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Old 04-10-04, 11:18 AM   #1
Subbiah
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Default Graphics card and Display method

Hi,

My requirement is

1940x1200 and 1280x768 resolution supported dual head DVI card.

Each display will have RGB Digital camera image area of 75% of screen.
remaining 25 for controlls. The images are coming at 30 Frames per second.

My Target system is Redhat Linux 7.2 with XFree86 4.3.0.

Can any one suggest me the Graphics adoptor and the X programing method to achive this requirment. ( Like OpenGL 2D Rendering or SDL libraries etc..).

This will be helpful for me to start my work.

Thanks.
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Old 04-12-04, 05:54 PM   #2
LordMorgul
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Default Re: Graphics card and Display method

The GeForce 4 TI series cards should support what you need, the choice between the models should be made on whether you require high 3D performance (their 2D performance should be very similar). I run a TI4400 at up to 1920x1440 (60Hz), dual headed. If you are working primarily with images this should be a fine card.

1940x1200 is a non-standard resolution, I have never used or tried this.. if you are concerned that it is possible on this card I will investigate for you (X can in fact create any resolution you desire.. you just may not be able to display it ALL on the monitor at once).

The nVIDIA drivers should still support Red Hat 7.2, but I think driver versions up to at least 41.91 should be fine.
There are known issues with the OpenGL libraries with older Red Hat systems, you should be aware of the dynamic loader caused problems mentioned in the driver readme (search the text readme for dlopen).
The latest driver (1.0-5336) readme is available here. The driver archives page has the older drivers if you need them, and the readmes are probably still on the nVIDIA ftp (where this readme comes from).
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Last edited by LordMorgul; 04-12-04 at 06:21 PM.
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Old 04-17-04, 06:55 AM   #3
Subbiah
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Default Re: Graphics card and Display method

Thanks for your suggestion. Does the 2D and 3D performance are same?
75% of screen content are changing at 30 Frameper Second speed? Will the Open GL support these speeds?

Reg the Resolution, I can go to 1920x1200 and 1280x768. Will the native driver allow me to display these resoltions? I tried one old Nvidia TNT Riva2 card with Driver frm Nvidia site. It does not supported the 1280x768 resolution. I forced the XF86Config-4 to go that resolution. But I got only panned window. Not for fullscreen.

But the same config file related settings are working in Matrox card ( Driver section alone get changed. remaining are same).
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Old 04-17-04, 03:43 PM   #4
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Default Re: Graphics card and Display method

Quote:
Originally Posted by Subbiah
I tried one old Nvidia TNT Riva2 card with Driver frm Nvidia site. It does not supported the 1280x768 resolution. I forced the XF86Config-4 to go that resolution. But I got only panned window. Not for fullscreen.
1280x768 should work with the TNT2 too. I use squashed screens like 1600*600 with it.

You need to insert this line in Section "Monitor"

Modeline "1280x768" x 1280 1344 1504 1728 768 771 781 812

where

x = 1728 * Hfreq
Hfreq = 812 * Vfreq (Framerate)

e.g.
x = 105 for 75Hz(V)/61kHz(H)

And select this mode (and only this) in Section "Screen"

Modes "1280x768"
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Old 04-17-04, 03:49 PM   #5
LordMorgul
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Default Re: Graphics card and Display method

The speeds will depend highly on what loads are on the system, and what is being rendered. Between the ti4400 and ti4600 there is a significant 3D difference.. and there are several 'versions' of each card (different speed ram). The ti4800 can be AGP8X for instance. I do not know whether the cards will be fast enough for your work -- if the cpu load is rather low then most likely, if it is extremely high then perhaps not. These cards are faster than the TNT2 by an unbelievable margin.

For reference, my ti4400 in agp4x runs full screen Quake3 in 1600x1200 resolution at maximum quality over 100fps average -- this is a Pentium4 2.0Ghz i850e machine.
I will check whether I can force these resolutions soon.
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Old 04-18-04, 03:38 AM   #6
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Default Re: Graphics card and Display method

This may be helpful to you.
http://xtiming.sourceforge.net/cgi-bin/xtiming.pl

I was able to run 1936x1200 (monitor rates were not happy with 1940x). 1280x768 didn't quite work.. but I did not have too long to test alot of refresh rates.

You may not be aware of this, but X can load with virtual resolutions that are larger than what the actual hardware displays. When you use that feature you can scroll the desktop area around the virtual space. This could be used to create any mode, even if the exact mode was not shown by the monitor (for instance, I did load 1940x1200 and scroll those 4 pixels).
The option used (in the screen section of the X config) is:
Virtual xsize ysize
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