Topics

1

General / Tiled to SFML using lua.

« on: November 25, 2015, 11:08:41 pm »

Hey guys!

I found Tiled (http://www.mapeditor.org/) quite a while ago (I was using Unity) and found it really useful.

I want to be able to load "tiled.lua" files into my C++ program.

I am using LuaBridge(https://github.com/vinniefalco/LuaBridge) to do most of the heavy lifting.

But now I am stuck.
Let me show you how a Tiled map looks in lua:

bigtable
{
  version = "2.2.2.2.2"
  luaversion = "0.0.0.0.1"
  tilesets
  {
    name = "Rock"
    ...
    name = "Grass"
  }
  layers
  {
    data{0,0,0,0,0,0,0,0,0,1,2,3,4}
    ...
  }
}

So yeah it is a lot of information in a table.

Using LuaBridge you can use: getGlobal(luaState,"key") to get a handler to that key value and then cast it into the apropiate type.
But,how do I "get" things without using a name(a char*) just using an id for example like:

lua_State* L = luaL_newstate();
luaL_dofile(L, "../data/scripts/untitled.lua");
luaL_openlibs(L);
lua_pcall(L, 0, 0, 0);
LuaRef globalData = getGlobal(L, "globalData");
LuaRef someKey = getGlobal(L,2);//How to do this

I am not sure how it should be done :C

Sorry it the answer is really obvious but I can´t find it :C

2

General / Using a singleton pattern for a resource manager.

« on: November 23, 2015, 12:16:02 pm »

Before getting to the question let me explain my problem.

I´ve made a simple ResourceManager where I could add/get resources (sf::Textures,sf::Font etc) and I made it static inside a "Types" file (yeah , you start seeing the problem )

When I close the app it will crash (ntdll exception), that confused me a lot.I put down a few breakpoint and the exception was outside of my app.
So I searched google for an answer and I found that I can not use static global things with SFML because we dont know when they will be destroyed and that will cause a few problems.


After this small introduction , now the question.

How do I make a static/global class?

Can I use a singleton pattern like this:

http://www.yolinux.com/TUTORIALS/C++Singleton.html

#include <string>

class Logger{
public:
   static Logger* Instance();
   bool openLogFile(std::string logFile);
   void writeToLogFile();
   bool closeLogFile();

private:
   Logger(){};  // Private so that it can  not be called
   Logger(Logger const&){};             // copy constructor is private
   Logger& operator=(Logger const&){};  // assignment operator is private
   static Logger* m_pInstance;
};

That pattern holds the class as a static pointer, will be this a problem?

Thank you guys!