Dear Imgui Hook for Reloaded

Making life a bit easier.
Current ImGui Version: 1.88 Docking

Nuget

Introduction

Reloaded.Imgui.Hook is a simple personal use utility library that can be used to inject Dear ImGui into the current process.

It is based off of DearImguiSharp, my personal use bindings library for Dear ImGui built ontop of cimgui.

Nekopara 0 by Neko Works

Basic Usage

Install Reloaded.Imgui.Hook from NuGet and/or the required implementations of your choice

Direct3D9: Reloaded.Imgui.Hook.Direct3D9
Direct3D11: Reloaded.Imgui.Hook.Direct3D11

Injecting the Overlay

First call SDK.Init to initialize all static variables used by the library, then simply call ImguiHook.Create with an appropriate delegate.

// During initialization.
SDK.Init(_hooks);
_imguiHook = await ImguiHook.Create(RenderTestWindow, new ImguiHookOptions()
{
    Implementations = new List<IImguiHook>()
    {
        new ImguiHookDx9(), // `Reloaded.Imgui.Hook.Direct3D9`
        new ImguiHookDx11() // `Reloaded.Imgui.Hook.Direct3D11`
    }
}).ConfigureAwait(false);

private void RenderTestWindow()
{
    ImGuiNET.ImGui.ShowDemoWindow();
}

The _hooks variable is an instance of IReloadedHooks from Reloaded.Hooks. In a Reloaded-II mod, this is part of your mod template. Otherwise, add Reloaded.Hooks to your project and pass new ReloadedHooks() to the method.

Enabling Docking Support

Use the specialised overload with ImguiHookOptions.

await ImguiHook.Create(RenderTestWindow, new ImguiHookOptions()
{
    EnableViewports = true, // Enable docking.
    IgnoreWindowUnactivate = true // May help if game pauses when it loses focus.
}).ConfigureAwait(false);

Enabling / Disabling the Overlay

// Deactivate
_imguiHook.Disable();

// Activate
_imguiHook.Enable();

Leveraging the capabilities of Reloaded.Hooks, you can even unload your Assembly (DLL) from the process once you disable if you wish.

Support

D3D9
D3D9Ex
D3D11

Implemented backends should support window resizing and device resets (fullscreen/windowed switching) etc.
PRs for supporting other backends (especially OpenGL3 & Vulkan) would be very welcome. My DearImguiSharp does support them, so half of the work's already done.

In The Future

Extensibility. Provide workarounds for possible edge cases such as SRGB colour space.

Testing

If you would like to try the library, try the test mod for Reloaded-II available in this repository.

Simply compile Reloaded.ImGui.TestMod, it will show up in your Reloaded-II's mod list.

Known Issues

[14 August 2021]: When viewports are Enabled and being used (window outside app/game window), destroying the hook instance (and this imgui context) may crash the application. I believe this a dear imgui issue.

Contributions

Contributions are very welcome and encouraged; especially given that I'm not really a graphics programmer. I only have some experience in OpenGL 3 as opposed to DirectX 😉.

Feel free to implement new features, make bug fixes or suggestions so long as they are accompanied by an issue with a clear description of the pull request.

Sewer56 / Reloaded.Imgui.Hook

readme