Re: Tearing CVDisplayLink

Subject: Re: Tearing CVDisplayLink

Date: Mon, 24 Mar 2008 16:57:12 -0400

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obvious question and im sure the answer is yes, but does your GL context is double buffered and VBL synced?

NSOpenGLPixelFormatAttribute attributes[] = {NSOpenGLPFAAccelerated, NSOpenGLPFANoRecovery, NSOpenGLPFADoubleBuffer, NSOpenGLPFADepthSize, 24, 0};

GLint swapInterval = 1;

v001GLPixelFormat = [[NSOpenGLPixelFormat alloc] initWithAttributes:attributes];

v001GLPreviewContext = [[NSOpenGLContext alloc] initWithFormat:v001GLPixelFormat shareContext:nil];

On Mar 24, 2008, at 4:45 PM, Christopher Wright wrote:

I've got an application that uses a CVDisplayLink to drive a QCRenderer (patterned basically off of the Quartz Composer Performer example app). However, there are occasions where the output exhibits some tearing (or shearing), as though the display link isn't quite synchronized with vsync.

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