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142 lines
4.7 KiB
142 lines
4.7 KiB
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 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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#if defined(OSG_GLES1_AVAILABLE) || defined(OSG_GLES2_AVAILABLE) || defined(OSG_GL3_AVAILABLE) |
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#define GL_OBJECT_LINEAR 0x2401 |
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#define GL_EYE_LINEAR 0x2400 |
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#define GL_SPHERE_MAP 0x2402 |
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#define GL_TEXTURE_GEN_S 0x0C60 |
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#define GL_TEXTURE_GEN_T 0x0C61 |
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#define GL_TEXTURE_GEN_R 0x0C62 |
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#define GL_TEXTURE_GEN_Q 0x0C63 |
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#endif |
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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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namespace osg { |
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/** TexGen encapsulates the OpenGL glTexGen (texture coordinate generation) |
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* state.*/ |
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class OSG_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_Parameter 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(StateAttribute::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 parameters 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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/** Set the tex gen planes from specified matrix. |
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* Typical usage would be to pass in a projection |
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* matrix to set up projective texturing. |
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*/ |
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void setPlanesFromMatrix(const Matrixd& matrix); |
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protected : |
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virtual ~TexGen( void ); |
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Mode _mode; |
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/** Additional texgen coefficients 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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