rahul05ranjan 540ee9fbc5 Motion Tile: mirror folds sample the edge texel, not the transparent outside ...

A tile boundary that lands exactly on an output pixel centre puts the tile
fraction at exactly 0 or 1, and the sample position at the source's geometric
edge — where sample_bilinear mixes in half a texel of the transparent outside.
The fold column comes out half-faded: a visible seam line along the mirrored
boundary, which sweeps the tile as Tile Center animates across pixel centres
(#2820). Both the CPU path and the GPU kernel switch to the clamped sampler,
which repeats the edge texel there; interior samples are untouched, and the
default single-tile identity mapping already sampled texel centres.

The regression test puts the folds exactly on pixel centres (tileWidth 50%,
centre on the layer, mirror on) and asserts the fold columns stay opaque and
equal the edge texels they mirror — it fails on the unfixed code at alpha 0.5.

Fixes #2820

Co-authored-by: rahul05ranjan <11793455+rahul05ranjan@users.noreply.github.com>

2026-11-02 12:30:58 +00:00

..

src

Motion Tile: mirror folds sample the edge texel, not the transparent outside

2026-11-02 12:30:58 +00:00

Cargo.toml

fix: contain GPU initialization and retire failed readbacks

2026-10-06 16:40:12 -05:00