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PPC hit scrambles the secondary displays (phase-14, all three work items)

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Restores the PPC's authentic secondary-display effect: an EnergyDamageType hit
scrambles every secondary cockpit display for 0.8s while the main out-the-window
view stays clean.  Was fully specced (phase-14) with the engine half already
present under the original VWE names; only the trigger and the visual were
missing (the visual STUBBED since 2007).

A -- TRIGGER (game/reconstructed/mech.cpp): in TakeDamageMessageHandler, at the
  binary's @0x4a03f3 position (after the cylinder resolve, before the burst
  loop, so ONCE per damage message) fire
  GetGaugeRenderer()->SpecialEffect(scrambleVideo, damageType*0.2f) on
  EnergyDamageType (==4).  That type is authored on exactly the 14 PPC/ERPPC
  records, so the branch is structurally PPC-exclusive -- no weapon-class check.
  Duration DERIVED from the ordinal (4*0.2==0.8s), not a literal.  BT_DMG_LOG
  prints [ppc-scramble].

B -- VISUAL (SVGA16::FunkyVideo, was the 2007 stub): FunkyVideo now arms
  scrambleActive; new SVGA16::ScrambleRowShift is a per-source-row horizontal
  shear+roll, read by BOTH DrawDevSurface (surround/dock) and ExpandPlaneToBGRA
  (glass windows, native + rotated radar), so all secondary surfaces shear
  together in source space and the main 3D view (separate timing chain) is
  untouched -- the modern stand-in for the VGA CRTC Horizontal-Total detune.
  Tunable: BT_SCRAMBLE_SHEAR (px/line, def 4), BT_SCRAMBLE_ROLL (px/sec, def
  220); BT_SCRAMBLE_TEST=1 forces it on for tuning by eye.

C -- NON-STACKING LATCH (L4GaugeRenderer::SpecialEffect): ignore the re-arm while
  scrambleVideoFlag is set (matches the binary's `modified` latch) -- a second
  PPC during the window no longer extends it.  Was a divergence.

Verified: Release links clean; surround boots + runs with the effect forced on,
every secondary MFD + the radar shear while the out-the-window view stays clean,
no crash (screenshot).  Open (for the playtesters who filed the report): live
PPC-fire confirmation + by-eye shear tuning -- k/roll are not recoverable from
the binary.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Cyd
2026-08-06 16:19:10 -05:00
co-authored by Claude Opus 4.8
parent 1164098d61
commit 74a0db4edd
7 changed files with 155 additions and 22 deletions
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game/reconstructed/mech.cpp
+26
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@@ -82,6 +82,7 @@
// The torso twist is reached via a BRIDGE (BTGetTorsoTwist, defined in torso.cpp)
// for the same reason.
#include "dmgtable.hpp"
#include <GAUGREND.hpp> // GaugeRenderer::SpecialEffect (virtual) -- PPC scramble trigger
extern Scalar BTGetTorsoTwist(Subsystem *torso); // torso.cpp (Torso complete there)
// heat-bank ambient bridge (heatfamily_reslice.cpp, AggregateHeatSink complete
// there) -- mech.cpp cannot include the subsystem headers (local-stub collision)
@@ -1122,6 +1123,31 @@ void
}
}
reportZone = message->damageZone; // post-resolve (@0x4a0396 write)
//
// @0x4a03f3 [T1] -- PPC/ERPPC SECONDARY-DISPLAY SCRAMBLE. EnergyDamageType
// (==4) is authored on exactly the 14 PPC/ERPPC subsystem records and nothing
// else, so this branch is structurally PPC-exclusive -- NO explicit weapon
// class check (the data authorship IS the gate). It sits OUTSIDE the burst
// loop below, so it fires ONCE per damage message, not per burst. The
// duration is DERIVED from the type ordinal, not a literal: (Scalar)4 * 0.2 ==
// 0.8s (binary loads long double 0.2 @0x4a0c08, fmulp). SpecialEffect ->
// L4GaugeRenderer scrambles every SECONDARY cockpit display (SVGA16 sync
// detune, FunkyVideo) for that window; the main 3D view is on an independent
// timing chain and is left clean. Spec: phases/phase-14-ppc-sync-distortion.md.
//
if (message->damageData.damageType == Damage::EnergyDamageType)
{
GaugeRenderer *gauges =
(application != 0) ? application->GetGaugeRenderer() : 0; // APP.h:355 -- named, not application+0x4c
if (gauges != 0) // the binary null-guards the renderer too (@0x4a0405)
gauges->SpecialEffect(GaugeRenderer::scrambleVideo,
(Scalar)message->damageData.damageType * 0.2f);
if (BTEnvOn("BT_DMG_LOG", 0))
DEBUG_STREAM << "[ppc-scramble] EnergyDamageType hit -> scrambleVideo for "
<< ((Scalar)message->damageData.damageType * 0.2f) << "s\n" << std::flush;
}
//
// #80 -- the faithful application loop (binary @0x4a0423-0x4a04d8), which
// REPLACES the engine-base single application. Three things the base