opengl es 2.0 Reder to texture iOS

- (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);

    }

}

範例工程：

LxOpenglES_RenderToTexture