Upgrade imgui to v1.89.7

Co-authored-by: Alexander Bondarenko <486682+dpwiz@users.noreply.github.com>

.github/workflows/build.yaml

@@ -4,16 +4,16 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2.3.4
+    - uses: actions/checkout@v2.4.0
       with:
           persist-credentials: false
           submodules: true
 
-    - uses: cachix/install-nix-action@v16
+    - uses: cachix/install-nix-action@v20
       with:
         nix_path: nixpkgs=channel:nixos-unstable
 
-    - uses: cachix/cachix-action@v10
+    - uses: cachix/cachix-action@v12
       with:
         name: hs-dear-imgui
         authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'

ChangeLog.md

@@ -1,5 +1,38 @@
 # Changelog for dear-imgui
 
+## [2.1.3]
+
+- Fixed off-by-1 in internal Text wrapper.
+- Fixed sliderFloat* Raw calls
+- Added `formatPtr` to Raw.dragFloat* and Raw.sliderFloat*
+
+## [2.1.2]
+
+- Fixed glfw example build flags.
+- Added `plotLines`.
+- Added `setNextItemOpen`.
+
+## [2.1.1]
+
+- Build flag fix for MacOS.
+
+## [2.1.0]
+
+- `imgui` updated to [1.88].
+    * Breaking: `ImGuiKeyModFlags` renamed to `ImGuiModFlags`.
+
+## [2.0.0]
+
+- `String` arguments replaced with `Text`.
+  * Upgrading to `text-2` recommended to reap the UTF-8 benefits.
+
+## [1.5.0]
+
+- Added table wrappers.
+- Added popup wrappers.
+- Added `selectableWith`/`SelectableOptions` to expose optional arguments.
+- Fix GHC-9.2 compatibility.
+
 ## [1.4.0]
 
 - `imgui` updated to [1.87].
@@ -68,6 +101,12 @@ Initial Hackage release based on [1.83].
 [1.3.0]: https://github.com/haskell-game/dear-imgui.hs/tree/v1.3.0
 [1.3.1]: https://github.com/haskell-game/dear-imgui.hs/tree/v1.3.1
 [1.4.0]: https://github.com/haskell-game/dear-imgui.hs/tree/v1.4.0
+[1.5.0]: https://github.com/haskell-game/dear-imgui.hs/tree/v1.5.0
+[2.0.0]: https://github.com/haskell-game/dear-imgui.hs/tree/v2.0.0
+[2.1.0]: https://github.com/haskell-game/dear-imgui.hs/tree/v2.1.0
+[2.1.1]: https://github.com/haskell-game/dear-imgui.hs/tree/v2.1.1
+[2.1.2]: https://github.com/haskell-game/dear-imgui.hs/tree/v2.1.2
+[2.1.3]: https://github.com/haskell-game/dear-imgui.hs/tree/v2.1.3
 
 [1.87]: https://github.com/ocornut/imgui/releases/tag/v1.87
 [1.86]: https://github.com/ocornut/imgui/releases/tag/v1.86

Main.hs

@@ -10,6 +10,7 @@ import Data.IORef
 import qualified Data.Vector as Vector
 import DearImGui
 import DearImGui.OpenGL3
+import DearImGui.Internal.Text (pack)
 import DearImGui.SDL
 import DearImGui.SDL.OpenGL
 import Control.Exception
@@ -134,18 +135,18 @@ loop window checked color slider r pos size' selected tab1Ref tab2Ref = do
 
   text "ListClipper"
   withChildOpen "##fixed" (ImVec2 0 200) True ImGuiWindowFlags_None do
-    let lotsOfItems = Vector.generate 50 (mappend "Item " . show)
+    let lotsOfItems = Vector.generate 50 (pack . mappend "Item " . show)
     withListClipper Nothing lotsOfItems text
 
   text "ListClipper, Haskell-powered"
   withChildOpen "##infinite" (ImVec2 0 200) True ImGuiWindowFlags_None do
-    let infiniteItems = map (mappend "Item " . show) [0 :: Int ..]
+    let infiniteItems = map (pack . mappend "Item " . show) [0 :: Int ..]
     withListClipper Nothing infiniteItems text
 
   text "Ethereal ListClipper"
   withChildOpen "##ethereal" (ImVec2 0 200) True ImGuiWindowFlags_None do
     withListClipper Nothing (ClipRange (0 :: Int) 1000) $
-      text . mappend "Item " . show
+      text . pack . mappend "Item " . show
 
   plotHistogram "A histogram" [ 10, 10, 20, 30, 90 ]
 

cabal.project

@@ -1,4 +1,4 @@
 packages: *.cabal
 package dear-imgui
-  flags: +sdl2 +glfw +opengl2 +opengl3 +vulkan +examples
+  flags: +sdl +glfw +opengl2 +opengl3 +vulkan +examples
   ghc-options: -Wall -Wcompat -fno-warn-unused-do-bind

dear-imgui.cabal

@@ -1,7 +1,7 @@
 cabal-version: 3.0
 
 name: dear-imgui
-version: 1.4.0
+version: 2.1.3
 author: Oliver Charles
 maintainer: ollie@ocharles.org.uk, aenor.realm@gmail.com
 license: BSD-3-Clause
@@ -126,10 +126,21 @@ flag use-wchar32
   manual:
     True
 
+flag use-ImDrawIdx32
+  description:
+    Use 32-bit vertex indices (default is 16-bit) is one way to allow large meshes with more than 64K vertices.
+    Your renderer backend will need to support it (most example renderer backends support both 16/32-bit indices).
+    Another way to allow large meshes while keeping 16-bit indices is to handle ImDrawCmd::VtxOffset in your renderer.
+    Read about ImGuiBackendFlags_RendererHasVtxOffset for details.
+  default:
+    True
+  manual:
+    True
+
 common common
   build-depends:
       base
-        >= 4.12 && < 4.17
+        >= 4.12 && < 4.19
   default-language:
       Haskell2010
 
@@ -140,15 +151,16 @@ library
   exposed-modules:
     DearImGui
     DearImGui.FontAtlas
+    DearImGui.Internal.Text
     DearImGui.Raw
     DearImGui.Raw.DrawList
     DearImGui.Raw.Font
     DearImGui.Raw.Font.Config
     DearImGui.Raw.Font.GlyphRanges
-    DearImGui.Raw.ListClipper
     DearImGui.Raw.IO
+    DearImGui.Raw.ListClipper
+    DearImGui.Raw.Context
   other-modules:
-    DearImGui.Context
     DearImGui.Enums
     DearImGui.Structs
   cxx-options: -std=c++11
@@ -171,6 +183,11 @@ library
     , StateVar
     , unliftio
     , vector
+    , text
+
+  if os(darwin)
+    ghc-options:
+      -optcxx-std=c++11
 
   if flag(disable-obsolete)
     cxx-options: -DIMGUI_DISABLE_OBSOLETE_FUNCTIONS
@@ -179,6 +196,10 @@ library
     cxx-options: -DIMGUI_USE_WCHAR32
     cpp-options: -DIMGUI_USE_WCHAR32
 
+  if flag(use-ImDrawIdx32)
+    cxx-options: "-DImDrawIdx=unsigned int"
+    cpp-options: "-DImDrawIdx=unsigned int"
+
   if flag(opengl2)
     exposed-modules:
       DearImGui.OpenGL2
@@ -222,7 +243,7 @@ library
     build-depends:
       sdl2
     cxx-sources:
-      imgui/backends/imgui_impl_sdl.cpp
+      imgui/backends/imgui_impl_sdl2.cpp
 
     if os(windows) || os(darwin)
       extra-libraries:
@@ -270,7 +291,7 @@ library dear-imgui-generator
     , DearImGui.Generator.Types
   build-depends:
       template-haskell
-        >= 2.15 && < 2.19
+        >= 2.15 && < 2.21
     , containers
        ^>= 0.6.2.1
     , directory
@@ -286,11 +307,11 @@ library dear-imgui-generator
     , scientific
         >= 0.3.6.2 && < 0.3.8
     , text
-        >= 1.2.4 && < 1.3
+        >= 1.2.4 && < 2.1
     , th-lift
         >= 0.7 && < 0.9
     , transformers
-        >= 0.5.6 && < 0.6
+        >= 0.5.6 && < 0.7
     , unordered-containers
         >= 0.2.11 && < 0.3
 
@@ -311,7 +332,7 @@ executable glfw
   if (!flag(examples) || !flag(glfw) || !flag(opengl2))
     buildable: False
   else
-    build-depends: base, GLFW-b, gl, dear-imgui, managed
+    build-depends: base, GLFW-b, gl, dear-imgui, managed, text
 
 executable readme
   import: common, exe-flags
@@ -334,7 +355,7 @@ executable image
   main-is: Image.hs
   hs-source-dirs: examples/sdl
   build-depends: sdl2, gl, dear-imgui, managed, vector
-  if (!flag(examples) || !flag(sdl) || !flag(opengl2))
+  if (!flag(examples) || !flag(sdl) || !flag(opengl3))
     buildable: False
 
 executable vulkan
@@ -361,7 +382,7 @@ executable vulkan
       , text-short
          ^>= 0.1.3
       , transformers
-         ^>= 0.5.6.2
+          >= 0.5.6 && < 0.7
       , unliftio
           >= 0.2.13 && < 0.2.19
       , unliftio-core
@@ -369,8 +390,9 @@ executable vulkan
       , vector
          ^>= 0.12.1.2
       , vulkan
-         ^>= 3.9
+         >= 3.12
       , vulkan-utils
-         ^>= 0.4.1
+         >= 0.5
       , VulkanMemoryAllocator
+         >= 0.7.1
       , JuicyPixels

examples/glfw/Main.hs

@@ -1,6 +1,7 @@
 {-# language BlockArguments #-}
 {-# language LambdaCase #-}
 {-# language OverloadedStrings #-}
+{-# language RecordWildCards #-}
 
 module Main ( main ) where
 
@@ -8,6 +9,12 @@ import Control.Exception
 import Control.Monad
 import Control.Monad.IO.Class
 import Control.Monad.Managed
+import Data.Bits ((.|.))
+import Data.IORef
+import Data.List (sortBy)
+import Data.Foldable (traverse_)
+import Data.Text (Text, pack)
+
 import DearImGui
 import DearImGui.OpenGL2
 import DearImGui.GLFW
@@ -40,14 +47,23 @@ main = do
         -- Initialize ImGui's OpenGL backend
         _ <- managed_ $ bracket_ openGL2Init openGL2Shutdown
 
-        liftIO $ mainLoop win
+        tableRef <- liftIO $ newIORef
+          [ (1,  "foo")
+          , (2,  "bar")
+          , (3,  "baz")
+          , (10, "spam")
+          , (11, "spam")
+          , (12, "spam")
+          ]
+
+        liftIO $ mainLoop win tableRef
       Nothing -> do
         error "GLFW createWindow failed"
 
   GLFW.terminate
 
-mainLoop :: Window -> IO ()
+mainLoop :: Window -> IORef [(Integer, Text)] -> IO ()
-mainLoop win = do
+mainLoop win tableRef = do
   -- Process the event loop
   GLFW.pollEvents
   close <- GLFW.windowShouldClose win
@@ -73,8 +89,9 @@ mainLoop win = do
           when clicked $
             closeCurrentPopup
 
-    -- Show the ImGui demo window
+      newLine
-    showDemoWindow
+
+      mkTable tableRef
 
     -- Render
     glClear GL_COLOR_BUFFER_BIT
@@ -84,4 +101,41 @@ mainLoop win = do
 
     GLFW.swapBuffers win
 
-    mainLoop win
+    mainLoop win tableRef
+
+mkTable :: IORef [(Integer, Text)] -> IO ()
+mkTable tableRef =
+  withTableOpen sortable "MyTable" 3 $ do
+    tableSetupColumn "Hello"
+    tableSetupColumnWith defTableColumnOptions "World"
+
+    withSortableTable \isDirty sortSpecs ->
+      when (isDirty && not (null sortSpecs)) do
+        -- XXX: do your sorting & cache it. Dont sort every frame.
+        putStrLn "So dirty!"
+        print sortSpecs
+        modifyIORef' tableRef . sortBy $
+          foldMap mkCompare sortSpecs
+
+    tableHeadersRow
+    readIORef tableRef >>=
+      traverse_ \(ix, title) -> do
+        tableNextRow
+        tableNextColumn $ text (pack $ show ix)
+        tableNextColumn $ text title
+        tableNextColumn $ void (button "♥")
+  where
+    mkCompare TableSortingSpecs{..} a b =
+      let
+        dir = if tableSortingReverse then flip else id
+      in
+        case tableSortingColumn of
+          0 -> dir compare (fst a) (fst b)
+          1 -> dir compare (snd a) (snd b)
+          _ -> EQ
+
+    sortable = defTableOptions
+      { tableFlags =
+          ImGuiTableFlags_Sortable .|.
+          ImGuiTableFlags_SortMulti
+      }

examples/vulkan/Backend.hs

@@ -374,10 +374,9 @@ chooseSwapchainFormat
 
       case sortOn ( Down . score ) ( Boxed.Vector.toList surfaceFormats ) of
         [] -> error "No formats found."
-        ( best : _ )
+        Vulkan.SurfaceFormatKHR{format=Vulkan.FORMAT_UNDEFINED} : _rest ->
-          | Vulkan.FORMAT_UNDEFINED <- ( Vulkan.format :: Vulkan.SurfaceFormatKHR -> Vulkan.Format ) best
+          pure preferredFormat
-            -> pure preferredFormat
+        best : _rest
-          | otherwise
           -> pure best
 
     where
@@ -415,11 +414,8 @@ createSwapchain physicalDevice device surface surfaceFormat imageUsage imageCoun
       | otherwise
       = Vulkan.PRESENT_MODE_FIFO_KHR
 
-    currentExtent :: Vulkan.Extent2D
+    Vulkan.SurfaceCapabilitiesKHR{currentExtent, currentTransform} = surfaceCapabilities
-    currentExtent = ( Vulkan.currentExtent :: Vulkan.SurfaceCapabilitiesKHR -> Vulkan.Extent2D ) surfaceCapabilities
+    Vulkan.SurfaceFormatKHR{format=fmt, colorSpace=csp} = surfaceFormat
-
-    currentTransform :: Vulkan.SurfaceTransformFlagBitsKHR
-    currentTransform = ( Vulkan.currentTransform :: Vulkan.SurfaceCapabilitiesKHR -> Vulkan.SurfaceTransformFlagBitsKHR ) surfaceCapabilities
 
     swapchainCreateInfo :: Vulkan.SwapchainCreateInfoKHR '[]
     swapchainCreateInfo =
@@ -428,8 +424,8 @@ createSwapchain physicalDevice device surface surfaceFormat imageUsage imageCoun
         , Vulkan.flags                 = Vulkan.zero
         , Vulkan.surface               = Vulkan.SurfaceKHR surface
         , Vulkan.minImageCount         = imageCount
-        , Vulkan.imageFormat           = ( Vulkan.format     :: Vulkan.SurfaceFormatKHR -> Vulkan.Format        ) surfaceFormat
+        , Vulkan.imageFormat           = fmt
-        , Vulkan.imageColorSpace       = ( Vulkan.colorSpace :: Vulkan.SurfaceFormatKHR -> Vulkan.ColorSpaceKHR ) surfaceFormat
+        , Vulkan.imageColorSpace       = csp
         , Vulkan.imageExtent           = currentExtent
         , Vulkan.imageArrayLayers      = 1
         , Vulkan.imageUsage            = imageUsage
@@ -591,7 +587,7 @@ createFramebuffer
   -> Vulkan.Extent2D
   -> f Vulkan.ImageView
   -> m ( ResourceT.ReleaseKey, Vulkan.Framebuffer )
-createFramebuffer dev renderPass extent attachments = Vulkan.withFramebuffer dev createInfo Nothing ResourceT.allocate
+createFramebuffer dev renderPass Vulkan.Extent2D{width, height} attachments = Vulkan.withFramebuffer dev createInfo Nothing ResourceT.allocate
   where
     createInfo :: Vulkan.FramebufferCreateInfo '[]
     createInfo =
@@ -600,8 +596,8 @@ createFramebuffer dev renderPass extent attachments = Vulkan.withFramebuffer dev
         , Vulkan.flags       = Vulkan.zero
         , Vulkan.renderPass  = renderPass
         , Vulkan.attachments = Boxed.Vector.fromList . toList $ attachments
-        , Vulkan.width       = ( Vulkan.width  :: Vulkan.Extent2D -> Word32 ) extent
+        , Vulkan.width       = width
-        , Vulkan.height      = ( Vulkan.height :: Vulkan.Extent2D -> Word32 ) extent
+        , Vulkan.height      = height
         , Vulkan.layers      = 1
         }
 

examples/vulkan/Main.hs

@@ -201,9 +201,7 @@ app = do
   surfaceCapabilities <- Vulkan.getPhysicalDeviceSurfaceCapabilitiesKHR physicalDevice ( Vulkan.SurfaceKHR surface )
 
   let
-    minImageCount, maxImageCount, imageCount :: Word32
+    Vulkan.SurfaceCapabilitiesKHR{minImageCount, maxImageCount} = surfaceCapabilities
-    minImageCount = ( Vulkan.minImageCount :: Vulkan.SurfaceCapabilitiesKHR -> Word32 ) surfaceCapabilities
-    maxImageCount = ( Vulkan.maxImageCount :: Vulkan.SurfaceCapabilitiesKHR -> Word32 ) surfaceCapabilities
     imageCount
       | maxImageCount == 0 =   minImageCount + 1
       | otherwise          = ( minImageCount + 1 ) `min` maxImageCount
@@ -213,31 +211,30 @@ app = do
 
     swapchainResources :: Maybe SwapchainResources -> m ( m (), SwapchainResources )
     swapchainResources mbOldResources = do
-      ( surfaceFormat, imGuiRenderPass ) <- case mbOldResources of
+      ( colFmt, surfaceFormat, imGuiRenderPass ) <- case mbOldResources of
         Nothing -> do
           logDebug "Choosing swapchain format & color space"
           surfaceFormat <- chooseSwapchainFormat preferredFormat physicalDevice surface
-          let
+          let Vulkan.SurfaceFormatKHR{format=colFmt} = surfaceFormat
-            colFmt :: Vulkan.Format
-            colFmt = ( Vulkan.format :: Vulkan.SurfaceFormatKHR -> Vulkan.Format ) surfaceFormat
           logDebug "Creating Dear ImGui render pass"
           ( _, imGuiRenderPass ) <-
             simpleRenderPass device
               ( noAttachments
                 { colorAttachments = Boxed.Vector.singleton $ presentableColorAttachmentDescription colFmt }
               )
-          pure ( surfaceFormat, imGuiRenderPass )
+          pure ( colFmt, surfaceFormat, imGuiRenderPass )
-        Just oldResources -> pure ( surfaceFormat oldResources, imGuiRenderPass oldResources )
+        Just oldResources -> do
-
+          let surFmt = surfaceFormat oldResources
-      let
+          let Vulkan.SurfaceFormatKHR{format=colFmt} = surFmt
-        colFmt :: Vulkan.Format
+          pure ( colFmt, surFmt, imGuiRenderPass oldResources )
-        colFmt = ( Vulkan.format :: Vulkan.SurfaceFormatKHR -> Vulkan.Format ) surfaceFormat
 
       logDebug "Creating swapchain"
       ( swapchainKey, swapchain, swapchainExtent ) <-
         createSwapchain
-          physicalDevice device
+          physicalDevice
-          surface surfaceFormat
+          device
+          surface
+          surfaceFormat
           surfaceUsage
           imageCount
           ( swapchain <$> mbOldResources )

generator/DearImGui/Generator.hs

@@ -24,6 +24,10 @@ import Data.Traversable
   ( for )
 import Foreign.Storable
   ( Storable )
+#if MIN_VERSION_template_haskell(2,18,0)
+import Data.Coerce
+  ( coerce )
+#endif
 
 -- containers
 import Data.Map.Strict
@@ -171,7 +175,7 @@ declareEnumeration finiteEnumName countName ( Enumeration {..} ) = do
         else
           \ nm args dir pat ->
           TH.patSynD_doc nm args dir pat
-            ( Just $ Text.unpack patDoc ) []
+            ( Just $ Text.unpack _patDoc ) []
       )
 #else
       TH.patSynD

generator/DearImGui/Generator/Parser.hs

@@ -60,7 +60,7 @@ import Data.Text
   ( Text )
 import qualified Data.Text as Text
   ( all, any, breakOn, drop, dropWhile, dropWhileEnd
-  , length, stripPrefix, unlines, unpack
+  , length, stripPrefix, unlines, unpack, pack
   )
 
 -- transformers
@@ -81,6 +81,8 @@ import DearImGui.Generator.Tokeniser
 import DearImGui.Generator.Types
   ( Comment(..), Enumeration(..), Headers(..) )
 
+import qualified Text.Show as Text
+
 --------------------------------------------------------------------------------
 -- Parse error type.
 
@@ -90,7 +92,9 @@ data CustomParseError
     , problems :: ![Text]
     }
   | MissingForwardDeclaration
-    { enumName :: !Text }
+    { enumName :: !Text
+    , library :: HashMap Text ( TH.Name, Comment )
+    }
   | UnexpectedSection
     { sectionName :: !Text
     , problem     :: ![Text]
@@ -101,8 +105,9 @@ instance ShowErrorComponent CustomParseError where
   showErrorComponent ( Couldn'tLookupEnumValues { enumName, problems } ) = Text.unpack $
     "Couldn't lookup the following values in enum " <> enumName <> ":\n"
     <> Text.unlines ( map ( " - "  <> ) problems )
-  showErrorComponent ( MissingForwardDeclaration { enumName } ) = Text.unpack $
+  showErrorComponent ( MissingForwardDeclaration { enumName, library } ) = Text.unpack $
-    "Missing forward declaration for enum named " <> enumName
+    "Missing forward declaration for enum named " <> enumName <> "\n"
+    <> "In Library: " <> Text.pack ( Text.show library)
   showErrorComponent ( UnexpectedSection { sectionName, problem } ) = Text.unpack $
     "Unexpected section name.\n\
     \Expected: " <> sectionName <> "\n\
@@ -124,6 +129,7 @@ headers = do
   ( _defines, basicEnums ) <- partitionEithers <$>
     manyTill
       (   ( Left  <$> try ignoreDefine )
+      <|> ( Left  <$> try cppConditional )
       <|> ( Right <$> enumeration enumNamesAndTypes )
       )
       ( namedSection "Helpers: Memory allocations macros, ImVector<>" )
@@ -134,7 +140,7 @@ headers = do
 
   _ <- skipManyTill anySingle ( namedSection "Misc data structures" )
 
-  _ <- skipManyTill anySingle ( namedSection "Helpers (ImGuiOnceUponAFrame, ImGuiTextFilter, ImGuiTextBuffer, ImGuiStorage, ImGuiListClipper, ImColor)" )
+  _ <- skipManyTill anySingle ( namedSection "Helpers (ImGuiOnceUponAFrame, ImGuiTextFilter, ImGuiTextBuffer, ImGuiStorage, ImGuiListClipper, Math Operators, ImColor)" )
 
   _ <- skipManyTill anySingle ( namedSection "Drawing API (ImDrawCmd, ImDrawIdx, ImDrawVert, ImDrawChannel, ImDrawListSplitter, ImDrawListFlags, ImDrawList, ImDrawData)" )
   skipManyTill anySingle ( try . lookAhead $ many comment *> keyword "enum" )
@@ -171,14 +177,24 @@ forwardDeclarations = do
     pure ( structName, doc )
   _ <- many comment
   enums <- many do
+    keyword "enum"
+    enumName <- identifier
+    symbol ":"
+    ty <- cTypeName
+    reservedSymbol ';'
+    doc <- commentText <$> comment
+    pure ( enumName, ( ty, CommentText <$> Text.drop 2 . snd $ Text.breakOn "//" doc ) )
+  _ <- many comment
+  typedefs <- many do
     keyword "typedef"
     ty <- cTypeName
     enumName <- identifier
     reservedSymbol ';'
     doc <- commentText <$> comment
+    _ <- many comment
     pure ( enumName, ( ty, CommentText <$> Text.drop 2 . snd $ Text.breakOn "//" doc ) )
   -- Stopping after simple structs and enums for now.
-  pure ( HashMap.fromList structs, HashMap.fromList enums )
+  pure ( HashMap.fromList structs, HashMap.fromList (enums <> typedefs) )
 
 cTypeName :: MonadParsec e [Tok] m => m TH.Name
 cTypeName = keyword "int" $> ''CInt
@@ -200,6 +216,7 @@ enumeration enumNamesAndTypes = do
     keyword "enum"
     pure inlineDocs
   fullEnumName <- identifier
+  _ <- try $ (symbol ":" >> cTypeName >> pure ()) <|> pure ()
   let
     enumName :: Text
     enumName = Text.dropWhileEnd ( == '_' ) fullEnumName
@@ -207,7 +224,7 @@ enumeration enumNamesAndTypes = do
     enumTypeName = ()
   ( underlyingType, forwardDoc ) <- case HashMap.lookup enumName enumNamesAndTypes of
     Just res -> pure res
-    Nothing  -> customFailure ( MissingForwardDeclaration { enumName } )
+    Nothing  -> customFailure ( MissingForwardDeclaration { enumName, library=enumNamesAndTypes } )
   let
     docs :: [Comment]
     docs = forwardDoc : CommentText "" : inlineDocs

src/DearImGui/FontAtlas.hs

@@ -119,6 +119,8 @@ import DearImGui.Raw.Font.Config (FontConfig(..))
 import qualified DearImGui.Raw.Font.Config as FontConfig
 import DearImGui.Raw.Font.GlyphRanges (GlyphRanges(..), GlyphRangesBuilder(..))
 import qualified DearImGui.Raw.Font.GlyphRanges as GlyphRanges
+import DearImGui.Internal.Text (Text)
+import qualified DearImGui.Internal.Text as Text
 
 import DearImGui.Structs (ImVec2(..), ImWchar)
 
@@ -332,10 +334,10 @@ addChar char =
     GlyphRanges.addChar builder char
 
 -- | UTF-8 string
-addText :: String -> RangesBuilderSetup
+addText :: Text -> RangesBuilderSetup
 addText str =
   RangesBuilderSetup \builder ->
-    withCString str (GlyphRanges.addText builder)
+    Text.withCString str (GlyphRanges.addText builder)
 
 -- | Existing ranges (as is)
 addRangesRaw :: GlyphRanges -> RangesBuilderSetup

src/DearImGui/Internal/Text.hs

@@ -0,0 +1,76 @@
+{-# LANGUAGE CPP #-}
+
+module DearImGui.Internal.Text
+  ( withCString
+  , withCStringOrNull
+  , withCStringLen
+  , withCStringEnd
+  , peekCString
+
+  , Text
+  , pack
+  , unpack
+  ) where
+
+-- base
+import Foreign (nullPtr, plusPtr)
+import Foreign.C.String (CString)
+import qualified GHC.Foreign as Foreign
+import System.IO (utf8)
+
+-- text
+import Data.Text (Text, pack, unpack)
+import Data.Text.Foreign (withCStringLen)
+
+-- unliftio-core
+import UnliftIO (MonadUnliftIO, UnliftIO(..), withUnliftIO)
+
+#if MIN_VERSION_text(2,0,1)
+-- XXX: just wrap the provided combinator
+
+import qualified Data.Text.Foreign as Text
+
+withCString :: MonadUnliftIO m => Text -> (CString -> m a) -> m a
+withCString text action =
+  withUnliftIO $ \(UnliftIO unlift) ->
+    Text.withCString text $ \buf ->
+      unlift $ action buf
+
+#elif MIN_VERSION_text(2,0,0)
+-- XXX: the text is UTF-8, alas no withCString is available
+
+import Data.Text.Foreign (lengthWord8, unsafeCopyToPtr)
+import Data.Word (Word8)
+import Foreign (allocaBytes, castPtr, pokeByteOff)
+
+withCString :: MonadUnliftIO m => Text -> (CString -> m a) -> m a
+withCString t@(Text _arr _off len) action =
+  withUnliftIO $ \(UnliftIO unlift) ->
+    allocaBytes (len + 1) $ \buf -> do
+      unsafeCopyToPtr t buf
+      pokeByteOff buf len (0 :: Word8)
+      unlift $ action (castPtr buf)
+
+#else
+-- XXX: the text is UTF-16, let GHC do it
+
+withCString :: MonadUnliftIO m => Text -> (CString -> m a) -> m a
+withCString t action = do
+  withUnliftIO $ \(UnliftIO unlift) ->
+    Foreign.withCString utf8 (unpack t) $ \textPtr ->
+      unlift $ action textPtr
+
+#endif
+
+peekCString :: CString -> IO Text
+peekCString = fmap pack . Foreign.peekCString utf8
+
+withCStringOrNull :: Maybe Text -> (CString -> IO a) -> IO a
+withCStringOrNull Nothing k  = k nullPtr
+withCStringOrNull (Just s) k = withCString s k
+
+withCStringEnd :: MonadUnliftIO m => Text -> (CString -> CString -> m a) -> m a
+withCStringEnd t action =
+  withUnliftIO $ \(UnliftIO unlift) ->
+    withCStringLen t $ \(textPtr, size) ->
+      unlift $ action textPtr (textPtr `plusPtr` size)

src/DearImGui/Raw.hs

@@ -6,6 +6,7 @@
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE PatternSynonyms #-}
 {-# LANGUAGE QuasiQuotes #-}
+{-# LANGUAGE RecordWildCards #-}
 {-# LANGUAGE TemplateHaskell #-}
 {-# LANGUAGE ViewPatterns #-}
 
@@ -89,6 +90,7 @@ module DearImGui.Raw
   , popItemWidth
   , beginGroup
   , endGroup
+  , getCursorPos
   , setCursorPos
   , getCursorScreenPos
   , alignTextToFramePadding
@@ -170,6 +172,7 @@ module DearImGui.Raw
   , tableHeader
 
   , tableGetSortSpecs
+  , tableClearSortSpecsDirty
 
   , tableGetColumnCount
   , tableGetColumnIndex
@@ -183,6 +186,7 @@ module DearImGui.Raw
   , treeNode
   , treePush
   , treePop
+  , setNextItemOpen
 
     -- ** Selectables
   , selectable
@@ -191,6 +195,7 @@ module DearImGui.Raw
   , listBox
 
     -- * Data Plotting
+  , plotLines
   , plotHistogram
 
     -- ** Menus
@@ -260,7 +265,7 @@ import System.IO.Unsafe
   ( unsafePerformIO )
 
 -- dear-imgui
-import DearImGui.Context
+import DearImGui.Raw.Context
   ( imguiContext )
 import DearImGui.Enums
 import DearImGui.Structs
@@ -689,27 +694,27 @@ combo labelPtr iPtr itemsPtr itemsLen = liftIO do
 
 
 -- | Wraps @ImGui::DragFloat()@
-dragFloat :: (MonadIO m) => CString -> Ptr CFloat -> CFloat -> CFloat -> CFloat -> m Bool
+dragFloat :: (MonadIO m) => CString -> Ptr CFloat -> CFloat -> CFloat -> CFloat -> CString -> m Bool
-dragFloat descPtr floatPtr speed minValue maxValue = liftIO do
+dragFloat descPtr floatPtr speed minValue maxValue formatPtr = liftIO do
-  (0 /=) <$> [C.exp| bool { DragFloat( $(char* descPtr), $(float* floatPtr), $(float speed), $(float minValue), $(float maxValue)) } |]
+  (0 /=) <$> [C.exp| bool { DragFloat( $(char* descPtr), $(float* floatPtr), $(float speed), $(float minValue), $(float maxValue), $(char* formatPtr)) } |]
 
 
 -- | Wraps @ImGui::DragFloat2()@
-dragFloat2 :: (MonadIO m) => CString -> Ptr CFloat -> CFloat -> CFloat -> CFloat -> m Bool
+dragFloat2 :: (MonadIO m) => CString -> Ptr CFloat -> CFloat -> CFloat -> CFloat -> CString -> m Bool
-dragFloat2 descPtr floatPtr speed minValue maxValue = liftIO do
+dragFloat2 descPtr floatPtr speed minValue maxValue formatPtr = liftIO do
-  (0 /=) <$> [C.exp| bool { DragFloat2( $(char* descPtr), $(float* floatPtr), $(float speed), $(float minValue), $(float maxValue)) } |]
+  (0 /=) <$> [C.exp| bool { DragFloat2( $(char* descPtr), $(float* floatPtr), $(float speed), $(float minValue), $(float maxValue), $(char* formatPtr)) } |]
 
 
 -- | Wraps @ImGui::DragFloat3()@
-dragFloat3 :: (MonadIO m) => CString -> Ptr CFloat -> CFloat -> CFloat -> CFloat -> m Bool
+dragFloat3 :: (MonadIO m) => CString -> Ptr CFloat -> CFloat -> CFloat -> CFloat -> CString -> m Bool
-dragFloat3 descPtr floatPtr speed minValue maxValue = liftIO do
+dragFloat3 descPtr floatPtr speed minValue maxValue formatPtr = liftIO do
-  (0 /=) <$> [C.exp| bool { DragFloat3( $(char* descPtr), $(float* floatPtr), $(float speed), $(float minValue), $(float maxValue)) } |]
+  (0 /=) <$> [C.exp| bool { DragFloat3( $(char* descPtr), $(float* floatPtr), $(float speed), $(float minValue), $(float maxValue), $(char* formatPtr)) } |]
 
 
 -- | Wraps @ImGui::DragFloat4()@
-dragFloat4 :: (MonadIO m) => CString -> Ptr CFloat -> CFloat -> CFloat -> CFloat -> m Bool
+dragFloat4 :: (MonadIO m) => CString -> Ptr CFloat -> CFloat -> CFloat -> CFloat -> CString -> m Bool
-dragFloat4 descPtr floatPtr speed minValue maxValue = liftIO do
+dragFloat4 descPtr floatPtr speed minValue maxValue formatPtr = liftIO do
-  (0 /=) <$> [C.exp| bool { DragFloat4( $(char* descPtr), $(float* floatPtr), $(float speed), $(float minValue), $(float maxValue)) } |]
+  (0 /=) <$> [C.exp| bool { DragFloat4( $(char* descPtr), $(float* floatPtr), $(float speed), $(float minValue), $(float maxValue), $(char* formatPtr)) } |]
 
 
 -- | Wraps @ImGui::DragFloatRange2()@
@@ -849,27 +854,27 @@ dragScalarN labelPtr dataType dataPtr components vSpeed minPtr maxPtr formatPtr
     maxPtr_ = castPtr maxPtr
 
 -- | Wraps @ImGui::SliderFloat()@
-sliderFloat :: (MonadIO m) => CString -> Ptr CFloat -> CFloat -> CFloat -> m Bool
+sliderFloat :: (MonadIO m) => CString -> Ptr CFloat -> CFloat -> CFloat -> CString -> m Bool
-sliderFloat descPtr floatPtr minValue maxValue = liftIO do
+sliderFloat descPtr floatPtr minValue maxValue formatPtr = liftIO do
-  (0 /=) <$> [C.exp| bool { SliderFloat( $(char* descPtr), $(float* floatPtr), $(float minValue), $(float maxValue)) } |]
+  (0 /=) <$> [C.exp| bool { SliderFloat( $(char* descPtr), $(float* floatPtr), $(float minValue), $(float maxValue), $(char* formatPtr)) } |]
 
 
 -- | Wraps @ImGui::SliderFloat2()@
-sliderFloat2 :: (MonadIO m) => CString -> Ptr CFloat -> CFloat -> CFloat -> m Bool
+sliderFloat2 :: (MonadIO m) => CString -> Ptr CFloat -> CFloat -> CFloat -> CString -> m Bool
-sliderFloat2 descPtr floatPtr minValue maxValue = liftIO do
+sliderFloat2 descPtr floatPtr minValue maxValue formatPtr = liftIO do
-  (0 /=) <$> [C.exp| bool { SliderFloat2( $(char* descPtr), $(float* floatPtr), $(float minValue), $(float maxValue)) } |]
+  (0 /=) <$> [C.exp| bool { SliderFloat2( $(char* descPtr), $(float* floatPtr), $(float minValue), $(float maxValue), $(char* formatPtr)) } |]
 
 
 -- | Wraps @ImGui::SliderFloat3()@
-sliderFloat3 :: (MonadIO m) => CString -> Ptr CFloat -> CFloat -> CFloat -> m Bool
+sliderFloat3 :: (MonadIO m) => CString -> Ptr CFloat -> CFloat -> CFloat -> CString -> m Bool
-sliderFloat3 descPtr floatPtr minValue maxValue = liftIO do
+sliderFloat3 descPtr floatPtr minValue maxValue formatPtr = liftIO do
-  (0 /=) <$> [C.exp| bool { SliderFloat3( $(char* descPtr), $(float* floatPtr), $(float minValue), $(float maxValue)) } |]
+  (0 /=) <$> [C.exp| bool { SliderFloat3( $(char* descPtr), $(float* floatPtr), $(float minValue), $(float maxValue), $(char* formatPtr)) } |]
 
 
 -- | Wraps @ImGui::SliderFloat4()@
-sliderFloat4 :: (MonadIO m) => CString -> Ptr CFloat -> CFloat -> CFloat -> m Bool
+sliderFloat4 :: (MonadIO m) => CString -> Ptr CFloat -> CFloat -> CFloat -> CString -> m Bool
-sliderFloat4 descPtr floatPtr minValue maxValue = liftIO do
+sliderFloat4 descPtr floatPtr minValue maxValue formatPtr = liftIO do
-  (0 /=) <$> [C.exp| bool { SliderFloat4( $(char* descPtr), $(float* floatPtr), $(float minValue), $(float maxValue)) } |]
+  (0 /=) <$> [C.exp| bool { SliderFloat4( $(char* descPtr), $(float* floatPtr), $(float minValue), $(float maxValue), $(char* formatPtr)) } |]
 
 -- | Wraps @ImGui::SliderAngle()@
 sliderAngle :: (MonadIO m) => CString -> Ptr CFloat -> CFloat -> CFloat -> CString -> ImGuiSliderFlags -> m Bool
@@ -1165,6 +1170,12 @@ tableGetSortSpecs = liftIO do
   else
     return $ Just ptr
 
+tableClearSortSpecsDirty :: MonadIO m => Ptr ImGuiTableSortSpecs -> m ()
+tableClearSortSpecsDirty specsPtr = liftIO do
+  [C.block| void {
+    $(ImGuiTableSortSpecs* specsPtr)->SpecsDirty = false;
+  } |]
+
 -- | Wraps @ImGui::TableGetColumnCount()@.
 tableGetColumnCount :: MonadIO m => m CInt
 tableGetColumnCount = liftIO do
@@ -1224,6 +1235,11 @@ treePop = liftIO do
   [C.exp| void { TreePop() } |]
 
 
+-- | Wraps @ImGui::SetNextItemOpen()@.
+setNextItemOpen :: (MonadIO m) => CBool -> m ()
+setNextItemOpen is_open = liftIO do
+  [C.exp| void { SetNextItemOpen($(bool is_open)) } |]
+
 -- -- | Wraps @ImGui::Selectable()@.
 -- selectable :: (MonadIO m) => CString -> m Bool
 -- selectable labelPtr = liftIO do
@@ -1242,6 +1258,10 @@ listBox :: (MonadIO m) => CString -> Ptr CInt -> Ptr CString -> CInt -> m Bool
 listBox labelPtr iPtr itemsPtr itemsLen = liftIO do
   (0 /=) <$> [C.exp| bool { ListBox($(char* labelPtr), $(int* iPtr), $(char** itemsPtr), $(int itemsLen)) }|]
 
+-- | Wraps @ImGui::PlotLines()@.
+plotLines :: (MonadIO m) => CString -> Ptr CFloat -> CInt -> m ()
+plotLines labelPtr valuesPtr valuesLen = liftIO do
+  [C.exp| void { PlotLines($(char* labelPtr), $(float* valuesPtr), $(int valuesLen)) } |]
 
 -- | Wraps @ImGui::PlotHistogram()@.
 plotHistogram :: (MonadIO m) => CString -> Ptr CFloat -> CInt -> m ()
@@ -1652,6 +1672,20 @@ setCursorPos :: (MonadIO m) => Ptr ImVec2 -> m ()
 setCursorPos posPtr = liftIO do
   [C.exp| void { SetCursorPos(*$(ImVec2* posPtr)) } |]
 
+-- | Get cursor position in window-local coordinates.
+--
+-- Useful to overlap draw using 'setCursorPos'.
+--
+-- Wraps @ImGui::SetCursorPos()@
+getCursorPos :: (MonadIO m) => m ImVec2
+getCursorPos = liftIO do
+  C.withPtr_ \ptr ->
+    [C.block|
+      void {
+        *$(ImVec2 * ptr) = GetCursorPos();
+      }
+    |]
+
 -- | Cursor position in absolute coordinates.
 --
 -- Useful to work with 'DrawList' API.

src/DearImGui/Raw/Context.hs

@@ -6,7 +6,7 @@
 {-# language PatternSynonyms #-}
 {-# language TemplateHaskell #-}
 
-module DearImGui.Context where
+module DearImGui.Raw.Context where
 
 -- containers
 import qualified Data.Map.Strict as Map

src/DearImGui/Raw/DrawList.hs

@@ -115,7 +115,7 @@ import Foreign hiding (new)
 import Foreign.C
 
 -- dear-imgui
-import DearImGui.Context
+import DearImGui.Raw.Context
   ( imguiContext )
 import DearImGui.Enums
 import DearImGui.Structs

src/DearImGui/Raw/Font.hs

@@ -41,7 +41,7 @@ import Foreign ( Ptr, castPtr )
 import Foreign.C
 
 -- dear-imgui
-import DearImGui.Context
+import DearImGui.Raw.Context
   ( imguiContext )
 import DearImGui.Structs
 import DearImGui.Raw.Font.Config

src/DearImGui/Raw/Font/Config.hs

@@ -46,7 +46,7 @@ import Foreign ( Ptr )
 import Foreign.C
 
 -- dear-imgui
-import DearImGui.Context
+import DearImGui.Raw.Context
   ( imguiContext )
 import DearImGui.Structs
 import DearImGui.Raw.Font.GlyphRanges

src/DearImGui/Raw/Font/GlyphRanges.hs

@@ -75,7 +75,7 @@ import Foreign.C
 import System.IO.Unsafe (unsafePerformIO)
 
 -- dear-imgui
-import DearImGui.Context
+import DearImGui.Raw.Context
   ( imguiContext )
 import DearImGui.Structs
 

src/DearImGui/Raw/IO.hs

@@ -39,7 +39,7 @@ import Foreign.C
   )
 
 -- dear-imgui
-import DearImGui.Context
+import DearImGui.Raw.Context
   ( imguiContext )
 -- import DearImGui.Enums
 -- import DearImGui.Structs

src/DearImGui/Raw/ListClipper.hs

@@ -59,7 +59,7 @@ import Foreign.C
 import System.IO.Unsafe (unsafePerformIO)
 
 -- dear-imgui
-import DearImGui.Context
+import DearImGui.Raw.Context
   ( imguiContext )
 import DearImGui.Structs
   ( ImGuiListClipper )

src/DearImGui/SDL.hs

@@ -50,7 +50,7 @@ import Control.Monad.IO.Class
 
 C.context (Cpp.cppCtx <> C.bsCtx)
 C.include "imgui.h"
-C.include "backends/imgui_impl_sdl.h"
+C.include "backends/imgui_impl_sdl2.h"
 C.include "SDL.h"
 Cpp.using "namespace ImGui"
 

src/DearImGui/SDL/OpenGL.hs

@@ -42,7 +42,7 @@ import Control.Monad.IO.Class
 C.context (Cpp.cppCtx <> C.bsCtx)
 C.include "imgui.h"
 C.include "backends/imgui_impl_opengl2.h"
-C.include "backends/imgui_impl_sdl.h"
+C.include "backends/imgui_impl_sdl2.h"
 C.include "SDL.h"
 C.include "SDL_opengl.h"
 Cpp.using "namespace ImGui"

src/DearImGui/SDL/Vulkan.hs

@@ -33,7 +33,7 @@ import Control.Monad.IO.Class ( MonadIO, liftIO )
 C.context Cpp.cppCtx
 C.include "imgui.h"
 C.include "backends/imgui_impl_vulkan.h"
-C.include "backends/imgui_impl_sdl.h"
+C.include "backends/imgui_impl_sdl2.h"
 C.include "SDL.h"
 C.include "SDL_vulkan.h"
 Cpp.using "namespace ImGui"

src/DearImGui/Structs.hs

@@ -1,5 +1,6 @@
 {-# LANGUAGE DuplicateRecordFields #-}
 {-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE RecordWildCards #-}
 {-# LANGUAGE CPP #-}
 
 module DearImGui.Structs where
@@ -13,11 +14,12 @@ import Data.Word
   )
 
 import Foreign
-  ( Storable(..), castPtr, plusPtr, Ptr, Int16 )
+  ( Storable(..), castPtr, plusPtr, Ptr, Int16, nullPtr )
 import Foreign.C
   ( CInt, CBool )
 
 import DearImGui.Enums
+import Data.Bits ((.&.))
 
 --------------------------------------------------------------------------------
 data ImVec2 = ImVec2 { x, y :: {-# unpack #-} !Float }
@@ -104,7 +106,7 @@ data ImGuiListClipper
 
 -- | A unique ID used by widgets (typically the result of hashing a stack of string)
 --   unsigned Integer (same as ImU32)
-type ImGuiID = Word32
+type ImGuiID = ImU32
 
 -- | 32-bit unsigned integer (often used to store packed colors).
 type ImU32 = Word32
@@ -125,62 +127,88 @@ type ImWchar = Word16
 --   When @SpecsDirty == true@ you can sort your data. It will be true with sorting specs have changed since last call, or the first time.
 --   Make sure to set @SpecsDirty = false@ after sorting, else you may wastefully sort your data every frame!
 data ImGuiTableSortSpecs = ImGuiTableSortSpecs
-     { imGuiTableColumnSortSpecs :: Ptr ImGuiTableColumnSortSpecs
+  { specs      :: Ptr ImGuiTableColumnSortSpecs
-     , imGuiTableSortSpecsCount :: CInt
+  , specsCount :: CInt
-     , imGuiTableSortSpecsDirty :: CBool
+  , specsDirty :: CBool
-     }
+  } deriving (Show, Eq)
 
 instance Storable ImGuiTableSortSpecs where
-  sizeOf _ = sizeOf (undefined :: Ptr ImGuiTableColumnSortSpecs)
+  sizeOf _ =
-           + sizeOf (undefined :: CInt)
+    sizeOf (undefined :: Ptr ImGuiTableColumnSortSpecs) +
-           + sizeOf (undefined :: CBool)
+    sizeOf (undefined :: CInt) +
+    sizeOf (undefined :: CBool)
 
-  alignment _ = 0
+  alignment _ =
+    alignment nullPtr
 
-  poke ptr (ImGuiTableSortSpecs s c d) = do
+  poke ptr ImGuiTableSortSpecs{..} = do
-    poke ( castPtr ptr                   ) s
+    let specsPtr = castPtr ptr
-    poke ( castPtr ptr `plusPtr` sizeOf s) c
+    poke specsPtr specs
-    poke ((castPtr ptr `plusPtr` sizeOf s)
+
-                       `plusPtr` sizeOf c) d
+    let specsCountPtr = castPtr $ specsPtr `plusPtr` sizeOf specs
+    poke specsCountPtr specsCount
+
+    let specsDirtyPtr = castPtr $ specsCountPtr `plusPtr` sizeOf specsCount
+    poke specsDirtyPtr specsDirty
 
   peek ptr = do
-    s <- peek ( castPtr ptr                   )
+    let specsPtr = castPtr ptr
-    c <- peek ( castPtr ptr `plusPtr` sizeOf s)
+    specs <- peek specsPtr
-    d <- peek ((castPtr ptr `plusPtr` sizeOf s)
+
-                            `plusPtr` sizeOf c)
+    let specsCountPtr = castPtr $ specsPtr `plusPtr` sizeOf specs
-    return (ImGuiTableSortSpecs s c d)
+    specsCount <- peek specsCountPtr
+
+    let specsDirtyPtr = castPtr $ specsCountPtr `plusPtr` sizeOf specsCount
+    specsDirty <- peek specsDirtyPtr
+
+    pure ImGuiTableSortSpecs{..}
 
 -- | Sorting specification for one column of a table
 data ImGuiTableColumnSortSpecs = ImGuiTableColumnSortSpecs
-     { imGuiTableColumnSortUserID      :: ImGuiID -- ^ User id of the column (if specified by a TableSetupColumn() call)
+  { columnUserID  :: ImGuiID            -- ^ User id of the column (if specified by a TableSetupColumn() call)
-     , imGuiTableColumnSortColumnIndex :: ImS16 -- ^ Index of the column
+  , columnIndex   :: ImS16              -- ^ Index of the column
-     , imGuiTableColumnSortOrder       :: ImS16 -- ^ Index within parent ImGuiTableSortSpecs (always stored in order starting from 0, tables sorted on a single criteria will always have a 0 here)
+  , sortOrder     :: ImS16              -- ^ Index within parent ImGuiTableSortSpecs (always stored in order starting from 0, tables sorted on a single criteria will always have a 0 here)
-     , imGuiTableColumnSortDirection   :: ImGuiSortDirection -- ^ 'ImGuiSortDirection_Ascending' or 'ImGuiSortDirection_Descending'
+  , sortDirection :: ImGuiSortDirection -- ^ 'ImGuiSortDirection_Ascending' or 'ImGuiSortDirection_Descending'
   } deriving (Show, Eq)
 
 instance Storable ImGuiTableColumnSortSpecs where
-  sizeOf _  = sizeOf (undefined :: ImGuiID)
+  sizeOf _ = 12
-            + sizeOf (undefined :: ImS16)
+  alignment _ = 4
-            + sizeOf (undefined :: ImS16)
-            + sizeOf (undefined :: ImGuiSortDirection)
 
-  alignment _ = 0
+  poke ptr ImGuiTableColumnSortSpecs{..} = do
+    let columnUserIDPtr = castPtr ptr
+    poke columnUserIDPtr columnUserID
 
-  poke ptr (ImGuiTableColumnSortSpecs a b c d) = do
+    let columnIndexPtr = castPtr $ columnUserIDPtr `plusPtr` sizeOf columnUserID
-    poke (  castPtr ptr                   ) a
+    poke columnIndexPtr columnIndex
-    poke (  castPtr ptr `plusPtr` sizeOf a) b
+
-    poke (( castPtr ptr `plusPtr` sizeOf a)
+    let sortOrderPtr = castPtr $ columnIndexPtr `plusPtr` sizeOf columnIndex
-                        `plusPtr` sizeOf b) c
+    poke sortOrderPtr sortOrder
-    poke (((castPtr ptr `plusPtr` sizeOf a)
+
-                        `plusPtr` sizeOf b)
+    let sortDirectionPtr = castPtr $ sortOrderPtr `plusPtr` sizeOf sortOrder
-                        `plusPtr` sizeOf c) d
+    poke sortDirectionPtr sortDirection
 
   peek ptr = do
-    a <- peek (  castPtr ptr                   )
+    let columnUserIDPtr = castPtr ptr
-    b <- peek (  castPtr ptr `plusPtr` sizeOf a)
+    columnUserID <- peek columnUserIDPtr
-    c <- peek (( castPtr ptr `plusPtr` sizeOf a)
+
-                             `plusPtr` sizeOf b)
+    let columnIndexPtr = castPtr $ columnUserIDPtr `plusPtr` sizeOf columnUserID
-    d <- peek (((castPtr ptr `plusPtr` sizeOf a)
+    columnIndex <- peek columnIndexPtr
-                             `plusPtr` sizeOf b)
+
-                             `plusPtr` sizeOf c)
+    let sortOrderPtr = castPtr $ columnIndexPtr `plusPtr` sizeOf columnIndex
-    return (ImGuiTableColumnSortSpecs a b c d)
+    sortOrder <- peek sortOrderPtr
+
+    let sortDirectionPtr = castPtr $ sortOrderPtr `plusPtr` sizeOf sortOrder
+    sortDirection' <- peek sortDirectionPtr :: IO CInt
+    -- XXX: Specs struct uses trimmed field: @SortDirection : 8@
+    let sortDirection = case sortDirection' .&. 0xFF of
+          0 ->
+            ImGuiSortDirection_None
+          1 ->
+            ImGuiSortDirection_Ascending
+          2 ->
+            ImGuiSortDirection_Descending
+          _ ->
+            error $ "Unexpected value for ImGuiSortDirection: " <> show sortDirection
+
+    pure ImGuiTableColumnSortSpecs{..}