osx man page for glgetfragdataindex

GLGETFRAGDATAINDEX(3G)						    OpenGL 3.3						    GLGETFRAGDATAINDEX(3G)

NAME
       glGetFragDataIndex - query the bindings of color indices to user-defined varying out variables

C SPECIFICATION
       GLint glGetFragDataIndex(GLuint program, const char * name);

PARAMETERS
       program
	   The name of the program containing varying out variable whose binding to query

       name
	   The name of the user-defined varying out variable whose index to query

DESCRIPTION
       glGetFragDataIndex returns the index of the fragment color to which the variable name was bound when the program object program was last
       linked. If name is not a varying out variable of program, or if an error occurs, -1 will be returned.

NOTES
       glGetFragDataIndex is available only if the GL version is 3.3 or greater.

ERRORS
       GL_INVALID_OPERATION is generated if program is not the name of a program object.

SEE ALSO
       glCreateProgram(), glBindFragDataLocation(), glBindFragDataLocationIndexed(), glGetFragDataLocation()

COPYRIGHT
       Copyright (C) 2010 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication
       License, v 1.0, 8 June 1999.  http://opencontent.org/openpub/.

OpenGL 3.3							    03/08/2011						    GLGETFRAGDATAINDEX(3G)