127 lines
4.0 KiB
C++
127 lines
4.0 KiB
C++
/* -*-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_TEXGEN
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#define OSG_TEXGEN 1
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#include <osg/Plane>
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#include <osg/StateAttribute>
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namespace osg {
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#ifndef GL_NORMAL_MAP_ARB
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#define GL_NORMAL_MAP_ARB 0x8511
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#endif
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#ifndef GL_REFLECTION_MAP_ARB
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#define GL_REFLECTION_MAP_ARB 0x8512
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#endif
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/** TexGen encapsulates the OpenGL glTexGen (texture coordinate generation)
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* state.*/
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class SG_EXPORT TexGen : public StateAttribute
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{
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public :
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TexGen();
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/** Copy constructor using CopyOp to manage deep vs shallow copy. */
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TexGen(const TexGen& texgen,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
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StateAttribute(texgen,copyop),
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_mode(texgen._mode),
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_plane_s(texgen._plane_s),
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_plane_t(texgen._plane_t),
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_plane_r(texgen._plane_r),
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_plane_q(texgen._plane_q) {}
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META_StateAttribute(osg, TexGen, TEXGEN);
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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 for equal types, then create the rhs variable
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// used by the COMPARE_StateAttribute_Paramter macros below.
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COMPARE_StateAttribute_Types(TexGen,sa)
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// Compare each parameter in turn against the rhs.
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COMPARE_StateAttribute_Parameter(_mode)
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COMPARE_StateAttribute_Parameter(_plane_s)
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COMPARE_StateAttribute_Parameter(_plane_t)
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COMPARE_StateAttribute_Parameter(_plane_r)
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COMPARE_StateAttribute_Parameter(_plane_q)
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return 0; // Passed all the above comparison macros, so must be equal.
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}
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virtual bool getModeUsage(ModeUsage& usage) const
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{
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usage.usesTextureMode(GL_TEXTURE_GEN_S);
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usage.usesTextureMode(GL_TEXTURE_GEN_T);
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// Not happy with turning all tex gen paramters on
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// as the OSG currently only supports 2D textures and therefore
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// only S and T will be required, R&Q would be redundant...
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// So commenting out the following until OSG supports 3D textures.
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// I plan to revamp the OpenGL state management later so will
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// tidy up then. Robert Osfield. Jan 2001.
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// The tidy up is now happening, but will have a think before
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// resolving the below parameters.
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usage.usesTextureMode(GL_TEXTURE_GEN_R);
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usage.usesTextureMode(GL_TEXTURE_GEN_Q);
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return true;
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}
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virtual void apply(State& state) const;
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enum Mode {
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OBJECT_LINEAR = GL_OBJECT_LINEAR,
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EYE_LINEAR = GL_EYE_LINEAR,
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SPHERE_MAP = GL_SPHERE_MAP,
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NORMAL_MAP = GL_NORMAL_MAP_ARB,
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REFLECTION_MAP = GL_REFLECTION_MAP_ARB
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};
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inline void setMode( Mode mode ) { _mode = mode; }
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Mode getMode() const { return _mode; }
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enum Coord {
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S, T, R, Q
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};
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void setPlane(Coord which, const Plane& plane);
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Plane& getPlane(Coord which);
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const Plane& getPlane(Coord which) const;
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protected :
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virtual ~TexGen( void );
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Mode _mode;
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/** Additional texgen coefficents for GL_OBJECT_PLANE or
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* GL_EYE_PLANE, */
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Plane _plane_s, _plane_t, _plane_r, _plane_q;
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};
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}
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#endif
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