changed sky rendering to occur after depthmask polygons, instead of before

[xonotic/darkplaces.git] / palette.c

diff --git a/palette.c b/palette.c
index f95c48914767fe2b74854065c9234894b5793716..24ee2d00851106fa45eb9c07a6f70aff2371c770 100644 (file)
--- a/palette.c
+++ b/palette.c
@@ -85,6 +85,12 @@ void Palette_SetupSpecialPalettes(void)
        int transparentcolor;
        unsigned char *colormap;
        fs_offset_t filesize;
+       union
+       {
+               int i;
+               unsigned char b[4];
+       }
+       u;
 
        colormap = FS_LoadFile("gfx/colormap.lmp", tempmempool, true, &filesize);
        if (colormap && filesize >= 16385)
@@ -154,37 +160,49 @@ void Palette_SetupSpecialPalettes(void)
 
        for (i = 0;i < 256;i++)
                palette_bgra_alpha[i] = 0xFFFFFFFF;
-       palette_bgra_alpha[transparentcolor] = 0;
+       u.i = 0xFFFFFFFF;
+       u.b[3] = 0;
+       palette_bgra_alpha[transparentcolor] = u.i;
 
        for (i = 0;i < 256;i++)
                palette_bgra_font[i] = palette_bgra_complete[i];
        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, d;
 
        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;
+               d = ((contrastboost - 1) * t + 1);
+               if(d == 0)
+                       t = 0; // we could just as well assume 1 here, depending on which side of the division by zero we want to be
+               else
+                       t = contrastboost * t / d;
+               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);
        }
 }
@@ -231,7 +249,7 @@ 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)