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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* OpenSceneGraph Public License for more details.
*/
#ifndef OSG_TEXENVFILTER
#define OSG_TEXENVFILTER 1
#include <osg/GL>
#include <osg/StateAttribute>
#ifndef GL_EXT_texture_lod_bias
#define GL_MAX_TEXTURE_LOD_BIAS_EXT 0x84FD
#define GL_TEXTURE_FILTER_CONTROL_EXT 0x8500
#define GL_TEXTURE_LOD_BIAS_EXT 0x8501
#endif
namespace osg {
/** TexEnvFilter - encapsulates the OpenGL glTexEnv (GL_TEXTURE_FILTER_CONTROL) state.*/
class OSG_EXPORT TexEnvFilter : public StateAttribute
{
public:
TexEnvFilter(float lodBias = 0.0f);
/** Copy constructor using CopyOp to manage deep vs shallow copy.*/
TexEnvFilter(const TexEnvFilter& texenv,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
StateAttribute(texenv,copyop),
_lodBias(texenv._lodBias) {}
META_StateAttribute(osg, TexEnvFilter, TEXENVFILTER);
virtual bool isTextureAttribute() const { return true; }
/** return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs.*/
virtual int compare(const StateAttribute& sa) const
{
// check the types are equal and then create the rhs variable
// used by the COMPARE_StateAttribute_Parameter macros below.
COMPARE_StateAttribute_Types(TexEnvFilter, sa)
// compare each parameter in turn against the rhs.
COMPARE_StateAttribute_Parameter(_lodBias)
return 0; // passed all the above comparison macros, must be equal.
}
void setLodBias( float lodBias ) { _lodBias = lodBias; }
float getLodBias() const { return _lodBias; }
virtual void apply(State& state) const;
protected:
virtual ~TexEnvFilter();
float _lodBias;
};
}
#endif
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