我正在尝试将OpenGL项目正确渲染到iphone视网膜显示器，我似乎遇到了一些困难。我已将内容比例因子设置为设备，但现在无法创建帧缓冲区。
这都是在createFramebuffer方法的EAGLView的子类中完成的。
这是我的设置：
glGenFramebuffersOES（1，＆amp; viewFramebuffer）; glGenRenderbuffersOES（1，＆amp; viewRenderbuffer）;
glBindFramebufferOES(GL_FRAMEBUFFER_OES, viewFramebuffer);
glBindRenderbufferOES(GL_RENDERBUFFER_OES, viewRenderbuffer);
self.contentScaleFactor = [[UIScreen mainScreen] scale];
[context renderbufferStorage:GL_RENDERBUFFER_OES fromDrawable:(CAEAGLLayer*)self.layer];
glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_RENDERBUFFER_OES, viewRenderbuffer);
glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_WIDTH_OES, &backingWidth);
glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_HEIGHT_OES, &backingHeight);//Depth
glGenRenderbuffersOES(1, &depthRenderbuffer);
glBindRenderbufferOES(GL_RENDERBUFFER_OES, depthRenderbuffer);
glRenderbufferStorageOES(GL_RENDERBUFFER_OES, GL_DEPTH_COMPONENT16_OES, backingWidth, backingHeight);
glFramebufferRenderbufferOES(GL_FRAMEBUFFER_OES, GL_DEPTH_ATTACHMENT_OES, GL_RENDERBUFFER_OES, depthRenderbuffer);
glEnable(GL_DEPTH_TEST);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_BLEND);
NSLog(@"scale Factor: %f",self.contentScaleFactor);
正确报告比例因子但显示不会呈现，并且无法创建缓冲区。我在这里错过了什么吗？