[quake2] difference between glx and sdl opengl implementation

Anders Storsveen wakko at generation.no
Tue Mar 29 08:12:34 EST 2005

I've been doing a little investigation and I have figured out that the glx  
implementation uses some kind of hwgamma (the one I can set through  
nvidia-settings), and sdl uses some sort of hack. The hwgamma version  
changes instantly when chaning the slider in the video setting, and it  
just changes the gamma (which results in a little more yellowish but still  
crisp picture), the sdl implementation is some sort of hack like in  
brightness so it washes out hte colors and contrasts. If you set an  
insanly high brightness value in sdl you will have no texture at all, just  

however I also did the same thing in windowed mode, and then both seemed  
to use hwgamma, colors and texture of both sdl and glx were similiar. So  
it seems that the SDL implementation has a problem getting the hwgamma  
control in fullscreen. I've tried looking into the code, and I think I  
found the code which handles it, but couldn't figure it out.

would be great with sdl with hwgamma, since I think glx looks best, but  
has a broken mouse for me.

On Fri, 18 Mar 2005 03:51:51 +0100, Brendan Burns  
<brendanburns at comcast.net> wrote:

> This is probably a difference between either a) the bit depth of the
> SDL renderer versus the GLX renderer or b) the alpha of the renderer.
>   Both of these are adjustable through cvars...
> --brendan
> On Mar 17, 2005, at 7:32 PM, Anders Storsveen wrote:
>> I notice that SDL and glx rendering looks different. Its the same
>> difference that used to be between nvidia and 3dfx when in windows.
>> glx looks the way 3dfx did, with its yellow-ish graphics and sdl looks
>> like nvidia did, with more orange/brown colors. I have always liked
>> the glx/3dfx colors better, too bad the mouse is better in SDL ... :/
>> --
>> Using Opera's revolutionary e-mail client: http://www.opera.com/m2/

Anders Storsveen
The Next Generation

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