[Bug 22478] Major performance drop in King's Bounty games with shadows enabled

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=22478





--- Comment #6 from Roderick Colenbrander <thunderbird2k at gmail.com>  2010-04-25 15:18:48 ---
Alright here are my results. I ran the game at 1024x768 @ 32-bit and I disabled
the in game option multisampling which by default was set to 2 which made the
game quite a bit slower and made performance testing trickier. In all cases I
tested in the tutorial map (so inside a castle on a horse I guess) and I moved
around a bit in the room.

Without ClearSurface FBO patch:
* 27-30fps with shadows=none
* 20-25fps with shadows=high

With FBO patch:
* 35-40fps with shadows=none (yes, really I got better performance but more
later)
* 20-25fps with shadows=high

At least on my system performance is the same with and without the patch when
shadows are set to high. Perhaps there is a 1-2fps difference but I really
can't say as there is no timedemo mode and I time you make different movements.
Without shadows performance is actually quite a bit better for some reason.

One thing I should mention is that usually after a few seconds (when
shadows=none with fbo patch) I receive some GL_INVALID_OPERATION errors from
glsl_shader.c 4572. Can it be that perhaps you are also seeing such error lines
after the patch? When I get them the performance drops a lot to about 10fps.

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