Question

What is the difference between glEnable and glEnableClientState? Every time I need a mode set/unset I have to look at the reference to know which of those will accept it. Os there any general rule which says what modes goes into which one?

Answer 1

In addition to tibur’s answer, in practice the only use of glEnableClientState and glDisableClientState is for enabling/disabling the builtin fixed-function attribute arrays (like GL_VERTEX_ARRAY, GL_NORMAL_ARRAY, …). For all other states you use glEnable and glDisable (or glEnableVertexAttribArray and glDisableVertexAttribArray for the generic vertex shader attributes).