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

Revision 13041, 2.5 kB (checked in by robert, 3 years ago)

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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        static bool isPointSpriteSupported(unsigned int context);
63
64        enum CoordOriginMode {
65            UPPER_LEFT = GL_UPPER_LEFT,
66            LOWER_LEFT = GL_LOWER_LEFT
67        };
68
69        inline void setCoordOriginMode(CoordOriginMode mode) { _coordOriginMode = mode; }
70        inline CoordOriginMode getCoordOriginMode() const { return _coordOriginMode; }
71
72protected:
73        virtual ~PointSprite();
74
75        CoordOriginMode _coordOriginMode;
76};
77
78}
79
80#endif
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