Re: Lua Performance questions

[Christopher Eykamp <chris@...>]

Essentially, yes.  Here's a snippet from Bitfighter, a game I'm 
developing that uses Lua scripted robot players.  To get a robot's name, 
I call a function in the script called getName().  Here is the code I use:

  // Run the getName() function in the bot (will default to the one in 
robot_helper_functions if it's not overwritten by the bot)
  lua_getglobal(L, "getName");

  if (!lua_isfunction(L, -1) || lua_pcall(L, 0, 1, 0))     // Passing 0 
params, getting one back
  {
     mPlayerName = "Nancy";
     logError("Robot error retrieving name (%s).  Using \"%s\".", 
lua_tostring(L, -1), mPlayerName.getString());
  }
  else
  {
     mPlayerName = lua_tostring(L, -1);
     lua_pop(L, 1);
  }

I do not claim to be a master at integrating Lua with C++, but there are 
several working examples of working integration in my codebase.  You can 
access it via Sourceforge, and the files of most interest will likely be 
robot.cpp and luaLevelGenerator.cpp.

Chris


zweifel wrote:
> do you mean I can load a script called "melee.lua" and then call
>
> lua_getglobal(L, "melee.lua");
> lua_pcall(L, ...);
>
> is that it?
>
>
> 2009/9/23 Luiz Henrique de Figueiredo <lhf@tecgraf.puc-rio.br 
> <mailto:lhf@tecgraf.puc-rio.br>>
>
>     > I see.. so I can load all scripts at the beginning or at least
>     be sure to
>     > load at least one time before calling the function.
>     >
>     > But I have to be sure that every script has a different
>     function_name,
>     > otherwise I would be unable to call it. Is not it?
>
>     The script itself is an anonymous function.
>
>
>
>
> --
> God$ g++ -o earth earth.cpp -O3 -lanimals -lplants -lvirus
>
> http://fog.neopages.org/