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/*
* This file is part of NumptyPhysics <http://thp.io/2015/numptyphysics/>
* Coyright (c) 2014 Thomas Perl <m@thp.io>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*/
#include "thp_timestep.h"
thp::Timestep::Timestep(float fps)
: fps(fps)
, tick_last(0)
, tick_accumulator(0)
, paused_start(-1)
, running_time(0)
{
}
void
thp::Timestep::update(long now, std::function<void()> callback)
{
tick_accumulator += (now - tick_last);
tick_last = now;
long ticks = 1000 / fps;
while (tick_accumulator > ticks) {
callback();
tick_accumulator -= ticks;
running_time += ticks;
}
}
void
thp::Timestep::paused()
{
}
void
thp::Timestep::resumed(long now)
{
// Empty the accumulator, so we don't fast-forward
tick_accumulator = 0;
tick_last = now;
}
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