Hi there,
I've just upgraded to Leopard and find that some CoreVideo integration
that I'm doing with Quartz Composer is not working now. Things were
all fine for Tiger. :-)
When it comes to rendering here's what I start with:
CVReturn returnVal = CVOpenGLBufferAttach(
coreVideoBufferP,
reinterpret_cast<CGLContextObj>([secondFullScreenOpenGLContext
CGLContextObj]),
0,
0,
0
);
NSAssert(returnVal == kCVReturnSuccess, @"CVOpenGLBufferAttach failed");
[secondFullScreenOpenGLContext makeCurrentContext];
I then render my GL world and:
glFlush();
[secondFullScreenOpenGLContext clearDrawable];
After that I call upon Quartz Composer:
// Set up our world image input with our CV buffer
[qcRenderer setValue:(id)coreVideoBufferP forInputKey:@"World_Image"];
//Render a frame
[qcRenderer renderAtTime:theCurrentTime arguments:0];
//Flush the OpenGL context to display the frame on screen
[fullScreenOpenGLContext flushBuffer];
Here's how I create my CV context:
NSAssert(fullScreenGLPixelFormat, @"!fullScreenGLPixelFormat");
secondFullScreenOpenGLContext = [[NSOpenGLContext alloc]
initWithFormat:fullScreenGLPixelFormat
shareContext:viewOpenGLContext];
if (secondFullScreenOpenGLContext) {
float theUserSpaceScaleFactor = 1.0;
float theScreenWidth = static_cast<float>(CGDisplayPixelsWide(
displayIDs[displayIDIndex])) * theUserSpaceScaleFactor;
float theScreenHeight = static_cast<float>(CGDisplayPixelsHigh(
displayIDs[displayIDIndex])) * theUserSpaceScaleFactor;
NSAssert(coreVideoBufferP == 0, @"coreVideoBufferP != 0");
CVReturn theReturnVal = CVOpenGLBufferCreate(
0,
theScreenWidth,
theScreenHeight,
0,
&coreVideoBufferP
);
NSAssert(theReturnVal == kCVReturnSuccess && coreVideoBufferP ,
@"!(returnVal == kCVReturnSuccess && coreVideoBuffer)");
}
Any hints on what may have changed in Leopard with regards to Core
Video/Quartz Composer? Could this even be a resolution independence
thing somehow?
Cheers,
-C
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