mirror of
https://github.com/MobileGL-Dev/MobileGL
synced 2026-09-10 13:18:31 +09:00
469 lines
29 KiB
Markdown
469 lines
29 KiB
Markdown
# MobileGL trace replay
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This directory builds a Linux command line replay runner for [apitrace](https://github.com/apitrace/apitrace) files. It
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is an integration testing infrastructure of MobileGL.
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The bundled fixtures cover:
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- OpenRA: sourced from GL4ES' apitrace corpus.
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- minecraft-1.21.4-startup: captured from Minecraft 1.21.4's startup screen.
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- minecraft-1.21.4-main-menu: captured from Minecraft 1.21.4's main menu.
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- minecraft-1.17-main-menu-854: captured from Minecraft 1.17's 854x480 main menu through FCL MobileGL capture.
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- minecraft-1.21.4-in-world: captured from Minecraft 1.21.4 after entering a singleplayer world.
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- minecraft-1.21.4-fabric-sodium-in-world: captured from Minecraft 1.21.4 Fabric with Sodium after entering a
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singleplayer world with Fancy graphics.
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- minecraft-26.2-main-menu: captured from Minecraft 26.2's main menu.
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- minecraft-26.2-in-world: captured from Minecraft 26.2 after entering a normal singleplayer world.
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- improved-transparency-minecraft-26.3: captured from the Minecraft 26.3 improved-transparency scene.
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- minecraft-1.21.4-fabric-common-mods-in-world: captured from Minecraft 1.21.4 Fabric with Sodium, Iris, REI,
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Xaero's Minimap, Xaero's World Map, JourneyMap, and Modern UI, with shader packs disabled.
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- minecraft-1.21.4-fabric-common-mods-inventory: captured from Minecraft 1.21.4 Fabric with Sodium, Iris, REI,
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Xaero's Minimap, Xaero's World Map, JourneyMap, and Modern UI with the creative inventory and REI item list open.
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- minecraft-1.21.4-fabric-rei-inventory: captured from Minecraft 1.21.4 Fabric with Sodium, Iris, and REI, with
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shader packs disabled and the creative inventory and REI item list open.
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- minecraft-1.21.4-fabric-xaero-minimap-in-world: captured from Minecraft 1.21.4 Fabric with Sodium, Iris, and
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Xaero's Minimap after entering a singleplayer world with shader packs disabled.
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- minecraft-1.21.4-fabric-xaero-world-map-in-world: captured from Minecraft 1.21.4 Fabric with Sodium, Iris, and
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Xaero's World Map, with shader packs disabled and the world map screen open.
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- minecraft-1.21.4-fabric-journeymap-in-world: captured from Minecraft 1.21.4 Fabric with Sodium, Iris, and
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JourneyMap after entering a singleplayer world with shader packs disabled.
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- minecraft-1.21.4-fabric-modernui-inventory: captured from Minecraft 1.21.4 Fabric with Sodium, Iris, and Modern UI,
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with shader packs disabled and the creative inventory open.
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- minecraft-1.21.4-fabric-rei-inventory-normal-world: captured from Minecraft 1.21.4 Fabric with Sodium, Iris, and
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REI in a normal singleplayer world, with shader packs disabled and the creative inventory and REI item list open.
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- minecraft-1.21.4-fabric-xaero-minimap-in-world-normal-world: captured from Minecraft 1.21.4 Fabric with Sodium,
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Iris, and Xaero's Minimap after entering a normal singleplayer world with shader packs disabled.
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- minecraft-1.21.4-fabric-xaero-world-map-in-world-normal-world: captured from Minecraft 1.21.4 Fabric with Sodium,
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Iris, and Xaero's World Map in a normal singleplayer world, with shader packs disabled and the world map screen open.
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- minecraft-1.21.4-fabric-journeymap-in-world-normal-world: captured from Minecraft 1.21.4 Fabric with Sodium, Iris,
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and JourneyMap after entering a normal singleplayer world with shader packs disabled.
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- minecraft-1.21.4-fabric-modernui-inventory-normal-world: captured from Minecraft 1.21.4 Fabric with Sodium, Iris,
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and Modern UI in a normal singleplayer world, with shader packs disabled and the creative inventory open.
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- minecraft-1.21.4-fabric-iris-bsl-in-world: captured from Minecraft 1.21.4 Fabric with Sodium, Iris, and BSL
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Shaders after entering a singleplayer world.
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- minecraft-1.21.4-fabric-iris-bsl-esc-menu-854: captured on an Android device (Mali-G77, FCL MobileGL capture) from
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Minecraft 1.21.4 Fabric with Sodium, Iris, and BSL Shaders, at the pause menu over a BSL-blurred world. The frame
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pins glyph rendering: every menu label, the menu title and the tutorial toast must be present. Regressions in the
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DirectGLES per-draw texture memo have made the whole text path disappear here while sprites kept rendering, so a
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failure that leaves the buttons but empties them is the signature to look for in the diff.
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- minecraft-1.21.4-fabric-iris-makeup-ultrafast-in-world: captured from Minecraft 1.21.4 Fabric with Sodium, Iris, and
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MakeUP UltraFast after entering a singleplayer world.
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- minecraft-1.21.4-fabric-iris-super-duper-vanilla-in-world: captured from Minecraft 1.21.4 Fabric with Sodium, Iris,
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and Super Duper Vanilla after entering a singleplayer world.
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- minecraft-1.21.4-fabric-iris-complementary-reimagined-in-world: captured from Minecraft 1.21.4 Fabric with Sodium,
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Iris, and Complementary Reimagined after entering a singleplayer world.
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- minecraft-1.21.4-fabric-iris-complementary-unbound-in-world: captured from Minecraft 1.21.4 Fabric with Sodium,
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Iris, and Complementary Unbound after entering a singleplayer world.
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- minecraft-1.21.4-fabric-iris-mellow-in-world: captured from Minecraft 1.21.4 Fabric with Sodium, Iris, and Mellow
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after entering a singleplayer world.
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- minecraft-1.21.4-fabric-iris-nostalgia-in-world: captured from Minecraft 1.21.4 Fabric with Sodium, Iris, and
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Nostalgia after entering a singleplayer world.
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- minecraft-1.21.4-fabric-iris-bliss-in-world: captured from Minecraft 1.21.4 Fabric with Sodium, Iris, and Bliss
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after entering a singleplayer world.
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- minecraft-1.21.4-fabric-iris-chocapic-v6-lite-in-world: captured from Minecraft 1.21.4 Fabric with Sodium, Iris, and
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Chocapic V6 Lite after entering a singleplayer world.
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- minecraft-1.21.4-fabric-iris-iterationt-in-world: captured from Minecraft 1.21.4 Fabric with Sodium, Iris, and
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iterationT after entering a singleplayer world.
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- minecraft-1.21.4-fabric-iris-iterationt-nodsa-in-world: captured from Minecraft 1.21.4 Fabric with Sodium, Iris, and
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iterationT after entering a singleplayer world, with Iris' DSA path disabled.
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- minecraft-1.21.4-fabric-iris-iterationrp-in-world: captured from Minecraft 1.21.4 Fabric with Sodium, Iris, and
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iterationRP after entering a singleplayer world, framing the iterationRP name overlay over a lake with far-shore
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tree reflections. iterationRP's temporal auto-exposure makes a single-frame trim overexpose and drop the overlay,
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so the fixture is a prefix trace (all calls up to the target frame) that replays the temporal state. The pack also
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gates an NVIDIA-only shadow path (`subgroupPartitionNV`, `GL_NV_shader_subgroup_partitioned`) on the GL vendor
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string, so the capture reports a masked vendor and the trace carries the portable `subgroupShuffleXor` path that
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non-NVIDIA GPUs take.
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The trace archive and golden are not committed yet (the repository's Git LFS quota rejects new objects with
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`GH009`); the case stays registered and its fixture files are hydrated from the trace fixture mirror.
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- minecraft-1.21.4-fabric-iris-photon-v1.1-in-world: captured from Minecraft 1.21.4 Fabric with Sodium, Iris, and
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Photon v1.1 after entering a singleplayer world.
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- minecraft-1.21.4-fabric-iris-photon-v1.3b-in-world: captured from Minecraft 1.21.4 Fabric with Sodium, Iris, and
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Photon v1.3b after entering a singleplayer world.
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- minecraft-1.21.4-fabric-iris-derivative-main-d24.4.14-in-world: captured from Minecraft 1.21.4 Fabric with Sodium,
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Iris, and Derivative Main d24.4.14 after entering a singleplayer world.
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- minecraft-1.21.4-fabric-iris-sundial-lite-in-world: captured from Minecraft 1.21.4 Fabric with Sodium, Iris, and
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Sundial Lite after entering a singleplayer world.
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- minecraft-1.21.1-neoforge-create-indirect-in-world: captured from Minecraft 1.21.1 NeoForge with Create, Sodium,
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and Iris (no shader pack) in a world facing Create water wheels and a large cogwheel, with Flywheel's
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`flywheel:indirect` backend (compute-shader culling, glMultiDrawElementsIndirect, persistent-mapped staging).
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- minecraft-1.21.1-neoforge-create-instancing-in-world: same world and camera as the indirect case, with Flywheel's
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`flywheel:instancing` backend (texture-buffer instance data, glDrawElementsInstancedBaseVertex).
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Build from the MobileGL repository root:
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```sh
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cmake -S . -B build-test -G Ninja \
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-DMOBILEGL_BUILD_TEST=ON \
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-DMOBILEGL_BUILD_BENCHMARK=OFF \
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-DMOBILEGL_BUILD_TRACE_REPLAY=ON
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cmake --build build-test
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```
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Run the fixture tests:
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```sh
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ctest --test-dir build-test -V -R 'MobileGLTraceReplay\.'
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```
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Run the CLI directly:
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```sh
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build-test/tools/trace_replay/mobilegl_trace_replay \
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--trace openra.trace \
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--golden openra.0000031249.png \
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--output out/openra \
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--backend DirectGLES \
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--mobilegl-library build-test/libMobileGL.so \
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--target-call 31249 \
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--width 640 \
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--height 480 \
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--crop-x 1 \
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--crop-y 1 \
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--crop-width 638 \
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--crop-height 478 \
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--ssim-threshold 0.99
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```
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## Dumping framebuffer attachments mid-frame
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`--target-call` snapshots one framebuffer. To see *inside* a frame - which
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intermediate render target a pass actually produced - pass
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`--dump-fbo-attachments CALL:DIR[:FBO,FBO,...]`, repeatably:
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```sh
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build-test/tools/trace_replay/mobilegl_trace_replay \
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--trace trace.trace --golden golden.png --output out --target-call 2667619 \
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--dump-fbo-attachments 2666231:out/fbos-before \
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--dump-fbo-attachments 2666232:out/fbos-after
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```
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At each call boundary it walks every live framebuffer object (or only the named
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ones), reads back every colour attachment and the depth attachment, and writes
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`fbo<N>-att<M>.png` / `fbo<N>-depth.png` plus a `manifest.txt` line per
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attachment recording the attached object, size, internal format, component type
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and per-channel min/max/mean and a content hash. Attachments are read as floats
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whatever their storage, so HDR accumulation buffers stay legible in the
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statistics even though the PNG has to clamp.
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The manifest is the useful part when comparing two drivers: dump the same call
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on both stacks and `diff`/`paste` the two manifests, and the first attachment
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whose hash differs names the pass that diverged. Read-side and pixel-pack state
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is saved and restored, so the replay continues unperturbed; without the flag
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nothing is installed and the replay is byte-for-byte what it was.
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Run the macOS native-window DirectVulkan retrace matrix and render the same
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HTML overview shape as CI:
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```sh
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cmake -S . -B cmake-build-macos-trace-arm64 -G Ninja \
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-DCMAKE_BUILD_TYPE=Release \
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-DCMAKE_OSX_ARCHITECTURES=arm64 \
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-DMOBILEGL_BUILD_TEST=OFF \
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-DMOBILEGL_BUILD_BENCHMARK=OFF \
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-DMOBILEGL_BUILD_TRACE_REPLAY=ON
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cmake --build cmake-build-macos-trace-arm64 --target MobileGL mobilegl_trace_replay
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python3 tools/trace_replay/run_macos_window_retrace_local.py --ci --all
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open .trace-work/macos-window-retrace-summary/mobilegl-macos-window-vulkan-retrace-overview.html
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```
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The macOS runner hydrates missing fixtures from the trace fixture mirror with
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parallel downloads before falling back to Git LFS. It reuses the
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`cmake-build-macos-trace-arm64` harness by default on Apple Silicon, passes
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`--window-surface`, and defaults to DirectVulkan only. If a native-window replay
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hits a fatal assertion, the runner writes a failure result and stops before
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launching later cases; use `--continue-after-fatal` to collect the full matrix,
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or `--skip-case NAME` for known fatal cases.
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## Android device replay
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Build and install the generic trace APK from the repository root. Both
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`DirectGLES` and `DirectVulkan` use the same APK and package; select the
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backend with the intent's `backend` extra.
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```sh
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gradle --no-daemon -p android-plugin :app:assembleTraceDebug
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TRACE_APK=$(find android-plugin/app/build/outputs/apk/trace/debug -maxdepth 1 -name '*.apk' -print -quit)
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adb install -r "$TRACE_APK"
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```
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Prepare a fixture and copy it into the app-private directory:
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```sh
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mkdir -p /tmp/mobilegl-openra
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tar -xzf tools/trace_replay/fixtures/openra.tgz -C /tmp/mobilegl-openra
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adb push /tmp/mobilegl-openra/openra.trace /data/local/tmp/mobilegl-openra.trace
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adb push tools/trace_replay/fixtures/openra.0000031249.png /data/local/tmp/mobilegl-openra.golden.png
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PKG=top.mobilegl.plugin.trace
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APP_DIR=/data/user/0/$PKG/files/trace-replay
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adb shell run-as $PKG rm -rf files/trace-replay
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adb shell run-as $PKG mkdir -p files/trace-replay/input files/trace-replay/output
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adb shell run-as $PKG cp /data/local/tmp/mobilegl-openra.trace files/trace-replay/input/openra.trace
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adb shell run-as $PKG cp /data/local/tmp/mobilegl-openra.golden.png files/trace-replay/input/openra.golden.png
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```
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Launch the standalone trace runner Activity:
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```sh
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adb shell am force-stop $PKG
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adb shell am start -W -a top.mobilegl.plugin.TRACE_REPLAY \
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-n $PKG/top.mobilegl.plugin.trace.TraceReplayActivity \
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--es trace_path $APP_DIR/input/openra.trace \
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--es golden_path $APP_DIR/input/openra.golden.png \
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--es output_dir $APP_DIR/output \
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--es diff_path $APP_DIR/output/openra-diff.png \
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--es backend DirectGLES \
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--el target_call 31249 \
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--ei width 640 \
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--ei height 480 \
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--ei crop_x 1 \
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--ei crop_y 1 \
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--ei crop_width 638 \
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--ei crop_height 478 \
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--es ssim_threshold 0.99
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```
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Read back the result and images:
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```sh
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adb shell run-as $PKG cat files/trace-replay/output/result.json
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adb exec-out run-as $PKG cat files/trace-replay/output/actual.png > openra-actual.png
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adb exec-out run-as $PKG cat files/trace-replay/output/openra-diff.png > openra-diff.png
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```
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For Vulkan replay, keep the same APK and `$PKG`, then pass
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`--es backend DirectVulkan`. DirectGLES also renders to the Activity surface by
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default; pass `--ez use_pbuffer true` to use the offscreen pbuffer path. Always
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`adb shell am force-stop $PKG` before another replay: apitrace snapshot state is
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process-local. For cases registered with `coherent_as_flush` (Flywheel-style
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unflushed persistent maps, e.g. the Create fixtures), pass
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`--ez coherent_as_flush true` so the replay runs with
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`MOBILEGL_COHERENT_AS_FLUSH=1`.
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## Reproducing the Android DirectGLES lane on Linux (ANGLE on lavapipe)
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The APK workflow's DirectGLES lane is not the same stack as the Linux one, which
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is why a case can be green here and red there:
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| lane | stack |
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| Linux `Test` retrace, DirectGLES | Espryt -> Mesa GLES -> llvmpipe |
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| Android `APK` retrace, DirectGLES | Espryt -> **ANGLE** -> Mesa Vulkan (lavapipe) |
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| Android `APK` retrace, DirectVulkan | Magma -> lavapipe (no ANGLE) |
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Only the Android DirectGLES lane puts ANGLE in the middle, so an ANGLE
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translation difference shows up in exactly one of the six combinations. That
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stack can be reproduced on Linux without an emulator, which is far faster to
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iterate on than a CI round trip. The Android emulator SDK ships a glibc ANGLE:
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```sh
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ANGLE=$ANDROID_SDK_ROOT/emulator/lib64/gles_angle
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mkdir -p ~/angle-farm && cd ~/angle-farm
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# MobileGL dlopens these two names; ANGLE's own libEGL then dlopens the
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# unsuffixed libGLESv2.so from the same directory - without that symlink it
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# loads a truncated entry-point table and dies on a missing EGL function.
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ln -sf $ANGLE/libEGL.so libEGL_angle.so
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ln -sf $ANGLE/libGLESv2.so libGLESv2_angle.so
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ln -sf $ANGLE/libEGL.so libEGL.so
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ln -sf $ANGLE/libGLESv2.so libGLESv2.so
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ln -sf $ANGLE/libvulkan.so.1 libvulkan.so.1 # else eglInitialize fails
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MOBILEGL_USE_ANGLE=1 \
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LD_LIBRARY_PATH=~/angle-farm:/path/to/build/ \
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VK_ICD_FILENAMES=/usr/share/vulkan/icd.d/lvp_icd.json \
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ANGLE_DEFAULT_PLATFORM=vulkan \
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./mobilegl_trace_replay --trace trace.trace --golden golden.png \
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--target-call N --width 854 --height 480 --backend DirectGLES \
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--output outdir --pbuffer-surface
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```
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`ANGLE_DEFAULT_PLATFORM=vulkan` is required: ANGLE otherwise picks its OpenGL
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backend and you get `ANGLE (Mesa, llvmpipe ..., OpenGL 4.6 (Core Profile))`
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instead of the CI-shaped `ANGLE (Mesa, Vulkan 1.x (llvmpipe ...))`. Check
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`MOBILEGL_TRACE_GL_RENDERER` in `outdir/retrace.log` before trusting a result.
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Run the binary directly rather than through `ctest`, whose `ENVIRONMENT`
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property overrides these variables. Build with clang, not gcc: gcc rejects
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`GLXImpl.cpp` under `-Wchanges-meaning`.
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### improved-transparency-minecraft-26.3 on the ANGLE lane
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This case has never passed on the Android DirectGLES lane. It renders correctly
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everywhere else, including Android DirectVulkan on the same emulator. The
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rendered frame loses the whole translucent layer - clouds and water are absent
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while opaque geometry is pixel-exact - so the compositing chain never receives
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the translucent content rather than blending it wrongly.
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**It is two defects in the ESSL we generate, and both are ours.** Replaying the
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fixture through the recipe above and through Mesa GLES, with a
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`MOBILEGL_LOG_LEVEL_DEBUG` build, gives SSIM 1.000000 on Mesa and 0.970127 on
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ANGLE while the *frontend* call stream is byte-identical - 2698222 calls, same
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names, same order, same arguments, the only difference being how often the app
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polls `glClientWaitSync`. That comparison is what misled the earlier
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investigation: it is the app-to-MobileGL direction. It says nothing about the
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GLES and ESSL MobileGL emits *downwards*, which is where the two lanes part.
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Two shaders that MobileGL generates fail to compile on ANGLE and link no
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program at all, so every draw that uses them is a silent no-op:
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| # | ANGLE compile error | what it is | what disappears |
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| --- | --- | --- | --- |
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| A | `0:2: 'GL_EXT_texture_buffer' : extension is not supported` then `'isamplerBuffer' : Illegal use of reserved word` | the cloud vertex shader emits `#extension GL_EXT_texture_buffer : require` and `uniform highp isamplerBuffer CloudFaces` unconditionally | clouds |
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| B | `'[' : array indexes for fragment outputs must be constant integral expressions` | the OIT coefficient fragment shader declares `layout(location = 0) out highp vec4 coeff[2];` and writes `coeff[attachmentIndex][i]` from a loop | the whole translucent accumulation |
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Neither is an ANGLE mistranslation:
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- **A is a capability gap we do not guard.** Minecraft 26.3 builds clouds
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entirely from `gl_VertexID` plus `texelFetch` on a buffer texture
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(`glTexBuffer(GL_TEXTURE_BUFFER, GL_R8I, ...)`). Mesa GLES advertises
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`GL_EXT_texture_buffer` and `GL_OES_texture_buffer`; the ANGLE in the local
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farm advertises neither (142 extensions against Mesa's 162), and MobileGL's
|
|
reported `GL_MAX_TEXTURE_BUFFER_SIZE` drops to the 65536 default because it
|
|
cannot query one. We emit the `require` line anyway.
|
|
- **B is a GLSL ES rule we violate.** Fragment output arrays must be indexed
|
|
with constant integral expressions; SPIRV-Cross hands us a loop-variable
|
|
index and Mesa's compiler accepts it, ANGLE does not. Any strict ES driver
|
|
rejects this shader, so it is not ANGLE-specific in principle - it is
|
|
Mesa's leniency that hides it on the Linux lane.
|
|
|
|
##### The local ANGLE is not the CI ANGLE - check before attributing
|
|
|
|
This trap cost a full round of analysis, so check it first. The Linux farm
|
|
recipe above uses the emulator SDK's ANGLE; the Android lane uses a *pinned*
|
|
build downloaded by `apk.yml` (`MOBILEGL_TRACE_ANGLE_VARIANT`, default
|
|
`ec889e6ea831`). They are far apart:
|
|
|
|
| | local farm ANGLE | CI lane ANGLE |
|
|
| --- | --- | --- |
|
|
| `GL_RENDERER` | `ANGLE (Mesa, Vulkan 1.4.354 (llvmpipe ...), llvmpipe-26.1.4)` | `ANGLE (Mesa, Vulkan 1.3.0 (llvmpipe ...), Mesa-25.2.4)` |
|
|
| extensions | 142 | 184 |
|
|
| `GL_EXT_texture_buffer` / `GL_OES_texture_buffer` | absent | **present**, `GL_MAX_TEXTURE_BUFFER_SIZE 134217728` |
|
|
| ES 3.2 core base vertex | no | yes |
|
|
|
|
So **defect A cannot be what fails on CI** - it is an artefact of the older
|
|
local ANGLE. The CI frame nevertheless loses clouds *and* water with the same
|
|
signature (`ssim=0.968845` against the local farm's 0.970127, opaque geometry
|
|
exact), and defect B is the remaining named cause: the coefficient writer is in
|
|
the OIT phase shader that *both* the cloud and the translucent-terrain
|
|
programs link against, so one rejected shader empties both layers.
|
|
|
|
That last step is **not yet directly confirmed on CI**, because the retrace APK
|
|
is built `-Pmobilegl.logLevel=MOBILEGL_LOG_LEVEL_INFO`, where `MGLOG_E` is
|
|
compiled out - the CI `mobilegl.log` carries 294 INFO lines and zero ERROR
|
|
lines, so the shader-compile diagnostics never reach the artifact. Confirming it
|
|
means replaying on an emulator with a debug-level trace APK and the pinned ANGLE
|
|
variant (`tools/trace_replay/run_android_retrace_local.py`), or promoting
|
|
shader-compile failures to a log level that survives an INFO build.
|
|
|
|
There is therefore **no honest harness accommodation**: no
|
|
`--avoid-angle-llvmpipe-*` flag can conjure a missing extension or make an
|
|
illegal shader legal, so the fixture stays red on the Android DirectGLES lane.
|
|
Fixing it means fixing the emitters - rewriting non-constant fragment-output
|
|
indexing into a switch over constant indices, and guarding the buffer-texture
|
|
`require` on driver support - which is shared backend work, not harness work.
|
|
|
|
Two earlier candidates remain correctly ruled out and should not be re-walked:
|
|
per-attachment blend equations are both recorded and applied correctly on ANGLE
|
|
(`glBlendEquationSeparatei` with GL_MAX on one attachment reads back as GL_MAX
|
|
and rasterizes as GL_MAX), and the GLES draw-buffer slot restriction is already
|
|
handled by `BackendFramebufferObject::RecomputeBackendColorSlots`.
|
|
|
|
#### Where in the frame it goes wrong
|
|
|
|
Snapshotting the same intra-frame call points on both stacks (`--target-call`,
|
|
ten replays in parallel, logs to `/dev/null`) localises it. SSIM against the
|
|
golden at each point:
|
|
|
|
| target call | what runs there | Mesa | ANGLE | gap |
|
|
| --- | --- | --- | --- | --- |
|
|
| 2667445 | last opaque draw, into FBO 29 | 0.146477 | 0.000195 | - |
|
|
| 2667488 | **OIT composite**: fullscreen triangle, program 50, into FBO 3 | 0.976448 | 0.945409 | 0.031 |
|
|
| 2667543 | post draw, program 56 | 0.985380 | 0.954480 | 0.031 |
|
|
| 2667595 | post draw, program 64 | 0.985685 | 0.954788 | 0.031 |
|
|
| 2667619 | golden point | 1.000000 | 0.970127 | 0.030 |
|
|
|
|
The gap opens at the composite and is then constant to four decimal places -
|
|
every pass after 2667488 contributes the same increment on both drivers. So
|
|
nothing downstream of the composite is implicated, and the GUI/post chain is
|
|
fine. The two stacks already disagree at 2667445, before the composite runs,
|
|
which points at the translucent accumulation targets the composite samples
|
|
rather than at the composite draw itself.
|
|
|
|
#### Which attachment, and which draw
|
|
|
|
`--dump-fbo-attachments` on both stacks pins it to a single draw. These numbers
|
|
are from the local farm, so the first divergence they show is defect A's cloud
|
|
draw; on CI, where clouds compile, the chain instead breaks one pass later at
|
|
the coefficient accumulation. Comparing the manifests at three call boundaries,
|
|
over all 30 live framebuffers:
|
|
|
|
| call | what has just run | verdict |
|
|
| --- | --- | --- |
|
|
| 2665649 | depth blit, before the translucent chain | every OIT target identical on both stacks |
|
|
| 2666231 | all entity/particle translucent draws done | still identical: FBO 21 att0 (texture 1554, RGBA32F) reads `c1 max=178.98 mean=1.81046` on Mesa against `179 / 1.8105` on ANGLE |
|
|
| 2666232 | the cloud draw - `glDrawElementsInstancedBaseVertex(count=221706)` with `GL_TEXTURE_BUFFER` bound | Mesa moves to `c1 max=1727.87 mean=70.2899`; **ANGLE does not move at all** |
|
|
|
|
At the golden point the same holds for the rest of the chain: texture 1555 (the
|
|
translucent colour accumulation) has mean 0.105617 on Mesa against 0.00403189 on
|
|
ANGLE, and texture 1556 (the alpha/coefficient target, FBO 26 attachment 1) is
|
|
alpha `max=1.34863 mean=0.261387` on Mesa and **identically zero** on ANGLE -
|
|
never written, because defect B linked no program for that pass. Everything
|
|
outside the translucent chain matches: the opaque terrain, the block atlas and
|
|
its mips, and the GUI targets differ only in the last float ULP.
|
|
|
|
So the earlier reading of the SSIM bisect was right about the location and wrong
|
|
about the cause. The composite at 2667488 is innocent; it faithfully composites
|
|
accumulation buffers that two failed shader compiles left empty.
|
|
|
|
Reproduce with:
|
|
|
|
```sh
|
|
for stack in mesa angle; do ... --target-call 2666232 \
|
|
--dump-fbo-attachments 2666232:out-$stack/fbos ; done
|
|
paste out-mesa/fbos/manifest.txt out-angle/fbos/manifest.txt
|
|
```
|
|
|
|
and read the compile errors straight out of `mobilegl.log`:
|
|
|
|
```sh
|
|
grep -aE 'Shader compilation failed|linking failed' out-angle/mobilegl.log
|
|
```
|