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|
{-# LANGUAGE PatternGuards, GeneralizedNewtypeDeriving #-}
import Game
import Level
import Render
import Tank
import Player
import CPUPlayer
import DefaultPlayer
import GLDriver
import GLX
import Control.Concurrent (threadDelay)
import Control.Monad.State
import Data.Fixed
import Data.Maybe
import qualified Data.Map as M
import Data.Ratio
import qualified Data.Set as S
import Data.Time.Clock
data MainState = MainState
{ run :: !Bool
, driver :: !SomeDriver
, time :: !UTCTime
, players :: ![SomePlayer]
}
newtype MainT m a = MainT (StateT MainState m a)
deriving (Monad, MonadState MainState, MonadIO, MonadTrans)
type Main = MainT Game
runMain :: MainState -> Main a -> Game (a, MainState)
runMain st (MainT a) = runStateT a st
main :: IO ()
main = do
gl <- initGL glxDriver
when (initialized gl) $ do
currentTime <- getCurrentTime
let mainState = MainState {run = True, driver = SomeDriver gl, time = currentTime, players =
[ SomePlayer $ DefaultPlayer S.empty 0 0
, SomePlayer $ CPUPlayer 0
]}
gameState = GameState {level = testLevel, tanks = [ Tank 0.0 0.0 0 0 2 360 False
, Tank 0.0 (-1.5) 0 0 2 360 False
], textures = M.empty}
runGame gameState $ do
setup
runMain mainState mainLoop
deinitGL gl
minFrameTime :: NominalDiffTime
minFrameTime = 0.01
mainLoop :: Main ()
mainLoop = do
gl <- gets driver
t <- gets time
handleEvents
lift render
liftIO $ swapBuffers gl
rtime <- liftIO getCurrentTime
let drender = diffUTCTime rtime t
when (drender < minFrameTime) $
liftIO $ threadDelay $ truncate $ 1e6*(minFrameTime - drender)
currenttime <- liftIO getCurrentTime
let d = round $ 1e3*(diffUTCTime currenttime t)
replicateM_ d simulationStep
let newtime = addUTCTime ((1e-3)*(fromIntegral d)) t
modify $ \state -> state {time = newtime}
runnext <- gets run
when runnext mainLoop
updateAngle :: Micro -> State Tank ()
updateAngle angle = do
oldangle <- gets dir
tspeed <- gets turnspeed >>= return . (/1000)
let diff = angle - oldangle
let diff360 = if (diff > 180)
then (diff-360)
else if (diff <= -180)
then (diff+360)
else diff
let (diff180, angle180) = if (diff360 > 90)
then (diff360-180, oldangle+180)
else if (diff360 <= -90)
then (diff360+180, oldangle-180)
else (diff360, oldangle)
let turn = if (diff180 > tspeed)
then tspeed
else if (diff180 < -tspeed)
then (-tspeed)
else diff180
let newangle = angle180 + turn
let newangle180 = if (newangle > 180)
then (newangle-360)
else if (newangle <= -180)
then (newangle+360)
else newangle
modify $ \tank -> tank {dir = newangle180}
updateTank :: Maybe Micro -> Bool -> Maybe Micro -> State Tank ()
updateTank angle move aangle = do
when (isJust angle) $
updateAngle $ fromJust angle
when (isJust aangle) $
modify $ \tank -> tank {aim = fromJust aangle}
when move $ do
tdir <- gets dir
tspeed <- gets speed
moved <- gets moving
when (isNothing angle || (isJust angle && (tdir == fromJust angle)) || moved) $ do
let anglej = (fromRational . toRational $ tdir)*pi/180
x = tspeed * fromRational (round ((cos anglej)*1000)%1000000)
y = tspeed * fromRational (round ((sin anglej)*1000)%1000000)
modify $ \tank -> tank {posx = x + posx tank, posy = y + posy tank, moving = True}
when (not move) $ do
modify $ \tank -> tank {moving = False}
simulationStep :: Main ()
simulationStep = do
oldplayers <- gets players
oldtanks <- lift $ gets tanks
let pt = unzip $ map updateTank' $ zip oldplayers oldtanks
modify $ \state -> state {players = fst pt}
lift $ modify $ \state -> state {tanks = snd pt}
where
updateTank' (player, tank) = let (p, angle, move, aangle) = playerUpdate player tank
t = execState (updateTank angle move aangle) tank
in (p, t)
handleEvents :: Main ()
handleEvents = do
event <- gets driver >>= liftIO . nextEvent
when (isJust event) $ do
Main.handleEvent $ fromJust event
modify $ \state -> state {players = map (\p -> Player.handleEvent p $ fromJust event) $ players state}
handleEvents
handleEvent :: SomeEvent -> Main ()
handleEvent ev
| Just QuitEvent <- fromEvent ev = modify $ \state -> state {run = False}
| otherwise = return ()
|
