null_v.cpp

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/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */
 
#include "../stdafx.h"
#include "../gfx_func.h"
#include "../blitter/factory.hpp"
#include "../saveload/saveload.h"
#include "../window_func.h"
#include "null_v.h"
 
#include "../safeguards.h"
 
static FVideoDriver_Null iFVideoDriver_Null;
 
std::optional<std::string_view> VideoDriver_Null::Start(const StringList &parm)
{
#ifdef _MSC_VER
  /* Disable the MSVC assertion message box. */
  _set_error_mode(_OUT_TO_STDERR);
  _CrtSetReportMode(_CRT_ASSERT, _CRTDBG_MODE_FILE);
  _CrtSetReportFile(_CRT_ASSERT, _CRTDBG_FILE_STDERR);
#endif
 
  this->UpdateAutoResolution();
 
  this->ticks = GetDriverParamInt(parm, "ticks", 1000);
  _screen.width  = _screen.pitch = _cur_resolution.width;
  _screen.height = _cur_resolution.height;
  _screen.dst_ptr = nullptr;
  ScreenSizeChanged();
 
  /* Do not render, nor blit */
  Debug(misc, 1, "Forcing blitter 'null'...");
  BlitterFactory::SelectBlitter("null");
  return std::nullopt;
}
 
void VideoDriver_Null::Stop() { }
 
void VideoDriver_Null::MakeDirty(int, int, int, int) {}
 
void VideoDriver_Null::MainLoop()
{
  uint i;
 
  for (i = 0; i < this->ticks; i++) {
    ::GameLoop();
    ::InputLoop();
    ::UpdateWindows();
  }
 
  /* If requested, make a save just before exit. The normal exit-flow is
   * not triggered from this driver, so we have to do this manually. */
  if (_settings_client.gui.autosave_on_exit) {
    DoExitSave();
  }
}
 
bool VideoDriver_Null::ChangeResolution(int, int) { return false; }
 
bool VideoDriver_Null::ToggleFullscreen(bool) { return false; }