71 lines
2.2 KiB
Plaintext
71 lines
2.2 KiB
Plaintext
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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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#ifndef OSG_TEXENVFILTER
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#define OSG_TEXENVFILTER 1
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#include <osg/GL>
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#include <osg/StateAttribute>
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namespace osg {
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#ifndef GL_EXT_texture_lod_bias
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#define GL_MAX_TEXTURE_LOD_BIAS_EXT 0x84FD
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#define GL_TEXTURE_FILTER_CONTROL_EXT 0x8500
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#define GL_TEXTURE_LOD_BIAS_EXT 0x8501
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#endif
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/** TexEnvFilter - encapsulates the OpenGL glTexEnv (GL_TEXTURE_FILTER_CONTROL) state.*/
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class SG_EXPORT TexEnvFilter : public StateAttribute
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{
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public:
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TexEnvFilter(float lodBias = 0.0f);
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/** Copy constructor using CopyOp to manage deep vs shallow copy.*/
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TexEnvFilter(const TexEnvFilter& texenv,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
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StateAttribute(texenv,copyop),
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_lodBias(texenv._lodBias) {}
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META_StateAttribute(osg, TexEnvFilter, TEXENVFILTER);
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virtual bool isTextureAttribute() const { return true; }
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/** return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs.*/
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virtual int compare(const StateAttribute& sa) const
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{
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// check the types are equal and then create the rhs variable
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// used by the COMPARE_StateAttribute_Paramter macro's below.
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COMPARE_StateAttribute_Types(TexEnvFilter, sa)
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// compare each paramter in turn against the rhs.
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COMPARE_StateAttribute_Parameter(_lodBias)
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return 0; // passed all the above comparison macro's, must be equal.
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}
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void setLodBias( float lodBias ) { _lodBias = lodBias; }
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float getLodBias() const { return _lodBias; }
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virtual void apply(State& state) const;
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protected:
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virtual ~TexEnvFilter();
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float _lodBias;
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};
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}
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#endif
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