summaryrefslogtreecommitdiff
path: root/indra/newview/llvieweroctree.cpp
blob: 00a652384c189c66fa79f49a20a4be990f838d4c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
/** 
 * @file llvieweroctree.cpp
 * @brief LLViewerOctreeGroup class implementation and supporting functions
 *
 * $LicenseInfo:firstyear=2003&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#include "llviewerprecompiledheaders.h"
#include "llvieweroctree.h"
#include "llviewerregion.h"
#include "pipeline.h"
#include "llviewercontrol.h"
#include "llappviewer.h"
#include "llglslshader.h"
#include "llviewershadermgr.h"

//-----------------------------------------------------------------------------------
//static variables definitions
//-----------------------------------------------------------------------------------
U32 LLViewerOctreeEntryData::sCurVisible = 10; //reserve the low numbers for special use.
BOOL LLViewerOctreeDebug::sInDebug = FALSE;

static LLTrace::CountStatHandle<S32> sOcclusionQueries("occlusion_queries", "Number of occlusion queries executed"),
									 sNumObjectsOccluded("occluded_objects", "Count of objects being occluded by a query"),
									 sNumObjectsUnoccluded("unoccluded_objects", "Count of objects being unoccluded by a query");

//-----------------------------------------------------------------------------------
//some global functions definitions
//-----------------------------------------------------------------------------------
typedef enum
{
	b000 = 0x00,
	b001 = 0x01,
	b010 = 0x02,
	b011 = 0x03,
	b100 = 0x04,
	b101 = 0x05,
	b110 = 0x06,
	b111 = 0x07,
} eLoveTheBits;

//contact Runitai Linden for a copy of the SL object used to write this table
//basically, you give the table a bitmask of the look-at vector to a node and it
//gives you a triangle fan index array
static U16 sOcclusionIndices[] =
{
	 //000
		b111, b110, b010, b011, b001, b101, b100, b110,
	 //001 
		b011, b010, b000, b001, b101, b111, b110, b010,
	 //010
		b101, b100, b110, b111, b011, b001, b000, b100,
	 //011 
		b001, b000, b100, b101, b111, b011, b010, b000,
	 //100 
		b110, b000, b010, b011, b111, b101, b100, b000,
	 //101 
		b010, b100, b000, b001, b011, b111, b110, b100,
	 //110
		b100, b010, b110, b111, b101, b001, b000, b010,
	 //111
		b000, b110, b100, b101, b001, b011, b010, b110,
};

U32 get_box_fan_indices(LLCamera* camera, const LLVector4a& center)
{
	LLVector4a origin;
	origin.load3(camera->getOrigin().mV);

	S32 cypher = center.greaterThan(origin).getGatheredBits() & 0x7;
	
	return cypher*8;
}

U8* get_box_fan_indices_ptr(LLCamera* camera, const LLVector4a& center)
{
	LLVector4a origin;
	origin.load3(camera->getOrigin().mV);

	S32 cypher = center.greaterThan(origin).getGatheredBits() & 0x7;
	
	return (U8*) (sOcclusionIndices+cypher*8);
}

//create a vertex buffer for efficiently rendering cubes
LLVertexBuffer* ll_create_cube_vb(U32 type_mask, U32 usage)
{
	LLVertexBuffer* ret = new LLVertexBuffer(type_mask, usage);

	ret->allocateBuffer(8, 64, true);

	LLStrider<LLVector3> pos;
	LLStrider<U16> idx;

	ret->getVertexStrider(pos);
	ret->getIndexStrider(idx);

	pos[0] = LLVector3(-1,-1,-1);
	pos[1] = LLVector3(-1,-1, 1);
	pos[2] = LLVector3(-1, 1,-1);
	pos[3] = LLVector3(-1, 1, 1);
	pos[4] = LLVector3( 1,-1,-1);
	pos[5] = LLVector3( 1,-1, 1);
	pos[6] = LLVector3( 1, 1,-1);
	pos[7] = LLVector3( 1, 1, 1);

	for (U32 i = 0; i < 64; i++)
	{
		idx[i] = sOcclusionIndices[i];
	}

	ret->flush();

	return ret;
}


#define LL_TRACK_PENDING_OCCLUSION_QUERIES 0

const F32 SG_OCCLUSION_FUDGE = 0.25f;
#define SG_DISCARD_TOLERANCE 0.01f


S32 AABBSphereIntersect(const LLVector3& min, const LLVector3& max, const LLVector3 &origin, const F32 &rad)
{
	return AABBSphereIntersectR2(min, max, origin, rad*rad);
}

S32 AABBSphereIntersectR2(const LLVector3& min, const LLVector3& max, const LLVector3 &origin, const F32 &r)
{
	F32 d = 0.f;
	F32 t;
	
	if ((min-origin).magVecSquared() < r &&
		(max-origin).magVecSquared() < r)
	{
		return 2;
	}

	for (U32 i = 0; i < 3; i++)
	{
		if (origin.mV[i] < min.mV[i])
		{
			t = min.mV[i] - origin.mV[i];
			d += t*t;
		}
		else if (origin.mV[i] > max.mV[i])
		{
			t = origin.mV[i] - max.mV[i];
			d += t*t;
		}

		if (d > r)
		{
			return 0;
		}
	}

	return 1;
}


S32 AABBSphereIntersect(const LLVector4a& min, const LLVector4a& max, const LLVector3 &origin, const F32 &rad)
{
	return AABBSphereIntersectR2(min, max, origin, rad*rad);
}

S32 AABBSphereIntersectR2(const LLVector4a& min, const LLVector4a& max, const LLVector3 &origin, const F32 &r)
{
	F32 d = 0.f;
	F32 t;
	
	LLVector4a origina;
	origina.load3(origin.mV);

	LLVector4a v;
	v.setSub(min, origina);
	
	if (v.dot3(v) < r)
	{
		v.setSub(max, origina);
		if (v.dot3(v) < r)
		{
			return 2;
		}
	}


	for (U32 i = 0; i < 3; i++)
	{
		if (origin.mV[i] < min[i])
		{
			t = min[i] - origin.mV[i];
			d += t*t;
		}
		else if (origin.mV[i] > max[i])
		{
			t = origin.mV[i] - max[i];
			d += t*t;
		}

		if (d > r)
		{
			return 0;
		}
	}

	return 1;
}

//-----------------------------------------------------------------------------------
//class LLViewerOctreeEntry definitions
//-----------------------------------------------------------------------------------
LLViewerOctreeEntry::LLViewerOctreeEntry() 
:	LLTrace::MemTrackable<LLViewerOctreeEntry, 16>("LLViewerOctreeEntry"),
	mGroup(NULL),
	mBinRadius(0.f),
	mBinIndex(-1),
	mVisible(0)
{
	mPositionGroup.clear();
	mExtents[0].clear();
	mExtents[1].clear();	

	for(S32 i = 0; i < NUM_DATA_TYPE; i++)
	{
		mData[i] = NULL;
	}
}

LLViewerOctreeEntry::~LLViewerOctreeEntry()
{
	llassert(!mGroup);
}

void LLViewerOctreeEntry::addData(LLViewerOctreeEntryData* data)
{
	//llassert(mData[data->getDataType()] == NULL);	
	llassert(data != NULL);

	mData[data->getDataType()] = data;
}

void LLViewerOctreeEntry::removeData(LLViewerOctreeEntryData* data)
{
	//llassert(data->getDataType() != LLVOCACHEENTRY); //can not remove VOCache entry

	if(!mData[data->getDataType()])
	{
		return;
	}
	if(mData[data->getDataType()] != data)
	{
		return;
	}

	mData[data->getDataType()] = NULL;
	
	if(mGroup != NULL && !mData[LLDRAWABLE])
	{
		LLViewerOctreeGroup* group = mGroup;
		mGroup = NULL;
		group->removeFromGroup(data);

		llassert(mBinIndex == -1);				
	}
}

//called by group handleDestruction() ONLY when group is destroyed by octree.
void LLViewerOctreeEntry::nullGroup()
{
	mGroup = NULL;
}

void LLViewerOctreeEntry::setGroup(LLViewerOctreeGroup* group)
{
	if(mGroup == group)
	{
		return;
	}

	if(mGroup)
	{
		LLViewerOctreeGroup* old_group = mGroup;
		mGroup = NULL;
		old_group->removeFromGroup(this);

		llassert(mBinIndex == -1);
	}

	mGroup = group;
}

//-----------------------------------------------------------------------------------
//class LLViewerOctreeEntryData definitions
//-----------------------------------------------------------------------------------
LLViewerOctreeEntryData::~LLViewerOctreeEntryData()
{
	if(mEntry)
	{
		mEntry->removeData(this);
	}
}

LLViewerOctreeEntryData::LLViewerOctreeEntryData(LLViewerOctreeEntry::eEntryDataType_t data_type)
	: mDataType(data_type),
	  mEntry(NULL)
{
}

//virtual
void LLViewerOctreeEntryData::setOctreeEntry(LLViewerOctreeEntry* entry)
{
	llassert_always(mEntry.isNull());

	if(mEntry.notNull())
	{
		return; 
	}

	if(!entry)
	{
		mEntry = new LLViewerOctreeEntry();
	}
	else
	{
		mEntry = entry;
	}
	mEntry->addData(this);
}

void LLViewerOctreeEntryData::removeOctreeEntry()
{
	if(mEntry)
	{
		mEntry->removeData(this);
		mEntry = NULL;
	}
}

void LLViewerOctreeEntryData::setSpatialExtents(const LLVector3& min, const LLVector3& max)
{ 
	mEntry->mExtents[0].load3(min.mV); 
	mEntry->mExtents[1].load3(max.mV);
}

void LLViewerOctreeEntryData::setSpatialExtents(const LLVector4a& min, const LLVector4a& max)
{ 
	mEntry->mExtents[0] = min; 
	mEntry->mExtents[1] = max;
}

void LLViewerOctreeEntryData::setPositionGroup(const LLVector4a& pos)
{
	mEntry->mPositionGroup = pos;
}

const LLVector4a* LLViewerOctreeEntryData::getSpatialExtents() const 
{
	return mEntry->getSpatialExtents();
}

//virtual
void LLViewerOctreeEntryData::setGroup(LLViewerOctreeGroup* group)
{
	mEntry->setGroup(group);
}

void LLViewerOctreeEntryData::shift(const LLVector4a &shift_vector)
{
	mEntry->mExtents[0].add(shift_vector);
	mEntry->mExtents[1].add(shift_vector);
	mEntry->mPositionGroup.add(shift_vector);
}

LLViewerOctreeGroup* LLViewerOctreeEntryData::getGroup()const        
{
	return mEntry.notNull() ? mEntry->mGroup : NULL;
}

const LLVector4a& LLViewerOctreeEntryData::getPositionGroup() const  
{
	return mEntry->getPositionGroup();
}	

//virtual
bool LLViewerOctreeEntryData::isVisible() const
{
	if(mEntry)
	{
		return mEntry->mVisible == sCurVisible;
	}
	return false;
}

//virtual
bool LLViewerOctreeEntryData::isRecentlyVisible() const
{
	if(!mEntry)
	{
		return false;
	}

	if(isVisible())
	{
		return true;
	}
	if(getGroup() && getGroup()->isRecentlyVisible())
	{
		setVisible();
		return true;
	}

	return false;
}

void LLViewerOctreeEntryData::setVisible() const
{
	if(mEntry)
	{
		mEntry->mVisible = sCurVisible;
	}
}

void LLViewerOctreeEntryData::resetVisible() const
{
	if(mEntry)
	{
		mEntry->mVisible = 0;
	}
}
//-----------------------------------------------------------------------------------
//class LLViewerOctreeGroup definitions
//-----------------------------------------------------------------------------------

LLViewerOctreeGroup::~LLViewerOctreeGroup()
{
	//empty here
}

LLViewerOctreeGroup::LLViewerOctreeGroup(OctreeNode* node)
:	LLTrace::MemTrackable<LLViewerOctreeGroup, 16>("LLViewerOctreeGroup"),
	mOctreeNode(node),
	mAnyVisible(0),
	mState(CLEAN)
{
	LLVector4a tmp;
	tmp.splat(0.f);
	mExtents[0] = mExtents[1] = mObjectBounds[0] = mObjectBounds[1] =
		mObjectExtents[0] = mObjectExtents[1] = tmp;
	
	mBounds[0] = node->getCenter();
	mBounds[1] = node->getSize();

	mOctreeNode->addListener(this);
}

bool LLViewerOctreeGroup::hasElement(LLViewerOctreeEntryData* data) 
{ 
	if(!data->getEntry())
	{
		return false;
	}
	return std::find(getDataBegin(), getDataEnd(), data->getEntry()) != getDataEnd(); 
}

bool LLViewerOctreeGroup::removeFromGroup(LLViewerOctreeEntryData* data)
{
	return removeFromGroup(data->getEntry());
}

bool LLViewerOctreeGroup::removeFromGroup(LLViewerOctreeEntry* entry)
{
	llassert(entry != NULL);
	llassert(!entry->getGroup());
	
	if(isDead()) //group is about to be destroyed, not need to double delete the entry.
	{
		entry->setBinIndex(-1);
		return true;
	}

	unbound();
	setState(OBJECT_DIRTY);

	if (mOctreeNode)
	{
		if (!mOctreeNode->remove(entry)) //this could cause *this* pointer to be destroyed, so no more function calls after this.
		{
			OCT_ERRS << "Could not remove LLVOCacheEntry from LLVOCacheOctreeGroup" << LL_ENDL;
			return false;
		}
	}	

	return true;
}

//virtual 
void LLViewerOctreeGroup::unbound()
{
	if (isDirty())
	{
		return;
	}

	setState(DIRTY);
	
	//all the parent nodes need to rebound this child
	if (mOctreeNode)
	{
		OctreeNode* parent = (OctreeNode*) mOctreeNode->getParent();
		while (parent != NULL)
		{
			LLViewerOctreeGroup* group = (LLViewerOctreeGroup*) parent->getListener(0);
			if (!group || group->isDirty())
			{
				return;
			}
			
			group->setState(DIRTY);
			parent = (OctreeNode*) parent->getParent();
		}
	}
}
	
//virtual 
void LLViewerOctreeGroup::rebound()
{
	if (!isDirty())
	{	
		return;
	}
	
	if (mOctreeNode->getChildCount() == 1 && mOctreeNode->getElementCount() == 0)
	{
		LLViewerOctreeGroup* group = (LLViewerOctreeGroup*) mOctreeNode->getChild(0)->getListener(0);
		group->rebound();
		
		//copy single child's bounding box
		mBounds[0] = group->mBounds[0];
		mBounds[1] = group->mBounds[1];
		mExtents[0] = group->mExtents[0];
		mExtents[1] = group->mExtents[1];
		
		group->setState(SKIP_FRUSTUM_CHECK);
	}
	else if (mOctreeNode->isLeaf())
	{ //copy object bounding box if this is a leaf
		boundObjects(TRUE, mExtents[0], mExtents[1]);
		mBounds[0] = mObjectBounds[0];
		mBounds[1] = mObjectBounds[1];
	}
	else
	{
		LLVector4a& newMin = mExtents[0];
		LLVector4a& newMax = mExtents[1];
		LLViewerOctreeGroup* group = (LLViewerOctreeGroup*) mOctreeNode->getChild(0)->getListener(0);
		group->clearState(SKIP_FRUSTUM_CHECK);
		group->rebound();
		//initialize to first child
		newMin = group->mExtents[0];
		newMax = group->mExtents[1];

		//first, rebound children
		for (U32 i = 1; i < mOctreeNode->getChildCount(); i++)
		{
			group = (LLViewerOctreeGroup*) mOctreeNode->getChild(i)->getListener(0);
			group->clearState(SKIP_FRUSTUM_CHECK);
			group->rebound();
			const LLVector4a& max = group->mExtents[1];
			const LLVector4a& min = group->mExtents[0];

			newMax.setMax(newMax, max);
			newMin.setMin(newMin, min);
		}

		boundObjects(FALSE, newMin, newMax);
		
		mBounds[0].setAdd(newMin, newMax);
		mBounds[0].mul(0.5f);
		mBounds[1].setSub(newMax, newMin);
		mBounds[1].mul(0.5f);
	}
	
	clearState(DIRTY);

	return;
}

//virtual 
void LLViewerOctreeGroup::handleInsertion(const TreeNode* node, LLViewerOctreeEntry* obj)
{
	obj->setGroup(this);	
	unbound();
	setState(OBJECT_DIRTY);
}
	
//virtual 
void LLViewerOctreeGroup::handleRemoval(const TreeNode* node, LLViewerOctreeEntry* obj)
{
	unbound();
	setState(OBJECT_DIRTY);

	obj->setGroup(NULL); //this could cause *this* pointer to be destroyed. So no more function calls after this.	
}
	
//virtual 
void LLViewerOctreeGroup::handleDestruction(const TreeNode* node)
{
	for (OctreeNode::element_iter i = mOctreeNode->getDataBegin(); i != mOctreeNode->getDataEnd(); ++i)
	{
		LLViewerOctreeEntry* obj = *i;
		if (obj && obj->getGroup() == this)
		{
			obj->nullGroup();
			//obj->setGroup(NULL);
		}
	}
	mOctreeNode = NULL;
}
	
//virtual 
void LLViewerOctreeGroup::handleStateChange(const TreeNode* node)
{
	//drop bounding box upon state change
	if (mOctreeNode != node)
	{
		mOctreeNode = (OctreeNode*) node;
	}
	unbound();
}
	
//virtual 
void LLViewerOctreeGroup::handleChildAddition(const OctreeNode* parent, OctreeNode* child)
{
	if (child->getListenerCount() == 0)
	{
		new LLViewerOctreeGroup(child);
	}
	else
	{
		OCT_ERRS << "LLViewerOctreeGroup redundancy detected." << LL_ENDL;
	}

	unbound();
	
	((LLViewerOctreeGroup*)child->getListener(0))->unbound();
}
	
//virtual 
void LLViewerOctreeGroup::handleChildRemoval(const OctreeNode* parent, const OctreeNode* child)
{
	unbound();
}

LLViewerOctreeGroup* LLViewerOctreeGroup::getParent()
{
	if (isDead())
	{
		return NULL;
	}

	if(!mOctreeNode)
	{
		return NULL;
	}
	
	OctreeNode* parent = mOctreeNode->getOctParent();

	if (parent)
	{
		return (LLViewerOctreeGroup*) parent->getListener(0);
	}

	return NULL;
}

//virtual 
bool LLViewerOctreeGroup::boundObjects(BOOL empty, LLVector4a& minOut, LLVector4a& maxOut)
{
	const OctreeNode* node = mOctreeNode;

	if (node->isEmpty())
	{	//don't do anything if there are no objects
		if (empty && mOctreeNode->getParent())
		{	//only root is allowed to be empty
			OCT_ERRS << "Empty leaf found in octree." << LL_ENDL;
		}
		return false;
	}

	LLVector4a& newMin = mObjectExtents[0];
	LLVector4a& newMax = mObjectExtents[1];
	
	if (hasState(OBJECT_DIRTY))
	{ //calculate new bounding box
		clearState(OBJECT_DIRTY);

		//initialize bounding box to first element
		OctreeNode::const_element_iter i = node->getDataBegin();
		LLViewerOctreeEntry* entry = *i;
		const LLVector4a* minMax = entry->getSpatialExtents();

		newMin = minMax[0];
		newMax = minMax[1];

		for (++i; i != node->getDataEnd(); ++i)
		{
			entry = *i;
			minMax = entry->getSpatialExtents();
			
			update_min_max(newMin, newMax, minMax[0]);
			update_min_max(newMin, newMax, minMax[1]);
		}

		mObjectBounds[0].setAdd(newMin, newMax);
		mObjectBounds[0].mul(0.5f);
		mObjectBounds[1].setSub(newMax, newMin);
		mObjectBounds[1].mul(0.5f);
	}
	
	if (empty)
	{
		minOut = newMin;
		maxOut = newMax;
	}
	else
	{
		minOut.setMin(minOut, newMin);
		maxOut.setMax(maxOut, newMax);
	}
		
	return TRUE;
}

//virtual 
BOOL LLViewerOctreeGroup::isVisible() const
{
	return mVisible[LLViewerCamera::sCurCameraID] >= LLViewerOctreeEntryData::getCurrentFrame() ? TRUE : FALSE;
}

//virtual 
BOOL LLViewerOctreeGroup::isRecentlyVisible() const 
{
	return FALSE;
}

void LLViewerOctreeGroup::setVisible()
{
	mVisible[LLViewerCamera::sCurCameraID] = LLViewerOctreeEntryData::getCurrentFrame();
	
	if(LLViewerCamera::sCurCameraID < LLViewerCamera::CAMERA_WATER0)
	{
		mAnyVisible = LLViewerOctreeEntryData::getCurrentFrame();
	}
}

void LLViewerOctreeGroup::checkStates()
{
#if LL_OCTREE_PARANOIA_CHECK
	//LLOctreeStateCheck checker;
	//checker.traverse(mOctreeNode);
#endif
}

//-------------------------------------------------------------------------------------------
//occulsion culling functions and classes
//-------------------------------------------------------------------------------------------
std::set<U32> LLOcclusionCullingGroup::sPendingQueries;
class LLOcclusionQueryPool : public LLGLNamePool
{
public:
	LLOcclusionQueryPool()
	{
	}

protected:

	virtual GLuint allocateName()
	{
		GLuint ret = 0;

		glGenQueriesARB(1, &ret);
	
		return ret;
	}

	virtual void releaseName(GLuint name)
	{
#if LL_TRACK_PENDING_OCCLUSION_QUERIES
		LLOcclusionCullingGroup::sPendingQueries.erase(name);
#endif
		glDeleteQueriesARB(1, &name);
	}
};

static LLOcclusionQueryPool sQueryPool;
U32 LLOcclusionCullingGroup::getNewOcclusionQueryObjectName()
{
	return sQueryPool.allocate();
}

void LLOcclusionCullingGroup::releaseOcclusionQueryObjectName(GLuint name)
{
	sQueryPool.release(name);
}

//=====================================
//		Occlusion State Set/Clear
//=====================================
class LLSpatialSetOcclusionState : public OctreeTraveler
{
public:
	U32 mState;
	LLSpatialSetOcclusionState(U32 state) : mState(state) { }
	virtual void visit(const OctreeNode* branch) 
	{ 
		LLOcclusionCullingGroup* group = (LLOcclusionCullingGroup*)branch->getListener(0);
		if(group)
		{
			group->setOcclusionState(mState); 
		}
	}
};

class LLSpatialSetOcclusionStateDiff : public LLSpatialSetOcclusionState
{
public:
	LLSpatialSetOcclusionStateDiff(U32 state) : LLSpatialSetOcclusionState(state) { }

	virtual void traverse(const OctreeNode* n)
	{
		LLOcclusionCullingGroup* group = (LLOcclusionCullingGroup*) n->getListener(0);
		
		if (group && !group->isOcclusionState(mState))
		{
			OctreeTraveler::traverse(n);
		}
	}
};


LLOcclusionCullingGroup::LLOcclusionCullingGroup(OctreeNode* node, LLViewerOctreePartition* part) : 
	LLViewerOctreeGroup(node),
	mSpatialPartition(part)
{
	part->mLODSeed = (part->mLODSeed+1)%part->mLODPeriod;
	mLODHash = part->mLODSeed;

	OctreeNode* oct_parent = node->getOctParent();
	LLOcclusionCullingGroup* parent = oct_parent ? (LLOcclusionCullingGroup*) oct_parent->getListener(0) : NULL;

	for (U32 i = 0; i < LLViewerCamera::NUM_CAMERAS; i++)
	{
		mOcclusionQuery[i] = 0;
		mOcclusionIssued[i] = 0;
		mOcclusionState[i] = parent ? SG_STATE_INHERIT_MASK & parent->mOcclusionState[i] : 0;
		mVisible[i] = 0;
	}
}

LLOcclusionCullingGroup::~LLOcclusionCullingGroup()
{
	releaseOcclusionQueryObjectNames();
}

BOOL LLOcclusionCullingGroup::needsUpdate()
{
	return (LLDrawable::getCurrentFrame() % mSpatialPartition->mLODPeriod == mLODHash) ? TRUE : FALSE;
}

BOOL LLOcclusionCullingGroup::isRecentlyVisible() const
{
	const S32 MIN_VIS_FRAME_RANGE = 2;
	return (LLDrawable::getCurrentFrame() - mVisible[LLViewerCamera::sCurCameraID]) < MIN_VIS_FRAME_RANGE ;
}

BOOL LLOcclusionCullingGroup::isAnyRecentlyVisible() const
{
	const S32 MIN_VIS_FRAME_RANGE = 2;
	return (LLDrawable::getCurrentFrame() - mAnyVisible) < MIN_VIS_FRAME_RANGE ;
}

//virtual 
void LLOcclusionCullingGroup::handleChildAddition(const OctreeNode* parent, OctreeNode* child)
{
	if (child->getListenerCount() == 0)
	{
		new LLOcclusionCullingGroup(child, mSpatialPartition);
	}
	else
	{
		OCT_ERRS << "LLOcclusionCullingGroup redundancy detected." << LL_ENDL;
	}

	unbound();
	
	((LLViewerOctreeGroup*)child->getListener(0))->unbound();
}

void LLOcclusionCullingGroup::releaseOcclusionQueryObjectNames()
{
	if (gGLManager.mHasOcclusionQuery)
	{
		for (U32 i = 0; i < LLViewerCamera::NUM_CAMERAS; ++i)
		{
			if (mOcclusionQuery[i])
			{
				releaseOcclusionQueryObjectName(mOcclusionQuery[i]);
				mOcclusionQuery[i] = 0;
			}
		}
	}
}

void LLOcclusionCullingGroup::setOcclusionState(U32 state, S32 mode) 
{
	if (mode > STATE_MODE_SINGLE)
	{
		if (mode == STATE_MODE_DIFF)
		{
			LLSpatialSetOcclusionStateDiff setter(state);
			setter.traverse(mOctreeNode);
		}
		else if (mode == STATE_MODE_BRANCH)
		{
			LLSpatialSetOcclusionState setter(state);
			setter.traverse(mOctreeNode);
		}
		else
		{
			for (U32 i = 0; i < LLViewerCamera::NUM_CAMERAS; i++)
			{
				mOcclusionState[i] |= state;

				if ((state & DISCARD_QUERY) && mOcclusionQuery[i])
				{
					releaseOcclusionQueryObjectName(mOcclusionQuery[i]);
					mOcclusionQuery[i] = 0;
				}
			}
		}
	}
	else
	{
		if (state & OCCLUDED)
		{
			add(sNumObjectsOccluded, 1);
		}
		mOcclusionState[LLViewerCamera::sCurCameraID] |= state;
		if ((state & DISCARD_QUERY) && mOcclusionQuery[LLViewerCamera::sCurCameraID])
		{
			releaseOcclusionQueryObjectName(mOcclusionQuery[LLViewerCamera::sCurCameraID]);
			mOcclusionQuery[LLViewerCamera::sCurCameraID] = 0;
		}
	}
}

class LLSpatialClearOcclusionState : public OctreeTraveler
{
public:
	U32 mState;
	
	LLSpatialClearOcclusionState(U32 state) : mState(state) { }
	virtual void visit(const OctreeNode* branch) 
	{ 
		LLOcclusionCullingGroup* group = (LLOcclusionCullingGroup*)branch->getListener(0);
		if(group)
		{
			group->clearOcclusionState(mState); 
		}
	}
};

class LLSpatialClearOcclusionStateDiff : public LLSpatialClearOcclusionState
{
public:
	LLSpatialClearOcclusionStateDiff(U32 state) : LLSpatialClearOcclusionState(state) { }

	virtual void traverse(const OctreeNode* n)
	{
		LLOcclusionCullingGroup* group = (LLOcclusionCullingGroup*) n->getListener(0);
		
		if (group && group->isOcclusionState(mState))
		{
			OctreeTraveler::traverse(n);
		}
	}
};

void LLOcclusionCullingGroup::clearOcclusionState(U32 state, S32 mode)
{
	if (mode > STATE_MODE_SINGLE)
	{
		if (mode == STATE_MODE_DIFF)
		{
			LLSpatialClearOcclusionStateDiff clearer(state);
			clearer.traverse(mOctreeNode);
		}
		else if (mode == STATE_MODE_BRANCH)
		{
			LLSpatialClearOcclusionState clearer(state);
			clearer.traverse(mOctreeNode);
		}
		else
		{
			for (U32 i = 0; i < LLViewerCamera::NUM_CAMERAS; i++)
			{
				mOcclusionState[i] &= ~state;
			}
		}
	}
	else
	{
		if (state & OCCLUDED)
		{
			add(sNumObjectsUnoccluded, 1);
		}
		mOcclusionState[LLViewerCamera::sCurCameraID] &= ~state;
	}
}

static LLTrace::BlockTimerStatHandle FTM_OCCLUSION_READBACK("Readback Occlusion");
static LLTrace::BlockTimerStatHandle FTM_OCCLUSION_WAIT("Occlusion Wait");

BOOL LLOcclusionCullingGroup::earlyFail(LLCamera* camera, const LLVector4a* bounds)
{
	if (camera->getOrigin().isExactlyZero())
	{
		return FALSE;
	}

	const F32 vel = SG_OCCLUSION_FUDGE*2.f;
	LLVector4a fudge;
	fudge.splat(vel);

	const LLVector4a& c = bounds[0];
	LLVector4a r;
	r.setAdd(bounds[1], fudge);

	/*if (r.magVecSquared() > 1024.0*1024.0)
	{
		return TRUE;
	}*/

	LLVector4a e;
	e.load3(camera->getOrigin().mV);
	
	LLVector4a min;
	min.setSub(c,r);
	LLVector4a max;
	max.setAdd(c,r);
	
	S32 lt = e.lessThan(min).getGatheredBits() & 0x7;
	if (lt)
	{
		return FALSE;
	}

	S32 gt = e.greaterThan(max).getGatheredBits() & 0x7;
	if (gt)
	{
		return FALSE;
	}

	return TRUE;
}

U32 LLOcclusionCullingGroup::getLastOcclusionIssuedTime()
{
	return mOcclusionIssued[LLViewerCamera::sCurCameraID];
}

void LLOcclusionCullingGroup::checkOcclusion()
{
	if (LLPipeline::sUseOcclusion > 1)
	{
		LL_RECORD_BLOCK_TIME(FTM_OCCLUSION_READBACK);
		LLOcclusionCullingGroup* parent = (LLOcclusionCullingGroup*)getParent();
		if (parent && parent->isOcclusionState(LLOcclusionCullingGroup::OCCLUDED))
		{	//if the parent has been marked as occluded, the child is implicitly occluded
			clearOcclusionState(QUERY_PENDING | DISCARD_QUERY);
		}
		else if (isOcclusionState(QUERY_PENDING))
		{	//otherwise, if a query is pending, read it back

			GLuint available = 0;
			if (mOcclusionQuery[LLViewerCamera::sCurCameraID])
			{
				glGetQueryObjectuivARB(mOcclusionQuery[LLViewerCamera::sCurCameraID], GL_QUERY_RESULT_AVAILABLE_ARB, &available);

				static LLCachedControl<bool> wait_for_query(gSavedSettings, "RenderSynchronousOcclusion", true);

				if (wait_for_query && mOcclusionIssued[LLViewerCamera::sCurCameraID] < gFrameCount)
				{ //query was issued last frame, wait until it's available
					S32 max_loop = 1024;
					LL_RECORD_BLOCK_TIME(FTM_OCCLUSION_WAIT);
					while (!available && max_loop-- > 0)
					{
						//do some usefu work while we wait
						F32 max_time = llmin(gFrameIntervalSeconds.value()*10.f, 1.f);
						LLAppViewer::instance()->updateTextureThreads(max_time);
						
						glGetQueryObjectuivARB(mOcclusionQuery[LLViewerCamera::sCurCameraID], GL_QUERY_RESULT_AVAILABLE_ARB, &available);
					}
				}
			}
			else
			{
				available = 1;
			}

			if (available)
			{ //result is available, read it back, otherwise wait until next frame
				GLuint res = 1;
				if (!isOcclusionState(DISCARD_QUERY) && mOcclusionQuery[LLViewerCamera::sCurCameraID])
				{
					glGetQueryObjectuivARB(mOcclusionQuery[LLViewerCamera::sCurCameraID], GL_QUERY_RESULT_ARB, &res);	
#if LL_TRACK_PENDING_OCCLUSION_QUERIES
					sPendingQueries.erase(mOcclusionQuery[LLViewerCamera::sCurCameraID]);
#endif
				}
				else if (mOcclusionQuery[LLViewerCamera::sCurCameraID])
				{ //delete the query to avoid holding onto hundreds of pending queries
					releaseOcclusionQueryObjectName(mOcclusionQuery[LLViewerCamera::sCurCameraID]);
					mOcclusionQuery[LLViewerCamera::sCurCameraID] = 0;
				}
				
				if (isOcclusionState(DISCARD_QUERY))
				{
					res = 2;
				}

				if (res > 0)
				{
					assert_states_valid(this);
					clearOcclusionState(LLOcclusionCullingGroup::OCCLUDED, LLOcclusionCullingGroup::STATE_MODE_DIFF);
					assert_states_valid(this);
				}
				else
				{
					assert_states_valid(this);
					
					setOcclusionState(LLOcclusionCullingGroup::OCCLUDED, LLOcclusionCullingGroup::STATE_MODE_DIFF);
					
					assert_states_valid(this);
				}

				clearOcclusionState(QUERY_PENDING | DISCARD_QUERY);
			}
		}
		else if (mSpatialPartition->isOcclusionEnabled() && isOcclusionState(LLOcclusionCullingGroup::OCCLUDED))
		{	//check occlusion has been issued for occluded node that has not had a query issued
			assert_states_valid(this);
			clearOcclusionState(LLOcclusionCullingGroup::OCCLUDED, LLOcclusionCullingGroup::STATE_MODE_DIFF);
			assert_states_valid(this);
		}
	}
}

static LLTrace::BlockTimerStatHandle FTM_PUSH_OCCLUSION_VERTS("Push Occlusion");
static LLTrace::BlockTimerStatHandle FTM_SET_OCCLUSION_STATE("Occlusion State");
static LLTrace::BlockTimerStatHandle FTM_OCCLUSION_EARLY_FAIL("Occlusion Early Fail");
static LLTrace::BlockTimerStatHandle FTM_OCCLUSION_ALLOCATE("Allocate");
static LLTrace::BlockTimerStatHandle FTM_OCCLUSION_BUILD("Build");
static LLTrace::BlockTimerStatHandle FTM_OCCLUSION_BEGIN_QUERY("Begin Query");
static LLTrace::BlockTimerStatHandle FTM_OCCLUSION_END_QUERY("End Query");
static LLTrace::BlockTimerStatHandle FTM_OCCLUSION_SET_BUFFER("Set Buffer");
static LLTrace::BlockTimerStatHandle FTM_OCCLUSION_DRAW_WATER("Draw Water");
static LLTrace::BlockTimerStatHandle FTM_OCCLUSION_DRAW("Draw");

void LLOcclusionCullingGroup::doOcclusion(LLCamera* camera, const LLVector4a* shift)
{
	if (mSpatialPartition->isOcclusionEnabled() && LLPipeline::sUseOcclusion > 1)
	{
		//move mBounds to the agent space if necessary
		LLVector4a bounds[2];
		bounds[0] = mBounds[0];
		bounds[1] = mBounds[1];
		if(shift != NULL)
		{
			bounds[0].add(*shift);
		}

		F32 OCCLUSION_FUDGE_Z = SG_OCCLUSION_FUDGE; //<-- #Solution #2
		if (LLDrawPool::POOL_WATER == mSpatialPartition->mDrawableType)
		{
			OCCLUSION_FUDGE_Z = 1.;
		}

		// Don't cull hole/edge water, unless we have the GL_ARB_depth_clamp extension
		if (earlyFail(camera, bounds))
		{
			LL_RECORD_BLOCK_TIME(FTM_OCCLUSION_EARLY_FAIL);
			setOcclusionState(LLOcclusionCullingGroup::DISCARD_QUERY);
			assert_states_valid(this);
			clearOcclusionState(LLOcclusionCullingGroup::OCCLUDED, LLOcclusionCullingGroup::STATE_MODE_DIFF);
			assert_states_valid(this);
		}
		else
		{
			if (!isOcclusionState(QUERY_PENDING) || isOcclusionState(DISCARD_QUERY))
			{
				{ //no query pending, or previous query to be discarded
					LL_RECORD_BLOCK_TIME(FTM_RENDER_OCCLUSION);

					if (!mOcclusionQuery[LLViewerCamera::sCurCameraID])
					{
						LL_RECORD_BLOCK_TIME(FTM_OCCLUSION_ALLOCATE);
						mOcclusionQuery[LLViewerCamera::sCurCameraID] = getNewOcclusionQueryObjectName();
					}

					// Depth clamp all water to avoid it being culled as a result of being
					// behind the far clip plane, and in the case of edge water to avoid
					// it being culled while still visible.
					bool const use_depth_clamp = gGLManager.mHasDepthClamp &&
												(mSpatialPartition->mDrawableType == LLDrawPool::POOL_WATER ||						
												mSpatialPartition->mDrawableType == LLDrawPool::POOL_VOIDWATER);

					LLGLEnable clamp(use_depth_clamp ? GL_DEPTH_CLAMP : 0);				
						
#if !LL_DARWIN					
					U32 mode = gGLManager.mHasOcclusionQuery2 ? GL_ANY_SAMPLES_PASSED : GL_SAMPLES_PASSED_ARB;
#else
					U32 mode = GL_SAMPLES_PASSED_ARB;
#endif
					
#if LL_TRACK_PENDING_OCCLUSION_QUERIES
					sPendingQueries.insert(mOcclusionQuery[LLViewerCamera::sCurCameraID]);
#endif
					add(sOcclusionQueries, 1);

					{
						LL_RECORD_BLOCK_TIME(FTM_PUSH_OCCLUSION_VERTS);
						
						//store which frame this query was issued on
						mOcclusionIssued[LLViewerCamera::sCurCameraID] = gFrameCount;

						{
							LL_RECORD_BLOCK_TIME(FTM_OCCLUSION_BEGIN_QUERY);
							glBeginQueryARB(mode, mOcclusionQuery[LLViewerCamera::sCurCameraID]);					
						}
					
						LLGLSLShader* shader = LLGLSLShader::sCurBoundShaderPtr;
						llassert(shader);

						shader->uniform3fv(LLShaderMgr::BOX_CENTER, 1, bounds[0].getF32ptr());
						shader->uniform3f(LLShaderMgr::BOX_SIZE, bounds[1][0]+SG_OCCLUSION_FUDGE, 
																 bounds[1][1]+SG_OCCLUSION_FUDGE, 
																 bounds[1][2]+OCCLUSION_FUDGE_Z);

						if (!use_depth_clamp && mSpatialPartition->mDrawableType == LLDrawPool::POOL_VOIDWATER)
						{
							LL_RECORD_BLOCK_TIME(FTM_OCCLUSION_DRAW_WATER);

							LLGLSquashToFarClip squash(glh_get_current_projection(), 1);
							if (camera->getOrigin().isExactlyZero())
							{ //origin is invalid, draw entire box
								gPipeline.mCubeVB->drawRange(LLRender::TRIANGLE_FAN, 0, 7, 8, 0);
								gPipeline.mCubeVB->drawRange(LLRender::TRIANGLE_FAN, 0, 7, 8, b111*8);
							}
							else
							{
								gPipeline.mCubeVB->drawRange(LLRender::TRIANGLE_FAN, 0, 7, 8, get_box_fan_indices(camera, bounds[0]));
							}
						}
						else
						{
							LL_RECORD_BLOCK_TIME(FTM_OCCLUSION_DRAW);
							if (camera->getOrigin().isExactlyZero())
							{ //origin is invalid, draw entire box
								gPipeline.mCubeVB->drawRange(LLRender::TRIANGLE_FAN, 0, 7, 8, 0);
								gPipeline.mCubeVB->drawRange(LLRender::TRIANGLE_FAN, 0, 7, 8, b111*8);
							}
							else
							{
								gPipeline.mCubeVB->drawRange(LLRender::TRIANGLE_FAN, 0, 7, 8, get_box_fan_indices(camera, bounds[0]));
							}
						}


						{
							LL_RECORD_BLOCK_TIME(FTM_OCCLUSION_END_QUERY);
							glEndQueryARB(mode);
						}
					}
				}

				{
					LL_RECORD_BLOCK_TIME(FTM_SET_OCCLUSION_STATE);
					setOcclusionState(LLOcclusionCullingGroup::QUERY_PENDING);
					clearOcclusionState(LLOcclusionCullingGroup::DISCARD_QUERY);
				}
			}
		}
	}
}
//-------------------------------------------------------------------------------------------
//end of occulsion culling functions and classes
//-------------------------------------------------------------------------------------------

//-----------------------------------------------------------------------------------
//class LLViewerOctreePartition definitions
//-----------------------------------------------------------------------------------
LLViewerOctreePartition::LLViewerOctreePartition() : 
	mRegionp(NULL), 
	mOcclusionEnabled(TRUE), 
	mDrawableType(0),
	mLODSeed(0),
	mLODPeriod(1)
{
	LLVector4a center, size;
	center.splat(0.f);
	size.splat(1.f);

	mOctree = new OctreeRoot(center,size, NULL);
}
	
LLViewerOctreePartition::~LLViewerOctreePartition()
{
	delete mOctree;
	mOctree = NULL;
}

BOOL LLViewerOctreePartition::isOcclusionEnabled()
{
	return mOcclusionEnabled || LLPipeline::sUseOcclusion > 2;
}

//-----------------------------------------------------------------------------------
//class LLViewerOctreeCull definitions
//-----------------------------------------------------------------------------------

//virtual 
bool LLViewerOctreeCull::earlyFail(LLViewerOctreeGroup* group)
{	
	return false;
}
	
//virtual 
void LLViewerOctreeCull::traverse(const OctreeNode* n)
{
	LLViewerOctreeGroup* group = (LLViewerOctreeGroup*) n->getListener(0);

	if (earlyFail(group))
	{
		return;
	}
		
	if (mRes == 2 || 
		(mRes && group->hasState(LLViewerOctreeGroup::SKIP_FRUSTUM_CHECK)))
	{	//fully in, just add everything
		OctreeTraveler::traverse(n);
	}
	else
	{
		mRes = frustumCheck(group);
				
		if (mRes)
		{ //at least partially in, run on down
			OctreeTraveler::traverse(n);
		}

		mRes = 0;
	}
}
	
//------------------------------------------
//agent space group culling
S32 LLViewerOctreeCull::AABBInFrustumNoFarClipGroupBounds(const LLViewerOctreeGroup* group)
{
	return mCamera->AABBInFrustumNoFarClip(group->mBounds[0], group->mBounds[1]);
}

S32 LLViewerOctreeCull::AABBSphereIntersectGroupExtents(const LLViewerOctreeGroup* group)
{
	return AABBSphereIntersect(group->mExtents[0], group->mExtents[1], mCamera->getOrigin(), mCamera->mFrustumCornerDist);
}

S32 LLViewerOctreeCull::AABBInFrustumGroupBounds(const LLViewerOctreeGroup* group)
{
	return mCamera->AABBInFrustum(group->mBounds[0], group->mBounds[1]);
}
//------------------------------------------

//------------------------------------------
//agent space object set culling
S32 LLViewerOctreeCull::AABBInFrustumNoFarClipObjectBounds(const LLViewerOctreeGroup* group)
{
	return mCamera->AABBInFrustumNoFarClip(group->mObjectBounds[0], group->mObjectBounds[1]);
}

S32 LLViewerOctreeCull::AABBSphereIntersectObjectExtents(const LLViewerOctreeGroup* group)
{
	return AABBSphereIntersect(group->mObjectExtents[0], group->mObjectExtents[1], mCamera->getOrigin(), mCamera->mFrustumCornerDist);
}

S32 LLViewerOctreeCull::AABBInFrustumObjectBounds(const LLViewerOctreeGroup* group)
{
	return mCamera->AABBInFrustum(group->mObjectBounds[0], group->mObjectBounds[1]);
}
//------------------------------------------

//------------------------------------------
//local regional space group culling
S32 LLViewerOctreeCull::AABBInRegionFrustumNoFarClipGroupBounds(const LLViewerOctreeGroup* group)
{
	return mCamera->AABBInRegionFrustumNoFarClip(group->mBounds[0], group->mBounds[1]);
}

S32 LLViewerOctreeCull::AABBInRegionFrustumGroupBounds(const LLViewerOctreeGroup* group)
{
	return mCamera->AABBInRegionFrustum(group->mBounds[0], group->mBounds[1]);
}

S32 LLViewerOctreeCull::AABBRegionSphereIntersectGroupExtents(const LLViewerOctreeGroup* group, const LLVector3& shift)
{
	return AABBSphereIntersect(group->mExtents[0], group->mExtents[1], mCamera->getOrigin() - shift, mCamera->mFrustumCornerDist);
}
//------------------------------------------

//------------------------------------------
//local regional space object culling
S32 LLViewerOctreeCull::AABBInRegionFrustumObjectBounds(const LLViewerOctreeGroup* group)
{
	return mCamera->AABBInRegionFrustum(group->mObjectBounds[0], group->mObjectBounds[1]);
}

S32 LLViewerOctreeCull::AABBInRegionFrustumNoFarClipObjectBounds(const LLViewerOctreeGroup* group)
{
	return mCamera->AABBInRegionFrustumNoFarClip(group->mObjectBounds[0], group->mObjectBounds[1]);
}

S32 LLViewerOctreeCull::AABBRegionSphereIntersectObjectExtents(const LLViewerOctreeGroup* group, const LLVector3& shift)
{
	return AABBSphereIntersect(group->mObjectExtents[0], group->mObjectExtents[1], mCamera->getOrigin() - shift, mCamera->mFrustumCornerDist);
}
//------------------------------------------
//check if the objects projection large enough

bool LLViewerOctreeCull::checkProjectionArea(const LLVector4a& center, const LLVector4a& size, const LLVector3& shift, F32 pixel_threshold, F32 near_radius)
{	
	LLVector3 local_orig = mCamera->getOrigin() - shift;
	LLVector4a origin;
	origin.load3(local_orig.mV);

	LLVector4a lookAt;
	lookAt.setSub(center, origin);
	F32 distance = lookAt.getLength3().getF32();
	if(distance <= near_radius)
	{
		return true; //always load close-by objects
	}

	// treat object as if it were near_radius meters closer than it actually was.
	// this allows us to get some temporal coherence on visibility...objects that can be reached quickly will tend to be visible
	distance -= near_radius;

	F32 squared_rad = size.dot3(size).getF32();
	return squared_rad / distance > pixel_threshold;
}

//virtual 
bool LLViewerOctreeCull::checkObjects(const OctreeNode* branch, const LLViewerOctreeGroup* group)
{
	if (branch->getElementCount() == 0) //no elements
	{
		return false;
	}
	else if (branch->getChildCount() == 0) //leaf state, already checked tightest bounding box
	{
		return true;
	}
	else if (mRes == 1 && !frustumCheckObjects(group)) //no objects in frustum
	{
		return false;
	}
		
	return true;
}

//virtual 
void LLViewerOctreeCull::preprocess(LLViewerOctreeGroup* group)
{		
}
	
//virtual 
void LLViewerOctreeCull::processGroup(LLViewerOctreeGroup* group)
{
}
	
//virtual 
void LLViewerOctreeCull::visit(const OctreeNode* branch) 
{	
	LLViewerOctreeGroup* group = (LLViewerOctreeGroup*) branch->getListener(0);

	preprocess(group);
		
	if (checkObjects(branch, group))
	{
		processGroup(group);
	}
}

//--------------------------------------------------------------
//class LLViewerOctreeDebug
//virtual 
void LLViewerOctreeDebug::visit(const OctreeNode* branch)
{
#if 0
	LL_INFOS() << "Node: " << (U32)branch << " # Elements: " << branch->getElementCount() << " # Children: " << branch->getChildCount() << LL_ENDL;
	for (U32 i = 0; i < branch->getChildCount(); i++)
	{
		LL_INFOS() << "Child " << i << " : " << (U32)branch->getChild(i) << LL_ENDL;
	}
#endif
	LLViewerOctreeGroup* group = (LLViewerOctreeGroup*) branch->getListener(0);
	processGroup(group);	
}

//virtual 
void LLViewerOctreeDebug::processGroup(LLViewerOctreeGroup* group)
{
#if 0
	const LLVector4a* vec4 = group->getBounds();
	LLVector3 vec[2];
	vec[0].set(vec4[0].getF32ptr());
	vec[1].set(vec4[1].getF32ptr());
	LL_INFOS() << "Bounds: " << vec[0] << " : " << vec[1] << LL_ENDL;

	vec4 = group->getExtents();
	vec[0].set(vec4[0].getF32ptr());
	vec[1].set(vec4[1].getF32ptr());
	LL_INFOS() << "Extents: " << vec[0] << " : " << vec[1] << LL_ENDL;

	vec4 = group->getObjectBounds();
	vec[0].set(vec4[0].getF32ptr());
	vec[1].set(vec4[1].getF32ptr());
	LL_INFOS() << "ObjectBounds: " << vec[0] << " : " << vec[1] << LL_ENDL;

	vec4 = group->getObjectExtents();
	vec[0].set(vec4[0].getF32ptr());
	vec[1].set(vec4[1].getF32ptr());
	LL_INFOS() << "ObjectExtents: " << vec[0] << " : " << vec[1] << LL_ENDL;
#endif
}
//--------------------------------------------------------------