glGetProgram, glGetActiveSubroutineUniform, glGetActiveSubroutineUniformName, glGetUniformLocation
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glGetUniformSubroutine: man4/glGetUniformSubroutine.xml
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.