root/OpenSceneGraph/trunk/include/osgFX/Validator @ 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//osgFX - Copyright (C) 2003 Marco Jez
14
15#ifndef OSGFX_VALIDATOR_
16#define OSGFX_VALIDATOR_
17
18#include <osgFX/Effect>
19
20#include <osg/ref_ptr>
21#include <osg/StateAttribute>
22
23#include <vector>
24
25namespace osgFX
26{
27
28    /**
29     This class is used internally by osgFX::Effect to choose between different
30     techniques dynamically. The apply() method will call each technique's
31     validate() method and store the results in a buffered array. The Effect
32     class will then choose the first technique that could be validated in all
33     active rendering contexts.
34     */
35    class OSGFX_EXPORT Validator: public osg::StateAttribute {
36    public:
37
38        Validator();
39        Validator(Effect* effect);
40        Validator(const Validator& copy, const osg::CopyOp& copyop = osg::CopyOp::SHALLOW_COPY);
41
42        META_StateAttribute(osgFX, Validator, VALIDATOR);
43
44        void apply(osg::State& state) const;
45        void compileGLObjects(osg::State& state) const;
46
47        inline int compare(const osg::StateAttribute& sa) const;
48
49        inline void disable() { _effect = 0; }
50
51    protected:
52        virtual ~Validator() {}
53        Validator& operator=(const Validator&) { return *this; }
54
55    private:
56        mutable Effect* _effect;
57    };
58
59    // INLINE METHODS
60
61    inline int Validator::compare(const osg::StateAttribute& sa) const
62    {
63        // check the types are equal and then create the rhs variable
64        //used by the COMPARE_StateAttribute_Parameter macros below.
65        COMPARE_StateAttribute_Types(Validator,sa)
66
67        // compare parameters
68        COMPARE_StateAttribute_Parameter(_effect)
69
70        return 0;
71    }
72
73}
74
75#endif
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