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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20
examples/osgblenddrawbuffers/osgblenddrawbuffers.cpp
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@@ -71,9 +71,17 @@ int main( int argc, char **argv )
bool useGlobalBlending = false;
if ( arguments.read("--no-draw-buffers") ) useGlobalBlending = true;
osg::ref_ptr<osg::Node> cessna = osgDB::readRefNodeFile("cessna.osgt");
if (!cessna)
{
OSG_NOTICE<<"Cannot not find model 'cessna.osg' to render"<<std::endl;
return 1;
}
// Create a camera to output multi-rendering-targets (MRT)
osg::Camera* mrtCam = createMRTCamera( textures );
mrtCam->addChild( osgDB::readNodeFile("cessna.osgt") );
osg::ref_ptr<osg::Camera> mrtCam = createMRTCamera( textures );
mrtCam->addChild( cessna );
// Create shader program to be used
const char* mrtFragmentCode = {
@@ -87,8 +95,8 @@ int main( int argc, char **argv )
osg::ref_ptr<osg::Program> program = new osg::Program;
program->addShader( new osg::Shader(osg::Shader::FRAGMENT, mrtFragmentCode) );
osg::StateSet* ss = mrtCam->getOrCreateStateSet();
ss->setAttributeAndModes( program.get() );
osg::ref_ptr<osg::StateSet> ss = mrtCam->getOrCreateStateSet();
ss->setAttributeAndModes( program );
// Apply blending to the original scene in MRT
if ( !useGlobalBlending )
@@ -103,8 +111,8 @@ int main( int argc, char **argv )
// Accept different blend/colormask attributes on multiple render targets
osg::ref_ptr<osg::BlendFunci> blend0 = new osg::BlendFunci(0, GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
osg::ref_ptr<osg::ColorMaski> colormask3 = new osg::ColorMaski(3, false, true, false, true);
ss->setAttribute( blend0.get() );
ss->setAttributeAndModes( colormask3.get() );
ss->setAttribute( blend0 );
ss->setAttributeAndModes( colormask3 );
}
else
{