dd996a3289
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
86 lines
2.8 KiB
C++
86 lines
2.8 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2008 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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#include <osgDB/ReadFile>
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#include <osgViewer/ViewerEventHandlers>
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#include <osgWidget/VncClient>
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using namespace osgWidget;
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VncClient::VncClient(const std::string& hostname, const GeometryHints& hints)
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{
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connect(hostname, hints);
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}
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bool VncClient::assign(VncImage* vncImage, const GeometryHints& hints)
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{
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if (!vncImage) return false;
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_vncImage = vncImage;
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bool flip = _vncImage->getOrigin()==osg::Image::TOP_LEFT;
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float aspectRatio = (_vncImage->t()>0 && _vncImage->s()>0) ? float(_vncImage->t()) / float(_vncImage->s()) : 1.0;
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osg::Vec3 widthVec(hints.widthVec);
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osg::Vec3 heightVec(hints.heightVec);
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switch(hints.aspectRatioPolicy)
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{
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case(GeometryHints::RESIZE_HEIGHT_TO_MAINTAINCE_ASPECT_RATIO):
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heightVec *= aspectRatio;
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break;
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case(GeometryHints::RESIZE_WIDTH_TO_MAINTAINCE_ASPECT_RATIO):
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widthVec /= aspectRatio;
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break;
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default:
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// no need to adjust aspect ratio
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break;
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}
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osg::Geometry* pictureQuad = osg::createTexturedQuadGeometry(hints.position, widthVec, heightVec,
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0.0f, flip ? 1.0f : 0.0f , 1.0f, flip ? 0.0f : 1.0f);
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osg::Texture2D* texture = new osg::Texture2D(_vncImage.get());
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texture->setResizeNonPowerOfTwoHint(false);
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texture->setFilter(osg::Texture::MIN_FILTER,osg::Texture::LINEAR);
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texture->setWrap(osg::Texture::WRAP_S, osg::Texture::CLAMP_TO_EDGE);
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texture->setWrap(osg::Texture::WRAP_T, osg::Texture::CLAMP_TO_EDGE);
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pictureQuad->getOrCreateStateSet()->setTextureAttributeAndModes(0,
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texture,
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osg::StateAttribute::ON);
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osg::ref_ptr<osgViewer::InteractiveImageHandler> iih = new osgViewer::InteractiveImageHandler(_vncImage.get());
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pictureQuad->setEventCallback(iih.get());
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pictureQuad->setCullCallback(iih.get());
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addDrawable(pictureQuad);
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return true;
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}
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bool VncClient::connect(const std::string& hostname, const GeometryHints& hints)
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{
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osg::ref_ptr<osg::Image> image = osgDB::readRefImageFile(hostname+".vnc");
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return assign(dynamic_cast<VncImage*>(image.get()), hints);
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}
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void VncClient::close()
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{
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if (!_vncImage) return;
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_vncImage->close();
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}
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