DAWN auf ATI R3x0-Karten schneller? [Archiv]

Unregistered

2003-05-22, 09:19:03

Wie kann das sein, dass die Demo, die die überlegenen Fähigkeiten vom NV30 demonstrieren sollte (lange Shader, viele Layer etc.), mit nem Wrapper schneller auf einer Radeon läuft als auf der GeForce FX?

Aber schaut selbst:

http://www.rage3d.com/articles/atidawning/shots/1024x768_4aa16af_1.jpg

Ich weiss, es gibt dazu schon einen Thread im ATI-Forum, aber ich denke, daß das auch andere interessiert.

Unregistered

2003-05-22, 09:24:15

Hier der Link von Rage3d

http://www.rage3d.com/articles/atidawning/

Da steht:

The Dawning of ATI

When I first saw Nvidia’s new GeForce FX Dawn demo I was quite impressed. ATI’s demos done by Alex and the ATI Research crew are of course impressive as well, but the Dawn demo had a certain appeal. Maybe it was the human form, life-like facial expressions, realistic skins tones and texture, or most likely the sexual appeal. So it was disappointing to find out that this magnificent demo would not be able to run on ATI’s DX9 graphic cards. Luckily a group of MIT engineering students were disappointed by the same thing (also rumoured that they were unhappy with Nvidia's image quality and performance) and were up to the task of making it work on ATI hardware (and the brains!). The end result was an opengl wrapper that made the demo run smoothly on ATI hardware. Most impressive!

The following was said about the opengl wrapper:

It runs 15% faster than NV30 on the 9800pro, and it also runs faster than NV35 (we are unable to personally confirm this but a user with both cards and FRAPS could).
Creates higher quality images than the original due to the normalization being done in a fragment program (dp3/rsq/mul) instead of in a normalization cubemap which the FX extensions does directly in hardware
The OpenGL wrapper adds more overhead, as it has to interperet code calls for Nvidia extensions and map them to ATI/ARB extensions, and yet it still runs faster on the ATI card, due to its more sophisticated pixel shader engine.

Krass, wa?!