osx man page for glgetfragdatalocation

GLGETFRAGDATALOCATIO(3G)					    OpenGL 3.3						  GLGETFRAGDATALOCATIO(3G)

NAME
       glGetFragDataLocation - query the bindings of color numbers to user-defined varying out variables

C SPECIFICATION
       GLint glGetFragDataLocation(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 binding to query

DESCRIPTION
       glGetFragDataLocation retrieves the assigned color number binding for the user-defined varying out variable name for program program.
       program must have previously been linked.  name must be a null-terminated string. If name is not the name of an active user-defined varying
       out fragment shader variable within program, -1 will be returned.

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

SEE ALSO
       glCreateProgram(), glBindFragDataLocation()

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						  GLGETFRAGDATALOCATIO(3G)