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ci(audience): build SwiftShader Vulkan ICD for Unity 6 Linux PlayMode #763

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ci(audience): build SwiftShader Vulkan ICD for Unity 6 Linux PlayMode #763

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46 changes: 40 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 +509,41 @@ jobs:
exit 1
fi

# Build SwiftShader (Google's CPU Vulkan ICD) from source.
# Apt does not package SwiftShader on Ubuntu. Build is roughly
# 5 to 10 minutes, single-threaded steps near the end. The ICD
# JSON is registered via VK_ICD_FILENAMES.
echo "::group::install build deps"
apt-get update
DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
git cmake ninja-build build-essential vulkan-tools libvulkan1
echo "::endgroup::"

echo "::group::clone + build SwiftShader"
ss_dir=/tmp/swiftshader
git clone --depth=1 https://swiftshader.googlesource.com/SwiftShader "$ss_dir"
cmake -S "$ss_dir" -B "$ss_dir/build" -G Ninja \
-DCMAKE_BUILD_TYPE=Release \
-DSWIFTSHADER_BUILD_VULKAN=ON \
-DSWIFTSHADER_BUILD_TESTS=OFF \
-DSWIFTSHADER_BUILD_BENCHMARKS=OFF
cmake --build "$ss_dir/build" --target vk_swiftshader
echo "::endgroup::"

# The build produces vk_swiftshader_icd.json next to libvk_swiftshader.so.
icd=$(find "$ss_dir/build" -name vk_swiftshader_icd.json | head -1)
if [ -z "$icd" ]; then
echo "::error::SwiftShader build did not produce vk_swiftshader_icd.json"
find "$ss_dir/build" -name "*swiftshader*" 2>/dev/null | head -10
exit 1
fi
echo "SwiftShader ICD at $icd"
export VK_ICD_FILENAMES="$icd"

# Capture device list for post-run confirmation. If SwiftShader is
# discovered, this prints "deviceName: SwiftShader Device".
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 +582,13 @@ 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.
# This PR tests SwiftShader Vulkan (registered via
# VK_ICD_FILENAMES above) instead of forcing OpenGL. Unity 6
# is allowed to pick its preferred backend; if Vulkan init
# fails it falls back to OpenGL via mesa-llvmpipe.
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 @@ -730,6 +763,7 @@ jobs:
artifacts/playmode-results.xml
artifacts/playmode.log
artifacts/activation.log
artifacts/vulkaninfo.txt
artifacts/Player-*.log
examples/audience/Logs/**

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