openscenegraph
TexEnvFilter
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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_TEXENVFILTER
15#define OSG_TEXENVFILTER 1
16
17#include <osg/GL>
18#include <osg/StateAttribute>
19
20#ifndef GL_EXT_texture_lod_bias
21#define GL_MAX_TEXTURE_LOD_BIAS_EXT 0x84FD
22#define GL_TEXTURE_FILTER_CONTROL_EXT 0x8500
23#define GL_TEXTURE_LOD_BIAS_EXT 0x8501
24#endif
25
26namespace osg {
27
28/** TexEnvFilter - encapsulates the OpenGL glTexEnv (GL_TEXTURE_FILTER_CONTROL) state.*/
29class OSG_EXPORT TexEnvFilter : public StateAttribute
30{
31 public:
32 TexEnvFilter(float lodBias = 0.0f);
33
34 /** Copy constructor using CopyOp to manage deep vs shallow copy.*/
35 TexEnvFilter(const TexEnvFilter& texenv,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
36 StateAttribute(texenv,copyop),
37 _lodBias(texenv._lodBias) {}
38
39 META_StateAttribute(osg, TexEnvFilter, TEXENVFILTER);
40
41 virtual bool isTextureAttribute() const { return true; }
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(TexEnvFilter, sa)
49
50 // compare each parameter in turn against the rhs.
51 COMPARE_StateAttribute_Parameter(_lodBias)
52
53 return 0; // passed all the above comparison macros, must be equal.
54 }
55
56 void setLodBias( float lodBias ) { _lodBias = lodBias; }
57
58 float getLodBias() const { return _lodBias; }
59
60 virtual void apply(State& state) const;
61
62 protected:
63 virtual ~TexEnvFilter();
64
65 float _lodBias;
66};
67
68}
69
70#endif