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Silk.NET.OpenGL.Extensions.ImGui: Key mod not sent to ImGui IO · Issue #2501 · dotnet/Silk.NET · GitHub
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Silk.NET.OpenGL.Extensions.ImGui: Key mod not sent to ImGui IO #2501

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Silk.NET.OpenGL.Extensions.ImGui: Key mod not sent to ImGui IO#2501
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bugSomething isn't working

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@tvardero
tvardero
opened on Nov 15, 2025

Summary

Key mods like Ctrl, Alt, Shift are not sent to ImGUI during imguiController.Update((float)delta);

Steps to reproduce

Reproducible here: https://github.com/dotnet/Silk.NET/tree/main/examples/CSharp/OpenGL%20Demos
Windows 11, using WindowOptions.Default

  1. Add ImGui.ShowDemoWindow(); before imguiController.Render(); to draw demo window
  2. Start the project
  3. In demo window, navigate to "Inputs & Focus" category
  4. Press "Ctrl", "Ctrl+A", "Shift+Tab" or any other key combo with mod keys

Expected: Mods should appear in "Keys mods:" label. "Keys down:" label should show "ModCtrl", "ModShift", etc... together with "LeftCtrl", "LeftShift", etc...

Actual: Mods do not appear in "Keys mods:" label. "Keys down:" label contains only "LeftCtrl", "LeftShift", etc... This results in shortcuts not working at all. You can test shortcuts in "Shortcuts" subcategory of "Inputs & Focus"

Comments

Issue is somewhere here

Silk.NET/src/OpenGL/Extensions/Silk.NET.OpenGL.Extensions.ImGui/ImGuiController.cs

Line 250 in 3c0313b

private void UpdateImGuiInput()

Activity

  1. tvardero
    added
    bugSomething isn't working
    on Nov 15, 2025
  2. github-project-automation
    added this to Silk.NET Development Trackeron Nov 15, 2025
  3. github-project-automation
    moved this to Todo in Silk.NET Development Trackeron Nov 15, 2025

  4. tvardero commented on Nov 15, 2025

    @tvardero
    tvardero
    on Nov 15, 2025
    Author

    Current workaround:

    // Add this after imGuiController.Update((float)delta);
var io = ImGui.GetIO();
var keyboard = input.Keyboards[0];

io.AddKeyEvent(ImGuiKey.ModAlt, keyboard.IsKeyPressed(Key.AltLeft) || keyboard.IsKeyPressed(Key.AltRight));
io.AddKeyEvent(ImGuiKey.ModSuper, keyboard.IsKeyPressed(Key.SuperLeft) || keyboard.IsKeyPressed(Key.SuperRight));
io.AddKeyEvent(ImGuiKey.ModCtrl, keyboard.IsKeyPressed(Key.ControlLeft) || keyboard.IsKeyPressed(Key.ControlRight));
io.AddKeyEvent(ImGuiKey.ModShift, keyboard.IsKeyPressed(Key.ShiftLeft) || keyboard.IsKeyPressed(Key.ShiftRight));

    Related: ocornut/imgui#5047

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