Breed evidence within the 6 GB ceiling; TAA keeps a stochastic coat's history at a moving silhouette by drsnuggles8 · Pull Request #1638 · drsnuggles8/OloEngineBase

drsnuggles8 · 2026-10-18T22:27:44Z

Closes #1608. Closes #1627. Closes #1607.

#1608: the breed evidence suite runs within the 6 GB per-process ceiling

Breeds/BreedShowcaseEvidenceTest.* died mid-Bernese at 6510 MB (exit 77) and needed --olo-rss-ceiling-mb=0. It now passes all 22 cases at the default ceiling, and the largest peak is 4433 MB (Samoyed packed-path case). Attributed with an outside per-case working-set sampler, then working-set probes around the suspect creation. The editor pays every one of these costs too.

The groom rest stream is GL immutable storage. VertexBuffer::Create(data, size) is glNamedBufferData, and NVIDIA keeps a resident system-memory copy of every mutable buffer. On the Bernese that copy was 1.5 GB of working set on top of VRAM. New VertexBuffer::CreateImmutable / IndexBuffer::CreateImmutable use flags-0 glNamedBufferStorage (measured: even GL_DYNAMIC_STORAGE_BIT brings the copy back); on Vulkan they are plain Create. The groom's write-once buffers use them. Vertex upload: 1538 MB → 20 MB of working set.
A bound coat's rest stream is streamed to the GPU in chunks. Built whole, the Samoyed's 2 GB of ribbon vertices sat beside its indices and caster order until the upload finished, a 2.6 GB spike on every first draw. BuildGroomStrandRestMeshStreamed (one walk shared with BuildGroomStrandRestMesh) hands 16 MiB chunks to ImmutableVertexBufferUpload:
- GL: flags-0 storage filled by copies from two alternating staging buffers, with every step checked for a GL error.
- Vulkan: a memcpy into a fresh mapped buffer, or ordered uploads when it isn't mapped.
What the pass used to read back off the vertices (caster segment lengths and radii, bind-frame boxes, reach) the walk records with the same arithmetic. A refused upload is logged once, remembered per stream, and the coat falls back to the CPU path.
The loose/packed test case scopes its coat copies. It held five copies of the coat until it returned.

Case (default ceiling)	before	after
resolve B6, Bernese	7394 MB	3469 MB
loose/packed, Samoyed	6154 MB (exit 77)	4433 MB
hero angles, Samoyed	n/a (died earlier)	3717 MB
card hand-over (cards/strands)	needed ceiling off	coverage 0.971–1.002, energy 0.964–1.021 (bar ±5%)

#1627: TAA keeps a stochastic coat's history at a moving silhouette

Decided in the session: fix it in the engine, not with a different bar. A/B arms on PostProcess_TAA.glsl (table in temporal-coverage-means-not-samples.md) found two causes. Borrowing coat history where the previous frame had none, the issue's first idea, measured as nothing, because true disocclusion is rare there.

The coverage term misfired at moving silhouettes. The 8x8 window is reprojected by the coat's mean velocity, but the opaque lawn and body beside the coat move on their own. With a stochastic coat in the window, the mean now sums only estimator texels (marked or fractional) and leaves out opaque 0/1 texels. A real step still registers, whether it's the coat's or an alpha-tested leaf's.
The clip box was one draw's 3x3. A stochastic coat pixel now builds its box from 5x5 at gamma 1.0.

Bernese walk from behind (ratio of resolved to no-history instability; bar 0.5): face 0.648 → 0.492, ears 0.545 → 0.481, fringe 0.530 → 0.458. All four walk views improve, and lag rises 0.06–0.09 (worst 0.597, ceiling 0.8). The rear and front strips show no trails against the base shader. The still hair's gain goes 11.9× → 12.7×; under upscale Quality 7.1× → 11.0× and Performance 4.3× → 8.0×. A coverage halving is 0.49 stale one frame later (was 0.51). All 41 TemporalSubject, LongSequence, Reconstruction and FoxCoat cases pass.

#1607

Already fixed on master by #1626. Confirmed: compensation off 13580 / on 14812 / every strand 16162 coat px. The gap closes to 0.52 of what thinning removed (bar 0.7), and coverage reaches 0.92× of the full coat (bar 1.05×). Evidence is on the issue.

Found and fixed

Resource inspector: buffer previews mapped with glMapBuffer(GL_READ_ONLY), which fails on immutable storage without GL_MAP_READ_BIT, so those buffers previewed as nothing. They're now read with glGetNamedBufferSubData (own commit).
AcquireRestStream: a prepared streaming geometry that didn't match the request still supplied its vertices, indices and caster strands to a fresh build's stats.
OpenGLVertexBuffer::SetData on storage without GL_DYNAMIC_STORAGE_BIT used to fail as a silent GL error. It now asserts and logs.
Two comments claimed Create(data, size) was already immutable; corrected.

Verification

Axis	Cell	Evidence
Memory ceiling	default 6 GB, full breed suite	22/22 pass, peak 4433 MB (artefact: sampler log)
Breed	Bernese, Samoyed	every case both breeds
Build	Release, Debug	both compile; new tests pass in both
Render path	Forward (all the breed cases run)	suite; TemporalSubject covers Forward, Forward+, Deferred, MSAA 4x, upscale, non-native resolution
GL	live editor, Bernese in Play	coat drawn, no errors (screenshots after the review fixes)
Vulkan	live editor (`[RHI] Backend: Vulkan`)	coat drawn through the Vulkan upload arm, no errors or VUIDs; TAA fragment compiles with glslc for vulkan1.2 and opengl4.5
#1607	GL Release	pass, numbers above

New tests: ImmutableBufferStorageTest (flags-0 storage, data, the mutable control, the inspector read, chunked upload and its refusals) and GroomGpuDeformation.AStreamedRestBuild* (streamed stream and measures equal the whole build bit for bit at four chunk sizes; refusals build nothing). Evidence PNGs are not committed (#1610).

🤖 Generated with Claude Code

Summary by CodeRabbit

Improvements
- Temporal anti-aliasing handles partially covered and stochastic pixels more consistently, reducing artifacts around moving silhouettes.
- Groom strand geometry uploads in chunks, reducing CPU memory use during rendering.
- Immutable GPU buffers support write-once uploads, and buffer readbacks validate requested ranges more reliably.
Tests
- Added coverage for streamed groom geometry, immutable GPU buffers, and buffer readbacks.

VertexBuffer::Create(data, size) and IndexBuffer::Create are mutable storage on GL (glNamedBufferData), and the NVIDIA driver keeps a resident system-memory copy of every mutable buffer. The Bernese coat's groom rest stream is 1.5 GB of ribbon vertices, so it cost 1.5 GB of working set on top of its VRAM, and BreedShowcaseEvidenceTest crossed the test binary's 6 GB per-process ceiling (peak 7.4 GB, exit 77). The editor carried the same copy. Add VertexBuffer::CreateImmutable / IndexBuffer::CreateImmutable: glNamedBufferStorage with no flags on GL (even GL_DYNAMIC_STORAGE_BIT brings the copy back, measured), Create on Vulkan, whose buffers are device-local already. The groom pass's write-once buffers use them: the rest stream's vertices and indices, the caster order's indices, and an undeformed coat's stream. SetData on a GL vertex buffer without dynamic storage now asserts and logs instead of failing as a silent GL error. Measured on the Bernese hero-angle case: the vertex upload adds 20 MB of working set instead of 1538 MB, peak 4770 -> 3299 MB, steady 4170 -> 2680 MB, every printed measurement identical. Two comments that said Create(data, size) was already immutable are corrected. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

ReadBufferRange bound the buffer and called glMapBuffer(GL_READ_ONLY), which fails on immutable storage created without GL_MAP_READ_BIT, so the inspector previewed every such buffer as nothing (the storage-flag vertex buffers, storage buffers with no map bits, and now every CreateImmutable buffer). Read with glGetNamedBufferSubData, which works on any storage and needs no bind; the range check stays in front of it. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

TheShippedCoatAndBindingSurviveTheLooseAndPackedPaths held the shipped bytes, a re-encoded copy, a recooked binding, the loose import, the packed import and the pack's manager until it returned, each a whole coat, and then swapped the scene to the packed pair, which builds a second rest stream. On the Samoyed that crossed the 6 GB per-process ceiling (6154 MB, exit 77) once the groom fix let the suite reach it. Each stage now lives in its own scope and the loose pair leaves the asset manager once the pack is written: peak 6154 -> 5772 MB (Samoyed), 5045 -> 4949 MB (Bernese), the checks and the printed pixel counts unchanged. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

…1608) The rest stream was built whole on the CPU, 64 bytes a ribbon corner, and held beside its indices and caster order until the upload finished: 2 GB of vertices for the Samoyed's two million strands, a 2.6 GB working-set spike every time a coat was first drawn, in the editor as in the tests. It kept the breed suite's packed-path case at 5.77 GB of the 6 GB per-process ceiling. BuildGroomStrandRestMeshStreamed walks the coat exactly as BuildGroomStrandRestMesh does (one shared walk) and hands the vertices to a sink in whole-quad chunks of 16 MiB. ImmutableVertexBufferUpload fills the write-once buffer from them: GL immutable storage with no flags, filled by copies from a one-chunk staging buffer; Vulkan ordered uploads into a device-local buffer. What the pass used to read back off the whole stream -- the caster order's segment lengths and radii, each strand's bind-frame box, the reach and widest radius -- the walk records instead, with the readers' own arithmetic; BuildGroomCasterOrder gains a per-segment form. Every refusal (sink, upload, size) is logged and the coat falls back to the CPU path rather than drawing a short stream. Pinned bit-for-bit against the whole build at four chunk sizes and two budgets. Measured, default ceiling: packed-path case 5772 -> 4284 MB (Samoyed) and 4949 -> 3530 MB (Bernese); eyes case 4614 -> 3761 MB; the printed pixel counts unchanged. Also fixed on the way: a prepared streaming geometry that did not match the request (another binding or groom) was dropped for the fresh build's stats but its vertices, indices and caster strands were still the ones uploaded. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

…med (#1608) A mutable GL buffer keeps a resident system-memory copy of itself on NVIDIA, the renderer memory report does not show it, and a coat-sized buffer built whole on the CPU spikes the working set by its size while it uploads. How it was attributed (an outside working-set sampler tagged by gtest case, plus UsedPhysical probes around the creation) is written down too. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

) On the Bernese walk from behind, the resolve did not halve what two draws of the same frames differ by on the face, ears and fringe (0.648, 0.545, 0.530 against a 0.5 bar). A/B arms on the shader (doc table) found two causes: - The coverage term compared 8x8 coverage means. The window is reprojected by the coat's mean velocity, so the coat holds still in it, but the lawn and body beside it move by their own, and at a moving silhouette that moved the mean past the dead band with no change to the coat. A stochastic coat now compares its own share (coverage of marked texels, over all 64). A real step still moves it; TemporalSubjectSequence reads the same to the digit. - The clip box came from one draw's 3x3, itself a draw. A stochastic coat pixel now builds it from 5x5 at gamma 1.0. Walk from behind: face 0.492, ears 0.481, fringe 0.458, tail 0.405, body 0.422, lag 0.25 -> 0.32 (ceiling 0.8); no trail in the strip's frames. The still hair's gain 11.9x -> 12.7x, under upscale 7.1x -> 11.0x (Quality) and 4.3x -> 8.0x (Performance); a coverage halving 0.49 stale a frame on (0.51), 0.31 after four (0.29). The 41 TemporalSubject/LongSequence/Reconstruction and FoxCoat cases pass. Borrowing coat history where the previous frame had none, the issue's first idea, moved nothing: true disocclusion is rare here. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

…1608) Self-review of the streamed upload: - GL: the destination's storage is checked after allocation and every chunk's write and copy for a GL error, so an out-of-memory buffer fails the build loudly instead of drawing an empty stream. Two staging buffers in turn, so a chunk's write does not wait on the last chunk's copy. - Vulkan: a fresh, host-mapped buffer takes each chunk by memcpy (WriteBeforeFirstUse), so a BAR-mapped ribbon is never staged whole; an unmapped one still stages per chunk. - A refused stream is remembered per key and said once: the walk and the upload are no longer repeated on every acquire. The walk stops building once the sink refuses. - Streaming records the upload's own time and resident bytes: not the walk's time, not the staging buffers, which are booked to their own owner. - The local boxes are passed as a span; the reach is one helper for both the prepared and the streamed path. - The inspector clears GL errors left by earlier calls before its read. ImmutableBufferStorageTest pins the chunked upload: three uneven chunks read back intact in flags-0 storage; a short, overlong or over-chunk upload builds nothing. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Self-review: comparing only the stochastic coat's share of the 8x8 mean hid a real coverage step of another estimator sharing the window, such as an alpha-tested leaf beside the dog. The mean now sums every texel that holds the mark or a fractional coverage and leaves out only an opaque surface's 1 and an empty texel's 0, which is what moved at the silhouette. The walk from behind and TemporalSubjectSequence read the same to the digit. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

#1627) Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

coderabbitai · 2026-10-18T22:29:33Z

No actionable comments were generated in the recent review. 🎉

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docs/agent-rules/temporal-coverage-means-not-samples.md

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📝 Walkthrough

The PR changes TAA coverage estimation and clipping. It also adds streamed groom rest-mesh construction, immutable GPU buffer upload paths, render-pass integration, related tests, and documentation.

Changes: Streamed Groom Rest Meshes

Layer / File(s)	Summary
Streamed mesh construction and caster measurements `OloEngine/src/OloEngine/Groom/GroomCasterPose.h`, `OloEngine/src/OloEngine/Groom/GroomStrandMesh.h`, `OloEngine/src/OloEngine/Groom/GroomStrandMesh.cpp`	A shared rest-mesh builder supports in-memory output and chunked sink output. It collects caster segments, local boxes, and reach and radius measures. Caster ordering accepts vertex data or precomputed segment measurements.
Immutable and chunked buffer uploads `OloEngine/src/OloEngine/Renderer/VertexBuffer.`, `OloEngine/src/OloEngine/Renderer/IndexBuffer.`, `OloEngine/src/Platform/OpenGL/OpenGLVertexBuffer.`, `OloEngine/src/Platform/OpenGL/OpenGLResourceInspectorBackend.cpp`, `OloEngine/src/Platform/Vulkan/VulkanBufferResources.`	Immutable buffer factories and a chunked vertex uploader support OpenGL and Vulkan. OpenGL vertex buffers track refillability, and inspector reads use named-buffer readback.
Groom render-pass streaming integration `OloEngine/src/OloEngine/Renderer/Passes/GroomRenderPass.*`	The render pass streams rest vertices into immutable buffers and uses collected measurements for bounds and caster construction. It records upload and resident-byte measurements and remembers refused stream keys. Deformed vertices remain mutable.
Stream and buffer validation `OloEngine/tests/Groom/GroomGpuDeformationTest.cpp`, `OloEngine/tests/Rendering/ImmutableBufferStorageTest.cpp`, `OloEngine/tests/Rendering/PropertyTests/DogShowcaseEvidenceTest.cpp`, `OloEngine/tests/CMakeLists.txt`, `docs/agent-rules/README.md`, `docs/agent-rules/gl-write-once-buffers-are-immutable-storage.md`	Tests cover streamed-build equivalence, upload refusal, immutable storage, and inspector reads. The showcase test scopes asset loading and releases source bytes before later checks. Documentation records buffer behavior and measurements.

Temporal Coverage and Clipping

Layer / File(s)	Summary
Coverage means and color clipping `OloEditor/assets/shaders/PostProcess_TAA.glsl`, `docs/agent-rules/temporal-coverage-means-not-samples.md`	TAA gathers coverage means from stochastic-marked or fractional texels. Stochastic coverage selects 5×5 YCoCg clipping statistics at gamma 1.0; other pixels use the 3×3 path at gamma 1.25. The mixed estimated-and-stochastic case compares estimated-coverage means across current and reprojected previous surfaces.

Priority: ➖ Normal

Merge Risk: ⚪ Minimal · up to 48397

The documentation now accurately explains the stochastic-pixel coverage mean and points readers to the detailed section. No actionable merge risk remains in the reviewed change.

Pre-merge checks: 3 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Linked Issues check		`#1608` reports the default 6 GB suite and the ±5% card hand-over results as passing. The issue also requests finer-cell re-cooking for the Bernese and Samoyed card levels. The supplied change summary l…	Re-cook the Bernese and Samoyed card levels at a finer cell. Run both hand-over cases and record coverage and energy within the ±5% bar. Retain the default 6 GB suite result.

Passed checks: 3 passed

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly summarizes both primary changes: reducing breed-test memory use within the 6 GB ceiling and improving TAA history for stochastic coats.
Out of Scope Changes check		The immutable buffer APIs, streamed groom uploads, scoped coat copies, and related inspector and upload tests support `#1608`. The TAA shader, temporal documentation, and temporal tests support `#1627`. T…

Full details: Out of Scope Changes check

Explanation

The immutable buffer APIs, streamed groom uploads, scoped coat copies, and related inspector and upload tests support #1608. The TAA shader, temporal documentation, and temporal tests support #1627. The storage checks and groom-build refactoring support these implementations. No demonstrated change lacks a connection to the linked issues.

Full details: Linked Issues check

Explanation

#1608 reports the default 6 GB suite and the ±5% card hand-over results as passing. The issue also requests finer-cell re-cooking for the Bernese and Samoyed card levels. The supplied change summary lists no card asset or cooking change, and the PR does not claim that this re-cook occurred. #1627 is addressed by the TAA coverage and clip-box changes, including the reported coverage-halving response and temporal test results. #1607 is already passing at the reviewed head, so this PR does not need to reimplement that fix.

Resolution

Re-cook the Bernese and Samoyed card levels at a finer cell. Run both hand-over cases and record coverage and energy within the ±5% bar. Retain the default 6 GB suite result.

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⚠️ Outside diff range comments (1)

🔵 Trivial · Stale rule text: the opening section does not… · temporal-coverage-means-not-samples.md:4-7

docs/agent-rules/temporal-coverage-means-not-samples.md:4-7
📐 Maintainability & Code Quality | 🔵 Trivial | ⚡ Quick win

Stale rule text: the opening section does not describe the new estimator-only mean.

Lines 4-7 say TAA compares the 8x8 box means of RT3 .b wherever the current 4x4 holds a fractional coverage. The shader now uses the estimators' share of the mean when stochasticCoverage is also set (shader lines 515-519). The rule summary is incomplete for stochastic pixels. A reader who uses only the top section gets the wrong behavior. Add one sentence that points to the new section at Line 103.
📝 Proposed doc fix
-edge, keeps the range test (the current pixel clamped into last frame's 3x3 range). Issue #1552.
+edge, keeps the range test (the current pixel clamped into last frame's 3x3 range). Issue #1552.
+Where the 4x4 also holds the stochastic mark, the mean sums only the estimators' coverage
+(see "At a moving silhouette" below, #1627).
🤖 Prompt for AI Agents
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Review comment at @docs/agent-rules/temporal-coverage-means-not-samples.md
around lines 4 - 7:
Update the opening summary of TAA behavior to mention that when the 4x4
neighborhood also contains the stochastic mark, the mean includes only
estimators’ coverage; point readers to the “At a moving silhouette” section and
issue #1627.

🤖 Prompt to fix review comments

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Outside diff comments:
Review comments at @docs/agent-rules/temporal-coverage-means-not-samples.md:
- Around line 4-7: Update the opening summary of TAA behavior to mention that
when the 4x4 neighborhood also contains the stochastic mark, the mean includes
only estimators’ coverage; point readers to the “At a moving silhouette” section
and issue #1627.

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📒 Files selected for processing: 22

OloEditor/assets/shaders/PostProcess_TAA.glsl
OloEngine/src/OloEngine/Groom/GroomCasterPose.h
OloEngine/src/OloEngine/Groom/GroomStrandMesh.cpp
OloEngine/src/OloEngine/Groom/GroomStrandMesh.h
OloEngine/src/OloEngine/Renderer/IndexBuffer.cpp
OloEngine/src/OloEngine/Renderer/IndexBuffer.h
OloEngine/src/OloEngine/Renderer/Passes/GroomRenderPass.cpp
OloEngine/src/OloEngine/Renderer/Passes/GroomRenderPass.h
OloEngine/src/OloEngine/Renderer/VertexBuffer.cpp
OloEngine/src/OloEngine/Renderer/VertexBuffer.h
OloEngine/src/Platform/OpenGL/OpenGLResourceInspectorBackend.cpp
OloEngine/src/Platform/OpenGL/OpenGLVertexBuffer.cpp
OloEngine/src/Platform/OpenGL/OpenGLVertexBuffer.h
OloEngine/src/Platform/Vulkan/VulkanBufferResources.cpp
OloEngine/src/Platform/Vulkan/VulkanBufferResources.h
OloEngine/tests/CMakeLists.txt
OloEngine/tests/Groom/GroomGpuDeformationTest.cpp
OloEngine/tests/Rendering/ImmutableBufferStorageTest.cpp
OloEngine/tests/Rendering/PropertyTests/DogShowcaseEvidenceTest.cpp
docs/agent-rules/README.md
docs/agent-rules/gl-write-once-buffers-are-immutable-storage.md
docs/agent-rules/temporal-coverage-means-not-samples.md

💤 Files with no reviewable changes: 1

OloEngine/src/OloEngine/Groom/GroomCasterPose.h

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…mean (#1627) CodeRabbit on #1638: the opening rule still described the plain 8x8 mean for a stochastic pixel. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

drsnuggles8 · 2026-10-19T01:55:47Z

@coderabbitai The outside-diff finding on temporal-coverage-means-not-samples.md:4-7 is fixed in 4839777: the opening rule now says that where the 4x4 also holds the stochastic mark, the means sum only the estimators' coverage, and points to the #1627 section.

coderabbitai · 2026-10-19T02:04:09Z

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@drsnuggles8 Confirmed. The opening rule now states that when the current 4×4 neighborhood also contains the stochastic mark, the means include only estimator coverage and exclude opaque 0s and 1s. It also points to the moving-silhouette section and #1627. This addresses the outside-diff finding.

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drsnuggles8 and others added 9 commits October 18, 2026 14:20

docs(agent-rules): the TAA coverage mean leaves out only opaque texels (

b44b36d

#1627) Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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docs(agent-rules): the coverage rule's summary names the estimators' …

4839777

…mean (#1627) CodeRabbit on #1638: the opening rule still described the plain 8x8 mean for a stochastic pixel. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

drsnuggles8 merged commit 3d0fa1d into master Oct 19, 2026
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drsnuggles8 deleted the feature/groom-lod-breed-test-fixes-1607-1608 branch October 19, 2026 06:09

drsnuggles8 mentioned this pull request Oct 19, 2026

Two more dog breeds, a Bernese mountain dog and a Samoyed, generated in Blender and importable as editor assets #1558

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Breed evidence within the 6 GB ceiling; TAA keeps a stochastic coat's history at a moving silhouette - #1638

Breed evidence within the 6 GB ceiling; TAA keeps a stochastic coat's history at a moving silhouette#1638
drsnuggles8 merged 10 commits into
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#1608: the breed evidence suite runs within the 6 GB per-process ceiling

#1627: TAA keeps a stochastic coat's history at a moving silhouette

#1607

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