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_CULLFACE 15#define OSG_CULLFACE 1 16 17#include <osg/GL> 18#include <osg/StateAttribute> 19 20namespace osg { 21 22/** Class to globally enable/disable OpenGL's polygon culling mode. 23 */ 24class OSG_EXPORT CullFace : public StateAttribute 25{ 26 public : 27 28 enum Mode { 29 FRONT = GL_FRONT, 30 BACK = GL_BACK, 31 FRONT_AND_BACK = GL_FRONT_AND_BACK 32 }; 33 34 CullFace(Mode mode=BACK): 35 _mode(mode) {} 36 37 /** Copy constructor using CopyOp to manage deep vs shallow copy.*/ 38 CullFace(const CullFace& cf,const CopyOp& copyop=CopyOp::SHALLOW_COPY): 39 StateAttribute(cf,copyop), 40 _mode(cf._mode) {} 41 42 META_StateAttribute(osg, CullFace, CULLFACE); 43 44 /** return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs.*/ 45 virtual int compare(const StateAttribute& sa) const 46 { 47 // check the types are equal and then create the rhs variable 48 // used by the COMPARE_StateAttribute_Parameter macros below. 49 COMPARE_StateAttribute_Types(CullFace,sa) 50 51 // compare each parameter in turn against the rhs. 52 COMPARE_StateAttribute_Parameter(_mode) 53 54 return 0; // passed all the above comparison macros, must be equal. 55 } 56 57 virtual bool getModeUsage(StateAttribute::ModeUsage& usage) const 58 { 59 usage.usesMode(GL_CULL_FACE); 60 return true; 61 } 62 63 inline void setMode(Mode mode) { _mode = mode; } 64 65 inline Mode getMode() const { return _mode; } 66 67 virtual void apply(State& state) const; 68 69 protected: 70 71 virtual ~CullFace(); 72 73 Mode _mode; 74 75}; 76 77} 78 79#endif 80