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GL_ARB_shader_subroutine
http://www.opengl.org/registry/specs/ARB/shader_subroutine.txt
GL_ARB_shader_subroutine
	GL_ACTIVE_SUBROUTINES 0x8DE5
	GL_ACTIVE_SUBROUTINE_UNIFORMS 0x8DE6
	GL_MAX_SUBROUTINES 0x8DE7
	GL_MAX_SUBROUTINE_UNIFORM_LOCATIONS 0x8DE8
	GL_ACTIVE_SUBROUTINE_UNIFORM_LOCATIONS 0x8E47
	GL_ACTIVE_SUBROUTINE_MAX_LENGTH 0x8E48
	GL_ACTIVE_SUBROUTINE_UNIFORM_MAX_LENGTH 0x8E49
	GL_NUM_COMPATIBLE_SUBROUTINES 0x8E4A
	GL_COMPATIBLE_SUBROUTINES 0x8E4B
	void glGetActiveSubroutineName (GLuint program, GLenum shadertype, GLuint index, GLsizei bufsize, GLsizei* length, GLchar *name)
	void glGetActiveSubroutineUniformName (GLuint program, GLenum shadertype, GLuint index, GLsizei bufsize, GLsizei* length, GLchar *name)
	void glGetActiveSubroutineUniformiv (GLuint program, GLenum shadertype, GLuint index, GLenum pname, GLint* values)
	void glGetProgramStageiv (GLuint program, GLenum shadertype, GLenum pname, GLint* values)
	GLuint glGetSubroutineIndex (GLuint program, GLenum shadertype, const GLchar* name)
	GLint glGetSubroutineUniformLocation (GLuint program, GLenum shadertype, const GLchar* name)
	void glGetUniformSubroutineuiv (GLenum shadertype, GLint location, GLuint* params)
	void glUniformSubroutinesuiv (GLenum shadertype, GLsizei count, const GLuint* indices)