port: D397 — file-select background + gun-barrel comb look: stale RENDERTILE import (fix in tree, by-eye owed)

Root-caused the D397 interlaced/comb symptom on the file-select
background and intro gun-barrel (first display, not round-trip):
titleRenderFolderMenuBackgroundLines loads 299 one-pixel 440-byte I8
rows with gDPLoadTextureBlock(I, 8b) and samples G_TX_RENDERTILE but
never emits gSPSetTile, so the tile's fmt/siz is whatever the previous
screen left (CI/4b spectrum-screen leftover, D116 probe). fast3d ran
the I8 bytes through import_texture_ci4 against a stale/all-zero
16-entry palette -> periodic black rows (GL texture-cache artifact,
not a ground-truth dither — no ROM RLE decode needed).

- gfx_pc.cpp import_texture: route the import through the source's
  fmt/siz when a CI/RGBA tile genuinely disagrees with an I8 8b load
  (mirrors the D229 case); real CI/RGBA textures untouched.
- gfx_opengl.cpp: GE_D397SH env-gated shader-formula probe for the
  file-select gunbarrel combine (label initially written as D398,
  renamed to avoid the PC-Options-label finding collision).
- findings: D397 row -> FIX LANDED (by-eye + PCDUMP verification
  owed); tail section notes the fix. CSV regenerated.

Cross-ref D182(2) (same symptom family), D159/D183 (disproven leads),
D229 (mirror-case precedent).

docs/dev/findings-index.csv

@@ -273,7 +273,7 @@ D393,FIXED,Controller B/Y both crouch; no in-game use button —,FIXED + user li
 D394,PARTIAL,Xbox 1.1 Jinx controller parity —,PARTIAL (port 1.1 gameplay button roles user-tested; exact gadget-category parity and other selectable presets outstanding; RB HD toggle unavailable).
 D395,PARTIAL,Controller trapped in keyboard/mouse-only binding capture —,"PARTIAL (both options UIs block pad-initiated capture; pad B can cancel an active modal; NTSC build linked, controller-only retest owed)."
 D396,PARTIAL,"F10 pad B/A used as slider decrement/increment, not back/select —","PARTIAL (B backs one F10 page, closes at root; A/X accept/toggle on edge but never shift a slider; D-pad/stick left/right still adjust; NTSC linked, pad retest owed)."
-D397,OPEN,SELECT FILE background + intro gun-barrel show an interlaced/comb look —,OPEN (re-scoped: D159 odd-row swap no-op'd (not cause); D183 pitch shear disproven; needs a live GE_PCDUMP capture + ROM ground-truth decode of the gun-barrel RLE image to settle ground-truth dither…
+D397,PARTIAL,SELECT FILE background + intro gun-barrel show an interlaced/comb look —,FIX LANDED (in tree; by-eye + PCDUMP verification owed):
 D398,FIXED,PC Options label: D348's procedural slider glyph replaced with an existing mainfolderimages texture (2026-09-27).,"SUPERSEDED by D400 (icon removed, text-only label; purple-hover bug moot; the D400 textMeasure arg-swap bug was found and fixed there)."
 D399,PARTIAL,File-select bottom row (SELECT FILE text + Copy/Erase + PC Options dot/label) shifted 15px left as a block (user sign-off 2026-09-27).,"LANDED (port-only, D343 class):"
 D400,PARTIAL,"File-select ""PC Options"" label:","LANDED (port-only, frontoptions.c):"

docs/dev/findings.md

@@ -681,7 +681,7 @@ covers D24–D69; the log continues in §H (D32 procedure, D70–D121).
 | D394 | **Xbox 1.1 Jinx controller parity** — user supplied the Xbox 1.1–1.4 control table; B is gadgets, stick clicks crouch, LB aim, RB HD toggle (not weapon cycling). | PARTIAL (port 1.1 gameplay button roles user-tested; exact gadget-category parity and other selectable presets outstanding; RB HD toggle unavailable). |
 | D395 | **Controller trapped in keyboard/mouse-only binding capture** — pad could enter the binding modal but could not finish or cancel without keyboard. | PARTIAL (both options UIs block pad-initiated capture; pad B can cancel an active modal; NTSC build linked, controller-only retest owed). |
 | D396 | **F10 pad B/A used as slider decrement/increment, not back/select** — B/Y fed Left and A/X fed Right on every row. | PARTIAL (B backs one F10 page, closes at root; A/X accept/toggle on edge but never shift a slider; D-pad/stick left/right still adjust; NTSC linked, pad retest owed). |
-| D397 | **SELECT FILE background + intro gun-barrel show an interlaced/comb look** — D182(2) family, but present on FIRST display, not only after re-entry (2026-09-27). Full `## D397` entry at file tail. | OPEN (re-scoped: D159 odd-row swap no-op'd (not cause); D183 pitch shear disproven; needs a live GE_PCDUMP capture + ROM ground-truth decode of the gun-barrel RLE image to settle ground-truth dither vs GL artifact. No blind fix made). |
+| D397 | **SELECT FILE background + intro gun-barrel show an interlaced/comb look** — D182(2) family, but present on FIRST display, not only after re-entry (2026-09-27). Full `## D397` entry at file tail. | FIX LANDED (in tree; by-eye + PCDUMP verification owed): root-caused — `titleRenderFolderMenuBackgroundLines` loads 299 one-pixel 440-byte I8 rows with `gDPLoadTextureBlock(I, 8b)` and samples `G_TX_RENDERTILE` but never emits `gSPSetTile`, so the tile's fmt/siz is whatever the previous screen left (CI/4b spectrum-screen leftover, D116 probe); fast3d ran the I8 bytes through `import_texture_ci4` against a stale/all-zero 16-entry palette → periodic black rows. Fix: `gfx_pc.cpp` `import_texture` routes the import through the source's fmt/siz when a CI/RGBA tile genuinely disagrees with an I8 8b load (mirrors the D229 case); `GE_D397SH` shader-formula probe added in `gfx_opengl.cpp`. D159/D183 leads stand disproven; no ROM RLE decode needed. |
 | D398 | **PC Options label: D348's procedural slider glyph replaced with an existing mainfolderimages texture (2026-09-27).** Full `## D398` entry at file tail. | SUPERSEDED by D400 (icon removed, text-only label; purple-hover bug moot; the D400 `textMeasure` arg-swap bug was found and fixed there). |
 | D399 | **File-select bottom row (SELECT FILE text + Copy/Erase + PC Options dot/label) shifted 15px left as a block (user sign-off 2026-09-27).** Full `## D399` entry at file tail. | LANDED (port-only, D343 class): `selectpos.f[0]` 110→95 (new `#ifdef PORT` in front.c), Copy 200/222→185/207, Erase 282/304→267/289 (D343 PORT block), `LABEL_X` 358→343 (`frontoptions.c`); hit bounds recompute from the shifted positions. Clean build, PCDUMP frame 195 no overlaps; by-eye check owed. |
 | D400 | **File-select "PC Options" label: icon removed, text-only; fixed a swapped textMeasure() arg bug and a 7px vertical misalignment vs Copy/Erase (user sign-off 2026-09-27).** Full `## D400` entry at file tail. | LANDED (port-only, `frontoptions.c`): D398's dot icon dropped on user instruction ("most straightforward design"); label now a plain `textRender` word, GAP 28 after Erase. Two measurement bugs fixed: (1) `textMeasure(textheight, textwidth)` args passed swapped -> label 35px above the bar, hot band transposed; (2) bare-label height measures 0 (vs 14 for newline-terminated Copy/Erase) -> 7px lower tops; fixed by restoring the `kLabelNL` height measure. PCDUMP frame 195: tops aligned 279.8 vs 279.3, 31px clearance from Erase; by-eye check owed. |
@@ -15175,6 +15175,8 @@ I logged all of this as **D397** (`docs/dev/findings.md`, index CSV, and the D18
 
 **Owed (concrete next steps, single session):** (a) one `GE_PCDUMP` capture of the fresh file-select screen + the intro gun-barrel (not a round-trip); (b) ROM ground-truth decode of the `unknown2` gun-barrel RLE image (`tools_pc` extract of `assets/ge007.u.2A4D50.usedby7F008DE4.bin`) to settle cause 1 vs 2; (c) if cause 2, an `GE_DTEX` sweep of the 299 row imports to confirm cache/STRIDED behaviour. Cross-refs: D182(2) (same symptom, round-trip trigger), D176(b) (Family A, disproven), D159 (no-op'd), D183 (pitch de-stride, latent no-op here).
 
+**Fix landed (in tree, 2026-09-28) — status: awaiting by-eye + PCDUMP verification.** The live capture found the tile was imported as **CI/4b — the spectrum-screen leftover** (D116 probe), i.e. cause 2 (GL texture-cache artifact), not a ground-truth dither: `titleRenderFolderMenuBackgroundLines` samples `G_TX_RENDERTILE` but never emits `gSPSetTile`, so the tile's fmt/siz is whatever the previous screen left; fast3d then ran the I8 bytes through `import_texture_ci4` against a stale/all-zero 16-entry palette → periodic black rows. Fix in `gfx_pc.cpp` `import_texture`: route the import through the **source's** fmt/siz when a CI/RGBA tile genuinely disagrees with an I8 8b load (mirrors the D229 mirror case above it); real CI/RGBA textures are untouched because the guard only fires on a genuine format disagreement. A `GE_D397SH` shader-formula probe (`gfx_opengl.cpp`, env-gated) was added to inspect the file-select gunbarrel combine; the label was initially written as "D398", which collided with the PC-Options-label finding and was renamed to D397. No ROM RLE decode (step b) is needed to verify: the PCDUMP of the file-select + intro gun-barrel screens against the pre-fix capture is the check.
+
 
 ## D398 — PC Options label: IMG_DOT texture replaces the D348 procedural slider glyph (2026-09-27)