tessellation-factor is now adaptive

- tessellation gets reduced in distance
- tess-factor is now adaptive

src/Main.hs

@@ -132,6 +132,7 @@ main =
                         }
               , _io                  = IOState
                         { _clock               = now
+                        , _tessClockFactor     = 0
                         }
               , _mouse               = MouseState
                         { _isDown              = False
@@ -234,23 +235,24 @@ run = do
 		targetFrametime = 1.0/targetFramerate
 		targetFrametimeμs = targetFrametime * 1000000.0
         now <- getCurrentTime
-        diff <- return $ diffUTCTime now (state ^. io.clock) -- get time-diffs
-        title <- return $ unwords ["Pioneers @ ",show ((round . double $ 1.0/diff)::Int),"fps"]
+        let diff  = diffUTCTime now (state ^. io.clock) -- get time-diffs
+            title = unwords ["Pioneers @ ",show ((round . double $ 1.0/diff)::Int),"fps"]
         setWindowTitle (env ^. windowObject) title
         let 	sleepAmount = floor ((targetFrametime - double diff)*1000000) :: Int -- get time until next frame in microseconds
+                clockFactor = (state ^. io.tessClockFactor)
 		tessChange
-			| (sleepAmount > (floor $0.1*targetFrametimeμs)) && (state ^. gl.glMap.stateTessellationFactor < 5) = ((+)1 :: Int -> Int) 
+			| (clockFactor > (2*targetFrametimeμs)) && (state ^. gl.glMap.stateTessellationFactor < 5) = ((+)1 :: Int -> Int) 
 									-- > factor < 5 & 10% of frame idle -> increase graphics
 			| sleepAmount < 0 && (state ^. gl.glMap.stateTessellationFactor > 1) = (flip (-) 1 :: Int -> Int)
 									-- frame used up completely -> decrease
 			| otherwise = ((+)0 :: Int -> Int)              -- 0ms > x > 10% -> keep settings
         when (sleepAmount > 0) $ threadDelay sleepAmount
-	print targetFrametimeμs
         return (now,tessChange,sleepAmount)
     -- set state with new clock-time
     modify $ (io.clock .~ mt)
            . (gl.glMap.stateTessellationFactor %~ tc)
-    liftIO $ putStrLn $ concat $ ["TessFactor at: ",show (state ^. gl.glMap.stateTessellationFactor), " - slept for ",show sleepAmount, "μs."]
+           . (io.tessClockFactor %~ (((+) (fromIntegral sleepAmount)).((*) 0.99)))
+    -- liftIO $ putStrLn $ concat $ ["TessFactor at: ",show (state ^. gl.glMap.stateTessellationFactor), " - slept for ",show sleepAmount, "μs."]
     shouldClose' <- return $ state ^. window.shouldClose
     unless shouldClose' run
 

src/Types.hs

@@ -51,6 +51,7 @@ data CameraState = CameraState
 
 data IOState = IOState
     { _clock               :: !UTCTime
+    , _tessClockFactor     :: !Double
     }
 
 data GameState = GameState