FGFS-4.1/OpenSceneGraph
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correct a bug and make it more conservative

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This commit is contained in:
Julien Valentin 2017-07-31 02:43:50 +02:00
parent d810d4a4c0
commit aac146c7bc
1 changed files with 34 additions and 61 deletions
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95
examples/osgsimpleMDI/osgsimpleMDI.cpp
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@ -38,7 +38,7 @@
#include <osg/Shader>
#include <osg/BlendFunc>
#include <osg/Uniform>
#include <osg/Notify>
#include <osgViewer/Viewer>
#include <osgViewer/ViewerEventHandlers>
@ -51,7 +51,7 @@
///////////////////////////////////////////////////////////////////////////
#define MAXX 100
#define MAXY 100
//#define VIAINTERFACE 1
int main( int argc, char**argv )
{
@ -59,23 +59,25 @@ int main( int argc, char**argv )
bool MDIenable=true;
if(arguments.read("--classic"))
MDIenable=false;
{ MDIenable=false;
OSG_WARN<<"disabling MDI"<<std::endl;
}
osg::Geode* root( new osg::Geode );
osg::BoundingBox bb;
osg::Vec3 corner;
osg::ref_ptr<osg::VertexBufferObject> vertbo=new osg::VertexBufferObject;
osg::ref_ptr<osg::VertexBufferObject> texbo=new osg::VertexBufferObject;
osg::ref_ptr<osg::ElementBufferObject> ebo=new osg::ElementBufferObject;
///create empty mdi
osg::MultiDrawElementsIndirectUShort* mdi=new osg::MultiDrawElementsIndirectUShort(osg::PrimitiveSet::TRIANGLE_STRIP);
osg::DefaultIndirectCommandDrawElements* mdicommands= new osg::DefaultIndirectCommandDrawElements();
mdi->setIndirectCommandArray(mdicommands);
mdi->setBufferObject(ebo);
osg::ref_ptr<osg::Geometry> oldprHolder=new osg::Geometry();
osg::ref_ptr<osg::Geometry> geom=new osg::Geometry();
geom->setUseVertexBufferObjects(true);
osg::BoundingBox bb;
bb.set(0,0,0,MAXX,0,MAXY);
//set bounds by hand cause of the lack of support of basevertex in PrimitiveFunctors
geom->setInitialBound(bb);
osg::Vec3 myCoords[] =
{
@ -85,13 +87,6 @@ int main( int argc, char**argv )
osg::Vec3(0.7f,0.0f,0.7f)
};
osg::Vec2 myTexCoords[] =
{
osg::Vec2(0,1),
osg::Vec2(0,0),
osg::Vec2(1,0),
osg::Vec2(1,1)
};
unsigned short myIndices[] =
{
0,
@ -99,60 +94,38 @@ int main( int argc, char**argv )
3,
2
};
osg::Vec3Array * verts=new osg::Vec3Array();
for(int j =0 ; j<MAXY; ++j) {
for(int i =0 ; i<MAXX; ++i) {
///begin generate indexed quad
corner=osg::Vec3(i,0,j);
osg::Geometry* geom = new osg::Geometry();
geom->setUseVertexBufferObjects(true);
osg::Vec3Array * verts=new osg::Vec3Array(4,myCoords);
for(int z=0; z<4; z++)(*verts)[z]+=corner;
geom->setVertexArray(verts);
geom->setTexCoordArray(0,new osg::Vec2Array(4,myTexCoords));
geom->addPrimitiveSet(new osg::DrawElementsUShort(osg::PrimitiveSet::TRIANGLE_STRIP,4,myIndices));
///end generate indexed quad
bb.expandBy(geom->getBoundingBox());
if(MDIenable) {
///setup bos
geom->getVertexArray()->setBufferObject(vertbo);
geom->getTexCoordArray(0)->setBufferObject(texbo);
osg::DrawElementsUShort *dre = static_cast<osg::DrawElementsUShort*>(geom->getPrimitiveSet(0));
dre->setBufferObject(ebo);
///keep old pr alive for indices upload purpose
oldprHolder->addPrimitiveSet(dre);
geom->removePrimitiveSet(0,1);
///create indirect command
osg::DrawElementsIndirectCommand cmd;
cmd.count=4;
cmd.instanceCount=1;
cmd.firstIndex=root->getNumChildren()*4;
cmd.baseVertex=root->getNumChildren()*4;
mdicommands->push_back(cmd);
if(cmd.firstIndex==0) {
///only first geom have a mdi primset
geom->addPrimitiveSet(mdi);
///avoid bound computation to fail because of the lack of support of basevertex in functors
geom->setComputeBoundingBoxCallback(new osg::Drawable::ComputeBoundingBoxCallback);
}
///create indirect command
osg::DrawElementsIndirectCommand cmd;
cmd.count=4;
cmd.instanceCount=1;
cmd.firstIndex=verts->size();
cmd.baseVertex=verts->size();
mdicommands->push_back(cmd);
for(int z=0; z<4; z++) {
verts->push_back(osg::Vec3(i,0,j)+myCoords[z]);
mdi->addElement(myIndices[z]);
}
root->addChild(geom);
}
}
geom->setVertexArray(verts);
if(MDIenable) {
///override bounds
root->getDrawable(0)->setInitialBound(bb);
///put it somewhere
root->setUserData( oldprHolder);
}
geom->addPrimitiveSet(mdi);
} else
for(int i=0; i<MAXY*MAXX; ++i) {
for(int z=0; z<4; z++)myIndices[z]+=4;
osg::DrawElementsUShort *dre=new osg::DrawElementsUShort(osg::PrimitiveSet::TRIANGLE_STRIP,4,myIndices) ;
dre->setElementBufferObject(ebo);
geom->addPrimitiveSet(dre);
}
root->addChild(geom);
osgViewer::Viewer viewer;
viewer.addEventHandler(new osgViewer::StatsHandler);
viewer.setSceneData( root );