FGFS-4.1/OpenSceneGraph
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Introduced CMake option OSG_PROVIDE_READFILE option that defaults to ON, but when switched to OFF disables the building of the osgDB::read*File() methods,

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forcing users to use osgDB::readRef*File() methods.  The later is preferable as it closes a potential threading bug when using paging databases in conjunction
with the osgDB::Registry Object Cache.  This threading bug occurs when one thread gets an object from the Cache via an osgDB::read*File() call where only
a pointer to the object is passed back, so taking a reference to the object is delayed till it gets reassigned to a ref_ptr<>, but at the same time another
thread calls a flush of the Object Cache deleting this object as it's referenceCount is now zero.  Using osgDB::readREf*File() makes sure the a ref_ptr<> is
passed back and the referenceCount never goes to zero.

To ensure the OSG builds when OSG_PROVIDE_READFILE is to OFF the many cases of osgDB::read*File() usage had to be replaced with a ref_ptr<> osgDB::readRef*File()
usage.  The avoid this change causing lots of other client code to be rewritten to handle the use of ref_ptr<> in place of C pointer I introduced a serious of
templte methods in various class to adapt ref_ptr<> to the underly C pointer to be passed to old OSG API's, example of this is found in include/osg/Group:

    bool addChild(Node* child); // old method which can only be used with a Node*

    tempalte<class T> bool addChild(const osg::ref_ptr<T>& child) { return addChild(child.get()); } // adapter template method

These changes together cover 149 modified files, so it's a large submission. This extent of changes are warrent to make use of the Object Cache
and multi-threaded loaded more robust.



git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/trunk@15164 16af8721-9629-0410-8352-f15c8da7e697
This commit is contained in:
Robert Osfield
2015-10-22 13:42:19 +00:00
parent 79fb9abbbf
commit dd996a3289
295 changed files with 2503 additions and 2172 deletions
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2
include/osgUtil/IntersectionVisitor
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@@ -160,7 +160,7 @@ class OSGUTIL_EXPORT IntersectionVisitor : public osg::NodeVisitor
* tighter integration.*/
struct ReadCallback : public osg::Referenced
{
virtual osg::Node* readNodeFile(const std::string& filename) = 0;
virtual osg::ref_ptr<osg::Node> readNodeFile(const std::string& filename) = 0;
};

4
include/osgUtil/Optimizer
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@@ -122,10 +122,14 @@ class OSGUTIL_EXPORT Optimizer
* visitors, specified by the OptimizationOptions.*/
void optimize(osg::Node* node);
template<class T> void optimize(const osg::ref_ptr<T>& node) { optimize(node.get()); }
/** Traverse the node and its subgraph with a series of optimization
* visitors, specified by the OptimizationOptions.*/
virtual void optimize(osg::Node* node, unsigned int options);
template<class T> void optimize(const osg::ref_ptr<T>& node, unsigned int options) { optimize(node.get(), options); }
/** Callback for customizing what operations are permitted on objects in the scene graph.*/
struct IsOperationPermissibleForObjectCallback : public osg::Referenced