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

NAME
       glGetActiveSubroutineUniformName - query the name of an active shader
       subroutine uniform

C SPECIFICATION
       void glGetActiveSubroutineUniformName(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 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.

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

       length
	   Specifies the address of a variable into which is written the
	   number of characters copied into name.

       name
	   Specifies the address of a buffer that will receive the name of the
	   specified shader subroutine uniform.

DESCRIPTION
       glGetActiveSubroutineUniformName retrieves the name of an active shader
       subroutine uniform.  program contains the name of the program
       containing the uniform.	shadertype specifies the stage for 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.

       The uniform name is returned as a null-terminated string in name. The
       actual number of characters written into name, excluding the null
       terminator 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 specified by bufsize. The
       length of the longest subroutine uniform name in program and shadertype
       is given by the value of GL_ACTIVE_SUBROUTINE_UNIFORM_MAX_LENGTH, which
       can be queried with glGetProgramStage().

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(), 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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