[fixed] OpenGL problem

matich · Post by **matich** » Thu Jun 05, 2008 4:17 pm

Hello,
I have problems with OpenGL:
Some demos doesn't work correctly (shows 1 frame per 30-40 sec.).

Buggy demos:
- 02.Quake3Map.exe
- 04.Movement.exe
- 07.Collision.exe
- 08.SpecialFx.exe
- 13.RenderToTexture.exe

My system:
CPU - Celeron 2.4 GHz
MotherBoard - ASUS p4p800-x
RAM - 512 MB
Video - ATI Radeon 9550 128mb
Audio - Creative SB Audigy SE
WinXP Pro SP2
ATI Catalyst 8.5

// sorry for my poor english

Dorth · Post by **Dorth** » Thu Jun 05, 2008 7:12 pm

check to see if the demo uses NPOT (non power of two) textures. If so, try changing that. If it fixes your issue, then it's a known bug of the most recent Irrlicht release, if not, please tell so ^^

hybrid · Post by **hybrid** » Thu Jun 05, 2008 8:11 pm

Could you please post the output on the console (Irrlicht version, OpenGL version etc) when running one of those slow examples? We did test the version on a dozen systems before making the release, and no one saw this problem. But since many people seem to be affected I guess that there are drivers which claim to be OpenGL 2.0 without supporting all the features...
If you can recompile the library please try to change line 421 in COpenGLExtensionHandler to return only the FeatureAvailable boolean. This should cure the symptom.

Halifax · Post by **Halifax** » Thu Jun 05, 2008 11:46 pm

If you can recompile the library please try to change line 421 in COpenGLExtensionHandler to return only the FeatureAvailable boolean. This should cure the symptom.

Could you be a little more specific? I am using the SVN and I see nothing to do with FeatureAvailable[] around line 421. I am guessing that line is in the place in Irrlicht 1.4.1.

Dorth · Post by **Dorth** » Fri Jun 06, 2008 1:59 am

Sadly, I can't test just now, my computer that is affected (the old one with the old card

) is virus infected up to the neck and has been for 2-3 days now, so it's off until I have a day or 2 to clean it. And I can't test on any of my other comps, they don't have the probs, having either more recent cards or way older ones.

-Edit after Halifax's answer-
This was a reply to hybrid

I brought the bug up a while ago and for that matter, probably should have documented and offered a patch for it...

Halifax · Post by **Halifax** » Fri Jun 06, 2008 2:53 am

Well yeah I have noticed this problem even with the SVN trunk. OpenGL renders insanely slow, while DX9 runs smooth as ever. So I am looking to get this fixed with what hybrid suggested above.

hybrid · Post by **hybrid** » Fri Jun 06, 2008 7:21 am

Yes, in trunk it's line 470, change to
return (FeatureAvailable[IRR_ARB_texture_non_power_of_two]);

matich · Post by **matich** » Fri Jun 06, 2008 3:37 pm

Could you please post the output on the console

Code: Select all

Irrlicht Engine version 1.4.1
Microsoft Windows XP Professional Service Pack 2 (Build 2600)
Using renderer: OpenGL 2.1.7537
ATI Radeon 9550 / X1050 Series: ATI Technologies Inc.
OpenGL driver version is 1.2 or better.
GLSL version: 1.3
Loaded shader: scripts/common.shader for scripts/common.shader
Loaded shader: scripts/models.shader for scripts/models.shader
Loaded shader: scripts/e7.shader for textures/e7/e7walldesign01b
Loaded texture: textures/e7/e7walldesign01b.jpg
Loaded texture: textures/e7/e7steptop2.jpg
Loaded texture: textures/e7/e7dimfloor.jpg
Loaded texture: textures/e7/e7brickfloor01.jpg
Loaded texture: textures/e7/e7bmtrim.jpg
Loaded texture: textures/e7/e7sbrickfloor.jpg
Loaded texture: textures/e7/e7brnmetal.jpg
Loaded texture: textures/e7/e7beam02_red.jpg
Loaded texture: textures/e7/e7swindow.jpg
Loaded texture: textures/e7/e7bigwall.jpg
Loaded texture: textures/e7/e7panelwood.jpg
Loaded texture: textures/e7/e7beam01.jpg
Loaded texture: textures/gothic_floor/xstepborder5.jpg
Loaded texture: textures/liquids/lavahell.jpg
Loaded texture: textures/e7/e7steptop.jpg
Loaded texture: textures/gothic_trim/metalblackwave01.jpg
Loaded texture: textures/stone/pjrock1.jpg
Loaded texture: models/mapobjects/timlamp/timlamp.tga
Loaded shader: scripts/sfx.shader for textures/sfx/flame1side
Loaded texture: models/mapobjects/gratelamp/gratetorch2.jpg
Loaded texture: models/mapobjects/gratelamp/gratetorch2b.tga
Loaded mesh: 20kdm2.bsp
Needed 35ms to create OctTree SceneNode.(456 nodes, 10684 polys)

Then it freezes for 30-40 seconds, and then works very slowly

PS: The same demo from version 1.4 works well.
I have this problem only with 1.4.1

If you can recompile the library please try to change line 421 in COpenGLExtensionHandler to return only the FeatureAvailable boolean. This should cure the symptom.

BIG thanks, it works.

Halifax · Post by **Halifax** » Fri Jun 06, 2008 8:08 pm

hybrid wrote:Yes, in trunk it's line 470, change to
return (FeatureAvailable[IRR_ARB_texture_non_power_of_two]);

Yup that fixed it, now it works amazingly.

hybrid · Post by **hybrid** » Fri Jun 06, 2008 8:24 pm

Damn it, this really sucks. As said, OpenGL 2.x requires support for the NPOT extension. But it doesn't have to be supported in hardware. And ATI cards got several reports about bad NPOT hardware support - grrr. However, it's nice that they don't expose the NPOT extension string. So we might have to publish a 1.4.2 very soon

Dorth · Post by **Dorth** » Sat Jun 07, 2008 10:32 pm

Sorry to hear it

But at the very least, the bug is isolated now... Great work on that ^^