119 lines
4.7 KiB
C++
119 lines
4.7 KiB
C++
/* OpenSceneGraph example, osgpersistentbufferstorage
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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/* file: examples/osgpersistentbufferstorage/osgpersistentbufferstorage.cpp
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* author: Julien Valentin 2020-10-01
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* copyright: (C) 2013
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* license: OpenSceneGraph Public License (OSGPL)
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*
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* A test of BufferStorage and PersistantBufferStorage features
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*
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*/
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#include <osg/Geometry>
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#include <osgViewer/Viewer>
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///////////////////////////////////////////////////////////////////////////
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class SineAnimation: public osg::Drawable::DrawCallback
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{
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public:
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SineAnimation(osg::Vec4Array* dyn, float scale = 1.0f, float offset = 0.0f ) :
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_dyn(dyn),_rate(0), _scale(scale), _offset(offset)
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{}
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virtual void drawImplementation(osg::RenderInfo& renderInfo,const osg::Drawable* drawable ) const
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{
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unsigned int contextId = renderInfo.getContextID();
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osg::GLBufferObject * glbo = _dyn->getBufferObject()->getOrCreateGLBufferObject(contextId);
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glbo->bindBuffer();
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GLfloat * data=(GLfloat*)glbo->_persistentDMA+glbo->getOffset(_dyn->getBufferIndex());
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if(data)
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{
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_rate+=0.01;
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float value = sinf( _rate ) * _scale + _offset;
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for(int i=0; i<4; i++) {
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data[i*4+0]=float(i)*0.25*value;
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}
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glbo->commitDMA(_dyn->getBufferIndex());
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}
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drawable->drawImplementation(renderInfo);
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}
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private:
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osg::ref_ptr<osg::Vec4Array> _dyn;
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mutable float _rate;
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const float _scale;
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const float _offset;
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};
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///////////////////////////////////////////////////////////////////////////
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int main( int, char** )
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{
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osg::ref_ptr<osg::Group> root = new osg::Group;
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/// a first geom to demonstrate how to use usage to enable immutable buffer storage
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{
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osg::ref_ptr<osg::Vec4Array> vAry = new osg::Vec4Array;
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vAry->push_back( osg::Vec4(2,0,0,1) );
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vAry->push_back( osg::Vec4(2,0,1,1) );
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vAry->push_back( osg::Vec4(3,0,0,1) );
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vAry->push_back( osg::Vec4(3,0,1,1) );
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osg::ref_ptr<osg::VertexBufferObject> vbo = new osg::VertexBufferObject;
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vbo->setUsage(GL_MAP_WRITE_BIT); // enable bufferStorage
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vbo->setMappingBitfield(GL_MAP_WRITE_BIT); // set mapping flags
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vAry->setBufferObject(vbo);
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osg::ref_ptr<osg::Geometry> geom = new osg::Geometry;
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geom->setUseDisplayList(false);
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geom->setUseVertexBufferObjects(true);
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geom->setVertexArray( vAry );
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geom->addPrimitiveSet( new osg::DrawArrays( GL_LINES, 0, vAry->size() ) );
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root->addChild(geom);
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}
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//second geometry buffer is persistent mapped and modified in camera callback
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{
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osg::ref_ptr<osg::Vec4Array> vAry = new osg::Vec4Array;
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vAry->setDataVariance(osg::Object::STATIC);
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vAry->push_back( osg::Vec4(0,0,0,1) );
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vAry->push_back( osg::Vec4(0,0,1,1) );
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vAry->push_back( osg::Vec4(1,0,0,1) );
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vAry->push_back( osg::Vec4(1,0,1,1) );
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osg::ref_ptr<osg::VertexBufferObject> vbo = new osg::VertexBufferObject;
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vbo->setDataVariance(osg::Object::STATIC);
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vbo->setUsage(GL_MAP_WRITE_BIT | GL_MAP_PERSISTENT_BIT ); // enable persistent bufferStorage
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vbo->setMappingBitfield(GL_MAP_WRITE_BIT | GL_MAP_PERSISTENT_BIT| GL_MAP_FLUSH_EXPLICIT_BIT );// set mapping flags
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vAry->setBufferObject(vbo);
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osg::ref_ptr<osg::Geometry> geom = new osg::Geometry;
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geom->setUseDisplayList(false);
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geom->setUseVertexBufferObjects(true);
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geom->setVertexArray( vAry );
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geom->addPrimitiveSet( new osg::DrawArrays( GL_QUADS, 0, vAry->size() ) );
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geom->setDrawCallback(new SineAnimation(vAry));
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root->addChild(geom);
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}
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osgViewer::Viewer viewer;
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viewer.setSceneData( root );
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return viewer.run();
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}
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