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Old 04-07-06, 07:07 PM   #1
mold
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Default OpenGL with windows larger than 4096 pixels...Slow!

Well, I'm pretty excited about support for OpenGL windows larger than 4096 pixels, since I can now game across all three screens (big dream of mine for ages ), but when I do, it works, but it's EXTREMELY slow.

Are there any options I should enable or disable to speed things up? Games play just fine at normal resolutions (1600x1200 and the like).
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Old 04-07-06, 09:02 PM   #2
netllama
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Default Re: OpenGL with windows larger than 4096 pixels...Slow!

Its quite possible that your hardware isn't capable of rendering that much OpenGL screen real-estate. Unless you've got a G7x GPU (and even then, its questionable how big you can go without experiencing noticable performance degradation as compared to smaller resolutions), 1600x1200 is likely the upper end. If you have further questions, please generate and post an nvidia-bug-report.log, along with information on which game(s) you're playing, and performance numbers.

Thanks,
Lonni
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Old 04-07-06, 10:36 PM   #3
mold
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Default Re: OpenGL with windows larger than 4096 pixels...Slow!

Well, my test game has been Neverwinter Nights, since it detects resolutions really well. I've been having some mouse issues with my other games on all screens for some reason. Doom 3 seems to have the same issue though. I really don't know how to get performance numbers though, I'm afraid.

I've got two 7800 GTXs, and I can do 3200x1200 in TwinView with no issues on one, so I'm hoping it's not a resource limitation. It is in Xinerama for three screens though.

There don't seem to be any errors though, that I can see, just the extremely poor performance (takes a few seconds after moving the mouse for it to warp to it's new location).

Thanks.
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Old 04-07-06, 11:00 PM   #4
netllama
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Default Re: OpenGL with windows larger than 4096 pixels...Slow!

I'd be curious whether this reproduces with anything other than NWN, as this could be a NWN or wine bug.

Is performance any better if you setup TwinView for two displays, and Xinerama for the third (to tie them all together)?

If you switch to 1280x1024 for each display, does the problem persist?

Thanks,
Lonni
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Old 04-08-06, 07:52 PM   #5
mold
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Default Re: OpenGL with windows larger than 4096 pixels...Slow!

If I lower the resolution on all three screens, I have no lag, but I do get a very odd effect. NWN blanks out all three screens, centers itself on my right monitor, and then only plays on my center and right screens (both on card 1). If I do TwinView+Xinerama at 4800x1200, I get the same effect, but I also get the slow graphics, as well.

This is the Linux client though, not emulated to my knowledge.

Oddly, in Doom 3, I can set the resolution up to 3969x1200 with no problems. As soon as I set it to anything over 3970x1200, it loses graphics. At first I thought it was just going really slowly, as it doesn't crash, but it never shows anything after that point. I may try this again with the old driver though, since that's not over 4096.

Cedega crashes for me when it loads games right now. Not sure if that's FC5 or the drivers though. I need to play with that more though.
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Old 04-09-06, 11:31 AM   #6
mold
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Default Re: OpenGL with windows larger than 4096 pixels...Slow!

I was able to load EverQuest under Cedega, at 3840x1024. It loaded all the way into the game, but crashed a few seconds after I tried moving around, and Cedega thereafter refused to load.

Once again, not over 4096 pixels, but I thought it might be useful. Before this driver, I've never been able to load anything greater than 3200x1200, and then only in TwinView mode, so I'm not really sure what all to report.
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Old 04-11-06, 04:51 PM   #7
netllama
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Default Re: OpenGL with windows larger than 4096 pixels...Slow!

I believe that we've reproduced a more generic case of this problem (using a trivial OpenGL app, instead of NVN), and have opened bug 222651.

Thanks,
Lonni
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Old 04-11-06, 06:38 PM   #8
JaXXoN
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Default Re: OpenGL with windows larger than 4096 pixels...Slow!

Hi!

I'm experiencing the same issue:

glxgears at 3969x300: 1445 FPS
glxgears at 3970x300: 3 FPS

Means: one pixel bigger and the performance drops significantly.
Looks like fallback to software rendering.

UT2K4 gaming resolution is 3840x1024, BTW.

regards

Bernhard
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