Hacking Burger Time with Lua | Lobsters

11

Hacking Burger Time with Lua assembly historical stefan.arentz.ca
authored by st3fan 6 years ago | archive
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| 5 comments

5

1. 3
  
  catwell edited 6 years ago | link
  
  Bitwise operations in Lua are a bit of a pain unfortunately. I will probably introduce a more convenient API to access 16 bit values.
  
  Maybe you could just update to Lua 5.3, which has bitwise operators.
  
  I am curious why you went with 5.2 in the first place. Maybe in prevision for LuaJIT?
  1. 3
    
    nikola 6 years ago | link
    
    For what it’s worth, LuaJIT includes the Lua BitOp module. BitOp is also available as a standard C module for Lua 5.1/5.2, so you can get a consistent API and semantics across both implementations. I have only used it very briefly, but it seems to be working rather well.
    1. 4
      
      catwell 6 years ago | link
      
      It is the same kind of API as bit32, unfortunately. The advantage of operators is that instead of this:
      
      v = bit32.bor(cpu.memory[0xfffc], bit32.lshift(cpu.memory[0xfffd], 8))
      
      you write this:
      
      v = cpu.memory[0xfffc] | cpu.memory[0xfffd] << 8
      1. 2
        
        st3fan 6 years ago | link
        
        I’m on 5.2 (and soon even 5.1) indeed so that i can give LuaJIT a try. If that does not work out or if the speed improvements are not worth it then I will probably just move to 5.3.
2. 2
  
  barbeque 6 years ago | link
  
  Pretty cool idea to tie a scripting API in to what is shaping up to be a fairly well-equipped Apple II emulator. Who needs a Game Genie?