I couldn't set brightness to over some 5 or 6 in the slider.
I think it was caused by either an update of xorg or an update of fglrx... well, anyways.. I tracked the problem to SDL_SetGamma (made a test program, which showed that it wasn't working)
In the end I found a testgamma.c in SDL-1.2.9 sources where I stealt this block of code:
Code: Select all
void CalculateGamma(double gamma, Uint16 *ramp)
{
int i, value;
gamma = 1.0 / gamma;
for ( i=0; i<256; ++i ) {
value = (int)(pow((double)i/256.0, gamma)*65535.0 + 0.5);
if ( value > 65535 ) {
value = 65535;
}
ramp[i] = (Uint16)value;
}
}
Code: Select all
void SDLWindow::setGamma(float gamma) {
/*HECK THIS NEEDED THIS*/
Uint16 ramp[256];
CalculateGamma(gamma, ramp);
int result = SDL_SetGammaRamp(ramp, ramp, ramp);
...
Just informing, so that, if it occurs to someone else they can update their code too, or maybe you (devs) could add this to CVS ? (No, I'm not a guru with graphics things, and I'd need some explanation myself here of this)