openscenegraph
CullFace
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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_CULLFACE
15#define OSG_CULLFACE 1
16
17#include <osg/GL>
18#include <osg/StateAttribute>
19
20namespace osg {
21
22/** Class to globally enable/disable OpenGL's polygon culling mode.
23 */
24class OSG_EXPORT CullFace : public StateAttribute
25{
26 public :
27
28 enum Mode {
29 FRONT = GL_FRONT,
30 BACK = GL_BACK,
31 FRONT_AND_BACK = GL_FRONT_AND_BACK
32 };
33
34 CullFace(Mode mode=BACK):
35 _mode(mode) {}
36
37 /** Copy constructor using CopyOp to manage deep vs shallow copy.*/
38 CullFace(const CullFace& cf,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
39 StateAttribute(cf,copyop),
40 _mode(cf._mode) {}
41
42 META_StateAttribute(osg, CullFace, CULLFACE);
43
44 /** return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs.*/
45 virtual int compare(const StateAttribute& sa) const
46 {
47 // check the types are equal and then create the rhs variable
48 // used by the COMPARE_StateAttribute_Parameter macros below.
49 COMPARE_StateAttribute_Types(CullFace,sa)
50
51 // compare each parameter in turn against the rhs.
52 COMPARE_StateAttribute_Parameter(_mode)
53
54 return 0; // passed all the above comparison macros, must be equal.
55 }
56
57 virtual bool getModeUsage(StateAttribute::ModeUsage& usage) const
58 {
59 usage.usesMode(GL_CULL_FACE);
60 return true;
61 }
62
63 inline void setMode(Mode mode) { _mode = mode; }
64
65 inline Mode getMode() const { return _mode; }
66
67 virtual void apply(State& state) const;
68
69 protected:
70
71 virtual ~CullFace();
72
73 Mode _mode;
74
75};
76
77}
78
79#endif