在iPhone上与Apple UI进行Alpha混合

Question

I am trying to place an OpenGL view on top of a standard UIView with a UIImageView. When I draw anything into the OpenGL view, I see slight alpha blending issues that result in the white lines seen below:

CCDirector *director = [CCDirector sharedDirector];
EAGLView *glView = [EAGLView viewWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)
                               pixelFormat:kEAGLColorFormatRGBA8    // kEAGLColorFormatRGBA8
                               depthFormat:0                        // GL_DEPTH_COMPONENT16_OES
                    ];
[glView setMultipleTouchEnabled:YES];

[director setOpenGLView:glView];

if(![director enableRetinaDisplay:YES]) NSLog(@"Retina Display Not supported");
[director setDeviceOrientation:kCCDeviceOrientationPortrait];
[director setAnimationInterval:1.0/60];

[CCTexture2D setDefaultAlphaPixelFormat:kCCTexture2DPixelFormat_RGBA8888];

[[CCDirector sharedDirector] runWithScene:[PPAvatarEditorScene scene]];
[[CCDirector sharedDirector] resume];
[glView setOpaque:NO];
[avatarImage addSubview:glView];

I am using Cocos2D to draw into the OpenGL view. Is there an issue with the Alpha Pixel Format or Texture Format?

Answer 1

尝试将glClearColor设置为黑色：

glClearColor(0, 0, 0, 0);