通过学习CCSpriteFrameCache和CCTextureCache，作者大致了解了底层精灵帧和纹理的管理，这里备份下纹理的内部实现。
构造流程：
CCSpriteFrame需要CCTexture，CCTexture需要CCImage。
CCSprite需要CCTexture和CCSpriteFrame。
CCSpriteFrame较简单，这里就先省略了。
CCSprite需要后续统一分析。
CCImage分析:
分享个大神的blog:
【 http://blog.csdn.net/honghaier/article/details/8032434 】
CCTexture2D代码框架：
CCTexture2D的代码较复杂，涉及到了opengl的东西，作者也晕了，这里就简单的备份下最简单的调用流程。
bool CCTexture2D::initWithImage(CCImage *uiImage) |
return initPremultipliedATextureWithImage(uiImage, imageWidth, imageHeight); |
bool CCTexture2D::initPremultipliedATextureWithImage(CCImage *image, unsigned int width, unsigned int height) |
initWithData(tempData, pixelFormat, width, height, imageSize); |
if (tempData != image->getData()) |
m_bHasPremultipliedAlpha = image->isPremultipliedAlpha(); |
bool CCTexture2D::initWithData(const void *data, CCTexture2DPixelFormat pixelFormat, unsigned int pixelsWide, unsigned int pixelsHigh, const CCSize& contentSize) |
unsigned int bitsPerPixel; |
if(pixelFormat == kCCTexture2DPixelFormat_RGB888) |
bitsPerPixel = bitsPerPixelForFormat(pixelFormat); |
unsigned int bytesPerRow = pixelsWide * bitsPerPixel / 8; |
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); |
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 ); |
case kCCTexture2DPixelFormat_RGBA8888: |
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, (GLsizei)pixelsWide, (GLsizei)pixelsHigh, 0, GL_RGBA, GL_UNSIGNED_BYTE, data); |
case kCCTexture2DPixelFormat_RGB888: |
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, (GLsizei)pixelsWide, (GLsizei)pixelsHigh, 0, GL_RGB, GL_UNSIGNED_BYTE, data); |
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); |
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); |
case kCCTexture2DPixelFormat_RGB565: |
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, (GLsizei)pixelsWide, (GLsizei)pixelsHigh, 0, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, data); |
case kCCTexture2DPixelFormat_AI88: |
glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE_ALPHA, (GLsizei)pixelsWide, (GLsizei)pixelsHigh, 0, GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE, data); |
case kCCTexture2DPixelFormat_A8: |
glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, (GLsizei)pixelsWide, (GLsizei)pixelsHigh, 0, GL_ALPHA, GL_UNSIGNED_BYTE, data); |
case kCCTexture2DPixelFormat_I8: |
glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, (GLsizei)pixelsWide, (GLsizei)pixelsHigh, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, data); |
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; |
setShaderProgram(CCShaderCache::sharedShaderCache()->programForKey(kCCShader_PositionTexture)); |
CCSprite代码框架：
void CCSprite::setTexture(CCTexture2D *texture) |
void CCSprite::draw(void) |
ccGLBindTexture2D( m_pobTexture->getName() ); |
ccGLEnableVertexAttribs( kCCVertexAttribFlag_PosColorTex ); |
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