Function DemoFrame

Descent3/demofile.cpp:1158–1302

uint8_t DemoLastOpcode = 0;

void DemoFrame() {
  uint8_t opcode;
  if (Demo_flags != DF_PLAYBACK)
    return;
  if (!Demo_first_frame) {
    Demo_frame_ofs = 0;

    if (Demo_make_movie) {
      DoScreenshot();
    }
    // This code slows down demo playback
    if (!Demo_play_fast) {

      float tdelta = timer_GetTime();
      // if(Gametime<Demo_next_frame)
      //{
      //	mprintf(0,"!%.3f!",Demo_next_frame-Gametime);
      //}

      while ((Gametime + Demo_frame_ofs) < Demo_next_frame) {
        Demo_frame_ofs = timer_GetTime() - tdelta;
      }
    }
  } else {
    // mprintf(0,"This is the first frame in the demo playback!(%f)\n",Demo_next_frame);
    Gametime = Demo_next_frame;
    Demo_frame_time = 0;
    Demo_first_frame = false;
  }
  int exit_loop = 0;
  do {
    // Read one opcode at a time, and dispatch the proper function to read the rest of the data
    // Keep going until we hit a new frame
    try {
      opcode = cf_ReadByte(Demo_cfp);
      // mprintf(0,"Demo ocode: %d\n",opcode);
    } catch (...) {
      // End of file, so we're done playing the demo
      mprintf(0, "End of demo file!");
      strcpy(Old_demo_fname, Demo_fname);
      DemoAbort();
      // Do some cool stuff here, like end of demo stats or exit to the main menu
      if (Demo_looping) {
        Game_interface_mode = GAME_DEMO_LOOP;
        strcpy(Demo_fname, Old_demo_fname);
      } else {
        Game_interface_mode = GAME_POST_DEMO;
      }
      return;
    }
    switch (opcode) {
    case DT_NEW_FRAME:
      DemoReadNewFrame();
      exit_loop = 1;
      break;
    case DT_OBJ:
      DemoReadObj();
      break;