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GLGETACTIVESUBROUTIN(3G)	 OpenGL Manual	      GLGETACTIVESUBROUTIN(3G)

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

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

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