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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 "audio.hpp"
#include "config.hpp"
#include "engine.hpp"
#include "gamestate.hpp"
#include "gamerun.hpp"
#include "input.hpp"
#include "player.hpp"
#include "script.hpp"
#include "render.hpp"
#include "physics.hpp"
#include "text.hpp"
#include "components/EventListener.hpp"
#include "components/Script.hpp"
#include "components/Position.hpp"
#include "components/Velocity.hpp"
#include <fstream>
using namespace std::literals::string_literals;
using namespace std::chrono_literals;
namespace cr = std::chrono;
typedef std::chrono::high_resolution_clock mc;
int Engine::init(void)
{
Config::load();
systems.add<GameRunSystem>();
systems.add<InputSystem>();
systems.add<PlayerSystem>(entities);
systems.add<WorldSystem>();
systems.add<RenderSystem>();
systems.add<ScriptSystem>(entities, *(systems.system<WorldSystem>().get()));
systems.add<PhysicsSystem>();
systems.add<TextSystem>();
systems.add<AudioSystem>();
systems.configure();
// Load game script and entity data
auto* script = systems.system<ScriptSystem>().get();
script->addToGameNamespace("loadFont",
bindInstance(&TextSystem::loadFont,
systems.system<TextSystem>().get()));
script->addToGameNamespace("puts",
bindInstance(&TextSystem::put,
systems.system<TextSystem>().get()));
script->addToGameNamespace("play",
bindInstance(&AudioSystem::playSound,
systems.system<AudioSystem>().get()));
script->init();
if (GameState::load("save.json", entities)) {
std::cout << "Loaded from save.json. Delete the file if you don't want "
"it." << std::endl;
}
// Initially update the world to send all systems world data
systems.update<WorldSystem>(0);
return 0;
}
void Engine::logicLoop(void)
{
entityx::TimeDelta dt = 0; /**< Elapsed milliseconds since each loop */
double elapsed = 1000; /**< Time elapsed since last logic loop. This
should be initialized to something larger
than our logic loop period (50ms), so
the logic loop is run during our first
loop. */
auto start = mc::now();
while (shouldRun()) {
auto end = start;
start = mc::now();
auto diff = start-end;
auto micros = cr::duration_cast<cr::microseconds>(diff);
auto msc = micros.count();
dt = static_cast<double>(msc) / 1000.0;
elapsed += dt;
systems.update<InputSystem>(dt);
//systems.update<ScriptSystem>(dt);
/*******************
* LOGIC UPDATES *
*******************/
// Update 20 times a second
if (elapsed > 50) {
elapsed = 0;
systems.update<WorldSystem>(dt);
// All entities with an idle function should be run here
entities.each<Scripted>([](entityx::Entity, Scripted &f){
f.exec();
});
}
systems.update<AudioSystem>(dt);
std::this_thread::yield();
}
}
void Engine::physicsLoop(void)
{
entityx::TimeDelta dt = 0; /**< Elapsed milliseconds since each loop */
auto start = mc::now();
while (shouldRun()) {
auto end = start;
start = mc::now();
auto diff = start - end;
auto micros = cr::duration_cast<cr::microseconds>(diff);
auto msc = micros.count();
dt = static_cast<double>(msc) / 1000.0;
// Update the entities physics/position
systems.update<PhysicsSystem>(dt);
std::this_thread::yield();
}
}
void Engine::renderLoop(int& fpsCounter)
{
entityx::TimeDelta dt = 0; /**< Elapsed milliseconds since each loop */
while (shouldRun()) {
systems.update<TextSystem>(dt);
systems.update<RenderSystem>(dt);
fpsCounter++;
}
}
void Engine::run(void)
{
int fpsCounter = 0;
// Start logic thread
logicThread = std::thread([this](void) {
logicLoop();
});
physicsThread = std::thread([this](void) {
physicsLoop();
});
debugThread = std::thread([this, &fpsCounter](void) {
while (shouldRun()) {
std::this_thread::sleep_for(1s);
fps = fpsCounter;
fpsCounter = 0;
systems.system<TextSystem>()->put("default", 0, 0, "fps: "s + std::to_string(fps));
}
});
// Keep render loop on main thread
renderLoop(fpsCounter);
// Done, bring logic thread back
logicThread.join();
physicsThread.join();
debugThread.join();
// Save the entities' data, and settings data
GameState::save("save.json", entities);
Config::save();
// Remove all Lua references from entities
entities.each<Scripted>([](entityx::Entity, Scripted &f) {
f.cleanup(); });
entities.each<EventListener>([](entityx::Entity, EventListener &f) {
f.cleanup(); });
systems.system<WorldSystem>()->cleanup();
}
bool Engine::shouldRun(void)
{
auto grs = systems.system<GameRunSystem>();
return grs ? grs->shouldRun() : true;
}
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