NAME

       glGetProgramResourceName - query the name of an indexed resource within a program

C SPECIFICATION

       void glGetProgramResourceName(GLuint program, GLenum programInterface, GLuint index,
                                     GLsizei bufSize, GLsizei * length, char * name);

PARAMETERS

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

       programInterface
           A token identifying the interface within program containing the indexed resource.

       index
           The index of the resource within programInterface of program.

       bufSize
           The size of the character array whose address is given by name.

       length
           The address of a variable which will receive the length of the resource name.

       name
           The address of a character array into which will be written the name of the resource.

DESCRIPTION

       glGetProgramResourceName retrieves the name string assigned to the single active resource
       with an index of index in the interface programInterface of program object program.  index
       must be less than the number of entries in the active resource list for programInterface.

       program must be the name of an existing program object.  programInterface is the name of
       the interface within program which contains the resource and 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.

       The name string assigned to the active resource identified by index is returned as a
       null-terminated string in the character array whose address is given in name. The actual
       number of characters written into name, excluding the null terminator, is returned in
       length. If length is NULL, no length is returned. The maximum number of characters that
       may be written into name, including the null terminator, is specified by bufSize. If the
       length of the name string including the null terminator is greater than bufSize, the first
       bufSize-1 characters of the name string will be written to name, followed by a null
       terminator. If bufSize is zero, no error will be generated but no characters will be
       written to name. The length of the longest name string for programInterface>, including a
       null terminator, can be queried by calling glGetProgramInterface() with a pname of
       GL_MAX_NAME_LENGTH.

ERRORS

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

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

       GL_INVALID_VALUE is generated if index is greater than or equal to the number of entries
       in the active resource list for programInterface.

       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.

SEE ALSO

       glGetProgramResourceIndex(), 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