Pyroveil

Pyroveil is a Vulkan layer that can automatically replace shaders or roundtrip them via SPIRV-Cross -> glslang. This can create SPIR-V that is more compatible with NVIDIA drivers in particular.

Checkout and build

Make sure to install git, cmake, ninja and gcc toolchains first (often called base-devel or similar).

git clone https://github.com/HansKristian-Work/pyroveil.git
cd pyroveil
git submodule update --init
cmake . -Bbuild -G Ninja -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=$HOME/.local
ninja -C build install

Alternative path if using Steam Flatpak. (I assume this is correct).

cmake . -Bbuild -G Ninja -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=$HOME/.var/app/com.valvesoftware.Steam/.local

To use

The layer needs a config file to operate. See the folders under hacks/ for some ready to go config files. Use PYROVEIL_CONFIG=/path/to/pyroveil.json to pick the config you want. In Steam, run the game with PYROVEIL=1 %command%.

To know that it's active, run grep "pyroveil:" ~/steam-$appid.txt on the PROTON_LOG output. You should see, e.g.:

pyroveil: Found config in /tmp/pyroveil.json!
pyroveil: Adding match for spirvExecutionModel: 5365 (MeshEXT).
pyroveil: Adding GLSL roundtrip via SPIRV-Cross for match.
...
pyroveil: Found match for execution model in 55736cd1c3064f67.
...

Some config files use a roundtripCache to provide patched SPIR-V. In this case, cache/ folder next to pyroveil.json must also be copied. It is likely easier to simply use the path that you checked out for the pyroveil.json. E.g.

PYROVEIL=1 PYROVEIL_CONFIG=/path/to/pyroveil/checkout/hacks/monster-hunter-wilds-nv/pyroveil.json