无法在CADisplayLink渲染循环中绑定EAGLDrawable

我使用CADisplayLink渲染循环callback来渲染一系列openGL的图像纹理。 在CADisplayLink的第一个callback调用后，我只是得到这些错误输出

Failed to bind EAGLDrawable: <CAEAGLLayer: 0x946bb40> to GL_RENDERBUFFER 2 Failed to make complete framebuffer object 8cd6 

我设置了renderBuffer＆frameBuffer并在控制器的viewDidLoad阶段中调用glFramebufferRenderbuffer，glCheckFramebufferStatus的返回在该阶段没有问题。

这是我正在使用的代码。

 //GLKViewController.m typedef struct { GLKVector3 positionCoords; GLKVector2 textureCoords; }SceneVertex; static const SceneVertex vertices[] = { {{-1.0f, -1.0f, 0.0f}, {0.0f, 0.0f}}, // lower left corner {{ 1.0f, -1.0f, 0.0f}, {1.0f, 0.0f}}, // lower right corner {{-1.0f, 1.0f, 0.0f}, {0.0f, 1.0f}}, // upper left corner {{ 1.0f, 1.0f, 0.0f}, {1.0f, 1.0f}}, }; @interface myViewController () //glkViewController @property (nonatomic) GLuint renderBuffer; @property (nonatomic) GLuint frameBuffer; @property (nonatomic) GLuint glBuffer; @property (nonatomic) int renderWidth; @property (nonatomic) int renderHeight; @property(strong, nonatomic) CADisplayLink* displayLink; @property(strong, nonatomic) EAGLContext* context; @end @implementation myViewController -(void)setupBuffers { glGenFramebuffers(1, &_frameBuffer); glBindFramebuffer(GL_FRAMEBUFFER, _frameBuffer); glGenRenderbuffers(1, &_renderBuffer); glBindRenderbuffer(GL_RENDERBUFFER, _renderBuffer); [self.context renderbufferStorage:GL_RENDERBUFFER fromDrawable:(CAEAGLLayer*)self.view.layer]; glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, _renderBuffer); glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, &_renderWidth); glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, &_renderHeight); if(glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) { NSLog(@"AAfailed to make complete framebuffer object %x", glCheckFramebufferStatus(GL_FRAMEBUFFER)); } glGenBuffers(1,&_glBuffer); glBindBuffer(GL_ARRAY_BUFFER, _glBuffer); glBufferData( GL_ARRAY_BUFFER, // Initialize buffer contents sizeof(vertices), // Number of bytes to copy vertices, // Address of bytes to copy GL_STATIC_DRAW); // Hint: cache in GPU memory } -(void)loadView { _context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2]; self.view = [[myView alloc] initWithFrame:[[UIScreen mainScreen] bounds] context:_context]; } - (void)viewDidLoad { [super viewDidLoad]; [EAGLContext setCurrentContext:self.context]; [self setupBuffers]; _displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(render)]; [_displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode]; _displayLink.frameInterval = 1; } - (void)render { myView *view = (myView*)self.view; NSData *image = [view getOneImage]; //if nil, return or sleep&reget; glBindFramebuffer(GL_FRAMEBUFFER, _frameBuffer); glBindRenderbuffer(GL_RENDERBUFFER, _renderBuffer); glClearColor(0.0f, 1.0f, 0.0f, 1.0f); glClear(GL_COLOR_BUFFER_BIT); glViewport(0, 0, _renderWidth, _renderHeight); GLuint texture = -1; glGenTextures(1, &texture); glActiveTexture(GL_TEXTURE0); glPixelStorei(GL_UNPACK_ALIGNMENT, 1); glBindTexture(GL_TEXTURE_2D, texture); glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR ); glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR ); glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE ); glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE ); glTexImage2D( GL_TEXTURE_2D, 0, /* target, level */ GL_RGB, /* internal format */ _renderWidth, _renderHeight, 0, /* width, height, border */ GL_RGB, GL_UNSIGNED_BYTE, /* external format, type */ image.bytes /* pixels */ ); glBindBuffer(GL_ARRAY_BUFFER,_glBuffer); glEnableVertexAttribArray(GLKVertexAttribPosition); glVertexAttribPointer(GLKVertexAttribPosition, // Identifies the attribute to use 3, // number of coordinates for attribute GL_FLOAT, // data is floating point GL_FALSE, // no fixed point scaling sizeof(SceneVertex), // total num bytes stored NULL+offsetof(SceneVertex, positionCoords)); glBindBuffer(GL_ARRAY_BUFFER, _glBuffer); glEnableVertexAttribArray(GLKVertexAttribTexCoord0); glVertexAttribPointer(GLKVertexAttribTexCoord0, // Identifies the attribute to use 2, // number of coordinates for attribute GL_FLOAT, // data is floating point GL_FALSE, // no fixed point scaling sizeof(SceneVertex), // total num bytes stored per vertex NULL+offsetof(SceneVertex, textureCoords)); glDrawArrays(GL_TRIANGLES, 0, 3); glDrawArrays(GL_TRIANGLES, 1, 4); glBindFramebuffer(GL_FRAMEBUFFER, 0); glBindRenderbuffer(GL_RENDERBUFFER, 0); [_context presentRenderbuffer:GL_RENDERBUFFER]; glFlush(); glDeleteTextures(1, &texture); } @end //GLKView @implementation myView + (Class)layerClass { return [CAEAGLLayer class]; } - (id)initWithFrame:(CGRect)frame context:(EAGLContext *)context { self = [super initWithFrame:frame]; if (self) { self.drawableColorFormat = GLKViewDrawableColorFormatRGBA8888; self.context = context; CAEAGLLayer *layer= (CAEAGLLayer *)self.layer; self.images = [[NSMutableArray alloc] init]; layer.opaque = YES; layer.drawableProperties = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithBool:YES], kEAGLDrawablePropertyRetainedBacking, kEAGLColorFormatRGBA8, kEAGLDrawablePropertyColorFormat, nil]; } return self; } @end //APPDelegate - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; // Override point for customization after application launch. self.window.backgroundColor = [UIColor whiteColor]; self.window.rootViewController = [[QCPViewController alloc]init]; [self.window makeKeyAndVisible]; return YES; } 

Answer 1

当您尝试绘制当前不在屏幕上的openGL视图时，会发生这种情况。 在我的情况下，视图没有安装在我的故事板的当前大小类中。

如果您正在使用故事板，请仔细检查视图是否安装在当前的大小类中

1. 在故事板中select打开的GL视图
2. 转到“属性”检查器

3. validation视图安装在所有大小类如下

Answer 2

我正在经历同样的事情。 我正在从CADisplayLink的callback中创build和添加CADisplayLink 。 这是非常laggy，它是不可见的，并在控制台中显示的错误。 当我只是说dispatch_async(dispatch_get_main_queue(), ^{ /* code */ }); 那么一切都很好。