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/branches/OpenSceneGraph-3.4@15165 16af8721-9629-0410-8352-f15c8da7e697
This commit is contained in:
Robert Osfield
2015-10-22 14:14:53 +00:00
parent 74f1838960
commit 6a67be2e32
281 changed files with 2443 additions and 2050 deletions
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12
examples/osgspheresegment/osgspheresegment.cpp
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@@ -183,7 +183,7 @@ osg::Node* createMovingModel(const osg::Vec3& center, float radius, osg::Geode *
osg::Group* model = new osg::Group;
osg::Node* glider = osgDB::readNodeFile("glider.osgt");
osg::ref_ptr<osg::Node> glider = osgDB::readRefNodeFile("glider.osgt");
if (glider)
{
const osg::BoundingSphere& bs = glider->getBound();
@@ -236,7 +236,7 @@ osg::Node* createMovingModel(const osg::Vec3& center, float radius, osg::Geode *
model->addChild(xform);
}
osg::Node* cessna = osgDB::readNodeFile("cessna.osgt");
osg::ref_ptr<osg::Node> cessna = osgDB::readRefNodeFile("cessna.osgt");
if (cessna)
{
const osg::BoundingSphere& bs = cessna->getBound();
@@ -361,12 +361,12 @@ void build_world(osg::Group *root, unsigned int testCase, bool useOverlay, osgSi
{
// create terrain
osg::ref_ptr<osg::Geode> terrainGeode = 0;
osg::ref_ptr<osg::Geode> terrainGeode;
{
terrainGeode = new osg::Geode;
osg::StateSet* stateset = new osg::StateSet();
osg::Image* image = osgDB::readImageFile("Images/lz.rgb");
osg::ref_ptr<osg::StateSet> stateset = new osg::StateSet();
osg::ref_ptr<osg::Image> image = osgDB::readRefImageFile("Images/lz.rgb");
if (image)
{
osg::Texture2D* texture = new osg::Texture2D;
@@ -385,7 +385,7 @@ void build_world(osg::Group *root, unsigned int testCase, bool useOverlay, osgSi
osg::Vec3 origin(0.0f,0.0f,0.0f);
osg::Vec3 size(1000.0f,1000.0f,250.0f);
osg::Geometry* geometry = new osg::Geometry;
osg::ref_ptr<osg::Geometry> geometry = new osg::Geometry;
osg::Vec3Array& v = *(new osg::Vec3Array(numColumns*numRows));
osg::Vec2Array& tc = *(new osg::Vec2Array(numColumns*numRows));