root/OpenSceneGraph/trunk/include/osg/Depth @ 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_DEPTH
15#define OSG_DEPTH 1
16
17#include <osg/StateAttribute>
18
19namespace osg {
20
21/** Encapsulate OpenGL glDepthFunc/Mask/Range functions.
22*/
23class OSG_EXPORT Depth : public StateAttribute
24{
25    public :
26
27
28        enum Function
29        {
30            NEVER = GL_NEVER,
31            LESS = GL_LESS,
32            EQUAL = GL_EQUAL,
33            LEQUAL = GL_LEQUAL,
34            GREATER = GL_GREATER,
35            NOTEQUAL = GL_NOTEQUAL,
36            GEQUAL = GL_GEQUAL,
37            ALWAYS = GL_ALWAYS
38        };
39
40
41        Depth(Function func=LESS,double zNear=0.0, double zFar=1.0,bool writeMask=true);
42
43        /** Copy constructor using CopyOp to manage deep vs shallow copy.*/
44        Depth(const Depth& dp,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
45            StateAttribute(dp,copyop),
46            _func(dp._func),
47            _zNear(dp._zNear),
48            _zFar(dp._zFar),
49            _depthWriteMask(dp._depthWriteMask) {}
50
51
52        META_StateAttribute(osg, Depth, DEPTH);
53
54        /** return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs.*/
55        virtual int compare(const StateAttribute& sa) const
56        {
57            // check the types are equal and then create the rhs variable
58            // used by the COMPARE_StateAttribute_Parameter macros below.
59            COMPARE_StateAttribute_Types(Depth,sa)
60
61            // compare each parameter in turn against the rhs.
62            COMPARE_StateAttribute_Parameter(_func)
63            COMPARE_StateAttribute_Parameter(_depthWriteMask)
64            COMPARE_StateAttribute_Parameter(_zNear)
65            COMPARE_StateAttribute_Parameter(_zFar)
66
67            return 0; // passed all the above comparison macros, must be equal.
68        }
69
70        virtual bool getModeUsage(StateAttribute::ModeUsage& usage) const
71        {
72            usage.usesMode(GL_DEPTH_TEST);
73            return true;
74        }
75
76        inline void setFunction(Function func) { _func = func; }
77        inline Function getFunction() const { return _func; }
78
79
80        inline void setRange(double zNear, double zFar)
81        {
82            _zNear = zNear;
83            _zFar = zFar;
84        }
85
86        inline void setZNear(double zNear) { _zNear=zNear; }
87        inline double getZNear() const { return _zNear; }
88
89        inline void setZFar(double zFar) { _zFar=zFar; }
90        inline double getZFar() const { return _zFar; }
91
92        inline void setWriteMask(bool mask) { _depthWriteMask = mask; }
93        inline bool getWriteMask() const { return _depthWriteMask; }
94
95
96        virtual void apply(State& state) const;
97
98    protected:
99
100        virtual ~Depth();
101
102        Function            _func;
103
104        double              _zNear;
105        double              _zFar;
106
107        bool                _depthWriteMask;
108};
109
110}
111
112#endif
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