feat(physics): physics entity now supports overlap

core/src/physics_entity.c

@@ -81,9 +81,14 @@ void physics_entity_update(PhysicsEntity self) {
 
     List* contacts = rigidbody_get_contacts(body);
     if(contacts->len > 0) {
-        self.tc->collision_solver(self.data, contacts);
-        list_foreach(Contact*, contact, contacts)
-            self.tc->on_collision(self.data, contact->hit);
+        if(rigidbody_get_overlap(body)) {
+            list_foreach(Contact*, contact, contacts)
+                self.tc->on_overlap(self.data, contact->hit.other);
+        } else {
+            self.tc->collision_solver(self.data, contacts);
+            list_foreach(Contact*, contact, contacts)
+                self.tc->on_collision(self.data, contact->hit);
+        }
     }
     rigidbody_collect_contacts(body);
 

core/src/physics_entity.h

@@ -8,15 +8,17 @@
 
 typedef struct Collision Collision;
 typedef struct RigidBody RigidBody;
+typedef struct PhysicsEntity PhysicsEntity;
 
-typedef struct {
+typedef struct IPhysicsEntity {
     RigidBody* (*const get_rigidbody)(void* self);
     Shape* (*const get_shape)(void* self);
     void(*const on_collision)(void* self, Collision collision);
+    void(*const on_overlap)(void* self, PhysicsEntity other);
     void(*const collision_solver)(void* self, List* collisions);
 } IPhysicsEntity;
 
-typedef struct {
+typedef struct PhysicsEntity {
     void* data;
     IPhysicsEntity const* tc;
     ITransformable const* transformable;
@@ -27,18 +29,20 @@ extern void physics_entity_solve_contacts(PhysicsEntity self, List* contacts);
 extern void physics_entity_update(PhysicsEntity self);
 
 
-#define impl_PhysicsEntity_for(T, get_rigidbody_f, get_shape_f, on_collision_f, collision_solver_f)\
+#define impl_PhysicsEntity_for(T, get_rigidbody_f, get_shape_f, on_collision_f, on_overlap_f, collision_solver_f)\
 static inline PhysicsEntity T##_as_PhysicsEntity(T* x) {\
     TC_FN_TYPECHECK(Transformable, T##_as_Transformable, T*);\
     TC_FN_TYPECHECK(RigidBody*, get_rigidbody_f, T*);\
     TC_FN_TYPECHECK(Shape*, get_shape_f, T*);\
     TC_FN_TYPECHECK(void, on_collision_f, T*, Collision);\
+    TC_FN_TYPECHECK(void, on_overlap_f, T*, PhysicsEntity);\
     TC_FN_TYPECHECK(void, collision_solver_f, T*, List*);\
     static IPhysicsEntity const tc = {\
-        .get_rigidbody =     (RigidBody*(*const)(void*))     get_rigidbody_f,\
-        .get_shape =         (Shape*(*const)(void*))         get_shape_f,\
-        .on_collision =      (void(*const)(void*,Collision)) on_collision_f,\
-        .collision_solver =  (void(*const)(void*,List*))     collision_solver_f,\
+        .get_rigidbody =     (RigidBody*(*const)(void*))            get_rigidbody_f,\
+        .get_shape =         (Shape*(*const)(void*))                get_shape_f,\
+        .on_collision =      (void(*const)(void*,Collision))        on_collision_f,\
+        .on_overlap =        (void(*const)(void*,PhysicsEntity))    on_overlap_f\
+        .collision_solver =  (void(*const)(void*,List*))            collision_solver_f,\
     };\
     Transformable transformable = T##_as_Transformable(x);\
     return (PhysicsEntity){.data = x, .tc = &tc, .transformable = transformable.tc};\

core/src/rigidbody.c

@@ -9,7 +9,6 @@ struct RigidBody {
     Transformable transformable;
 
     float mass;
-
     float bounce;
 
     Vector last_linear_force;
@@ -17,7 +16,10 @@ struct RigidBody {
     Vector linear_velocity;
     Transform internal_transform;
 
-    int is_static;
+    PhysicsMask layers;
+    PhysicsMask collision_mask;
+    
+    int overlap;
 
     List contacts;
 };
@@ -36,7 +38,11 @@ RigidBody* rigidbody_make(Transformable transform) {
 
         .internal_transform = *transform.tc->get_transform(transform.data),
 
-        .is_static = 0,
+        .layers = 0x1,
+        .collision_mask = 0x1,
+        
+        .overlap = 0,
+        
         .contacts = list_from_type(Contact),
     };
     return self;
@@ -129,12 +135,28 @@ void rigidbody_accelerate(RigidBody* self, Vector force, int use_mass) {
         self->next_linear_force = vaddf(self->next_linear_force, force);
 }
 
-int rigidbody_is_static(const RigidBody* self) {
-    return self->is_static;
+PhysicsMask rigidbody_get_layers(RigidBody* self) {
+    return self->layers;
 }
 
-void rigidbody_set_static(RigidBody* self, int is_static) {
-    self->is_static = is_static;
+void rigidbody_set_layers(RigidBody* self, PhysicsMask layers) {
+    self->layers = layers;
+}
+
+PhysicsMask rigidbody_get_collision_mask(RigidBody* self) {
+    return self->collision_mask;
+}
+
+void rigidbody_set_collision_mask(RigidBody* self, PhysicsMask mask) {
+    self->collision_mask = mask;
+}
+
+int rigidbody_get_overlap(RigidBody* self) {
+    return self->overlap;
+}
+
+void rigidbody_set_overlap(RigidBody* self, int value) {
+    self->overlap = 1;
 }
 
 Vector rigidbody_get_velocity(const RigidBody* self) {

core/src/rigidbody.h

@@ -5,13 +5,19 @@
 #include "transformable.h"
 #include "list.h"
 #include "collision.h"
+#include "stdint.h"
+
+typedef uint32_t PhysicsMask;
 
 struct Collision;
 typedef struct {
     struct Collision hit;
     float duration;
 } Contact;
+
 typedef struct RigidBody RigidBody;
+typedef struct PhysicsEntity PhysicsEntity;
+
 typedef void (*CollisionHandlerFn)(void* obj, List* collisions);
 
 // Referenced transform is stored but not owned by the rigidbody.
@@ -33,8 +39,14 @@ extern void rigidbody_set_bounce(RigidBody* self, float bounce);
 extern void rigidbody_add_impulse(RigidBody* self, Vector force, int use_mass);
 extern void rigidbody_accelerate(RigidBody* self, Vector force, int use_mass);
 
-extern int rigidbody_is_static(const RigidBody* self);
-extern void rigidbody_set_static(RigidBody* self, int is_static);
+extern PhysicsMask rigidbody_get_layers(RigidBody* self);
+extern void rigidbody_set_layers(RigidBody* self, PhysicsMask layers);
+
+extern PhysicsMask rigidbody_get_collision_mask(RigidBody* self);
+extern void rigidbody_set_collision_mask(RigidBody* self, PhysicsMask mask);
+
+extern int rigidbody_get_overlap(RigidBody* self);
+extern void rigidbody_set_overlap(RigidBody* self, int value);
 
 extern Vector rigidbody_get_velocity(const RigidBody* self);
 extern void rigidbody_set_velocity(RigidBody* self, Vector velocity);