Nalu/Dawn/Dusk on ATI?
- Thread starter Leto
- Start date
Im pretty sure dusk has never been emulated properly.
The only thing stopping dusk and probably even nalu seeming as both can run on a gffx (nalu VERY slowly) is someone spending the time to make a wrapper and with the amount of nvidia specific extensions that would be a sizeable undertaking especially for nalu where it likely is using commands that cant map at all to commands accepted by the radeon so you'd have to think up other ways to achieve the same effect,
The only thing stopping dusk and probably even nalu seeming as both can run on a gffx (nalu VERY slowly) is someone spending the time to make a wrapper and with the amount of nvidia specific extensions that would be a sizeable undertaking especially for nalu where it likely is using commands that cant map at all to commands accepted by the radeon so you'd have to think up other ways to achieve the same effect,
dan2097 said:
No.
Since NVIDIA's "extensions" are way beyond ARB_fragment_program and ATI doesn't support nothing more, there is no way to write a wrapper. Specially on Timbury where I think it uses FP blending (so no way to emulate this with a wrapper) and Clear Sailing where you can't fake vertex texture fetching...
On the other hand, most R400 demos run fine with a GFFX...
Expect of course when they ask for a FP rendering target. But then you use a normal buffer and it runs fine (with some glitches....) The x800 cards don't work with the Dawn wrapper. The reason probably is that the old OpenGL driver doesn't support these new cards. I've written a wrapper for the wrapper, though, which makes it work again. I've sent my wrapper to Rage3D, so that they can update their Dawn/ATI tutorial, but they didn't update it yet.Leto said:
Cant get the Fairy.exe running on my computer (p4&x800xtpe). Maybe it's the x800
I'm not aware of that Dusk would work on ATI, though. jvd, do you have some details?
DegustatoR
Legend
It uses vertex texture fetches for waves simulation so you definately can't run it "just fine" on NV35oddfellow said:
It needs FP16 render targets with FP16 blending and FP16 texturing so it won't work at all.
Mintmaster
Veteran
I think you should spend more time reading his response. He said Dusk and Nalu demos, not Timbury and Clear Sailing.Sigma said:
It's unlikely the Dusk shaders are much more complicated than the Dawn shaders. The Nalu shader uses dynamic branching, but that can be simulated with the stencil buffer (fast) or with cmp instructions (slow).
991060 posted the shader in a thread, and you can see how simple the branching is.
If someone gave me the source code for the Dawn wrapper, I could write a Nalu wrapper in a day or two.
Mintmaster said:
I wonder how will you do that because you have to change states (specially the stencil buffer) and that in a wrapper is kind of very very hard to do. Not to mention that you would have to break the shader apart for each condition. And hope the stencil buffer isn't being used already.... And hope that the instruction count and the limit of 4 texture indirection doesn't create a problem on non NVIDIA cards...
