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fix: Respect custom alignment of nested loose schemas - #3260
cieplypolar wants to merge 4 commits into
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Caution
This PR does not compile. tsc fails with two TS2322 errors in packages/typegpu/src/data/dataIO.ts, which breaks the typegpu build and every CI job that depends on it (build-and-test on built packages, test:types/test-misc, docs, treeshake, publish). This needs to be fixed before merge.
( ◦°^°◦) 🏴☠️ Avast, me hearties! I read the whole diff, ran the core test suite (2969 tests, all passin'), typechecked the core package, and spied the build barrrking at a type error in the new array writer — she'll never make port with that readonly unknown[] keel.
Reviewed changes
alignmentOfrecursion —unstruct/disarraynow delegate tocustomAlignmentOfinstead of peeking at the first property's raw custom alignment, so custom alignment propagates through nesting.offsetsForPropstrailing padding — usessizeOf(struct)directly, dropping spurious trailing padding forunstruct(no change forWgslStruct, whose size is already rounded).- Fallback reader/writer rewrite —
struct/array/unstruct/disarrayare now placed byoffsetsForPropsoffsets androundUp(sizeOf(elementType), alignmentOf(schema))stride, andalignIOwas removed from thedecorated/loose-decoratedpaths, aligning the fallback with the already-offsets-based compiled writer. getPatchInstructionsstride — derives disarray/array element stride fromalignmentOf(arrSchema)rather thanalignmentOf(elementType).- Tests — added nested-alignment coverage in
disarray.test.ts,internal/arrayBufferIO.noEval.test.ts,internal/partialIo.test.ts, andunstruct.test.ts.
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pkg.pr.new packages benchmark commit |
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✅ No new issues found.
Reviewed changes
This run re-reviewed the one commit added since the prior pullfrog review (f7ddd896, type-only). The TS2322 build break is resolved and no new issues were introduced.
- Typed the shared fallback writer params —
writeStructLikeandwriteArrayLikenow declareInferInput<wgsl.WgslStruct | Unstruct>/InferInput<wgsl.WgslArray | Disarray>instead ofRecord<string, unknown>/readonly unknown[], so thesatisfies CompleteDataWritersassignment accepts the typed-array members ofInferInput. Verified locally:pnpm --filter typegpu test:typesandtsc -p tsconfig.build.json --noEmitboth exit 0.
Prior pullfrog review feedback (the writeArrayLike parameter type) is addressed; the corresponding thread is resolved.
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Bundle size comparison (
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| 🟢 Decreased (max -0.23%) | ➖ Unchanged | 🔴 Increased (max 0.53%) | ❔ Unknown |
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| 34 | 320 | 1 | 0 |
import * as ... in PR vs import * as ... in target (did bundle size increase?):
| Test | tsdown |
|---|---|
| d_alignmentOf.ts | 29.10 kB ( |
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| it('reads wgsl structs packed into an unstruct', () => { | ||
| const s = d.unstruct({ a: d.u32, s: d.struct({ v: d.vec3u, w: d.u32 }) }); |
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Could you convince me as to why structs should pack tightly instead of aligning based on the alignment of their natural alignment? Is it because vectors don't either?
iwoplaza
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iwoplaza
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The implementation looks very solid! I am mostly wondering about the behavior, but I am easily persuaded 😆
Changes:
alignmentOfforunstructanddisarray. Now, it recurses into the schema.offsetsForPropsno longer adds trailing padding tounstruct.unstructs.