💿🐜 Antkeeper source code
https://antkeeper.com
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85 lines
2.2 KiB
85 lines
2.2 KiB
/*
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* Copyright (C) 2020 Christopher J. Howard
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*
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* This file is part of Antkeeper source code.
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*
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* Antkeeper source code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Antkeeper source code is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "frame-scheduler.hpp"
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#include <algorithm>
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frame_scheduler::frame_scheduler():
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update_callback(nullptr),
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render_callback(nullptr),
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update_rate(60.0),
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update_timestep(1.0 / update_rate),
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max_frame_duration(update_timestep)
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{
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reset();
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}
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void frame_scheduler::set_update_callback(std::function<void(double, double)> callback)
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{
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update_callback = callback;
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}
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void frame_scheduler::set_render_callback(std::function<void(double)> callback)
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{
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render_callback = callback;
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}
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void frame_scheduler::set_update_rate(double frequency)
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{
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update_rate = frequency;
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update_timestep = 1.0 / frequency;
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}
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void frame_scheduler::set_max_frame_duration(double duration)
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{
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max_frame_duration = duration;
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}
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double frame_scheduler::get_frame_duration() const
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{
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return frame_duration;
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}
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void frame_scheduler::reset()
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{
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elapsed_time = 0.0;
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accumulator = 0.0;
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frame_start = std::chrono::high_resolution_clock::now();
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frame_end = frame_start;
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frame_duration = 0.0;
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}
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void frame_scheduler::tick()
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{
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accumulator += std::min<double>(max_frame_duration, frame_duration);
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while (accumulator >= update_timestep)
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{
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update_callback(elapsed_time, update_timestep);
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elapsed_time += update_timestep;
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accumulator -= update_timestep;
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}
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render_callback(accumulator * update_rate);
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frame_end = std::chrono::high_resolution_clock::now();
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frame_duration = static_cast<double>(std::chrono::duration_cast<std::chrono::microseconds>(frame_end - frame_start).count()) / 1000000.0;
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frame_start = frame_end;
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}
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