Function DrawLightningSky

Descent3/terrainrender.cpp:1554–1619

Draws a lightning sky

}
// Draws a lightning sky
void DrawLightningSky(void) {
  int t, k, tw;
  float r, g, b;

  g3Point pnt[4], *pntlist[6];

  rend_SetTextureType(TT_FLAT);
  rend_SetColorModel(CM_RGB);
  rend_SetLighting(LS_GOURAUD);
  rend_SetAlphaType(AT_SATURATE_VERTEX);

  // figure out colors for sky
  r = .8f;
  g = .8f;
  b = 1.0;
  // Draw top part
  for (t = 0; t < MAX_HORIZON_PIECES; t++) {
    tw = (t + 1) % MAX_HORIZON_PIECES;
    pnt[0].p3_vec = Temp_sky_vectors[t][0];
    pnt[0].p3_vecPreRot = Temp_sky_vectors_unrotated[t][0];
    pnt[1].p3_vec = Temp_sky_vectors[tw][1];
    pnt[1].p3_vecPreRot = Temp_sky_vectors_unrotated[tw][1];
    pnt[2].p3_vec = Temp_sky_vectors[t][1];
    pnt[2].p3_vecPreRot = Temp_sky_vectors_unrotated[t][1];

    for (k = 0; k < 3; k++) {
      g3Point *p = &pnt[k];
      p->p3_flags = PF_RGBA | PF_ORIGPOINT;
      g3_CodePoint(p);
      p->p3_a = .3f;
      p->p3_r = r;
      p->p3_g = g;
      p->p3_b = b;
    }
    pntlist[0] = &pnt[0];
    pntlist[1] = &pnt[1];
    pntlist[2] = &pnt[2];
    g3_DrawPoly(3, pntlist, 0);
  }
  // Draw bottom part
  for (int i = 1; i < 5; i++) {
    for (t = 0; t < MAX_HORIZON_PIECES; t++) {
      tw = (t + 1) % MAX_HORIZON_PIECES;
      pnt[0].p3_vec = Temp_sky_vectors[t][i];
      pnt[0].p3_vecPreRot = Temp_sky_vectors_unrotated[t][i];
      pnt[1].p3_vec = Temp_sky_vectors[tw][i];
      pnt[1].p3_vecPreRot = Temp_sky_vectors_unrotated[tw][i];
      pnt[2].p3_vec = Temp_sky_vectors[tw][i + 1];
      pnt[2].p3_vecPreRot = Temp_sky_vectors_unrotated[tw][i + 1];
      pnt[3].p3_vec = Temp_sky_vectors[t][i + 1];
      pnt[3].p3_vecPreRot = Temp_sky_vectors_unrotated[t][i + 1];

      for (k = 0; k < 4; k++) {
        g3Point *p = &pnt[k];
        p->p3_flags = PF_RGBA | PF_ORIGPOINT;
        g3_CodePoint(p);
        p->p3_a = .3f;
        p->p3_r = r;