update entity script semantics

res/content/base/scripts/drop.lua

@@ -1,12 +1,7 @@
-function on_spawn(eid)
-    print("spawn", eid)
+function on_despawn()
+    print("despawn")
 end
 
-function on_despawn(eid)
-    print("despawn", eid)
-end
-
-function on_grounded(eid)
-    local entity = stdcomp.new_Entity(eid) -- test
+function on_grounded()
     entity.transform:set_rot(mat4.rotate({0, 1, 0}, math.random()*360))
 end

res/modules/internal/stdcomp.lua

@@ -25,11 +25,25 @@ end
 
 -- Entity class
 
-local Entity = {__index={}}
+local Entity = {__index={
+    despawn=function(self) return entity.despawn(self.eid) end,
+}}
 
-return {new_Entity = function(eid)
-    local entity = setmetatable({eid=eid}, Entity)
-    entity.transform = new_Transform(eid)
-    entity.rigidbody = new_Rigidbody(eid)
-    return entity
-end}
+local entities = {}
+
+return {
+    new_Entity = function(eid)
+        local entity = setmetatable({eid=eid}, Entity)
+        entity.transform = new_Transform(eid)
+        entity.rigidbody = new_Rigidbody(eid)
+        entities[eid] = entity;
+        return entity
+    end,
+    remove_Entity = function(eid)
+        local entity = entities[eid]
+        if entity and entity.on_despawn then
+            entity.on_despawn()
+        end
+        entities[eid] = nil;
+    end
+}