Display Lists and vertex arrays...

RZ · 2001-08-08T18:18:35

Hi I’m trying to speed up the rendering part of my engine with the use of display lists or vertex arrays. To see the performance difference between normal ( glBegin(GL_TRIANGLES) ), display list and vertex arrays I made 3 different versions of the engine, and took away all collision detection and other stuff. Now the thing is that I didn’t get any performance improvement at all using VA or display lists. In fact using display list gave a worse result than using the glBegin(GL_TRIANGLES).. and between the VA version and the normal version there was no difference in performance at all. I cant figure out why display lists and VA isn’t faster than glBegin… In the VA version I only have a couple of function calls (glDrawElements) and in the normal version there are lot of function calls(glBegin(GL_TRIANGLES)).. the VA version should be faster.. I have tried change resolution and number of triangles to be drawn but the result is always the same..VA and normal version has the same performance and display list version is a bit slower… Does anyone have a clue why the VA version and display list version isn’t faster than the normal version? My computer is an Athlon 600, GeForce2 Thanks

NeHe Productions Affiliates

Started by RZ August 06, 2001 02:13 PM

12 comments, last by RZ 22 years, 8 months ago

122

Author

August 08, 2001 11:07 AM

I have tried that already.. its not a fillrate problem.
It seems I just have to live with this problem..

Anonymous

August 08, 2001 12:02 PM

You aren''t swapping buffers, are you ? If you do, remove it, since it will synchronize you to the refresh frequency of your screen, that''s not very good for performance measures... And remove any glClear().

Parveen Kaler

122

August 08, 2001 12:05 PM

Check this Siggraph course by Mark Kilgard. You probably want to look at the Tuning your Opengl Application chapter. It''s a couple years old but still pretty useful.

http://reality.sgi.com/blythe/sig99/advanced99/notes/node343.html

122

Author

August 08, 2001 06:18 PM

Thanks Parveen Kaler...
I had a quick look at it and it seem to be some good information there

Display Lists and vertex arrays...

This topic is closed to new replies.

Popular Topics

Recommended Tutorials

Display Lists and vertex arrays...

This topic is closed to new replies.

Popular Topics

Recommended Tutorials

Reticulating splines