2013 Khronos Group glGetProgramResourceIndex 3G glGetProgramResourceIndex query the index of a named resource within a program GLuint glGetProgramResourceIndex GLuint program GLenum programInterface const char * name 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. 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_TRANSFORM_FEEDBACK_BUFFER The query is targeted at the set of active buffer binding points to which output variables in the GL_TRANSFORM_FEEDBACK_VARYING interface are written. 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. GL_INVALID_ENUM is generated if programInterface is not one of the accepted interface types. GL_INVALID_ENUM is generated if programInterface is GL_ATOMIC_COUNTER_BUFFER or GL_TRANSFORM_FEEDBACK_BUFFER, since active atomic counter and transform feedback buffer resources are not assigned name strings. Although not an error, GL_INVALID_INDEX is returned if name is not the name of a resource within the interface identified by programInterface. glGetProgramResourceName, glGetGetProgramResource, glGetProgramResourceLocation, glGetProgramResourceLocationIndex. Copyright 2013 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/.