The DirectX 12 renderer uses Microsoft’s DirectX 12, which is exclusive to Windows-based operating systems.

Testing the DirectX 12 renderer

Add the following line to Config/cmake/UImGuiDemo.cmake:

set(IMGUI_BUILD_WITH_DX12 ON)

In Source/Instance.hpp, you can include it like this:

#ifdef _WIN32
    #include <UImGuiRendererExamples/dx12/dx12.hpp>
#endif

And create an instance of the UImGuiRendererExamples::DX12Renderer as a member variable inside the UImGuiDemo::Instance class.

After that, in Source/Instance.cpp, make sure your constructor looks like this:

UImGuiDemo::Instance::Instance() noexcept
{
    initInfo =
    {
        .titlebarComponents = { reinterpret_cast<UImGui::TitlebarComponent*>(&title) },
        .windowComponents = { reinterpret_cast<UImGui::WindowComponent*>(&demoWindow) },
#ifdef _WIN32
        .customRenderer = &dx12Renderer,
#endif
        UIMGUI_INIT_INFO_DEFAULT_DIRS,
    };
}

Testing the custom texture renderer

A custom texture renderer is also provided. To use it, include the following in Source/Instance.hpp:

#ifdef _WIN32
    #include <UImGuiRendererExamples/dx12/dx12.hpp>    
    #include <UImGuiRendererExamples/dx12/dx12_texture.hpp>
#endif

Create an instance of UImGuiRendererExamples::DX12Texture as a member variable inside the UImGuiDemo::Instance class and then pass the instance to the init info:

UImGuiDemo::Instance::Instance() noexcept
{
    initInfo =
    {
        .titlebarComponents = { reinterpret_cast<UImGui::TitlebarComponent*>(&title) },
        .windowComponents = { reinterpret_cast<UImGui::WindowComponent*>(&demoWindow) },
#ifdef _WIN32
        .customRenderer = &dx12Renderer,
        .customTexture = &dx12Texture,
#endif
        UIMGUI_INIT_INFO_DEFAULT_DIRS,
    };
}