Both d7976326 bugs passed every unit test while corrupting real frames -
state-level assertions cannot see them. This module renders and reads
back.
A headless EGL-pbuffer harness (no window, no GLFW) linking MobileGL_s
directly, registered once per backend under the ctest label
integration-gpu, behind the default-OFF option
MOBILEGL_BUILD_INTEGRATION_TEST. The platform pre-flight runs the ENTIRE
bring-up in a forked child first - MobileGL aborts rather than returning
errors on an unusable platform, and the child dying on any signal turns
into a clean GTEST_SKIP instead of taking the test binary down.
MOBILEGL_ITEST_REQUIRE_GPU makes the label falsifiable: with it set, an
unusable harness (or a context that lands on a software rasterizer) is a
FAILURE - without it, a CI runner whose driver pinning silently broke
reports the same green as one that rendered every frame. Configure-time
detection pins the EGL vendor and Vulkan ICD jsons, preferring hardware
vendors and never selecting llvmpipe/lavapipe.
Scenarios assert on glReadPixels with whole-region pixel counts (a
2x2 quadrant pattern whose signature distinguishes all eight square
symmetries; every region predicate reports the first offending pixel):
- OrientationScenario: default -> FBO -> default, pinning the
transform-flags memo key. Keying GetBaseTransformFlagsRaw on the
pre-transform alone fails exactly 3 entries.
- StreamedArenaScenario: an untouched streamed vertex buffer must
survive transient-arena recycling. Re-enabling only the cross-frame
vertex revalidation fails exactly this entry.
- CrossFrameBufferScenario + ResidentIndexScenario: cross-frame
mutation matrix (SubData, map/unmap, persistent+flush, coherent
persistent, orphan, CopyBufferSubData; vertex and index) plus six
adversarial resident-EBO constructions. Instrumentation showed the
cross-frame EBO memo cannot be made to serve wrong bytes from GL
level on this stack (89 entries, 81 accepts, zero divergent slices) -
these cases are freshness tripwires, documented as such in-file; the
EBO half of d7976326 remains unpinned by a failing test.
At the buggy commit 72ee7c43 the suite fails 4 entries (3 orientation +
1 streamed-arena); at d7976326 all 52 pass, 5 consecutive runs, zero
flakes, and the default build is bit-for-bit unaffected (unit suite
unchanged). Adversarially verified twice, including hostile-platform
sweeps (26 configurations, all clean skips) and hand-edits of each
production hole in isolation.
