Body:getMass; Body:setMass;

src/api/types/body.c

@@ -287,6 +287,19 @@ int l_lovrBodyGetWorld(lua_State* L) {
   return 1;
 }
 
+int l_lovrBodyGetMass(lua_State* L) {
+  Body* body = luax_checktype(L, 1, Body);
+  lua_pushnumber(L, lovrBodyGetMass(body));
+  return 1;
+}
+
+int l_lovrBodySetMass(lua_State* L) {
+  Body* body = luax_checktype(L, 1, Body);
+  float mass = luaL_checknumber(L, 2);
+  lovrBodySetMass(body, mass);
+  return 0;
+}
+
 const luaL_Reg lovrBody[] = {
   { "getPosition", l_lovrBodyGetPosition },
   { "setPosition", l_lovrBodySetPosition },
@@ -317,5 +330,7 @@ const luaL_Reg lovrBody[] = {
   { "getUserData", l_lovrBodyGetUserData },
   { "setUserData", l_lovrBodySetUserData },
   { "getWorld", l_lovrBodyGetWorld },
+  { "getMass", l_lovrBodyGetMass },
+  { "setMass", l_lovrBodySetMass },
   { NULL, NULL }
 };

src/physics/physics.c

@@ -264,6 +264,19 @@ World* lovrBodyGetWorld(Body* body) {
   return body->world;
 }
 
+float lovrBodyGetMass(Body* body) {
+  dMass m;
+  dBodyGetMass(body->id, &m);
+  return m.mass;
+}
+
+void lovrBodySetMass(Body* body, float mass) {
+  dMass m;
+  dBodyGetMass(body->id, &m);
+  dMassAdjust(&m, mass);
+  dBodySetMass(body->id, &m);
+}
+
 void lovrShapeDestroy(const Ref* ref) {
   Shape* shape = containerof(ref, Shape);
   dGeomDestroy(shape->id);

src/physics/physics.h

@@ -79,6 +79,8 @@ void lovrBodySetAwake(Body* body, int awake);
 void* lovrBodyGetUserData(Body* body);
 void lovrBodySetUserData(Body* body, void* data);
 World* lovrBodyGetWorld(Body* body);
+float lovrBodyGetMass(Body* body);
+void lovrBodySetMass(Body* body, float mass);
 
 void lovrShapeDestroy(const Ref* ref);
 ShapeType lovrShapeGetType(Shape* shape);