How do I tell if a particular display is being hardware accelerated by Quartz Extreme?

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  Checking for OpenGL acceleration using CGDisplayUsesOpenGLAcceleration.

/* Prototype for CGDisplayUsesOpenGLAcceleration() */

/*

 CGDisplayUsesOpenGLAcceleration() takes a CGDirectDisplayID

 parameter and returns a boolean_t result

 */

#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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