned char* outData);

        //RGBA8888 to XXX
        static void convertRGBA8888ToRGB888(const unsigned char* data, size_t dataLen, unsigned char* outData);
        static void convertRGBA8888ToRGB565(const unsigned char* data, size_t dataLen, unsigned char* outData);
        static void convertRGBA8888ToI8(const unsigned char* data, size_t dataLen, unsigned char* outData);
        static void convertRGBA8888ToA8(const unsigned char* data, size_t dataLen, unsigned char* outData);
        static void convertRGBA8888ToAI88(const unsigned char* data, size_t dataLen, unsigned char* outData);
        static void convertRGBA8888ToRGBA4444(const unsigned char* data, size_t dataLen, unsigned char* outData);
        static void convertRGBA8888ToRGB5A1(const unsigned char* data, size_t dataLen, unsigned char* outData);
    };
}