arcattackandClaude Fable 5
48b17750e5
- dpl2d API fully recovered from the binary recorders (@487f34-488630): opcode model (points/lines/polyline/circle/color/width/matrix/push-pop), CallList = INLINE include (state persists to caller), centered coordinate frame (unit = half viewport height). game/reconstructed/dpl2d.cpp rework. - BTReticleRenderable ctor @004cc40c transcribed with the authentic calibration (originX .35, originY .25, scaleY .5, 0..1200m right range ladder, bottom heading tape, FUN_004cd938 tick ladders, lock rings, turn arrows); range caret slides from the live target range fed by the mech4 targeting step (BTSetHudTargetRange). - Weapon pips: the binary gate is IsDerivedFrom(0x511830 = MechWeapon::ClassDerivations) [T1: part_014.c:5386 hard-aborts on missing weapon attrs; part_012 counts + roster ORs capabilityFlags@+0x334] so ALL 7 BLH weapons register (3 lasers + 2 PPCs + 2 MissileLaunchers). Pip A (lit, authored PipColor) on TargetWithinRange, else dark ring B. - AddWeapon @004cdac0 store map corrected to the verified order (part_014.c:4827-4837); both state attrs are literally named "SimulationState" (strings @51d526/51d577) -> weapon simulationState. - Mech roster this[0x1ef] renamed poweredSubsystems -> weaponRoster (0x511830 is MechWeapon, not PoweredSubsystem=0x50f4bc); derivation-tag table added to context/decomp-reference.md. - Draw hook BTDrawReticle after the 3D scene, cockpit view only. Binary Execute @004cdcf0 is an un-exported gap -> Draw dynamics [T3], tracked in context/open-questions.md with the blx_cop canopy + PNAME pip meshes. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
80 lines
5.2 KiB
Markdown
80 lines
5.2 KiB
Markdown
# Phase 02 — dpl2d API recovery + BTReticleRenderable reconstruction (task #35)
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**Goal:** the main-view HUD (targeting reticle + up to 10 per-weapon pips).
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**Status:** COMPLETE (steps 1-5 live, verified 2026-07-08). dpl2d opcode model + CallList
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inline-include semantics in `game/reconstructed/dpl2d.cpp`; ctor glyph program + FUN_004cd938
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tick-ladder helper transcribed in `btl4vid.cpp`; per-weapon registration via the binary's real
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gate `IsDerivedFrom(0x511830 = MechWeapon::ClassDerivations)` (part_014.c:5386) — **7 pips** on
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the BLH (3 lasers + 2 PPCs + 2 MissileLaunchers), AddWeapon @004cdac0 store map verified
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(part_014.c:4827-4837; both state attrs are named "SimulationState", strings @51d526/51d577).
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Draw hook = `BTDrawReticle(device)` after the 3D scene, cockpit view only. The binary Execute
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@004cdcf0 is an UN-EXPORTED gap → Draw dynamics are best-effort [T3] (caret slide from live
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target range; pip A lit on TargetWithinRange else ring B). Step 6 (blx_cop canopy shell) and the
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PNAME1-8.bgf 3D pip meshes remain DEFERRED — tracked in context/open-questions.md.
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## The recovered dpl2d recorder API (libDPL 2D display lists) [T1]
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Every recorder self-identifies via its `FUN_0049a300(1, s_dpl2d_...)` debug-name string
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(part_010.c). Opcodes are the first word written into the list's command buffer.
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| FUN @ | dpl2d name | opcode | args |
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|---|---|---|---|
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| 00487f34 | NewDisplayList | — | → list handle |
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| 00487fbc | OpenDisplayList (Begin) | — | (list, mode) |
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| 00488030 | CloseDisplayList (End) | — | (list) |
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| 00488054 | FlushDisplayList (Compile) | — | (list) |
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| 004880e8 | AddOpenPolyline | 4 | closed-loop polyline begin |
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| 0048814c | AddClosePolyline (loop end) | 5 | |
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| 00488278 | AddOpenLines | 6 | open line-strip begin |
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| 004882dc | AddClosePolyline (strip end) | 7 | |
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| 00488340 | AddOpenPolypoint | 2 | point-set begin |
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| 004883a4 | AddClosePolypoint | 3 | |
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| 00488408 | AddPoint | 8 | (x, y) — vertex of the open primitive |
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| 0048847c | AddCircle | 9 | (x, y, r, fill) |
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| 00488500 | AddSetLineWidth | 0x15 | (w) — 1.0/2.0/3.0 used |
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| 0048856c | AddPushState | 0x12 | |
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| 004885cc | AddPopState | 0x13 | |
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| 00488630 | AddSetColor | 0xf | (r, g, b) floats |
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| 004886ac | AddSetColor (packed) | 0x16 | (argb?) |
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| 00488718 | AddSetMatrix | 0x10 | 6 floats (2x3 affine) |
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| 004887b0 | AddConcatMatrix | 0x11 | 6 floats + flag |
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| 00488850 | AddCallDisplayList | (nested) | (list) — glyph reuse |
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| 004888c0 | AddFullScreenClipRegion | | |
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| 00488b80 / 00488bac | 2x3 matrix build: identity / set-translate(x,y) | — | local helpers feeding AddSetMatrix |
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⚠ CORRECTION to the earlier AddWeapon recon comments: the "PushMatrix/MoveTo/PopMatrix"
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triple is actually **AddOpenPolypoint / AddPoint / AddClosePolypoint** = "draw a POINT" —
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`game/reconstructed/dpl2d.cpp`'s current Push/Move/Pop interpretation must be reworked to
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this opcode model (points, open/closed polylines, circles, width, color, push/pop state,
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set/concat matrix, nested list calls) and its `dpl2d_ExecuteList` renderer extended to draw
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them (XYZRHW screen-space lines/points/fans; state save/restore already present).
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## BTReticleRenderable — what the ctor builds (@004cc40c, part_014.c:4362) [T1 read]
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- Calibration from ctor params/templates: pip origin/bias/scale (+0x1fc..0x234 in class
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terms), min/max range from templates, `rangeScale = (clamped - lo) / (hi - lo)`.
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- Loads **PNAME1-8.bgf** (all ship in VIDEO/GEO) — pip/number meshes — plus a 3D
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renderable chain (FUN_00489708/489724/48ab0c/491cc4... — the dpl *3D* overlay object at
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0.12 scale) — the reticle has BOTH a 3D marker component and the 2D display lists.
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- Builds ~15 display lists: the master list (param_1[0x98]) composed of nested glyph lists
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via AddCallDisplayList: crosshair dot cluster (AddPoint xy at ±0.04/±0.1 = the dotted
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cross), heavier ±0.1..0.16 tick cross at width 3, two tick-LADDERS via FUN_004cd938
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(count 0xd=13 / 0x15=21 ticks, spacing/geometry from the calibration constants at
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[0x7f..0x88]: 0.35/0.25/0.5/±0.008/0.016...), side arrow polylines (the 4-vertex
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closed arrows at the ladder ends), an arc segment (AddCircle partial at 0.03?), and the
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heading/aim sub-lists ([0x9a..0xa1, 0xb6..0xba]) positioned by AddSetMatrix translates.
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- FUN_004cd938 = the tick-ladder builder (count, flag, scale, x, y, step, minor/major
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tick half-lengths) — transcribe next.
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## Remaining steps
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1. Rework dpl2d.cpp to the opcode model + extend ExecuteList (lines/points/polys/matrix/call).
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2. Transcribe the ctor's glyph program into BTReticleRenderable::BTReticleRenderable
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(+ FUN_004cd938 helper) with the authentic constants.
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3. Read + transcribe Execute (vtable PTR_LAB_0051db44 — find the Execute slot; per-frame:
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withinRange attr reads → pip list visibility/colors, aim/heading matrix updates).
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4. Read the 1996 caller wiring (FUN_004cef28's inside path: the ctor's 15 args + the
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AddWeapon per-weapon argument sourcing) and reproduce in MakeMechRenderables.
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5. Draw hook: the engine already calls mReticle->Execute() per frame (L4VIDEO ~6562);
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or execute from the BT renderer after the 3D scene; dpl2d_ExecuteList(device).
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6. The cockpit canopy shell (blx_cop, punch cutout) black-enclosure fix (BT_INSIDE_COCKPIT=1).
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