RE: Game Integration

[Chris Brodie <Chris.Brodie@...>]

> -----Original Message-----
> From: Ignacio Castaño [mailto:castanyo@yahoo.es]
> Sent: Wednesday, 21 May 2003 11:50 AM
> To: Lua list
> Subject: Re: Game Integration
> 
> 
> Sorry Chris, that's what you would do on the C side:
> 
> First, create your main lua state with lua_open.
> 
> Create a new thread for each scripts that you want to run in 
> parallel, that
> is a state with its own stack.
> 
> Instead of lua_dofile, use lua_load or any of the functions 
> that provides
> the aux library (ie. luaL_loadbuffer). That parses your 
> script and leaves
> the main function on the top of the stack.
> 
> Instead of using lua_pcall to run that function, use 
> lua_resume, that way,
> it will yield when it finds a yield function. You can resume 
> the thread as
> many times as you want, but you will have to use some kind of 
> return codes
> to determine the end of the execution (or use lua_getstack).
> 
> while(1) {
>     lua_resume( thread, 0 );
> 
>     // check return code
>     if( !lua_isnil( thread ) ) break;
> 
>     // render your world
>     ...
> }
> 
> 
> > Ignacio, are you suggesting that my game script need to 
> call in to my C
> > code to 'resume'. If that is so doesn't it mean that the 
> misson script
> will
> > need to know how to drive the game, rather than just be 
> concerned about
> the
> > mission at hand?
> 
> I was suggesting the use of a message queue to have better 
> control over the
> execution of the script. Instead of resuming the script every 
> frame you
> could do it just when the script wants, that is, after a few 
> seconds, when
> an animation ends, when some event happens, etc.
> 
> 
> Hope that helps,
> 
> 
> Ignacio Castaño
> castanyo@yahoo.es
> 
> 
> Chris Brodie wrote:
> I still cannot see how I can get the C code working. How do I stop my
> lua_dofile from blocking my applications main loop from executing?
> 
> For example I run a script that runs my mission. How can the 
> game render
> while the mission is running? The script never returns. If someone can
> suggest a way that doesn't block my games code from executing 
> I'll also need
> some kind of C function to resume that script periodically.
> 
> I thank everyone for their help but nobody seems to suggest 
> what I should be
> doing ni C to make this all work.
> 
> Ignacio, are you suggesting that my game script need to call 
> in to my C code
> to 'resume'. If that is so doesn't it mean that the misson 
> script will need
> to know how to drive the game, rather than just be concerned about the
> mission at hand?
> 
> 
> 


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