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OcclusionQueryNode: fix use case of user defined query geometry

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The user defined query geometry handling has been broken in several ways.

The previous way of defining a query geometry was using the non const
`getQueryGeometry` method and overriding its members. But then
`OcclusionQueryNode` wasn't aware of the geometry change and couldn't
internally handle it correctly.

The `computeBound` method never considered a user defined query geometry and
always just overrode the vertices of the geometry.

The member `_validQueryGeometry` wasn't correctly set.

This change should fix all this issues by introducing a small backward
compatibility break. The non const `getQueryGeometry` method is removed
forcing the user to use the `setQueryGeometry` method. But then `OcclusionQueryNode`
is aware of the user defined query geometry and can handle it correctly.
This commit is contained in:
Daniel Trstenjak 2019-08-14 11:27:40 +02:00 committed by Julien Valentin
parent 8fb5ba4a3f
commit 817d92b703
2 changed files with 126 additions and 72 deletions
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26
include/osg/OcclusionQueryNode
View File

@ -82,9 +82,9 @@ public:
};
/** return a QueryResult for specified Camera, where the QueryResult.valid is true when query results are available, and in which case the QueryResult.numPixels provides the num of pixels in the query result.*/
QueryResult getQueryResult( const osg::Camera* cam );
QueryResult getQueryResult( const osg::Camera* cam ) const;
unsigned int getNumPixels( const osg::Camera* cam );
unsigned int getNumPixels( const osg::Camera* cam ) const;
virtual void releaseGLObjects( osg::State* state = 0 ) const;
@ -158,8 +158,11 @@ public:
osg::StateSet* getQueryStateSet();
const osg::StateSet* getQueryStateSet() const;
// Get the QueryGeometry object used for occlusion query. Returns 0 if no QueryGeometry is created.
osg::QueryGeometry* getQueryGeometry();
// Set and get the QueryGeometry object used for the occlusion query.
// By default an axis aligned box is used as the query geometry.
// Resetting to the default query geometry is done by setting it to 0.
// Returns 0 if no QueryGeometry is created.
void setQueryGeometry( osg::QueryGeometry* geom );
const osg::QueryGeometry* getQueryGeometry() const;
// Set and get the StateSet used by the OcclusionQueryNode
@ -189,17 +192,28 @@ public:
static void discardDeletedQueryObjects( unsigned int contextID );
protected:
enum QueryGeometryState {
INVALID,
VALID,
USER_DEFINED
};
virtual ~OcclusionQueryNode();
virtual void createSupportNodes();
bool isQueryGeometryValid() const { return _queryGeometryState != INVALID; }
void setQueryGeometryInternal( osg::QueryGeometry* queryGeom,
osg::Geometry* debugQueryGeom,
QueryGeometryState state );
osg::ref_ptr< osg::Geode > _queryGeode;
osg::ref_ptr< osg::Geode > _debugGeode;
bool _enabled;
// If the box of the query geometry is valid.
mutable bool _validQueryGeometry;
mutable QueryGeometryState _queryGeometryState;
// Tracks the last frame number that we performed a query.
// User can set how many times (See setQueryFrameCount).

106
src/osg/OcclusionQueryNode.cpp
View File

@ -48,6 +48,36 @@
namespace osg
{
QueryGeometry* createDefaultQueryGeometry( const std::string& name )
{
GLushort indices[] = { 0, 1, 2, 3, 4, 5, 6, 7,
0, 3, 6, 5, 2, 1, 4, 7,
5, 4, 1, 0, 2, 7, 6, 3 };
ref_ptr<QueryGeometry> geom = new QueryGeometry( name );
geom->setDataVariance( Object::DYNAMIC );
geom->addPrimitiveSet( new DrawElementsUShort( PrimitiveSet::QUADS, 24, indices ) );
return geom.release();
}
Geometry* createDefaultDebugQueryGeometry()
{
GLushort indices[] = { 0, 1, 2, 3, 4, 5, 6, 7,
0, 3, 6, 5, 2, 1, 4, 7,
5, 4, 1, 0, 2, 7, 6, 3 };
ref_ptr<Vec4Array> ca = new Vec4Array;
ca->push_back( Vec4( 1.f, 1.f, 1.f, 1.f ) );
ref_ptr<Geometry> geom = new Geometry;
geom->setDataVariance( Object::DYNAMIC );
geom->setColorArray( ca.get(), Array::BIND_OVERALL );
geom->addPrimitiveSet( new DrawElementsUShort( PrimitiveSet::QUADS, 24, indices ) );
return geom.release();
}
// Create and return a StateSet appropriate for performing an occlusion
// query test (disable lighting, texture mapping, etc). Probably some
// room for improvement here. Could disable shaders, for example.
@ -364,7 +394,7 @@ QueryGeometry::drawImplementation( osg::RenderInfo& renderInfo ) const
}
QueryGeometry::QueryResult QueryGeometry::getQueryResult( const osg::Camera* cam )
QueryGeometry::QueryResult QueryGeometry::getQueryResult( const osg::Camera* cam ) const
{
osg::ref_ptr<osg::TestResult> tr;
{
@ -380,7 +410,7 @@ QueryGeometry::QueryResult QueryGeometry::getQueryResult( const osg::Camera* cam
}
unsigned int
QueryGeometry::getNumPixels( const osg::Camera* cam )
QueryGeometry::getNumPixels( const osg::Camera* cam ) const
{
return getQueryResult(cam).numPixels;
}
@ -442,7 +472,7 @@ QueryGeometry::discardDeletedQueryObjects( unsigned int contextID )
OcclusionQueryNode::OcclusionQueryNode()
: _enabled( true ),
_validQueryGeometry( false ),
_queryGeometryState( INVALID ),
_passed(false),
_visThreshold( 500 ),
_queryFrameCount( 5 ),
@ -460,7 +490,7 @@ OcclusionQueryNode::~OcclusionQueryNode()
OcclusionQueryNode::OcclusionQueryNode( const OcclusionQueryNode& oqn, const CopyOp& copyop )
: Group( oqn, copyop ),
_validQueryGeometry( false ),
_queryGeometryState( INVALID ),
_passed( false )
{
_enabled = oqn._enabled;
@ -485,7 +515,7 @@ bool OcclusionQueryNode::getPassed( const Camera* camera, NodeVisitor& nv )
QueryGeometry* qg = static_cast< QueryGeometry* >( _queryGeode->getDrawable( 0 ) );
if ( !_validQueryGeometry )
if ( !isQueryGeometryValid() )
{
// There're cases that the occlusion test result has been retrieved
// after the query geometry has been changed, it's the result of the
@ -556,7 +586,7 @@ bool OcclusionQueryNode::getPassed( const Camera* camera, NodeVisitor& nv )
void OcclusionQueryNode::traverseQuery( const Camera* camera, NodeVisitor& nv )
{
if (!_validQueryGeometry || ! _enabled)
if (!isQueryGeometryValid() || ! _enabled)
return;
bool issueQuery;
@ -590,6 +620,8 @@ BoundingSphere OcclusionQueryNode::computeBound() const
// an application thread or by a non-osgViewer application.
OpenThreads::ScopedLock<OpenThreads::Mutex> lock( _computeBoundMutex ) ;
if (_queryGeometryState != USER_DEFINED)
{
// This is the logical place to put this code, but the method is const. Cast
// away constness to compute the bounding box and modify the query geometry.
osg::OcclusionQueryNode* nonConstThis = const_cast<osg::OcclusionQueryNode*>( this );
@ -599,7 +631,7 @@ BoundingSphere OcclusionQueryNode::computeBound() const
nonConstThis->accept( cbv );
BoundingBox bb = cbv.getBoundingBox();
const bool bbValid = bb.valid();
_validQueryGeometry = bbValid;
_queryGeometryState = bbValid ? VALID : INVALID;
osg::ref_ptr<Vec3Array> v = new Vec3Array;
v->resize( 8 );
@ -627,6 +659,7 @@ BoundingSphere OcclusionQueryNode::computeBound() const
geom = static_cast< osg::Geometry* >( nonConstThis->_debugGeode->getDrawable( 0 ) );
geom->setVertexArray( v.get() );
}
}
return Group::computeBound();
}
@ -723,21 +756,12 @@ bool OcclusionQueryNode::getPassed() const
void OcclusionQueryNode::createSupportNodes()
{
GLushort indices[] = { 0, 1, 2, 3, 4, 5, 6, 7,
0, 3, 6, 5, 2, 1, 4, 7,
5, 4, 1, 0, 2, 7, 6, 3 };
{
// Add the test geometry Geode
_queryGeode = new Geode;
_queryGeode->setName( "OQTest" );
_queryGeode->setDataVariance( Object::DYNAMIC );
ref_ptr< QueryGeometry > geom = new QueryGeometry( getName() );
geom->setDataVariance( Object::DYNAMIC );
geom->addPrimitiveSet( new DrawElementsUShort( PrimitiveSet::QUADS, 24, indices ) );
_queryGeode->addDrawable( geom.get() );
_queryGeode->addDrawable( createDefaultQueryGeometry( getName() ) );
}
{
@ -746,17 +770,7 @@ void OcclusionQueryNode::createSupportNodes()
_debugGeode = new Geode;
_debugGeode->setName( "Debug" );
_debugGeode->setDataVariance( Object::DYNAMIC );
ref_ptr<Geometry> geom = new Geometry;
geom->setDataVariance( Object::DYNAMIC );
ref_ptr<Vec4Array> ca = new Vec4Array;
ca->push_back( Vec4( 1.f, 1.f, 1.f, 1.f ) );
geom->setColorArray( ca.get(), Array::BIND_OVERALL );
geom->addPrimitiveSet( new DrawElementsUShort( PrimitiveSet::QUADS, 24, indices ) );
_debugGeode->addDrawable( geom.get() );
_debugGeode->addDrawable( createDefaultDebugQueryGeometry() );
}
// Creste state sets. Note that the osgOQ visitors (which place OQNs throughout
@ -767,6 +781,28 @@ void OcclusionQueryNode::createSupportNodes()
}
void OcclusionQueryNode::setQueryGeometryInternal( QueryGeometry* queryGeom,
Geometry* debugQueryGeom,
QueryGeometryState state )
{
if (!queryGeom || !debugQueryGeom)
{
OSG_FATAL << "osgOQ: OcclusionQueryNode: No QueryGeometry." << std::endl;
return;
}
OpenThreads::ScopedLock<OpenThreads::Mutex> lock( _computeBoundMutex ) ;
_queryGeometryState = state;
_queryGeode->removeDrawables(0, _queryGeode->getNumDrawables());
_queryGeode->addDrawable(queryGeom);
_debugGeode->removeDrawables(0, _debugGeode->getNumDrawables());
_debugGeode->addDrawable(debugQueryGeom);
}
void OcclusionQueryNode::releaseGLObjects( State* state ) const
{
if (_queryGeode.valid()) _queryGeode->releaseGLObjects(state);
@ -787,14 +823,18 @@ void OcclusionQueryNode::discardDeletedQueryObjects( unsigned int contextID )
QueryGeometry::discardDeletedQueryObjects( contextID );
}
osg::QueryGeometry* OcclusionQueryNode::getQueryGeometry()
void OcclusionQueryNode::setQueryGeometry( QueryGeometry* geom )
{
if (_queryGeode && _queryGeode->getDrawable( 0 ))
if (geom)
{
QueryGeometry* qg = static_cast< QueryGeometry* >( _queryGeode->getDrawable( 0 ) );
return qg;
setQueryGeometryInternal( geom, geom, USER_DEFINED );
}
else
{
setQueryGeometryInternal( createDefaultQueryGeometry( getName() ),
createDefaultDebugQueryGeometry(),
INVALID);
}
return 0;
}
const osg::QueryGeometry* OcclusionQueryNode::getQueryGeometry() const