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GLGETSUBROUTINEINDEX(3G)		  OpenGL Manual 		 GLGETSUBROUTINEINDEX(3G)

NAME
       glGetSubroutineIndex - retrieve the index of a subroutine uniform of a given shader stage
       within a program

C SPECIFICATION
       GLuint glGetSubroutineIndex(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
       glGetSubroutineIndex returns the index of a subroutine uniform within a shader stage
       attached to a program object.  program contains the name of the program to which the
       shader is attached.  shadertype specifies the stage from which to query shader subroutine
       index.  name contains the null-terminated name of the subroutine uniform whose name to
       query.

       If name is not the name of a subroutine uniform in the shader stage, GL_INVALID_INDEX 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_SUBROUTINES minus one will
       be returned. Subroutine indices are assigned using consecutive integers in the range from
       zero to the value of GL_ACTIVE_SUBROUTINES minus one for the shader stage.

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.

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

COPYRIGHT
       Copyright (C) 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				    06/10/2014			 GLGETSUBROUTINEINDEX(3G)
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