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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"

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

namespace   cocos2d {

#if CC_FONT_LABEL_SUPPORT
// FontLabel support
#endif// CC_FONT_LABEL_SUPPORT

//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;

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

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

    CCLOGINFO("cocos2d: deallocing CCTexture2D %u.", m_uName);
    if(m_uName)
    {
        glDeleteTextures(1, &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;
}

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

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;
}

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;
}

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::getHasPremultipliedAlpha()
{
    return m_bHasPremultipliedAlpha;
}

bool CCTexture2D::initWithData(const void *data, CCTexture2DPixelFormat pixelFormat, unsigned int pixelsWide, unsigned int pixelsHigh, const CCSize& contentSize)
{
    glPixelStorei(GL_UNPACK_ALIGNMENT,1);
    glGenTextures(1, &m_uName);
    glBindTexture(GL_TEXTURE_2D, m_uName);

    this->setAntiAliasTexParameters();

    // 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;
    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;

    return true;
}


char * CCTexture2D::description(void)
{
    char *ret = new char[100];
    sprintf(ret, "<CCTexture2D | Name = %u | Dimensions = %u x %u | Coordinates = (%.2f, %.2f)>", m_uName, m_uPixelsWide, m_uPixelsHigh, m_fMaxS, m_fMaxT);
    return ret;
}

// implementation CCTexture2D (Image)

bool CCTexture2D::initWithImage(CCImage * uiImage)
{
    unsigned int POTWide, POTHigh;

    if(uiImage == NULL)
    {
        CCLOG("cocos2d: CCTexture2D. Can't create Texture. UIImage is nil");
        this->release();
        return false;
    }

    CCConfiguration *conf = CCConfiguration::sharedConfiguration();

#if CC_TEXTURE_NPOT_SUPPORT
    if( conf->isSupportsNPOT() )
    {
		POTWide = uiImage->getWidth();
		POTHigh = uiImage->getHeight();
    }
    else
#endif
    {
        POTWide = ccNextPOT(uiImage->getWidth());
        POTHigh = ccNextPOT(uiImage->getHeight());
    }

    unsigned maxTextureSize = conf->getMaxTextureSize();
    if( POTHigh > maxTextureSize || POTWide > maxTextureSize )
    {
        CCLOG("cocos2d: WARNING: Image (%u x %u) is bigger than the supported %u x %u", POTWide, POTHigh, maxTextureSize, maxTextureSize);
        this->release();
        return NULL;
    }

    // always load premultiplied images
    return initPremultipliedATextureWithImage(uiImage, POTWide, POTHigh);
}
bool CCTexture2D::initPremultipliedATextureWithImage(CCImage *image, unsigned int POTWide, unsigned int POTHigh)
{
    unsigned char*			data = NULL;
    unsigned char*			tempData =NULL;
    unsigned int*			inPixel32 = NULL;
    unsigned short*			outPixel16 = NULL;
    bool					hasAlpha;
    CCSize					imageSize;
    CCTexture2DPixelFormat	pixelFormat;

    hasAlpha = image->hasAlpha();

    size_t bpp = image->getBitsPerComponent();

    // compute pixel format
    if(hasAlpha)
    {
        pixelFormat = g_defaultAlphaPixelFormat;
    }
    else
    {
        if (bpp >= 8)
        {
            pixelFormat = kCCTexture2DPixelFormat_RGB888;
        }
        else
        {
            CCLOG("cocos2d: CCTexture2D: Using RGB565 texture since image has no alpha");
            pixelFormat = kCCTexture2DPixelFormat_RGB565;
        }
    }


    imageSize = CCSizeMake((float)(image->getWidth()), (float)(image->getHeight()));

    switch(pixelFormat) {
    case kCCTexture2DPixelFormat_RGBA8888:
    case kCCTexture2DPixelFormat_RGBA4444:
    case kCCTexture2DPixelFormat_RGB5A1:
    case kCCTexture2DPixelFormat_RGB565:
    case kCCTexture2DPixelFormat_A8:
        tempData = (unsigned char*)(image->getData());
        CCAssert(tempData != NULL, "NULL image data.");

        if(image->getWidth() == (short)POTWide && image->getHeight() == (short)POTHigh)
        {
            data = new unsigned char[POTHigh * POTWide * 4];
            memcpy(data, tempData, POTHigh * POTWide * 4);
        }
        else
        {
            data = new unsigned char[POTHigh * POTWide * 4];
            memset(data, 0, POTHigh * POTWide * 4);

            unsigned char* pPixelData = (unsigned char*) tempData;
            unsigned char* pTargetData = (unsigned char*) data;

            int imageHeight = image->getHeight();
            for(int y = 0; y < imageHeight; ++y)
            {
                memcpy(pTargetData+POTWide*4*y, pPixelData+(image->getWidth())*4*y, (image->getWidth())*4);
            }
        }

        break;
    case kCCTexture2DPixelFormat_RGB888:
        tempData = (unsigned char*)(image->getData());
        CCAssert(tempData != NULL, "NULL image data.");
        if(image->getWidth() == (short)POTWide && image->getHeight() == (short)POTHigh)
        {
            data = new unsigned char[POTHigh * POTWide * 3];
            memcpy(data, tempData, POTHigh * POTWide * 3);
        }
        else
        {
            data = new unsigned char[POTHigh * POTWide * 3];
            memset(data, 0, POTHigh * POTWide * 3);

            unsigned char* pPixelData = (unsigned char*) tempData;
            unsigned char* pTargetData = (unsigned char*) data;

            int imageHeight = image->getHeight();
            for(int y = 0; y < imageHeight; ++y)
            {
                memcpy(pTargetData+POTWide*3*y, pPixelData+(image->getWidth())*3*y, (image->getWidth())*3);
            }
        }
        break;
    default:
        CCAssert(0, "Invalid pixel format");
    }

    // Repack the pixel data into the right format

    if(pixelFormat == kCCTexture2DPixelFormat_RGB565) {
        //Convert "RRRRRRRRRGGGGGGGGBBBBBBBBAAAAAAAA" to "RRRRRGGGGGGBBBBB"
        tempData = new unsigned char[POTHigh * POTWide * 2];
        inPixel32 = (unsigned int*)data;
        outPixel16 = (unsigned short*)tempData;

        unsigned int length = POTWide * POTHigh;
        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
        }

        delete [] data;
        data = tempData;
    }
    else if (pixelFormat == kCCTexture2DPixelFormat_RGBA4444) {
        //Convert "RRRRRRRRRGGGGGGGGBBBBBBBBAAAAAAAA" to "RRRRGGGGBBBBAAAA"
        tempData = new unsigned char[POTHigh * POTWide * 2];
        inPixel32 = (unsigned int*)data;
        outPixel16 = (unsigned short*)tempData;

        unsigned int length = POTWide * POTHigh;
        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
        }

        delete [] data;
        data = tempData;
    }
    else if (pixelFormat == kCCTexture2DPixelFormat_RGB5A1) {
        //Convert "RRRRRRRRRGGGGGGGGBBBBBBBBAAAAAAAA" to "RRRRRGGGGGBBBBBA"
        tempData = new unsigned char[POTHigh * POTWide * 2];
        inPixel32 = (unsigned int*)data;
        outPixel16 = (unsigned short*)tempData;

        unsigned int length = POTWide * POTHigh;
        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
        }

        delete []data;
        data = tempData;
    }
    else if (pixelFormat == kCCTexture2DPixelFormat_A8)
    {
        // fix me, how to convert to A8
        pixelFormat = kCCTexture2DPixelFormat_RGBA8888;

        /*
         * The code can not work, how to convert to A8?
         *
        tempData = new unsigned char[POTHigh * POTWide];
        inPixel32 = (unsigned int*)data;
        outPixel8 = tempData;

        unsigned int length = POTWide * POTHigh;
        for(unsigned int i = 0; i < length; ++i, ++inPixel32)
        {
        	*outPixel8++ = (*inPixel32 >> 24) & 0xFF;
        }

        delete []data;
        data = tempData;
        */
    }

    if (data)
    {
        this->initWithData(data, pixelFormat, POTWide, POTHigh, imageSize);

        // should be after calling super init
        m_bHasPremultipliedAlpha = image->isPremultipliedAlpha();

        //CGContextRelease(context);
        delete [] data;
    }
    return true;
}

// implementation CCTexture2D (Text)
bool CCTexture2D::initWithString(const char *text, const char *fontName, float fontSize)
{
    return initWithString(text, CCSizeMake(0,0), CCTextAlignmentCenter, fontName, fontSize);
}
bool CCTexture2D::initWithString(const char *text, const CCSize& dimensions, CCTextAlignment alignment, const char *fontName, float fontSize)
{
#if CC_ENABLE_CACHE_TEXTTURE_DATA
    // cache the texture data
    VolatileTexture::addStringTexture(this, text, dimensions, alignment, fontName, fontSize);
#endif

    CCImage image;
    CCImage::ETextAlign eAlign = (CCTextAlignmentCenter == alignment) ? CCImage::kAlignCenter
                                 : (CCTextAlignmentLeft == alignment) ? CCImage::kAlignLeft : CCImage::kAlignRight;

    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,	0.0f,
        width + point.x,	point.y,	0.0f,
        point.x,			height  + point.y,	0.0f,
        width + point.x,	height  + point.y,	0.0f
    };

    glBindTexture(GL_TEXTURE_2D, m_uName);
    glVertexPointer(3, GL_FLOAT, 0, vertices);
    glTexCoordPointer(2, GL_FLOAT, 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*/
                         };

    glBindTexture(GL_TEXTURE_2D, m_uName);
    glVertexPointer(2, GL_FLOAT, 0, vertices);
    glTexCoordPointer(2, GL_FLOAT, 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()->isSupportsPVRTC()) )
    {
        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 = m_bPVRHaveAlphaPremultiplied;
    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(m_uPixelsWide, m_uPixelsHigh);
        m_bHasPremultipliedAlpha = m_bPVRHaveAlphaPremultiplied;
        m_ePixelFormat = pvr->getFormat();

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

    return bRet;
}

void CCTexture2D::setPVRImagesHavePremultipliedAlpha(bool haveAlphaPremultiplied)
{
    m_bPVRHaveAlphaPremultiplied = 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");
    glBindTexture( GL_TEXTURE_2D, this->m_uName );
    ccglGenerateMipmap(GL_TEXTURE_2D);
}

void CCTexture2D::setTexParameters(ccTexParams *texParams)
{
    CCAssert( (m_uPixelsWide == ccNextPOT(m_uPixelsWide) && m_uPixelsHigh == ccNextPOT(m_uPixelsHigh)) ||
              (texParams->wrapS == GL_CLAMP_TO_EDGE && texParams->wrapT == GL_CLAMP_TO_EDGE),
              "GL_CLAMP_TO_EDGE should be used in NPOT textures");
    glBindTexture( GL_TEXTURE_2D, this->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()
{
    ccTexParams texParams = { GL_NEAREST, GL_NEAREST, GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE };
    this->setTexParameters(&texParams);
}

void CCTexture2D::setAntiAliasTexParameters()
{
    ccTexParams texParams = { GL_LINEAR, GL_LINEAR, GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE };
    this->setTexParameters(&texParams);
}

//
// 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()
{
    unsigned int ret = 0;

    switch (m_ePixelFormat)
    {
    case kCCTexture2DPixelFormat_RGBA8888:
        ret = 32;
        break;
    case kCCTexture2DPixelFormat_RGB565:
        ret = 16;
        break;
    case kCCTexture2DPixelFormat_A8:
        ret = 8;
        break;
    case kCCTexture2DPixelFormat_RGBA4444:
        ret = 16;
        break;
    case kCCTexture2DPixelFormat_RGB5A1:
        ret = 16;
        break;
    case kCCTexture2DPixelFormat_PVRTC4:
        ret = 4;
        break;
    case kCCTexture2DPixelFormat_PVRTC2:
        ret = 2;
        break;
    case kCCTexture2DPixelFormat_I8:
        ret = 8;
        break;
    case kCCTexture2DPixelFormat_AI88:
        ret = 16;
        break;
    case kCCTexture2DPixelFormat_RGB888:
        ret = 24;
        break;
    default:
        ret = -1;
        assert(false);
        CCLOG("bitsPerPixelForFormat: %d, cannot give useful result", m_ePixelFormat);
        break;
    }
    return ret;
}

}//namespace   cocos2d