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CentOS 7.0 - man page for glgetprogramresourcelocationindex (centos section 3G)

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       glGetProgramResourceLocationIndex - query the fragment color index of a named variable
       within a program

       GLint glGetProgramResourceLocationIndex(GLuint program, GLenum programInterface,
					       const char * name);

	   The name of a program object whose resources to query.

	   A token identifying the interface within program containing the resource named name.

	   The name of the resource to query the location of.

       glGetProgramResourceLocation returns the fragment color index assigned to the variable
       named name in interface programInterface of program object program.  program must be the
       name of a program that has been linked successfully.  programInterface must be one of
       PROGRAM_OUTPUT. The value -1 will be returned if an error occurs, if name does not
       identify an active variable on programInterface, or if name identifies an active variable
       that does not have a valid location assigned, as described above. The locations returned
       by these commands are the same locations returned when querying the GL_LOCATION and
       GL_LOCATION_INDEX resource properties.

       A string provided to glGetProgramResourceLocationIndex is considered to match an active
       variable if:

       o   the string exactly matches the name of the active variable

       o   if the string identifies the base name of an active array, where the string would
	   exactly match the name of the variable if the suffix "[0]" were appended to the string

       o   if the string identifies an active element of the array, where the string ends with
	   the concatenation of the "[" character, an integer with no "+" sign, extra leading
	   zeroes, or whitespace identifying an array element, and the "]" character, the integer
	   is less than the number of active elements of the array variable, and where the string
	   would exactly match the enumerated name of the array if the decimal integer were
	   replaced with zero.

       Any other string is considered not to identify an active variable. If the string specifies
       an element of an array variable, glGetProgramResourceLocation returns the location
       assigned to that element. If it specifies the base name of an array, it identifies the
       resources associated with the first element of the array.

       GL_INVALID_VALUE is generated if program is not the name of an existing program object.

       GL_INVALID_ENUM is generated if programInterface is not one of the accepted interface

       GL_INVALID_OPERATION is generated if program has not been linked successfully.

       glGetProgramResourceName(), glGetProgramResourceIndex(), glGetGetProgramResource(),

       Copyright (C) 2012 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.


opengl.org				    06/10/2014			 GLGETPROGRAMRESOURCE(3G)
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