openGL driver tech question

mot · Sep 23, 2004, 03:34 PM

I'm doing an aplication that need to be frame rate constant.
I have discover that when I do a glTeximage2D with data=NULL and time goes from 0.07ms to 20.0ms with texture from 2x2 to 2048x2048, and the same test on nvidia time is always less that 0.01ms.

Also there's a stange case when texture is 256x256 and time is bigger than a 512x512 one.

After a bit reverse of atioglxx.dll I discover that drivers make some time of conversion with texture data, even with data=NULL. I have been able to bypass this process, and now with my patched atioglxx.dll time are as small as with Nvidia except the 256x256 case that still take 3ms.

I can find where driver make the special process, but I haven seen that it depends on "texture quality" control panel option,... and when I select max quality I get nvidia times even with 256x256......

Anyone knows what drivers do with the diferent "texture quality" modes ??
Does omegaDriver modify openGL driver ??

Thx.

The_Neon_Cowboy · Sep 23, 2004, 04:44 PM

Quote:

Originally Posted by mot

I'm doing an aplication that need to be frame rate constant.
I have discover that when I do a glTeximage2D with data=NULL and time goes from 0.07ms to 20.0ms with texture from 2x2 to 2048x2048, and the same test on nvidia time is always less that 0.01ms.

Also there's a stange case when texture is 256x256 and time is bigger than a 512x512 one.

After a bit reverse of atioglxx.dll I discover that drivers make some time of conversion with texture data, even with data=NULL. I have been able to bypass this process, and now with my patched atioglxx.dll time are as small as with Nvidia except the 256x256 case that still take 3ms.

I can find where driver make the special process, but I haven seen that it depends on "texture quality" control panel option,... and when I select max quality I get nvidia times even with 256x256......

Anyone knows what drivers do with the diferent "texture quality" modes ??
Does omegaDriver modify openGL driver ??

Thx.

I don't know man, but what I do know is reverse engineering ATI drivers and making alterations to the files then selfs might be illegal at best. I woundn't be advertiseing that... Modifying settings and customizing is all the moders do.

did the modification you made have any affect on performance? such as in opengl games?

Perfect Reason · Sep 23, 2004, 07:02 PM

Yeah. I wanna know that too

.. Especially in cs ^^

PolygonParadox · Sep 24, 2004, 11:21 AM

Quote:

Originally Posted by The_Neon_Cowboy

I don't know man, but what I do know is reverse engineering ATI drivers and making alterations to the files then selfs might be illegal at best. I woundn't be advertiseing that... Modifying settings and customizing is all the moders do.

did the modification you made have any affect on performance? such as in opengl games?

Kinda contradicted yourself in that post. LOL

"Its baaaaaaaad, verrrrrry baaaaaaad, ......but on the other hand if it speeds up my games what the hell"!?!?!?! Check to see if your moral compass isn't next to a magnet of some kind. LOL

j/k

As far as the law goes, anyone can do anything with the drivers as long as

A. The person/persons involved do not benefit from it in any financial way.

and

B. The company of the said software/hardware product are not affected in a negative way either financially or reputaion-wise.

Reverse-engineering has resulted in MANY jobs over the years in the tech industry. (Myself included) You go to a company with an idea to improve their products and they'll be begging you to stay.