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Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2008      Apple Inc. All Rights Reserved.

http://www.cocos2d-x.org

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of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
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all copies or substantial portions of the Software.

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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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****************************************************************************/



/*
* Support for RGBA_4_4_4_4 and RGBA_5_5_5_1 was copied from:
* https://devforums.apple.com/message/37855#37855 by a1studmuffin
*/

#include "CCTexture2D.h"
#include "ccConfig.h"
#include "ccMacros.h"
#include "CCConfiguration.h"
#include "platform/CCImage.h"
#include "CCGL.h"
#include "support/ccUtils.h"
#include "platform/CCPlatformMacros.h"
#include "textures/CCTexturePVR.h"
#include "textures/CCTextureETC.h"
#include "CCDirector.h"
#include "shaders/CCGLProgram.h"
#include "shaders/ccGLStateCache.h"
#include "shaders/CCShaderCache.h"

#if CC_ENABLE_CACHE_TEXTURE_DATA
    #include "CCTextureCache.h"
#endif

NS_CC_BEGIN

//CLASS IMPLEMENTATIONS:

// If the image has alpha, you can create RGBA8 (32-bit) or RGBA4 (16-bit) or RGB5A1 (16-bit)
// Default is: RGBA8888 (32-bit textures)
static Texture2D::PixelFormat g_defaultAlphaPixelFormat = Texture2D::PixelFormat::DEFAULT;

// By default PVR images are treated as if they don't have the alpha channel premultiplied
static bool PVRHaveAlphaPremultiplied_ = false;

Texture2D::Texture2D()
: _PVRHaveAlphaPremultiplied(true)
, _pixelsWide(0)
, _pixelsHigh(0)
, _pixelFormat(Texture2D::PixelFormat::DEFAULT)
, _name(0)
, _maxS(0.0)
, _maxT(0.0)
, _hasPremultipliedAlpha(false)
, _hasMipmaps(false)
, _shaderProgram(NULL)
{
}

Texture2D::~Texture2D()
{
#if CC_ENABLE_CACHE_TEXTURE_DATA
    VolatileTexture::removeTexture(this);
#endif

    CCLOGINFO("cocos2d: deallocing Texture2D %u.", _name);
    CC_SAFE_RELEASE(_shaderProgram);

    if(_name)
    {
        ccGLDeleteTexture(_name);
    }
}

Texture2D::PixelFormat Texture2D::getPixelFormat() const
{
    return _pixelFormat;
}

unsigned int Texture2D::getPixelsWide() const
{
    return _pixelsWide;
}

unsigned int Texture2D::getPixelsHigh() const
{
    return _pixelsHigh;
}

GLuint Texture2D::getName() const
{
    return _name;
}

Size Texture2D::getContentSize() const
{
    Size ret;
    ret.width = _contentSize.width / CC_CONTENT_SCALE_FACTOR();
    ret.height = _contentSize.height / CC_CONTENT_SCALE_FACTOR();
    
    return ret;
}

const Size& Texture2D::getContentSizeInPixels()
{
    return _contentSize;
}

GLfloat Texture2D::getMaxS() const
{
    return _maxS;
}

void Texture2D::setMaxS(GLfloat maxS)
{
    _maxS = maxS;
}

GLfloat Texture2D::getMaxT() const
{
    return _maxT;
}

void Texture2D::setMaxT(GLfloat maxT)
{
    _maxT = maxT;
}

GLProgram* Texture2D::getShaderProgram() const
{
    return _shaderProgram;
}

void Texture2D::setShaderProgram(GLProgram* pShaderProgram)
{
    CC_SAFE_RETAIN(pShaderProgram);
    CC_SAFE_RELEASE(_shaderProgram);
    _shaderProgram = pShaderProgram;
}

void Texture2D::releaseData(void *data)
{
    free(data);
}

void* Texture2D::keepData(void *data, unsigned int length)
{
    CC_UNUSED_PARAM(length);
    //The texture data mustn't be saved because it isn't a mutable texture.
    return data;
}

bool Texture2D::hasPremultipliedAlpha() const
{
    return _hasPremultipliedAlpha;
}

bool Texture2D::initWithData(const void *data, Texture2D::PixelFormat pixelFormat, unsigned int pixelsWide, unsigned int pixelsHigh, const Size& contentSize)
{
    unsigned int bitsPerPixel;
    //Hack: bitsPerPixelForFormat returns wrong number for RGB_888 textures. See function.
    if(pixelFormat == Texture2D::PixelFormat::RGB888)
    {
        bitsPerPixel = 24;
    }
    else
    {
        bitsPerPixel = getBitsPerPixelForFormat(pixelFormat);
    }

    unsigned int bytesPerRow = pixelsWide * bitsPerPixel / 8;

    if(bytesPerRow % 8 == 0)
    {
        glPixelStorei(GL_UNPACK_ALIGNMENT, 8);
    }
    else if(bytesPerRow % 4 == 0)
    {
        glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
    }
    else if(bytesPerRow % 2 == 0)
    {
        glPixelStorei(GL_UNPACK_ALIGNMENT, 2);
    }
    else
    {
        glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
    }


    glGenTextures(1, &_name);
    ccGLBindTexture2D(_name);

    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );

    // Specify OpenGL texture image

    switch(pixelFormat)
    {
    case Texture2D::PixelFormat::RGBA8888:
        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, (GLsizei)pixelsWide, (GLsizei)pixelsHigh, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
        break;
    case Texture2D::PixelFormat::RGB888:
        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, (GLsizei)pixelsWide, (GLsizei)pixelsHigh, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
        break;
    case Texture2D::PixelFormat::RGBA4444:
        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, (GLsizei)pixelsWide, (GLsizei)pixelsHigh, 0, GL_RGBA, GL_UNSIGNED_SHORT_4_4_4_4, data);
        break;
    case Texture2D::PixelFormat::RGB5A1:
        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, (GLsizei)pixelsWide, (GLsizei)pixelsHigh, 0, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1, data);
        break;
    case Texture2D::PixelFormat::RGB565:
        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, (GLsizei)pixelsWide, (GLsizei)pixelsHigh, 0, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, data);
        break;
    case Texture2D::PixelFormat::AI88:
        glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE_ALPHA, (GLsizei)pixelsWide, (GLsizei)pixelsHigh, 0, GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, data);
        break;
    case Texture2D::PixelFormat::A8:
        glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, (GLsizei)pixelsWide, (GLsizei)pixelsHigh, 0, GL_ALPHA, GL_UNSIGNED_BYTE, data);
        break;
    case Texture2D::PixelFormat::I8:
        glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, (GLsizei)pixelsWide, (GLsizei)pixelsHigh, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, data);
        break;
    default:
        CCASSERT(0, "NSInternalInconsistencyException");

    }

    _contentSize = contentSize;
    _pixelsWide = pixelsWide;
    _pixelsHigh = pixelsHigh;
    _pixelFormat = pixelFormat;
    _maxS = contentSize.width / (float)(pixelsWide);
    _maxT = contentSize.height / (float)(pixelsHigh);

    _hasPremultipliedAlpha = false;
    _hasMipmaps = false;

    setShaderProgram(ShaderCache::getInstance()->programForKey(GLProgram::SHADER_NAME_POSITION_TEXTURE));

    return true;
}


const char* Texture2D::description(void) const
{
    return String::createWithFormat("<Texture2D | Name = %u | Dimensions = %u x %u | Coordinates = (%.2f, %.2f)>", _name, _pixelsWide, _pixelsHigh, _maxS, _maxT)->getCString();
}

// implementation Texture2D (Image)

bool Texture2D::initWithImage(Image *uiImage)
{
    if (uiImage == NULL)
    {
        CCLOG("cocos2d: Texture2D. Can't create Texture. UIImage is nil");
        return false;
    }
    
    unsigned int imageWidth = uiImage->getWidth();
    unsigned int imageHeight = uiImage->getHeight();
    
    Configuration *conf = Configuration::getInstance();
    
    unsigned maxTextureSize = conf->getMaxTextureSize();
    if (imageWidth > maxTextureSize || imageHeight > maxTextureSize) 
    {
        CCLOG("cocos2d: WARNING: Image (%u x %u) is bigger than the supported %u x %u", imageWidth, imageHeight, maxTextureSize, maxTextureSize);
        return false;
    }
    
    // always load premultiplied images
    return initPremultipliedATextureWithImage(uiImage, imageWidth, imageHeight);
}

bool Texture2D::initPremultipliedATextureWithImage(Image *image, unsigned int width, unsigned int height)
{
    unsigned char*            tempData = image->getData();
    unsigned int*             inPixel32  = NULL;
    unsigned char*            inPixel8 = NULL;
    unsigned short*           outPixel16 = NULL;
    bool                      hasAlpha = image->hasAlpha();
    Size                    imageSize = Size((float)(image->getWidth()), (float)(image->getHeight()));
    Texture2D::PixelFormat    pixelFormat;
    size_t                    bpp = image->getBitsPerComponent();

    // compute pixel format
    if (hasAlpha)
    {
    	pixelFormat = g_defaultAlphaPixelFormat;
    }
    else
    {
        if (bpp >= 8)
        {
            pixelFormat = Texture2D::PixelFormat::RGB888;
        }
        else 
        {
            pixelFormat = Texture2D::PixelFormat::RGB565;
        }
        
    }
    
    // Repack the pixel data into the right format
    unsigned int length = width * height;

    if (pixelFormat == Texture2D::PixelFormat::RGB565)
    {
        if (hasAlpha)
        {
            // Convert "RRRRRRRRRGGGGGGGGBBBBBBBBAAAAAAAA" to "RRRRRGGGGGGBBBBB"
            
            tempData = new unsigned char[width * height * 2];
            outPixel16 = (unsigned short*)tempData;
            inPixel32 = (unsigned int*)image->getData();
            
            for(unsigned int i = 0; i < length; ++i, ++inPixel32)
            {
                *outPixel16++ = 
                ((((*inPixel32 >>  0) & 0xFF) >> 3) << 11) |  // R
                ((((*inPixel32 >>  8) & 0xFF) >> 2) << 5)  |  // G
                ((((*inPixel32 >> 16) & 0xFF) >> 3) << 0);    // B
            }
        }
        else 
        {
            // Convert "RRRRRRRRRGGGGGGGGBBBBBBBB" to "RRRRRGGGGGGBBBBB"
            
            tempData = new unsigned char[width * height * 2];
            outPixel16 = (unsigned short*)tempData;
            inPixel8 = (unsigned char*)image->getData();
            
            for(unsigned int i = 0; i < length; ++i)
            {
                *outPixel16++ = 
                (((*inPixel8++ & 0xFF) >> 3) << 11) |  // R
                (((*inPixel8++ & 0xFF) >> 2) << 5)  |  // G
                (((*inPixel8++ & 0xFF) >> 3) << 0);    // B
            }
        }    
    }
    else if (pixelFormat == Texture2D::PixelFormat::RGBA4444)
    {
        // Convert "RRRRRRRRRGGGGGGGGBBBBBBBBAAAAAAAA" to "RRRRGGGGBBBBAAAA"
        
        inPixel32 = (unsigned int*)image->getData();  
        tempData = new unsigned char[width * height * 2];
        outPixel16 = (unsigned short*)tempData;
        
        for(unsigned int i = 0; i < length; ++i, ++inPixel32)
        {
            *outPixel16++ = 
            ((((*inPixel32 >> 0) & 0xFF) >> 4) << 12) | // R
            ((((*inPixel32 >> 8) & 0xFF) >> 4) <<  8) | // G
            ((((*inPixel32 >> 16) & 0xFF) >> 4) << 4) | // B
            ((((*inPixel32 >> 24) & 0xFF) >> 4) << 0);  // A
        }
    }
    else if (pixelFormat == Texture2D::PixelFormat::RGB5A1)
    {
        // Convert "RRRRRRRRRGGGGGGGGBBBBBBBBAAAAAAAA" to "RRRRRGGGGGBBBBBA"
        inPixel32 = (unsigned int*)image->getData();   
        tempData = new unsigned char[width * height * 2];
        outPixel16 = (unsigned short*)tempData;
        
        for(unsigned int i = 0; i < length; ++i, ++inPixel32)
        {
            *outPixel16++ = 
            ((((*inPixel32 >> 0) & 0xFF) >> 3) << 11) | // R
            ((((*inPixel32 >> 8) & 0xFF) >> 3) <<  6) | // G
            ((((*inPixel32 >> 16) & 0xFF) >> 3) << 1) | // B
            ((((*inPixel32 >> 24) & 0xFF) >> 7) << 0);  // A
        }
    }
    else if (pixelFormat == Texture2D::PixelFormat::A8)
    {
        // Convert "RRRRRRRRRGGGGGGGGBBBBBBBBAAAAAAAA" to "AAAAAAAA"
        inPixel32 = (unsigned int*)image->getData();
        tempData = new unsigned char[width * height];
        unsigned char *outPixel8 = tempData;
        
        for(unsigned int i = 0; i < length; ++i, ++inPixel32)
        {
            *outPixel8++ = (*inPixel32 >> 24) & 0xFF;  // A
        }
    }
    
    if (hasAlpha && pixelFormat == Texture2D::PixelFormat::RGB888)
    {
        // Convert "RRRRRRRRRGGGGGGGGBBBBBBBBAAAAAAAA" to "RRRRRRRRGGGGGGGGBBBBBBBB"
        inPixel32 = (unsigned int*)image->getData();
        tempData = new unsigned char[width * height * 3];
        unsigned char *outPixel8 = tempData;
        
        for(unsigned int i = 0; i < length; ++i, ++inPixel32)
        {
            *outPixel8++ = (*inPixel32 >> 0) & 0xFF; // R
            *outPixel8++ = (*inPixel32 >> 8) & 0xFF; // G
            *outPixel8++ = (*inPixel32 >> 16) & 0xFF; // B
        }
    }
    
    initWithData(tempData, pixelFormat, width, height, imageSize);
    
    if (tempData != image->getData())
    {
        delete [] tempData;
    }

    _hasPremultipliedAlpha = image->isPremultipliedAlpha();
    return true;
}

// implementation Texture2D (Text)
bool Texture2D::initWithString(const char *text, const char *fontName, float fontSize, const Size& dimensions/* = Size(0, 0)*/, Label::HAlignment hAlignment/* =  Label::HAlignment::CENTER */, Label::VAlignment vAlignment/* =  Label::VAlignment::TOP */)
{
    FontDefinition tempDef;
    
    tempDef._shadow._shadowEnabled = false;
    tempDef._stroke._strokeEnabled = false;
   
    
    tempDef._fontName      = std::string(fontName);
    tempDef._fontSize      = fontSize;
    tempDef._dimensions    = dimensions;
    tempDef._alignment     = hAlignment;
    tempDef._vertAlignment = vAlignment;
    tempDef._fontFillColor = Color3B::WHITE;

    return initWithString(text, tempDef);
}

bool Texture2D::initWithString(const char *text, const FontDefinition& textDefinition)
{
#if CC_ENABLE_CACHE_TEXTURE_DATA
    // cache the texture data
    VolatileTexture::addStringTexture(this, text, textDefinition);
#endif

    bool bRet = false;
    Image::ETextAlign eAlign;
    
    if (Label::VAlignment::TOP == textDefinition._vertAlignment)
    {
        eAlign = (Label::HAlignment::CENTER == textDefinition._alignment) ? Image::kAlignTop
        : (Label::HAlignment::LEFT == textDefinition._alignment) ? Image::kAlignTopLeft : Image::kAlignTopRight;
    }
    else if (Label::VAlignment::CENTER == textDefinition._vertAlignment)
    {
        eAlign = (Label::HAlignment::CENTER == textDefinition._alignment) ? Image::kAlignCenter
        : (Label::HAlignment::LEFT == textDefinition._alignment) ? Image::kAlignLeft : Image::kAlignRight;
    }
    else if (Label::VAlignment::BOTTOM == textDefinition._vertAlignment)
    {
        eAlign = (Label::HAlignment::CENTER == textDefinition._alignment) ? Image::kAlignBottom
        : (Label::HAlignment::LEFT == textDefinition._alignment) ? Image::kAlignBottomLeft : Image::kAlignBottomRight;
    }
    else
    {
        CCASSERT(false, "Not supported alignment format!");
        return false;
    }
    
#if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID) || (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)

    // handle shadow parameters
    bool  shadowEnabled = false;
    float shadowDX      = 0.0f;
    float shadowDY      = 0.0f;
    float shadowBlur    = 0.0f;
    float shadowOpacity = 0.0f;
    
    if ( textDefinition._shadow._shadowEnabled )
    {
        shadowEnabled =  true;
        shadowDX      = textDefinition._shadow._shadowOffset.width;
        shadowDY      = textDefinition._shadow._shadowOffset.height;
        shadowBlur    = textDefinition._shadow._shadowBlur;
        shadowOpacity = textDefinition._shadow._shadowOpacity;
    }
    
    // handle stroke parameters
    bool strokeEnabled = false;
    float strokeColorR = 0.0f;
    float strokeColorG = 0.0f;
    float strokeColorB = 0.0f;
    float strokeSize   = 0.0f;
    
    if ( textDefinition._stroke._strokeEnabled )
    {
        strokeEnabled = true;
        strokeColorR = textDefinition._stroke._strokeColor.r / 255.0f;
        strokeColorG = textDefinition._stroke._strokeColor.g / 255.0f;
        strokeColorB = textDefinition._stroke._strokeColor.b / 255.0f;
        strokeSize   = textDefinition._stroke._strokeSize;
    }
    
    Image* pImage = new Image();
    do
    {
        CC_BREAK_IF(NULL == pImage);
        
        bRet = pImage->initWithStringShadowStroke(text,
                                                  (int)textDefinition._dimensions.width,
                                                  (int)textDefinition._dimensions.height,
                                                  eAlign,
                                                  textDefinition._fontName.c_str(),
                                                  textDefinition._fontSize,
                                                  textDefinition._fontFillColor.r / 255.0f,
                                                  textDefinition._fontFillColor.g / 255.0f,
                                                  textDefinition._fontFillColor.b / 255.0f,
                                                  shadowEnabled,
                                                  shadowDX,
                                                  shadowDY,
                                                  shadowOpacity,
                                                  shadowBlur,
                                                  strokeEnabled,
                                                  strokeColorR,
                                                  strokeColorG,
                                                  strokeColorB,
                                                  strokeSize);
        
        
        CC_BREAK_IF(!bRet);
        bRet = initWithImage(pImage);
        
    } while (0);
    
    CC_SAFE_RELEASE(pImage);
    
    return bRet;

#else
    bool requestUnsupported = textDefinition._shadow._shadowEnabled || textDefinition._stroke._strokeEnabled;

    CCASSERT(requestUnsupported == false, "Currently shadow and stroke only supported on iOS and Android!");

    Image* pImage = new Image();
    do
    {
        CC_BREAK_IF(NULL == pImage);
        bRet = pImage->initWithString(text, (int)textDefinition._dimensions.width, (int)textDefinition._dimensions.height, eAlign, textDefinition._fontName.c_str(), (int)textDefinition._fontSize);
        CC_BREAK_IF(!bRet);
        bRet = initWithImage(pImage);
    } while (0);
    
    CC_SAFE_RELEASE(pImage);

    return bRet;    
#endif
}


// implementation Texture2D (Drawing)

void Texture2D::drawAtPoint(const Point& point)
{
    GLfloat    coordinates[] = {
        0.0f,    _maxT,
        _maxS,_maxT,
        0.0f,    0.0f,
        _maxS,0.0f };

    GLfloat    width = (GLfloat)_pixelsWide * _maxS,
        height = (GLfloat)_pixelsHigh * _maxT;

    GLfloat        vertices[] = {    
        point.x,            point.y,
        width + point.x,    point.y,
        point.x,            height  + point.y,
        width + point.x,    height  + point.y };

    ccGLEnableVertexAttribs( VERTEX_ATTRIB_FLAG_POSITION | VERTEX_ATTRIB_FLAG_TEX_COORDS );
    _shaderProgram->use();
    _shaderProgram->setUniformsForBuiltins();

    ccGLBindTexture2D( _name );


#ifdef EMSCRIPTEN
    setGLBufferData(vertices, 8 * sizeof(GLfloat), 0);
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, 0);

    setGLBufferData(coordinates, 8 * sizeof(GLfloat), 1);
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_TEX_COORDS, 2, GL_FLOAT, GL_FALSE, 0, 0);
#else
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, vertices);
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_TEX_COORDS, 2, GL_FLOAT, GL_FALSE, 0, coordinates);
#endif // EMSCRIPTEN

    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
}

void Texture2D::drawInRect(const Rect& rect)
{
    GLfloat    coordinates[] = {    
        0.0f,    _maxT,
        _maxS,_maxT,
        0.0f,    0.0f,
        _maxS,0.0f };

    GLfloat    vertices[] = {    rect.origin.x,        rect.origin.y,                            /*0.0f,*/
        rect.origin.x + rect.size.width,        rect.origin.y,                            /*0.0f,*/
        rect.origin.x,                            rect.origin.y + rect.size.height,        /*0.0f,*/
        rect.origin.x + rect.size.width,        rect.origin.y + rect.size.height,        /*0.0f*/ };

    ccGLEnableVertexAttribs( VERTEX_ATTRIB_FLAG_POSITION | VERTEX_ATTRIB_FLAG_TEX_COORDS );
    _shaderProgram->use();
    _shaderProgram->setUniformsForBuiltins();

    ccGLBindTexture2D( _name );

#ifdef EMSCRIPTEN
    setGLBufferData(vertices, 8 * sizeof(GLfloat), 0);
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, 0);

    setGLBufferData(coordinates, 8 * sizeof(GLfloat), 1);
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_TEX_COORDS, 2, GL_FLOAT, GL_FALSE, 0, 0);
#else
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION, 2, GL_FLOAT, GL_FALSE, 0, vertices);
    glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_TEX_COORDS, 2, GL_FLOAT, GL_FALSE, 0, coordinates);
#endif // EMSCRIPTEN
    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
}

bool Texture2D::initWithPVRFile(const char* file)
{
    bool bRet = false;
    // nothing to do with Object::init
    
    TexturePVR *pvr = new TexturePVR;
    bRet = pvr->initWithContentsOfFile(file);
        
    if (bRet)
    {
        pvr->setRetainName(true); // don't dealloc texture on release
        
        _name = pvr->getName();
        _maxS = 1.0f;
        _maxT = 1.0f;
        _pixelsWide = pvr->getWidth();
        _pixelsHigh = pvr->getHeight();
        _contentSize = Size((float)_pixelsWide, (float)_pixelsHigh);
        _hasPremultipliedAlpha = (pvr->isForcePremultipliedAlpha()) ? pvr->hasPremultipliedAlpha() : _PVRHaveAlphaPremultiplied;
        _pixelFormat = pvr->getFormat();
        _hasMipmaps = pvr->getNumberOfMipmaps() > 1;       

        pvr->release();
    }
    else
    {
        CCLOG("cocos2d: Couldn't load PVR image %s", file);
    }

    return bRet;
}

bool Texture2D::initWithETCFile(const char* file)
{
    bool bRet = false;
    // nothing to do with Object::init
    
    TextureETC *etc = new TextureETC;
    bRet = etc->initWithFile(file);
    
    if (bRet)
    {
        _name = etc->getName();
        _maxS = 1.0f;
        _maxT = 1.0f;
        _pixelsWide = etc->getWidth();
        _pixelsHigh = etc->getHeight();
        _contentSize = Size((float)_pixelsWide, (float)_pixelsHigh);
        _hasPremultipliedAlpha = true;
        
        etc->release();
    }
    else
    {
        CCLOG("cocos2d: Couldn't load ETC image %s", file);
    }
    
    return bRet;
}

void Texture2D::PVRImagesHavePremultipliedAlpha(bool haveAlphaPremultiplied)
{
    PVRHaveAlphaPremultiplied_ = haveAlphaPremultiplied;
}

    
//
// Use to apply MIN/MAG filter
//
// implementation Texture2D (GLFilter)

void Texture2D::generateMipmap()
{
    CCASSERT( _pixelsWide == ccNextPOT(_pixelsWide) && _pixelsHigh == ccNextPOT(_pixelsHigh), "Mipmap texture only works in POT textures");
    ccGLBindTexture2D( _name );
    glGenerateMipmap(GL_TEXTURE_2D);
    _hasMipmaps = true;
}

bool Texture2D::hasMipmaps() const
{
    return _hasMipmaps;
}

void Texture2D::setTexParameters(const ccTexParams &texParams)
{
    CCASSERT( (_pixelsWide == ccNextPOT(_pixelsWide) || texParams.wrapS == GL_CLAMP_TO_EDGE) &&
        (_pixelsHigh == ccNextPOT(_pixelsHigh) || texParams.wrapT == GL_CLAMP_TO_EDGE),
        "GL_CLAMP_TO_EDGE should be used in NPOT dimensions");

    ccGLBindTexture2D( _name );
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, texParams.minFilter );
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, texParams.magFilter );
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, texParams.wrapS );
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, texParams.wrapT );

#if CC_ENABLE_CACHE_TEXTURE_DATA
    VolatileTexture::setTexParameters(this, texParams);
#endif
}

void Texture2D::setAliasTexParameters()
{
    ccGLBindTexture2D( _name );

    if( ! _hasMipmaps )
    {
        glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
    }
    else
    {
        glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST );
    }

    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
#if CC_ENABLE_CACHE_TEXTURE_DATA
    ccTexParams texParams = {(GLuint)(_hasMipmaps?GL_NEAREST_MIPMAP_NEAREST:GL_NEAREST),GL_NEAREST,GL_NONE,GL_NONE};
    VolatileTexture::setTexParameters(this, texParams);
#endif
}

void Texture2D::setAntiAliasTexParameters()
{
    ccGLBindTexture2D( _name );

    if( ! _hasMipmaps )
    {
        glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
    }
    else
    {
        glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST );
    }

    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
#if CC_ENABLE_CACHE_TEXTURE_DATA
    ccTexParams texParams = {(GLuint)(_hasMipmaps?GL_LINEAR_MIPMAP_NEAREST:GL_LINEAR),GL_LINEAR,GL_NONE,GL_NONE};
    VolatileTexture::setTexParameters(this, texParams);
#endif
}

const char* Texture2D::getStringForFormat() const
{
	switch (_pixelFormat) 
	{
		case Texture2D::PixelFormat::RGBA8888:
			return  "RGBA8888";

		case Texture2D::PixelFormat::RGB888:
			return  "RGB888";

		case Texture2D::PixelFormat::RGB565:
			return  "RGB565";

		case Texture2D::PixelFormat::RGBA4444:
			return  "RGBA4444";

		case Texture2D::PixelFormat::RGB5A1:
			return  "RGB5A1";

		case Texture2D::PixelFormat::AI88:
			return  "AI88";

		case Texture2D::PixelFormat::A8:
			return  "A8";

		case Texture2D::PixelFormat::I8:
			return  "I8";

		case Texture2D::PixelFormat::PRVTC4:
			return  "PVRTC4";

		case Texture2D::PixelFormat::PRVTC2:
			return  "PVRTC2";

		default:
			CCASSERT(false , "unrecognized pixel format");
			CCLOG("stringForFormat: %ld, cannot give useful result", (long)_pixelFormat);
			break;
	}

	return  NULL;
}

//
// Texture options for images that contains alpha
//
// implementation Texture2D (PixelFormat)

void Texture2D::setDefaultAlphaPixelFormat(Texture2D::PixelFormat format)
{
    g_defaultAlphaPixelFormat = format;
}

Texture2D::PixelFormat Texture2D::getDefaultAlphaPixelFormat()
{
    return g_defaultAlphaPixelFormat;
}

unsigned int Texture2D::getBitsPerPixelForFormat(Texture2D::PixelFormat format) const
{
	unsigned int ret=0;

	switch (format) {
		case Texture2D::PixelFormat::RGBA8888:
			ret = 32;
			break;
		case Texture2D::PixelFormat::RGB888:
			// It is 32 and not 24, since its internal representation uses 32 bits.
			ret = 32;
			break;
		case Texture2D::PixelFormat::RGB565:
			ret = 16;
			break;
		case Texture2D::PixelFormat::RGBA4444:
			ret = 16;
			break;
		case Texture2D::PixelFormat::RGB5A1:
			ret = 16;
			break;
		case Texture2D::PixelFormat::AI88:
			ret = 16;
			break;
		case Texture2D::PixelFormat::A8:
			ret = 8;
			break;
		case Texture2D::PixelFormat::I8:
			ret = 8;
			break;
		case Texture2D::PixelFormat::PRVTC4:
			ret = 4;
			break;
		case Texture2D::PixelFormat::PRVTC2:
			ret = 2;
			break;
		default:
			ret = -1;
			CCASSERT(false , "unrecognized pixel format");
			CCLOG("bitsPerPixelForFormat: %ld, cannot give useful result", (long)format);
			break;
	}
	return ret;
}

unsigned int Texture2D::getBitsPerPixelForFormat() const
{
	return this->getBitsPerPixelForFormat(_pixelFormat);
}


NS_CC_END