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/**
* @file engine.cpp
* Manages all game systems.
*
* Copyright (C) 2019 Clyne Sullivan
* Copyright (C) 2019 Belle-Isle, Andrew <drumsetmonkey@gmail.com>
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "engine.hpp"
#include "gamerun.hpp"
#include "input.hpp"
#include "player.hpp"
#include "script.hpp"
#include "render.hpp"
#include "components/Script.hpp"
#include "components/Position.hpp"
#include "components/Velocity.hpp"
int Engine::init(void)
{
systems.add<GameRunSystem>();
systems.add<InputSystem>();
systems.add<PlayerSystem>();
systems.add<RenderSystem>();
systems.add<ScriptSystem>();
systems.configure();
systems.system<ScriptSystem>()->init();
return 0;
}
void Engine::logicLoop(void)
{
using namespace std::chrono_literals;
namespace cr = std::chrono;
typedef std::chrono::high_resolution_clock mc;
entityx::TimeDelta dt = 0; /**< Elapsed milliseconds since each loop */
double elapsed = 0;
while (shouldRun()) {
auto start = mc::now();
/***********************
* UPDATE FREQUENTLY *
***********************/
entities.each<Position, Velocity>
([&](entityx::Entity, Position &p, Velocity &v){
p.x += (v.x * dt/1000.0);
p.y += (v.y * dt/1000.0);
});
systems.update<InputSystem>(dt);
/*******************
* LOGIC UPDATES *
*******************/
// Update 20 times a second
if (elapsed > 50) {
elapsed = 0;
// All entities with an idle function should be run here
entities.each<Scripted>([](entityx::Entity, Scripted &f){
f.exec();
});
}
auto end = mc::now();
auto diff = end - start;
auto micros = cr::duration_cast<cr::microseconds>(diff);
auto msc = micros.count();
dt = static_cast<double>(msc)/1000.0;
elapsed += dt;
std::this_thread::yield();
}
// Remove all Lua references from entities
entities.each<Scripted>([](entityx::Entity, Scripted &f){ f.cleanup(); });
}
void Engine::renderLoop(void)
{
while (shouldRun()) {
systems.update<RenderSystem>(0);
std::this_thread::yield();
}
}
void Engine::run(void)
{
// Start logic thread
logicThread = std::thread([this](void) {
logicLoop();
});
// Keep render loop on main thread
renderLoop();
// Done, bring logic thread back
logicThread.join();
}
bool Engine::shouldRun(void)
{
auto grs = systems.system<GameRunSystem>();
return grs ? grs->shouldRun() : true;
}
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