Add demo

.gitignore

@@ -0,0 +1 @@
+/imgui.ini

Main.hs

@@ -1,18 +1,28 @@
 {-# LANGUAGE BlockArguments #-}
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE RankNTypes #-}
 
 module Main (main) where
 
 import Control.Exception
 import Control.Monad.IO.Class
 import Control.Monad.Managed
+import Data.Binary.Get (getInt16le, isEmpty, runGet)
+import qualified Data.ByteString as BS
+import Data.ByteString.Lazy (fromStrict)
+import Data.List (iterate')
 import DearImGui
 import DearImGui.OpenGL2
 import qualified DearImGui.Plot as ImPlot
 import DearImGui.SDL
 import DearImGui.SDL.OpenGL
+import GHC.Float (int2Float)
+import GHC.Int (Int16)
 import Graphics.GL
+import Pipes
+import Pipes.PulseSimple
+import Pipes.Safe (runSafeT)
 import SDL
 
 main :: IO ()
@@ -42,21 +52,43 @@ main = do
     -- Initialize ImGui's OpenGL backend
     _ <- managed_ $ bracket_ openGL2Init openGL2Shutdown
 
-    liftIO $ mainLoop win
+    liftIO $ runSafeT (runEffect (readPulse "dear-pulse" Nothing 25 >-> mainLoop win))
 
-mainLoop :: Window -> IO ()
+-- | Binary decoder
+decodeSampleList :: BS.ByteString -> [Int16]
+decodeSampleList = runGet get . fromStrict
+  where
+    get = do
+      empty <- isEmpty
+      if empty
+        then return []
+        else do
+          sample <- getInt16le
+          rest <- get
+          return (sample : rest)
+
+mainLoop :: MonadIO m => Window -> Consumer' BS.ByteString m ()
 mainLoop win = do
   -- Process the event loop
   untilNothingM pollEventWithImGui
 
+  -- Get audio buffer
+  buf <- await
+  let maxInt16 :: Int16
+      maxInt16 = maxBound
+      maxInt16f = int2Float $ fromIntegral maxInt16
+      samples :: [Float]
+      samples = map (\x' -> int2Float (fromIntegral x') / maxInt16f) $ decodeSampleList buf
+
   -- Tell ImGui we're starting a new frame
   openGL2NewFrame
   sdl2NewFrame win
   newFrame
 
   -- Build the GUI
-  bracket_ (ImPlot.beginPlot "Hello, ImPlot!") ImPlot.endPlot do
+  ImPlot.setNextPlotLimits (0, 1) (-1, 1)
-    ImPlot.plotLine "test" [0.0, 0.1, 0.2, 0.3, 0.4] [0.1, 0.2, 0.3, 0.1, 0.5]
+  liftIO $ bracket_ (ImPlot.beginPlot "Audio") ImPlot.endPlot do
+    ImPlot.plotLine "pulse-input" xs samples
 
   -- Render
   glClear GL_COLOR_BUFFER_BIT
@@ -69,3 +101,8 @@ mainLoop win = do
   mainLoop win
   where
     untilNothingM m = m >>= maybe (return ()) (\_ -> untilNothingM m)
+    xs = range
+    range :: [Float]
+    range = take 1764 $ iterate' (+ step) 0.0
+    step :: Float
+    step = 1 / 1764

README.md

@@ -1,2 +1,24 @@
 # implot binding
 
+This project contains Haskell bindings to the
+[dear-imgui](https://github.com/ocornut/imgui)
+[implot](https://github.com/epezent/implot) project.
+
+The [demo](./Main.hs) shows a LinePlot of a pulseaudio input:
+
+![](./demo.png)
+
+## Contribute
+
+To build the project and the demo, make sure these projects are cloned:
+
+- ./github.com/haskell-game/dear-imgui.hs/
+- ./github.com/TristanCacqueray/pipes-pulse-simple/
+- ./github.com/TristanCacqueray/dear-implot.hs/
+
+Then run:
+
+```ShellSession
+$ cabal build
+$ cabal run test
+```

cabal.project

@@ -1,2 +1,2 @@
-packages: . ../../haskell-game/dear-imgui.hs/
+packages: . ../../haskell-game/dear-imgui.hs/ ../pipes-pulse-simple/
 flags: +sdl +opengl2 -vulkan

dear-implot.cabal

@@ -22,17 +22,26 @@ library
   include-dirs:
     implot
     imgui
-  build-depends:
+  build-depends: base
-      base
+               , StateVar
                , containers
-    , managed
+               , dear-imgui
                , inline-c
                , inline-c-cpp
-    , StateVar
+               , managed
-    , dear-imgui
 
 executable test
   main-is: Main.hs
   default-language: Haskell2010
-  build-depends: base, sdl2, gl, dear-imgui, dear-implot, managed
+  build-depends: base
+               , binary
+               , bytestring
+               , dear-imgui
+               , dear-implot
+               , gl
+               , managed
+               , pipes
+               , pipes-safe
+               , sdl2
+               , pipes-pulse-simple
   ghc-options: -Wall