dedicated_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 <https://www.gnu.org/licenses/old-licenses/gpl-2.0>.
 */

 
#include "../stdafx.h"
 
#include "../gfx_func.h"
#include "../error_func.h"
#include "../network/network.h"
#include "../network/network_internal.h"
#include "../console_func.h"
#include "../genworld.h"
#include "../fileio_type.h"
#include "../fios.h"
#include "../blitter/factory.hpp"
#include "../company_func.h"
#include "../saveload/saveload.h"
#include "../thread.h"
#include "../window_func.h"
#include <iostream>
#include "dedicated_v.h"
 
#if defined(UNIX)
# include <sys/time.h> /* gettimeofday */
# include <sys/types.h>
# include <unistd.h>
# include <signal.h>
# define STDIN 0  /* file descriptor for standard input */

std::atomic<bool> _dedicated_exit_requested;
 
/* Signal handlers */
static void DedicatedSignalHandler(int sig)
{
  _dedicated_exit_requested = true;
  signal(sig, DedicatedSignalHandler);
}
#endif
 
#if defined(_WIN32)
# include <windows.h> /* GetTickCount */
# include <conio.h>
# include <time.h>
# include <tchar.h>
# include "../os/windows/win32.h"
 
static HANDLE _hInputReady, _hWaitForInputHandling;
static HANDLE _hThread; // Thread to close
static std::string _win_console_thread_buffer;
 
/* Windows Console thread. Just loop and signal when input has been received */
static void WINAPI CheckForConsoleInput()
{
  SetCurrentThreadName("ottd:win-console");
 
  for (;;) {
    std::getline(std::cin, _win_console_thread_buffer);
 
    /* Signal input waiting that input is read and wait for it being handled. */
    SignalObjectAndWait(_hInputReady, _hWaitForInputHandling, INFINITE, FALSE);
  }
}
 
static void CreateWindowsConsoleThread()
{
  DWORD dwThreadId;
  /* Create event to signal when console input is ready */
  _hInputReady = CreateEvent(nullptr, false, false, nullptr);
  _hWaitForInputHandling = CreateEvent(nullptr, false, false, nullptr);
  if (_hInputReady == nullptr || _hWaitForInputHandling == nullptr) UserError("Cannot create console event!");
 
  _hThread = CreateThread(nullptr, 0, (LPTHREAD_START_ROUTINE)CheckForConsoleInput, nullptr, 0, &dwThreadId);
  if (_hThread == nullptr) UserError("Cannot create console thread!");
 
  Debug(driver, 2, "Windows console thread started");
}
 
static void CloseWindowsConsoleThread()
{
  CloseHandle(_hThread);
  CloseHandle(_hInputReady);
  CloseHandle(_hWaitForInputHandling);
  Debug(driver, 2, "Windows console thread shut down");
}
 
#endif
 
#include "../safeguards.h"
 
 
static std::unique_ptr<uint8_t[]> _dedicated_video_mem;

bool _dedicated_forks;
 
extern bool SafeLoad(const std::string &filename, SaveLoadOperation fop, DetailedFileType dft, GameMode newgm, Subdirectory subdir, struct LoadFilter *lf = nullptr);
 
static FVideoDriver_Dedicated iFVideoDriver_Dedicated;
 
 
std::optional<std::string_view> VideoDriver_Dedicated::Start(const StringList &)
{
  this->UpdateAutoResolution();
 
  int bpp = BlitterFactory::GetCurrentBlitter()->GetScreenDepth();
  if (bpp != 0) _dedicated_video_mem = std::make_unique<uint8_t[]>(static_cast<size_t>(_cur_resolution.width) * _cur_resolution.height * (bpp / 8));
 
  _screen.width  = _screen.pitch = _cur_resolution.width;
  _screen.height = _cur_resolution.height;
  _screen.dst_ptr = _dedicated_video_mem.get();
  ScreenSizeChanged();
  BlitterFactory::GetCurrentBlitter()->PostResize();
 
#if defined(_WIN32)
  /* For win32 we need to allocate a console (debug mode does the same) */
  CreateConsole();
  CreateWindowsConsoleThread();
  SetConsoleTitle(L"OpenTTD Dedicated Server");
#endif
 
#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
 
  Debug(driver, 1, "Loading dedicated server");
  return std::nullopt;
}
 
void VideoDriver_Dedicated::Stop()
{
#ifdef _WIN32
  CloseWindowsConsoleThread();
#endif
  _dedicated_video_mem = nullptr;
}
 
void VideoDriver_Dedicated::MakeDirty(int, int, int, int) {}
bool VideoDriver_Dedicated::ChangeResolution(int, int) { return false; }
bool VideoDriver_Dedicated::ToggleFullscreen(bool) { return false; }
 
#if defined(UNIX)
static bool InputWaiting()
{
  struct timeval tv;
  fd_set readfds;
 
  tv.tv_sec = 0;
  tv.tv_usec = 1;
 
  FD_ZERO(&readfds);
  FD_SET(STDIN, &readfds);
 
  /* don't care about writefds and exceptfds: */
  return select(STDIN + 1, &readfds, nullptr, nullptr, &tv) > 0;
}
 
#else
 
static bool InputWaiting()
{
  return WaitForSingleObject(_hInputReady, 1) == WAIT_OBJECT_0;
}
 
#endif
 
static void DedicatedHandleKeyInput()
{
  if (!InputWaiting()) return;
 
  if (_exit_game) return;
 
  std::string input_line;
#if defined(UNIX)
  if (!std::getline(std::cin, input_line)) return;
#else
  /* Handle console input, and signal console thread, it can accept input again */
  std::swap(input_line, _win_console_thread_buffer);
  SetEvent(_hWaitForInputHandling);
#endif
 
  /* Remove any trailing \r or \n, and ensure the string is valid. */
  auto p = input_line.find_last_not_of("\r\n");
  if (p != std::string::npos) p++;
  IConsoleCmdExec(StrMakeValid(input_line.substr(0, p)));
}
 
void VideoDriver_Dedicated::MainLoop()
{
  /* Signal handlers */
#if defined(UNIX)
  signal(SIGTERM, DedicatedSignalHandler);
  signal(SIGINT, DedicatedSignalHandler);
  signal(SIGQUIT, DedicatedSignalHandler);
#endif
 
  /* Load the dedicated server stuff */
  _is_network_server = true;
  _network_dedicated = true;
  _current_company = _local_company = COMPANY_SPECTATOR;
 
  /* If SwitchMode is SwitchMode::LoadGame / SwitchMode::StartHeightmap, it means that the user used the '-g' options */
  if (_switch_mode != SwitchMode::LoadGame && _switch_mode != SwitchMode::StartHeightmap) {
    StartNewGameWithoutGUI(GENERATE_NEW_SEED);
  }
 
  this->is_game_threaded = false;
 
  /* Done loading, start game! */
 
  while (!_exit_game) {
    if (!_dedicated_forks) DedicatedHandleKeyInput();
    this->DrainCommandQueue();
 
    this->Tick();
    this->SleepTillNextTick();
 
#if defined(UNIX)
    if (_dedicated_exit_requested) {
      if (_game_mode == GameMode::Normal && _settings_client.gui.autosave_on_exit) DoExitSave();
      _exit_game = true;
    }
#endif
  }
}