test(sprite3d): cover the WebGL draw path + CHANGELOG highlight#1519
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Follow-up to #1513. Adds an automated WebGL draw smoke for Sprite3d — the path that was previously only validated by the Billboard example screenshot (and where the getTexture regression once hid). `tests/sprite3d_webgl.spec.js` drives real Sprite3d instances through `WebGLRenderer.drawMesh` → `MeshBatcher` under a Camera3d and asserts the draw reaches the GPU (`drawElements > 0`) without throwing: - plain-image Sprite3d (the getTexture/atlas-resolution case) - animated spritesheet (atlas UVs uploaded) - alphaCutoff default 0.5 + the alphaCutoff:0 path (uniform set) - a flipped sprite Runs under software WebGL (failIfMajorPerformanceCaveat:false); skips when WebGL2 is unavailable, mirroring the existing webgl_mesh_depth harness. Also adds Sprite3d / 2.5D to the 19.8 CHANGELOG Highlights line (it was glTF-only). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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What
Follow-up to #1513. Closes the one test gap identified during pre-release review:
Sprite3dwas never drawn through the WebGL path — the other specs run under Canvas and test the billboard/atlas/flip math directly, soSprite3d.draw → WebGLRenderer.drawMesh → MeshBatcher(texture upload,uAlphaCutoffuniform, atlas UVs reaching the GPU) was only ever validated by the Billboard example screenshot. That's exactly where thegetTextureregression once hid.New spec —
tests/sprite3d_webgl.spec.jsDrives real
Sprite3dinstances throughdrawMesh/MeshBatcherunder aCamera3dand asserts the draw reaches the GPU (drawElements > 0) without throwing:alphaCutoffdefault0.5and thealphaCutoff: 0path (uniform set both ways)Runs under software WebGL (
failIfMajorPerformanceCaveat: false); skips when WebGL2 is unavailable — same harness aswebgl_mesh_depth.spec.js, so it's CI-safe.Also
Adds
Sprite3d/ 2.5D to the 19.8 CHANGELOG Highlights line (it was glTF-only).Verified locally: the new spec runs (4 pass, not skipped) under software WebGL; full suite 4403 passing.
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