#include "UtilsGL.h"
#include "ProgramGL.h"
#include "renderer/backend/Types.h"

CC_BACKEND_BEGIN


GLenum UtilsGL::toGLAttributeType(VertexFormat vertexFormat)
{
    GLenum ret = GL_INT;
    switch (vertexFormat)
    {
    case VertexFormat::FLOAT4:
    case VertexFormat::FLOAT3:
    case VertexFormat::FLOAT2:
    case VertexFormat::FLOAT:
        ret = GL_FLOAT;
        break;
    case VertexFormat::INT4:
    case VertexFormat::INT3:
    case VertexFormat::INT2:
    case VertexFormat::INT:
        ret = GL_INT;
        break;
    case VertexFormat::UBYTE4:
        ret = GL_UNSIGNED_BYTE;
        break;
    default:
        break;
    }
    return ret;
}

GLsizei UtilsGL::getGLAttributeSize(VertexFormat vertexFormat)
{
    GLsizei ret = 0;
    switch (vertexFormat)
    {
    case VertexFormat::FLOAT4:
    case VertexFormat::INT4:
    case VertexFormat::UBYTE4:
        ret = 4;
        break;
    case VertexFormat::FLOAT3:
    case VertexFormat::INT3:
        ret = 3;
        break;
    case VertexFormat::FLOAT2:
    case VertexFormat::INT2:
        ret = 2;
        break;
    case VertexFormat::FLOAT:
    case VertexFormat::INT:
        ret = 1;
        break;
    default:
        break;
    }
    return ret;
}

GLsizei UtilsGL::getGLDataTypeSize(GLenum size)
{
    GLsizei ret = 0;
    switch (size)
    {
    case GL_BOOL:
    case GL_BYTE:
    case GL_UNSIGNED_BYTE:
        ret = sizeof(GLbyte);
        break;
    case GL_BOOL_VEC2:
    case GL_SHORT:
    case GL_UNSIGNED_SHORT:
        ret = sizeof(GLshort);
        break;
    case GL_BOOL_VEC3:
        ret = sizeof(GLboolean);
        break;
    case GL_BOOL_VEC4:
    case GL_INT:
    case GL_UNSIGNED_INT:
    case GL_FLOAT:
        ret = sizeof(GLfloat);
        break;
    case GL_FLOAT_VEC2:
    case GL_INT_VEC2:
        ret = sizeof(GLfloat) * 2;
        break;
    case GL_FLOAT_VEC3:
    case GL_INT_VEC3:
        ret = sizeof(GLfloat) * 3;
        break;
    case GL_FLOAT_MAT2:
    case GL_FLOAT_VEC4:
    case GL_INT_VEC4:
        ret = sizeof(GLfloat) * 4;
        break;
    case GL_FLOAT_MAT3:
        ret = sizeof(GLfloat) * 9;
        break;
    case GL_FLOAT_MAT4:
        ret = sizeof(GLfloat) * 16;
        break;
    default:
        break;
    }
    return ret;
}


GLint UtilsGL::toGLMagFilter(SamplerFilter magFilter)
{
    GLint ret = GL_LINEAR;
    switch (magFilter)
    {
    case SamplerFilter::LINEAR:
        ret = GL_LINEAR;
        break;
    case SamplerFilter::NEAREST:
        ret = GL_NEAREST;
        break;
    default:
        break;
    }
    return ret;
}

GLint UtilsGL::toGLMinFilter(SamplerFilter minFilter, SamplerFilter mipmapFilter, bool mipmapEnabled, bool isPow2)
{
    if (mipmapEnabled)
    {
        if (!isPow2)
        {
            cocos2d::log("Change minification filter to either NEAREST or LINEAR since non-power-of-two texture occur in %s %s %d", __FILE__, __FUNCTION__, __LINE__);
            if (SamplerFilter::LINEAR == minFilter)
                return GL_LINEAR;
            else
                return GL_NEAREST;
        }

        switch (minFilter)
        {
        case SamplerFilter::LINEAR:
            switch (mipmapFilter)
            {
            case SamplerFilter::LINEAR:
                return GL_LINEAR_MIPMAP_LINEAR;
            case SamplerFilter::NEAREST:
                return GL_LINEAR_MIPMAP_NEAREST;
            case SamplerFilter::DONT_CARE:
                return GL_LINEAR_MIPMAP_NEAREST;
            }
        case SamplerFilter::NEAREST:
            switch (mipmapFilter)
            {
            case SamplerFilter::LINEAR:
                return GL_NEAREST_MIPMAP_LINEAR;
            case SamplerFilter::NEAREST:
                return GL_NEAREST_MIPMAP_NEAREST;
            case SamplerFilter::DONT_CARE:
                return GL_LINEAR_MIPMAP_NEAREST;
            }
        }
    }
    else
    {
        if (SamplerFilter::LINEAR == minFilter)
            return GL_LINEAR;
        else
            return GL_NEAREST;
    }
    return GL_NEAREST;
}

GLint UtilsGL::toGLAddressMode(SamplerAddressMode addressMode, bool isPow2)
{
    GLint ret = GL_REPEAT;
    if (!isPow2 && (addressMode != SamplerAddressMode::CLAMP_TO_EDGE))
    {
        cocos2d::log("Change texture wrap mode to CLAMP_TO_EDGE since non-power-of-two texture occur in %s %s %d", __FILE__, __FUNCTION__, __LINE__);
        return GL_CLAMP_TO_EDGE;
    }

    switch (addressMode)
    {
    case SamplerAddressMode::REPEAT:
        ret = GL_REPEAT;
        break;
    case SamplerAddressMode::MIRROR_REPEAT:
        ret = GL_MIRRORED_REPEAT;
        break;
    case SamplerAddressMode::CLAMP_TO_EDGE:
        ret = GL_CLAMP_TO_EDGE;
        break;
    default:
        break;
    }
    return ret;
}


void UtilsGL::toGLTypes(TextureFormat textureFormat, GLint &internalFormat, GLuint &format, GLenum &type, bool &isCompressed)
{
    switch (textureFormat)
    {
    case TextureFormat::R8G8B8A8:
        internalFormat = GL_RGBA;
        format = GL_RGBA;
        type = GL_UNSIGNED_BYTE;
        break;
    case TextureFormat::R8G8B8:
        internalFormat = GL_RGB;
        format = GL_RGB;
        type = GL_UNSIGNED_BYTE;
        break;
    case TextureFormat::RGBA4444:
        internalFormat = GL_RGBA;
        format = GL_RGBA;
        type = GL_UNSIGNED_SHORT_4_4_4_4;
        break;
    case TextureFormat::A8:
        internalFormat = GL_ALPHA;
        format = GL_ALPHA;
        type = GL_UNSIGNED_BYTE;
        break;
    case TextureFormat::I8:
        internalFormat = GL_LUMINANCE;
        format = GL_LUMINANCE;
        type = GL_UNSIGNED_BYTE;
        break;
    case TextureFormat::AI88:
        internalFormat = GL_LUMINANCE_ALPHA;
        format = GL_LUMINANCE_ALPHA;
        type = GL_UNSIGNED_BYTE;
        break;
    case TextureFormat::RGB565:
        internalFormat = GL_RGB;
        format = GL_RGB;
        type = GL_UNSIGNED_SHORT_5_6_5;
        break;
    case TextureFormat::RGB5A1:
        internalFormat = GL_RGBA;
        format = GL_RGBA;
        type = GL_UNSIGNED_SHORT_5_5_5_1;
        break;
#ifdef GL_ETC1_RGB8_OES
    case TextureFormat::ETC1:
        internalFormat = GL_ETC1_RGB8_OES;
        format = 0xFFFFFFFF;
        type = 0xFFFFFFFF;
        isCompressed = true;
        break;
#endif // GL_ETC1_RGB8_OES
#ifdef GL_ATC_RGB_AMD
    case TextureFormat::ATC_RGB:
        internalFormat = GL_ATC_RGB_AMD;
        format = 0xFFFFFFFF;
        type = 0xFFFFFFFF;
        isCompressed = true;
        break;
#endif // GL_ATC_RGB_AMD
#ifdef GL_ATC_RGBA_EXPLICIT_ALPHA_AMD
    case TextureFormat::ATC_EXPLICIT_ALPHA:
        internalFormat = GL_ATC_RGBA_EXPLICIT_ALPHA_AMD;
        format = 0xFFFFFFFF;
        type = 0xFFFFFFFF;
        isCompressed = true;
#endif // GL_ATC_RGBA_EXPLICIT_ALPHA_AMD
#ifdef GL_ATC_RGBA_INTERPOLATED_ALPHA_AMD
    case TextureFormat::ATC_INTERPOLATED_ALPHA:
        internalFormat = GL_ATC_RGBA_INTERPOLATED_ALPHA_AMD;
        format = 0xFFFFFFFF;
        type = 0xFFFFFFFF;
        isCompressed = true;
        break;
#endif // GL_ATC_RGBA_INTERPOLATED_ALPHA_AMD

#ifdef GL_COMPRESSED_RGB_PVRTC_2BPPV1_IMG
    case TextureFormat::PVRTC2:
        internalFormat = GL_COMPRESSED_RGB_PVRTC_2BPPV1_IMG;
        format = 0xFFFFFFFF;
        type = 0xFFFFFFFF;
        isCompressed = true;
        break;
#endif 
#ifdef GL_COMPRESSED_RGBA_PVRTC_2BPPV1_IMG
    case TextureFormat::PVRTC2A:
        internalFormat = GL_COMPRESSED_RGBA_PVRTC_2BPPV1_IMG;
        format = 0xFFFFFFFF;
        type = 0xFFFFFFFF;
        isCompressed = true;
        break;
#endif
#ifdef GL_COMPRESSED_RGB_PVRTC_4BPPV1_IMG
    case TextureFormat::PVRTC4:
        internalFormat = GL_COMPRESSED_RGB_PVRTC_4BPPV1_IMG;
        format = 0xFFFFFFFF;
        type = 0xFFFFFFFF;
        isCompressed = true;
        break;
#endif
#ifdef GL_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG
    case TextureFormat::PVRTC4A:
        internalFormat = GL_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG;
        format = 0xFFFFFFFF;
        type = 0xFFFFFFFF;
        isCompressed = true;
        break;
#endif
#ifdef GL_COMPRESSED_RGBA_S3TC_DXT1_EXT
    case TextureFormat::S3TC_DXT1:
        internalFormat = GL_COMPRESSED_RGBA_S3TC_DXT1_EXT;
        format = 0xFFFFFFFF;
        type = 0xFFFFFFFF;
        isCompressed = true;
        break;
#endif 
#ifdef GL_COMPRESSED_RGBA_S3TC_DXT3_EXT
    case TextureFormat::S3TC_DXT3:
        internalFormat = GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
        format = 0xFFFFFFFF;
        type = 0xFFFFFFFF;
        isCompressed = true;
        break;
#endif
#ifdef GL_COMPRESSED_RGBA_S3TC_DXT5_EXT
    case TextureFormat::S3TC_DXT5:
        internalFormat = GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
        format = 0xFFFFFFFF;
        type = 0xFFFFFFFF;
        isCompressed = true;
        break;
#endif
        //        case TextureFormat::D16:
        //            format = GL_DEPTH_COMPONENT;
        //            internalFormat = GL_DEPTH_COMPONENT;
        //            type = GL_UNSIGNED_INT;
    case TextureFormat::D24S8:
#ifdef CC_USE_GLES
        format = GL_DEPTH_STENCIL_OES;
        internalFormat = GL_DEPTH_STENCIL_OES;
        type = GL_UNSIGNED_INT_24_8_OES;
#else
        format = GL_DEPTH_STENCIL;
        internalFormat = GL_DEPTH24_STENCIL8;
        type = GL_UNSIGNED_INT_24_8;
#endif
        break;
    default:
        break;
    }
}


GLenum UtilsGL::toGLComareFunction(CompareFunction compareFunction)
{
    GLenum ret = GL_ALWAYS;
    switch (compareFunction)
    {
    case CompareFunction::NEVER:
        ret = GL_NEVER;
        break;
    case CompareFunction::LESS:
        ret = GL_LESS;
        break;
    case CompareFunction::LESS_EQUAL:
        ret = GL_LEQUAL;
        break;
    case CompareFunction::GREATER:
        ret = GL_GREATER;
        break;
    case CompareFunction::GREATER_EQUAL:
        ret = GL_GEQUAL;
        break;
    case CompareFunction::NOT_EQUAL:
        ret = GL_NOTEQUAL;
        break;
    case CompareFunction::EQUAL:
        ret = GL_EQUAL;
        break;
    case CompareFunction::ALWAYS:
        ret = GL_ALWAYS;
        break;
    default:
        break;
    }
    return ret;
}

GLenum UtilsGL::toGLStencilOperation(StencilOperation stencilOperation)
{
    GLenum ret = GL_KEEP;
    switch (stencilOperation)
    {
    case StencilOperation::KEEP:
        ret = GL_KEEP;
        break;
    case StencilOperation::ZERO:
        ret = GL_ZERO;
        break;
    case StencilOperation::REPLACE:
        ret = GL_REPLACE;
        break;
    case StencilOperation::INVERT:
        ret = GL_INVERT;
        break;
    case StencilOperation::INCREMENT_WRAP:
        ret = GL_INCR_WRAP;
        break;
    case StencilOperation::DECREMENT_WRAP:
        ret = GL_DECR_WRAP;
        break;
    default:
        break;
    }
    return ret;
}


GLenum UtilsGL::toGLBlendOperation(BlendOperation blendOperation)
{
    GLenum ret = GL_FUNC_ADD;
    switch (blendOperation)
    {
    case BlendOperation::ADD:
        ret = GL_FUNC_ADD;
        break;
    case BlendOperation::SUBTRACT:
        ret = GL_FUNC_SUBTRACT;
        break;
    case BlendOperation::RESERVE_SUBTRACT:
        ret = GL_FUNC_REVERSE_SUBTRACT;
        break;
    default:
        break;
    }
    return ret;
}

GLenum UtilsGL::toGLBlendFactor(BlendFactor blendFactor)
{
    GLenum ret = GL_ONE;
    switch (blendFactor)
    {
    case BlendFactor::ZERO:
        ret = GL_ZERO;
        break;
    case BlendFactor::ONE:
        ret = GL_ONE;
        break;
    case BlendFactor::SRC_COLOR:
        ret = GL_SRC_COLOR;
        break;
    case BlendFactor::ONE_MINUS_SRC_COLOR:
        ret = GL_ONE_MINUS_SRC_COLOR;
        break;
    case BlendFactor::SRC_ALPHA:
        ret = GL_SRC_ALPHA;
        break;
    case BlendFactor::ONE_MINUS_SRC_ALPHA:
        ret = GL_ONE_MINUS_SRC_ALPHA;
        break;
    case BlendFactor::DST_COLOR:
        ret = GL_DST_COLOR;
        break;
    case BlendFactor::ONE_MINUS_DST_COLOR:
        ret = GL_ONE_MINUS_DST_COLOR;
        break;
    case BlendFactor::DST_ALPHA:
        ret = GL_DST_ALPHA;
        break;
    case BlendFactor::ONE_MINUS_DST_ALPHA:
        ret = GL_ONE_MINUS_DST_ALPHA;
        break;
    case BlendFactor::SRC_ALPHA_SATURATE:
        ret = GL_SRC_ALPHA_SATURATE;
        break;
    case BlendFactor::BLEND_CLOLOR:
        ret = GL_BLEND_COLOR;
        break;
    default:
        break;
    }
    return ret;
}

GLenum UtilsGL::toGLFrontFace(Winding winding)
{
    if (Winding::CLOCK_WISE == winding)
        return GL_CW;
    else
        return GL_CCW;
}

GLenum UtilsGL::toGLPrimitiveType(PrimitiveType primitiveType)
{
    GLenum ret = GL_TRIANGLES;
    switch (primitiveType)
    {
    case PrimitiveType::POINT:
        ret = GL_POINTS;
        break;
    case PrimitiveType::LINE:
        ret = GL_LINES;
        break;
    case PrimitiveType::LINE_STRIP:
        ret = GL_LINE_STRIP;
        break;
    case PrimitiveType::TRIANGLE:
        ret = GL_TRIANGLES;
        break;
    case PrimitiveType::TRIANGLE_STRIP:
        ret = GL_TRIANGLE_STRIP;
        break;
    default:
        break;
    }
    return ret;
}

GLenum UtilsGL::toGLIndexType(IndexFormat indexType)
{
    GLenum ret = GL_BYTE;
    switch (indexType)
    {
    case IndexFormat::U_INT:
        ret = GL_UNSIGNED_INT;
        break;
    case IndexFormat::U_SHORT:
        ret = GL_UNSIGNED_SHORT;
        break;
    default:
        break;
    }
    return ret;
}

GLenum UtilsGL::toGLCullMode(CullMode mode)
{
    if (CullMode::BACK == mode)
        return GL_BACK;
    else
        return GL_FRONT;
}

CC_BACKEND_END