Function SetScreenMode

Descent3/game.cpp:921–1112

int Low_vidmem = 0;

void SetScreenMode(int sm, bool force_res_change) {
  static int old_sm = SM_NULL;
  static int rend_width = 0, rend_height = 0;
  rendering_state rs;

  if (sm == SM_CINEMATIC) {
    // force cinematic to menu
    sm = SM_MENU;
  }

  if (Dedicated_server)
    return;

  if (old_sm == sm && !force_res_change)
    return;

  //	close down any systems previously opened and that must be closed (like software->hardware, etc.)
  //	make sure renderer is initialized
  //	also set any preferred renderer states.
  if (sm == SM_NULL) { // || (sm == SM_CINEMATIC && Renderer_type == RENDERER_OPENGL)) {
    if (rend_initted) {
      rend_Close();
      rend_initted = 0;
    }
  } else if (sm == SM_CINEMATIC) { // && (Renderer_type == RENDERER_OPENGL || Renderer_type == RENDERER_DIRECT3D)) {
    if (rend_initted) {
      rend_Close();
      rend_initted = 0;
    }
  }
  else {
    int scr_width, scr_height, scr_bitdepth;

    if (sm == SM_GAME) {
      scr_width = Video_res_list[Game_video_resolution].width;
      scr_height = Video_res_list[Game_video_resolution].height;
      scr_bitdepth = Render_preferred_bitdepth;
    } else {
      scr_width = FIXED_SCREEN_WIDTH;
      scr_height = FIXED_SCREEN_HEIGHT;
      scr_bitdepth = 32;
    }

    if (!rend_initted) {

      Render_preferred_state.width = scr_width;
      Render_preferred_state.height = scr_height;
      Render_preferred_state.bit_depth = scr_bitdepth;

      rend_initted = rend_Init(PreferredRenderer, Descent, &Render_preferred_state);
      rend_width = rend_height = 0;
    } else {

      // If bitdepth changed but not initting, switch bitdepth
      if (Render_preferred_state.bit_depth != scr_bitdepth) {
        Render_preferred_state.bit_depth = scr_bitdepth;
        rend_SetPreferredState(&Render_preferred_state);
      }