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GLGETPROGRAMRESOURCE(3G)	 OpenGL Manual	      GLGETPROGRAMRESOURCE(3G)

NAME
       glGetProgramResourceIndex - query the index of a named resource within
       a program

C SPECIFICATION
       GLuint glGetProgramResourceIndex(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 index of.

DESCRIPTION
       glGetProgramResourceIndex returns the unsigned integer index assigned
       to a resource named name in the interface type programInterface of
       program object program.

       program must be the name of an existing program object.
       programInterface is the name of the interface within program which
       contains the resource named nameand must be one of the following
       values:

       GL_UNIFORM
	   The query is targeted at the set of active uniforms within program.

       GL_UNIFORM_BLOCK
	   The query is targeted at the set of active uniform blocks within
	   program.

       GL_PROGRAM_INPUT
	   The query is targeted at the set of active input variables used by
	   the first shader stage of program. If program contains multiple
	   shader stages then input variables from any stage other than the
	   first will not be enumerated.

       GL_PROGRAM_OUTPUT
	   The query is targeted at the set of active output variables
	   produced by the last shader stage of program. If program contains
	   multiple shader stages then output variables from any stage other
	   than the last will not be enumerated.

       GL_VERTEX_SUBROUTINE, GL_TESS_CONTROL_SUBROUTINE,
       GL_TESS_EVALUATION_SUBROUTINE, GL_GEOMETRY_SUBROUTINE,
       GL_FRAGMENT_SUBROUTINE, GL_COMPUTE_SUBROUTINE
	   ,
			   ,
			   ,
			   ,
			   ,
			   The query is targeted at the set of active
	   subroutines for the vertex, tessellation control, tessellation
	   evaluation, geometry, fragment and compute shader stages of
	   program, respectively.

       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
	   ,
			   ,
			   ,
			   ,
			   ,
			   The query is targeted at the set of active
	   subroutine uniform variables used by the vertex, tessellation
	   control, tessellation evaluation, geometry, fragment and compute
	   shader stages of program, respectively.

       GL_TRANSFORM_FEEDBACK_VARYING
	   The query is targeted at the set of output variables from the last
	   non-fragment stage of program that would be captured if transform
	   feedback were active.

       GL_BUFFER_VARIABLE
	   The query is targeted at the set of active buffer variables used by
	   program.

       GL_SHADER_STORAGE_BLOCK
	   The query is targeted at the set of active shader storage blocks
	   used by program.

       If name exactly matches the name string of one of the active resources
       for programInterface, the index of the matched resource is returned.
       Additionally, if name would exactly match the name string of an active
       resource if "[0]" were appended to name, the index of the matched
       resource is returned. Otherwise, name is considered not to be the name
       of an active resource, and GL_INVALID_INDEX is returned.

       For the interface GL_TRANSFORM_FEEDBACK_VARYING, the value
       GL_INVALID_INDEX should be returned when querying the index assigned to
       the special names gl_NextBuffer, gl_SkipComponents1,
       gl_SkipComponents2, gl_SkipComponents3, or gl_SkipComponents4.

ERRORS
       GL_INVALID_ENUM is generated if programInterface is not one of the
       accepted interface types.

       Although not an error, GL_INVALID_INDEX is returned if name is not the
       name of a resource within the interface identified by programInterface.

SEE ALSO
       glGetProgramResourceName(), glGetGetProgramResource(),
       glGetProgramResourceLocation(), 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

opengl.org			  03/16/2013	      GLGETPROGRAMRESOURCE(3G)

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