Function DrawSphere

Descent3/fireball.cpp:2153–2232

TODO: MTS: not used? Draws a sphere with the appropriate texture. If texture=-1, then uses rgb as colors

// TODO: MTS: not used?
// Draws a sphere with the appropriate texture.  If texture=-1, then uses rgb as colors
void DrawSphere(vector *pos, float r, float g, float b, float alpha, float size, int texture, uint8_t saturate) {
  static vector sphere_vecs[16][16];
  static int first = 1;
  g3Point sphere_points[16][16], *pntlist[4], draw_points[4];
  int bm_handle = -1;
  ddgr_color color = GR_RGB(r * 255, g * 255, b * 255);

  int i, t;

  if (size < 0)
    return;
  if (first) {
    first = 0;
    // Create a unit sphere
    int increment = 65536 / 16;
    for (i = 0; i < 16; i++) {
      for (t = 0; t < 16; t++) {
        matrix tempm;
        angle pitch, heading;
        pitch = i * increment;
        heading = t * increment;

        vm_AnglesToMatrix(&tempm, pitch, heading, 0);
        sphere_vecs[i][t] = tempm.fvec;
      }
    }
  }
  rend_SetZBufferWriteMask(0);
  draw_points[0].p3_u = 0;
  draw_points[0].p3_v = 0;
  draw_points[1].p3_u = 1.0 + ((ps_rand() % 100) / 500.0);
  draw_points[1].p3_v = 0;
  draw_points[2].p3_u = 1.0 + ((ps_rand() % 100) / 500.0);
  draw_points[2].p3_v = 1.0 + ((ps_rand() % 100) / 500.0);
  draw_points[3].p3_u = 0;
  draw_points[3].p3_v = 1.0 + ((ps_rand() % 100) / 500.0);

  if (texture == -1) {
    rend_SetTextureType(TT_FLAT);
    rend_SetOverlayType(OT_NONE);
    rend_SetColorModel(CM_RGB);
    rend_SetLighting(LS_NONE);
    rend_SetFlatColor(color);
    rend_SetAlphaType(AT_CONSTANT);
    rend_SetAlphaValue(alpha * 255.0);
  } else {
    rend_SetTextureType(TT_LINEAR);
    rend_SetOverlayType(OT_NONE);
    rend_SetColorModel(CM_MONO);
    rend_SetLighting(LS_NONE);
    rend_SetAlphaType(AT_SATURATE_TEXTURE);
    rend_SetAlphaValue(alpha * 255.0);
    bm_handle = GetTextureBitmap(texture, 0);
  }

  for (i = 0; i < 16; i++) {
    for (t = 0; t < 16; t++) {
      vector temp_vec = *pos + (sphere_vecs[i][t] * size);