gluNurbsCallback, gluQuadricCallback, gluTessCallback, glGetError
Copyright 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.
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gluErrorString: man2/gluErrorString.xml
gluErrorString produces an error string from a GL or GLU error code. The string is in ISO Latin 1 format. For example, gluErrorString ( GLU_OUT_OF_MEMORY ) returns the string. The standard GLU error codes are GLU_INVALID_ENUM, GLU_INVALID_VALUE, and GLU_OUT_OF_MEMORY. Certain other GLU functions can return specialized error codes through callbacks. See the glGetError reference page for the list of GL error codes.