glCheckFramebufferStatus在iOS 8中返回0

Question

我正在制作一个利用OpenGL ES 2.0渲染纹理的应用程序。我已经多次在iOS 7.1中测试了我的代码而没有错误。更新到iOS 8.0后，我在glCheckFramebufferStatus上返回0。经过一些研究后，我发现glCheckFramebufferStatus在出现错误时返回0。有谁知道为什么在更新到iOS 8.0后会发生这种情况？这是我的代码：

// Generate renderBufferer
glGenRenderbuffers(1, &viewRenderbuffer);
glBindRenderbuffer(GL_RENDERBUFFER, viewRenderbuffer);
[context renderbufferStorage:GL_RENDERBUFFER fromDrawable:(id<EAGLDrawable>)self.layer];
glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, &backingWidth);
glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, &backingHeight);

// Generate  a framebuffer object for texture handling
glGenFramebuffers(1, &textureFrameBuffer);
glBindFramebuffer(GL_FRAMEBUFFER, textureFrameBuffer);

// Generate texture and bind to frameBuffer
glGenTextures(1, &layers[0]);
glBindTexture(GL_TEXTURE_2D, layers[0]);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,  backingWidth, backingHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, layers[0], 0);

if(glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE){
    NSLog(@"failed to make complete textureFrameBuffer objects %x", glCheckFramebufferStatus(GL_FRAMEBUFFER));
    // returns "failed to make complete textureFrameBuffer objects 0"
    return NO;
}