1 files changed, 67 insertions, 0 deletions
diff --git a/render/Render.hs b/render/Render.hs
new file mode 100644
index 0000000..9126032
--- /dev/null
+++ b/render/Render.hs
@@ -0,0 +1,67 @@
+{-# LANGUAGE BlockArguments #-}
+{-# LANGUAGE FlexibleContexts #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE PatternSynonyms #-}
+{-# LANGUAGE TypeApplications #-}
+{-# LANGUAGE ViewPatterns #-}
+module Main where
+
+import qualified Codec.Picture.Png as PNG
+import qualified Codec.Picture.Types as Pix
+import qualified Data.ByteString.Lazy as BSL
+import qualified Data.Serialize as Ser
+import Data.Word
+import qualified Data.Vector.Storable as VS
+import System.Environment (getArgs)
+import System.Exit (die, exitFailure)
+
+import MandelHSlib
+
+
+colorscheme :: (Ord a, Floating a, RealFrac a) => a -> (Word8, Word8, Word8)
+colorscheme fraction =
+  let x = max 0 fraction ** 0.3
+      bg = 0.2 * (1 - curve x (-0.1) 0.2)
+  in (tow8 $ bg + curve x 0 0.4 - 0.8 * curve x 0.6 1.0
+     ,tow8 $ bg + 0.8 * curve x 0.3 0.7
+     ,tow8 $ bg + curve x 0.6 1.0)
+  where
+    tow8 x = round (max 0 (min 255 (x * 255)))
+    curve x start end
+      | x <= start = 0
+      | x >= end = 1
+      | otherwise = sin (pi/(end-start) * (x - start) - pi/2) / 2 + 0.5
+
+renderFractal :: (Ord a, Floating a, RealFrac a, VS.Storable a) => Fractal a -> Pix.Image Pix.PixelRGB8
+renderFractal (Fractal (w, h) _ arr) =
+  Pix.Image w h $ VS.fromList
+    [val
+    | fraction <- VS.toList arr
+    , let (r, g, b) = colorscheme fraction
+    , val <- [r, g, b]]
+
+usage :: String
+usage =
+  "Usage: mandelhs-render <infile.data> <outfile.png>\n"
+
+main :: IO ()
+main = do
+  -- let (w, h) = (4 * 2000, 4 * 1500)
+  --     maxiter = 1024
+
+  args <- getArgs
+  case args of
+    [infile, outfile] -> do
+      datafile <- BSL.readFile infile
+      Fractal (w, h) _ arr <- case Ser.runGetLazy Ser.get datafile of
+        Left err -> die err
+        Right res -> return res
+      BSL.writeFile outfile $
+        PNG.encodePng $
+          Pix.Image @Pix.PixelRGB8 w h $ VS.fromList
+            [val
+            | fraction <- VS.toList arr
+            , let (r, g, b) = colorscheme @Double fraction
+            , val <- [r, g, b]]
+
+    _ -> putStr usage >> exitFailure