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{-# LANGUAGE MultiParamTypeClasses #-}
--{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE TypeSynonymInstances #-}
module Main where
import Spear.App
import Spear.Game
import Spear.Math.AABB
import qualified Spear.Math.Matrix3 as Matrix3
import qualified Spear.Math.Matrix4 as Matrix4
import Spear.Math.Spatial
import Spear.Math.Spatial2
import Spear.Math.Vector
import Spear.Physics.Collision
--import Spear.Prelude
import Spear.Render.Core.Pipeline
import Spear.Render.Core.State
import Spear.Render.Immediate
import Spear.Sound.Sound
import Spear.Sound.State
import Spear.Window
import Control.Monad (when)
import Spear.Math.Vector (Vector3)
ballSize = 0.01
numBalls = 1000
data Ball = Ball
{ ballPosition :: {-# UNPACK #-} !Vector2
, ballVelocity :: {-# UNPACK #-} !Vector2
}
instance Positional Ball Vector2 where
setPosition p ball = ball { ballPosition = p }
position = ballPosition
translate v ball = ball { ballPosition = v + ballPosition ball }
instance Bounded2 Ball where
boundingVolume ball = aabb2Volume $ translate (ballPosition ball) (AABB2 (-size) size)
where size = vec2 s s
s = ballSize / (2::Float)
data World = World
{ viewProjection :: Matrix4.Matrix4
, balls :: [Ball]
}
type GameState = AppState World
options = defaultAppOptions { title = "Balls" }
app = App options initGame endGame step render resize
main :: IO ()
main = runApp app
initGame :: Game AppContext World
initGame =
let
world = zipWith Ball positions velocities
positions = (+vec2 0.5 0.5) . makePosition <$> numbers
makePosition i = radius * vec2 (sin (f*i)) (cos (f*i))
velocities = makeVelocity <$> numbers
makeVelocity i = scale speed $ vec2 (sin (f*i)) (cos (f*i))
numbers = [1..numBalls]
f = 2*pi / numBalls
radius = 0.05
speed = 0.4
in
return $ World Matrix4.id world
endGame :: Game GameState ()
endGame = return ()
step :: Elapsed -> Dt -> [InputEvent] -> Game GameState Bool
step elapsed dt inputEvents = do
modifyGameState $ \world -> world
{ balls = moveBalls dt $ balls world
}
return (not $ exitRequested inputEvents)
exitRequested = elem (KeyDown KEY_ESC)
moveBalls :: Elapsed -> [Ball] -> [Ball]
moveBalls dt = (bounceBall dt . moveBall dt <$>)
moveBall :: Elapsed -> Ball -> Ball
moveBall dt ball = translate (scale (realToFrac dt) $ ballVelocity ball) ball
bounceBall :: Elapsed -> Ball -> Ball
bounceBall dt ball =
let
(AABB2Volume (AABB2 pmin pmax)) = boundingVolume ball
sideCollision = x pmin < 0 || x pmax > 1
backCollision = y pmin < 0 || y pmax > 1
flipX v@(Vector2 x y) = if sideCollision then vec2 (-x) y else v
flipY v@(Vector2 x y) = if backCollision then vec2 x (-y) else v
velocity = ballVelocity ball
velocity'
= flipX
. flipY
$ velocity
collision = velocity' /= velocity
-- Apply offset when collision occurs to avoid sticky collisions.
delta = if collision then 1 else 0
dt' = realToFrac dt
in
ball
{ ballPosition = ballPosition ball + scale (delta * dt') velocity'
, ballVelocity = velocity'
}
render :: Game GameState ()
render = do
gameState <- getGameState
siblingGame $ do
immStart
immSetViewProjectionMatrix (viewProjection gameState)
-- Clear the background to a different colour than the playable area to make
-- the latter distinguishable.
setClearColour (0.2, 0.2, 0.2, 0.0)
clearBuffers [ColourBuffer]
render' $ balls gameState
immEnd
render' :: [Ball] -> Game ImmRenderState ()
render' balls = do
immLoadIdentity
renderBackground
-- Draw objects.
immSetColour (vec4 1.0 1.0 1.0 1.0)
mapM_ renderBall balls
renderBackground :: Game ImmRenderState ()
renderBackground =
let pmin = 0 :: Float
pmax = 1 :: Float
in do
immSetColour (vec4 0.0 0.25 0.41 1.0)
immDrawQuads2d [
(vec2 pmin pmin
,vec2 pmax pmin
,vec2 pmax pmax
,vec2 pmin pmax)]
renderBall :: Ball -> Game ImmRenderState ()
renderBall ball =
let (AABB2Volume (AABB2 (Vector2 xmin ymin) (Vector2 xmax ymax))) = boundingVolume ball
in
immDrawQuads2d [
(vec2 xmin ymin
,vec2 xmax ymin
,vec2 xmax ymax
,vec2 xmin ymax)]
resize :: WindowEvent -> Game GameState ()
resize (ResizeEvent w h) =
let r = fromIntegral w / fromIntegral h
pad = if r > 1 then (r-1) / 2 else (1/r - 1) / 2
left = if r > 1 then -pad else 0
right = if r > 1 then 1 + pad else 1
bottom = if r > 1 then 0 else -pad
top = if r > 1 then 1 else 1 + pad
in do
setViewport 0 0 w h
modifyGameState $ \pong -> pong {
viewProjection = Matrix4.ortho left right bottom top (-1) 1
}
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