renderer-tutorial/src/EventHandler.hs

71 lines
1.9 KiB
Haskell

module EventHandler where
import Control.Concurrent.MVar
import Linear
import qualified SDL
import qualified Graphics.Rendering.OpenGL as GL
moveQuad
:: MVar (M44 GL.GLfloat)
-> MVar (M44 GL.GLfloat)
-> MVar (M44 GL.GLfloat)
-> MVar [SDL.Event]
-> IO ()
moveQuad proj view model evs =
modifyMVar_ proj (\mproj -> do
modifyMVar_ view (\mview -> do
modifyMVar_ model (\mmodel -> do
plusModel <- foldl (\acc ev -> case SDL.eventPayload ev of
(SDL.KeyboardEvent
( SDL.KeyboardEventData
_
SDL.Pressed
_
(SDL.Keysym _ code mod)
))
->
let trans =
mkTransformationMat
(identity :: M33 GL.GLfloat)
( ( if not (SDL.keyModifierLeftShift mod)
then (-1)
else 1
)
*
( case code of
SDL.KeycodeX ->
V3 1 0 0
SDL.KeycodeY ->
V3 0 1 0
_ ->
V3 0 0 0
)
)
!-!
(identity :: M44 GL.GLfloat)
in acc !+! trans
_ -> acc !+!
(V4
(V4 0 0 0 0)
(V4 0 0 0 0)
(V4 0 0 0 0)
(V4 0 0 0 0)
)
)
(V4
(V4 0 0 0 0)
(V4 0 0 0 0)
(V4 0 0 0 0)
(V4 0 0 0 0)
)
<$> readMVar evs
return $ mmodel !+! plusModel
)
return mview
)
return mproj
)