Re: radeon / r200 texture tiling

[Alex D. <ale...@gm...>]

On Tue, 08 Feb 2005 20:38:51 +0100, Roland Scheidegger
<rsc...@hi...> wrote:
> Ok, I was FINALLY able to come up with something for texture tiling
> which seems to work - this was very very annoying, it _almost_ worked
> literally within minutes, but I needed a lot of time until it finally
> did really work.
> I needed to convert back the drivers to use a multi-byte upload scheme
> again (they did this years ago until it was abandoned for a simpler
> method), since if the blitter auto-tiles the textures on upload color
> format and texture pitch need to match the exact texture properties (at
> least I was unable to make it work otherwise).
> Also, there are tons of special cases for small textures in the drm,
> which I don't like but couldn't avoid.
> I could not make it work for texture rectangles, I think at least on
> r200 microtiling for that case should work, but it didn't. Well I don't
> think it's important.
> It is only tested with "normal" 16-bit and 32-bit RGB/RGBA textures, in
> theory all other formats should probably work too I hope. I lack a good
> test, tests/manytex and redbook/mipmap are a bit too simple (and you
> can't see if the tiling is actually correct...). 8-bit formats should
> work too, if I got the math correctly...
> Also, there seem to be some minor differences between r100 and r200
> chips as far as macro tiling is concerned (didn't have much time to test
> on r100 though), and for the heck of it I couldn't figure out what that
> second micro-tile bit is good for on r100.
> 
> Quake3 got about a 15% boost on a 9000pro, and 11% on a 7200 sdr, if the
> highest texture setting/trilinear/32bit was used. Well, compressed
> textures are still faster :-).
> 
> For the drm, I've also included Andreas Stenglein's cube map patch for
> the r100 (since this needs a version bump as well).
> I've only attached the -core version, I actually plan to do a non-core
> version too, but I've noticed the non-core version does no longer seem
> to get all fixes the core version does. So am I the only one who still
> checks things in for that version? In that case I'll immediately stop
> touching it...
> 
> Roland
> 

Nice work Roland!

Alex