kc3-lang/SDL/src/timer/windows/SDL_systimer.c

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• Hash : dad42067
  Author :
  Date : 2013-08-12T11:13:50
  

  Fixes #2022, do not resume on Android when surfaceChanged If the app is in landscape mode and the user presses the power button, a pause is followed immediately by a surfaceChanged event because the lock screen is shown in portrait mode. This triggers a "false" resume. So, we just pause and resume following the onWindowFocusChanged events. Also, wait for SDL_APP_WILLENTERBACKGROUND and SDL_APP_DIDENTERBACKGROUND before blocking the event pump.

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• src/timer/windows/SDL_systimer.c

• /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2013 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_config.h"
  
  #ifdef SDL_TIMER_WINDOWS
  
  #include "../../core/windows/SDL_windows.h"
  #include <mmsystem.h>
  
  #include "SDL_timer.h"
  #include "SDL_hints.h"
  
  
  /* The first (low-resolution) ticks value of the application */
  static DWORD start;
  
  #ifndef USE_GETTICKCOUNT
  /* Store if a high-resolution performance counter exists on the system */
  static BOOL hires_timer_available;
  /* The first high-resolution ticks value of the application */
  static LARGE_INTEGER hires_start_ticks;
  /* The number of ticks per second of the high-resolution performance counter */
  static LARGE_INTEGER hires_ticks_per_second;
  #endif
  
  static void
  timeSetPeriod(UINT uPeriod)
  {
      static UINT timer_period = 0;
  
      if (uPeriod != timer_period) {
          if (timer_period) {
              timeEndPeriod(timer_period);
          }
  
          timer_period = uPeriod;
  
          if (timer_period) {
              timeBeginPeriod(timer_period);
          }
      }
  }
  
  static void
  SDL_TimerResolutionChanged(void *userdata, const char *name, const char *oldValue, const char *hint)
  {
      UINT uPeriod;
  
      /* Unless the hint says otherwise, let's have good sleep precision */
      if (hint && *hint) {
          uPeriod = SDL_atoi(hint);
      } else {
          uPeriod = 1;
      }
      if (uPeriod || oldValue != hint) {
          timeSetPeriod(uPeriod);
      }
  }
  
  void
  SDL_StartTicks(void)
  {
      /* Set first ticks value */
  #ifdef USE_GETTICKCOUNT
      start = GetTickCount();
  #else
      /* QueryPerformanceCounter has had problems in the past, but lots of games
         use it, so we'll rely on it here.
       */
      if (QueryPerformanceFrequency(&hires_ticks_per_second) == TRUE) {
          hires_timer_available = TRUE;
          QueryPerformanceCounter(&hires_start_ticks);
      } else {
          hires_timer_available = FALSE;
          timeSetPeriod(1);     /* use 1 ms timer precision */
          start = timeGetTime();
      }
  #endif
  
      SDL_AddHintCallback(SDL_HINT_TIMER_RESOLUTION,
                          SDL_TimerResolutionChanged, NULL);
  }
  
  Uint32
  SDL_GetTicks(void)
  {
      DWORD now;
  #ifndef USE_GETTICKCOUNT
      LARGE_INTEGER hires_now;
  #endif
  
  #ifdef USE_GETTICKCOUNT
      now = GetTickCount();
  #else
      if (hires_timer_available) {
          QueryPerformanceCounter(&hires_now);
  
          hires_now.QuadPart -= hires_start_ticks.QuadPart;
          hires_now.QuadPart *= 1000;
          hires_now.QuadPart /= hires_ticks_per_second.QuadPart;
  
          return (DWORD) hires_now.QuadPart;
      } else {
          now = timeGetTime();
      }
  #endif
  
      return (now - start);
  }
  
  Uint64
  SDL_GetPerformanceCounter(void)
  {
      LARGE_INTEGER counter;
  
      if (!QueryPerformanceCounter(&counter)) {
          return SDL_GetTicks();
      }
      return counter.QuadPart;
  }
  
  Uint64
  SDL_GetPerformanceFrequency(void)
  {
      LARGE_INTEGER frequency;
  
      if (!QueryPerformanceFrequency(&frequency)) {
          return 1000;
      }
      return frequency.QuadPart;
  }
  
  void
  SDL_Delay(Uint32 ms)
  {
      Sleep(ms);
  }
  
  #endif /* SDL_TIMER_WINDOWS */
  
  /* vi: set ts=4 sw=4 expandtab: */
  

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