modified lhrandom (and hence the QC random builtin) to never return the

[xonotic/darkplaces.git] / palette.c

diff --git a/palette.c b/palette.c
index 85cd474f86ed049a837a388e5af7578f2c4ee62c..86ffa5a4a20f0e0a57fbfb2713f8db70be8eb5e9 100644 (file)
--- a/palette.c
+++ b/palette.c
@@ -169,30 +169,36 @@ void Palette_SetupSpecialPalettes(void)
        palette_bgra_font[0] = 0;
 }
 
-void BuildGammaTable8(float prescale, float gamma, float scale, float base, unsigned char *out, int rampsize)
+void BuildGammaTable8(float prescale, float gamma, float scale, float base, float contrastboost, unsigned char *out, int rampsize)
 {
        int i, adjusted;
        double invgamma;
+       double t;
 
        invgamma = 1.0 / gamma;
        prescale /= (double) (rampsize - 1);
        for (i = 0;i < rampsize;i++)
        {
-               adjusted = (int) (255.0 * (pow((double) i * prescale, invgamma) * scale + base) + 0.5);
+               t = i * prescale;
+               t = contrastboost * t / ((contrastboost - 1) * t + 1);
+               adjusted = (int) (255.0 * (pow(t, invgamma) * scale + base) + 0.5);
                out[i] = bound(0, adjusted, 255);
        }
 }
 
-void BuildGammaTable16(float prescale, float gamma, float scale, float base, unsigned short *out, int rampsize)
+void BuildGammaTable16(float prescale, float gamma, float scale, float base, float contrastboost, unsigned short *out, int rampsize)
 {
        int i, adjusted;
        double invgamma;
+       double t;
 
        invgamma = 1.0 / gamma;
        prescale /= (double) (rampsize - 1);
        for (i = 0;i < rampsize;i++)
        {
-               adjusted = (int) (65535.0 * (pow((double) i * prescale, invgamma) * scale + base) + 0.5);
+               t = i * prescale;
+               t = contrastboost * t / ((contrastboost - 1) * t + 1);
+               adjusted = (int) (65535.0 * (pow(t, invgamma) * scale + base) + 0.5);
                out[i] = bound(0, adjusted, 65535);
        }
 }
@@ -239,7 +245,7 @@ void Palette_Load(void)
        scale = bound(0.01, scale, 10.0);
        base = bound(0, base, 0.95);
 
-       BuildGammaTable8(1.0f, gamma, scale, base, texturegammaramp, 256);
+       BuildGammaTable8(1.0f, gamma, scale, base, 1, texturegammaramp, 256);
 
        palfile = (unsigned char *)FS_LoadFile ("gfx/palette.lmp", tempmempool, false, &filesize);
        if (palfile && filesize >= 768)