palette.c

   1
   2 #include "quakedef.h"
   3
   4 unsigned int d_8to24table[256];
   5 //byte d_15to8table[32768];
   6 byte host_basepal[768];
   7 byte qgamma[256];
   8 static float vid_gamma = 1.0;
   9
  10 void Palette_Setup8to24()
  11 {
  12         byte *in, *out;
  13         unsigned short i;
  14
  15         in = host_basepal;
  16         out = (byte *) d_8to24table; // d_8to24table is accessed as 32bit for speed reasons, but is created as 8bit bytes
  17         for (i=0 ; i<255 ; i++)
  18         {
  19                 *out++ = *in++;
  20                 *out++ = *in++;
  21                 *out++ = *in++;
  22                 *out++ = 255;
  23         }
  24         d_8to24table[255] = 0; // completely transparent black
  25 }
  26
  27 /*
  28 void    Palette_Setup15to8()
  29 {
  30         byte    *pal;
  31         unsigned r,g,b;
  32         unsigned v;
  33         int     r1,g1,b1;
  34         int             j,k,l;
  35         unsigned short i;
  36
  37         for (i = 0;i < 32768;i++)
  38         {
  39                 r = ((i & 0x001F) << 3)+4;
  40                 g = ((i & 0x03E0) >> 2)+4;
  41                 b = ((i & 0x7C00) >> 7)+4;
  42                 pal = (unsigned char *)d_8to24table;
  43                 for (v = 0, k = 0, l = 1000000000;v < 256;v++, pal += 4)
  44                 {
  45                         r1 = r - pal[0];
  46                         g1 = g - pal[1];
  47                         b1 = b - pal[2];
  48                         j = r1*r1+g1*g1+b1*b1;
  49                         if (j < l)
  50                         {
  51                                 k = v;
  52                                 l = j;
  53                         }
  54                 }
  55                 d_15to8table[i] = k;
  56         }
  57 }
  58 */
  59
  60 void Palette_Gamma ()
  61 {
  62         float   inf;
  63         int             i;
  64
  65         vid_gamma = 1;
  66         if ((i = COM_CheckParm("-gamma")))
  67                 vid_gamma = atof(com_argv[i+1]);
  68
  69         if (vid_gamma == 1) // LordHavoc: dodge the math
  70         {
  71                 for (i = 0;i < 256;i++)
  72                         qgamma[i] = i;
  73         }
  74         else
  75         {
  76                 for (i = 0;i < 256;i++)
  77                 {
  78                         inf = pow((i+1)/256.0, vid_gamma)*255 + 0.5;
  79                         if (inf < 0) inf = 0;
  80                         if (inf > 255) inf = 255;
  81                         qgamma[i] = inf;
  82                 }
  83         }
  84 }
  85
  86 void Palette_Init()
  87 {
  88         byte *pal;
  89         pal = (byte *)COM_LoadMallocFile ("gfx/palette.lmp", false);
  90         if (!pal)
  91                 Sys_Error ("Couldn't load gfx/palette.lmp");
  92         memcpy(host_basepal, pal, 765);
  93         free(pal);
  94         host_basepal[765] = host_basepal[766] = host_basepal[767] = 0; // LordHavoc: force the transparent color to black
  95         Palette_Setup8to24();
  96 //      Palette_Setup15to8();
  97         Palette_Gamma();
  98 }