[Bug 32096] drawStridedSlow can be more efficient

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=32096

--- Comment #2 from Henri Verbeet <hverbeet at gmail.com> 2012-10-29 18:57:38 CDT ---
(In reply to comment #0)
> So this bug report is more a way of opening the discussion. I see many options
> to improve the situation:
> 
> a) Tweak the heuristics which detects and fallbacks to drawStridedSlow. If
> necessary implements the needed conversions in software. But this will not
> generates OpenGL function call and will increase performance a bit
> b) Tweak the vertex shader to do the conversion in the vertex shader, I think
> it is our best option
> c) Tweak drawStridedSlow to still rely on vertex array when possible (I have an
> example of code which is doing this. I'm playing WoW with this since 3 days
> without any issue and with a FPS increase of 200%). I don't think that honestly
> it is the good idea.
> d) do something else. Because I did not read anything else than the
> drawStritedSlow function, I may have missed something important.
> 
Well, we have most of that, see e.g. wined3d_buffer_preload() and
shader_glsl_swizzle_to_str(). You should probably figure out why that code
doesn't get used for you. Personally though, I think it's probably more
productive to work on fixing any issues in Mesa / Nouveau for your hardware,
and just use those drivers instead.

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