1 files changed, 86 insertions, 0 deletions

diff --git a/demos/pong/Main.hs b/demos/pong/Main.hs
new file mode 100644
index 0000000..8c379ec
--- /dev/null
+++ b/demos/pong/Main.hs
@@ -0,0 +1,86 @@
+module Main where
+
+import Pong
+
+import Spear.Math.AABB
+import Spear.Math.Spatial2
+import Spear.Math.Vector
+import Spear.Game
+import Spear.Window
+
+import Data.Maybe (mapMaybe)
+import qualified Graphics.Rendering.OpenGL.GL as GL
+import Graphics.Rendering.OpenGL.GL (($=))
+
+data GameState = GameState
+     { wnd     :: Window
+     , elapsed :: Double
+     , world   :: [GameObject]
+     }
+
+main = do
+     result <- run
+     case result of
+          Left err -> putStrLn err
+          Right _  -> return ()
+
+run = withWindow (640,480) [] Window (2,0) (Just "Pong") initGame
+    $ loop (Just 30) step
+
+initGame wnd = do
+         gameIO $ do
+                GL.clearColor $= GL.Color4 0.7 0.5 0.7 1.0
+                GL.matrixMode $= GL.Modelview 0
+                GL.loadIdentity
+         return $ GameState wnd 0 newWorld
+
+step :: Dt -> Game GameState Bool
+step dt = do
+     gs <- getGameState
+     evts <- events (wnd gs)
+     gameIO . process $ evts
+     let evts' = translate evts
+     modifyGameState $ \ gs -> gs
+                     { world = stepWorld (elapsed gs) dt evts' (world gs)
+                     , elapsed = elapsed gs + realToFrac dt }
+     getGameState >>= \gs -> gameIO . render $ world gs
+     return (not $ exitRequested evts)
+
+render world = do
+       GL.clear [GL.ColorBuffer]
+       mapM_ renderGO world
+       swapBuffers
+
+renderGO :: GameObject -> IO ()
+renderGO go = do
+         let (AABB2 (Vector2 xmin' ymin') (Vector2 xmax' ymax')) = aabb go
+             (Vector2 xcenter ycenter) = pos go
+             (xmin,ymin,xmax,ymax) = (f2d xmin', f2d ymin', f2d xmax', f2d ymax')
+         GL.preservingMatrix $ do
+            GL.translate (GL.Vector3 (f2d xcenter) (f2d ycenter) 0)
+            GL.renderPrimitive (GL.TriangleStrip) $ do
+               GL.vertex (GL.Vertex2 xmin ymax)
+               GL.vertex (GL.Vertex2 xmin ymin)
+               GL.vertex (GL.Vertex2 xmax ymax)
+               GL.vertex (GL.Vertex2 xmax ymin)
+
+process = mapM_ procEvent
+procEvent (Resize w h) = do
+          GL.viewport $= (GL.Position 0 0, GL.Size (fromIntegral w) (fromIntegral h))
+          GL.matrixMode $= GL.Projection
+          GL.loadIdentity
+          GL.ortho 0 1 0 1 (-1) 1
+          GL.matrixMode $= GL.Modelview 0
+procEvent _ = return ()
+
+translate = mapMaybe translate'
+translate' (KeyDown KEY_LEFT)  = Just MoveLeft
+translate' (KeyDown KEY_RIGHT) = Just MoveRight
+translate' (KeyUp   KEY_LEFT)  = Just StopLeft
+translate' (KeyUp   KEY_RIGHT) = Just StopRight
+translate' _ = Nothing
+
+exitRequested = any (==(KeyDown KEY_ESC))
+
+f2d :: Float -> GL.GLdouble
+f2d = realToFrac
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