[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 #20 from Roderick Colenbrander <thunderbird2k at gmail.com>  2010-04-30 12:52:32 ---
Just for testing I added a patch to fix the shader compile issue the nvidia
drivers report errors about. When using that patch in combination with the
stretch_rect_fbo patch I get the same performance with and without the
ClearSurface patch, so I must have used that patch (better call it hack since
it renamed tmp0.xyz in the shader to tmp0.xy) when I did the performance
testing.

I haven't had that much time yet to investigate the performance issue but it at
least seems to be related to context_attach_surface_fbo. I moved the
context_fbo bind, context_attach_surface_fbo and an unbind line to the end of
the function, so it wouldn't affect rendering and it caused a similar
performance drop, so it might be this one. I haven't investigated it more yet.

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