https://github.com/PancakeTAS/lsfg-vk
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lsfg-vk
This project brings Lossless Scaling's Frame Generation to Linux!
How does it work?
LSFG is primarily written in DirectX 11 compute shaders, which means we can use DXVK to translate it into SPIR-V. The surrounding parts have been rewritten in plain Vulkan code in order to make LSFG run natively on Linux. By specifying an LD_PRELOAD, lsfg-vk can place itself inbetween your game and Vulkan. That way it can fetch frames from the game and insert its own frames without any problems. (Beware of anticheats please!)
Building, Installing and Running
In order to compile LSFG, make sure you have the following components installed on your system:
Traditional build tools (+ bash, sed, git)
Clang compiler (this project does NOT compile easily with GCC)
Vulkan and SPIR-V header files
CMake build system
Meson build system (for DXVK)
Ninja build system (backend for CMake)
openssl's libcrypto
Compiling lsfg-vk is relatively straight forward, as everything is neatly integrated into CMake:
$ CC=clang CXX=clang++ cmake -B build -G Ninja \
-DCMAKE_BUILD_TYPE=Release \
-DCMAKE_INSTALL_PREFIX=absolute-install-path-here
$ cmake --build build
$ cmake --install build
(Make sure you change absolute-install-path-here to the path you'd like to install this project to)
Next, you'll need to download Lossless Scaling from Steam. Switch to the legacy_2.13 branch or download the corresponding depot. Copy or note down the path of "Lossless.dll" from the game files.
Finally, let's actually start a program with frame generation enabled. I'm going to be using vkcube for this example:
LD_PRELOAD="/home/pancake/.lsfg-vk/liblsfg-vk.so" LSFG_DLL_PATH="/home/pancake/games/Lossless Scaling/Lossless.dll" LSFG_MULTIPLIER=4 vkcube
Make sure you adjust the paths. Let's examine each one:
LD_PRELOAD: This is how you let the loader know that you want to load lsfg-vk before anything else. This HAS to be either an ABSOLUTE path, or a path starting with ./ to make it relative. Specify liblsfg-vk.so here.
LSFG_DLL_PATH: Here you specify the Lossless.dll you downloaded from Steam. This is either an absolute path, or a relative path from where you are running the app.
LSFG_MULTIPLIER: This is the multiplier you should be familiar with. Specify 2 for doubling the framerate, etc.
Warning
Unlike on Windows, LSFG_MULTIPLIER is heavily limited here (at the moment!). If your hardware can create 8 swapchain images, then setting LSFG_MULTIPLIER to 4 occupies 4 of those, leaving only 4 to the game. If the game requested 5 or more, it will crash.
