本文介绍了一种使用OpenGL ES进行纹理渲染和帧缓冲操作的技术，包括纹理生成、帧缓冲创建及检查完整性的过程。通过实例展示了如何在iOS应用中将场景渲染到纹理，再将纹理作为背景呈现于用户界面。
- (void)setupTexture {
GLint width;
GLint height;
width = self.frame.size.width;
height = self.frame.size.height;
glGenTextures(1, &_textureId);
glBindTexture(GL_TEXTURE_2D,_textureId);
glTexImage2D(GL_TEXTURE_2D,0, GL_RGBA, width, height,0, GL_RGBA,GL_UNSIGNED_BYTE,NULL);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER, GL_NEAREST);
}
- (void)setupMemFrameBuffer {
glGenFramebuffers(1, &_memFrameBuffer);
glBindFramebuffer(GL_FRAMEBUFFER,_memFrameBuffer);
glFramebufferTexture2D(GL_FRAMEBUFFER,GL_COLOR_ATTACHMENT0,
GL_TEXTURE_2D, _textureId, 0);
GLenum status =glCheckFramebufferStatus(GL_FRAMEBUFFER) ;
if(status !=GL_FRAMEBUFFER_COMPLETE)
{
NSLog(@"failed to make complete framebuffer object %x", status);
}
}
范例工程：
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