GLGETSUBROUTINEUNIFO(3G)        [FIXME: manual]       GLGETSUBROUTINEUNIFO(3G)

NAME
       glGetSubroutineUniformLocation - retrieve the location of a subroutine
       uniform of a given shader stage within a program

C SPECIFICATION
       GLint glGetSubroutineUniformLocation(GLuint program, GLenum shadertype,
                                            const GLchar *name);

PARAMETERS
       program
           Specifies the name of the program containing shader stage.

       shadertype
           Specifies the shader stage from which to query for subroutine
           uniform index.  shadertype must be one of GL_VERTEX_SHADER,
           GL_TESS_CONTROL_SHADER, GL_TESS_EVALUATION_SHADER,
           GL_GEOMETRY_SHADER or GL_FRAGMENT_SHADER.

       name
           Specifies the name of the subroutine uniform whose index to query.

DESCRIPTION
       glGetSubroutineUniformLocation returns the location of the subroutine
       uniform variable name in the shader stage of type shadertype attached
       to program, with behavior otherwise identical to
       glGetUniformLocation().

       If name is not the name of a subroutine uniform in the shader stage, -1
       is returned, but no error is generated. If name is the name of a
       subroutine uniform in the shader stage, a value between zero and the
       value of GL_ACTIVE_SUBROUTINE_LOCATIONS minus one will be returned.
       Subroutine locations are assigned using consecutive integers in the
       range from zero to the value of GL_ACTIVE_SUBROUTINE_LOCATIONS minus
       one for the shader stage. For active subroutine uniforms declared as
       arrays, the declared array elements are assigned consecutive locations.

ERRORS
       GL_INVALID_ENUM is generated if shadertype or pname is not one of the
       accepted values.

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

VERSION SUPPORT

       +-------------------------------+-----------------------------------------------------------------------+
       |                               |                            OpenGL Version                             |
       +-------------------------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
       |Function / Feature Name        | 2.0 | 2.1 | 3.0 | 3.1 | 3.2 | 3.3 | 4.0 | 4.1 | 4.2 | 4.3 | 4.4 | 4.5 |
       +-------------------------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+
       |glGetSubroutineUniformLocation |  -  |  -  |  -  |  -  |  -  |  -  | <?> | <?> | <?> | <?> | <?> | <?> |
       +-------------------------------+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+-----+

SEE ALSO
       glGetProgram(), glGetActiveSubroutineUniform(),
       glGetActiveSubroutineUniformName(), glGetUniformLocation()

COPYRIGHT
       Copyright (C) 2010-2014 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/.

COPYRIGHT
       Copyright (C) 2010-2014 Khronos Group.

[FIXME: source]                   05/21/2022          GLGETSUBROUTINEUNIFO(3G)