Gamescope, an open source project from Valve that's part of what powers the Steam Deck, now has support for NVIDIA Image Scaling. So it now supports both FSR 1.0 and NVIDIA Image Scaling for various GPUs.
The merge request was opened on the same day NVIDIA made that massive announcement about having open source Linux GPU kernel modules and their new Beta Driver 515.43.04. That new driver version is also needed for NVIDIA users who want to try out Gamescope.
What is the point of Gamescope? Well, it handles the display of games in a way that keeps performance nice. If you're running it directly on top of a regular Linux desktop, it also prevents games from interfering with your desktop, plus it enables you to adjust all sorts of things like resolution, refresh rate and of course the extras like FSR 1.0 and now NVIDIA Image Scaling too.
The NVIDIA Image Scaling SDK provides a single spatial scaling and sharpening algorithm for cross-platform support. The scaling algorithm uses a 6-tap scaling filter combined with 4 directional scaling and adaptive sharpening filters, which creates nice smooth images and sharp edges. In addition, the SDK provides a state-of-the-art adaptive directional sharpening algorithm for use in applications where no scaling is required.NVIDIA GitHub
The directional scaling and sharpening algorithm is named NVScaler while the adaptive-directional-sharpening-only algorithm is named NVSharpen. Both algorithms are provided as compute shaders and developers are free to integrate them in their applications.