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radar: composite the OVERLAY plane -- SECTOR/SCALE were blank on every desktop path

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Playtester DOS-binary comparison: our radar showed blank SECTOR:/SCALE: values.
Root cause [T1]: the secondary CRT's low byte is authored as TWO ports
(L4GAUGE.CFG:4395-4396) -- sec (0x3F, btspal) + overlay (0xC0, btopal,
TransparentZero) carrying the btsec1ov graticule, the SCALE numeral
(RadarRange) and the SECTOR numerals (sectorDisplay).  Both numeral writers
are reconstructed and RUN -- their pixels were in the shared buffer's 0xC0
bits all along -- but every desktop expand indexed the LUT with pixel & 0x3F,
stripping them.  The arcade DAC indexed the FULL low byte.

Key mechanism: clut0 ALREADY holds the DAC's combined 256-entry table --
BuildSecondaryPalette (AllChannels, sec) fills all 256 indices and the
overlay's TransparentZero pass overwrites groups 0x40/0x80/0xC0 -- so the
composite is exactly a mask change, no blending code:

  - BTSecCompositeMask(): sec->GetBitMask() | overlay's (NULL-guarded, same
    display), used by BTDrawGaugeSurfaces + BTDrawCockpitPanels (surround),
    SVGA16::Update case 0 (pod parity), and the glass BlitSurface palette
    expand.
  - GlassWindowToken: the palette-expanded radar window's dirty token now
    includes the overlay port -- the SECTOR numerals tick on that plane, and
    a pixel-only 0x3F token would never repaint them.

The overlay's ColorMapper re-stomp over combined indexes is authentic (the
shipped machine ran the identical palette code) and is left alone.

Verified live (glass panels): SECTOR: 497.503 ticking with movement,
SCALE: 1000 at spawn (radarRange init 250*2^2 -- the DOS reference's 4000 is
max zoom, not a delta), and the btsec1ov graticule rules now draw.  KB:
GAUGE_COMPOSITE row 28 + polish list updated.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Cyd
2026-08-13 07:18:43 -05:00
co-authored by Claude Opus 4.8
parent 5cde991f56
commit d0e29a4d97
3 changed files with 53 additions and 5 deletions
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docs/GAUGE_COMPOSITE.md
+2 -2
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@@ -217,7 +217,7 @@ yet reconstructed (parse-skipped). The separate window is now the **live viewer*
- **Pod MFD port-name reconcile (pod-only):** a ~5-line positional dual-name fallback in `SVGA16::Update`
(`UL = GetGraphicsPort("auxUL2"); if(!UL) UL = GetGraphicsPort("Heat"); …`) so BT MFDs reach the pod's real
monitors. NOT a CFG rename (the CFG uses BT names pervasively + `MUNGA_L4` is shared with RP's aux names).
- **Polish:** overlay-plane compositing over `sec`; a pod-accurate RGB-packing toggle; texture atlas
- **Polish:** ~~overlay-plane compositing over `sec`~~ (DONE 2026-08-13, row 28); a pod-accurate RGB-packing toggle; texture atlas
(one lock/upload); device-reset recreate hardening for the additional swap chain.
## Widget reconstruction — the real fix (in progress; mapped by `bt-gauge-widget-recon-map`)
@@ -691,7 +691,7 @@ reconfigure/externalConfigure); parse-skip list EMPTY ([gskip]=0), all 50 attr b
| 25 | sec: headingPointer needle + numeric | YawPitchRoll decomposition (engine-convention port of euler[0]) | LIVE: 089→120 while turning under BT_GOTO | T2 | CORRECT |
| 26 | sec: numericSpeed | LinearSpeed (abs(adv)/dt) | LIVE: 0 parked → 176-182 walking | T2 | CORRECT (units question stays open) |
| 27 | sec: digitalClock MISSION TIME | engine mission clock (format enum arg) | LIVE: 09:19→06:04 counting | T0/T2 | CORRECT |
| 28 | sec: sectorDisplay (overlay) | localOrigin → Round(−Z·0.01)+500 / Round(X·0.01)+500 | commit 4a4ec68 [BT_SECTOR_LOG live]; NOTE: overlay plane not composited into the dev sec cell (polish item) — data verified by log | T2 | CORRECT |
| 28 | sec: sectorDisplay (overlay) | localOrigin → Round(−Z·0.01)+500 / Round(X·0.01)+500 | commit 4a4ec68 [BT_SECTOR_LOG live]; **overlay plane COMPOSITED 2026-08-13** (branch sec-overlay-composite): every sec expand (BTDrawGaugeSurfaces, BTDrawCockpitPanels, SVGA16::Update case 0, glass BlitSurface) now uses sec\|overlay = 0xFF — clut0 already held the arcade DAC's combined table (BuildSecondaryPalette spreads each port over the other's bit combos), so the fix is mask-only; the glass dirty token gained the overlay port so the numerals repaint. Verified live: SECTOR ticks + SCALE:1000 at spawn (1000 = radarRange init; the DOS shot's 4000 is max zoom) + the btsec1ov graticule now draws | T2 | CORRECT |
| 29 | sec: schematic ARMOR view (cmArmor/multiArmor, dama.pcc) | zone damageLevel ×100 → adpal ramp | incr.3/4; all-green pristine LIVE | T2 | CORRECT (AUTH-STATIC all-green solo) |
| 30 | sec: schematic CRITICAL view (cmCrit) | subsystem simulationState/damage | LIVE this audit: N-cycle shows the full subsystem list (GEN A-D, LOOP 1-6, HUD, SENSORS, GYRO, TORSO, weapons) | T2 | CORRECT |
| 31 | sec: schematic HEAT view (cmHeat) | subsystem currentTemperature tint | #6 pixel-verified; re-cycled this audit (mask 0x450421→0x490421→0x510421) | T2 | CORRECT |