[AD] Re: [AGL] Feature request: screen-gamma manipulation functions

[Robert Jr Ohannessian <rohannessian@xxxxxxxxxx>]

This is something that should be placed in Allegro, if at all. 
Personally, I'm weary of games that change the global gamma setting, and 
then crash to leave the messed up gamma ramp.

Steffen Hein wrote:

> I would like to ask if you could implement some gamma-manipulation functions 
> in AllegroGL. These are platform-dependent, that's why I think they belong 
> here.
>
> The gamma can be changed using SetDeviceGammaRamp under Windows (see 
> http://talika.eii.us.es/~titan/oglfaq/ chapter 18.08 and 16.05 for examples; 
> Vooodoo-cards have their own function, newer cards support the above 
> function).
>
> Gamma can be changed with XF86VidModeSetGamma on X-based platforms (in case 
> HAVE_XF86_VIDMODE is #defined).
>
> On platforms not supporting gamma changes, the alleggl-function should return 
> FALSE or an error-code so that the coder can fall-back on not-so-elegant 
> options (for example brightening up lightmaps or things like that).
>
>  ~sth
>
>
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