ddidderr 2040677b05 fix-deviant(renderer): don't over-allocate Metal buffers by sizeof(T) ...

Intentional deviation from Ghostty 1.3.1 (DEVIANT_FIXES.md row 34).
When a Metal buffer grows, Zig's renderer/metal/buffer.zig:89 and :146
compute the new size as twice the required *byte* count and then
multiply by @sizeOf(T) again, so large cell buffers allocate
sizeof(T) times more GPU memory than intended. The Rust Metal backend
(since bab49ee) allocates exactly twice the required bytes; this commit
factors the computation into metal_layout::grown_buffer_bytes, adds a
regression test and records the deviation.

Test Plan:
- cargo test -p ghostty-renderer
  grown_buffer_bytes_is_double_the_required_bytes_not_scaled_by_size_of_t
- just check-macos

2026-10-12 16:23:54 +02:00

..

rewrite

fix-deviant(renderer): don't over-allocate Metal buffers by sizeof(T)

2026-10-12 16:23:54 +02:00