From 9f61c9e6ac6b1ac5692cf6352d2ebbd47a31a686 Mon Sep 17 00:00:00 2001
From: claude-bot <claude@ancap.in.ua>
Date: Mon, 13 Jul 2026 12:27:07 +0000
Subject: Import Cai1Hsu/re3 @ miami (reVC / GTA:VC decompilation)

Snapshot import (no upstream history) into git.ancap.in.ua/claude, per @lzcnt.
Source: https://github.com/Cai1Hsu/re3 branch miami.
---
 src/core/ZoneCull.cpp | 172 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 172 insertions(+)
 create mode 100644 src/core/ZoneCull.cpp

(limited to 'src/core/ZoneCull.cpp')

diff --git a/src/core/ZoneCull.cpp b/src/core/ZoneCull.cpp
new file mode 100644
index 0000000..db3577a
--- /dev/null
+++ b/src/core/ZoneCull.cpp
@@ -0,0 +1,172 @@
+#include "common.h"
+
+#include "Building.h"
+#include "Treadable.h"
+#include "Train.h"
+#include "Pools.h"
+#include "Timer.h"
+#include "Camera.h"
+#include "World.h"
+#include "FileMgr.h"
+#include "ZoneCull.h"
+#include "Zones.h"
+
+int32     CCullZones::NumAttributeZones;
+CAttributeZone CCullZones::aAttributeZones[NUMATTRIBZONES];
+
+int32 CCullZones::CurrentWantedLevelDrop_Player;
+int32 CCullZones::CurrentFlags_Camera;
+int32 CCullZones::CurrentFlags_Player;
+bool CCullZones::bCurrentSubwayIsInvisible;
+bool CCullZones::bAtBeachForAudio;
+
+void
+CCullZones::Init(void)
+{
+	NumAttributeZones = 0;
+	CurrentWantedLevelDrop_Player = 0;
+	CurrentFlags_Camera = 0;
+	CurrentFlags_Player = 0;
+	bCurrentSubwayIsInvisible = false;
+}
+
+void
+CCullZones::Update(void)
+{
+	bool invisible;
+
+	switch(CTimer::GetFrameCounter() & 7){
+	case 0:
+	case 4:
+		UpdateAtBeachForAudio();
+		break;
+
+	case 2:
+		/* Update camera attributes */
+		CurrentFlags_Camera = FindAttributesForCoors(TheCamera.GetGameCamPosition(), nil);
+		invisible = (CurrentFlags_Camera & ATTRZONE_SUBWAYVISIBLE) == 0;
+		if(invisible != bCurrentSubwayIsInvisible){
+			MarkSubwayAsInvisible(!invisible);
+			bCurrentSubwayIsInvisible = invisible;
+		}
+		break;
+
+	case 6:
+		/* Update player attributes */
+		CurrentFlags_Player = FindAttributesForCoors(FindPlayerCoors(),
+			&CurrentWantedLevelDrop_Player);
+		break;
+	}
+}
+
+// TODO? put somewhere else?
+bool
+IsPointWithinArbitraryArea(float px, float py, float x1, float y1, float x2, float y2, float x3, float y3, float x4, float y4)
+{
+	if((px-x1)*(x2-x1) - (py-y1)*(y2-y1) < 0.0f) return false;
+	if((px-x2)*(x3-x2) - (py-y2)*(y3-y2) < 0.0f) return false;
+	if((px-x3)*(x4-x3) - (py-y3)*(y4-y3) < 0.0f) return false;
+	if((px-x4)*(x1-x4) - (py-y4)*(y1-y4) < 0.0f) return false;
+	return true;
+}
+
+void
+CCullZones::UpdateAtBeachForAudio(void)
+{
+	bAtBeachForAudio = IsPointWithinArbitraryArea(TheCamera.GetPosition().x, TheCamera.GetPosition().y,
+		400.0f, -1644.4f,
+		751.9f, 1267.8f,
+		971.9f, 1216.2f,
+		840.0f, -1744.0f);
+}
+
+void
+CCullZones::ForceCullZoneCoors(CVector coors)
+{
+}
+
+int32
+CCullZones::FindAttributesForCoors(CVector coors, int32 *wantedLevel)
+{
+	int i;
+	int32 attribs;
+
+	if (wantedLevel)
+		*wantedLevel = 0;
+	attribs = 0;
+	for(i = 0; i < NumAttributeZones; i++)
+		if(coors.x >= aAttributeZones[i].minx && coors.x <= aAttributeZones[i].maxx &&
+		   coors.y >= aAttributeZones[i].miny && coors.y <= aAttributeZones[i].maxy &&
+		   coors.z >= aAttributeZones[i].minz && coors.z <= aAttributeZones[i].maxz){
+			attribs |= aAttributeZones[i].attributes;
+			if(wantedLevel)
+				*wantedLevel = Max(*wantedLevel, aAttributeZones[i].wantedLevel);
+		}
+	return attribs;
+}
+
+CAttributeZone*
+CCullZones::FindZoneWithStairsAttributeForPlayer(void)
+{
+	int i;
+	CVector coors;
+
+	coors = FindPlayerCoors();
+	for(i = 0; i < NumAttributeZones; i++)
+		if(aAttributeZones[i].attributes & ATTRZONE_STAIRS &&
+		   coors.x >= aAttributeZones[i].minx && coors.x <= aAttributeZones[i].maxx &&
+		   coors.y >= aAttributeZones[i].miny && coors.y <= aAttributeZones[i].maxy &&
+		   coors.z >= aAttributeZones[i].minz && coors.z <= aAttributeZones[i].maxz)
+			return &aAttributeZones[i];
+	return nil;
+}
+
+void
+CCullZones::MarkSubwayAsInvisible(bool visible)
+{
+	int i, n;
+	CEntity *e;
+	CVehicle *v;
+
+	n = CPools::GetBuildingPool()->GetSize()-1;
+	for(i = n; i >= 0; i--){
+		e = CPools::GetBuildingPool()->GetSlot(i);
+		if(e && e->bIsSubway)
+			e->bIsVisible = visible;
+	}
+
+	n = CPools::GetTreadablePool()->GetSize()-1;
+	for(i = n; i >= 0; i--){
+		e = CPools::GetTreadablePool()->GetSlot(i);
+		if(e && e->bIsSubway)
+			e->bIsVisible = visible;
+	}
+
+	n = CPools::GetVehiclePool()->GetSize()-1;
+	for(i = n; i >= 0; i--){
+		v = CPools::GetVehiclePool()->GetSlot(i);
+		if(v && v->IsTrain() && ((CTrain*)v)->m_nTrackId != TRACK_ELTRAIN)
+			v->bIsVisible = visible;
+	}
+}
+
+void
+CCullZones::AddCullZone(CVector const &position,
+                        float minx, float maxx,
+                        float miny, float maxy,
+                        float minz, float maxz,
+                        uint16 flag, int16 wantedLevel)
+{
+	CAttributeZone *attrib;
+
+	assert(NumAttributeZones < NUMATTRIBZONES);
+	attrib = &aAttributeZones[NumAttributeZones++];
+	attrib->minx = minx;
+	attrib->maxx = maxx;
+	attrib->miny = miny;
+	attrib->maxy = maxy;
+	attrib->minz = minz;
+	attrib->maxz = maxz;
+	attrib->attributes = flag;
+	attrib->wantedLevel = wantedLevel;
+}
-- 
cgit v1.2.3