/* -*-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. */ #include #include #include #include #include #include using namespace osg; int PointSprite::compare(const StateAttribute& sa) const { if (this==&sa) return 0;\ const std::type_info* type_lhs = &typeid(*this);\ const std::type_info* type_rhs = &typeid(sa);\ if (type_lhs->before(*type_rhs)) return -1;\ if (*type_lhs != *type_rhs) return 1;\ return 0; // passed all the above comparison macro's, must be equal. } bool PointSprite::checkValidityOfAssociatedModes(osg::State& state) const { bool modeValid = isPointSpriteSupported(state.getContextID()); state.setModeValidity(GL_POINT_SPRITE_ARB, modeValid); return modeValid; } void PointSprite::apply(osg::State& state) const { if(!isPointSpriteSupported(state.getContextID())) return; glTexEnvi(GL_POINT_SPRITE_ARB, GL_COORD_REPLACE_ARB, 1); } struct IntializedSupportedPair { IntializedSupportedPair(): initialized(false), supported(false) {} bool initialized; bool supported; }; typedef osg::buffered_object< IntializedSupportedPair > BufferedExtensions; static BufferedExtensions s_extensions; bool PointSprite::isPointSpriteSupported(unsigned int contextID) { if (!s_extensions[contextID].initialized) { s_extensions[contextID].initialized = true; s_extensions[contextID].supported = isGLExtensionSupported(contextID, "GL_ARB_point_sprite") || isGLExtensionSupported(contextID, "GL_NV_point_sprite"); } return s_extensions[contextID].supported; }