neuwirth
/
epiphany
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

T4 round 1 record: both candidates PASS, and the two carry-forwards that outlive the verdict 

The Round 1 result and the evidence it rests on: C1 and C2 each reproduce
all 27 precommitted sample points on both required adapters, 108 samples
in total, every one exactly opaque black or opaque white. Neither
candidate is eliminated at this rung.

Anchored to three SHAs, per pin 12 -- root baseline 0a35697, oracle
0a35697, candidate harness c20bc93. The authoritative run was made from a
detached worktree at the baseline with the harness extracted into it, so
the glyph outlines came from frozen epiphany-glyphs and not from a working
tree the parallel genesis-ops track has been editing throughout.

Two findings are recorded because they matter after this round is over.

A blank target is a silent pass shape and it actually happened here: C1
failed all 15 ink points while passing all 12 background points, which is
the signature of nothing being drawn rather than of a fill bug. Had this
round tested only background points, or only "renders without erroring",
a blank target would have passed it. Every later round needs at least one
assertion that can only succeed if ink was deposited.

And nominal 8x AA is not the same mechanism on both sides. Pin 4 asks for
an identical sample count and gets one, but C1's 8x is a hardware
multisample attachment while C2's is vello's compute AA into a
single-sample texture. Round 1 is indifferent; Round 4 is not, since AA is
in the deciding latency numbers, so the report prints the mechanism beside
the number rather than leaving "8 == 8" to imply parity.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RSX4zSLgKvtiXaPjnMqLGz
This commit is contained in:
Levi Neuwirth 2026-07-29 11:10:05 -04:00
parent c20bc93247
commit c10449a964
3 changed files with 308 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

124
spikes/editor-toolkit/DECISIONS.md
View File

@ -285,3 +285,127 @@ nothing.
`oracle.json` and `ORACLE_SUMMARY.md` are regenerated from the amended code `oracle.json` and `ORACLE_SUMMARY.md` are regenerated from the amended code
(`cargo run -p round1-oracle` from `spikes/editor-toolkit/round1-oracle/`). (`cargo run -p round1-oracle` from `spikes/editor-toolkit/round1-oracle/`).
## Round 1 — compound-path fill correctness (candidates)
**ROUND-1 RESULT: C1 PASS, C2 PASS.** Both candidates reproduce all 27
precommitted sample points on both required adapters — 54 samples each, 108
in total, every one landing exactly on `(0,0,0,255)` or `(255,255,255,255)`
with no antialiased near-miss anywhere. Neither candidate is eliminated at
this rung. Evidence: `round1-evidence/c1-egui-lyon-frozen-run.txt`,
`round1-evidence/c2-vello-frozen-run.txt`.
**The three SHAs this result is anchored to** (pin 12):
| | |
|---|---|
| Root baseline | `0a35697d8e48e65d62cd96c19eec2431e414359c` |
| Oracle commit | `0a35697d8e48e65d62cd96c19eec2431e414359c` |
| Candidate-harness commit | `c20bc93` |
The authoritative run was made from a detached `git worktree` at the root
baseline, with the candidate harness extracted into it from `c20bc93` via
`git archive`. So the `epiphany-glyphs` / `epiphany-layout-ir` code that
supplied every outline is the frozen baseline's, not the working tree's — the
parallel genesis-ops track has been editing `epiphany-core` and
`epiphany-ops` throughout, and a run against the live tree could not have
claimed a fixed subject. `oracle.json` hashes to
`b3fc017bdccb7e19feb44a1fde9f15d6e0e8d403cafcb9296eaadf21f3b5bb96` in the
worktree and in the working tree, unchanged since it was frozen.
**Both candidates draw the whole outline as one compound path** — C1 one
`lyon` `tessellate_path` over every contour, C2 one `BezPath` and one
`Scene::fill`. Filling subpath-by-subpath would paint every counter solid and
pass a test built to catch exactly that, so the single call is load-bearing,
not stylistic.
**C1 goes through egui's own paint pipeline, not a bare wgpu one.** Ruling A
names the candidate as "lyon-tessellated meshes inside egui"; rendering the
lyon mesh through a hand-rolled pipeline would test lyon and answer a
different question — the same failure shape as Round 0's iced side channel,
which read back cleanly while proving nothing about its subject. C1 builds a
real `epaint::ClippedPrimitive` and calls `Renderer::update_buffers` +
`Renderer::render`.
**Carry forward — a blank target is a silent pass shape, and it happened.**
C1's first run failed all 15 ink points while passing all 12 background
points. That pattern is not a fill defect; it is the signature of nothing
being drawn. The cause: the mesh named `TextureId::default()` (the font
atlas) without one being uploaded, and `egui-wgpu` skips primitives whose
texture id is unregistered — `if let Some(..) = self.textures.get(&mesh.texture_id)`
(`egui-wgpu-0.35.0/src/renderer.rs:542`), no error, no warning. C1 now
registers its own 1x1 opaque-white texture. **The general lesson matters more
than the fix:** had Round 1 tested only background points, or only "does it
render without erroring", a blank target would have passed. Every later round
must keep at least one assertion that can only succeed if ink was actually
deposited.
**Carry forward — nominal 8x AA is not the same mechanism on both sides.**
Pin 4 requires an identical MSAA sample count, and both candidates now declare
8x (an earlier C1 revision ran 4x against C2's 8x, which is not a common
configuration at all; vello's `AaConfig` offers only Area / Msaa8 / Msaa16, so
8x is the ceiling both can name). **The integers match; the mechanisms do
not.** C1's 8x is hardware multisampling — a `sample_count: 8` colour
attachment resolved by the GPU, which is why C1 must request
`TEXTURE_ADAPTER_SPECIFIC_FORMAT_FEATURES`: 8x on `Rgba8Unorm` is outside the
WebGPU baseline, which guarantees only `[1, 4]` for that format (both adapters
report `[1, 2, 4, 8]` with the feature enabled). C2's `Msaa8` is vello's own
compute-shader antialiasing writing into a `sample_count: 1` storage texture;
no multisample attachment exists on that side at all. Pin 4 is satisfied **as
stated** — same declared sample count — but equal integers do not imply equal
work, equal memory traffic, or equal cost. Round 1 is a capability rung and is
indifferent to the difference. **Round 4 is not**, because AA lands directly
in the deciding latency numbers, and "8 == 8" must not be allowed to stand in
for parity there. The run report prints the mechanism beside the number
(`msaa=8 (hardware MSAA render-target attachment, GPU-resolved)` vs
`msaa=8 (vello compute AA into a sample_count:1 storage texture)`) so the
record carries it without anyone having to remember.
**Format deviation, named.** Both candidates render to `Rgba8Unorm`, not the
sRGB target pin 4 names, because vello's `render_to_texture` requires
`Rgba8Unorm` + `STORAGE_BINDING`. Both are pinned to the same format for
fairness. Immaterial to fill correctness — only pure black and white are
drawn, and 0 and 255 map to themselves under any transfer function.
**Both adapter classes are enforced, not assumed.** Each binary checks for one
`DiscreteGpu` and one `IntegratedGpu` Vulkan adapter before it will report
overall PASS; a missing class returns `NOT RUN` naming the adapters actually
found, as an environment absence rather than a candidate failure. Reporting
PASS after testing whichever adapter happened to enumerate would silently
narrow the claim — and the integrated figure is the one that decides later
rungs.
**The harness errors rather than substituting.** Three readback failure modes
were all capable of turning a broken run green, and all three are now hard
errors: a short buffer previously yielded `(0,0,0,0)`, whose luma is 0, so it
classifies as *ink* and every ink point would have passed; `device_index`
clamped out-of-range coordinates to an edge pixel, which for a centred glyph
is always background, so a mis-transformed sample reported on a pixel the
oracle never named; and a non-opaque sample means the clear or the blend is
wrong, not that the candidate drew the wrong colour. Buffer length, coordinate
range, and sample opacity are all checked before any classification.
**The oracle is no longer editable into agreement.** `deny_unknown_fields` on
every deserialized type catches *structural* drift (serde ignores unknown
fields by default, so without it the "drift is a deserialization error" claim
this crate rests on was simply false). But semantic drift is the dangerous
kind, and the first `OracleFile::validate` checked the oracle against **its
own other fields** — each glyph's target against the *first glyph's* target,
each subpath count against the oracle's own `expected_subpath_count`. That
accepts any self-consistent file: deleting a glyph, renaming one, or resizing
every target together all validated cleanly. The validator now checks against
literals restated in the harness itself — the exact five-glyph roster with its
requirement mapping, subpath counts and point counts, the 27-point census,
1920x1080, an 8 px clearance floor and every individual sample's clearance,
`ink_satisfied`, the relaxed-spacing flags, and the requirement-specific
status flags. Bounded-hole evidence must be unfilled under **both** rules, not
just even-odd, since that agreement is the measured fact criterion 1 rests on.
Thirteen mutations were run against it and all thirteen are rejected: deleting
`noteheadHalf`; renaming `gClef`; duplicating a glyph over another; dropping
one sample point; retargeting every glyph to 3840x2160 together; lowering the
declared clearance floor to 2; setting one sample's clearance to 3 px;
clearing `ink_satisfied`; setting `ink_spacing_relaxed`; swapping `fClef`'s
requirement class; changing `gClef`'s subpath count in both fields at once;
marking hole evidence `nonzero_filled`; and declaring `round2`. The oracle was
restored by reversal after each and re-hashes to `b3fc017b...`.

93
spikes/editor-toolkit/round1-evidence/c1-egui-lyon-frozen-run.txt Normal file
View File

@ -0,0 +1,93 @@
=== C1 egui 0.35 + lyon 1.0 (egui_wgpu::Renderer) on AMD Radeon RX 7900 XTX (RADV NAVI31) (DiscreteGpu) [backend=Vulkan, vendor=0x1002, device=0x744c] ===
msaa=8 (hardware MSAA render-target attachment, GPU-resolved) format=Rgba8Unorm luminance_threshold<128 fill_rule=NonZero
--- gClef (6/6 points PASS) ---
idx class subpath device(x,y) rgba verdict
0 Ink - ( 919.80, 820.20) ( 0, 0, 0,255) PASS
1 Ink - ( 910.80, 833.20) ( 0, 0, 0,255) PASS
2 Ink - ( 952.80, 439.20) ( 0, 0, 0,255) PASS
3 Background - ( 1001.80, 302.20) (255,255,255,255) PASS
4 Background - ( 995.80, 316.20) (255,255,255,255) PASS
5 Background - ( 1007.80, 287.20) (255,255,255,255) PASS
--- timeSig8 (6/6 points PASS) ---
idx class subpath device(x,y) rgba verdict
0 Ink - ( 1005.80, 559.60) ( 0, 0, 0,255) PASS
1 Ink - ( 984.80, 544.60) ( 0, 0, 0,255) PASS
2 Ink - ( 968.80, 538.60) ( 0, 0, 0,255) PASS
3 Background - ( 941.80, 593.60) (255,255,255,255) PASS
4 Background - ( 956.80, 598.60) (255,255,255,255) PASS
5 Background - ( 972.80, 480.60) (255,255,255,255) PASS
--- accidentalFlat (6/6 points PASS) ---
idx class subpath device(x,y) rgba verdict
0 Ink - ( 989.80, 561.80) ( 0, 0, 0,255) PASS
1 Ink - ( 990.80, 577.80) ( 0, 0, 0,255) PASS
2 Ink - ( 929.80, 554.80) ( 0, 0, 0,255) PASS
3 Background - ( 954.80, 580.80) (255,255,255,255) PASS
4 Background - ( 951.80, 595.80) (255,255,255,255) PASS
5 Background - ( 960.80, 566.80) (255,255,255,255) PASS
--- noteheadHalf (6/6 points PASS) ---
idx class subpath device(x,y) rgba verdict
0 Ink - ( 941.00, 512.00) ( 0, 0, 0,255) PASS
1 Ink - ( 977.00, 569.00) ( 0, 0, 0,255) PASS
2 Ink - ( 990.00, 560.00) ( 0, 0, 0,255) PASS
3 Background - ( 960.00, 540.00) (255,255,255,255) PASS
4 Background - ( 947.00, 548.00) (255,255,255,255) PASS
5 Background - ( 973.00, 532.00) (255,255,255,255) PASS
--- fClef (3/3 points PASS) ---
idx class subpath device(x,y) rgba verdict
0 Ink 0 ( 874.20, 467.40) ( 0, 0, 0,255) PASS
1 Ink 1 ( 1075.80, 415.40) ( 0, 0, 0,255) PASS
2 Ink 2 ( 1076.60, 515.00) ( 0, 0, 0,255) PASS
notes:
- Rendered through egui's own paint pipeline (egui_wgpu::Renderer::update_buffers + ::render) with an epaint::Mesh, NOT a hand-rolled wgpu pipeline — the stack under test is the real one.
- Whole outline tessellated as ONE compound lyon path in one tessellate_path call.
- Format deviation: Rgba8Unorm, not sRGB, to match C2 (vello requires it).
- AA is nominally 8x on both candidates — the highest sample count both name, so pin 4's identical-configuration requirement is met as stated. The mechanisms are NOT the same: this is a hardware multisample render-target attachment (hence the TEXTURE_ADAPTER_SPECIFIC_FORMAT_FEATURES request), while C2 uses vello's compute-shader AA into a sample_count:1 storage texture. Matching integers do not imply matching work or matching cost; this is immaterial to Round 1's capability verdict and material to Round 4's timings.
RESULT AMD Radeon RX 7900 XTX (RADV NAVI31) :: 27/27 points PASS
=== C1 egui 0.35 + lyon 1.0 (egui_wgpu::Renderer) on AMD Ryzen 7 9800X3D 8-Core Processor (RADV RAPHAEL_MENDOCINO) (IntegratedGpu) [backend=Vulkan, vendor=0x1002, device=0x13c0] ===
msaa=8 (hardware MSAA render-target attachment, GPU-resolved) format=Rgba8Unorm luminance_threshold<128 fill_rule=NonZero
--- gClef (6/6 points PASS) ---
idx class subpath device(x,y) rgba verdict
0 Ink - ( 919.80, 820.20) ( 0, 0, 0,255) PASS
1 Ink - ( 910.80, 833.20) ( 0, 0, 0,255) PASS
2 Ink - ( 952.80, 439.20) ( 0, 0, 0,255) PASS
3 Background - ( 1001.80, 302.20) (255,255,255,255) PASS
4 Background - ( 995.80, 316.20) (255,255,255,255) PASS
5 Background - ( 1007.80, 287.20) (255,255,255,255) PASS
--- timeSig8 (6/6 points PASS) ---
idx class subpath device(x,y) rgba verdict
0 Ink - ( 1005.80, 559.60) ( 0, 0, 0,255) PASS
1 Ink - ( 984.80, 544.60) ( 0, 0, 0,255) PASS
2 Ink - ( 968.80, 538.60) ( 0, 0, 0,255) PASS
3 Background - ( 941.80, 593.60) (255,255,255,255) PASS
4 Background - ( 956.80, 598.60) (255,255,255,255) PASS
5 Background - ( 972.80, 480.60) (255,255,255,255) PASS
--- accidentalFlat (6/6 points PASS) ---
idx class subpath device(x,y) rgba verdict
0 Ink - ( 989.80, 561.80) ( 0, 0, 0,255) PASS
1 Ink - ( 990.80, 577.80) ( 0, 0, 0,255) PASS
2 Ink - ( 929.80, 554.80) ( 0, 0, 0,255) PASS
3 Background - ( 954.80, 580.80) (255,255,255,255) PASS
4 Background - ( 951.80, 595.80) (255,255,255,255) PASS
5 Background - ( 960.80, 566.80) (255,255,255,255) PASS
--- noteheadHalf (6/6 points PASS) ---
idx class subpath device(x,y) rgba verdict
0 Ink - ( 941.00, 512.00) ( 0, 0, 0,255) PASS
1 Ink - ( 977.00, 569.00) ( 0, 0, 0,255) PASS
2 Ink - ( 990.00, 560.00) ( 0, 0, 0,255) PASS
3 Background - ( 960.00, 540.00) (255,255,255,255) PASS
4 Background - ( 947.00, 548.00) (255,255,255,255) PASS
5 Background - ( 973.00, 532.00) (255,255,255,255) PASS
--- fClef (3/3 points PASS) ---
idx class subpath device(x,y) rgba verdict
0 Ink 0 ( 874.20, 467.40) ( 0, 0, 0,255) PASS
1 Ink 1 ( 1075.80, 415.40) ( 0, 0, 0,255) PASS
2 Ink 2 ( 1076.60, 515.00) ( 0, 0, 0,255) PASS
notes:
- Rendered through egui's own paint pipeline (egui_wgpu::Renderer::update_buffers + ::render) with an epaint::Mesh, NOT a hand-rolled wgpu pipeline — the stack under test is the real one.
- Whole outline tessellated as ONE compound lyon path in one tessellate_path call.
- Format deviation: Rgba8Unorm, not sRGB, to match C2 (vello requires it).
- AA is nominally 8x on both candidates — the highest sample count both name, so pin 4's identical-configuration requirement is met as stated. The mechanisms are NOT the same: this is a hardware multisample render-target attachment (hence the TEXTURE_ADAPTER_SPECIFIC_FORMAT_FEATURES request), while C2 uses vello's compute-shader AA into a sample_count:1 storage texture. Matching integers do not imply matching work or matching cost; this is immaterial to Round 1's capability verdict and material to Round 4's timings.
RESULT AMD Ryzen 7 9800X3D 8-Core Processor (RADV RAPHAEL_MENDOCINO) :: 27/27 points PASS
C1 egui+lyon: PASS on all 2 adapter(s)

91
spikes/editor-toolkit/round1-evidence/c2-vello-frozen-run.txt Normal file
View File

@ -0,0 +1,91 @@
=== C2 vello 0.9 + kurbo on AMD Radeon RX 7900 XTX (RADV NAVI31) (DiscreteGpu) [backend=Vulkan, vendor=0x1002, device=0x744c] ===
msaa=8 (vello compute AA into a sample_count:1 storage texture) format=Rgba8Unorm luminance_threshold<128 fill_rule=NonZero
--- gClef (6/6 points PASS) ---
idx class subpath device(x,y) rgba verdict
0 Ink - ( 919.80, 820.20) ( 0, 0, 0,255) PASS
1 Ink - ( 910.80, 833.20) ( 0, 0, 0,255) PASS
2 Ink - ( 952.80, 439.20) ( 0, 0, 0,255) PASS
3 Background - ( 1001.80, 302.20) (255,255,255,255) PASS
4 Background - ( 995.80, 316.20) (255,255,255,255) PASS
5 Background - ( 1007.80, 287.20) (255,255,255,255) PASS
--- timeSig8 (6/6 points PASS) ---
idx class subpath device(x,y) rgba verdict
0 Ink - ( 1005.80, 559.60) ( 0, 0, 0,255) PASS
1 Ink - ( 984.80, 544.60) ( 0, 0, 0,255) PASS
2 Ink - ( 968.80, 538.60) ( 0, 0, 0,255) PASS
3 Background - ( 941.80, 593.60) (255,255,255,255) PASS
4 Background - ( 956.80, 598.60) (255,255,255,255) PASS
5 Background - ( 972.80, 480.60) (255,255,255,255) PASS
--- accidentalFlat (6/6 points PASS) ---
idx class subpath device(x,y) rgba verdict
0 Ink - ( 989.80, 561.80) ( 0, 0, 0,255) PASS
1 Ink - ( 990.80, 577.80) ( 0, 0, 0,255) PASS
2 Ink - ( 929.80, 554.80) ( 0, 0, 0,255) PASS
3 Background - ( 954.80, 580.80) (255,255,255,255) PASS
4 Background - ( 951.80, 595.80) (255,255,255,255) PASS
5 Background - ( 960.80, 566.80) (255,255,255,255) PASS
--- noteheadHalf (6/6 points PASS) ---
idx class subpath device(x,y) rgba verdict
0 Ink - ( 941.00, 512.00) ( 0, 0, 0,255) PASS
1 Ink - ( 977.00, 569.00) ( 0, 0, 0,255) PASS
2 Ink - ( 990.00, 560.00) ( 0, 0, 0,255) PASS
3 Background - ( 960.00, 540.00) (255,255,255,255) PASS
4 Background - ( 947.00, 548.00) (255,255,255,255) PASS
5 Background - ( 973.00, 532.00) (255,255,255,255) PASS
--- fClef (3/3 points PASS) ---
idx class subpath device(x,y) rgba verdict
0 Ink 0 ( 874.20, 467.40) ( 0, 0, 0,255) PASS
1 Ink 1 ( 1075.80, 415.40) ( 0, 0, 0,255) PASS
2 Ink 2 ( 1076.60, 515.00) ( 0, 0, 0,255) PASS
notes:
- AA is nominally 8x on both candidates — the highest sample count both name, so pin 4's identical-configuration requirement is met as stated. The mechanisms are NOT the same: C1 uses a hardware multisample render-target attachment (hence its TEXTURE_ADAPTER_SPECIFIC_FORMAT_FEATURES request), C2 uses vello's compute-shader AA into a sample_count:1 storage texture. Matching integers do not imply matching work or matching cost; this is immaterial to Round 1's capability verdict and material to Round 4's timings.
- Format deviation: Rgba8Unorm, not sRGB — vello's render_to_texture requires Rgba8Unorm + STORAGE_BINDING. Both candidates pinned to it for fairness; immaterial to fill correctness since only pure black/white are drawn.
- Whole outline filled as ONE compound BezPath in one Scene::fill call.
RESULT AMD Radeon RX 7900 XTX (RADV NAVI31) :: 27/27 points PASS
=== C2 vello 0.9 + kurbo on AMD Ryzen 7 9800X3D 8-Core Processor (RADV RAPHAEL_MENDOCINO) (IntegratedGpu) [backend=Vulkan, vendor=0x1002, device=0x13c0] ===
msaa=8 (vello compute AA into a sample_count:1 storage texture) format=Rgba8Unorm luminance_threshold<128 fill_rule=NonZero
--- gClef (6/6 points PASS) ---
idx class subpath device(x,y) rgba verdict
0 Ink - ( 919.80, 820.20) ( 0, 0, 0,255) PASS
1 Ink - ( 910.80, 833.20) ( 0, 0, 0,255) PASS
2 Ink - ( 952.80, 439.20) ( 0, 0, 0,255) PASS
3 Background - ( 1001.80, 302.20) (255,255,255,255) PASS
4 Background - ( 995.80, 316.20) (255,255,255,255) PASS
5 Background - ( 1007.80, 287.20) (255,255,255,255) PASS
--- timeSig8 (6/6 points PASS) ---
idx class subpath device(x,y) rgba verdict
0 Ink - ( 1005.80, 559.60) ( 0, 0, 0,255) PASS
1 Ink - ( 984.80, 544.60) ( 0, 0, 0,255) PASS
2 Ink - ( 968.80, 538.60) ( 0, 0, 0,255) PASS
3 Background - ( 941.80, 593.60) (255,255,255,255) PASS
4 Background - ( 956.80, 598.60) (255,255,255,255) PASS
5 Background - ( 972.80, 480.60) (255,255,255,255) PASS
--- accidentalFlat (6/6 points PASS) ---
idx class subpath device(x,y) rgba verdict
0 Ink - ( 989.80, 561.80) ( 0, 0, 0,255) PASS
1 Ink - ( 990.80, 577.80) ( 0, 0, 0,255) PASS
2 Ink - ( 929.80, 554.80) ( 0, 0, 0,255) PASS
3 Background - ( 954.80, 580.80) (255,255,255,255) PASS
4 Background - ( 951.80, 595.80) (255,255,255,255) PASS
5 Background - ( 960.80, 566.80) (255,255,255,255) PASS
--- noteheadHalf (6/6 points PASS) ---
idx class subpath device(x,y) rgba verdict
0 Ink - ( 941.00, 512.00) ( 0, 0, 0,255) PASS
1 Ink - ( 977.00, 569.00) ( 0, 0, 0,255) PASS
2 Ink - ( 990.00, 560.00) ( 0, 0, 0,255) PASS
3 Background - ( 960.00, 540.00) (255,255,255,255) PASS
4 Background - ( 947.00, 548.00) (255,255,255,255) PASS
5 Background - ( 973.00, 532.00) (255,255,255,255) PASS
--- fClef (3/3 points PASS) ---
idx class subpath device(x,y) rgba verdict
0 Ink 0 ( 874.20, 467.40) ( 0, 0, 0,255) PASS
1 Ink 1 ( 1075.80, 415.40) ( 0, 0, 0,255) PASS
2 Ink 2 ( 1076.60, 515.00) ( 0, 0, 0,255) PASS
notes:
- AA is nominally 8x on both candidates — the highest sample count both name, so pin 4's identical-configuration requirement is met as stated. The mechanisms are NOT the same: C1 uses a hardware multisample render-target attachment (hence its TEXTURE_ADAPTER_SPECIFIC_FORMAT_FEATURES request), C2 uses vello's compute-shader AA into a sample_count:1 storage texture. Matching integers do not imply matching work or matching cost; this is immaterial to Round 1's capability verdict and material to Round 4's timings.
- Format deviation: Rgba8Unorm, not sRGB — vello's render_to_texture requires Rgba8Unorm + STORAGE_BINDING. Both candidates pinned to it for fairness; immaterial to fill correctness since only pure black/white are drawn.
- Whole outline filled as ONE compound BezPath in one Scene::fill call.
RESULT AMD Ryzen 7 9800X3D 8-Core Processor (RADV RAPHAEL_MENDOCINO) :: 27/27 points PASS
C2 vello: PASS on all 2 adapter(s)