Q:
How do I tell if a particular display is being hardware accelerated
by Quartz Extreme?
A:
As of Mac OS X 10.2 (Jaguar), there is a new API in "CGDisplayConfiguration.h" called
CGDisplayUsesOpenGLAcceleration for just that purpose. "CGDisplayConfiguration.h"
can be found in the Core Graphics framework (CoreGraphics.framework)
which is part of the Application Services framework (ApplicationServices.framework).
Listing 1 shows the typical usage for CGDisplayUsesOpenGLAcceleration.
/*
CGDisplayUsesOpenGLAcceleration() takes a CGDirectDisplayID
parameter and returns a boolean_t result
*/
/* Prototype for CGDisplayUsesOpenGLAcceleration() */
#include <ApplicationServices/ApplicationServices.h>
/* Code that cares whether or not the display is accelerated */
if ( CGDisplayUsesOpenGLAcceleration( displayID ) )
{
/* Provide full graphics */
}
else
{
/* Provide reduced graphics */
}
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Listing 1. Checking for OpenGL acceleration
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[Dec 03 2002]
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