RetroArch shaders

Rio allow to configure filters based on RetroArch shaders: github.com/libretro/slang-shaders.

[renderer]
filters = [
  # load builtin filter
  "newpixiecrt",
  
  # or load your own filter
  "/Users/raphael/Downloads/slang-shaders-master/crt/newpixie-crt.slangp"
]

Requirements

The filter chain is implemented on top of librashader and only runs on the wgpu backend. It is gated behind the wgpu Cargo feature.

• Windows / WebAssembly — wgpu is enabled by default; filters work out of the box.

• macOS / Linux — the default builds use the native Metal / Vulkan backends, which do not include the librashader filter chain. To use filters, build with the feature enabled and select the Webgpu renderer in your config:

  cargo build --release --features wgpu

  [renderer]
  backend = "Webgpu"

If filters is set but the active backend is one of the native backends (Metal on macOS, Vulkan on Linux), the configuration is accepted but the filter chain is not applied.