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POWhy is my CAOpenGLLayer updating slower than my previous NSOpenGLView?
 

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  1. POWhy is my CAOpenGLLayer updating slower than my previous NSOpenGLView?
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    <p>I have an application which renders OpenGL content on Mac OS X. Originally it was rendering to an NSOpenGLView, then I changed it to render to a CAOpenGLLayer subclass. </p> <p>When I did so I saw a huge performance loss: halved framerate, lower mouse responsivity, stuttering (stops from time to time, up to a second, during which profiler activity reports waiting on mutex for data to load on GPU ram), and doubled CPU usage.</p> <p>I'm investigating this issue and had a few questions:</p> <ul> <li>Has a similar performance hit been seen by someone else?</li> <li>Am I doing something wrong with my CAOpenGLLayer setup?</li> <li>How is CAOpenGLLayer and the Core Animation framework implemented, i.e. what path does my OpenGL content do from my glDrawElements calls up to my screen, and how should I do things on my side to optimize performance with such setup?</li> </ul> <p>Here's my code for CAOpenGLLayer setup:</p> <pre><code>// my application's entry point (can't be easily changed): void AppUpdateLogic(); //update application logic. Will load textures void AppRender(); //executes drawing void AppEventSink(NSEvent* ev); //handle mouse and keyboard events. //Will do pick renderings @interface MyCAOpenGLLayer: CAOpenGLLayer { CGLPixelFormatObj pixelFormat; CGLContextObj glContext; } @end @implementation MyCAOpenGLLayer - (id)init { self = [super init]; CGLPixelFormatAttribute attributes[] = { kCGLPFAAccelerated, kCGLPFAColorSize, (CGLPixelFormatAttribute)24, kCGLPFAAlphaSize, (CGLPixelFormatAttribute)8, kCGLPFADepthSize, (CGLPixelFormatAttribute)16, (CGLPixelFormatAttribute)0 }; GLint numPixelFormats = 0; CGLChoosePixelFormat(attributes, &amp;pixelFormat, &amp;numPixelFormats); glContext = [super copyCGLContextForPixelFormat:mPixelFormat]; return self; } - (void)drawInCGLContext:(CGLContextObj)inGlContext pixelFormat:(CGLPixelFormatObj)inPixelFormat forLayerTime:(CFTimeInterval)timeInterval displayTime:(const CVTimeStamp *)timeStamp { AppRender(); [super drawInCGLContext:inGlContext pixelFormat:inPixelFormat forLayerTime:timeInterval displayTime:timeStamp ] } - (void)releaseCGLPixelFormat:(CGLPixelFormatObj)pixelFormat { [self release]; } - (CGLPixelFormatObj)copyCGLPixelFormatForDisplayMask:(uint32_t)mask { [self retain]; return pixelFormat; } - (CGLContextObj)copyCGLContextForPixelFormat:(CGLPixelFormatObj)pixelFormat { [self retain]; return glContext; } - (void)releaseCGLContext:(CGLContextObj)glContext { [self release]; } @end @interface MyMainViewController: NSViewController { CGLContextObj glContext; CALayer* myOpenGLLayer; } -(void)timerTriggered:(NSTimer*)timer; @end @implementation MyMainViewController -(void)viewDidLoad:(NSView*)view { myOpenGLLayer = [[MyCAOpenGLLayer alloc] init]; [view setLayer:myOpenGLLayer]; [view setWantsLayer:YES]; glContext = [myOpenGLLayer copyCGLContextForPixelFormat:nil]; [NSTimer scheduledTimerWithTimeInterval:1/30.0 target:self selector:@selector(timerTriggered:) userInfo:nil repeats:YES ]; } - (void)timerTriggered:(NSTimer*)timer { CGLContextObj oldContext = CGLContextGetCurrent(); CGLContextSetCurrent(glContext); CGLContextLock(glContext); AppUpdateLogic(); [myOpenGLLayer setNeedsDisplay:YES]; CGLContextUnlock(glContext); CGLContextSetCurrent(oldContext); } - (void)mouseDown:(NSEvent*)event { CGLContextObj oldContext = CGLContextGetCurrent(); CGLContextSetCurrent(glContext); CGLContextLock(glContext); AppEventSink(event); CGLContextUnlock(glContext); CGLContextSetCurrent(oldContext); } @end </code></pre> <p>It may be useful to know my video card isn't very powerful (Intel GMA with 64 MB of shared memory).</p>
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