Re: [Dri-devel] tdfx & 32bit textures

[<ra...@ra...>]

On  7 Dec, Daryll Strauss scribbled:
-> On Thu, Dec 07, 2000 at 03:47:51PM -0800, ra...@ra... wrote:
->> On  7 Dec, Brian Paul scribbled:
->> 
->> ->> screen is 16bpp - but that shouldnt change the texture depth should it?
->> ->> on my nvidia cards it's happy doign 32bit textures and the framebuffer
->> ->> and backbuffers being in 16bpp :) or is 3dfx hardware incapable of doing
->> ->> 32bpp textures when the framebuffer depth is 16? i just tested and ti
->> ->> does work in 24bpp - but not 16bpp (didnt think that screen depth woudl
->> ->> affect texture depth)?
->> -> 
->> -> It does.  You can only use 32-bit texels when your screen is running
->> -> at 32bpp, as far as I understand it.
->> 
->> ewwwwwwwwwwww - nasty. ok - different from sgi boxes i've seen and
->> nvidia :) yuk yuk. ok - i'll have to make sure people know about this -
->> i've had enquiries on the horrid quality on voodoo's before.. i needed
->> to check myself  boefre looking deeper :(
->> 
->> -> Bill White: if I've got that wrong please let me know!
->> 
->> if it's possible can we get 32bpp textures to work in 16bpp - is it just
->> like this because its actually a hardware limitation - or is it just
->> because the drivers arent fully fledged yet and dont' support that?
-> 
-> Actually, I think it is more of a driver bug. We check the depth of the
-> screen early on to decide if we're using the old 16bpp mode or 32bpp
-> mode. I think we should allow 32bpp textures on V5's even when the
-> screen is 16bpp.

aaaaaaaaaaah ok.. so it's basically a problem that will be fixed given a
little time .. ok - cool.. no problems.. :) now i still have to figure
out why gl on the voodoo is so much slower than nvidia.. i havent been
able to narrow it down to any calls except:
                 glBegin(GL_QUADS);
                  glTexCoord2d(dtx,  dty);  glVertex2d(x1, y1);
                  glTexCoord2d(dtxx, dty);  glVertex2d(x2, y1);
                  glTexCoord2d(dtxx, dtyy); glVertex2d(x2, y2);
                  glTexCoord2d(dtx,  dtyy); glVertex2d(x1, y2);
                  glEnd();

the more of that the card does the slower it gets...  regardless if
blending or dithering is enabled.

-- 
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The Rasterman (Carsten Haitzler)    ra...@ra...     ra...@va...
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