Am Sonntag, 13. September 2009 18:03:30 schrieb Csaba Hruska:
Hi! I've upgraded my haskell programs to opengl 2.4.0.1 and I've noticed massive (3X) slowdown. I did only type fixes on code. Is it normal?
No, it isn't. The only circumstances I can think of where you could perhaps notice some slowdown are using an Haskell interpreter *and* massively using OpenGL's deprecated immediate mode (glBegin/glEnd a.k.a. renderPrimitive). But even then a factor of 3 would be surprising, because stripping away the newtypes for the basic OpenGL types shouldn't be that costly. A compiler like GHC should "compile away" those newtypes, so there should be no difference in the performance then. Could you post your old code and your new code where you observed the slowdown, please? Cheers, S.