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Problems rendering to image on Leopard - only certain machines

I have just reported a problem to apple's bug reporter <rdar://5565851> about a problem I'm having with code that renders a frame of a QC to an image using QCRenderer, adapted from some code that Pierre posted here a long time ago.

What's happening is that some code that works fine under Tiger and on some machines running Leopard (like my G5), it's failing miserably on a MacBookPro and a 20" iMac.  The resulting image is generally invisible (or nearly so) or has its colors shifted strangely.

Has something in the architecture changed that maybe I need to work around?  I want to make sure that if it's not a bug, that there is some workaround...

Otherwise I hope this can be fixed for 10.5.1  :-)







Here are some snippets to show you approximately what I'm doing.  (The bug report, for Apple folks, does have a full test project and positive/negative examples.)


NSOpenGLPixelFormatAttribute attributes[] = {
NSOpenGLPFAAccelerated,
NSOpenGLPFANoRecovery,
(NSOpenGLPixelFormatAttribute)0
};
NSOpenGLPixelFormat* format = [[NSOpenGLPixelFormat alloc] initWithAttributes:attributes];
NSOpenGLContext* context = [[NSOpenGLContext alloc] initWithFormat:format shareContext:nil];
CGLContextObj cgl_ctx = [context CGLContextObj];
if(cgl_ctx)
{
glViewport(0, 0, width, height);
}
QCRenderer* renderer = [[QCRenderer alloc] initWithOpenGLContext:context pixelFormat:format file:aFileName];

.... followed by ....

BOOL renderSuccess = [renderer renderAtTime:0.0 arguments:nil];
...
id image = [myRenderer valueForOutputKey:@"Image"];


--
Dan Wood
Karelia Software — Sandvox for the Mac

"A nation of sheep will beget a government of wolves" – Edward R. Murrow



 

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