View Full Version : glDrawArrays: Voodoo2>20fps Geforce2<10fps. whhATT??!

02-20-2002, 04:23 PM

In my computer game, I use a LOT of primitive data (> 4500 GL_QUADS); and since my env looks like a swiss cheese, I have to render them all, w/out doing any hidden/cull tests for further anims (no, bsp won't help.).
They are pre-rendered in a VertexArray, and the display routine basically consists of a single glDrawArrays (GL_QUADS, 0, ca.18000);

The init is dynamical; I can select the libGL.so on runtime.
The X<->GL init goes straight-forward with SDL stuff.


Once setup, it runs on my voodoo2 (XF86 4.1, SDL 1.2, Mesa) with a nearly-depressing 20 fps. I took it to two friends of mine, both w/ same cpus as mine (athlon 700MHz), one w/ GeForce2, one w/Erazor3(<-is that right?), both running the NVidia drivers. On both, the framerate drops under 10 fps at the worst!!! (on the two NVidia systems, it doesn't make a difference whether run in Fullscreen or not)


Do I by any chance pipe glDrawArrays not directly to the graphics hw, but via X instead? If so, how do i turn it OFF? How do I analyze this?
[glDrawArrays produces roughly 1M traffic per call; see above: 18000 primitives * 64b alignment.]
On the other hand, the above may be completely wrong...(NO IDEA!!)


I am desparately working on this for one week now. Although this topic would as well fit into the forums of Nvidia, OpenGL, SDL, and XFree86, I grasp for every help I can get...

02-20-2002, 11:59 PM
first, why loading dynamically libGL.so ? in all the cases, you use it, no ?

You use a voodoo2, then with Mesa. For nvidia cards, avoid using nvidia !
have they installed nvidia linux drivers ?
does AGP enabled ? for a long time, i though that AGP won't speed up a lot my app until I use AGP and now it's 2 at 3 more fast !

concerning your voodoo2. i have one (and even 2 in SLI) before. i uses xfree 3.3.6 and it was really correct.


02-22-2002, 04:00 AM
send the source or at least executable,
I do have an old Voodoo2 in my Linux box
+ GF2 AGP, I can run a test for you, plus
drop an eye at the src if provided...