diff --git a/src/Types.hs b/src/Types.hs
new file mode 100644
index 0000000..c896bba
--- /dev/null
+++ b/src/Types.hs
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+module Types where
+
+import           Control.Concurrent.STM               (TQueue)
+import qualified Graphics.Rendering.OpenGL.GL         as GL
+import           Graphics.UI.SDL                      as SDL
+import           Foreign.C                            (CFloat)
+import           Data.Time                            (UTCTime)
+import Linear.Matrix (M44)
+import Control.Monad.RWS.Strict (RWST)
+import Graphics.UI.SDL.TTF.Types as TTF
+
+
+
+
+data ArrowKeyState = ArrowKeyState {
+         arrowUp      :: !Bool
+        ,arrowDown    :: !Bool
+        ,arrowLeft    :: !Bool
+        ,arrowRight   :: !Bool
+}
+
+--Static Read-Only-State
+data Env = Env
+    { envEventsChan    :: TQueue Event
+    , envWindow        :: !Window
+    , envZDistClosest  :: !Double
+    , envZDistFarthest :: !Double
+    --, envGLContext     :: !GLContext
+    , envFont          :: TTF.TTFFont
+    }
+
+--Mutable State
+data State = State
+    { stateWindowWidth     :: !Int
+    , stateWindowHeight    :: !Int
+    , stateWinClose        :: !Bool
+    , stateClock           :: !UTCTime
+    --- IO
+    , stateXAngle          :: !Double
+    , stateYAngle          :: !Double
+    , stateZDist           :: !Double
+    , stateMouseDown       :: !Bool
+    , stateDragging        :: !Bool
+    , stateDragStartX      :: !Double
+    , stateDragStartY      :: !Double
+    , stateDragStartXAngle :: !Double
+    , stateDragStartYAngle :: !Double
+    , statePositionX       :: !Double
+    , statePositionY       :: !Double
+    , stateCursorPosX      :: !Double
+    , stateCursorPosY      :: !Double
+    , stateArrowsPressed   :: !ArrowKeyState
+    , stateFrustum         :: !(M44 CFloat)
+    --- pointer to bindings for locations inside the compiled shader
+    --- mutable because shaders may be changed in the future.
+    , shdrVertexIndex      :: !GL.AttribLocation
+    , shdrColorIndex       :: !GL.AttribLocation
+    , shdrNormalIndex      :: !GL.AttribLocation
+    , shdrProjMatIndex     :: !GL.UniformLocation
+    , shdrViewMatIndex     :: !GL.UniformLocation
+    , shdrModelMatIndex    :: !GL.UniformLocation
+    , shdrNormalMatIndex   :: !GL.UniformLocation
+    , shdrTessInnerIndex   :: !GL.UniformLocation
+    , shdrTessOuterIndex   :: !GL.UniformLocation
+    , stateTessellationFactor :: !Int
+    --- the map
+    , stateMap             :: !GL.BufferObject
+    , mapVert              :: !GL.NumArrayIndices
+    }
+
+type Pioneers = RWST Env () State IO
\ No newline at end of file
diff --git a/src/UI/Callbacks.hs b/src/UI/Callbacks.hs
new file mode 100644
index 0000000..b4daff3
--- /dev/null
+++ b/src/UI/Callbacks.hs
@@ -0,0 +1,20 @@
+module UI.Callbacks where
+
+import Control.Monad.Trans (liftIO)
+import Types
+
+data Pixel = Pixel Int Int
+
+-- | Handler for UI-Inputs.
+--   Indicates a primary click on something (e.g. left-click, touch on Touchpad, fire on Gamepad, ...
+clickHandler :: Pixel -> Pioneers ()
+clickHandler (Pixel x y) = liftIO $ putStrLn $ unwords ["button press on (",show x,",",show y,")"]
+
+-- | Handler for UI-Inputs.
+--   Indicates an alternate click on something (e.g. right-click, touch&hold on Touchpad, ...
+alternateClickHandler :: Pixel -> Pioneers ()
+alternateClickHandler (Pixel x y) = liftIO $ putStrLn $ unwords ["alternate press on (",show x,",",show y,")"]
+
+
+--TODO: Add scroll-Handler, return (Pioneers Bool) to indicate event-bubbling etc.
+--TODO: Maybe queues are better?