mirror of
https://github.com/Drezil/dear-imgui.hs.git
synced 2024-11-23 01:07:00 +00:00
82 lines
1.9 KiB
Haskell
82 lines
1.9 KiB
Haskell
{-# language BlockArguments #-}
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{-# language LambdaCase #-}
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{-# language OverloadedStrings #-}
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module Main ( main ) where
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import Control.Exception
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import Control.Monad
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import Control.Monad.IO.Class
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import Control.Monad.Managed
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import DearImGui
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import DearImGui.OpenGL
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import DearImGui.GLFW
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import DearImGui.GLFW.OpenGL
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import Graphics.GL
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import Graphics.UI.GLFW (Window)
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import qualified Graphics.UI.GLFW as GLFW
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main :: IO ()
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main = do
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initialised <- GLFW.init
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unless initialised $ error "GLFW init failed"
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runManaged $ do
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mwin <- managed $ bracket
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(GLFW.createWindow 800 600 "Hello, Dear ImGui!" Nothing Nothing)
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(maybe (return ()) GLFW.destroyWindow)
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case mwin of
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Just win -> do
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liftIO $ do
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GLFW.makeContextCurrent (Just win)
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GLFW.swapInterval 1
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-- Create an ImGui context
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_ <- managed $ bracket createContext destroyContext
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-- Initialize ImGui's GLFW backend
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_ <- managed_ $ bracket_ (glfwInitForOpenGL win True) glfwShutdown
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-- Initialize ImGui's OpenGL backend
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_ <- managed_ $ bracket_ openGL2Init openGL2Shutdown
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liftIO $ mainLoop win
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Nothing -> do
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error "GLFW createWindow failed"
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GLFW.terminate
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mainLoop :: Window -> IO ()
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mainLoop win = do
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-- Process the event loop
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GLFW.pollEvents
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close <- GLFW.windowShouldClose win
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unless close do
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-- Tell ImGui we're starting a new frame
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openGL2NewFrame
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glfwNewFrame
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newFrame
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-- Build the GUI
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bracket_ (begin "Hello, ImGui!") end do
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-- Add a text widget
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text "Hello, ImGui!"
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-- Add a button widget, and call 'putStrLn' when it's clicked
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button "Clickety Click" >>= \case
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False -> return ()
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True -> putStrLn "Ow!"
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-- Show the ImGui demo window
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showDemoWindow
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-- Render
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glClear GL_COLOR_BUFFER_BIT
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render
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openGL2RenderDrawData =<< getDrawData
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GLFW.swapBuffers win
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mainLoop win |