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ci(audience): swap llvmpipe -> lavapipe (Vulkan) for playmode-linux #758

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ImmutableJeffrey wants to merge 3 commits into from
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ci(audience): swap llvmpipe -> lavapipe (Vulkan) for playmode-linux #758

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737fcd0
ci(audience): install lavapipe + vulkan-tools in playmode-linux conta…
ImmutableJeffrey May 9, 2026
212aba0
ci(audience): drop -force-glcore so Unity 6 uses lavapipe Vulkan path
ImmutableJeffrey May 9, 2026
fcefaf8
ci(audience): upload vulkaninfo.txt artifact from playmode-linux cells
ImmutableJeffrey May 9, 2026
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27 changes: 21 additions & 6 deletions .github/workflows/test-audience-sample-app.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -509,6 +509,22 @@ jobs:
exit 1
fi

# Install Mesa software Vulkan (lavapipe) and vulkan-tools.
# The unityci/editor image is Debian-based; apt-get works as
# root inside the container.
echo "::group::install lavapipe"
apt-get update
DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
mesa-vulkan-drivers vulkan-tools
echo "::endgroup::"

# Force lavapipe selection if multiple Vulkan ICDs are present.
# MESA_VK_DEVICE_SELECT=lvp picks the LLVM-pipe Vulkan device.
export MESA_VK_DEVICE_SELECT=lvp

# Capture the Vulkan device list for post-run inspection.
vulkaninfo --summary > /github/workspace/artifacts/vulkaninfo.txt 2>&1 || true

# xvfb-run gives Unity a virtual X display so PlayMode tests
# that load scenes and exercise UI Toolkit can actually launch
# the player. GLX + render are required for UIElements; the
Expand Down Expand Up @@ -547,15 +563,13 @@ jobs:
# only on UI Toolkit log-row presence (queried via the
# VisualElement tree, not via screen capture).
#
# Why -force-glcore: Unity 6 prefers Vulkan on Linux and
# falls back to OpenGL when Vulkan init fails. Each frame
# carries the negotiation overhead. -force-glcore tells the
# player to skip Vulkan entirely and open a GLX context
# directly, the same path Unity 2021.3 takes by default.
# Vulkan via lavapipe is the experiment. We do not pass
# -force-glcore here so Unity 6 picks its native Vulkan
# path. Unity 2021.3 and 2022.3 still default to OpenGL on
# Linux; for them this is a no-op.
xvfb-run -a --server-args="-screen 0 320x240x24 -ac +extension GLX +render -noreset" -- \
unity-editor \
-batchmode \
-force-glcore \
-screen-fullscreen 0 \
-screen-width 320 \
-screen-height 240 \
Expand Down Expand Up @@ -729,6 +743,7 @@ jobs:
path: |
artifacts/playmode-results.xml
artifacts/playmode.log
artifacts/vulkaninfo.txt
artifacts/activation.log
artifacts/Player-*.log
examples/audience/Logs/**
Expand Down
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