aboutsummaryrefslogtreecommitdiffstatshomepage
path: root/libraries/irrlicht-1.8.1/source/Irrlicht/Octree.h
blob: 2bb879d66c28e9bc99cf6753d338c8e76a30cb0b (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
// Copyright (C) 2002-2012 Nikolaus Gebhardt
// This file is part of the "Irrlicht Engine".
// For conditions of distribution and use, see copyright notice in irrlicht.h

#ifndef __C_OCTREE_H_INCLUDED__
#define __C_OCTREE_H_INCLUDED__

#include "SViewFrustum.h"
#include "S3DVertex.h"
#include "aabbox3d.h"
#include "irrArray.h"
#include "CMeshBuffer.h"

/**
	Flags for Octree
*/
//! use meshbuffer for drawing, enables VBO usage
#define OCTREE_USE_HARDWARE	false
//! use visibility information together with VBOs
#define OCTREE_USE_VISIBILITY true
//! use bounding box or frustum for calculate polys
#define OCTREE_BOX_BASED true
//! bypass full invisible/visible test
#define OCTREE_PARENTTEST

namespace irr
{

//! template octree.
/** T must be a vertex type which has a member
called .Pos, which is a core::vertex3df position. */
template <class T>
class Octree
{
public:

	struct SMeshChunk : public scene::CMeshBuffer<T>
	{
		SMeshChunk ()
			: scene::CMeshBuffer<T>(), MaterialId(0)
		{
			scene::CMeshBuffer<T>::grab();
		}

		virtual ~SMeshChunk ()
		{
			//removeAllHardwareBuffers
		}

		s32 MaterialId;
	};

	struct SIndexChunk
	{
		core::array<u16> Indices;
		s32 MaterialId;
	};

	struct SIndexData
	{
		u16* Indices;
		s32 CurrentSize;
		s32 MaxSize;
	};


	//! Constructor
	Octree(const core::array<SMeshChunk>& meshes, s32 minimalPolysPerNode=128) :
		IndexData(0), IndexDataCount(meshes.size()), NodeCount(0)
	{
		IndexData = new SIndexData[IndexDataCount];

		// construct array of all indices

		core::array<SIndexChunk>* indexChunks = new core::array<SIndexChunk>;
		indexChunks->reallocate(meshes.size());
		for (u32 i=0; i!=meshes.size(); ++i)
		{
			IndexData[i].CurrentSize = 0;
			IndexData[i].MaxSize = meshes[i].Indices.size();
			IndexData[i].Indices = new u16[IndexData[i].MaxSize];

			indexChunks->push_back(SIndexChunk());
			SIndexChunk& tic = indexChunks->getLast();

			tic.MaterialId = meshes[i].MaterialId;
			tic.Indices = meshes[i].Indices;
		}

		// create tree
		Root = new OctreeNode(NodeCount, 0, meshes, indexChunks, minimalPolysPerNode);
	}

	//! returns all ids of polygons partially or fully enclosed
	//! by this bounding box.
	void calculatePolys(const core::aabbox3d<f32>& box)
	{
		for (u32 i=0; i!=IndexDataCount; ++i)
			IndexData[i].CurrentSize = 0;

		Root->getPolys(box, IndexData, 0);
	}

	//! returns all ids of polygons partially or fully enclosed
	//! by a view frustum.
	void calculatePolys(const scene::SViewFrustum& frustum)
	{
		for (u32 i=0; i!=IndexDataCount; ++i)
			IndexData[i].CurrentSize = 0;

		Root->getPolys(frustum, IndexData, 0);
	}

	const SIndexData* getIndexData() const
	{
		return IndexData;
	}

	u32 getIndexDataCount() const
	{
		return IndexDataCount;
	}

	u32 getNodeCount() const
	{
		return NodeCount;
	}

	//! for debug purposes only, collects the bounding boxes of the tree
	void getBoundingBoxes(const core::aabbox3d<f32>& box,
		core::array< const core::aabbox3d<f32>* >&outBoxes) const
	{
		Root->getBoundingBoxes(box, outBoxes);
	}

	//! destructor
	~Octree()
	{
		for (u32 i=0; i<IndexDataCount; ++i)
			delete [] IndexData[i].Indices;

		delete [] IndexData;
		delete Root;
	}

private:
	// private inner class
	class OctreeNode
	{
	public:

		// constructor
		OctreeNode(u32& nodeCount, u32 currentdepth,
			const core::array<SMeshChunk>& allmeshdata,
			core::array<SIndexChunk>* indices,
			s32 minimalPolysPerNode) : IndexData(0),
			Depth(currentdepth+1)
		{
			++nodeCount;

			u32 i; // new ISO for scoping problem with different compilers

			for (i=0; i!=8; ++i)
				Children[i] = 0;

			if (indices->empty())
			{
				delete indices;
				return;
			}

			bool found = false;

			// find first point for bounding box

			for (i=0; i<indices->size(); ++i)
			{
				if (!(*indices)[i].Indices.empty())
				{
					Box.reset(allmeshdata[i].Vertices[(*indices)[i].Indices[0]].Pos);
					found = true;
					break;
				}
			}

			if (!found)
			{
				delete indices;
				return;
			}

			s32 totalPrimitives = 0;

			// now lets calculate our bounding box
			for (i=0; i<indices->size(); ++i)
			{
				totalPrimitives += (*indices)[i].Indices.size();
				for (u32 j=0; j<(*indices)[i].Indices.size(); ++j)
					Box.addInternalPoint(allmeshdata[i].Vertices[(*indices)[i].Indices[j]].Pos);
			}

			core::vector3df middle = Box.getCenter();
			core::vector3df edges[8];
			Box.getEdges(edges);

			// calculate all children
			core::aabbox3d<f32> box;
			core::array<u16> keepIndices;

			if (totalPrimitives > minimalPolysPerNode && !Box.isEmpty())
			for (u32 ch=0; ch!=8; ++ch)
			{
				box.reset(middle);
				box.addInternalPoint(edges[ch]);

				// create indices for child
				bool added = false;
				core::array<SIndexChunk>* cindexChunks = new core::array<SIndexChunk>;
				cindexChunks->reallocate(allmeshdata.size());
				for (i=0; i<allmeshdata.size(); ++i)
				{
					cindexChunks->push_back(SIndexChunk());
					SIndexChunk& tic = cindexChunks->getLast();
					tic.MaterialId = allmeshdata[i].MaterialId;

					for (u32 t=0; t<(*indices)[i].Indices.size(); t+=3)
					{
						if (box.isPointInside(allmeshdata[i].Vertices[(*indices)[i].Indices[t]].Pos) &&
							box.isPointInside(allmeshdata[i].Vertices[(*indices)[i].Indices[t+1]].Pos) &&
							box.isPointInside(allmeshdata[i].Vertices[(*indices)[i].Indices[t+2]].Pos))
						{
							tic.Indices.push_back((*indices)[i].Indices[t]);
							tic.Indices.push_back((*indices)[i].Indices[t+1]);
							tic.Indices.push_back((*indices)[i].Indices[t+2]);

							added = true;
						}
						else
						{
							keepIndices.push_back((*indices)[i].Indices[t]);
							keepIndices.push_back((*indices)[i].Indices[t+1]);
							keepIndices.push_back((*indices)[i].Indices[t+2]);
						}
					}

					(*indices)[i].Indices.set_used(keepIndices.size());
					memcpy( (*indices)[i].Indices.pointer(), keepIndices.pointer(), keepIndices.size()*sizeof(u16));
					keepIndices.set_used(0);
				}

				if (added)
					Children[ch] = new OctreeNode(nodeCount, Depth,
						allmeshdata, cindexChunks, minimalPolysPerNode);
				else
					delete cindexChunks;

			} // end for all possible children

			IndexData = indices;
		}

		// destructor
		~OctreeNode()
		{
			delete IndexData;

			for (u32 i=0; i<8; ++i)
				delete Children[i];
		}

		// returns all ids of polygons partially or full enclosed
		// by this bounding box.
		void getPolys(const core::aabbox3d<f32>& box, SIndexData* idxdata, u32 parentTest ) const
		{
#if defined (OCTREE_PARENTTEST )
			// if not full inside
			if ( parentTest != 2 )
			{
				// partially inside ?
				if (!Box.intersectsWithBox(box))
					return;

				// fully inside ?
				parentTest = Box.isFullInside(box)?2:1;
			}
#else
			if (Box.intersectsWithBox(box))
#endif
			{
				const u32 cnt = IndexData->size();
				u32 i; // new ISO for scoping problem in some compilers

				for (i=0; i<cnt; ++i)
				{
					const s32 idxcnt = (*IndexData)[i].Indices.size();

					if (idxcnt)
					{
						memcpy(&idxdata[i].Indices[idxdata[i].CurrentSize],
							&(*IndexData)[i].Indices[0], idxcnt * sizeof(s16));
						idxdata[i].CurrentSize += idxcnt;
					}
				}

				for (i=0; i!=8; ++i)
					if (Children[i])
						Children[i]->getPolys(box, idxdata,parentTest);
			}
		}

		// returns all ids of polygons partially or full enclosed
		// by the view frustum.
		void getPolys(const scene::SViewFrustum& frustum, SIndexData* idxdata,u32 parentTest) const
		{
			u32 i; // new ISO for scoping problem in some compilers

			// if parent is fully inside, no further check for the children is needed
#if defined (OCTREE_PARENTTEST )
			if ( parentTest != 2 )
#endif
			{
#if defined (OCTREE_PARENTTEST )
				parentTest = 2;
#endif
				for (i=0; i!=scene::SViewFrustum::VF_PLANE_COUNT; ++i)
				{
					core::EIntersectionRelation3D r = Box.classifyPlaneRelation(frustum.planes[i]);
					if ( r == core::ISREL3D_FRONT )
						return;
#if defined (OCTREE_PARENTTEST )
					if ( r == core::ISREL3D_CLIPPED )
						parentTest = 1;	// must still check children
#endif
				}
			}


			const u32 cnt = IndexData->size();

			for (i=0; i!=cnt; ++i)
			{
				s32 idxcnt = (*IndexData)[i].Indices.size();

				if (idxcnt)
				{
					memcpy(&idxdata[i].Indices[idxdata[i].CurrentSize],
						&(*IndexData)[i].Indices[0], idxcnt * sizeof(s16));
					idxdata[i].CurrentSize += idxcnt;
				}
			}

			for (i=0; i!=8; ++i)
				if (Children[i])
					Children[i]->getPolys(frustum, idxdata,parentTest);
		}

		//! for debug purposes only, collects the bounding boxes of the node
		void getBoundingBoxes(const core::aabbox3d<f32>& box,
			core::array< const core::aabbox3d<f32>* >&outBoxes) const
		{
			if (Box.intersectsWithBox(box))
			{
				outBoxes.push_back(&Box);

				for (u32 i=0; i!=8; ++i)
					if (Children[i])
						Children[i]->getBoundingBoxes(box, outBoxes);
			}
		}

	private:

		core::aabbox3df Box;
		core::array<SIndexChunk>* IndexData;
		OctreeNode* Children[8];
		u32 Depth;
	};

	OctreeNode* Root;
	SIndexData* IndexData;
	u32 IndexDataCount;
	u32 NodeCount;
};

} // end namespace

#endif