root/OpenSceneGraph/trunk/include/osg/PolygonOffset @ 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_POLYGONOFFSET
15#define OSG_POLYGONOFFSET 1
16
17#include <osg/StateAttribute>
18
19#ifndef GL_POLYGON_OFFSET_LINE
20    #define GL_POLYGON_OFFSET_LINE 0x2A02
21    #define GL_POLYGON_OFFSET_POINT 0x2A01
22#endif
23
24namespace osg {
25
26/** PolygonOffset - encapsulates the OpenGL glPolygonOffset state.*/
27class OSG_EXPORT PolygonOffset : public StateAttribute
28{
29    public :
30
31        PolygonOffset();
32
33        PolygonOffset(float factor, float units);
34
35        /** Copy constructor using CopyOp to manage deep vs shallow copy.*/
36        PolygonOffset(const PolygonOffset& po,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
37            StateAttribute(po,copyop),
38            _factor(po._factor),
39            _units(po._units) {}
40
41        META_StateAttribute(osg, PolygonOffset, POLYGONOFFSET);
42
43        /** return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs.*/
44        virtual int compare(const StateAttribute& sa) const
45        {
46            // check the types are equal and then create the rhs variable
47            // used by the COMPARE_StateAttribute_Parameter macros below.
48            COMPARE_StateAttribute_Types(PolygonOffset,sa)
49
50            // compare each parameter in turn against the rhs.
51            COMPARE_StateAttribute_Parameter(_factor)
52            COMPARE_StateAttribute_Parameter(_units)
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_POLYGON_OFFSET_FILL);
60#if !defined(OSG_GLES1_AVAILABLE) && !defined(OSG_GLES2_AVAILABLE)
61            usage.usesMode(GL_POLYGON_OFFSET_LINE);
62            usage.usesMode(GL_POLYGON_OFFSET_POINT);
63#endif
64            return true;
65        }
66
67        inline void setFactor(float factor) { _factor = factor; }
68        inline float getFactor() const { return _factor; }
69
70        inline void setUnits(float units) { _units = units; }
71        inline float getUnits() const { return _units; }
72
73        virtual void apply(State& state) const;
74
75
76        static void setFactorMultiplier(float multiplier);
77        static float getFactorMultiplier();
78
79        static void setUnitsMultiplier(float multiplier);
80        static float getUnitsMultiplier();
81
82        static bool areFactorAndUnitsMultipliersSet();
83
84        /** Checks with the OpenGL driver to try and pick multiplier appropriate for the hardware.
85            note, requires a valid graphics context to be current. */
86        static void setFactorAndUnitsMultipliersUsingBestGuessForDriver();
87
88    protected :
89
90        virtual ~PolygonOffset();
91
92        float       _factor;
93        float       _units;
94
95};
96
97}
98
99#endif
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