feat: add Pocket Dungeon game prototype

Libraries/GameKit/Source/GameKitLoop.cpp

@@ -0,0 +1,38 @@
+#include "GameKitLoop.h"
+
+namespace GameKit {
+
+Loop::~Loop() { stop(); }
+
+bool Loop::start(uint32_t tickMs, Scene* targetScene) {
+    stop();
+    if (targetScene == nullptr || tickMs == 0) return false;
+    scene = targetScene;
+    periodMs = tickMs;
+    lastTickMs = lv_tick_get();
+    timer = lv_timer_create(onTimer, tickMs, this);
+    return timer != nullptr;
+}
+
+void Loop::stop() {
+    if (timer != nullptr) {
+        lv_timer_delete(timer);
+        timer = nullptr;
+    }
+    scene = nullptr;
+    periodMs = 0;
+    lastTickMs = 0;
+}
+
+void Loop::onTimer(lv_timer_t* timer) {
+    auto* loop = static_cast<Loop*>(lv_timer_get_user_data(timer));
+    if (loop == nullptr || loop->scene == nullptr) return;
+    const uint32_t now = lv_tick_get();
+    uint32_t dt = loop->periodMs;
+    if (loop->lastTickMs != 0) dt = now - loop->lastTickMs;
+    loop->lastTickMs = now;
+    loop->scene->onTick(Tick { dt, now });
+    loop->scene->render();
+}
+
+} // namespace GameKit