IPlugTimer.cpp

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/*
 ==============================================================================
 
 This file is part of the iPlug 2 library. Copyright (C) the iPlug 2 developers. 
 
 See LICENSE.txt for  more info.
 
 ==============================================================================
*/

#include "IPlugTimer.h"

using namespace iplug;

#if defined OS_MAC || defined OS_IOS

Timer* Timer::Create(ITimerFunction func, uint32_t intervalMs)
{
  return new Timer_impl(func, intervalMs);
}

Timer_impl::Timer_impl(ITimerFunction func, uint32_t intervalMs)
: mTimerFunc(func)
, mIntervalMs(intervalMs)
{
  CFRunLoopTimerContext context;
  context.version = 0;
  context.info = this;
  context.retain = nullptr;
  context.release = nullptr;
  context.copyDescription = nullptr;
  CFTimeInterval interval = intervalMs / 1000.0;
  CFRunLoopRef runLoop = CFRunLoopGetMain();
  mOSTimer = CFRunLoopTimerCreate(kCFAllocatorDefault, CFAbsoluteTimeGetCurrent(), interval, 0, 0, TimerProc, &context);
  CFRunLoopAddTimer(runLoop, mOSTimer, kCFRunLoopCommonModes);
}

Timer_impl::~Timer_impl()
{
  Stop();
}

void Timer_impl::Stop()
{
  if (mOSTimer)
  {
    CFRunLoopTimerInvalidate(mOSTimer);
    CFRelease(mOSTimer);
    mOSTimer = nullptr;
  }
}

void Timer_impl::TimerProc(CFRunLoopTimerRef timer, void *info)
{
  Timer_impl* itimer = (Timer_impl*) info;
  itimer->mTimerFunc(*itimer);
}

#elif defined OS_WIN

Timer* Timer::Create(ITimerFunction func, uint32_t intervalMs)
{
  return new Timer_impl(func, intervalMs);
}

WDL_Mutex Timer_impl::sMutex;
WDL_PtrList<Timer_impl> Timer_impl::sTimers;

Timer_impl::Timer_impl(ITimerFunction func, uint32_t intervalMs)
: mTimerFunc(func)
, mIntervalMs(intervalMs)

{
  ID = SetTimer(0, 0, intervalMs, TimerProc); //TODO: timer ID correct?
  
  if (ID)
  {
    WDL_MutexLock lock(&sMutex);
    sTimers.Add(this);
  }
}

Timer_impl::~Timer_impl()
{
  Stop();
}

void Timer_impl::Stop()
{
  if (ID)
  {
    KillTimer(0, ID);
    WDL_MutexLock lock(&sMutex);
    sTimers.DeletePtr(this);
    ID = 0;
  }
}

void CALLBACK Timer_impl::TimerProc(HWND hwnd, UINT uMsg, UINT_PTR idEvent, DWORD dwTime)
{
  WDL_MutexLock lock(&sMutex);

  for (auto i = 0; i < sTimers.GetSize(); i++)
  {
    Timer_impl* pTimer = sTimers.Get(i);
    
    if (pTimer->ID == idEvent)
    {
      pTimer->mTimerFunc(*pTimer);
      return;
    }
  }
}
#elif defined OS_WEB
Timer* Timer::Create(ITimerFunction func, uint32_t intervalMs)
{
  return new Timer_impl(func, intervalMs);
}

Timer_impl::Timer_impl(ITimerFunction func, uint32_t intervalMs)
: mTimerFunc(func)
{
  ID = emscripten_set_interval(TimerProc, intervalMs, this);
}

Timer_impl::~Timer_impl()
{
  Stop();
}

void Timer_impl::Stop()
{
  emscripten_clear_interval(ID);
}

void Timer_impl::TimerProc(void* userData)
{
  Timer_impl* itimer = (Timer_impl*) userData;
  itimer->mTimerFunc(*itimer);
}
#endif