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Copyright (c) 2008      Apple Inc. All Rights Reserved.

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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/platform.h"
#include "CCImage.h"
#include "CCGL.h"
#include "support/ccUtils.h"
#include "platform/CCPlatformMacros.h"
#include "CCTexturePVR.h"
#include "CCDirector.h"
#include "CCGLProgram.h"
#include "ccGLStateCache.h"
#include "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 CCTexture2DPixelFormat g_defaultAlphaPixelFormat = kCCTexture2DPixelFormat_Default;

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

CCTexture2D::CCTexture2D()
: m_uPixelsWide(0)
, m_uPixelsHigh(0)
, m_uName(0)
, m_fMaxS(0.0)
, m_fMaxT(0.0)
, m_bHasPremultipliedAlpha(false)
, m_bHasMipmaps(false)
, m_bPVRHaveAlphaPremultiplied(true)
, m_pShaderProgram(NULL)
{
}

CCTexture2D::~CCTexture2D()
{
#if CC_ENABLE_CACHE_TEXTURE_DATA
    VolatileTexture::removeTexture(this);
#endif

    CCLOGINFO("cocos2d: deallocing CCTexture2D %u.", m_uName);
    CC_SAFE_RELEASE(m_pShaderProgram);

    if(m_uName)
    {
        ccGLDeleteTexture(m_uName);
    }
}

CCTexture2DPixelFormat CCTexture2D::getPixelFormat()
{
    return m_ePixelFormat;
}

unsigned int CCTexture2D::getPixelsWide()
{
    return m_uPixelsWide;
}

unsigned int CCTexture2D::getPixelsHigh()
{
    return m_uPixelsHigh;
}

GLuint CCTexture2D::getName()
{
    return m_uName;
}

CCSize CCTexture2D::getContentSize()
{

    CCSize ret;
    ret.width = m_tContentSize.width / CC_CONTENT_SCALE_FACTOR();
    ret.height = m_tContentSize.height / CC_CONTENT_SCALE_FACTOR();
    
    return ret;
}

const CCSize& CCTexture2D::getContentSizeInPixels()
{
    return m_tContentSize;
}

GLfloat CCTexture2D::getMaxS()
{
    return m_fMaxS;
}

void CCTexture2D::setMaxS(GLfloat maxS)
{
    m_fMaxS = maxS;
}

GLfloat CCTexture2D::getMaxT()
{
    return m_fMaxT;
}

void CCTexture2D::setMaxT(GLfloat maxT)
{
    m_fMaxT = maxT;
}

CCGLProgram* CCTexture2D::getShaderProgram(void)
{
    return m_pShaderProgram;
}

void CCTexture2D::setShaderProgram(CCGLProgram* pShaderProgram)
{
    CC_SAFE_RETAIN(pShaderProgram);
    CC_SAFE_RELEASE(m_pShaderProgram);
    m_pShaderProgram = pShaderProgram;
}

void CCTexture2D::releaseData(void *data)
{
    free(data);
}

void* CCTexture2D::keepData(void *data, unsigned int length)
{
    CC_UNUSED_PARAM(length);
    //The texture data mustn't be saved becuase it isn't a mutable texture.
    return data;
}

bool CCTexture2D::hasPremultipliedAlpha()
{
    return m_bHasPremultipliedAlpha;
}

bool CCTexture2D::initWithData(const void *data, CCTexture2DPixelFormat pixelFormat, unsigned int pixelsWide, unsigned int pixelsHigh, const CCSize& contentSize)
{
    // XXX: 32 bits or POT textures uses UNPACK of 4 (is this correct ??? )
    if( pixelFormat == kCCTexture2DPixelFormat_RGBA8888 || ( ccNextPOT(pixelsWide)==pixelsWide && ccNextPOT(pixelsHigh)==pixelsHigh) )
    {
        glPixelStorei(GL_UNPACK_ALIGNMENT,4);
    }
    else
    {
        glPixelStorei(GL_UNPACK_ALIGNMENT,1);
    }

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

    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 kCCTexture2DPixelFormat_RGBA8888:
        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, (GLsizei)pixelsWide, (GLsizei)pixelsHigh, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
        break;
    case kCCTexture2DPixelFormat_RGB888:
        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, (GLsizei)pixelsWide, (GLsizei)pixelsHigh, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
        break;
    case kCCTexture2DPixelFormat_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 kCCTexture2DPixelFormat_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 kCCTexture2DPixelFormat_RGB565:
        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, (GLsizei)pixelsWide, (GLsizei)pixelsHigh, 0, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, data);
        break;
    case kCCTexture2DPixelFormat_AI88:
        glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE_ALPHA, (GLsizei)pixelsWide, (GLsizei)pixelsHigh, 0, GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, data);
        break;
    case kCCTexture2DPixelFormat_A8:
        glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, (GLsizei)pixelsWide, (GLsizei)pixelsHigh, 0, GL_ALPHA, GL_UNSIGNED_BYTE, data);
        break;
    case kCCTexture2DPixelFormat_I8:
        glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, (GLsizei)pixelsWide, (GLsizei)pixelsHigh, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, data);
        break;
    default:
        CCAssert(0, "NSInternalInconsistencyException");

    }

    m_tContentSize = contentSize;
    m_uPixelsWide = pixelsWide;
    m_uPixelsHigh = pixelsHigh;
    m_ePixelFormat = pixelFormat;
    m_fMaxS = contentSize.width / (float)(pixelsWide);
    m_fMaxT = contentSize.height / (float)(pixelsHigh);

    m_bHasPremultipliedAlpha = false;
    m_bHasMipmaps = false;

    m_eResolutionType = kCCResolutionUnknown;
    setShaderProgram(CCShaderCache::sharedShaderCache()->programForKey(kCCShader_PositionTexture));

    return true;
}


const char* CCTexture2D::description(void)
{
    return CCString::createWithFormat("<CCTexture2D | Name = %u | Dimensions = %u x %u | Coordinates = (%.2f, %.2f)>", m_uName, m_uPixelsWide, m_uPixelsHigh, m_fMaxS, m_fMaxT)->getCString();
}

// implementation CCTexture2D (Image)

bool CCTexture2D::initWithImage(CCImage *uiImage)
{
    return initWithImage(uiImage, kCCResolutionUnknown);
}

bool CCTexture2D::initWithImage(CCImage * uiImage, ccResolutionType resolution)
{
    if (uiImage == NULL)
    {
        CCLOG("cocos2d: CCTexture2D. Can't create Texture. UIImage is nil");
        this->release();
        return false;
    }
    
    unsigned int imageWidth = uiImage->getWidth();
    unsigned int imageHeight = uiImage->getHeight();
    
    CCConfiguration *conf = CCConfiguration::sharedConfiguration();

    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);
        this->release();
        return NULL;
    }

    m_eResolutionType = resolution;

    // always load premultiplied images
    return initPremultipliedATextureWithImage(uiImage, imageWidth, imageHeight);
}
bool CCTexture2D::initPremultipliedATextureWithImage(CCImage *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();
    CCSize                    imageSize = CCSizeMake((float)(image->getWidth()), (float)(image->getHeight()));
    CCTexture2DPixelFormat    pixelFormat;
    size_t                    bpp = image->getBitsPerComponent();

    // compute pixel format
    if(hasAlpha)
    {
        pixelFormat = g_defaultAlphaPixelFormat;
    }
    else
    {
        if (bpp >= 8)
        {
            pixelFormat = kCCTexture2DPixelFormat_RGB888;
        }
        else 
        {
            pixelFormat = kCCTexture2DPixelFormat_RGB565;
        }
        
    }
    
    // Repack the pixel data into the right format
    unsigned int length = width * height;
    
    if (pixelFormat == kCCTexture2DPixelFormat_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 == kCCTexture2DPixelFormat_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 == kCCTexture2DPixelFormat_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 == kCCTexture2DPixelFormat_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 == kCCTexture2DPixelFormat_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;
    }

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

// implementation CCTexture2D (Text)
bool CCTexture2D::initWithString(const char *text, const char *fontName, float fontSize)
{
    return initWithString(text, CCSizeMake(0,0), kCCTextAlignmentCenter, kCCVerticalTextAlignmentTop, fontName, fontSize);
}

bool CCTexture2D::initWithString(const char *text, const CCSize& dimensions, CCTextAlignment hAlignment, CCVerticalTextAlignment vAlignment, const char *fontName, float fontSize)
{
#if CC_ENABLE_CACHE_TEXTURE_DATA
    // cache the texture data
    VolatileTexture::addStringTexture(this, text, dimensions, hAlignment, vAlignment, fontName, fontSize);
#endif

    CCImage image;

    CCImage::ETextAlign eAlign;

    if (kCCVerticalTextAlignmentTop == vAlignment)
    {
        eAlign = (kCCTextAlignmentCenter == hAlignment) ? CCImage::kAlignTop
            : (kCCTextAlignmentLeft == hAlignment) ? CCImage::kAlignTopLeft : CCImage::kAlignTopRight;
    }
    else if (kCCVerticalTextAlignmentCenter == vAlignment)
    {
        eAlign = (kCCTextAlignmentCenter == hAlignment) ? CCImage::kAlignCenter
            : (kCCTextAlignmentLeft == hAlignment) ? CCImage::kAlignLeft : CCImage::kAlignRight;
    }
    else if (kCCVerticalTextAlignmentBottom == vAlignment)
    {
        eAlign = (kCCTextAlignmentCenter == hAlignment) ? CCImage::kAlignBottom
            : (kCCTextAlignmentLeft == hAlignment) ? CCImage::kAlignBottomLeft : CCImage::kAlignBottomRight;
    }
    else
    {
        CCAssert(false, "Not supported alignment format!");
    }
    
    if (!image.initWithString(text, (int)dimensions.width, (int)dimensions.height, eAlign, fontName, (int)fontSize))
    {
        return false;
    }

    return initWithImage(&image);
}


// implementation CCTexture2D (Drawing)

void CCTexture2D::drawAtPoint(const CCPoint& point)
{
    GLfloat    coordinates[] = {    
        0.0f,    m_fMaxT,
        m_fMaxS,m_fMaxT,
        0.0f,    0.0f,
        m_fMaxS,0.0f };

    GLfloat    width = (GLfloat)m_uPixelsWide * m_fMaxS,
        height = (GLfloat)m_uPixelsHigh * m_fMaxT;

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

    ccGLEnableVertexAttribs( kCCVertexAttribFlag_Position | kCCVertexAttribFlag_TexCoords );
    m_pShaderProgram->use();
    m_pShaderProgram->setUniformForModelViewProjectionMatrix();

    ccGLBindTexture2D( m_uName );


    glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, vertices);
    glVertexAttribPointer(kCCVertexAttrib_TexCoords, 2, GL_FLOAT, GL_FALSE, 0, coordinates);

    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
}

void CCTexture2D::drawInRect(const CCRect& rect)
{
    GLfloat    coordinates[] = {    
        0.0f,    m_fMaxT,
        m_fMaxS,m_fMaxT,
        0.0f,    0.0f,
        m_fMaxS,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( kCCVertexAttribFlag_Position | kCCVertexAttribFlag_TexCoords );
    m_pShaderProgram->use();
    m_pShaderProgram->setUniformForModelViewProjectionMatrix();

    ccGLBindTexture2D( m_uName );

    glVertexAttribPointer(kCCVertexAttrib_Position, 2, GL_FLOAT, GL_FALSE, 0, vertices);
    glVertexAttribPointer(kCCVertexAttrib_TexCoords, 2, GL_FLOAT, GL_FALSE, 0, coordinates);
    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
}

#ifdef CC_SUPPORT_PVRTC
// implementation CCTexture2D (PVRTC);    
bool CCTexture2D::initWithPVRTCData(const void *data, int level, int bpp, bool hasAlpha, int length, CCTexture2DPixelFormat pixelFormat)
{
    if( !(CCConfiguration::sharedConfiguration()->supportsPVRTC()) )
    {
        CCLOG("cocos2d: WARNING: PVRTC images is not supported.");
        this->release();
        return false;
    }

    glGenTextures(1, &m_uName);
    glBindTexture(GL_TEXTURE_2D, m_uName);

    this->setAntiAliasTexParameters();

    GLenum format;
    GLsizei size = length * length * bpp / 8;
    if(hasAlpha) {
        format = (bpp == 4) ? GL_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG : GL_COMPRESSED_RGBA_PVRTC_2BPPV1_IMG;
    } else {
        format = (bpp == 4) ? GL_COMPRESSED_RGB_PVRTC_4BPPV1_IMG : GL_COMPRESSED_RGB_PVRTC_2BPPV1_IMG;
    }
    if(size < 32) {
        size = 32;
    }
    glCompressedTexImage2D(GL_TEXTURE_2D, level, format, length, length, 0, size, data);

    m_tContentSize = CCSizeMake((float)(length), (float)(length));
    m_uPixelsWide = length;
    m_uPixelsHigh = length;
    m_fMaxS = 1.0f;
    m_fMaxT = 1.0f;
    m_bHasPremultipliedAlpha = PVRHaveAlphaPremultiplied_;
    m_ePixelFormat = pixelFormat;

    return true;
}
#endif // CC_SUPPORT_PVRTC

bool CCTexture2D::initWithPVRFile(const char* file)
{
    bool bRet = false;
    // nothing to do with CCObject::init
    
    CCTexturePVR *pvr = new CCTexturePVR;
    bRet = pvr->initWithContentsOfFile(file);
        
    if (bRet)
    {
        pvr->setRetainName(true); // don't dealloc texture on release
        
        m_uName = pvr->getName();
        m_fMaxS = 1.0f;
        m_fMaxT = 1.0f;
        m_uPixelsWide = pvr->getWidth();
        m_uPixelsHigh = pvr->getHeight();
        m_tContentSize = CCSizeMake((float)m_uPixelsWide, (float)m_uPixelsHigh);
        m_bHasPremultipliedAlpha = PVRHaveAlphaPremultiplied_;
        m_ePixelFormat = pvr->getFormat();
        m_bHasMipmaps = pvr->getNumberOfMipmaps() > 1;       

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

    return bRet;
}

void CCTexture2D::PVRImagesHavePremultipliedAlpha(bool haveAlphaPremultiplied)
{
    PVRHaveAlphaPremultiplied_ = haveAlphaPremultiplied;
}

    
//
// Use to apply MIN/MAG filter
//
// implementation CCTexture2D (GLFilter)

void CCTexture2D::generateMipmap()
{
    CCAssert( m_uPixelsWide == ccNextPOT(m_uPixelsWide) && m_uPixelsHigh == ccNextPOT(m_uPixelsHigh), "Mimpap texture only works in POT textures");
    ccGLBindTexture2D( m_uName );
    glGenerateMipmap(GL_TEXTURE_2D);
    m_bHasMipmaps = true;
}

bool CCTexture2D::hasMipmaps()
{
    return m_bHasMipmaps;
}

void CCTexture2D::setTexParameters(ccTexParams *texParams)
{
    CCAssert( (m_uPixelsWide == ccNextPOT(m_uPixelsWide) || texParams->wrapS == GL_CLAMP_TO_EDGE) &&
        (m_uPixelsHigh == ccNextPOT(m_uPixelsHigh) || texParams->wrapT == GL_CLAMP_TO_EDGE),
        "GL_CLAMP_TO_EDGE should be used in NPOT dimensions");

    ccGLBindTexture2D( m_uName );
    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 );
}

void CCTexture2D::setAliasTexParameters()
{
    ccGLBindTexture2D( m_uName );

    if( ! m_bHasMipmaps )
    {
        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 );
}

void CCTexture2D::setAntiAliasTexParameters()
{
    ccGLBindTexture2D( m_uName );

    if( ! m_bHasMipmaps )
    {
        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 );
}

const char* CCTexture2D::stringForFormat()
{
	switch (m_ePixelFormat) 
	{
		case kCCTexture2DPixelFormat_RGBA8888:
			return  "RGBA8888";

		case kCCTexture2DPixelFormat_RGB888:
			return  "RGB888";

		case kCCTexture2DPixelFormat_RGB565:
			return  "RGB565";

		case kCCTexture2DPixelFormat_RGBA4444:
			return  "RGBA4444";

		case kCCTexture2DPixelFormat_RGB5A1:
			return  "RGB5A1";

		case kCCTexture2DPixelFormat_AI88:
			return  "AI88";

		case kCCTexture2DPixelFormat_A8:
			return  "A8";

		case kCCTexture2DPixelFormat_I8:
			return  "I8";

		case kCCTexture2DPixelFormat_PVRTC4:
			return  "PVRTC4";

		case kCCTexture2DPixelFormat_PVRTC2:
			return  "PVRTC2";

		default:
			CCAssert(false , "unrecognised pixel format");
			CCLOG("stringForFormat: %ld, cannot give useful result", (long)m_ePixelFormat);
			break;
	}

	return  NULL;
}


//
// Texture options for images that contains alpha
//
// implementation CCTexture2D (PixelFormat)

void CCTexture2D::setDefaultAlphaPixelFormat(CCTexture2DPixelFormat format)
{
    g_defaultAlphaPixelFormat = format;
}


CCTexture2DPixelFormat CCTexture2D::defaultAlphaPixelFormat()
{
    return g_defaultAlphaPixelFormat;
}

unsigned int CCTexture2D::bitsPerPixelForFormat(CCTexture2DPixelFormat format)
{
	unsigned int ret=0;

	switch (format) {
		case kCCTexture2DPixelFormat_RGBA8888:
			ret = 32;
			break;
		case kCCTexture2DPixelFormat_RGB888:
			// It is 32 and not 24, since its internal representation uses 32 bits.
			ret = 32;
			break;
		case kCCTexture2DPixelFormat_RGB565:
			ret = 16;
			break;
		case kCCTexture2DPixelFormat_RGBA4444:
			ret = 16;
			break;
		case kCCTexture2DPixelFormat_RGB5A1:
			ret = 16;
			break;
		case kCCTexture2DPixelFormat_AI88:
			ret = 16;
			break;
		case kCCTexture2DPixelFormat_A8:
			ret = 8;
			break;
		case kCCTexture2DPixelFormat_I8:
			ret = 8;
			break;
		case kCCTexture2DPixelFormat_PVRTC4:
			ret = 4;
			break;
		case kCCTexture2DPixelFormat_PVRTC2:
			ret = 2;
			break;
		default:
			ret = -1;
			CCAssert(false , "unrecognised pixel format");
			CCLOG("bitsPerPixelForFormat: %ld, cannot give useful result", (long)format);
			break;
	}
	return ret;
}

unsigned int CCTexture2D::bitsPerPixelForFormat()
{
	return this->bitsPerPixelForFormat(m_ePixelFormat);
}


NS_CC_END