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

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• Hash : 99c9727d
  Author :
  Date : 2021-10-23T15:00:31
  

  timer: Added SDL_GetTicks64(), for a timer that doesn't wrap every ~49 days.
  
  Note that this removes the timeGetTime() fallback on Windows; it is a
  32-bit counter and SDL2 should never choose to use it, as it only is needed
  if QueryPerformanceCounter() isn't available, and QPC is _always_ available
  on Windows XP and later.
  
  OS/2 has a similar situation, but since it isn't clear to me that similar
  promises can be made about DosTmrQueryTime() even in modern times, I decided
  to leave the fallback in, with some heroic measures added to try to provide a
  true 64-bit tick counter despite the 49-day wraparound. That approach can
  migrate to Windows too, if we discover some truly broken install that doesn't
  have QPC and still depends on timeGetTime().
  
  Fixes #4870.
  

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• src/timer/haiku/SDL_systimer.c

• /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2021 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"
  
  #ifdef SDL_TIMER_HAIKU
  
  #include <kernel/OS.h>
  
  #include "SDL_timer.h"
  
  static bigtime_t start;
  static SDL_bool ticks_started = SDL_FALSE;
  
  void
  SDL_TicksInit(void)
  {
      if (ticks_started) {
          return;
      }
      ticks_started = SDL_TRUE;
  
      /* Set first ticks value */
      start = system_time();
  }
  
  void
  SDL_TicksQuit(void)
  {
      ticks_started = SDL_FALSE;
  }
  
  Uint64
  SDL_GetTicks64(void)
  {
      if (!ticks_started) {
          SDL_TicksInit();
      }
  
      return (Uint64) ((system_time() - start) / 1000);
  }
  
  Uint64
  SDL_GetPerformanceCounter(void)
  {
      return system_time();
  }
  
  Uint64
  SDL_GetPerformanceFrequency(void)
  {
      return 1000000;
  }
  
  void
  SDL_Delay(Uint32 ms)
  {
      snooze(ms * 1000);
  }
  
  #endif /* SDL_TIMER_HAIKU */
  
  /* vi: set ts=4 sw=4 expandtab: */
  

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