+Scalar Timer::gNextFire = std::numeric_limits<Scalar>::max();
+std::map<unsigned,Timer*> Timer::gTimers;
+
+
+unsigned Timer::getNewID()
+{
+ static unsigned id = 1;
+ return id++;
+}
+
+
+void Timer::init(const Function& function, Scalar seconds, Mode mode)
+{
+ invalidate();
+
+ mMode = mode;
+
+ if (mMode != INVALID)
+ {
+ mFunction = function;
+
+ if (mode == ACTUAL)
+ {
+ mAbsolute = seconds;
+ }
+ else
+ {
+ mAbsolute = seconds - getTicks();
+ mInterval = seconds;
+ }
+
+ mId = getNewID();
+ gTimers.insert(std::pair<unsigned,Timer*>(mId, this));
+
+ if (mAbsolute < gNextFire) gNextFire = mAbsolute;
+ }
+}
+
+
+bool Timer::isValid() const
+{
+ return mMode != INVALID;
+}
+
+void Timer::invalidate()
+{
+ if (mMode != INVALID)
+ {
+ gTimers.erase(mId);
+ mMode = INVALID;
+
+ if (isEqual(mAbsolute, gNextFire)) gNextFire = findNextFire();
+ }
+}
+
+
+void Timer::fire()
+{
+ Scalar t = getTicks();
+
+ if (mFunction) mFunction(*this, t);
+
+ if (isRepeating())
+ {
+ Scalar absolute = mAbsolute;
+
+ if (isEqual(mAbsolute, t, 1.0)) mAbsolute += mInterval;
+ else mAbsolute = mInterval + t;
+
+ if (isEqual(absolute, gNextFire)) gNextFire = findNextFire();
+ }
+ else
+ {
+ invalidate();
+ }
+}
+
+
+Scalar Timer::findNextFire()
+{
+ std::map<unsigned,Timer*>::iterator it;
+ Scalar nextFire = std::numeric_limits<Scalar>::max();
+
+ for (it = gTimers.begin(); it != gTimers.end(); ++it)
+ {
+ Scalar absolute = (*it).second->mAbsolute;
+ if (absolute < nextFire) nextFire = absolute;
+ }
+
+ return nextFire;
+}
+
+
+Scalar Timer::getSecondsRemaining() const
+{
+ return mAbsolute - getTicks();
+}
+
+bool Timer::isExpired() const
+{
+ return getSecondsRemaining() < 0.0;
+}
+
+bool Timer::isRepeating() const
+{
+ return mMode == REPEAT;
+}
+
+
+void Timer::fireIfExpired()
+{
+ fireIfExpired(getTicks());
+}
+
+void Timer::fireIfExpired(Scalar t)
+{
+ std::map<unsigned,Timer*>::iterator it;
+
+ if (gNextFire > t) return;
+
+ for (it = gTimers.begin(); it != gTimers.end(); ++it)
+ {
+ Timer* timer = (*it).second;
+ if (timer->isExpired()) timer->fire();
+ }
+}
+
+