Engine 0051: on the GPU path WebGL asks EGL for its context and is not blocklisted there; the
Adreno 220's GL_INVALID_ENUM for the stencil back write mask no longer fails the context's init;
every pbuffer context on the GPU path is in one share group, so a canvas's texture is composited
with no readback (the driver has no EGLImage from a GL texture); a context is released from its
thread before it is destroyed (the second WebGL page closed faulted in libGLESv2 before).
JIHAD_GPU_NO_SHARE=1 keeps contexts unshared, read back through a canvas-sized pbuffer. On the
software path WebGL stays off.
Engine 0052 and the daemon: a compose job gives the columns its bands are stale in, the poll
reports the columns the composite changed, each slot keeps its stale columns as it keeps its rows,
and a narrow change's bands are read as one column (the compositor job 44 ms against 47 for a
480 px canvas; JIHAD_GPU_NO_COLUMN_READ=1 reads whole rows). The slot's own frame is the base when
its stale rows beyond the last three frames' changes are few: the 480 px canvas copied the whole
frame from the newest slot every frame to read the same rows.
The test page render/goanna/test/jihad-webgl-cube.html (a spinning textured cube; size, checks,
context loss, the missing extensions, a stop and a counter beside the canvas for the verify mode).
Rounds 281-313 (docs/rounds/t502-2026-10-17/webgl-r281-313.txt): contexts on the GPU path, none
on the software path; the cube renders right; 8 card open/close cycles and a lose/restore without
a fault; the spot checks pass, the four missing extensions listed; the column read verified against
whole composites with a change outside the canvas's columns. Open: the 480 px cube draws 21.5-25 fps
but the card gets 18-20.5 (240 px 26.5-27): the compositor job's floor, carried by T-517.
Also: adapter-install.sh no longer turns on the adapter's paint log (its gate filled /var and hung
the daemon in a journal commit); crash reports list every executable mapping; gpu-bench section 17
(no EGLImage from a GL texture) and the GL extension list.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01J67ZH8aYy8uzhgZDZ6Nvx9
NotAlexNoyleandClaude Opus 5.5
8518970ce0