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[C++, Lua] Entity Logic

Started by Silvo Feb 16, 2007 at 6:10 PM 2 replies 1.5k views

Original Post

Feb 16, 2007 at 6:10 PM

G'day! I am intending to implement my entity logic in Lua scripts, but I have come to a problem. Originally I was intending to have a separate lua_State for each entity, each with the script of the entity logic loaded; however, some entities may use my GUI (also written in Lua), but there can only be one instance of that, and if each entity is in a different VM, then they could not all access the same GUI, just their own local versions of it (which would not work). My next idea was to make each entity an object in a Lua Table, all in the same VM, which would allow them to use the GUI. Basically what I am asking is what would be a good way to do this? Is my latter option a good way, or are there other tips and tricks that I am not aware of? How would you do it?

dmail

Feb 16, 2007 at 6:14 PM

I would use the one VM, to be honest I don't understand why you would want a different lua state for each entity.

Silvo

Feb 16, 2007 at 8:10 PM

Thank you for that. To be honest I don't know why I thought that a separate VM for each entity would be good... I just did.

JoshG

Mar 6, 2007 at 5:41 PM

Heya Silvo,

I went through the same thing last year. My current method is for each entity, I hold a reference to a lua table. that table uses a metatable based upon the type of entity it is...ie..monster, upgrade etc. (The metatable is being assigned using luabind)

When I load a script for the entity, I change the lua environment to the entity's table, this way all the functions for the entity are loaded into it's own personal table. That way they don't interfer with global functions etc, and I can still access any global variables that I might need.

Hope this helps a little, It's a little confusing if you havn't used luabind before...

--Josh

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