用于JPEG的iPhone OpenGL ES纹理管道

UIImage* tI = [UIImage imageWithContentsOfFile:fileName];
Image = tI.CGImage;

mWidth = CGImageGetWidth(Image);
mHeight = CGImageGetHeight(Image);

mData = new uint8[mWidth * mHeight * 4];

Context = CGBitmapContextCreate(mData, mWidth, mHeight, CGImageGetBitsPerComponent(Image), CGImageGetBytesPerRow(Image), 
                                CGImageGetColorSpace(Image), 
                                CGImageGetBitmapInfo(Image));

CGContextDrawImage(Context, CGRectMake(0.0, 0.0, float(mWidth), float(mHeight)), Image);
CGContextRelease(Context);

glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, texture->Width(), texture->Height(), 0, GL_RGB, GL_UNSIGNED_BYTE, texture->Data());

glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, texture->Width(), texture->Height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, texture->Data());