text: /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
  
    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.
  
    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely, subject to the following restrictions:
  
    1. The origin of this software must not be misrepresented; you must not
       claim that you wrote the original software. If you use this software
       in a product, an acknowledgment in the product documentation would be
       appreciated but is not required.
    2. Altered source versions must be plainly marked as such, and must not be
       misrepresented as being the original software.
    3. This notice may not be removed or altered from any source distribution.
  */
  #include "./SDL_internal.h"
  
  #if defined(__WIN32__)
  #include "core/windows/SDL_windows.h"
  #endif
  
  /* Initialization code for SDL */
  
  #include "SDL.h"
  #include "SDL_bits.h"
  #include "SDL_revision.h"
  #include "SDL_assert_c.h"
  #include "events/SDL_events_c.h"
  #include "haptic/SDL_haptic_c.h"
  #include "joystick/SDL_joystick_c.h"
  
  /* Initialization/Cleanup routines */
  #if !SDL_TIMERS_DISABLED
  # include "timer/SDL_timer_c.h"
  #endif
  #if SDL_VIDEO_DRIVER_WINDOWS
  extern int SDL_HelperWindowCreate(void);
  extern int SDL_HelperWindowDestroy(void);
  #endif
  
  
  /* The initialized subsystems */
  #ifdef SDL_MAIN_NEEDED
  static SDL_bool SDL_MainIsReady = SDL_FALSE;
  #else
  static SDL_bool SDL_MainIsReady = SDL_TRUE;
  #endif
  static SDL_bool SDL_bInMainQuit = SDL_FALSE;
  static Uint8 SDL_SubsystemRefCount[ 32 ];
  
  /* Private helper to increment a subsystem's ref counter. */
  static void
  SDL_PrivateSubsystemRefCountIncr(Uint32 subsystem)
  {
      int subsystem_index = SDL_MostSignificantBitIndex32(subsystem);
      SDL_assert(SDL_SubsystemRefCount[subsystem_index] < 255);
      ++SDL_SubsystemRefCount[subsystem_index];
  }
  
  /* Private helper to decrement a subsystem's ref counter. */
  static void
  SDL_PrivateSubsystemRefCountDecr(Uint32 subsystem)
  {
      int subsystem_index = SDL_MostSignificantBitIndex32(subsystem);
      if (SDL_SubsystemRefCount[subsystem_index] > 0) {
          --SDL_SubsystemRefCount[subsystem_index];
      }
  }
  
  /* Private helper to check if a system needs init. */
  static SDL_bool
  SDL_PrivateShouldInitSubsystem(Uint32 subsystem)
  {
      int subsystem_index = SDL_MostSignificantBitIndex32(subsystem);
      SDL_assert(SDL_SubsystemRefCount[subsystem_index] < 255);
      return (SDL_SubsystemRefCount[subsystem_index] == 0) ? SDL_TRUE : SDL_FALSE;
  }
  
  /* Private helper to check if a system needs to be quit. */
  static SDL_bool
  SDL_PrivateShouldQuitSubsystem(Uint32 subsystem) {
      int subsystem_index = SDL_MostSignificantBitIndex32(subsystem);
      if (SDL_SubsystemRefCount[subsystem_index] == 0) {
        return SDL_FALSE;
      }
  
      /* If we're in SDL_Quit, we shut down every subsystem, even if refcount
       * isn't zero.
       */
      return (SDL_SubsystemRefCount[subsystem_index] == 1 || SDL_bInMainQuit) ? SDL_TRUE : SDL_FALSE;
  }
  
  void
  SDL_SetMainReady(void)
  {
      SDL_MainIsReady = SDL_TRUE;
  }
  
  int
  SDL_InitSubSystem(Uint32 flags)
  {
      if (!SDL_MainIsReady) {
          SDL_SetError("Application didn't initialize properly, did you include SDL_main.h in the file containing your main() function?");
          return -1;
      }
  
      /* Clear the error message */
      SDL_ClearError();
  
      if ((flags & SDL_INIT_GAMECONTROLLER)) {
          /* game controller implies joystick */
          flags |= SDL_INIT_JOYSTICK;
      }
  
      if ((flags & (SDL_INIT_VIDEO|SDL_INIT_JOYSTICK))) {
          /* video or joystick implies events */
          flags |= SDL_INIT_EVENTS;
      }
  
  #if SDL_VIDEO_DRIVER_WINDOWS
  	if ((flags & (SDL_INIT_HAPTIC|SDL_INIT_JOYSTICK))) {
  		if (SDL_HelperWindowCreate() < 0) {
  			return -1;
  		}
  	}
  #endif
  
  #if !SDL_TIMERS_DISABLED
      SDL_TicksInit();
  #endif
  
      /* Initialize the event subsystem */
      if ((flags & SDL_INIT_EVENTS)) {
  #if !SDL_EVENTS_DISABLED
          if (SDL_PrivateShouldInitSubsystem(SDL_INIT_EVENTS)) {
              if (SDL_StartEventLoop() < 0) {
                  return (-1);
              }
              SDL_QuitInit();
          }
          SDL_PrivateSubsystemRefCountIncr(SDL_INIT_EVENTS);
  #else
          return SDL_SetError("SDL not built with events support");
  #endif
      }
  
      /* Initialize the timer subsystem */
      if ((flags & SDL_INIT_TIMER)){
  #if !SDL_TIMERS_DISABLED
          if (SDL_PrivateShouldInitSubsystem(SDL_INIT_TIMER)) {
              if (SDL_TimerInit() < 0) {
                  return (-1);
              }
          }
          SDL_PrivateSubsystemRefCountIncr(SDL_INIT_TIMER);
  #else
          return SDL_SetError("SDL not built with timer support");
  #endif
      }
  
      /* Initialize the video subsystem */
      if ((flags & SDL_INIT_VIDEO)){
  #if !SDL_VIDEO_DISABLED
          if (SDL_PrivateShouldInitSubsystem(SDL_INIT_VIDEO)) {
              if (SDL_VideoInit(NULL) < 0) {
                  return (-1);
              }
          }
          SDL_PrivateSubsystemRefCountIncr(SDL_INIT_VIDEO);
  #else
          return SDL_SetError("SDL not built with video support");
  #endif
      }
  
      /* Initialize the audio subsystem */
      if ((flags & SDL_INIT_AUDIO)){
  #if !SDL_AUDIO_DISABLED
          if (SDL_PrivateShouldInitSubsystem(SDL_INIT_AUDIO)) {
              if (SDL_AudioInit(NULL) < 0) {
                  return (-1);
              }
          }
          SDL_PrivateSubsystemRefCountIncr(SDL_INIT_AUDIO);
  #else
          return SDL_SetError("SDL not built with audio support");
  #endif
      }
  
      /* Initialize the joystick subsystem */
      if ((flags & SDL_INIT_JOYSTICK)){
  #if !SDL_JOYSTICK_DISABLED
          if (SDL_PrivateShouldInitSubsystem(SDL_INIT_JOYSTICK)) {
             if (SDL_JoystickInit() < 0) {
                 return (-1);
             }
          }
          SDL_PrivateSubsystemRefCountIncr(SDL_INIT_JOYSTICK);
  #else
          return SDL_SetError("SDL not built with joystick support");
  #endif
      }
  
      if ((flags & SDL_INIT_GAMECONTROLLER)){
  #if !SDL_JOYSTICK_DISABLED
          if (SDL_PrivateShouldInitSubsystem(SDL_INIT_GAMECONTROLLER)) {
              if (SDL_GameControllerInit() < 0) {
                  return (-1);
              }
          }
          SDL_PrivateSubsystemRefCountIncr(SDL_INIT_GAMECONTROLLER);
  #else
          return SDL_SetError("SDL not built with joystick support");
  #endif
      }
  
      /* Initialize the haptic subsystem */
      if ((flags & SDL_INIT_HAPTIC)){
  #if !SDL_HAPTIC_DISABLED
          if (SDL_PrivateShouldInitSubsystem(SDL_INIT_HAPTIC)) {
              if (SDL_HapticInit() < 0) {
                  return (-1);
              }
          }
          SDL_PrivateSubsystemRefCountIncr(SDL_INIT_HAPTIC);
  #else
          return SDL_SetError("SDL not built with haptic (force feedback) support");
  #endif
      }
  
      return (0);
  }
  
  int
  SDL_Init(Uint32 flags)
  {
      return SDL_InitSubSystem(flags);
  }
  
  void
  SDL_QuitSubSystem(Uint32 flags)
  {
      /* Shut down requested initialized subsystems */
  #if !SDL_JOYSTICK_DISABLED
      if ((flags & SDL_INIT_GAMECONTROLLER)) {
          /* game controller implies joystick */
          flags |= SDL_INIT_JOYSTICK;
  
          if (SDL_PrivateShouldQuitSubsystem(SDL_INIT_GAMECONTROLLER)) {
              SDL_GameControllerQuit();
          }
          SDL_PrivateSubsystemRefCountDecr(SDL_INIT_GAMECONTROLLER);
      }
  
      if ((flags & SDL_INIT_JOYSTICK)) {
          /* joystick implies events */
          flags |= SDL_INIT_EVENTS;
  
          if (SDL_PrivateShouldQuitSubsystem(SDL_INIT_JOYSTICK)) {
              SDL_JoystickQuit();
          }
          SDL_PrivateSubsystemRefCountDecr(SDL_INIT_JOYSTICK);
      }
  #endif
  
  #if !SDL_HAPTIC_DISABLED
      if ((flags & SDL_INIT_HAPTIC)) {
          if (SDL_PrivateShouldQuitSubsystem(SDL_INIT_HAPTIC)) {
              SDL_HapticQuit();
          }
          SDL_PrivateSubsystemRefCountDecr(SDL_INIT_HAPTIC);
      }
  #endif
  
  #if !SDL_AUDIO_DISABLED
      if ((flags & SDL_INIT_AUDIO)) {
          if (SDL_PrivateShouldQuitSubsystem(SDL_INIT_AUDIO)) {
              SDL_AudioQuit();
          }
          SDL_PrivateSubsystemRefCountDecr(SDL_INIT_AUDIO);
      }
  #endif
  
  #if !SDL_VIDEO_DISABLED
      if ((flags & SDL_INIT_VIDEO)) {
          /* video implies events */
          flags |= SDL_INIT_EVENTS;
  
          if (SDL_PrivateShouldQuitSubsystem(SDL_INIT_VIDEO)) {
              SDL_VideoQuit();
          }
          SDL_PrivateSubsystemRefCountDecr(SDL_INIT_VIDEO);
      }
  #endif
  
  #if !SDL_TIMERS_DISABLED
      if ((flags & SDL_INIT_TIMER)) {
          if (SDL_PrivateShouldQuitSubsystem(SDL_INIT_TIMER)) {
              SDL_TimerQuit();
          }
          SDL_PrivateSubsystemRefCountDecr(SDL_INIT_TIMER);
      }
  #endif
  
  #if !SDL_EVENTS_DISABLED
      if ((flags & SDL_INIT_EVENTS)) {
          if (SDL_PrivateShouldQuitSubsystem(SDL_INIT_EVENTS)) {
              SDL_QuitQuit();
              SDL_StopEventLoop();
          }
          SDL_PrivateSubsystemRefCountDecr(SDL_INIT_EVENTS);
      }
  #endif
  }
  
  Uint32
  SDL_WasInit(Uint32 flags)
  {
      int i;
      int num_subsystems = SDL_arraysize(SDL_SubsystemRefCount);
      Uint32 initialized = 0;
  
      if (!flags) {
          flags = SDL_INIT_EVERYTHING;
      }
  
      num_subsystems = SDL_min(num_subsystems, SDL_MostSignificantBitIndex32(flags) + 1);
  
      /* Iterate over each bit in flags, and check the matching subsystem. */
      for (i = 0; i < num_subsystems; ++i) {
          if ((flags & 1) && SDL_SubsystemRefCount[i] > 0) {
              initialized |= (1 << i);
          }
  
          flags >>= 1;
      }
  
      return initialized;
  }
  
  void
  SDL_Quit(void)
  {
      SDL_bInMainQuit = SDL_TRUE;
  
      /* Quit all subsystems */
  #if SDL_VIDEO_DRIVER_WINDOWS
      SDL_HelperWindowDestroy();
  #endif
      SDL_QuitSubSystem(SDL_INIT_EVERYTHING);
  
  #if !SDL_TIMERS_DISABLED
      SDL_TicksQuit();
  #endif
  
      SDL_ClearHints();
      SDL_AssertionsQuit();
      SDL_LogResetPriorities();
  
      /* Now that every subsystem has been quit, we reset the subsystem refcount
       * and the list of initialized subsystems.
       */
      SDL_memset( SDL_SubsystemRefCount, 0x0, sizeof(SDL_SubsystemRefCount) );
  
      SDL_bInMainQuit = SDL_FALSE;
  }
  
  /* Get the library version number */
  void
  SDL_GetVersion(SDL_version * ver)
  {
      SDL_VERSION(ver);
  }
  
  /* Get the library source revision */
  const char *
  SDL_GetRevision(void)
  {
      return SDL_REVISION;
  }
  
  /* Get the library source revision number */
  int
  SDL_GetRevisionNumber(void)
  {
      return SDL_REVISION_NUMBER;
  }
  
  /* Get the name of the platform */
  const char *
  SDL_GetPlatform()
  {
  #if __AIX__
      return "AIX";
  #elif __ANDROID__
      return "Android";
  #elif __BSDI__
      return "BSDI";
  #elif __DREAMCAST__
      return "Dreamcast";
  #elif __EMSCRIPTEN__
      return "Emscripten";
  #elif __FREEBSD__
      return "FreeBSD";
  #elif __HAIKU__
      return "Haiku";
  #elif __HPUX__
      return "HP-UX";
  #elif __IRIX__
      return "Irix";
  #elif __LINUX__
      return "Linux";
  #elif __MINT__
      return "Atari MiNT";
  #elif __MACOS__
      return "MacOS Classic";
  #elif __MACOSX__
      return "Mac OS X";
  #elif __NACL__
      return "NaCl";
  #elif __NETBSD__
      return "NetBSD";
  #elif __OPENBSD__
      return "OpenBSD";
  #elif __OS2__
      return "OS/2";
  #elif __OSF__
      return "OSF/1";
  #elif __QNXNTO__
      return "QNX Neutrino";
  #elif __RISCOS__
      return "RISC OS";
  #elif __SOLARIS__
      return "Solaris";
  #elif __WIN32__
      return "Windows";
  #elif __WINRT__
      return "WinRT";
  #elif __TVOS__
      return "tvOS";
  #elif __IPHONEOS__
      return "iOS";
  #elif __PSP__
      return "PlayStation Portable";
  #elif __vita__
      return "PlayStation Vita";
  #elif __ORBIS__
      return "PlayStation 4";
  #else
      return "Unknown (see SDL_platform.h)";
  #endif
  }
  
  #if defined(__WIN32__)
  
  #if (!defined(HAVE_LIBC) || defined(__WATCOMC__)) && !defined(SDL_STATIC_LIB)
  /* Need to include DllMain() on Watcom C for some reason.. */
  
  BOOL APIENTRY
  _DllMainCRTStartup(HANDLE hModule,
                     DWORD ul_reason_for_call, LPVOID lpReserved)
  {
      switch (ul_reason_for_call) {
      case DLL_PROCESS_ATTACH:
      case DLL_THREAD_ATTACH:
      case DLL_THREAD_DETACH:
      case DLL_PROCESS_DETACH:
          break;
      }
      return TRUE;
  }
  #endif /* Building DLL */
  
  #endif /* __WIN32__ */
  
  /* vi: set sts=4 ts=4 sw=4 expandtab: */
  