1 files changed, 75 insertions, 0 deletions
diff --git a/src/engine.cpp b/src/engine.cpp
new file mode 100644
index 0000000..0bc647b
--- /dev/null
+++ b/src/engine.cpp
@@ -0,0 +1,75 @@
+/**
+ * @file engine.cpp
+ * Manages all game systems.
+ *
+ * Copyright (C) 2019 Clyne Sullivan
+ *
+ * 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 "window.hpp"
+
+int Engine::init(void)
+{
+	systems.add<GameRunSystem>();
+	systems.add<InputSystem>();
+	systems.add<WindowSystem>();
+
+	systems.configure();
+	return 0;
+}
+
+void Engine::logicLoop(void)
+{
+	using namespace std::chrono_literals;
+
+	entityx::TimeDelta dt = 0;
+
+	while (shouldRun()) {
+		systems.update<InputSystem>(dt);
+		std::this_thread::sleep_for(100ms);
+	}
+}
+
+void Engine::renderLoop(void)
+{
+	while (shouldRun()) {
+		systems.update<WindowSystem>(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;
+}
+