Learn & Master Cocos2D Game Development

KoboldScript is coming! KoboldScript brings Lua scripting to Cocos2D and Kobold2D, with Objective-C performance for the StateMachine part and faster-than-Wax performance for the runtime Lua functions.

More details and first looks at some early development scripts in this LearnCocosTV episode. I’ll have something more visual to show in 2-4 weeks.

Episode #5 – Pretty State Machine

• KoboldScript: Lua Scripting for Cocos2D & Kobold2D
o Poll: Which scripting language for Cocos2D?
o iDevBlogADay: Text Editors for Lua
• KoboldScript combines:
o Lua StateMachine generator (full ObjC performance)
o Runtime Lua functions (faster than Wax)

Very early KoboldScript sample script

testLuaFunctionParams = {
   [1] = "one",
   one = 1,
   ones = 111,
   wahr = true,
   falsch = false,
   counter = 0,
}

function conditionTestFunction(params)
   params.counter = params.counter + 1
   if (params.counter >= 166) then 
      params.counter = 0
      return true
   end
   return false
end

function actionTestFunction(params)
   print("AAAAACTION!!!!!!!!!!!!!!!!!!!!")
end

StateMachine
{
   Name = "my Machine",
   
   State
   {
      Name = "first State",

      OneTimeEvent
      {
         Conditions
         {
         };
         Actions
         {
            -- Objective-C style with named parameters ...
            VariableAssign{Name = "my good var", Value = -123},
            -- ... and shorter C-style can be used interchangeably!
            VariableAssign("my evil var", 678),

            TimerStart("ding-dong"),
            DebugLogMessage("VERY FIRST STEP"),

            StateMachineSetActiveState{Name = "2nd state"},
         };
      };

      NonStopEvent
      {
         Conditions
         {
            LuaFunctionReturnsTrue{Function = "conditionTestFunction", 
                                   Table = "testLuaFunctionParams"},
         };
         Actions
         {
            DebugLogMessage{Message = "testLuaFunction SUCCESS"},
            LuaFunctionExecute{Function = "actionTestFunction", 
                               Table = "testLuaFunctionParams"},
         };
      };

      NonStopEvent
      {
         Conditions
         {
            TimerIsElapsed{Name = "ding-dong", 
                           Steps = secondsToSteps(10)},
         };
         Actions
         {
            DebugLogMessage{Message = "DING DONG DING DONG DING DONG"},
            TimerStart("ding-dong"),
         };
      };

      PeriodicEvent
      {
         IntervalSteps = secondsToSteps(0.5), -- check twice per second
         Conditions
         {
            OR
            {
               TimerIsElapsed{Name = "ding-dong", 
                              Steps = secondsToSteps(2)},
               TimerIsElapsed{Name = "ding-dong",
                              Steps = secondsToSteps(5)},
            };
         };
         Actions
         {
            DebugLogMessage("time passed ..."),
         };
      };
   };

   -- alternative style (if you prefer K&R style ... me? <shudders>)
   State {
      Name = "2nd state",

      NonStopEvent {
         Conditions {
            TimerIsElapsed{Name = "ding-dong",
                           Steps = secondsToSteps(3)},
         }; 
         Actions {
            StateMachineSetActiveState{Name = "first State"},
            DebugLogMessage{Message = "... and back!"},
         };
      };
   };
};