Call custom physics engine written in c++ or to rewrite in Lua in terms of speed

Comments

• ar2rsawseen Maintainer

  November 2015 edited November 2015 Accepted Answer

  Hello @dominum018
  There are two things to consider.
  
  When using luajit, lua code (in some our tests) may even outperform c++ code (I was shocked, but its true). But the problem is that only Android and Desktop versions support luajit (I think it is on ios too, but it does not give such huge performance boost as on other platforms, due to apple limitations)
  
  If without luajit, then of course calling c++ and doing all heavy calculations there will be faster.
  
  And since you already wrote your code in c++, I think it would be easy for you to bind some interfaces to lua and use it as a plugin.
  
  Here is a great discussion on doing c++ plugins:
  http://giderosmobile.com/forum/discussion/1025/step-by-step-how-to-write-a-c-plugin-and-deploy-it-to-the-desktop-windows-player/p1
  
  As for best practices, then, as you have physics engine, I think the best way would be to
  
  1) set all coordinates and dimensions as they change in your Gideros Sprites
  so you would have up to date state of everything in your physics world in c++ too
  
  2) on enterframe call only one funciton, like world step, which would calculate all collisions and other things needed
  
  3) dispatch Gideros events from C++ on collisions and other events you want to track
  
  As Gideros is open sourced and so are many plugins, you can check all the code for examples, but if you have any questions, feel free to also ask here

  http://appcodingeasy.com/Gideros-Mobile

  +1 -1Share on Facebook
• SinisterSoft Maintainer

  November 2015

  Also consider allowing others to use the engine code, eg - see about actually adding it to Gideros.
  

  Coder, video game industry veteran (since the '80s, ❤'s assembler), arrested - never convicted hacker (in the '90s), dad of five, he/him (if that even matters!).
  https://deluxepixel.com

  +1 -1Share on Facebook