fix(linux): bootstrap Flutter EGL on an isolated worker - #273
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- TEMPORARY push trigger on this branch while under test on the self-hosted runner; remove before merging. - Fall back to :0 when the x11-display input is absent (push events have no inputs context, which would otherwise blank DISPLAY). - Distro-aware dependency step: keep apt-get for Ubuntu, add a dnf path for Fedora that no-ops when deps are preinstalled and sudo needs a password. Co-Authored-By: Claude <noreply@anthropic.com>
- ThermionFlutterPluginInitializer -> ThermionTextureBootstrap, moved into the widgets layer next to ViewerWidget; the name now says what it does (deferred texture handshake) instead of implying a scope. - The plugin no longer constructs widgets: buildInitializationScope is replaced by createContextBootstrap/destroyContextBootstrap, which default to null/no-op for platforms without the Linux OpenGL prerequisite. - The injected allocator pair stays a unit: with an injected create hook, destruction falls back to the descriptor, never the plugin. No behavior change; sequencing and dispose-races are covered by texture_bootstrap_test and lifecycle_test. Co-Authored-By: Claude <noreply@anthropic.com>
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The branch was validated on the self-hosted X11/Wayland runner; keep the workflow dispatch-only for future manual runs. Co-Authored-By: Claude <noreply@anthropic.com>
This was referenced Aug 22, 2026
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On Linux+EGL, Flutter only exposes the real raster EGLDisplay/EGLContext while
FlTextureGL.populateruns, so desktop EGL initialization and texture operations cannot safely run on the Flutter GTK platform or raster threads.The fix:
populate.The bootstrap is a narrow texture-ID handshake and does not enter the platform surface descriptor registry. This removes the GDK-context fallback and the separate direct-EGLImage allocation/cleanup implementation.
We also add a smoke test on both X11 and a headless Weston GL compositor with
GDK_BACKEND=waylandand noDISPLAY, preventing XWayland fallback. This must run on a self-hosted runner with a real GPU and read/write access to/dev/dri/renderD128.