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glIsAsyncMarkerSGIX(3G)	       OpenGL Reference	       glIsAsyncMarkerSGIX(3G)

NAME
     glIsAsyncMarkerSGIX - determine if a marker is reserved or in use

C SPECIFICATION
     GLboolean glIsAsyncMarkerSGIX( GLuint marker )

PARAMETERS
     marker  Specifies a potential value for a reserved or in-use marker.

DESCRIPTION
     glIsAsyncMarkerSGIX is part of the SGIX_async extension.  This extension
     provides a framework within which particular sets of OpenGL commands can
     become "asynchronous" via specific further OpenGL extensions.  Currently
     the SGIX_async_pixel extension is the only such defined extension.

     A marker for asynchronous commands is "in use" if it is the current value
     of GL_ASYNC_MARKER_SGIX, or if it is associated with any asynchronous
     command that has been issued but has not been queried using
     glFinishAsyncSGIX or glPollAsyncSGIX.  A marker may be "reserved" via use
     of the glGenAsyncMarkersSGIX command.

     glIsAsyncMarkerSGIX returns 1 if marker identifies a marker that is
     currently in use or reserved; it returns 0 otherwise.

ERRORS
     GL_INVALID_OPERATION is generated if glIsAsyncMarkerSGIX is executed
     between the execution of glBegin and the corresponding execution of
     glEnd.

MACHINE DEPENDENCIES
     The SGIX_async and SGIX_async_pixel extensions are implemented only on
     Octane2 VPro systems.

SEE ALSO
     glAsyncMarkerSGIX, glDeleteAsyncMarkersSGIX, glFinishAsyncSGIX,
     glGenAsyncMarkersSGIX, glPollAsyncSGIX, glDrawPixels, glGet,
     glReadPixels, glTexImage1D, glTexImage2D, glTexImage3D, glTexSubImage1D,
     glTexSubImage2D, glTexSubImage3D

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