[Super-tux-devel] FPS debug

[Ricardo C. <ri...@ae...>]

Hey,
 The game is producing differences in the gameplay between machines that can 
keep different FPS, it is even noticeable the difference in the gameplay 
between the GL and SDL backends.
 I hope this little patch can help in the debugging. Use the Q and S keys to 
decrease the FPS (with the --debug-mode parameter).

 Anyway, I've already tried to hack in the source to make Tux movements to 
obey to the differences in the FPS. The position of Tux is calculated by:

pplayer->base.x= pplayer->base.x+ pplayer->base.xm * frame_ratio;
pplayer->base.y = pplayer->base.y + pplayer->base.ym * frame_ratio;

being x/y, the current position and xm/ym, the current velocity. frame_ratio 
is the result of get_frame_ratio(&pplayer->base);

 This is fine, but the velocity calculation is made by:
pplayer->base.xm = pplayer->base.xm + WALK_SPEED;
 Shouldn't it be something like:
pplayer->base.xm = pplayer->base.xm + WALK_SPEED * frame_ratio;
?

Just wondering...
Ricardo Cruz

-- 
The first sign of maturity is the discovery that the volume knob also turns to 
the left.