no version
version 100 (only valid for ES)
version 110 (only valid for compatibility desktop GL)
version 120 (only valid for compatibility desktop GL)
version 130 (only valid for compatibility desktop GL)
version 140 (only valid for compatibility desktop GL)
version 150 (valid for compatibility/core desktop GL)
version 300 (only valid for ES)
version 310 (only valid for ES)
version 320 (only valid for ES)
version 330 (valid for compatibility/core desktop GL)
version 400 (valid for compatibility/core desktop GL)
version 410 (valid for compatibility/core desktop GL)
version 420 (valid for compatibility/core desktop GL)
version 430 (valid for compatibility/core desktop GL)
version 440 (valid for compatibility/core desktop GL)
version 450 (valid for compatibility/core desktop GL)
GLSL version list