60 lines
1.9 KiB
Nix
60 lines
1.9 KiB
Nix
{ lib, pkgs, ... }:
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let
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# GNOME/mutter!3797, pinned because the MR is still under development.
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mutterTearingRevision = "a8d56d423edde9e6d76f6b9cab663d82c65cf1a2";
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mutterTearingPatch = pkgs.fetchurl {
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url = "https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3797.diff";
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hash = "sha256-3up5PsHX+BSQRKb9JS5bnJLPaTGmvV55M18tKkepIng=";
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};
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in
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{
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nixpkgs.overlays = [
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(final: prev: {
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mutter = prev.mutter.overrideAttrs (old: {
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pname = "mutter-tearing";
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# nixpkgs leaves Mutter's verbose topics compiled out by default.
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# This is required for MUTTER_DEBUG=kms to emit the async commit flags.
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mesonFlags = (old.mesonFlags or [ ]) ++ [ ];
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# The MR currently targets Mutter 51. Apply it to the packaged Mutter
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# 50 source, then resolve the four small context conflicts separately.
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prePatch = ''
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${old.prePatch or ""}
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set +e
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patch --batch -p1 --forward < ${mutterTearingPatch}
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mr_status=$?
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set -e
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if [ "$mr_status" -ne 0 ]; then
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reject_count="$(find . -name '*.rej' -type f | wc -l)"
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if [ "$reject_count" -ne 3 ]; then
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echo "Unexpected number of Mutter !3797 rejects: $reject_count" >&2
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exit 1
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fi
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fi
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patch --batch -p1 --forward < ${./mutter-50-tearing-compat.patch}
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find . -name '*.rej' -type f -delete
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'';
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passthru = (old.passthru or { }) // {
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tearingMr = 3797;
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tearingRevision = mutterTearingRevision;
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};
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});
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})
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];
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environment.sessionVariables = {
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# Mutter keeps tearing support behind an experimental runtime switch.
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MUTTER_DEBUG_EXPERIMENTAL_FEATURES = lib.mkDefault "tearing";
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# Temporarily expose whether async atomic commits reach KMS or fall back
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# to synchronized presentation. Remove this after collecting the log.
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# MUTTER_DEBUG = lib.mkDefault "kms";
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};
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}
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