ReactOS developers are working to integrate the Windows Display Driver Model (WDDM) into the Windows-alternative OS as Microsoft phases out Windows 10. This development could improve ReactOS compatibility with modern GPU hardware.
Integration Challenges
Developer The_DarkFire_ shed light on the challenges faced while incorporating WDDM into ReactOS. The major hurdle is the lack of detailed documentation for the existing XDDM and WDDM implementations. However, the rise of open-source GPU drivers has provided new insights into these display models.
According to The_DarkFire_, the key to integrating WDDM lies in building a robust XDDM stack since WDDM drivers build upon XDDM foundations. The primary distinction between them is the removal of the miniport driver in WDDM.
Experimental Progress
In experimental implementations, ReactOS successfully demonstrated a basic display adapter working with several vendor-specific GPU drivers. This included compatibility with an Nvidia Windows 7 driver, which effectively drove modern monitors at full resolution and refresh rates.
Moving to WDDM is crucial, as it is the standard driver model in modern Windows operating systems. WDDM allows for essential features such as the Desktop Window Manager (DWM), virtual GPU memory, and prevents a system crash in case of a GPU driver failure by enabling user-mode driver operation.
Implications for ReactOS
As an open-source project capable of running Windows software and drivers, ReactOS resembles older Windows versions but lacks many modern features. Though not a full-fledged replacement for Windows 10, adding WDDM support would significantly enhance its compatibility with contemporary GPU hardware.
