Improve native rendering parity and enable 57 validation scenes by bkaradzic-microsoft · Pull Request #1913 · BabylonJS/BabylonNative

bkaradzic-microsoft · 2026-10-06T03:57:15Z

Summary

Improve native rendering parity with Babylon.js 9.29.0 / protocol 9:

Fix instancing, shader coordinates/varyings, texture sampling/readback, MSAA, and framebuffer handling.
Fix Canvas paths/clipping, image lifetime/I/O, text metrics, alpha representations, and mipmaps.
Improve validation runtime support and enable 57 additional scenes: 314 -> 371, with 349 excluded out of 720.

No upstream-enabled scenes are disabled. Reference images, comparison thresholds, and existing backend exclusions are unchanged.

16 commits: 14 code commits, one generated JavaScript bundle update, and one catalog update. Compute shaders, storage/dispatch changes, GPU instance repacking/topology expansion, protocol 10, and paired Babylon.js changes remain excluded.

Current status

Review: latest integer-coordinate, explicit-gradient, and interface-block concerns addressed. Maintainer approval is recorded.
CI: 33/33 jobs passed on e5ec2268. The snippet-service HTTP 403 failure cleared on retry without code changes.
Focused validation: 30/30 cases pass with WEBMIN disabled; 27 pass with default WEBMIN, with three interface-block skips; 2/2 DXIL compilation cases pass.
Earlier full validation: uninstrumented Hermes passed 371/371 scenes at the unchanged 512 MiB heap limit; full Hermes and Chakra/ASan native suites each passed 123/123.
Dependency: upstream JsRuntimeHost 2f8b9be3 includes the merged Hermes WeakRef fix from Release Hermes WeakRef targets after draining jobs JsRuntimeHost#262. No temporary runtime fork remains; all other dependency pins are unchanged.

Merged into master as 3428526f143f4eec86c4cf62d5bc493c1afca159.

Copilot

Copilot review overview

🟡 Changes recommended

Framebuffer clearing, varying locations, volume padding, MSAA defaults, and native branding contain correctness issues.

Review effort: Balanced
Findings: 2 · 3

Open (5)

Preserve explicit Vulkan interface locations and block type mapping · New
Prevent forgeable native wrapper identity · New
Default explicit framebuffers to single-sample · New
Prevent palette slot reuse before frame submission · New
Preserve logical depth for padded 3D textures · New

What changed in this PR

Improves rendering parity across Canvas, NativeEngine, shader compilation, textures, MSAA, and validation infrastructure, enabling 91 additional validation scenes.

Changes:

Adds Canvas clipping, image conversion, text metrics, and safer native wrappers.
Improves shader interfaces, texture formats, framebuffer handling, and instancing.
Expands validation coverage, assets, browser shims, fonts, and Havok packaging.

File	Description
`Polyfills/Canvas/Source/StbTrueType.cpp`	Adds script-aware kerning.
`Polyfills/Canvas/Source/Shaders/glsl/fs_canvas_unpremultiply.h`	Adds generated GLSL conversion shader.
`Polyfills/Canvas/Source/Shaders/fs_nanovg_fill.sc`	Applies rasterized clip masks.
`Polyfills/Canvas/Source/Shaders/fs_canvas_unpremultiply.sc`	Adds alpha-conversion shader source.
`Polyfills/Canvas/Source/Shaders/essl/fs_canvas_unpremultiply.h`	Adds generated ESSL shader.
`Polyfills/Canvas/Source/Shaders/dxbc/fs_canvas_unpremultiply.h`	Adds generated DXBC shader.
`Polyfills/Canvas/Source/Path2D.h`	Adds safe unwrapping and cleanup.
`Polyfills/Canvas/Source/NativeInstanceRegistry.h`	Introduces native-instance validation.
`Polyfills/Canvas/Source/nanovg/nanovg.h`	Defines clip-mask and path APIs.
`Polyfills/Canvas/Source/nanovg/nanovg.cpp`	Implements clip rasterization and path preservation.
`Polyfills/Canvas/Source/nanovg/nanovg_filterstack.h`	Supports separate filter compositing.
`Polyfills/Canvas/Source/nanovg/nanovg_filterstack.cpp`	Defers final filtered composition.
`Polyfills/Canvas/Source/nanovg/nanovg_babylon.cpp`	Integrates GPU clip masks.
`Polyfills/Canvas/Source/nanovg/fontstash.h`	Refines metrics and kerning.
`Polyfills/Canvas/Source/MeasureText.cpp`	Returns integral line metrics.
`Polyfills/Canvas/Source/Image.h`	Adds safe image unwrapping.
`Polyfills/Canvas/Source/Image.cpp`	Registers images and adjusts errors.
`Polyfills/Canvas/Source/Gradient.h`	Adds safe gradient unwrapping.
`Polyfills/Canvas/Source/Gradient.cpp`	Uses native-instance validation.
`Polyfills/Canvas/Source/FrameBufferPool.cpp`	Marks pooled targets single-sampled.
`Polyfills/Canvas/Source/Context.h`	Tracks persistent clip masks.
`Polyfills/Canvas/Source/Canvas.h`	Adds converted texture representations.
`Polyfills/Canvas/Source/Canvas.cpp`	Implements alpha and mip conversion.
`Polyfills/Canvas/shaderc.cmake`	Targets GLSL 330.
`Polyfills/Canvas/Readme.md`	Documents text metrics and fonts.
`Polyfills/Canvas/CMakeLists.txt`	Adds new Canvas sources and linkage.
`Plugins/TestUtils/Source/TestUtils.h`	Exposes MSAA control.
`Plugins/TestUtils/Source/TestUtils.cpp`	Validates MSAA and normalizes images.
`Plugins/ShaderCompiler/Source/ShaderCompilerVulkan.cpp`	Assigns Vulkan interfaces and built-ins.
`Plugins/ShaderCompiler/Source/ShaderCompilerTraversers.h`	Declares varying-location traversal.
`Plugins/ShaderCompiler/Source/ShaderCompilerTraversers.cpp`	Extends coordinate and varying transforms.
`Plugins/ShaderCompiler/Source/ShaderCompilerMetal.cpp`	Assigns Metal varying locations.
`Plugins/ShaderCompiler/Source/ShaderCompilerDXIL.cpp`	Assigns DXIL varying locations.
`Plugins/ShaderCompiler/Source/ShaderCompilerDXBC.cpp`	Assigns flattened DXBC varying locations.
`Plugins/NativeXr/Source/NativeXrImpl.cpp`	Uses floating-point framebuffer clears.
`Plugins/NativeEngine/Source/VertexArray.cpp`	Supports bufferless instancing.
`Plugins/NativeEngine/Source/NativeEngine.h`	Expands texture and framebuffer APIs.
`Plugins/NativeEngine/CMakeLists.txt`	Links image-format support.
`Documentation/Playground.md`	Documents validation runtime behavior.
`Core/Graphics/Source/Texture.cpp`	Updates volume, ownership, and LOD handling.
`Core/Graphics/Source/FrameBuffer.cpp`	Adds float clears and MSAA tracking.
`Core/Graphics/Source/DeviceImpl.h`	Declares MSAA querying.
`Core/Graphics/Source/DeviceImpl.cpp`	Implements MSAA querying.
`Core/Graphics/Source/DeviceContext.cpp`	Forwards MSAA operations.
`Core/Graphics/InternalInclude/Babylon/Graphics/Texture.h`	Extends texture ownership and LOD API.
`Core/Graphics/InternalInclude/Babylon/Graphics/FrameBuffer.h`	Extends framebuffer clear and MSAA API.
`Core/Graphics/InternalInclude/Babylon/Graphics/DeviceContext.h`	Exposes MSAA operations.
`Apps/UnitTests/Source/Tests.ShaderCompilation.FragCoord.cpp`	Clarifies coordinate tests.
`Apps/UnitTests/Source/Tests.ShaderCompilation.cpp`	Adds Vulkan interface tests.
`Apps/UnitTests/Source/Tests.NativeEngine.TextureFormats.cpp`	Expands texture validation tests.
`Apps/UnitTests/Source/Tests.NativeEngine.Msaa.cpp`	Updates MSAA framebuffer tests.
`Apps/UnitTests/Source/Tests.NativeEngine.Mipmaps.cpp`	Tests linear and sRGB mipmaps.
`Apps/UnitTests/Source/Tests.NativeEngine.ImageFormats.cpp`	Tests PNG transparency formats.
`Apps/UnitTests/Source/Tests.NativeEngine.DepthTextures.cpp`	Tests shared depth ownership.
`Apps/UnitTests/Source/Tests.NativeEngine.CubeRenderTargets.cpp`	Updates cube clear tests.
`Apps/UnitTests/Source/Tests.JavaScript.cpp`	Configures added runtime capabilities.
`Apps/UnitTests/Source/Tests.Device.SwapChain.cpp`	Updates float-clear tests.
`Apps/UnitTests/Source/Tests.Device.FrameEncoder.cpp`	Tests framebuffer MSAA state.
`Apps/UnitTests/Source/Tests.Device.D3D11.ExternalBackBuffer.cpp`	Updates external-buffer clears.
`Apps/UnitTests/Source/Tests.Device.cpp`	Updates recovery clear tests.
`Apps/UnitTests/Source/Tests.Canvas.Readback.cpp`	Tests Canvas image and texture conversion.
`Apps/UnitTests/JavaScript/src/tests.nativeEngine.png.ts`	Expands PNG decoding coverage.
`Apps/UnitTests/JavaScript/src/tests.nativeEngine.canvasImage.ts`	Tests Canvas-backed image drawing.
`Apps/UnitTests/JavaScript/src/tests.nativeEngine.attributeLessInstancing.ts`	Tests bufferless instancing.
`Apps/UnitTests/CMakeLists.txt`	Packages assets and new tests.
`Apps/Playground/Win32/App.cpp`	Disables debugger when headless.
`Apps/Playground/Shared/PlaygroundScripts.cpp`	Loads shims and procedural textures.
`Apps/Playground/Shared/CommandLine.cpp`	Documents headless debugger behavior.
`Apps/Playground/Scripts/native_env.js`	Supplies browser-like globals.
`Apps/Playground/CMakeLists.txt`	Packages Havok, fonts, and shims.
`Apps/package.json`	Adds Havok dependency.
`Apps/package-lock.json`	Locks Havok dependencies.
`Apps/Dependencies/DroidSans-PROVENANCE.txt`	Records DroidSans provenance.
`Apps/Dependencies/DroidSans-APACHE-2.0.txt`	Adds DroidSans license.
`Apps/Dependencies/Arimo-PROVENANCE.txt`	Records Arimo provenance.
`Apps/Dependencies/Arimo-OFL.txt`	Adds Arimo license.

Files not reviewed (1)

Apps/package-lock.json: Generated file

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Submit the requested instance count when a draw derives its per-instance data from gl_InstanceID instead of an instance buffer. Map vertex/instance built-ins to Vulkan's index built-ins and assign matching shader interface locations, including explicitly reserved locations. Add compiler and rendering regressions for these paths. Run the indexed and unindexed rendering regression on every real renderer, including D3D12 and installed-SDK consumers. Skip it only when the test build uses a no-op Metal device. Review-Group: E1 Source: PR BabylonJS#1888 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 60c2ec68-6de1-445d-9fc9-b699db737eae Split-From: a79dba316c9e38f9597fa4bf16f652551a20a864 Split-Part: code

Reject invalid buffer offsets, lengths, face/layer indices, and uninitialized textures before readback work begins. Check full source and destination storage sizes before bgfx's uint32 conversion. Link bimg independently of image decoding so these checks also build with image loading disabled. Review-Group: E2 Source: PR BabylonJS#1892 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 60c2ec68-6de1-445d-9fc9-b699db737eae Split-From: ac3f4081ed11b26f509693c60f97b296790451e2 Split-Part: code

Track genuine native Canvas, Image, Gradient, and Path2D instances in an environment-local registry before unwrapping them. Reject prototype- spoofed inputs without depending on mutable JavaScript instanceof behavior, while preserving valid overloads. Add regressions for forged objects and legitimate Canvas operations. Review-Group: E7 Source: PR BabylonJS#1844 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 60c2ec68-6de1-445d-9fc9-b699db737eae Split-From: 5333ecc57aebebb51753797a042de064d3391d6b Split-Part: code

Begin a fresh NanoVG path before constructing a strokeRect rectangle so cached geometry from an earlier operation is not stroked again. Add pixel regressions covering repeated rectangles and interaction with preceding drawing operations. Review-Group: N1 Source: Review branch cf56bbd Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 60c2ec68-6de1-445d-9fc9-b699db737eae Split-From: b22c311cdca10e3528688fbd68611ffc1dc2b46e Split-Part: code

Derive raster multisampling from the currently bound framebuffer rather than the window's sample count. Carry sample metadata through default, offscreen, Canvas, and filter targets so switching targets does not leak MSAA state. Expose validation sample control and add a framebuffer-state regression. Review-Group: N2 Source-Shotgun: d2727b4 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 60c2ec68-6de1-445d-9fc9-b699db737eae Split-From: c7a5b655d78734a143b17dad5afc76a7c6b5b87f Split-Part: code

Link Canvas directly to bimg for pixel conversion and PNG writing, including builds with image loading disabled, instead of bimg_encode. Use the upstream imageParse path for SVG and bitmap images without a second Canvas-specific parser or size cap. Cover RGBA output, fractional dimensions, the 4096-pixel bound, and invalid dimensions, and retain image onerror callback behavior. Review-Group: N3 Source-Shotgun: d2727b4 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 60c2ec68-6de1-445d-9fc9-b699db737eae Split-From: 09a32051c5f9c523dcb9f012aaecc8d4a9cffe57 Split-Part: code

Make fragment coordinates, texture sampling/fetches, cube orientation, and raw uploads agree on WebGL's logical row convention. Keep Canvas readback GPU-authoritative without an unused CPU pixel mirror, and include the required path-state helpers. Preserve upstream coordinate regressions; defer shadow and IBL integration cases needing Babylon.js changes. Review-Group: N4 Source-Shotgun: d2727b4 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 60c2ec68-6de1-445d-9fc9-b699db737eae Split-From: fb7d9aeb185c435291f78058dc2aabd39574d64d Split-Part: code

Adjust fontstash glyph placement and script-aware GPOS kerning to better match browser text rendering. Report an integral CSS line box separately from precise ink bounds so GUI layout and measureText agree. Add text regressions and font-loading hooks, and package licensed Arimo and DroidSans assets with their provenance. Review-Group: N5 Source-Shotgun: d2727b4 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 60c2ec68-6de1-445d-9fc9-b699db737eae Split-From: 2ef0aedee35ae5a7cd2aa6c6265161c45c35ab6a Split-Part: code

Preserve the caller's current path across immediate drawing operations and save/restore clip state correctly. Normalize signed rectangular clips and rasterize curved or compound paths into antialiased masks consumed by NanoVG draws. Update shader sources and compiled backends together, with nested-clip and path-preservation regressions. Review-Group: N6 Source-Shotgun: d2727b4 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 60c2ec68-6de1-445d-9fc9-b699db737eae Split-From: 6181f3efcacb1fae23b375a973b62c6c1560ced9 Split-Part: code

## Fix Call `Runtime::clearKeptObjects()` after draining Hermes microtasks, matching Hermes's own JSI and ABI embeddings. Without this, targets protected by `WeakRef` remain rooted across JavaScript turns, even after full GC. This was identified while investigating retained disposed scenes and heap exhaustion in BabylonJS/BabylonNative#1913. It does not increase the heap limit. ## Regression The new Hermes-only native test creates 256 one-MiB weak targets across job drains. The original embedding retains **268,437,568 external bytes** and fails the **64 MiB** bound; the fixed embedding passes. The regression is selected by CMake only for Hermes, alongside the existing engine-specific Node-API sources. Shared tests remain unchanged; other engines do not compile a reference to the Hermes-only `DrainJobs` API. Windows Hermes native Node-API/runtime/scheduling coverage: **10 passed, one existing engine-specific skip**. BabylonNative production validation with this runtime fix passes **123/123 native tests** and **371/371 rendering scenes**, with snapshots enabled, memory instrumentation disabled, stock Babylon.js 9.29.0, and the unchanged **512 MiB** heap limit. Follow-up CI is still required. ## CI follow-up Non-Hermes compilation is repaired by selecting the regression at build time, not with a runtime skip. JSI builds and passes its applicable runtime tests. The next run exposed an existing x86 Chakra scheduling assertion using `Date` (29 ms observed against a 30 ms bound). Timer tests now use the high-resolution `performance.now()` clock, with **unchanged minimum-delay assertions** and no scheduling implementation changes. The complete x86 Chakra suite passes **26/26**, including **251 JavaScript cases**, in each of **three consecutive iterations**. Fresh CI remains required. --------- Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 60c2ec68-6de1-445d-9fc9-b699db737eae

bghgary

[Reviewed by Copilot on behalf of @bghgary]

Concerns inline.

Keep no-mip LOD limits separate from spatial filters and pass image color space into mip generation. Match vertex/fragment varying locations, placing shared inputs before vertex-only outputs. Add native mip/filter and PNG upload regressions; defer paired Babylon.js integration tests. Defer the FXC nested-loop workaround until its SPIRV-Cross dependency lands. Review-Group: H1 Source-Shotgun: d2727b4 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 60c2ec68-6de1-445d-9fc9-b699db737eae Split-From: 872c2f1291162601894984f29b3d6fb062838a7a Split-Part: code

Add multiple-render-target attachment routing, shared sampleable depth, layer/mip selection, and explicit texture-handle ownership. Use floating-point clear colors and additional blend equations for HDR rendering, preserving float readbacks and manually authored mip levels. Migrate clear callers and retain upstream MSAA initialization with the correct framebuffer sample metadata. Keep protocol-9 clear and stencil payloads; defer the new mask fields. Review-Group: H2a Source-Shotgun: d2727b4 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 60c2ec68-6de1-445d-9fc9-b699db737eae Split-From: 8007d43a58afbc67d136b061c8cc2ccea3a78499 Split-Part: code

Extend render-target allocation to texture arrays and 3D volumes, map depth comparison functions, and use compatible backing storage for additional formats. Validate dimensions, layers, and comparison enums before mutation or integer narrowing, while preserving fractional-size truncation and default-layer behavior. Add allocation and invalid-input regressions. Review-Group: H2b Source-Shotgun: d2727b4 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 60c2ec68-6de1-445d-9fc9-b699db737eae Split-From: 9429dd4eb0b6d0c790971dd5c2b1abcf48facaad Split-Part: code

Keep Canvas render targets premultiplied internally, but produce a separate straight-alpha GPU copy when a dynamic texture requests it. Preserve the legacy premultiplied behavior when the argument is omitted and regenerate mipmaps for updated dynamic textures. Add conversion shaders for each backend and pixel-backed Canvas regressions; this contract requires matching Babylon.js uploads. Review-Group: H4 Source-Shotgun: d2727b4 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 60c2ec68-6de1-445d-9fc9-b699db737eae Split-From: 29b5f90601b9055e21f50f979697ddc2b8a5d87a Split-Part: code

Supply the globals, image/font setup, synthetic pointer handling, and engine options needed to run browser Playground scenes in Native. Match browser capture composition and sample settings, reset per-test state, and wait for GUI/utility-scene convergence before capture. Wire bootstrap loading and headless behavior without changing reference images or catalog budgets. Review-Group: H5a Source-Shotgun: d2727b4 Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 60c2ec68-6de1-445d-9fc9-b699db737eae Split-From: 56f09c7f26caf65db33d22e845f6b08d0f7c58e8 Split-Part: code

Build tests.javaScript.all.js once for the retained protocol-9 regressions. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 60c2ec68-6de1-445d-9fc9-b699db737eae

Enable the independent rendering cases supported by the reduced native stack. Defer newly enabled cases still failing stock CI, restoring their upstream catalog entries without disabling any upstream-enabled tests. Keep the original pixel budgets, references, scene IDs, render counts, and explicit backend exclusions. The catalog enables 371 of 720 cases. Babylon.js and native dependency pins remain unchanged. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 60c2ec68-6de1-445d-9fc9-b699db737eae

Copilot AI balanced review requested due to automatic review settings October 6, 2026 03:57

Copilot started reviewing on behalf of bkaradzic-microsoft October 6, 2026 04:03 View session

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bkaradzic-microsoft added 2 commits October 6, 2026 07:06

bkaradzic-microsoft force-pushed the shotgun-rendering-parity branch 4 times, most recently from 2613de1 to 251032c Compare October 6, 2026 16:22

bkaradzic-microsoft and others added 3 commits October 6, 2026 11:01

bkaradzic-microsoft force-pushed the shotgun-rendering-parity branch from 251032c to 2c3faf8 Compare October 6, 2026 18:09

bkaradzic-microsoft changed the title ~~Improve native rendering parity and enable 91 validation scenes~~ Improve native rendering parity and enable 60 validation scenes Oct 6, 2026

bkaradzic-microsoft changed the title ~~Improve native rendering parity and enable 60 validation scenes~~ Improve native rendering parity and enable 57 validation scenes Oct 6, 2026

bkaradzic-microsoft force-pushed the shotgun-rendering-parity branch from 2c3faf8 to a4b8d51 Compare October 6, 2026 19:19

bghgary reviewed Oct 6, 2026

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Comment thread Plugins/ShaderCompiler/Source/ShaderCompilerTraversers.cpp Outdated

Comment thread Polyfills/Canvas/Source/Canvas.cpp Outdated

Comment thread Plugins/NativeEngine/Source/NativeEngine.cpp Outdated

Comment thread Plugins/ShaderCompiler/Source/ShaderCompilerTraversers.cpp Outdated

bkaradzic-microsoft force-pushed the shotgun-rendering-parity branch from a4b8d51 to 8793618 Compare October 6, 2026 20:44

bkaradzic-microsoft mentioned this pull request Oct 6, 2026

Release Hermes WeakRef targets after draining jobs BabylonJS/JsRuntimeHost#262

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bkaradzic-microsoft and others added 4 commits October 6, 2026 15:11

bkaradzic-microsoft force-pushed the shotgun-rendering-parity branch from 8793618 to 0529ae9 Compare October 6, 2026 22:20

bkaradzic-microsoft force-pushed the shotgun-rendering-parity branch from 0529ae9 to 688e35f Compare October 6, 2026 23:38

bghgary approved these changes Oct 7, 2026

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bkaradzic-microsoft and others added 3 commits October 6, 2026 17:24

bkaradzic-microsoft and others added 4 commits October 6, 2026 17:24

Regenerate the combined JavaScript unit-test bundle

6401e91

Build tests.javaScript.all.js once for the retained protocol-9 regressions. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 60c2ec68-6de1-445d-9fc9-b699db737eae

bkaradzic-microsoft force-pushed the shotgun-rendering-parity branch from 688e35f to e5ec226 Compare October 7, 2026 00:25

bkaradzic-microsoft enabled auto-merge (squash) October 7, 2026 00:31

bkaradzic-microsoft merged commit 3428526 into BabylonJS:master Oct 7, 2026
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Improve native rendering parity and enable 57 validation scenes - #1913

Improve native rendering parity and enable 57 validation scenes#1913
bkaradzic-microsoft merged 16 commits into
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bkaradzic-microsoft commented Oct 6, 2026 •

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