Hi,
When experimenting with vsync under GNU/Linux, I noticed that
SDL_GL_SWAP_CONTROL was an “OpenGL attribute [] unsupported on this
system”.
(I was using Pygame and first thought it was a pygame- or X11-specific
issue, but then I found out that I could use vsync with Pyglet so it
definitely should have worked).
The bug is due to (AFAICT) an implementation oversight in
video/x11/SDL_x11gl.c: it tries to load ‘glXSwapIntervalMESA’ or
’glXSwapIntervalSGI’ dynamically from ‘/usr/lib/libGL.so.1’, while it
should load them through ‘glXGetProcAddressARB’.
The following tiny patch does just that, and I now get my smooth
scrolling 
What do you think?–
Sylvain
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