Function RenderTextFade

Descent3/TelcomEffectsRender.cpp:292–406

  tce->age += frametime;
}
void RenderTextFade(tceffect *tce, float frametime, int xoff, int yoff, bool ok_to_render) {
  if (!ok_to_render)
    return;
  ASSERT(tce->type == EFX_TEXT_FADE);
  ASSERT(tce->text_buffer);
  // See if we have any events waiting
  tTCEvent evt;
  while (PopEvent(tce, &evt)) {
    switch (evt.id) {
    case TEVT_SCROLLDOWN:
      if (tce->textinfo.scroll_d) {
        // mprintf(0,"Down Baby Down!\n");
        tce->textinfo.line_index++;
      }
      break;
    case TEVT_SCROLLUP:
      if (tce->textinfo.line_index > 0) {
        // mprintf(0,"Up Baby Up!\n");
        tce->textinfo.line_index--;
      }
      break;
    case TEVT_GAINFOCUS: {
      // mprintf(0,"Text %d Gain Focus\n",tce-TCEffects);
    } break;
    case TEVT_LOSTFOCUS: {
      // mprintf(0,"Text %d Lost Focus\n",tce-TCEffects);
    } break;
    }
  }

  if (tce->speed == 0)
    tce->speed = 0.0001f;
  float amount = tce->age * (255.0 / tce->speed);
  uint8_t alpha;
  if (tce->flags == TC_TEXTF_IN) {
    // fade in, but not fade out
    tce->alpha += amount;
    if (tce->alpha > 255.0f) {
      tce->alpha = 255.0f;
    }
    alpha = tce->alpha;
  } else if (tce->flags == TC_TEXTF_OUT) {
    // fade out, but not fade in
    tce->alpha -= amount;
    if (tce->alpha < 0.0f) {
      tce->alpha = 0.0f;
    }
    alpha = tce->alpha;
  } else {
    // fade in, then fade out (if alpha is negative, then we are fading out)
    if (tce->alpha < 0.0f) {
      tce->alpha += amount;
      alpha = (-tce->alpha);
      if (tce->alpha > 0.0f) {
        // we're done fading out
        tce->alpha = 1234.0f;
        alpha = 0;
      }