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casey
Site Admin
Joined: 18 Dec 2004
Posts: 1768
Location: Seattle
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 Posted: Mon Feb 25, 2008 9:39 am Post subject: Page border artifacts? |
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Are these artifacts an understood phenomenon?
I have a GeForce 8600M GT. I don't know if the app is running in its preferred mode or not... is there a way to determine that when you're running, Sean?
Anyways I figured on this card there shouldn't be any artifacts, but it looks like there are, so I was wondering if they were known problems or not.
- Casey |
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sean
Joined: 01 Feb 2005
Posts: 1392
Location: Kirkland WA
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Posted: Mon Feb 25, 2008 4:21 pm Post subject: |
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| Try toggling trilinear (shift-T) and see if it goes away. If it does, it's almost certainly the gradient thing, which would mean it's NOT running in the preferred mode for some reason. (That's easy to test, by looking at the landscape and hitting non-shifted-t and seeing if you see the page boundaries everywhere.) Not sure why you wouldn't get the preferred mode, though, since the 8600 was what I developed it on. |
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casey
Site Admin
Joined: 18 Dec 2004
Posts: 1768
Location: Seattle
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Posted: Mon Feb 25, 2008 6:52 pm Post subject: |
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| sean wrote: | | Try toggling trilinear (shift-T) and see if it goes away. If it does, it's almost certainly the gradient thing, which would mean it's NOT running in the preferred mode for some reason. |
It does go away if I hit shift-T.
| sean wrote: | | (That's easy to test, by looking at the landscape and hitting non-shifted-t and seeing if you see the page boundaries everywhere.) |
If I look at the landscape and hit t I see all the page boundaries (like a grid).
| sean wrote: | | Not sure why you wouldn't get the preferred mode, though, since the 8600 was what I developed it on. |
If I get a chance I will compile the program and step through to see if it's not getting the extension from wgl.
- Casey |
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sean
Joined: 01 Feb 2005
Posts: 1392
Location: Kirkland WA
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Posted: Mon Feb 25, 2008 7:55 pm Post subject: |
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Yep, the unshifted-t page boundary artifact is the trilinear-without-gradients mipmapping problem.
| casey wrote: | | If I get a chance I will compile the program and step through to see if it's not getting the extension from wgl. |
IIRC, the extension is handled entirely from GLSL (there's a bunch of GLSL #ifdefs). So there's no easy way to debug it since I did it that way. (It needs to be rewritten to have two separate versions of the shaders without ifdefs, and see if/why the "good" one doesn't compile.) |
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