Lua lets the programmer write against a generic interface and worry about the implementation later. This separation between game logic, and the nuts and bolts of presenting the audio/visual elements of the game, is an important part of any game engine. In this recipe, we will use Lua to create a small story-based adventure game.
Execute the following code:
//Static C functions
static int ldtLogic(lua_State * l) {
int num = [ldtRecipe logic:[NSString stringWithUTF8String:lua_tostring(l,1)]];
lua_pushnumber(l,num);
return 1;
}
static int ldtPresentOptions(lua_State * l) {
[ldtRecipe presentOptions];
ldtRecipe.sc->YieldPause();
return (lua_yield(l, 0));
}
@implementation Ch7_LuaDecisionTree
/* Logic callback */
-(int) logic:(NSString*)str {
int num = 0;
if([str isEqualToString:@"Put guns down"]){
gunsDown = YES;
}else if([str...