src/video/null_v.cpp

   1 /*
   2  * This file is part of OpenTTD.
   3  * 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.
   4  * 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.
   5  * 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/>.
   6  */
   7
   8 /** @file null_v.cpp The video driver that doesn't blit. */
   9
  10 #include "../stdafx.h"
  11 #include "../gfx_func.h"
  12 #include "../blitter/factory.hpp"
  13 #include "../saveload/saveload.h"
  14 #include "../window_func.h"
  15 #include "null_v.h"
  16
  17 #include "../safeguards.h"
  18
  19 /** Factory for the null video driver. */
  20 static FVideoDriver_Null iFVideoDriver_Null;
  21
  22 std::optional<std::string_view> VideoDriver_Null::Start(const StringList &parm)
  23 {
  24 #ifdef _MSC_VER
  25         /* Disable the MSVC assertion message box. */
  26         _set_error_mode(_OUT_TO_STDERR);
  27         _CrtSetReportMode(_CRT_ASSERT, _CRTDBG_MODE_FILE);
  28         _CrtSetReportFile(_CRT_ASSERT, _CRTDBG_FILE_STDERR);
  29 #endif
  30
  31         this->UpdateAutoResolution();
  32
  33         this->ticks = GetDriverParamInt(parm, "ticks", 1000);
  34         _screen.width  = _screen.pitch = _cur_resolution.width;
  35         _screen.height = _cur_resolution.height;
  36         _screen.dst_ptr = nullptr;
  37         ScreenSizeChanged();
  38
  39         /* Do not render, nor blit */
  40         Debug(misc, 1, "Forcing blitter 'null'...");
  41         BlitterFactory::SelectBlitter("null");
  42         return std::nullopt;
  43 }
  44
  45 void VideoDriver_Null::Stop() { }
  46
  47 void VideoDriver_Null::MakeDirty(int, int, int, int) {}
  48
  49 void VideoDriver_Null::MainLoop()
  50 {
  51         uint i;
  52
  53         for (i = 0; i < this->ticks; i++) {
  54                 ::GameLoop();
  55                 ::InputLoop();
  56                 ::UpdateWindows();
  57         }
  58
  59         /* If requested, make a save just before exit. The normal exit-flow is
  60          * not triggered from this driver, so we have to do this manually. */
  61         if (_settings_client.gui.autosave_on_exit) {
  62                 DoExitSave();
  63         }
  64 }
  65
  66 bool VideoDriver_Null::ChangeResolution(int, int) { return false; }
  67
  68 bool VideoDriver_Null::ToggleFullscreen(bool) { return false; }