summaryrefslogtreecommitdiffhomepage
path: root/Opcode/OPC_Model.cpp
blob: 0616c4dd489f8d7b0a6e4340f29c5b82d0e653bc (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
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/*
 *	OPCODE - Optimized Collision Detection
 *	Copyright (C) 2001 Pierre Terdiman
 *	Homepage: http://www.codercorner.com/Opcode.htm
 */
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
 *	Contains code for OPCODE models.
 *	\file		OPC_Model.cpp
 *	\author		Pierre Terdiman
 *	\date		March, 20, 2001
 */
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
 *	The main collision wrapper, for all trees. Supported trees are:
 *	- Normal trees (2*N-1 nodes, full size)
 *	- No-leaf trees (N-1 nodes, full size)
 *	- Quantized trees (2*N-1 nodes, half size)
 *	- Quantized no-leaf trees (N-1 nodes, half size)
 *
 *	Usage:
 *
 *	1) Create a static mesh interface using callbacks or pointers. (see OPC_MeshInterface.cpp).
 *	Keep it around in your app, since a pointer to this interface is saved internally and
 *	used until you release the collision structures.
 *
 *	2) Build a Model using a creation structure:
 *
 *	\code
 *		Model Sample;
 *
 *		OPCODECREATE OPCC;
 *		OPCC.IMesh			= ...;
 *		OPCC.Rules			= ...;
 *		OPCC.NoLeaf			= ...;
 *		OPCC.Quantized		= ...;
 *		OPCC.KeepOriginal	= ...;
 *		bool Status = Sample.Build(OPCC);
 *	\endcode
 *
 *	3) Create a tree collider and set it up:
 *
 *	\code
 *		AABBTreeCollider TC;
 *		TC.SetFirstContact(...);
 *		TC.SetFullBoxBoxTest(...);
 *		TC.SetFullPrimBoxTest(...);
 *		TC.SetTemporalCoherence(...);
 *	\endcode
 *
 *	4) Perform a collision query
 *
 *	\code
 *		// Setup cache
 *		static BVTCache ColCache;
 *		ColCache.Model0 = &Model0;
 *		ColCache.Model1 = &Model1;
 *
 *		// Collision query
 *		bool IsOk = TC.Collide(ColCache, World0, World1);
 *
 *		// Get collision status => if true, objects overlap
 *		BOOL Status = TC.GetContactStatus();
 *
 *		// Number of colliding pairs and list of pairs
 *		udword NbPairs = TC.GetNbPairs();
 *		const Pair* p = TC.GetPairs()
 *	\endcode
 *
 *	5) Stats
 *
 *	\code
 *		Model0.GetUsedBytes()	= number of bytes used for this collision tree
 *		TC.GetNbBVBVTests()		= number of BV-BV overlap tests performed during last query
 *		TC.GetNbPrimPrimTests()	= number of Triangle-Triangle overlap tests performed during last query
 *		TC.GetNbBVPrimTests()	= number of Triangle-BV overlap tests performed during last query
 *	\endcode
 *
 *	\class		Model
 *	\author		Pierre Terdiman
 *	\version	1.3
 *	\date		March, 20, 2001
*/
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Precompiled Header
#include "Stdafx.h"

using namespace Opcode;

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
 *	Constructor.
 */
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
Model::Model()
{
#ifdef __MESHMERIZER_H__	// Collision hulls only supported within ICE !
	mHull	= null;
#endif // __MESHMERIZER_H__
}

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
 *	Destructor.
 */
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
Model::~Model()
{
	Release();
}

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
 *	Releases the model.
 */
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
void Model::Release()
{
	ReleaseBase();
#ifdef __MESHMERIZER_H__	// Collision hulls only supported within ICE !
	DELETESINGLE(mHull);
#endif // __MESHMERIZER_H__
}

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
 *	Builds a collision model.
 *	\param		create		[in] model creation structure
 *	\return		true if success
 */
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
bool Model::Build(const OPCODECREATE& create)
{
	// 1) Checkings
	if(!create.mIMesh || !create.mIMesh->IsValid())	return false;

	// For this model, we only support complete trees
	if(create.mSettings.mLimit!=1)	return SetIceError("OPCODE WARNING: supports complete trees only! Use mLimit = 1.\n", null);

	// Look for degenerate faces.
	udword NbDegenerate = create.mIMesh->CheckTopology();
	if(NbDegenerate)	Log("OPCODE WARNING: found %d degenerate faces in model! Collision might report wrong results!\n", NbDegenerate);
	// We continue nonetheless.... 

	Release();	// Make sure previous tree has been discarded [Opcode 1.3, thanks Adam]

	// 1-1) Setup mesh interface automatically [Opcode 1.3]
	SetMeshInterface(create.mIMesh);

	// Special case for 1-triangle meshes [Opcode 1.3]
	udword NbTris = create.mIMesh->GetNbTriangles();
	if(NbTris==1)
	{
		// We don't need to actually create a tree here, since we'll only have a single triangle to deal with anyway.
		// It's a waste to use a "model" for this but at least it will work.
		mModelCode |= OPC_SINGLE_NODE;
		return true;
	}

	// 2) Build a generic AABB Tree.
	mSource = new AABBTree;
	CHECKALLOC(mSource);

	// 2-1) Setup a builder. Our primitives here are triangles from input mesh,
	// so we use an AABBTreeOfTrianglesBuilder.....
	{
		AABBTreeOfTrianglesBuilder TB;
		TB.mIMesh			= create.mIMesh;
		TB.mSettings		= create.mSettings;
		TB.mNbPrimitives	= NbTris;
		if(!mSource->Build(&TB))	return false;
	}

	// 3) Create an optimized tree according to user-settings
	if(!CreateTree(create.mNoLeaf, create.mQuantized))	return false;

	// 3-2) Create optimized tree
	if(!mTree->Build(mSource))	return false;

	// 3-3) Delete generic tree if needed
	if(!create.mKeepOriginal)	DELETESINGLE(mSource);

#ifdef __MESHMERIZER_H__
	// 4) Convex hull
	if(create.mCollisionHull)
	{
		// Create hull
		mHull = new CollisionHull;
		CHECKALLOC(mHull);

		CONVEXHULLCREATE CHC;
		// ### doesn't work with strides
		CHC.NbVerts			= create.mIMesh->GetNbVertices();
		CHC.Vertices		= create.mIMesh->GetVerts();
		CHC.UnifyNormals	= true;
		CHC.ReduceVertices	= true;
		CHC.WordFaces		= false;
		mHull->Compute(CHC);
	}
#endif // __MESHMERIZER_H__

	return true;
}

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
/**
 *	Gets the number of bytes used by the tree.
 *	\return		amount of bytes used
 */
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
udword Model::GetUsedBytes() const
{
	if(!mTree)	return 0;
	return mTree->GetUsedBytes();
}