# Vendored Smithay

- Repository: https://github.com/Smithay/smithay
- Revision: `8a270232f1bfc416c781273c98a3f52a812a0bba`
- Source: complete tracked snapshot from `git archive --format=tar 8a270232f1bfc416c781273c98a3f52a812a0bba`. No `.git`, `target`, or untracked Cargo cache markers are included.
- Original archive: 4894720 bytes; SHA-256 `81a42cfd4c3626c9bad8051023970151dcea0fe7bedd02fc09105db360a847c2`.
- Original snapshot: 345 regular files; 4559959 content bytes. File contents, symlink targets and Git executable bits were independently verified against the archive. Archive ownership and write permissions follow the extracting user's normal umask.
- Licenses are preserved in `LICENSE.txt`, `smithay-drm-extras/LICENSE`, and individual source headers.

## Local patch

`patches/shm-texture-cache-format.patch` changes the GLES SHM surface-cache compatibility check to match dimensions, GL internal format, and alpha interpretation. Previously an equal-sized ARGB/XRGB change reused stale `has_alpha`, selecting the wrong shader variant. A newly allocated texture also forces a complete upload. Context identity is already part of the cache key. Offset and stride describe each upload's source and are read anew; SHM cache entries always have normal orientation and non-external storage, so those properties do not add compatibility criteria.

At most 16 debug records per process describe format incompatibilities. Records contain only numeric format/dimension fields, alpha booleans, and a fixed event message. They contain no pixel data, application text, titles, or credentials.

The independent private-Wayland GPU regression is in Ferese's `compositor/src/state/partial_shm_gpu_tests.rs`. It compares the cached renderer with a new, unshared EGL context and full upload/full repaint on every frame, in both ARGB-first and XRGB-first directions. The ordinary partial-damage regression shares the fixture.