Bump filament to 1.71.4, swiftshader fo latest

[mcooley]

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[mcooley]

Opus 4.7 generated notes on the upstream content we're bringing in:

Submodule	Was	Now	Δ
filament	b89a05a3 (v1.67.1, 2025-11-19)	a0ecdbbe (v1.71.4, on release)	653 commits
swiftshader	d7bc9573	f9d5d49a (master tip)	24 commits

Filament

Our footprint: Vulkan backend, gltfio + ubershader, offscreen renderStandaloneView → readPixels, custom CallbackHandler. So I filtered the 653-commit range against the Vulkan backend, gltfio, Engine, and core API paths, plus the curated RELEASE_NOTES.md v1.68.0 → v1.71.4 range.

gltfio (the part we exercise most heavily)

• ffa28864 gltfio: Fix security and memory corruption issues in Utility.cpp — security hardening of glTF parsing. Notable because we feed potentially-untrusted glTF input into AssetLoader::createAsset. Worth being aware of.
• 8d16ad88 gltfio: Fix vulnerabilities in ResourceLoader.cpp — same category. We call mResourceLoader->loadResources(asset) in RenderManager::loadGLTFAsset.
• e6e7c032 uberz: Fix vulnerabilities in convertOffsetsToPointers without aborts — this code path is used during ubershader provider init.
• d41cfacf gltfio: Harden ResourceLoader buffer unpacking and skin bind copying — same theme.
• 3a78c78e gltfio: Continue if floatsCount is 0 in ResourceLoader.cpp
• 6193f489 gltfio: prevent malformed gltf+draco mesh — we don't use Draco but it lives in the same parse path.
• 491531c7 gltfio: fix possible overflow for meshopt decompression
• 901c8776 gltfio: add null check for when image is not provided
• 1ddd10f3 Fix: Morph Target animations (Blend Shapes) fail to render when loading GLB files via ResourceLoader — only matters if any rendered scenes use morph targets.
• 7ed5379a gltfio: fix createInstance() overwriting morph target buffers — same caveat.
• 3ab362d5 gltfio: zero-initialize accessors with undefined bufferViews (post-v1.71.4 main, won't be in our update)
• 7f61eb7a GLTFIO Webp Texture Support + v1.68.4 — gated behind FILAMENT_SUPPORTS_WEBP_TEXTURES cmake flag, defaults OFF, so no behavioral change unless we opt in. Worth knowing if we ever want it.
• cdfb92e1 gltfio: Allow compile-time override of GLTFIO_USE_FILESYSTEM — could let us shave a small dependency, optional.

Vulkan backend

• af345728 VK: Add support for VK_KHR_global_priority — driver-level only; harmless for SwiftShader, which doesn't expose it.
• 719914fb VK: Better support for renderdoc captures — useful for debugging us.
• 5177b5c9 vk: make fbo eviction time configurable — only relevant if you want to tune long-running render servers; default behavior preserved.
• 41183e33 Use fence pool in Vulkan to ensure conversion to FD always provides an FD — robustness fix, no API surface.
• 193eafc4 backend: typed clear-color value for integer-format attachments — we use RGBA8 (float clears), unaffected.
• 4bfe3b99 Several fixes caught by ASAN — backend-wide stability fixes.
• 107276e9 VK: Refactor platform Vulkan initialization + d52fb1f4 vk: refactor to use polymorphism for platform specialization — internal restructuring; could be relevant if we ever subclass the Vulkan platform. As long as we keep using the default platform, no impact.
• 73862203 Stream API Vulkan Backend — we don't use Streams.

Engine core / threading (worth a careful read given our async work)

• f1ffb783 Add automatic frame skipping / v1.68.5 engine.skip_frame_when_cpu_ahead_of_display — feature flag, off by default for offscreen use, but check whether the flag is exposed somewhere we'd want to ensure it stays off for renderStandaloneView.
• f4a079f6 backend: Propagate backend thread exceptions to the main thread — directly relevant to us. Right now we noted "the native side will not report exceptions through the callback, so this is a defensive path" in Renderer.cs. After this change, GPU/driver-thread exceptions may actually surface through callbacks; the defensive SetException code may stop being defensive. Worth re-checking that path after the update.
• 7701e7a5 Handle deferred destruction for asynchronous objects — directly related to the lifecycle reasoning we did for destroyRenderResources ordering. May change when it's safe to destroy a View/RenderTarget. Could simplify (or invalidate assumptions in) our cleanup ordering. Worth reading the diff.
• 2c5842f9 Implement asynchronous resource management + 96e23665 Add config option for asynchronous mode + 0eff54b8 Add async support check to backend + 53a94c45 Add thread pool and callback manager / knobs for enabling + disabling prewarm — large pile of async-resource-management work. By default this is opt-in; current synchronous load path should still work. If we ever want to load multiple glTFs concurrently, this is the on-ramp.
• 1b5916b6 Rename AsyncCallbackType to AsyncCompletionCallback — API rename. We don't reference either symbol, so no impact.
• 4d96f188 backend: CallbackHandler dstor inlined in header — affects us because we derive ImmediateCallbackHandler from backend::CallbackHandler. Compile only; no source change required.
• 71e8cab0 Fix a race when garbage-collecting components
• e830ec28 Prevent circular buffer overflow during UboManager reallocation — robustness.
• 83653fb3 engine: encapsulate material cache handling / 0b63969a Make the LruCache size of material/program cache configurable / 2f1266f7 engine: add program cache — internal speedups, no API change for us.
• fb875bfb Add colorGrading method to Engine::Builder for default LUT configuration — new convenience API; we don't use color grading.

Material / shader versioning

Material binary version bumped at v1.68.0, v1.70.0, v1.71.0. We use the bundled UBERARCHIVE_DEFAULT_DATA/UBERARCHIVE_DEFAULT_SIZE, which is rebuilt together with filament, so this is transparent — but if anyone ever ships precompiled .filamat files alongside, they'd need a rebuild.

Other

• v1.70.0 engine: fix crash when using variance shadow maps — defensive value: we don't use VSM, but might.
• f701c1e1 Implement KHR_materials_dispersion + 008534b8 Fix dispersion with uber-shaders + v1.68.3 — new glTF extension support, propagates through ubershader. Could affect rendering of certain authored materials.
• e85c021d remove the now unneeded FL0 materials — drops feature-level-0 materials. We don't target FL0.
• Filament now targets C++20 (v1.64.0, predates our recorded version) — already in effect, no change.

SwiftShader — full list (only 24 commits)

f9d5d49 Add missing include for LLVM_VERSION_MAJOR
27dd2ae Implement full ARM/AArch64 multiarch compatibility for SwiftShader Reactor
6cc7757 Update primitive batch size calc for line/point polygon modes
8955613 Backport macOS ARM64 ASAN dynamic shadow offset from LLVM 12+
313545f Fix Regres commit retrieval
242a812 Fixed: memoryTypeBits incorrectly included property flag in vkGetMemoryHostPointerPropertiesEXT()
b7b7fd2 swiftshader: llvm-16.0: remove unnecessary virtual specifier
3b5edab Set Update Mechanism to Manual
374652a Regres: Update test lists @ b0c7e1fb
b0c7e1f Regres: Update test lists @ 9c9be842
9c9be84 Update OWNERS
76b5d96 Regres: Update test lists @ e5b3afce
e5b3afc Pin targets using LLVM10 and LLVM16 to C++20
0a24bb8 Support cmake build for loongarch64.
e391edb Flip inverted VK_EXT_descriptor_indexing ASSERT
07b52b2 add gn build arg to make inclusion of ASTC sources optional
8e12559 Fix build error when use llvm16 in Debug mode.
5aa3ef6 Regres: Update test lists @ ff4435d3
ff4435d Fix riscv64 build problem with LLVM 16
42f6e05 Regres: Update test lists @ 518a9f63
518a9f6 Fix api version comparison in vkCreateInstance()
04fbb7d Regres: Update test lists @ 498a6f76
498a6f7 Suppress -Wunnecessary-virtual-specifier
be8ed1d Regres: Update test lists @ d7bc9573

Functional changes that could touch us:

• 6cc7757d Update primitive batch size calc for line/point polygon modes — only matters if we render lines/points; we don't.
• 242a8121 Fix memoryTypeBits in vkGetMemoryHostPointerPropertiesEXT — narrow fix, only triggered if filament uses host-pointer imports (it doesn't on the default Vulkan path).
• 518a9f63 Fix api version comparison in vkCreateInstance — bug fix that could be hit on first init depending on the Vulkan API version filament requests; unlikely to be a regression.
• e391edb8 Flip inverted VK_EXT_descriptor_indexing ASSERT — only matters in debug builds; we use Release for SwiftShader (see build-native.py), so no effect.
• 27dd2aeb ARM/AArch64 Reactor multiarch + 8955613 macOS ARM64 ASAN + 0a24bb8 loongarch64 build + ff4435d riscv64 build — build/portability only; we build x64.

Everything else in swiftshader's range is test-list refreshes, OWNERS updates, or LLVM-version build warnings.