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NAME

       glGetProgramResourceLocation - query the location of a named resource
       within a program

C SPECIFICATION

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

PARAMETERS

       program
           The name of a program object whose resources to query.

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

       name
           The name of the resource to query the location of.

DESCRIPTION

       glGetProgramResourceLocation returns the location 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 GL_UNIFORM,
       GL_PROGRAM_INPUT, GL_PROGRAM_OUTPUT, GL_VERTEX_SUBROUTINE_UNIFORM,
       GL_TESS_CONTROL_SUBROUTINE_UNIFORM,
       GL_TESS_EVALUATION_SUBROUTINE_UNIFORM, GL_GEOMETRY_SUBROUTINE_UNIFORM,
       GL_FRAGMENT_SUBROUTINE_UNIFORM, GL_COMPUTE_SUBROUTINE_UNIFORM, or
       GL_TRANSFORM_FEEDBACK_BUFFER.

       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 glGetProgramResourceLocation is considered to
       match an active variable if:

       ·   the string exactly matches the name of the active variable

       ·   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

       ·   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.

ERRORS

       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 types.

       GL_INVALID_OPERATION is generated if program has not been linked
       successfully.

SEE ALSO

       glGetProgramResourceName(), glGetProgramResourceIndex(),
       glGetGetProgramResource(), glGetProgramResourceLocationIndex().

COPYRIGHT

       Copyright © 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.  http://opencontent.org/openpub/.

AUTHORS

       opengl.org



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