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lobstah
01-28-2002, 03:48 AM
Hi,
I'm getting different results, actually bugs, between Full Acceleration and No Acceleration on my M$ win98 machine. For example, when I gluUnProject the results with no acceleration are correct but when I use full acceleration I get drastically wrong results.

Any ideas?

dorbie
01-28-2002, 06:00 AM
This is what the feature is for. It's obviously a bug in the hardware driver. When you dial down to no acceleration you effectively use a 'safe' software OpenGL implementation.

lobstah
01-28-2002, 07:14 AM
Hi Dorbie,
Thanks for the confirmation; this is what I thought as there are other machines I tried and did not encounter the same results.

Is there a way to coerce No Accleration in an OpenGL app, even when the user chooses to Full Acceleration from the video settings?

Eric
01-28-2002, 07:27 AM
Simply enumerate the available pixel formats and choose one that is not accelerated.

I posted some code enabling you to just do that a while ago. Search the forums for posts from me (use the Exact Name search, it's faster !) with the keyword "software".

Regards.

Eric

lobstah
01-28-2002, 07:41 AM
Will do Eric!

Thanks for the info..

lobstah...

Eric
01-29-2002, 04:31 AM
Just for reference:
http://www.opengl.org/discussion_boards/ubb/Forum2/HTML/001818.html

Regards.

Eric

lobstah
01-29-2002, 12:17 PM
Hi Eric,

Thanks for the reference! I'll be giving this a go in a couple of days.

Again, many thanks.

lobstah...