root/OpenSceneGraph/trunk/include/osg/buffered_value @ 13041

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1/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
2 *
3 * This library is open source and may be redistributed and/or modified under
4 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
5 * (at your option) any later version.  The full license is in LICENSE file
6 * included with this distribution, and on the openscenegraph.org website.
7 *
8 * This library is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11 * OpenSceneGraph Public License for more details.
12*/
13
14#ifndef OSG_BUFFERED_VALUE
15#define OSG_BUFFERED_VALUE 1
16
17#include <osg/DisplaySettings>
18#include <vector>
19
20namespace osg {
21
22/** Implements a simple buffered value for values that need to be buffered on
23  * a per graphics context basis.
24*/
25template<class T>
26class buffered_value
27{
28    public:
29
30        inline buffered_value():
31            _array(DisplaySettings::instance()->getMaxNumberOfGraphicsContexts(),0)
32            {}
33
34        inline buffered_value(unsigned int size):
35            _array(size,0)
36            {}
37
38        buffered_value& operator = (const buffered_value& rhs)
39        {
40            _array = rhs._array;
41            return *this;
42        }
43
44        inline void setAllElementsTo(const T& t) { std::fill(_array.begin(),_array.end(),t); }
45
46        inline void clear() { _array.clear(); }
47
48        inline bool empty() const { return _array.empty(); }
49
50        inline unsigned int size() const { return _array.size(); }
51
52        inline void resize(unsigned int newSize) { _array.resize(newSize,0); }
53
54        inline T& operator[] (unsigned int pos)
55        {
56            // automatically resize array.
57            if (_array.size()<=pos)
58                _array.resize(pos+1,0);
59
60            return _array[pos];
61        }
62
63        inline T operator[] (unsigned int pos) const
64        {
65            // automatically resize array.
66            if (_array.size()<=pos)
67                _array.resize(pos+1,0);
68
69            return _array[pos];
70        }
71
72    protected:
73
74        mutable std::vector<T> _array;
75};
76
77template<class T>
78class buffered_object
79{
80    public:
81
82        inline buffered_object():
83            _array(DisplaySettings::instance()->getMaxNumberOfGraphicsContexts())
84            {}
85
86        inline buffered_object(unsigned int size):
87            _array(size)
88            {}
89
90        buffered_object& operator = (const buffered_object& rhs)
91        {
92            _array = rhs._array;
93            return *this;
94        }
95
96        inline void setAllElementsTo(const T& t) { std::fill(_array.begin(),_array.end(),t); }
97
98        inline void clear() { _array.clear(); }
99
100        inline bool empty() const { return _array.empty(); }
101
102        inline unsigned int size() const { return _array.size(); }
103
104        inline void resize(unsigned int newSize) { _array.resize(newSize); }
105
106        inline T& operator[] (unsigned int pos)
107        {
108            // automatically resize array.
109            if (_array.size()<=pos)
110                _array.resize(pos+1);
111
112            return _array[pos];
113        }
114
115        inline const T& operator[] (unsigned int pos) const
116        {
117            // automatically resize array.
118            if (_array.size()<=pos)
119                _array.resize(pos+1);
120
121            return _array[pos];
122        }
123
124
125    protected:
126
127        mutable std::vector<T> _array;
128};
129
130}
131
132#endif
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