add 'on_physics_update' entity event

src/logic/scripting/scripting.hpp

@@ -130,6 +130,7 @@ namespace scripting {
     void on_entity_fall(const Entity& entity);
     void on_entity_save(const Entity& entity);
     void on_entities_update(int tps, int parts, int part);
+    void on_entities_physics_update(int tps, int parts, int part);
     void on_entities_render(float delta);
     void on_sensor_enter(const Entity& entity, size_t index, entityid_t oid);
     void on_sensor_exit(const Entity& entity, size_t index, entityid_t oid);

src/logic/scripting/scripting_entities.cpp

@@ -279,6 +279,16 @@ void scripting::on_entities_update(int tps, int parts, int part) {
     lua::pop(L);
 }
 
+void scripting::on_entities_physics_update(int tps, int parts, int part) {
+    auto L = lua::get_main_state();
+    lua::get_from(L, STDCOMP, "physics_update", true);
+    lua::pushinteger(L, tps);
+    lua::pushinteger(L, parts);
+    lua::pushinteger(L, part);
+    lua::call_nothrow(L, 3, 0);
+    lua::pop(L);
+}
+
 void scripting::on_entities_render(float delta) {
     auto L = lua::get_main_state();
     lua::get_from(L, STDCOMP, "render", true);

src/objects/Entities.cpp

@@ -25,7 +25,10 @@
 static debug::Logger logger("entities");
 
 Entities::Entities(Level& level)
-    : level(level), sensorsTickClock(20, 3), updateTickClock(20, 3) {
+    : level(level),
+      sensorsTickClock(20, 3),
+      updateTickClock(20, 3),
+      physicsTickClock(60, 1) {
 }
 
 std::optional<Entity> Entities::get(entityid_t id) {
@@ -320,6 +323,13 @@ void Entities::update(float delta) {
             updateTickClock.getPart()
         );
     }
+    if (physicsTickClock.update(delta)) {
+        scripting::on_entities_physics_update(
+            physicsTickClock.getTickRate(),
+            physicsTickClock.getParts(),
+            physicsTickClock.getPart()
+        );
+    }
 }
 
 static void debug_render_skeleton(

src/objects/Entities.hpp

@@ -39,6 +39,7 @@ class Entities {
     entityid_t nextID = 1;
     util::Clock sensorsTickClock;
     util::Clock updateTickClock;
+    util::Clock physicsTickClock;
 
     void updateSensors(
         Rigidbody& body, const Transform& tsf, std::vector<Sensor*>& sensors