1 /*
2 Bullet Continuous Collision Detection and Physics Library
3 Copyright (c) 2003-2006 Erwin Coumans  http://continuousphysics.com/Bullet/
4 
5 This software is provided 'as-is', without any express or implied warranty.
6 In no event will the authors be held liable for any damages arising from the use of this software.
7 Permission is granted to anyone to use this software for any purpose,
8 including commercial applications, and to alter it and redistribute it freely,
9 subject to the following restrictions:
10 
11 1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
12 2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
13 3. This notice may not be removed or altered from any source distribution.
14 */
15 
16 #ifndef BT_SOFT_BODY_SOLVER_VERTEX_BUFFER_H
17 #define BT_SOFT_BODY_SOLVER_VERTEX_BUFFER_H
18 
19 
20 class btVertexBufferDescriptor
21 {
22 public:
23 	enum BufferTypes
24 	{
25 		CPU_BUFFER,
26 		DX11_BUFFER,
27 		OPENGL_BUFFER
28 	};
29 
30 protected:
31 
32 	bool m_hasVertexPositions;
33 	bool m_hasNormals;
34 
35 	int m_vertexOffset;
36 	int m_vertexStride;
37 
38 	int m_normalOffset;
39 	int m_normalStride;
40 
41 public:
btVertexBufferDescriptor()42 	btVertexBufferDescriptor()
43 	{
44 		m_hasVertexPositions = false;
45 		m_hasNormals = false;
46 		m_vertexOffset = 0;
47 		m_vertexStride = 0;
48 		m_normalOffset = 0;
49 		m_normalStride = 0;
50 	}
51 
~btVertexBufferDescriptor()52 	virtual ~btVertexBufferDescriptor()
53 	{
54 
55 	}
56 
hasVertexPositions()57 	virtual bool hasVertexPositions() const
58 	{
59 		return m_hasVertexPositions;
60 	}
61 
hasNormals()62 	virtual bool hasNormals() const
63 	{
64 		return m_hasNormals;
65 	}
66 
67 	/**
68 	 * Return the type of the vertex buffer descriptor.
69 	 */
70 	virtual BufferTypes getBufferType() const = 0;
71 
72 	/**
73 	 * Return the vertex offset in floats from the base pointer.
74 	 */
getVertexOffset()75 	virtual int getVertexOffset() const
76 	{
77 		return m_vertexOffset;
78 	}
79 
80 	/**
81 	 * Return the vertex stride in number of floats between vertices.
82 	 */
getVertexStride()83 	virtual int getVertexStride() const
84 	{
85 		return m_vertexStride;
86 	}
87 
88 	/**
89 	 * Return the vertex offset in floats from the base pointer.
90 	 */
getNormalOffset()91 	virtual int getNormalOffset() const
92 	{
93 		return m_normalOffset;
94 	}
95 
96 	/**
97 	 * Return the vertex stride in number of floats between vertices.
98 	 */
getNormalStride()99 	virtual int getNormalStride() const
100 	{
101 		return m_normalStride;
102 	}
103 };
104 
105 
106 class btCPUVertexBufferDescriptor : public btVertexBufferDescriptor
107 {
108 protected:
109 	float *m_basePointer;
110 
111 public:
112 	/**
113 	 * vertexBasePointer is pointer to beginning of the buffer.
114 	 * vertexOffset is the offset in floats to the first vertex.
115 	 * vertexStride is the stride in floats between vertices.
116 	 */
btCPUVertexBufferDescriptor(float * basePointer,int vertexOffset,int vertexStride)117 	btCPUVertexBufferDescriptor( float *basePointer, int vertexOffset, int vertexStride )
118 	{
119 		m_basePointer = basePointer;
120 		m_vertexOffset = vertexOffset;
121 		m_vertexStride = vertexStride;
122 		m_hasVertexPositions = true;
123 	}
124 
125 	/**
126 	 * vertexBasePointer is pointer to beginning of the buffer.
127 	 * vertexOffset is the offset in floats to the first vertex.
128 	 * vertexStride is the stride in floats between vertices.
129 	 */
btCPUVertexBufferDescriptor(float * basePointer,int vertexOffset,int vertexStride,int normalOffset,int normalStride)130 	btCPUVertexBufferDescriptor( float *basePointer, int vertexOffset, int vertexStride, int normalOffset, int normalStride )
131 	{
132 		m_basePointer = basePointer;
133 
134 		m_vertexOffset = vertexOffset;
135 		m_vertexStride = vertexStride;
136 		m_hasVertexPositions = true;
137 
138 		m_normalOffset = normalOffset;
139 		m_normalStride = normalStride;
140 		m_hasNormals = true;
141 	}
142 
~btCPUVertexBufferDescriptor()143 	virtual ~btCPUVertexBufferDescriptor()
144 	{
145 
146 	}
147 
148 	/**
149 	 * Return the type of the vertex buffer descriptor.
150 	 */
getBufferType()151 	virtual BufferTypes getBufferType() const
152 	{
153 		return CPU_BUFFER;
154 	}
155 
156 	/**
157 	 * Return the base pointer in memory to the first vertex.
158 	 */
getBasePointer()159 	virtual float *getBasePointer() const
160 	{
161 		return m_basePointer;
162 	}
163 };
164 
165 #endif // #ifndef BT_SOFT_BODY_SOLVER_VERTEX_BUFFER_H
166