Other Queriable Values for GLSL

GL_CURRENT_PROGRAM

Contains the name of the program object that is currently installed as part of current state. If no program object is active, this value is 0. This value can be obtained with one of the variants of glGet.

GL_SHADING_LANGUAGE_VERSION

Contains the OpenGL Shading Language version that is supported by the implementation. It is organized as a dot-delimited sequence of multidigit integers. This value can be obtained with glGetString.