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ci: wrap Linux strict-GPU test in xvfb + force Mesa llvmpipe

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Hosted Ubuntu runner has libegl1-mesa-dev installed but no X display, so
`eglInitialize` fails with 'EGL is not initialized, or could not be
initialized, for the specified EGL display connection'.

xvfb gives EGL_DEFAULT_DISPLAY a real X11 connection so eglInitialize
succeeds; LIBGL_ALWAYS_SOFTWARE + llvmpipe + MESA_GL_VERSION_OVERRIDE
forces Mesa software pipe (no GPU on runner). Together these unblock
the EGL pbuffer GPU smoke + chrome+stub composition tests on Linux CI.
This commit is contained in:
Kayshen-X 2026-05-05 22:27:00 +08:00
parent 919a1381f2
commit adff3c4351
1 changed files with 14 additions and 3 deletions
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17
.github/workflows/rust-multiplatform.yml vendored
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@ -72,7 +72,8 @@ jobs:
libxkbcommon-dev libxkbcommon-x11-dev \
libwayland-dev libxcb-render0-dev libxcb-shape0-dev libxcb-xfixes0-dev \
libegl1-mesa-dev libgles2-mesa-dev libgbm-dev mesa-utils \
libfreetype-dev libfontconfig1-dev
libfreetype-dev libfontconfig1-dev \
xvfb
- name: Install cross
if: matrix.cross == true
run: cargo install cross --locked --version 0.2.5
@ -82,11 +83,21 @@ jobs:
- name: Build (cross)
if: matrix.cross == true
run: cross build --workspace --target ${{ matrix.target }} --release
- name: Test (host, Linux strict-GPU)
- name: Test (host, Linux strict-GPU under Xvfb)
if: matrix.cross == false && runner.os == 'Linux'
env:
STEP1A_REQUIRE_GPU: '1'
run: cargo test --workspace --target ${{ matrix.target }}
# Force Mesa software-rendered llvmpipe so EGL pbuffer surfaces work
# on hosted runners without a real GPU. See spec §9.2 + plan v7
# P0 platform gotcha #3 (Linux GPU smoke window-based deferred;
# EGL pbuffer non-ignored).
LIBGL_ALWAYS_SOFTWARE: '1'
GALLIUM_DRIVER: llvmpipe
MESA_GL_VERSION_OVERRIDE: '4.5'
# xvfb-run gives the Mesa EGL provider a real X11 display connection;
# EGL_DEFAULT_DISPLAY then resolves to an initialised display rather
# than the headless DRI fallback that fails `eglInitialize`.
run: xvfb-run -a cargo test --workspace --target ${{ matrix.target }}
- name: Test (host, macOS / Windows)
if: matrix.cross == false && runner.os != 'Linux'
run: cargo test --workspace --target ${{ matrix.target }}