PowerVR VS 3.0 Demo!!!
- Thread starter radiATIon
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Ante P said:
I am not planning to make the app NV40 compatible but I do need to make sure its nice and educational (I work for DevRel afterall) and this means I really should have done more caps checking. If I had done a caps check for supported render targets we would have known that R16F was not supported, if I had checked vertex texture compatibility we'd have know that R16G16F was not supported. So I plan to add in both these checks and relevant error messages when I have the time.
K-
I could provide some of my 6800 GT, which I clocked at ULTRA level 400/550 - If anyone with a X800 could try the Deferrend Shading demo!?
Deferrend Shading: 1600x1200x32 , no AA, no AF, zbuffer 24s8, pure HW device, 32 bit textures, all lights enabled
27 fps (doesn't seem to much GPU limited, because in 512x512 it is running at 28-30 fps)
Cloth Demo(default mode): 1600x1200x32 , no AA, no AF, zbuffer 24s8, pure HW device
110 fps (doesn't seem GPU limited, because in 512x512 it is also running at 110 fps)
Deferrend Shading: 1600x1200x32 , no AA, no AF, zbuffer 24s8, pure HW device, 32 bit textures, all lights enabled
27 fps (doesn't seem to much GPU limited, because in 512x512 it is running at 28-30 fps)
Cloth Demo(default mode): 1600x1200x32 , no AA, no AF, zbuffer 24s8, pure HW device
110 fps (doesn't seem GPU limited, because in 512x512 it is also running at 110 fps)
^Ante P said:
you can forget the results for now. It seems every time i change the resolution i need to re-enable all lights again so the results are not accurate
update:
ok the more accurate results:
640*480=45/46fps
800*600=33/34fps
1024*768=21/22fps
1280*960=16/17fps
1600*1200=12fps
tb said:
Cloth is unlikely to be fillrate limited since it uses a very simple PS for the final scene since else it would run terribly slow on the ref rast and on release that was all that was publically available. The complex PS which does the cloth physics model runs at such a low "fixed" resolution that it unlikely to show up. Its also not that likely to be VS limited unless the vertex texturing is really slow again due to the low number of nodes.
Hence to increase the load (more vertex texturing and more pixels for the complex physics based PS) you would need to either :
- Increase the number of passes per frame (more ping pong renders as part of the physics update)
- Increase the number of noses in the cloth grid, hence more vertices in the cloth thus more PS work for simulating the physics as well.
The second option could make the cloth unstable since the acting forces might become too big if the nodes get closer together... so would require tweaking to avoid an exploding cloth.
Changing the resolution only influences the final display which uses a simple PS which only applies a single filtered texture, nothing fancy at all and thus unlikely to introduce a PS bottleneck.
K-
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