Viewports, Backends: DX12: Make secondary viewport format match main viewport one (#3462) {@BeastLe9enD]

examples/imgui_impl_dx12.cpp

@@ -806,7 +806,7 @@ static void ImGui_ImplDX12_CreateWindow(ImGuiViewport* viewport)
     sd1.BufferCount = g_numFramesInFlight;
     sd1.Width = (UINT)viewport->Size.x;
     sd1.Height = (UINT)viewport->Size.y;
-    sd1.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
+    sd1.Format = g_RTVFormat;
     sd1.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
     sd1.SampleDesc.Count = 1;
     sd1.SampleDesc.Quality = 0;