Function DrawVisMassDriverEffect

Descent3/viseffect.cpp:1653–1801

Draws a long "stick" to represent the mass driver trail

// Draws a long "stick" to represent the mass driver trail
void DrawVisMassDriverEffect(vis_effect *vis, bool f_boss) {
  int i, t, k;
  static int masstrail = -1;

  if (masstrail == -1)
    masstrail = FindTextureName("MassTrail");
  ASSERT(masstrail != -1); // DAJ -1FIX

  vector center_vecs[2];
  g3Point arc_points[32], *pntlist[32];

  center_vecs[0] = vis->pos;
  center_vecs[1] = vis->end_pos;

  vector normvec = center_vecs[1] - center_vecs[0];
  matrix orient;

  vm_NormalizeVector(&normvec);
  vm_VectorToMatrix(&orient, &normvec, NULL, NULL);

  float size = ((float)vis->billboard_info.width) * .25;
  int circle_pieces = 16;

  if (f_boss) {
    size *= 3.0f;
  }

  float mag = vm_VectorDistanceQuick(&vis->pos, &vis->end_pos);
  vector dir_norm = (vis->end_pos - vis->pos) / mag;
  float alpha_norm = (vis->lifeleft / vis->lifetime) * .5;
  int bm_handle = GetTextureBitmap(vis->custom_handle, 0);

  rend_SetAlphaType(AT_SATURATE_TEXTURE);
  rend_SetOverlayType(OT_NONE);
  rend_SetTextureType(TT_LINEAR);
  rend_SetLighting(LS_FLAT_GOURAUD);
  rend_SetZBufferWriteMask(0);
  if (f_boss)
    rend_SetFlatColor(GR_RGB(255, 170, 170));
  else
    rend_SetFlatColor(GR_RGB(200, 200, 255));

  rend_SetAlphaValue(255 * alpha_norm);

  for (i = 0; i < 2; i++) {
    for (t = 0; t < circle_pieces; t++) {
      float norm = (float)t / (float)circle_pieces;
      vector arc_vec = center_vecs[i];

      arc_vec += (orient.uvec * (size / 4) * FixSin(norm * 65536));
      arc_vec -= (orient.rvec * (size / 4) * FixCos(norm * 65536));

      g3_RotatePoint(&arc_points[i * circle_pieces + t], &arc_vec);
      arc_points[i * circle_pieces + t].p3_flags |= PF_UV | PF_RGBA;
    }
  }

  for (k = 0; k < circle_pieces; k++) {