Function DrawGouraudSky

Descent3/terrainrender.cpp:1621–1676

Draws the gouraud sky

}
// Draws the gouraud sky
void DrawGouraudSky(void) {
  int t, k, tw;
  float sr, sg, sb, hr, hg, hb;

  g3Point pnt[4], *pntlist[6];
  g3UVL uvls[10];
  if (Terrain_sky.sky_color == Terrain_sky.horizon_color)
    return; // No sense in drawing anything
  rend_SetTextureType(TT_FLAT);
  rend_SetColorModel(CM_RGB);
  rend_SetAlphaType(AT_ALWAYS);
  // figure out colors for sky
  {
    sr = (float)GR_COLOR_RED(Terrain_sky.sky_color) / 255.0;
    sg = (float)GR_COLOR_GREEN(Terrain_sky.sky_color) / 255.0;
    sb = (float)GR_COLOR_BLUE(Terrain_sky.sky_color) / 255.0;
    hr = (float)GR_COLOR_RED(Terrain_sky.horizon_color) / 255.0;
    hg = (float)GR_COLOR_GREEN(Terrain_sky.horizon_color) / 255.0;
    hb = (float)GR_COLOR_BLUE(Terrain_sky.horizon_color) / 255.0;
  }
  for (t = 0; t < MAX_HORIZON_PIECES; t++) {
    tw = (t + 1) % MAX_HORIZON_PIECES;
    pnt[0].p3_vec = Temp_sky_vectors[t][4];
    pnt[0].p3_vecPreRot = Temp_sky_vectors_unrotated[t][4];
    uvls[0].r = sr;
    uvls[0].g = sg;
    uvls[0].b = sb;

    pnt[1].p3_vec = Temp_sky_vectors[tw][4];
    pnt[1].p3_vecPreRot = Temp_sky_vectors_unrotated[tw][4];
    uvls[1].r = sr;
    uvls[1].g = sg;
    uvls[1].b = sb;

    pnt[2].p3_vec = Temp_sky_vectors[tw][5];
    pnt[2].p3_vecPreRot = Temp_sky_vectors_unrotated[tw][5];
    uvls[2].r = hr;
    uvls[2].g = hg;
    uvls[2].b = hb;

    pnt[3].p3_vec = Temp_sky_vectors[t][5];
    pnt[3].p3_vecPreRot = Temp_sky_vectors_unrotated[t][5];
    uvls[3].r = hr;
    uvls[3].g = hg;
    uvls[3].b = hb;

    for (k = 0; k < 4; k++) {
      g3Point *p = &pnt[k];
      p->p3_flags = PF_RGBA | PF_ORIGPOINT;
      g3_CodePoint(p);
      pntlist[k] = p;
      p->p3_uvl = uvls[k];
    }
    g3_DrawPoly(4, pntlist, 0);
  }
}
// Draws the sky textures
void DrawTexturedSky(void) {