I want to implement Lua into my game engine, and I want it to be event driven. For it, I want to export to Lua an "entity" class (i think i wil use ToLua++ or LuaBind to do that). Every entity will represent an element in the scene. This elements will have an ''OnUpdate'' method, which will be called by the engien every frame. So, when you create a new entity in the script, you must code its functionality on its OnUpdate method. When a frame occurs, the host application has to loop though all the entity instances created by the script, and execute its ''OnUpdate'' function. Does anybody know how can I do that?

How can I create new entities from the scripts then?

Dump all the entities in a table and iterate through it each frame.

Anybody knows where I can find a good example on how to implement Lua in a game engine?

In fact, I would prefer to use a more C-like scripting language, but Lua is a very widely used scripting language these days, which tells me that it is not a bad choice. The problem is that I find the Lua documentation very disappointing.

I pretend to make a game engine which is completely scriptable, so with the same engine i can make two very different type of games. I was thinking about something like:

A Game object with some methods like: OnInit(), OnUpdate(), OnFinish(). Game.OnInit() will be called by the engine at initialization, so basic stuff is done. Then, every frame, the Game.OnUpdate() function will be called. There would be a Game.SetSate(state) function that would allow you to set the state to different values (without a predefined meaning, this is up to the user). On Game.OnUpdate(), you would check the current state and act consequently (for example, is state is GS_MENU, it would call the function which creates the menu, if its GS_LOADMAP, it loads the next game map, if its GS_DEFAULT, doesn''t do anything, or if it''s GS_END, it calls Game.Finish() to exit the game).

You should be able to create entities to place in your map. There would be a function like CreateEntity(type), where ''type'' is a string containing the type of entity. If type is ''Player'', for example, every frame, after calling Game.OnUpdate(), the OnUpdate() method of the player will be called.

Thanks, I am seriously considering the Small option, because I am startign to feel disappointed by Lua. Anyway, I''ve heard that Small is only capable of executing bytecode scripts... can''t you load source scripts directly, and let the virtual mchine compile them when loading?