openscenegraph
PointSprite
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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_POINTSPRITE
15#define OSG_POINTSPRITE 1
16
17#include <osg/GL>
18#include <osg/StateAttribute>
19
20#ifndef GL_ARB_point_sprite
21#define GL_POINT_SPRITE_ARB 0x8861
22#define GL_COORD_REPLACE_ARB 0x8862
23#endif
24
25#ifndef GL_POINT_SPRITE_COORD_ORIGIN
26#define GL_POINT_SPRITE_COORD_ORIGIN 0x8CA0
27#define GL_LOWER_LEFT 0x8CA1
28#define GL_UPPER_LEFT 0x8CA2
29#endif
30
31namespace osg {
32
33/** PointSprite base class which encapsulates enabling of point sprites .*/
34class OSG_EXPORT PointSprite : public osg::StateAttribute {
35public:
36
37 PointSprite();
38
39 /** Copy constructor using CopyOp to manage deep vs shallow copy.*/
40 PointSprite(const PointSprite& ps,const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY):
41 StateAttribute(ps,copyop),
42 _coordOriginMode(ps._coordOriginMode) {}
43
44
45 META_StateAttribute(osg, PointSprite, POINTSPRITE);
46
47 /** return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs.*/
48 virtual int compare(const StateAttribute& sa) const;
49
50 virtual bool getModeUsage(StateAttribute::ModeUsage& usage) const
51 {
52 usage.usesMode(GL_POINT_SPRITE_ARB);
53 return true;
54 }
55
56 virtual bool checkValidityOfAssociatedModes(osg::State&) const;
57
58 virtual bool isTextureAttribute() const { return true; }
59
60 virtual void apply(osg::State& state) const;
61
62 enum CoordOriginMode {
63 UPPER_LEFT = GL_UPPER_LEFT,
64 LOWER_LEFT = GL_LOWER_LEFT
65 };
66
67 inline void setCoordOriginMode(CoordOriginMode mode) { _coordOriginMode = mode; }
68 inline CoordOriginMode getCoordOriginMode() const { return _coordOriginMode; }
69
70protected:
71 virtual ~PointSprite();
72
73 CoordOriginMode _coordOriginMode;
74};
75
76}
77
78#endif