94 lines
2.8 KiB
C++
94 lines
2.8 KiB
C++
/* -*-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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#include <osg/GLExtensions>
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#include <osg/GL>
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#include <osg/PointSprite>
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#include <osg/Point>
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#include <osg/State>
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#include <osg/buffered_value>
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#include <osg/Notify>
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using namespace osg;
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PointSprite::PointSprite()
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: _coordOriginMode(UPPER_LEFT)
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{
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}
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PointSprite::~PointSprite()
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{
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}
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int PointSprite::compare(const StateAttribute& sa) const
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{
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COMPARE_StateAttribute_Types(PointSprite,sa)
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COMPARE_StateAttribute_Parameter(_coordOriginMode)
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return 0; // passed all the above comparison macros, must be equal.
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}
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bool PointSprite::checkValidityOfAssociatedModes(osg::State& state) const
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{
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bool modeValid = isPointSpriteSupported(state.getContextID());
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state.setModeValidity(GL_POINT_SPRITE_ARB, modeValid);
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return modeValid;
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}
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void PointSprite::apply(osg::State& state) const
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{
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#if defined( OSG_GL3_AVAILABLE )
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const Point::Extensions* extensions = Point::getExtensions(state.getContextID(),true);
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extensions->glPointParameteri(GL_POINT_SPRITE_COORD_ORIGIN,_coordOriginMode);
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#elif defined( OSG_GL_FIXED_FUNCTION_AVAILABLE )
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if(!isPointSpriteSupported(state.getContextID())) return;
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glTexEnvi(GL_POINT_SPRITE_ARB, GL_COORD_REPLACE_ARB, 1);
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const Point::Extensions* extensions = Point::getExtensions(state.getContextID(),true);
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if (extensions->isPointSpriteCoordOriginSupported())
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extensions->glPointParameteri(GL_POINT_SPRITE_COORD_ORIGIN,_coordOriginMode);
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#else
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OSG_NOTICE<<"Warning: PointSprite::apply(State&) - not supported."<<std::endl;
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#endif
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}
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struct IntializedSupportedPair
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{
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IntializedSupportedPair():
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initialized(false),
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supported(false) {}
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bool initialized;
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bool supported;
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};
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typedef osg::buffered_object< IntializedSupportedPair > BufferedExtensions;
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static BufferedExtensions s_extensions;
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bool PointSprite::isPointSpriteSupported(unsigned int contextID)
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{
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if (!s_extensions[contextID].initialized)
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{
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s_extensions[contextID].initialized = true;
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s_extensions[contextID].supported = OSG_GL3_FEATURES || isGLExtensionSupported(contextID, "GL_ARB_point_sprite") || isGLExtensionSupported(contextID, "GL_NV_point_sprite");
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}
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return s_extensions[contextID].supported;
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}
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