1 files changed, 67 insertions, 0 deletions
diff --git a/src/crepe/api/Engine.cpp b/src/crepe/api/Engine.cpp
new file mode 100644
index 0000000..cd9786b
--- /dev/null
+++ b/src/crepe/api/Engine.cpp
@@ -0,0 +1,67 @@
+#include "../util/Log.h"
+
+#include "Engine.h"
+
+using namespace crepe;
+using namespace std;
+
+int Engine::main() noexcept {
+	try {
+		this->setup();
+	} catch (const exception & e) {
+		Log::logf(Log::Level::ERROR, "Uncaught exception in setup: {}\n", e.what());
+		return EXIT_FAILURE;
+	}
+
+	try {
+		this->loop();
+	} catch (const exception & e) {
+		Log::logf(Log::Level::ERROR, "Uncaught exception in main loop: {}\n", e.what());
+		this->event_manager.trigger_event<ShutDownEvent>();
+	}
+
+	return EXIT_SUCCESS;
+}
+
+void Engine::setup() {
+	this->loop_timer.start();
+	this->scene_manager.load_next_scene();
+
+	this->event_manager.subscribe<ShutDownEvent>([this](const ShutDownEvent & event) {
+		this->game_running = false;
+
+		// propagate to possible user ShutDownEvent listeners
+		return false;
+	});
+}
+
+void Engine::loop() {
+	LoopTimerManager & timer = this->loop_timer;
+	SystemManager & systems = this->system_manager;
+
+	while (this->game_running) {
+		timer.update();
+
+		while (timer.get_lag() >= timer.get_fixed_delta_time()) {
+			try {
+				systems.fixed_update();
+			} catch (const exception & e) {
+				Log::logf(
+					Log::Level::WARNING, "Uncaught exception in fixed update function: {}\n",
+					e.what()
+				);
+			}
+			timer.advance_fixed_elapsed_time();
+		}
+
+		try {
+			systems.frame_update();
+		} catch (const exception & e) {
+			Log::logf(
+				Log::Level::WARNING, "Uncaught exception in frame update function: {}\n",
+				e.what()
+			);
+		}
+		timer.enforce_frame_rate();
+	}
+}