add entity events: on_spawn, on_despawn

src/physics/Hitbox.cpp

@@ -4,5 +4,5 @@ Hitbox::Hitbox(glm::vec3 position, glm::vec3 halfsize)
   : position(position), 
     halfsize(halfsize), 
     velocity(0.0f,0.0f,0.0f), 
-    linear_damping(0.1f) 
+    linearDamping(0.1f) 
 {}

src/physics/Hitbox.hpp

@@ -3,12 +3,11 @@
 
 #include <glm/glm.hpp>
 
-class Hitbox {
-public:
+struct Hitbox {
     glm::vec3 position;
     glm::vec3 halfsize;
     glm::vec3 velocity;
-    float linear_damping;
+    float linearDamping;
     bool grounded = false;
 
     Hitbox(glm::vec3 position, glm::vec3 halfsize);

src/physics/PhysicsSolver.cpp

@@ -22,7 +22,7 @@ void PhysicsSolver::step(
     bool collisions
 ) {
     float dt = delta / static_cast<float>(substeps);
-    float linear_damping = hitbox->linear_damping;
+    float linearDamping = hitbox->linearDamping;
     float s = 2.0f/BLOCK_AABB_GRID;
 
     const glm::vec3& half = hitbox->halfsize;
@@ -41,8 +41,8 @@ void PhysicsSolver::step(
             colisionCalc(chunks, hitbox, vel, pos, half, 
                          (prevGrounded && gravityScale > 0.0f) ? 0.5f : 0.0f);
         }
-        vel.x *= glm::max(0.0f, 1.0f - dt * linear_damping);
-        vel.z *= glm::max(0.0f, 1.0f - dt * linear_damping);
+        vel.x *= glm::max(0.0f, 1.0f - dt * linearDamping);
+        vel.z *= glm::max(0.0f, 1.0f - dt * linearDamping);
 
         pos += vel * dt + gravity * gravityScale * dt * dt * 0.5f;
         if (hitbox->grounded && pos.y < py) {

src/physics/PhysicsSolver.hpp

@@ -7,8 +7,8 @@
 #include <glm/glm.hpp>
 
 class Block;
-class Hitbox;
 class Chunks;
+struct Hitbox;
 
 class PhysicsSolver {
     glm::vec3 gravity;