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_PATCHPARAMETER
15#define OSG_PATCHPARAMETER 1
16
17#include <osg/Vec2>
18#include <osg/Vec4>
19#include <osg/StateAttribute>
20
21namespace osg {
22
23/** Class which encapsulates glPatchParameter(..).
24*/
25class OSG_EXPORT PatchParameter : public StateAttribute
26{
27    public :
28
29        PatchParameter(GLint vertices=3);
30
31        /** Copy constructor using CopyOp to manage deep vs shallow copy.*/
32        PatchParameter(const PatchParameter& rhs,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
33            StateAttribute(rhs,copyop),
34            _vertices(rhs._vertices),
35            _patchDefaultInnerLevel(rhs._patchDefaultInnerLevel),
36            _patchDefaultOuterLevel(rhs._patchDefaultOuterLevel) {}
37
38
39        META_StateAttribute(osg, PatchParameter, PATCH_PARAMETER);
40
41        /** return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs.*/
42        virtual int compare(const StateAttribute& sa) const
43        {
44            // check the types are equal and then create the rhs variable
45            // used by the COMPARE_StateAttribute_Parameter macros below.
46            COMPARE_StateAttribute_Types(PatchParameter,sa)
47
48            // compare each parameter in turn against the rhs.
49            COMPARE_StateAttribute_Parameter(_vertices)
50            COMPARE_StateAttribute_Parameter(_patchDefaultInnerLevel)
51            COMPARE_StateAttribute_Parameter(_patchDefaultOuterLevel)
52
53            return 0; // passed all the above comparison macros, must be equal.
54        }
55
56        /** Set GL_PATCH_VERTICES parameter.*/
57        void setVertices(GLint vertices) { _vertices = vertices; }
58
59        /** Get GL_PATCH_VERTICES parameter.*/
60        GLint getVertices() const { return _vertices; }
61
62        /** Set GL_PATCH_DEFAULT_INNER_LEVEL parameter.*/
63        void setPatchDefaultInnerLevel(const osg::Vec2& level) { _patchDefaultInnerLevel = level; }
64
65        /** Get GL_PATCH_DEFAULT_INNER_LEVEL parameter.*/
66        const osg::Vec2& getPatchDefaultInnerLevel() const { return _patchDefaultInnerLevel; }
67
68        /** Set GL_PATCH_DEFAULT_OUTER_LEVEL parameter.*/
69        void setPatchDefaultOuterLevel(const osg::Vec4& level) { _patchDefaultOuterLevel = level; }
70
71        /** Get GL_PATCH_DEFAULT_INNER_LEVEL parameter.*/
72        const osg::Vec4& getPatchDefaultOuterLevel() const { return _patchDefaultOuterLevel; }
73
74        virtual void apply(State& state) const;
75
76    protected:
77
78        virtual ~PatchParameter();
79
80        GLint           _vertices;
81        osg::Vec2       _patchDefaultInnerLevel;
82        osg::Vec4       _patchDefaultOuterLevel;
83};
84
85}
86
87#endif
88