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fix #176: light pool tracked the camera via flood scoping - collect residents, anchor at player

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The seam-floor purple flicker was NOT a draw z-fight. The in-engine
[seam-*] probe (ACDREAM_PROBE_SEAMDRAW - built because RenderDoc cannot
capture this pipeline: it hides GL_ARB_bindless_texture and the
mandatory-modern startup gate throws; AMD GPU rules out Nsight) killed
every double-draw suspect: ONE shell instance per seam cell at the
lifted z, no floor-coincident entity (portal entities sit at z=-12.05),
zero portal depth fans in the sealed Hub. What it caught instead: the
corridor floor's applied light set flipping wholesale with the flood.

Root cause: c500912b scoped BuildPointLightSnapshot by the per-frame
portal flood, on the research doc's gloss of CEnvCell::visible_cell_table
as "the portal-flood visible set". The named decomp refutes the gloss:
add_visible_cell (0x0052de40) DBObj-LOADS absent cells and inserts them;
a cell activation adds itself + its whole dat visible-cell list
(0x0052e228/0x0052e24a); entries leave only via the flush machinery.
It is the RESIDENT-cell registry - gaze can never remove a cell.
add_dynamic_lights (0x0052d410) walks the WHOLE table per frame
(caller 0x00452d30), and insert_light (0x0054d1b0) caps the pool by
distance to Render::player_pos (0x0054d1dd). Retail's pool is a function
of player position only. Ours followed the camera: turning changed the
flood (probe: 8..41 cells across one turn), the six intensity-100
under-room portal purples entered/left the pool, and the wedge blinked.

Fix: BuildPointLightSnapshot(playerWorldPos) collects ALL registered
(=resident) lit lights; over cap keeps dynamics FIRST (retail's separate
7-slot dynamic pool never competes with statics) then nearest-the-player;
the RebuildScopedLights callback is deleted. Live-verified with the probe:
full-circle turn, flood churning 8..41, the floor set held the same 8
identities on every post-spawn frame. The purple wedge SHAPE stays - it
is cdb-proven retail-faithful.

Residual deviation (AP-85 rewritten): single 128 pool vs retail's
7-dynamic/40-static degrade-scaled dual pools - the Hub now shows
7 purples + viewer where retail's cdb showed 4 + viewer + fixture slots;
if the gate reads the wedge as too purple, the A7 dual-pool cap is the
faithful trim.

Pins: PointSnapshot_HubScaleLightCount_ObjectSelectionIsCameraInvariant
(rewritten to the corrected model),
PointSnapshot_OverCap_DynamicsNeverEvictedByNearerStatics,
PointSnapshot_OverCap_KeepsNearestThePlayer,
PointSnapshot_ResidentCollection_CellTagDoesNotFilter.
Suites: Core 2599+2skip / App 726+2skip / UI 425 / Net 385.

The [seam-*] probes stay until the visual gate passes, then strip.
Correction banner added to 2026-07-06-a7-per-cell-lighting-pseudocode.md;
outcome banner on the z-fight handoff; ISSUES #176 updated.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Erik 2026-07-06 15:12:31 +02:00
parent 8cb3176daa
commit d8984e877f
12 changed files with 525 additions and 194 deletions
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47
src/AcDream.App/Rendering/Wb/WbDrawDispatcher.cs
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@ -1111,6 +1111,15 @@ public sealed unsafe class WbDrawDispatcher : IDisposable
// ACDREAM_DUMP_ENTITY-targeted entities. Before the culled-continue
// so a routed-out entity still reports its state.
MaybeEmitEntityDump(entity, cacheLb, _currentEntityCulled);
// #176 seam-draw probe: any entity parented to a target cell reports
// its position + light set (a floor-coincident static/plate would be
// the z-fight's second draw; the player entity is the positive
// control). Before the culled-continue, like the dump above.
if (AcDream.Core.Rendering.RenderingDiagnostics.ProbeSeamDrawEnabled
&& entity.ParentCellId is { } seamPc
&& AcDream.Core.Rendering.RenderingDiagnostics.SeamDrawTargetCells.Contains(seamPc))
MaybeEmitSeamEnt(entity);
}
prevTupleEntityId = entity.Id;
@ -2075,6 +2084,44 @@ public sealed unsafe class WbDrawDispatcher : IDisposable
/// (AP-43) and docs/research/2026-06-19-lighting-a7-fixD-round2-*.
/// </para>
/// </summary>
// #176 seam-draw probe (ACDREAM_PROBE_SEAMDRAW) — throwaway apparatus. One
// [seam-ent] line per target-cell entity, re-emitted on state change: world
// position (F3 z — entities do NOT get the +0.02 shell lift), cull/slot,
// and the SelectForObject light set resolved to identities (owner-cell
// low16 + intensity). Sig dict is bounded by the handful of entities that
// ever live in the target cells.
private readonly Dictionary<ulong, string> _seamEntSigs = new();
private void MaybeEmitSeamEnt(WorldEntity entity)
{
var ci = System.Globalization.CultureInfo.InvariantCulture;
var snap = _pointSnapshot;
var sb = new System.Text.StringBuilder(200);
sb.AppendFormat(ci,
"guid=0x{0:X8} cell=0x{1:X8} pos=({2:F2},{3:F2},{4:F3}) culled={5} slot={6} indoor={7} L=[",
entity.ServerGuid, entity.ParentCellId ?? 0u,
entity.Position.X, entity.Position.Y, entity.Position.Z,
_currentEntityCulled ? 1 : 0, _currentEntitySlot, _currentEntityIndoor ? 1 : 0);
bool any = false;
for (int k = 0; k < _currentEntityLightSet.Length; k++)
{
int idx = _currentEntityLightSet[k];
if (idx < 0) continue;
if (any) sb.Append(',');
if (snap is not null && idx < snap.Count)
sb.AppendFormat(ci, "{0:X4}:I{1:F0}", snap[idx].CellId & 0xFFFFu, snap[idx].Intensity);
else
sb.Append('?').Append(idx);
any = true;
}
sb.Append(']');
string sig = sb.ToString();
if (_seamEntSigs.TryGetValue(entity.Id, out var prev) && prev == sig) return;
_seamEntSigs[entity.Id] = sig;
Console.WriteLine($"[seam-ent] t={Environment.TickCount64} {sig}");
}
private void ComputeEntityLightSet(WorldEntity entity)
{
// #142: set the indoor flag first so it's available even when the early-return