htanks/Game.hs

{-# LANGUAGE GeneralizedNewtypeDeriving #-}

module Game ( GameState(..)
            , Game
            , runGame
            ) where

import Level
import Tank
import Texture

import Control.Monad
import Control.Monad.State
import qualified Data.Map as M


data GameState = GameState
    { level    :: !Level
    , tanks    :: ![Tank]
    , textures :: !(M.Map Texture TextureObject)
    } deriving (Show)

newtype Game a = Game (StateT GameState IO a)
    deriving (Monad, MonadIO, MonadState GameState)

runGame :: GameState -> Game a -> IO (a, GameState)
runGame st (Game a) = runStateT a st