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Old 10-23-07, 10:48 AM   #1
JaXXoN
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Default Diviation in 100.14.23 README concerning OpenGL Viewport Maximums

Hi!

Chapter 14 of the nvidia driver README at
http://us.download.nvidia.com/XFree8...hapter-14.html
says:

Quote:
Originally Posted by README
The maximum OpenGL viewport size depends on the hardware used,
and is described by the following table. If an OpenGL window is larger
than the maximum viewport, regions beyond the viewport will be blank.

OpenGL Viewport Maximums in Xinerama
GeForce GPUs before GeForce 8: 4096 x 4096 pixels
GeForce 8 and newer GPUs: 8192 x 8192 pixels
Quadro: as large as the Xinerama desktop
I have a triple head, dual GeForce 7800GTX xinerama setup, so per README,
it should be possible to have windows with 3D content up to 4096 pixels.

However, i'm experiencing the following effect:

A glxgears window at 3969x1024 pixel shows 580 frames per second.
When now enlarging the window width by one pixel to 3970, the
frame rate drops to 0.7 FPS - seems like the driver falls back
to software rendering. The nividia-bug-report.log (attached)
doesn't show any hints what could be the problem.

Can anybody please confirm that you can have bigger windows
i.e. 4800x1200 pixel with a triple head dual GeForce 8000 series card
xinerama setup?

regards

Bernhard
Attached Files
File Type: zip nvidia-bug-report.log.zip (29.8 KB, 112 views)
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Old 10-23-07, 03:44 PM   #2
AaronP
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Default Re: Diviation in 100.14.23 README concerning OpenGL Viewport Maximums

You're probably running out of video memory.
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Old 10-23-07, 07:30 PM   #3
JaXXoN
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Default Re: Diviation in 100.14.23 README concerning OpenGL Viewport Maximums

Quote:
Originally Posted by AaronP
You're probably running out of video memory.
Thanks for the quick response!

Is there something in can do in order to check if this
is the root cause? (i.e. /proc, /sys or some command).

regards

Bernhard
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Old 10-23-07, 11:14 PM   #4
AaronP
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Default Re: Diviation in 100.14.23 README concerning OpenGL Viewport Maximums

Nope, I'm afraid there's currently no mechanism to get the amount of video memory in use.
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Old 10-24-07, 06:19 AM   #5
JaXXoN
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Default Re: Diviation in 100.14.23 README concerning OpenGL Viewport Maximums

Hi!

Here's an additional Info: while enlarging the window width by one
pixel results in a enormous drop in frame rate, re-sizing the window
to 3969x1160 pixel (window height enlarged by 136 pixel) results in 510 FPS.

regards

Bernhard
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Old 01-09-08, 09:23 AM   #6
JaXXoN
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Default Re: Diviation in 100.14.23 README concerning OpenGL Viewport Maximums

Just to let you know: with two 8800GT cards i can now run glxgears across
all three monitors at a resolution of 4800x1200 pixels with 4130 FPS.
(This didn't worked about a year ago with two 8800GTX cards).

X-Plane 8.60 is also running well at full resolution, but the increase
(from 3840x1024) to the native display resolution (1600x1200 each)
causes a notable frame rate drop (which was to be sort of expected
since now the cards need to render about 50% more pixels).

regards

Bernhard
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