142 lines
4.8 KiB
C++
142 lines
4.8 KiB
C++
/* OpenSceneGraph example, osgtransformfeedback
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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/osgsimpleMDI/osgsimpleMDI.cpp
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* author: Julien Valentin 2017-08-01
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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 simple example of mdi with basevertex
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*
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*/
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#include <osg/GL2Extensions>
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#include <osg/Notify>
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#include <osg/ref_ptr>
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#include <osg/Geode>
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#include <osg/Geometry>
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#include <osg/Point>
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#include <osg/Vec3>
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#include <osg/Vec4>
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#include <osg/Program>
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#include <osg/Shader>
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#include <osg/BlendFunc>
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#include <iostream>
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#include <osgViewer/Viewer>
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#include <osgViewer/ViewerEventHandlers>
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#include <osg/PrimitiveSetIndirect>
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#include <osg/BufferIndexBinding>
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int main( int argc, char**argv )
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{
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osg::ArgumentParser arguments(&argc,argv);
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arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is the example which demonstrates Multi Indirect Draw with basevertex");
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arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] ");
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arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
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arguments.getApplicationUsage()->addCommandLineOption("--numX","square count on X");
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arguments.getApplicationUsage()->addCommandLineOption("--numY","square count on Y");
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arguments.getApplicationUsage()->addCommandLineOption("--classic","disable MDI and use classic DrawElements");
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if (arguments.read("-h") || arguments.read("--help"))
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{
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arguments.getApplicationUsage()->write(std::cout);
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return 1;
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}
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int MAXX=200;
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int MAXY=200;
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arguments.read("--numX",MAXX);
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arguments.read("--numY",MAXY);
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bool MDIenable=true;
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if(arguments.read("--classic"))
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{ MDIenable=false;
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OSG_WARN<<"disabling MDI"<<std::endl;
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}
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osg::Geode* root( new osg::Geode );
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osg::ref_ptr<osg::ElementBufferObject> ebo=new osg::ElementBufferObject;
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///create empty mdi
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osg::MultiDrawElementsIndirectUShort* mdi=new osg::MultiDrawElementsIndirectUShort(osg::PrimitiveSet::TRIANGLE_STRIP);
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osg::DefaultIndirectCommandDrawElements* mdicommands= new osg::DefaultIndirectCommandDrawElements();
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mdi->setIndirectCommandArray(mdicommands);
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osg::ref_ptr<osg::Geometry> geom=new osg::Geometry();
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geom->setUseVertexBufferObjects(true);
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osg::BoundingBox bb;
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bb.set(0,0,0,MAXX,0,MAXY);
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//set bounds by hand cause of the lack of support of basevertex in PrimitiveFunctors
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geom->setInitialBound(bb);
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osg::Vec3 myCoords[] =
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{
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osg::Vec3(0,0.0f,0.7f),
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osg::Vec3(0,0.0f,0),
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osg::Vec3(0.7,0.0f,0),
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osg::Vec3(0.7f,0.0f,0.7f)
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};
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unsigned short myIndices[] = { 0, 1, 3, 2 };
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unsigned int myIndicesUI[] = { 0, 1, 3, 2 };
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osg::Vec3Array * verts=new osg::Vec3Array();
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for(int j =0 ; j<MAXY; ++j) {
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for(int i =0 ; i<MAXX; ++i) {
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///create indirect command
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osg::DrawElementsIndirectCommand cmd;
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cmd.count=4;
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cmd.instanceCount=1;
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cmd.firstIndex=verts->size();
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cmd.baseVertex=verts->size();
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mdicommands->push_back(cmd);
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for(int z=0; z<4; z++) {
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verts->push_back(osg::Vec3(i,0,j)+myCoords[z]);
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mdi->addElement(myIndices[z]);
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}
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}
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}
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geom->setVertexArray(verts);
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if(MDIenable) {
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geom->addPrimitiveSet(mdi);
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} else
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for(int i=0; i<MAXY*MAXX; ++i) {
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osg::DrawElementsUInt *dre=new osg::DrawElementsUInt(osg::PrimitiveSet::TRIANGLE_STRIP,4,myIndicesUI) ;
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dre->setElementBufferObject(ebo);
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geom->addPrimitiveSet(dre);
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for(int z=0; z<4; z++)myIndicesUI[z]+=4;
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}
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root->addChild(geom);
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osgViewer::Viewer viewer;
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viewer.addEventHandler(new osgViewer::StatsHandler);
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viewer.setSceneData( root );
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return viewer.run();
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}
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