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CAOpenGLLayer question (timeInterval)

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CAOpenGLLayer question (timeInterval)

Subject: CAOpenGLLayer question (timeInterval)
From: John Clayton <email@hidden>
Date: Thu, 22 Nov 2007 23:57:36 +0100

Hello All,

Hope you aint all sick of these... here's another CAOpenGLLayer question. In the method:

- (void)drawInCGLContext:(CGLContextObj)glContext
			 pixelFormat:(CGLPixelFormatObj)pixelFormat
			forLayerTime:(CFTimeInterval)timeInterval
			 displayTime:(const CVTimeStamp *)timeStamp

I implement this and render Quicktime movies via visual contexts... all works semi-lovely (I cannot render frames in the past, but thats another story), except - sometimes this method is given a timeInterval of -1, does anyone know what this means?

Thanks

--
John Clayton


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