tl;dr: Half-Life 2 now runs natively on HaikuOS via the nillerusr Source engine port, leveraging a new Nvidia driver ("Nebula") that supports Turing and Ampere GPUs (e.g., GTX 1650–RTX 2060), with users reporting high framerates at 1440p. DisplayPort support is reportedly ready but unreleased, and HDMI audio was briefly enabled before being reverted pending a workaround. Newer Lovelace/Ada cards (RTX 40/50 series) aren't supported yet due to missing firmware blobs.