View Full Version : glSampleCourageARB

03-11-2002, 04:40 PM
have anyone come across this problem when

wglGetProcAddress("glSampleCourageARB") return NULL value.


i did uses wglGetProcAddress("wglGetExtensionString") and the value returns do include "WGL_ARB_multisampling")

So what's wrong???

The hardware i'm using is Elsa Syn II http://www.opengl.org/discussion_boards/ubb/smile.gif

03-11-2002, 05:18 PM
LOL check out your spelling:



03-11-2002, 06:08 PM
ROFL!! sorry couldnt resist that. http://www.opengl.org/discussion_boards/ubb/smile.gif OpenGL doesnt like it when i try to give it more courage too. http://www.opengl.org/discussion_boards/ubb/wink.gif j/k!


[This message has been edited by SirKnight (edited 03-11-2002).]

03-11-2002, 09:05 PM
Yes, sorry of that mistake.

But i did spell as glSampleCoverageARB
in my program. http://www.opengl.org/discussion_boards/ubb/smile.gif

03-12-2002, 09:24 AM
Have you been able to load any other extensions? I say that because maybe your extension loading code is wack. On the main opengl.org page a few days ago there was a news post about some functions this guy made that will load all extensions your card supports with one function call. Maybe you can try that and see what happens.


03-12-2002, 08:21 PM
I think i have gone through that discussion. However i tried loading other extensions and it just work well. And When i downloaded a software fron nVidia, the software is not able to detect multisampling too.

i start to wonder is it due to the driver or the hardware???

Any comment?? Thank you http://www.opengl.org/discussion_boards/ubb/wink.gif

03-12-2002, 08:31 PM
I'd guess it's the driver. Try opening the driver file in a hex editor and see if you find a "glSampleCoverageARB" string in there at all. That's at least what I would do http://www.opengl.org/discussion_boards/ubb/smile.gif

03-13-2002, 02:24 PM
Thank, but what's a hex editor?

03-13-2002, 02:29 PM
Originally posted by p9931734:
Thank, but what's a hex editor?

Would you be able to do some research on your own before asking questions like this?


03-14-2002, 03:24 AM
Sorry. I'm just shock at the moment i read about it. I'm sure to do it the next time http://www.opengl.org/discussion_boards/ubb/smile.gif

03-14-2002, 03:54 AM
Did you use the WGL_ARB_pixel_format functions to request a pixel format supporting FSAA prior to attempting to fill the glSampleCoverage function pointer?

Not sure if the driver is allowed to report WGL_ARB_multisampling without having a current pixelformat that it can be enabled on, BUT I thought it would be a good question to ask.

Have fun,
-- Jeff

03-14-2002, 05:08 AM
For me the function pointer getīs filled, even if I donīt have got a Pixelformat active, that supports AA.


03-14-2002, 08:07 PM
i did. glSampleCoverageARB are called after the pixel formatting.

Anyway i tried to use a hex editor and realize that there isn't a glSampleCoverageARB function within the driver.(I did manage to find other extensions)

So what's the problem??? since the return string of wglGetExtensionString did return "WGL_ARB_multisampling "

03-14-2002, 09:21 PM
I suppose you should try to update your drivers.