progs/samples/tkmap.c

   1
   2 enum {
   3     COLOR_BLACK = 0,
   4     COLOR_RED,
   5     COLOR_GREEN,
   6     COLOR_YELLOW,
   7     COLOR_BLUE,
   8     COLOR_MAGENTA,
   9     COLOR_CYAN,
  10     COLOR_WHITE
  11 };
  12
  13 static float RGBMap[9][3] = {
  14     {0, 0, 0},
  15     {1, 0, 0},
  16     {0, 1, 0},
  17     {1, 1, 0},
  18     {0, 0, 1},
  19     {1, 0, 1},
  20     {0, 1, 1},
  21     {1, 1, 1},
  22     {0.5, 0.5, 0.5}
  23 };
  24
  25 static void SetColor(int c)
  26 {
  27     if (glutGet(GLUT_WINDOW_RGBA))
  28         glColor3fv(RGBMap[c]);
  29     else
  30         glIndexf(c);
  31 }
  32
  33 static void InitMap(void)
  34 {
  35     int i;
  36
  37     if (rgb)
  38         return;
  39
  40     for (i = 0; i < 9; i++)
  41             glutSetColor(i, RGBMap[i][0], RGBMap[i][1], RGBMap[i][2]);
  42 }
  43
  44 static void SetFogRamp(int density, int startIndex)
  45 {
  46     int fogValues, colorValues;
  47     int i, j, k;
  48     float intensity;
  49
  50     fogValues = 1 << density;
  51     colorValues = 1 << startIndex;
  52     for (i = 0; i < colorValues; i++) {
  53         for (j = 0; j < fogValues; j++) {
  54             k = i * fogValues + j;
  55             intensity = (i * fogValues + j * colorValues) / 255.0;
  56             glutSetColor(k, intensity, intensity, intensity);
  57         }
  58     }
  59 }
  60
  61 static void SetGreyRamp(void)
  62 {
  63     int i;
  64     float intensity;
  65
  66     for (i = 0; i < 255; i++) {
  67         intensity = i / 255.0;
  68         glutSetColor(i, intensity, intensity, intensity);
  69     }
  70 }
  71