NAME

       glGetActiveSubroutineName - query the name of an active shader subroutine

C SPECIFICATION

       void glGetActiveSubroutineName(GLuint program, GLenum shadertype, GLuint index,
                                      GLsizei bufsize, GLsizei *length, GLchar *name);

PARAMETERS

       program
           Specifies the name of the program containing the subroutine.

       shadertype
           Specifies the shader stage from which to query the subroutine name.

       index
           Specifies the index of the shader subroutine uniform.

       bufsize
           Specifies the size of the buffer whose address is given in name.

       length
           Specifies the address of a variable which is to receive the length of the shader
           subroutine uniform name.

       name
           Specifies the address of an array into which the name of the shader subroutine uniform
           will be written.

DESCRIPTION

       glGetActiveSubroutineName queries the name of an active shader subroutine uniform from the
       program object given in program.  index specifies the index of the shader subroutine
       uniform within the shader stage given by stage, and must between zero and the value of
       GL_ACTIVE_SUBROUTINES minus one for the shader stage.

       The name of the selected subroutine is returned as a null-terminated string in name. The
       actual number of characters written into name, not including the null-terminator, is 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 given in
       bufsize.

ERRORS

       GL_INVALID_VALUE is generated if index is greater than or equal to the value of
       GL_ACTIVE_SUBROUTINES.

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

ASSOCIATED GETS

       glGetProgramStage() with argument GL_ACTIVE_SUBROUTINE_UNIFORM_MAX_LENGTH

SEE ALSO

       glGetSubroutineIndex(), glGetActiveSubroutineUniform(), glGetProgramStage()

COPYRIGHT

       Copyright © 2010 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