Drezil/dear-imgui.hs
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Update README (#194)

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66
README.md
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@ -31,29 +31,30 @@ package dear-imgui
With this done, the following module is the "Hello, World!" of ImGui:
``` haskell
{-# language BlockArguments #-}
{-# language LambdaCase #-}
{-# language OverloadedStrings #-}
module Main ( main ) where
import Control.Exception
import Control.Monad.IO.Class
import Control.Monad.Managed
import DearImGui
import DearImGui.OpenGL2
import DearImGui.OpenGL3
import DearImGui.SDL
import DearImGui.SDL.OpenGL
import Graphics.GL
import SDL
import Control.Monad.Managed
import Control.Monad.IO.Class ()
import Control.Monad (when, unless)
import Control.Exception (bracket, bracket_)
main :: IO ()
main = do
-- Initialize SDL
initializeAll
runManaged do
-- Create a window using SDL. As we're using OpenGL, we need to enable OpenGL too.
runManaged $ do
-- Create a window using SDL; as we're using OpenGL, we enable OpenGL too
window <- do
let title = "Hello, Dear ImGui!"
let config = defaultWindow { windowGraphicsContext = OpenGLContext defaultOpenGL }
@ -61,64 +62,59 @@ main = do
-- Create an OpenGL context
glContext <- managed $ bracket (glCreateContext window) glDeleteContext
-- Create an ImGui context
_ <- managed $ bracket createContext destroyContext
-- Initialize ImGui's SDL2 backend
_ <- managed_ $ bracket_ (sdl2InitForOpenGL window glContext) sdl2Shutdown
managed_ $ bracket_ (sdl2InitForOpenGL window glContext) sdl2Shutdown
-- Initialize ImGui's OpenGL backend
_ <- managed_ $ bracket_ openGL2Init openGL2Shutdown
managed_ $ bracket_ openGL3Init openGL3Shutdown
liftIO $ mainLoop window
mainLoop :: Window -> IO ()
mainLoop window = unlessQuit do
mainLoop window = unlessQuit $ do
-- Tell ImGui we're starting a new frame
openGL2NewFrame
openGL3NewFrame
sdl2NewFrame
newFrame
-- Build the GUI
withWindowOpen "Hello, ImGui!" do
withWindowOpen "Hello, ImGui!" $ do
-- Add a text widget
text "Hello, ImGui!"
-- Add a button widget, and call 'putStrLn' when it's clicked
button "Clickety Click" >>= \case
False -> return ()
True -> putStrLn "Ow!"
button "Clickety Click" >>= \clicked ->
when clicked $ putStrLn "Ow!"
-- Show the ImGui demo window
showDemoWindow
-- Render
glClear GL_COLOR_BUFFER_BIT
render
openGL2RenderDrawData =<< getDrawData
openGL3RenderDrawData =<< getDrawData
glSwapWindow window
mainLoop window
where
-- Process the event loop
unlessQuit action = do
shouldQuit <- checkEvents
if shouldQuit then pure () else action
-- Process the event loop
unlessQuit action = do
shouldQuit <- gotQuitEvent
unless shouldQuit action
checkEvents = do
pollEventWithImGui >>= \case
Nothing ->
return False
Just event ->
(isQuit event ||) <$> checkEvents
gotQuitEvent = do
ev <- pollEventWithImGui
isQuit event =
SDL.eventPayload event == SDL.QuitEvent
case ev of
Nothing ->
return False
Just event ->
(isQuit event ||) <$> gotQuitEvent
isQuit event =
eventPayload event == QuitEvent
```
# Hacking

66
examples/Readme.hs
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@ -1,29 +1,30 @@
-- NOTE: If this is file is edited, please also copy and paste it into
-- README.md.
{-# language BlockArguments #-}
{-# language LambdaCase #-}
{-# language OverloadedStrings #-}
module Main ( main ) where
import Control.Exception
import Control.Monad.IO.Class
import Control.Monad.Managed
import DearImGui
import DearImGui.OpenGL2
import DearImGui.OpenGL3
import DearImGui.SDL
import DearImGui.SDL.OpenGL
import Graphics.GL
import SDL
import Control.Monad.Managed
import Control.Monad.IO.Class ()
import Control.Monad (when, unless)
import Control.Exception (bracket, bracket_)
main :: IO ()
main = do
-- Initialize SDL
initializeAll
runManaged do
-- Create a window using SDL. As we're using OpenGL, we need to enable OpenGL too.
runManaged $ do
-- Create a window using SDL; as we're using OpenGL, we enable OpenGL too
window <- do
let title = "Hello, Dear ImGui!"
let config = defaultWindow { windowGraphicsContext = OpenGLContext defaultOpenGL }
@ -31,61 +32,56 @@ main = do
-- Create an OpenGL context
glContext <- managed $ bracket (glCreateContext window) glDeleteContext
-- Create an ImGui context
_ <- managed $ bracket createContext destroyContext
-- Initialize ImGui's SDL2 backend
_ <- managed_ $ bracket_ (sdl2InitForOpenGL window glContext) sdl2Shutdown
managed_ $ bracket_ (sdl2InitForOpenGL window glContext) sdl2Shutdown
-- Initialize ImGui's OpenGL backend
_ <- managed_ $ bracket_ openGL2Init openGL2Shutdown
managed_ $ bracket_ openGL3Init openGL3Shutdown
liftIO $ mainLoop window
mainLoop :: Window -> IO ()
mainLoop window = unlessQuit do
mainLoop window = unlessQuit $ do
-- Tell ImGui we're starting a new frame
openGL2NewFrame
openGL3NewFrame
sdl2NewFrame
newFrame
-- Build the GUI
withWindowOpen "Hello, ImGui!" do
withWindowOpen "Hello, ImGui!" $ do
-- Add a text widget
text "Hello, ImGui!"
-- Add a button widget, and call 'putStrLn' when it's clicked
button "Clickety Click" >>= \case
False -> return ()
True -> putStrLn "Ow!"
button "Clickety Click" >>= \clicked ->
when clicked $ putStrLn "Ow!"
-- Show the ImGui demo window
showDemoWindow
-- Render
glClear GL_COLOR_BUFFER_BIT
render
openGL2RenderDrawData =<< getDrawData
openGL3RenderDrawData =<< getDrawData
glSwapWindow window
mainLoop window
where
-- Process the event loop
unlessQuit action = do
shouldQuit <- checkEvents
if shouldQuit then pure () else action
-- Process the event loop
unlessQuit action = do
shouldQuit <- gotQuitEvent
unless shouldQuit action
checkEvents = do
pollEventWithImGui >>= \case
Nothing ->
return False
Just event ->
(isQuit event ||) <$> checkEvents
gotQuitEvent = do
ev <- pollEventWithImGui
isQuit event =
SDL.eventPayload event == SDL.QuitEvent
case ev of
Nothing ->
return False
Just event ->
(isQuit event ||) <$> gotQuitEvent
isQuit event =
eventPayload event == QuitEvent