1 files changed, 58 insertions, 0 deletions
diff --git a/src/crepe/api/LoopTimer.cpp b/src/crepe/api/LoopTimer.cpp
new file mode 100644
index 0000000..98ce08d
--- /dev/null
+++ b/src/crepe/api/LoopTimer.cpp
@@ -0,0 +1,58 @@
+
+#include "../facade/SDLContext.h"
+
+#include "LoopTimer.h"
+
+using namespace crepe;
+LoopTimer::LoopTimer() {}
+
+LoopTimer & LoopTimer::get_instance() {
+    static LoopTimer instance;
+    return instance;
+}
+
+void LoopTimer::start() {
+    last_frame_time = SDLContext::get_instance().get_ticks();
+    elapsed_time = 0;
+    elapsed_fixed_time = 0;
+    delta_time = 0;
+}
+
+void LoopTimer::update() {
+    uint64_t current_frame_time = SDLContext::get_instance().get_ticks();
+    delta_time = (current_frame_time - last_frame_time) / 1000.0;
+
+    if (delta_time > maximum_delta_time) {
+        delta_time = maximum_delta_time;
+    }
+    delta_time = game_scale;
+    elapsed_time += delta_time;
+    last_frame_time = current_frame_time;
+}
+
+double LoopTimer::get_delta_time() const { return delta_time; }
+int LoopTimer::get_current_time() const { return elapsed_time; }
+
+void LoopTimer::advance_fixed_update() { elapsed_fixed_time += fixed_delta_time; }
+
+double LoopTimer::get_fixed_delta_time() const { return fixed_delta_time; }
+
+void LoopTimer::set_fps(int fps) {
+    this->fps = fps;
+    frame_target_time = 1.0 / fps;
+}
+
+int LoopTimer::get_fps() const { return fps; }
+void LoopTimer::set_game_scale(double value) { game_scale = value; };
+double LoopTimer::get_game_scale() const { return game_scale; }
+void LoopTimer::enforce_frame_rate() {
+    uint64_t current_frame_time = SDLContext::get_instance().get_ticks();
+    double frame_duration = (current_frame_time - last_frame_time) / 1000.0;
+
+    if (frame_duration < frame_target_time) {
+        uint32_t delay_time
+            = (uint32_t) ((frame_target_time - frame_duration) / 1000.0);
+        SDLContext::get_instance().delay(delay_time);
+    }
+}
+double LoopTimer::get_lag() const { return elapsed_time - elapsed_fixed_time; }