adecentat el codi. lo proxim fa falta mirar i pollar events

source/core/timer/timer.hpp

@@ -0,0 +1,25 @@
+// timer.hpp
+
+#pragma once
+
+#include <SDL3/SDL.h>
+
+#include <algorithm>
+
+class Timer {
+   public:
+    void start() {
+        last_ticks_ms_ = SDL_GetTicks();
+    }
+
+    auto getDelta() -> int {
+        const Uint64 NOW_MS = SDL_GetTicks();
+        int delta_ms = static_cast<int>(NOW_MS - last_ticks_ms_);
+        delta_ms = std::max(delta_ms, 0);
+        last_ticks_ms_ = NOW_MS;
+        return delta_ms;
+    }
+
+   private:
+    Uint64 last_ticks_ms_{0};
+};