Running App.lua in C++ version?

[Guppy]

In an effort to keep thing simple I decided to try and move my entire game loop to lua rather than c++.

 

Unfortunately it seems that this file isn't called from the c++ version - I get why as it would duplicate functionality.

 

But even so I wanted to do it, the plan was;

 

Enity* app;

bool App::Start()
{
   /* set up anything that lua migth need */
   app = Pivot:Create();
   app->CallFunction('Start');
   //Attach 'scripts/App.lua' to app here
   /*extra c++ stuff that lua dont care about here*/
}

bool App::Loop()
{
   if ( !app->CallFunction('Loop') ) { return false; }

}

 

But as far as I can see there is no possible way of attaching that script?

 

 

I may be braving uncharted waters here, but I think it should be possible to use the C++ version as "lua version with c++ stuff added in"

[nick.ace]

One up on this as well. I want to know if this is possible, because I love Lua, but I also want to possibly access C++ libraries and commands in the future.

[Rick]

nick.ace you can do this now with a C++ project. You can still use Lua with a C++ project. Guppy is looking for an App.lua type of functionality with a C++ project though I'm not 100% sure why it's needed. Maybe so changing resolutions doesn't require a recompilation?

 

You could probably just make global functions (not part of App like App.lua) and call those directly?

 

App.lua

function Start()
return true
end

function Loop()
return true
end

if Start() then
while Loop() do end
end

 

 

Leadwerks::Interpreter::ExecuteFile() would probably let you load an App.lua that looks like the above to start the code.

 

If you wanted the C++ Start() & Loop() then maybe Leadwerks::Interpreter::EvaluateString("Loop()"); (and Start()) after Executing the file first to load the functions into the global table would work.

[nick.ace]

I know you can use Lua in a C++ project, but I want to do something very similar to what Guppy is doing, where App.lua is being wrapped into C++ code. Basically, then you can program App.lua in Lua (so its quick for testing in the editor) but then you can add extra functionality with C++ libraries. Josh once told me it was possible and quite simple to do this, but I haven't had the time or need to try it out just yet.

[Rick]

How about something like this

 

 

App.lua

App = {}

function App:Start()
  return true
end

function App:Loop()
  return true
end

 

In C++

bool App:Start()
{
  Leadwerks::Interpreter::ExecuteFile("App.lua")

  // now you can push the App table and call it's Start() function and get it's return value and return that or
  Leadwerks::Interpreter::EvaluateString("App:Start()");
}

bool App:Loop()
{
  // again push App table and call Loop() and get return value and return that here or
  Leadwerks::Interpreter:EvaluateString("App:Loop()");
}

[Crazycarpet]

Just copy the code from the C++ source files of a Lua project and replace the C++ source files in your C++ project with the ones from the Lua project, then use the normal App.lua file from a Lua project and edit it as you please, this would make it behave the same way as a Lua project but you'd still be able to code C++ in your project.

 

This is what I did, I find it works the best.

[nick.ace]

That looks like it would work well. Thanks Rick! I'll test it out later when I get time. Is the Interpreter class somewhere in the documentation?

 

Could you not just copy the code from the C++ source files of a Lua project and replace your C++ source files with the ones from the Lua project, then App.lua would be the same as if it were a Lua project but you'd still be able to code C++ in your project.

 

Oh I hadn't thought about that. Where are these C++ source files located?

[Rick]

Yeah do what Crazy says. It basically is what I was saying but it creates the App table inside C++ vs the App.lua file. It's funny that the C++ source is still there for Lua projects but no VS project is created. Interesting.

[Crazycarpet]

That looks like it would work well. Thanks Rick! I'll test it out later when I get time. Is the Interpreter class somewhere in the documentation?

 

 

 

Oh I hadn't thought about that. Where are these C++ source files located?

 

Same place as the C++ project's source files.

Leadwerks/Projects/<Your Project>/Source/

[nick.ace]

Oh I see! Thanks! This solves a ton of issues going forward.

[Crazycarpet]

Oh I see! Thanks! This solves a ton of issues going forward.

 

Not a problem, good luck with your future projects!

[Guppy]

Just copy the code from the C++ source files of a Lua project and replace the C++ source files in your C++ project with the ones from the Lua project, then use the normal App.lua file from a Lua project and edit it as you please, this would make it behave the same way as a Lua project but you'd still be able to code C++ in your project.

 

This is what I did, I find it works the best.

Oh I honestly didnt even look for that do not make much sende for the c++ code to be there, but very handy that it is

[Crazycarpet]

Oh I honestly didnt even look for that do not make much sende for the c++ code to be there, but very handy that it is

 

Yeah, I was quite happy to see it there haha, hope it helps! Good luck!