[psdevhh]

What and why

Alien: Isolation opens the display named Default through nn::vi::OpenDisplay. The SDK's implementation dereferences a missing vi service client during window setup. Hook the named call and reuse the static object returned by OpenDefaultDisplay for the name advertised by ListDisplays. Unknown names return an error.

Checked

• Documentation tests passed after rebasing onto dac4a433. The upstream SARC reader change leaves the tested host and chain inputs identical.
• Standalone branch on main at b1dee89c. The host suite (make -C dm/host/tests GAME=010015100B514000 run), documentation tests and LLVM 23.1.4 clang-tidy check of dm/gfx/hle_vi.c passed.
• Integration validation on Apple M4, macOS 27.2. Alien: Isolation 010075D00E8BA000, base build 1.1_46609, passed window setup and reached the first playable room. The rebased integration also passed window setup and submitted shaders during the GLSLC capture boot.
• regress.py impact points to four profiles that call OpenDefaultDisplay. Dark Souls Remastered 1.0.3 (01004AB00A260000) imports that entry point. In the 65-second comparison both revisions reached the frame target with no new warnings. A shorter run flagged SetRenderEnableConditional only on the candidate. Both revisions emitted it in the longer run. The harness marks the boot column FAIL for an existing depth-mode mismatch on both revisions. Other games and iOS gameplay were outside this check.
• GitHub clang-tidy reports two findings in the unchanged t_geometry_hazards.m, covered by upstream PR C lint: t_geometry_hazards checks its readback buffer, and notes who owns its program #979.

Dark Souls Remastered regression report

regress.py check (full): PASS

Baseline origin/main b1dee89, candidate HEAD 9d785f0; Apple M4, macOS 27.2, Xcode 27.2; 131.7 s

game	status	shaders (base → cand)	newly failing	newly building	changed MSL	interface (new / known)	boot	fps p50	frame p99 ms	peak MB	prepare s	new RED
01004AB00A260000 01004AB00A260000	PASS	3099/3099 → 3099/3099	0	0	0	0 / 0	FAIL	51.0 → 50.7	58.2 → 62.01	1783 → 1924	None → None	0

01004AB00A260000 01004AB00A260000: PASS

• known (baseline too): profile depth_mode gl disagrees with runtime depth_mode zero: rebuild the pipeline archive with the observed mode
  • baseline: exit None, first frame 0.5 s, max frame 3558, reached True, prepare None s, fps 51.0, p50/p99 16.66/58.2 ms, peak 1783 MB
  • candidate: exit None, first frame 0.5 s, max frame 3530, reached True, prepare None s, fps 50.7, p50/p99 16.66/62.01 ms, peak 1924 MB
  • time: chain 0.9 s, smoke 130.6 s

Docs

• Updated docs/reference/services.md#vi-layer-and-display-calls-without-vi-service-objects and regenerated the symptom index.
• The change contains source and documentation only.