| From: | Hans-Joerg Frieden |
| Date: | 22 Aug 2001 at 12:20:16 |
| Subject: | Re: [3DWorld] Voodoo compatibility and stuff |
On Tuesday 21 August 2001 18:36, Michal Wozniak wrote:
> Hi,
>
> Does V3 can handle nonrectangular textures?
Yes, to a certain degree. All Warp3D drivers up to now support it, but the
Permedia2 is the only chip that fully implements it. The Voodoo has some
trouble, since it requires textures to adhere to certain aspect ratios (8x1,
4x1, 1x1, 1x4 and 1x8).
This essentially means that a 16x2 texture works, but a 32x2 texture doesn't
and needs to be software emulated by replicating the image.
> And one question about it's speed. Is it really
> that much faster than Permedia? I'm asking because
> recently I wrote a small intro that displays 20 spinning
> additive fullscreen planes and it was SLOOOW (10fps?).
> Is it going to be faster on V3? And How much?
Yes, it's generally vastly superior to the Permedia2. In your case, this
means that there is alpha blending and fill rate involved. Alpha blending
requires a framebuffer readback per pixel. In the P2's case this slows down
the chip to 50%. The Voodoo's fill rate is much higher. If you want you can
send me that demo and I will run it on the voodoo.
> BTW. Have anyone on this list (Frieden bros?) seen
> my demo from ASM01? On permedia it was quite slow
> in some parts (slower than in others;). How was is on V3?
No, I haven't seen it. Can you point me to an URL where I can download it?
Best regards,