CAOpenGLLayer no Antialiasing?

[Nik Youdale]

Hi,

I am having trouble enabling antialiasing in a CAOpenGLLayer subclass.  
Specifically I am trying to use Multisampling. I have set up the pixel  
format with multisampling enabled, etc. The same rendering code works  
in an NSOpenGLView with multisampling setup in the pixel format. (It  
draws in the CAOpenGLLayer, but sadly no antialiasing).

As far as i can tell, both segments of code (see below) should do  
exactly the same thing. Is there something obvious i'm missing? Or is  
it stated somewhere that CAOpenGLLayers don't support multisampling?

Cheers
- Nik




Code for CAOpenGLLayer:

@implementation MyOpenGLLayer

- (id) init
{
        self = [super init];
        if (self != nil) {
                self.needsDisplayOnBoundsChange = YES;
        }
        return self;
}


- (BOOL)isAsynchronous
{
        return YES;
}

- (CGLPixelFormatObj)copyCGLPixelFormatForDisplayMask:(uint32_t)mask {
        CGLPixelFormatAttribute attributes[] =
        {
                //kCGLPFADisplayMask, mask,
                kCGLPFAColorSize, 24,
                kCGLPFAAlphaSize, 8,
                kCGLPFADepthSize, 16,
                kCGLPFANoRecovery,
                kCGLPFAMultisample,
                kCGLPFASampleBuffers, 1,
                kCGLPFASamples, 4,
                0
        };
        CGLPixelFormatObj pixelFormatObj = NULL;
        GLint numPixelFormats = 0;
        CGLChoosePixelFormat(attributes, &pixelFormatObj, &numPixelFormats);
        if(pixelFormatObj == NULL)
                NSLog(@"Error: Could not choose pixel format!");
        return pixelFormatObj;
}

- (void)drawInCGLContext:(CGLContextObj)glContext pixelFormat: 
(CGLPixelFormatObj)pixelFormat forLayerTime: 
(CFTimeInterval)timeInterval displayTime:(const CVTimeStamp *)timeStamp
{
        CGLSetCurrentContext(glContext);
        
        glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
        glClear(GL_COLOR_BUFFER_BIT);
        
        glEnable(GL_BLEND);
        glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
        
        glEnable(GL_MULTISAMPLE);
        
        glColor4d(1.0, 0.0, 0.0, 1.0);
        glBegin(GL_TRIANGLES);
        glVertex3f(0.0, 0.0, 0.0);
        glVertex3f(0.0, 1.0, 0.0);
        glVertex3f(1.0, 0.0, 0.0);
        glEnd();
        
        glFlush();
}

@end



Code for NSOpenGLView:

@implementation MyOpenGLView

- (id) initWithFrame: (NSRect) frame
{
        NSOpenGLPixelFormatAttribute attribs[] = {
                NSOpenGLPFAWindow,
                NSOpenGLPFANoRecovery,
                NSOpenGLPFASampleBuffers, 1,
                NSOpenGLPFASamples, 4,
                NSOpenGLPFADoubleBuffer,
                NSOpenGLPFAColorSize, 24,
                NSOpenGLPFAAlphaSize, 8,
                NSOpenGLPFADepthSize, 24,
                0
        };
        
	NSOpenGLPixelFormat *fmt = [[NSOpenGLPixelFormat alloc]  
initWithAttributes:attribs];
        
        if (!fmt)
                NSLog(@"No OpenGL pixel format");
        
	return self = [super initWithFrame:frame pixelFormat:[fmt  
autorelease]];
}

- (void)drawRect:(NSRect)rect {
    // Drawing code here.
        glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
        glClear(GL_COLOR_BUFFER_BIT);
        
        glEnable(GL_MULTISAMPLE);
        
        glColor4d(1.0, 0.0, 0.0, 1.0);
        glBegin(GL_TRIANGLES);
        glVertex3f(0.0, 0.0, 0.0);
        glVertex3f(0.0, 1.0, 0.0);
        glVertex3f(1.0, 0.0, 0.0);
        glEnd();
        
        [[self openGLContext] flushBuffer];
}

@end

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