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Let SDL calculate the gamma ramp now that X11GAMMA and SDL 1.2 are gone.

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This commit is contained in:
Yamagi Burmeister 2018-07-18 20:39:49 +02:00
parent 1b68da9a0f
commit 5ec3bcdb49
1 changed files with 3 additions and 44 deletions
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47
src/client/refresh/gl1/gl1_sdl.c
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@ -50,57 +50,16 @@ GLimp_GetProcAddress (const char* proc)
return SDL_GL_GetProcAddress ( proc ); return SDL_GL_GetProcAddress ( proc );
} }
/*
* from SDL2 SDL_CalculateGammaRamp, adjusted for arbitrary ramp sizes
* because xrandr seems to support ramp sizes != 256 (in theory at least)
*/
void CalculateGammaRamp(float gamma, Uint16* ramp, int len)
{
int i;
/* Input validation */
if (gamma < 0.0f ){
return;
}
if (ramp == NULL) {
return;
}
/* 0.0 gamma is all black */
if (gamma == 0.0f) {
for (i = 0; i < len; ++i) {
ramp[i] = 0;
}
return;
} else if (gamma == 1.0f) {
/* 1.0 gamma is identity */
for (i = 0; i < len; ++i) {
ramp[i] = (i << 8) | i;
}
return;
} else {
/* Calculate a real gamma ramp */
int value;
gamma = 1.0f / gamma;
for (i = 0; i < len; ++i) {
value = (int) (pow((double) i / (double) len, gamma) * 65535.0 + 0.5);
if (value > 65535) {
value = 65535;
}
ramp[i] = (Uint16) value;
}
}
}
void void
UpdateHardwareGamma(void) UpdateHardwareGamma(void)
{ {
float gamma = (vid_gamma->value); float gamma = (vid_gamma->value);
Uint16 ramp[256]; Uint16 ramp[256];
CalculateGammaRamp(gamma, ramp, 256); SDL_CalculateGammaRamp(gamma, ramp);
if(SDL_SetWindowGammaRamp(window, ramp, ramp, ramp) != 0) { if(SDL_SetWindowGammaRamp(window, ramp, ramp, ramp) != 0)
{
R_Printf(PRINT_ALL, "Setting gamma failed: %s\n", SDL_GetError()); R_Printf(PRINT_ALL, "Setting gamma failed: %s\n", SDL_GetError());
} }
} }