Set real-time GPU priority in SwapChainProcessor

[z0Kng]

Problem: Low Display Update Rate Under High GPU Load
Under high GPU load, the display driver can become starved of GPU resources, resulting in a low display update rate and visible stuttering, even when the application rendering 3D content maintains a high frame rate. Focusing the application window that generates high GPU load worsens the issue due to Windows prioritizing its GPU usage.

Screencast_20250731_090349.webm

Steps to Reproduce

1. Launch FurMark 2.
2. Ensure the FurMark window is focused (this is important, as Windows will prioritize rendering for the focused application).
3. Observe that while FurMark maintains a high FPS, the desktop display update rate drops significantly and exhibits stuttering.

Proposed Fix
Set the display driver's GPU thread to real-time priority using IddCxSetRealtimeGPUPriority. This ensures that the Idd receives adequate GPU resources to maintain a consistent and smooth output.

[malayaku]

Thanks for the commit. We’re currently reviewing the changes and testing them along with several other upcoming commits under evaluation at our end.