openscenegraph
osgFX/Validator
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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