2010-2013 Khronos Group. glGetUniformSubroutine 3G glGetUniformSubroutine retrieve the value of a subroutine uniform of a given shader stage of the current program void glGetUniformSubroutineuiv GLenum shadertype GLint location GLuint *values 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. location Specifies the location of the subroutine uniform. values Specifies the address of a variable to receive the value or values of the subroutine uniform. glGetUniformSubroutine retrieves the value of the subroutine uniform at location location for shader stage shadertype of the current program. location must be less than the value of GL_ACTIVE_SUBROUTINE_UNIFORM_LOCATIONS for the shader currently in use at shader stage shadertype. The value of the subroutine uniform is returned in values. GL_INVALID_ENUM is generated if shadertype is not one of the accepted values. GL_INVALID_VALUE is generated if location is greater than or equal to the value of GL_ACTIVE_SUBROUTINE_UNIFORM_LOCATIONS for the shader currently in use at shader stage shadertype. GL_INVALID_OPERATION is generated if no program is active. glGetProgram, glGetActiveSubroutineUniform, glGetActiveSubroutineUniformName, glGetUniformLocation Copyright 2010-2013 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/.