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Shadow storage noted a GPU write with the whole range its binding names: the copy-in skipped that range and the fence copied all of it back, so CPU writes to other fields of the same records never reached the GPU. Ocarina's lighting parameter is such a field: the lighting came out NaN and the fog pass drew the scene black. Each page a noted range covers now keeps a base copy, the copy-in moves only the bytes the CPU changed and the write-back only those the GPU changed (vk_memory.c merge_page). The mirror's merge shader marks the 4 KiB pages it changed, and one job per submission copies only those back (shadow_wb_cb); the copy-in reads the CPU-side generation tables through the shared write-watch snapshots; and a caller that reads guest memory itself resolves with vk_mem_lookup, which does not queue the pool for the copy-in. Pull request #394 by jacc. Its changes are taken as they are; one hunk met the lazy write-back that came later (vk_gpu_written_back) and is merged by hand. Added here: the lazy write-back stays off with shadow storage, because its fetch copies the mirror into the pool's buffer, which is guest memory only for an imported pool. Files other sessions are changing: runtime/vk_memory.c (the shadow section, the merge record, vk_gpu_written_back, wb_lazy) and three one-word call changes in runtime/vk_usnap.c. Without shadow storage (Windows outside Wine) the merge pipeline gains an unused fifth binding and two push constants and nothing else changes. The Windows files compile; nothing was run, on Windows, Wine or Linux. Co-Authored-By: Claude Fable 5.2 <noreply@anthropic.com>