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

NAME
       glGetActiveSubroutineUniform - query a property of an active shader subroutine uniform

C SPECIFICATION
       void glGetActiveSubroutineUniformiv(GLuint program, GLenum shadertype, GLuint index,
					   GLenum pname, GLint *values);

PARAMETERS
       program
	   Specifies the name of the program containing the subroutine.

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

       index
	   Specifies the index of the shader subroutine uniform.

       pname
	   Specifies the parameter of the shader subroutine uniform to query.  pname must be
	   GL_NUM_COMPATIBLE_SUBROUTINES, GL_COMPATIBLE_SUBROUTINES, GL_UNIFORM_SIZE or
	   GL_UNIFORM_NAME_LENGTH.

       values
	   Specifies the address of a into which the queried value or values will be placed.

DESCRIPTION
       glGetActiveSubroutineUniform queries a parameter of an active shader subroutine uniform.
       program contains the name of the program containing the uniform.  shadertype specifies the
       stage which which the uniform location, given by index, is valid.  index must be between
       zero and the value of GL_ACTIVE_SUBROUTINE_UNIFORMS minus one for the shader stage.

       If pname is GL_NUM_COMPATIBLE_SUBROUTINES, a single integer indicating the number of
       subroutines that can be assigned to the uniform is returned in values.

       If pname is GL_COMPATIBLE_SUBROUTINES, an array of integers is returned in values, with
       each integer specifying the index of an active subroutine that can be assigned to the
       selected subroutine uniform. The number of integers returned is the same as the value
       returned for GL_NUM_COMPATIBLE_SUBROUTINES.

       If pname is GL_UNIFORM_SIZE, a single integer is returned in values. If the selected
       subroutine uniform is an array, the declared size of the array is returned; otherwise, one
       is returned.

       If pname is GL_UNIFORM_NAME_LENGTH, a single integer specifying the length of the
       subroutine uniform name (including the terminating null character) is returned in values.

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

       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_UNIFORMS

SEE ALSO
       glGetSubroutineIndex(), glGetActiveSubroutineUniformName(), glGetProgramStage()

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			 GLGETACTIVESUBROUTIN(3G)
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