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Move double buffering implementation inside RigGeometry

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The double buffering is an implementation detail so it should be handled as such, rather than mandating the scene graph to be structured in a certain way.

Override accept(NodeVisitor&) instead of using callbacks.
This commit is contained in:
scrawl 2017-09-01 18:27:00 +02:00
parent 132ac6001b
commit 209e139aa8
7 changed files with 97 additions and 156 deletions
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13
components/nifosg/nifloader.cpp
View file

@ -1236,7 +1236,6 @@ namespace NifOsg
SceneUtil::RigGeometry::BoneInfluence influence;
const std::vector<Nif::NiSkinData::VertWeight> &weights = data->bones[i].weights;
//influence.mWeights.reserve(weights.size());
for(size_t j = 0;j < weights.size();j++)
{
std::pair<unsigned short, float> indexWeight = std::make_pair(weights[j].vertex, weights[j].weight);
@ -1249,17 +1248,7 @@ namespace NifOsg
}
rig->setInfluenceMap(map);
// Add a copy, we will alternate between the two copies every other frame using the FrameSwitch
// This is so we can set the DataVariance as STATIC, giving a huge performance boost
rig->setDataVariance(osg::Object::STATIC);
osg::ref_ptr<FrameSwitch> frameswitch = new FrameSwitch;
SceneUtil::RigGeometry* rig2 = osg::clone(rig.get(), osg::CopyOp::DEEP_COPY_NODES|osg::CopyOp::DEEP_COPY_DRAWABLES);
frameswitch->addChild(rig);
frameswitch->addChild(rig2);
parentNode->addChild(frameswitch);
parentNode->addChild(rig);
}
osg::BlendFunc::BlendFuncMode getBlendMode(int mode)

6
components/sceneutil/attach.cpp
View file

@ -43,13 +43,13 @@ namespace SceneUtil
traverse(node);
}
virtual void apply(osg::Geometry& geom)
virtual void apply(osg::Drawable& drawable)
{
std::string lowerName = Misc::StringUtils::lowerCase(geom.getName());
std::string lowerName = Misc::StringUtils::lowerCase(drawable.getName());
if ((lowerName.size() >= mFilter.size() && lowerName.compare(0, mFilter.size(), mFilter) == 0)
|| (lowerName.size() >= mFilter2.size() && lowerName.compare(0, mFilter2.size(), mFilter2) == 0))
{
osg::Node* node = &geom;
osg::Node* node = &drawable;
while (node && node->getNumParents() && !node->getStateSet())
node = node->getParent(0);
if (node)

191
components/sceneutil/riggeometry.cpp
View file

@ -10,73 +10,17 @@
namespace SceneUtil
{
class UpdateRigBounds : public osg::Drawable::UpdateCallback
{
public:
UpdateRigBounds()
{
}
UpdateRigBounds(const UpdateRigBounds& copy, const osg::CopyOp& copyop)
: osg::Drawable::UpdateCallback(copy, copyop)
{
}
META_Object(SceneUtil, UpdateRigBounds)
void update(osg::NodeVisitor* nv, osg::Drawable* drw)
{
RigGeometry* rig = static_cast<RigGeometry*>(drw);
rig->updateBounds(nv);
}
};
// TODO: make threadsafe for multiple cull threads
class UpdateRigGeometry : public osg::Drawable::CullCallback
{
public:
UpdateRigGeometry()
{
}
UpdateRigGeometry(const UpdateRigGeometry& copy, const osg::CopyOp& copyop)
: osg::Drawable::CullCallback(copy, copyop)
{
}
META_Object(SceneUtil, UpdateRigGeometry)
virtual bool cull(osg::NodeVisitor* nv, osg::Drawable* drw, osg::State*) const
{
RigGeometry* geom = static_cast<RigGeometry*>(drw);
geom->update(nv);
return false;
}
};
// We can't compute the bounds without a NodeVisitor, since we need the current geomToSkelMatrix.
// So we return nothing. Bounds are updated every frame in the UpdateCallback.
class DummyComputeBoundCallback : public osg::Drawable::ComputeBoundingBoxCallback
{
public:
virtual osg::BoundingBox computeBound(const osg::Drawable&) const { return osg::BoundingBox(); }
};
RigGeometry::RigGeometry()
: mSkeleton(NULL)
, mLastFrameNumber(0)
, mBoundsFirstFrame(true)
{
setCullCallback(new UpdateRigGeometry);
setUpdateCallback(new UpdateRigBounds);
setSupportsDisplayList(false);
setUseVertexBufferObjects(true);
setComputeBoundingBoxCallback(new DummyComputeBoundCallback);
setUpdateCallback(new osg::Callback); // dummy to make sure getNumChildrenRequiringUpdateTraversal() is correct
// update done in accept(NodeVisitor&)
}
RigGeometry::RigGeometry(const RigGeometry &copy, const osg::CopyOp &copyop)
: osg::Geometry(copy, copyop)
: Drawable(copy, copyop)
, mSkeleton(NULL)
, mInfluenceMap(copy.mInfluenceMap)
, mLastFrameNumber(0)
@ -89,57 +33,47 @@ void RigGeometry::setSourceGeometry(osg::ref_ptr<osg::Geometry> sourceGeometry)
{
mSourceGeometry = sourceGeometry;
osg::Geometry& from = *sourceGeometry;
if (from.getStateSet())
setStateSet(from.getStateSet());
// shallow copy primitive sets & vertex attributes that we will not modify
setPrimitiveSetList(from.getPrimitiveSetList());
setColorArray(from.getColorArray());
setSecondaryColorArray(from.getSecondaryColorArray());
setFogCoordArray(from.getFogCoordArray());
// need to copy over texcoord list manually due to a missing null pointer check in setTexCoordArrayList(), this has been fixed in OSG 3.5
osg::Geometry::ArrayList& texCoordList = from.getTexCoordArrayList();
for (unsigned int i=0; i<texCoordList.size(); ++i)
if (texCoordList[i])
setTexCoordArray(i, texCoordList[i], osg::Array::BIND_PER_VERTEX);
setVertexAttribArrayList(from.getVertexAttribArrayList());
// vertices and normals are modified every frame, so we need to deep copy them.
// assign a dedicated VBO to make sure that modifications don't interfere with source geometry's VBO.
osg::ref_ptr<osg::VertexBufferObject> vbo (new osg::VertexBufferObject);
vbo->setUsage(GL_DYNAMIC_DRAW_ARB);
osg::ref_ptr<osg::Array> vertexArray = osg::clone(from.getVertexArray(), osg::CopyOp::DEEP_COPY_ALL);
if (vertexArray)
for (unsigned int i=0; i<2; ++i)
{
vertexArray->setVertexBufferObject(vbo);
setVertexArray(vertexArray);
}
osg::Geometry& from = *sourceGeometry;
mGeometry[i] = new osg::Geometry(from, osg::CopyOp::SHALLOW_COPY);
osg::Geometry& to = *mGeometry[i];
to.setSupportsDisplayList(false);
to.setUseVertexBufferObjects(true);
to.setCullingActive(false); // make sure to disable culling since that's handled by this class
if (osg::Array* normals = from.getNormalArray())
{
osg::ref_ptr<osg::Array> normalArray = osg::clone(normals, osg::CopyOp::DEEP_COPY_ALL);
if (normalArray)
// vertices and normals are modified every frame, so we need to deep copy them.
// assign a dedicated VBO to make sure that modifications don't interfere with source geometry's VBO.
osg::ref_ptr<osg::VertexBufferObject> vbo (new osg::VertexBufferObject);
vbo->setUsage(GL_DYNAMIC_DRAW_ARB);
osg::ref_ptr<osg::Array> vertexArray = osg::clone(from.getVertexArray(), osg::CopyOp::DEEP_COPY_ALL);
if (vertexArray)
{
normalArray->setVertexBufferObject(vbo);
setNormalArray(normalArray, osg::Array::BIND_PER_VERTEX);
vertexArray->setVertexBufferObject(vbo);
to.setVertexArray(vertexArray);
}
}
if (osg::Array* normals = from.getNormalArray())
{
osg::ref_ptr<osg::Array> normalArray = osg::clone(normals, osg::CopyOp::DEEP_COPY_ALL);
if (normalArray)
{
normalArray->setVertexBufferObject(vbo);
to.setNormalArray(normalArray, osg::Array::BIND_PER_VERTEX);
}
}
if (osg::Vec4Array* tangents = dynamic_cast<osg::Vec4Array*>(from.getTexCoordArray(7)))
{
mSourceTangents = tangents;
osg::ref_ptr<osg::Array> tangentArray = osg::clone(tangents, osg::CopyOp::DEEP_COPY_ALL);
tangentArray->setVertexBufferObject(vbo);
setTexCoordArray(7, tangentArray, osg::Array::BIND_PER_VERTEX);
if (osg::Vec4Array* tangents = dynamic_cast<osg::Vec4Array*>(from.getTexCoordArray(7)))
{
mSourceTangents = tangents;
osg::ref_ptr<osg::Array> tangentArray = osg::clone(tangents, osg::CopyOp::DEEP_COPY_ALL);
tangentArray->setVertexBufferObject(vbo);
to.setTexCoordArray(7, tangentArray, osg::Array::BIND_PER_VERTEX);
}
else
mSourceTangents = NULL;
}
else
mSourceTangents = NULL;
}
osg::ref_ptr<osg::Geometry> RigGeometry::getSourceGeometry()
@ -228,7 +162,7 @@ void accumulateMatrix(const osg::Matrixf& invBindMatrix, const osg::Matrixf& mat
ptrresult[14] += ptr[14] * weight;
}
void RigGeometry::update(osg::NodeVisitor* nv)
void RigGeometry::cull(osg::NodeVisitor* nv)
{
if (!mSkeleton)
{
@ -238,23 +172,24 @@ void RigGeometry::update(osg::NodeVisitor* nv)
return;
}
if (!mSkeleton->getActive() && mLastFrameNumber != 0)
return;
if (mLastFrameNumber == nv->getTraversalNumber())
if ((!mSkeleton->getActive() && mLastFrameNumber != 0) || mLastFrameNumber == nv->getTraversalNumber())
{
nv->apply(*getGeometry(mLastFrameNumber));
return;
}
mLastFrameNumber = nv->getTraversalNumber();
osg::Geometry& geom = *getGeometry(mLastFrameNumber);
mSkeleton->updateBoneMatrices(nv->getTraversalNumber());
// skinning
osg::Vec3Array* positionSrc = static_cast<osg::Vec3Array*>(mSourceGeometry->getVertexArray());
osg::Vec3Array* normalSrc = static_cast<osg::Vec3Array*>(mSourceGeometry->getNormalArray());
osg::Vec4Array* tangentSrc = mSourceTangents;
const osg::Vec3Array* positionSrc = static_cast<osg::Vec3Array*>(mSourceGeometry->getVertexArray());
const osg::Vec3Array* normalSrc = static_cast<osg::Vec3Array*>(mSourceGeometry->getNormalArray());
const osg::Vec4Array* tangentSrc = mSourceTangents;
osg::Vec3Array* positionDst = static_cast<osg::Vec3Array*>(getVertexArray());
osg::Vec3Array* normalDst = static_cast<osg::Vec3Array*>(getNormalArray());
osg::Vec4Array* tangentDst = static_cast<osg::Vec4Array*>(getTexCoordArray(7));
osg::Vec3Array* positionDst = static_cast<osg::Vec3Array*>(geom.getVertexArray());
osg::Vec3Array* normalDst = static_cast<osg::Vec3Array*>(geom.getNormalArray());
osg::Vec4Array* tangentDst = static_cast<osg::Vec4Array*>(geom.getTexCoordArray(7));
for (Bone2VertexMap::const_iterator it = mBone2VertexMap.begin(); it != mBone2VertexMap.end(); ++it)
{
@ -294,6 +229,10 @@ void RigGeometry::update(osg::NodeVisitor* nv)
normalDst->dirty();
if (tangentDst)
tangentDst->dirty();
nv->pushOntoNodePath(&geom);
nv->apply(geom);
nv->popFromNodePath();
}
void RigGeometry::updateBounds(osg::NodeVisitor *nv)
@ -365,5 +304,29 @@ void RigGeometry::setInfluenceMap(osg::ref_ptr<InfluenceMap> influenceMap)
mInfluenceMap = influenceMap;
}
void RigGeometry::accept(osg::NodeVisitor &nv)
{
if (!nv.validNodeMask(*this))
return;
nv.pushOntoNodePath(this);
if (nv.getVisitorType() == osg::NodeVisitor::CULL_VISITOR)
cull(&nv);
else if (nv.getVisitorType() == osg::NodeVisitor::UPDATE_VISITOR)
updateBounds(&nv);
else if (nv.getVisitorType() == osg::NodeVisitor::INTERSECTION_VISITOR)
nv.apply(*getGeometry(mLastFrameNumber));
else
nv.apply(*this);
nv.popFromNodePath();
}
osg::Geometry* RigGeometry::getGeometry(unsigned int frame) const
{
return mGeometry[frame%2].get();
}
}

22
components/sceneutil/riggeometry.hpp
View file

@ -13,10 +13,9 @@ namespace SceneUtil
/// @brief Mesh skinning implementation.
/// @note A RigGeometry may be attached directly to a Skeleton, or somewhere below a Skeleton.
/// Note though that the RigGeometry ignores any transforms below the Skeleton, so the attachment point is not that important.
/// @note To avoid race conditions, the rig geometry needs to be double buffered. This can be done
/// using a FrameSwitch node that has two RigGeometry children. In the future we may want to consider implementing
/// the double buffering inside RigGeometry.
class RigGeometry : public osg::Geometry
/// @note The internal Geometry used for rendering is double buffered, this allows updates to be done in a thread safe way while
/// not compromising rendering performance. This is crucial when using osg's default threading model of DrawThreadPerContext.
class RigGeometry : public osg::Drawable
{
public:
RigGeometry();
@ -24,6 +23,9 @@ namespace SceneUtil
META_Object(SceneUtil, RigGeometry)
// At this point compileGLObjects() remains unimplemented, hard to avoid race conditions
// and there is limited value in compiling anyway since the data will change again for the next frame
struct BoneInfluence
{
osg::Matrixf mInvBindMatrix;
@ -45,13 +47,15 @@ namespace SceneUtil
osg::ref_ptr<osg::Geometry> getSourceGeometry();
// Called automatically by our CullCallback
void update(osg::NodeVisitor* nv);
// Called automatically by our UpdateCallback
void updateBounds(osg::NodeVisitor* nv);
virtual void accept(osg::NodeVisitor &nv);
private:
void cull(osg::NodeVisitor* nv);
void updateBounds(osg::NodeVisitor* nv);
osg::ref_ptr<osg::Geometry> mGeometry[2];
osg::Geometry* getGeometry(unsigned int frame) const;
osg::ref_ptr<osg::Geometry> mSourceGeometry;
osg::ref_ptr<osg::Vec4Array> mSourceTangents;
Skeleton* mSkeleton;

2
components/sceneutil/serialize.cpp
View file

@ -50,7 +50,7 @@ class RigGeometrySerializer : public osgDB::ObjectWrapper
{
public:
RigGeometrySerializer()
: osgDB::ObjectWrapper(createInstanceFunc<SceneUtil::RigGeometry>, "SceneUtil::RigGeometry", "osg::Object osg::Node osg::Drawable osg::Geometry SceneUtil::RigGeometry")
: osgDB::ObjectWrapper(createInstanceFunc<SceneUtil::RigGeometry>, "SceneUtil::RigGeometry", "osg::Object osg::Node osg::Drawable SceneUtil::RigGeometry")
{
}
};

17
components/sceneutil/skeleton.cpp
View file

@ -38,8 +38,6 @@ Skeleton::Skeleton()
, mNeedToUpdateBoneMatrices(true)
, mActive(true)
, mLastFrameNumber(0)
, mTraversedEvenFrame(false)
, mTraversedOddFrame(false)
{
}
@ -50,8 +48,6 @@ Skeleton::Skeleton(const Skeleton &copy, const osg::CopyOp &copyop)
, mNeedToUpdateBoneMatrices(true)
, mActive(copy.mActive)
, mLastFrameNumber(0)
, mTraversedEvenFrame(false)
, mTraversedOddFrame(false)
{
}
@ -115,11 +111,6 @@ void Skeleton::updateBoneMatrices(unsigned int traversalNumber)
mLastFrameNumber = traversalNumber;
if (mLastFrameNumber % 2 == 0)
mTraversedEvenFrame = true;
else
mTraversedOddFrame = true;
if (mNeedToUpdateBoneMatrices)
{
if (mRootBone.get())
@ -144,18 +135,14 @@ bool Skeleton::getActive() const
void Skeleton::markDirty()
{
mTraversedEvenFrame = false;
mTraversedOddFrame = false;
mLastFrameNumber = 0;
mBoneCache.clear();
mBoneCacheInit = false;
}
void Skeleton::traverse(osg::NodeVisitor& nv)
{
if (!getActive() && nv.getVisitorType() == osg::NodeVisitor::UPDATE_VISITOR
// need to process at least 2 frames before shutting off update, since we need to have both frame-alternating RigGeometries initialized
// this would be more naturally handled if the double-buffering was implemented in RigGeometry itself rather than in a FrameSwitch decorator node
&& mLastFrameNumber != 0 && mTraversedEvenFrame && mTraversedOddFrame)
if (!getActive() && nv.getVisitorType() == osg::NodeVisitor::UPDATE_VISITOR && mLastFrameNumber != 0)
return;
osg::Group::traverse(nv);
}

2
components/sceneutil/skeleton.hpp
View file

@ -74,8 +74,6 @@ namespace SceneUtil
bool mActive;
unsigned int mLastFrameNumber;
bool mTraversedEvenFrame;
bool mTraversedOddFrame;
};
}