Function DrawVisRainDrop

Descent3/viseffect.cpp:1083–1140

Draws a raindrop on the players windshield

// Draws a raindrop on the players windshield
void DrawVisRainDrop(vis_effect *vis) {
  float norm_time;
  float time_live = Gametime - vis->creation_time;
  float size = vis->size;

  int visnum = vis - VisEffects;
  int bm_handle;
  fireball *fb = &Fireballs[vis->id];

  norm_time = time_live / vis->lifetime;

  if (norm_time >= 1)
    norm_time = .99999f; // don't go over!

  size *= (1 - (norm_time / 2));

  bm_handle = fb->bm_handle;

  float val;
  if (norm_time > .5)
    val = 1.0 - ((norm_time - .5) / .5);
  else if (norm_time < .1)
    val = norm_time / .1;
  else
    val = 1.0;

  rend_SetAlphaValue(val * .4 * 255);
  rend_SetOverlayType(OT_NONE);
  rend_SetWrapType(WT_CLAMP);
  rend_SetLighting(LS_NONE);

  // Set position
  vector pos;

  if (vis->id == RAINDROP_INDEX) {
    rend_SetZBufferState(0);
    rend_SetAlphaType(AT_SATURATE_TEXTURE);
    rend_SetAlphaValue(val * .4 * 255);

    pos = Viewer_object->pos;
    pos += Viewer_object->orient.rvec * vis->pos.x;
    pos += Viewer_object->orient.uvec * vis->pos.y;
    pos += Viewer_object->orient.fvec * vis->pos.z;
    g3_DrawRotatedBitmap(&pos, 0, size, (size * bm_h(bm_handle, 0)) / bm_w(bm_handle, 0), bm_handle);
    rend_SetZBufferState(1);
  } else {
    rend_SetAlphaType(AT_SATURATE_TEXTURE);
    rend_SetAlphaValue(val * .2 * 255);
    rend_SetZBufferWriteMask(0);
    pos = vis->pos;
    ASSERT(!((vis->end_pos.x == 0.0) && (vis->end_pos.y == 0.0) && (vis->end_pos.z == 0.0)));
    g3_DrawPlanarRotatedBitmap(&pos, &vis->end_pos, 0, size, (size * bm_h(bm_handle, 0)) / bm_w(bm_handle, 0),
                               bm_handle);
    rend_SetZBufferWriteMask(1);
  }

  rend_SetWrapType(WT_WRAP);
}