add Transform.dirty flag

src/objects/Entities.cpp

@@ -18,6 +18,7 @@ void Transform::refresh() {
     combined = glm::translate(combined, pos);
     combined = glm::scale(combined, size);
     combined = combined * glm::mat4(rot);
+    dirty = false;
 }
 
 void Entity::destroy() {
@@ -136,7 +137,7 @@ void Entities::updatePhysics(float delta) {
             eid.uid
         );
         hitbox.linearDamping = hitbox.grounded * 24;
-        transform.pos = hitbox.position;
+        transform.setPos(hitbox.position);
         if (hitbox.grounded && !grounded) {
             scripting::on_entity_grounded(*get(eid.uid), glm::length(prevVel-hitbox.velocity));
         }
@@ -150,7 +151,9 @@ void Entities::update() {
     scripting::on_entities_update();
     auto view = registry.view<Transform>();
     for (auto [entity, transform] : view.each()) {
-        transform.refresh();
+        if (transform.dirty) {
+            transform.refresh();
+        }
     }
 }
 

src/objects/Entities.hpp

@@ -7,6 +7,8 @@
 #include <vector>
 #include <optional>
 #include <glm/glm.hpp>
+#define GLM_ENABLE_EXPERIMENTAL
+#include <glm/gtx/norm.hpp>
 #include <unordered_map>
 #include <entt/entity/registry.hpp>
 
@@ -32,8 +34,21 @@ struct Transform {
     glm::vec3 size;
     glm::mat3 rot;
     glm::mat4 combined;
+    bool dirty = true;
 
     void refresh();
+    
+    inline void setRot(glm::mat3 m) {
+        rot = m;
+        dirty = true;
+    }
+
+    inline void setPos(glm::vec3 v) {
+        if (glm::distance2(pos, v) >= 0.00001f) {
+            dirty = true;
+        }
+        pos = v;
+    }
 };
 
 struct Rigidbody {
@@ -104,7 +119,7 @@ class Entities {
     Level* level;
     std::unordered_map<entityid_t, entt::entity> entities;
     entityid_t nextID = 1;
-    
+
     void preparePhysics();
 public:
     Entities(Level* level);