openscenegraph
FrontFace
Go to the documentation of this file.
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