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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8
examples/osgshadercomposition/osgshadercomposition.cpp
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@@ -25,7 +25,7 @@ extern osg::Node* createOldShaderCompositionScene(osg::ArgumentParser& arguments
osg::Node* createNewShaderCompositionScene(osg::ArgumentParser& arguments)
{
osg::ref_ptr<osg::Node> node = osgDB::readNodeFiles(arguments);
osg::ref_ptr<osg::Node> node = osgDB::readRefNodeFiles(arguments);
if (!node) return 0;
osg::ref_ptr<osg::Group> group = new osg::Group;
@@ -34,21 +34,21 @@ osg::Node* createNewShaderCompositionScene(osg::ArgumentParser& arguments)
osg::ref_ptr<osg::Program> program = new osg::Program;
stateset->setAttribute(program.get());
osg::ref_ptr<osg::Shader> lighting_shader = osgDB::readShaderFile("shaders/lighting.vert");
osg::ref_ptr<osg::Shader> lighting_shader = osgDB::readRefShaderFile("shaders/lighting.vert");
if (lighting_shader.valid())
{
program->addShader(lighting_shader.get());
OSG_NOTICE<<"Adding lighting shader"<<std::endl;
}
osg::ref_ptr<osg::Shader> vertex_shader = osgDB::readShaderFile("shaders/osgshadercomposition.vert");
osg::ref_ptr<osg::Shader> vertex_shader = osgDB::readRefShaderFile("shaders/osgshadercomposition.vert");
if (vertex_shader.valid())
{
program->addShader(vertex_shader.get());
OSG_NOTICE<<"Adding vertex shader"<<std::endl;
}
osg::ref_ptr<osg::Shader> fragment_shader = osgDB::readShaderFile("shaders/osgshadercomposition.frag");
osg::ref_ptr<osg::Shader> fragment_shader = osgDB::readRefShaderFile("shaders/osgshadercomposition.frag");
if (fragment_shader.valid())
{
program->addShader(fragment_shader.get());