root/OpenSceneGraph/trunk/include/osg/FrontFace @ 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_FRONTFACE
15#define OSG_FRONTFACE 1
16
17#include <osg/StateAttribute>
18#include <osg/GL>
19
20namespace osg {
21
22/** Class to specify the orientation of front-facing polygons.
23*/
24class OSG_EXPORT FrontFace : public StateAttribute
25{
26    public :
27
28        enum Mode {
29            CLOCKWISE = GL_CW,
30            COUNTER_CLOCKWISE = GL_CCW
31        };
32
33        FrontFace(Mode face=COUNTER_CLOCKWISE);
34
35        /** Copy constructor using CopyOp to manage deep vs shallow copy.*/
36        FrontFace(const FrontFace& ff,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
37            StateAttribute(ff,copyop),
38            _mode(ff._mode) {}
39
40        META_StateAttribute(osg, FrontFace, FRONTFACE);
41
42        /** return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs.*/
43        virtual int compare(const StateAttribute& sa) const
44        {
45            // check the types are equal and then create the rhs variable
46            // used by the COMPARE_StateAttribute_Parameter macros below.
47            COMPARE_StateAttribute_Types(FrontFace,sa)
48
49            // compare each parameter in turn against the rhs.
50            COMPARE_StateAttribute_Parameter(_mode)
51
52            return 0; // passed all the above comparison macros, must be equal.
53        }
54
55        inline void setMode(Mode mode) { _mode = mode; }
56        inline Mode getMode() const    { return _mode; }
57
58        virtual void apply(State& state) const;
59
60    protected:
61
62        virtual ~FrontFace();
63
64        Mode _mode;
65
66};
67
68}
69
70#endif
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