When viewer width or height is equal to zero, division by zero occurs
in GraphicsContext::resizedImplementation(). It breaks camera projection
matrix and the scene is not drawn.
Many people have already experienced this issue when viewer is added as
QWidget to QTabWidget or QMdiArea. See
http://forum.openscenegraph.org/viewtopic.php?t=7239
In the attached GraphicsContext.cpp file call to
GraphicsContext::resizedImplementation() is ignored in the case any
dimension is equal to zero. This fixes the issue for me.
Base version of OSG is 3.2.1, published in stable releases.
-----
Best regards, Mikhail Matrosov
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* OpenSceneGraph Public License for more details.
*/
#include <stdlib.h>
#include <osg/GraphicsContext>
#include <osg/Camera>
#include <osg/View>
#include <osg/GLObjects>
#include <osg/FrameBufferObject>
#include <osg/Program>
#include <osg/Drawable>
#include <osg/FragmentProgram>
#include <osg/VertexProgram>
#include <OpenThreads/ReentrantMutex>
#include <osg/Notify>
#include <map>
#include <sstream>
#include <algorithm>
#include <iterator>
using namespace osg;
/////////////////////////////////////////////////////////////////////////////
// Use a static reference pointer to hold the window system interface.
// Wrap this within a function, in order to control the order in which
// the static pointer's constructor is executed.
static ref_ptr<GraphicsContext::WindowingSystemInterface> &windowingSystemInterfaceRef()
{
static ref_ptr<GraphicsContext::WindowingSystemInterface> s_WindowingSystemInterface;
return s_WindowingSystemInterface;
}
// GraphicsContext static method implementations
void GraphicsContext::setWindowingSystemInterface(WindowingSystemInterface* callback)
{
ref_ptr<GraphicsContext::WindowingSystemInterface> &wsref = windowingSystemInterfaceRef();
wsref = callback;
OSG_INFO<<"GraphicsContext::setWindowingSystemInterface() "<<wsref.get()<<"\t"<<&wsref<<std::endl;
}
GraphicsContext::WindowingSystemInterface* GraphicsContext::getWindowingSystemInterface()
{
ref_ptr<GraphicsContext::WindowingSystemInterface> &wsref = windowingSystemInterfaceRef();
OSG_INFO<<"GraphicsContext::getWindowingSystemInterface() "<<wsref.get()<<"\t"<<&wsref<<std::endl;
return wsref.get();
}
GraphicsContext* GraphicsContext::createGraphicsContext(Traits* traits)
{
ref_ptr<GraphicsContext::WindowingSystemInterface> &wsref = windowingSystemInterfaceRef();
if ( wsref.valid())
{
// catch any undefined values.
if (traits) traits->setUndefinedScreenDetailsToDefaultScreen();
return wsref->createGraphicsContext(traits);
}
else
return 0;
}
GraphicsContext::ScreenIdentifier::ScreenIdentifier():
displayNum(0),
screenNum(0) {}
GraphicsContext::ScreenIdentifier::ScreenIdentifier(int in_screenNum):
displayNum(0),
screenNum(in_screenNum) {}
GraphicsContext::ScreenIdentifier::ScreenIdentifier(const std::string& in_hostName,int in_displayNum, int in_screenNum):
hostName(in_hostName),
displayNum(in_displayNum),
screenNum(in_screenNum) {}
std::string GraphicsContext::ScreenIdentifier::displayName() const
{
std::stringstream ostr;
ostr<<hostName<<":"<<displayNum<<"."<<screenNum;
return ostr.str();
}
void GraphicsContext::ScreenIdentifier::readDISPLAY()
{
const char* ptr = 0;
if ((ptr=getenv("DISPLAY")) != 0)
{
setScreenIdentifier(ptr);
}
}
void GraphicsContext::ScreenIdentifier::setScreenIdentifier(const std::string& displayName)
{
std::string::size_type colon = displayName.find_last_of(':');
std::string::size_type point = displayName.find_last_of('.');
// handle the case where the host name is supplied with '.' such as 127.0.0.1:0 with only DisplayNum provided
// here the point to picks up on the .1 from the host name, rather then demarking the DisplayNum/ScreenNum as
// no ScreenNum is provided, hence no . in the rhs of the :
if (point!=std::string::npos &&
colon!=std::string::npos &&
point < colon) point = std::string::npos;
if (colon==std::string::npos)
{
hostName = "";
}
else
{
hostName = displayName.substr(0,colon);
}
std::string::size_type startOfDisplayNum = (colon==std::string::npos) ? 0 : colon+1;
std::string::size_type endOfDisplayNum = (point==std::string::npos) ? displayName.size() : point;
if (startOfDisplayNum<endOfDisplayNum)
{
displayNum = atoi(displayName.substr(startOfDisplayNum,endOfDisplayNum-startOfDisplayNum).c_str());
}
else
{
displayNum = -1;
}
if (point!=std::string::npos && point+1<displayName.size())
{
screenNum = atoi(displayName.substr(point+1,displayName.size()-point-1).c_str());
}
else
{
screenNum = -1;
}
#if 0
OSG_NOTICE<<" hostName ["<<hostName<<"]"<<std::endl;
OSG_NOTICE<<" displayNum "<<displayNum<<std::endl;
OSG_NOTICE<<" screenNum "<<screenNum<<std::endl;
#endif
}
GraphicsContext::Traits::Traits(DisplaySettings* ds):
x(0),
y(0),
width(0),
height(0),
windowDecoration(false),
supportsResize(true),
red(8),
blue(8),
green(8),
alpha(0),
depth(24),
stencil(0),
sampleBuffers(0),
samples(0),
pbuffer(false),
quadBufferStereo(false),
doubleBuffer(false),
target(0),
format(0),
level(0),
face(0),
mipMapGeneration(false),
vsync(true),
swapGroupEnabled(false),
swapGroup(0),
swapBarrier(0),
useMultiThreadedOpenGLEngine(false),
useCursor(true),
glContextVersion("1.0"),
glContextFlags(0),
glContextProfileMask(0),
sharedContext(0),
setInheritedWindowPixelFormat(false),
overrideRedirect(false),
swapMethod( DisplaySettings::SWAP_DEFAULT )
{
if (ds)
{
alpha = ds->getMinimumNumAlphaBits();
stencil = ds->getMinimumNumStencilBits();
if (ds->getMultiSamples()!=0) sampleBuffers = 1;
samples = ds->getNumMultiSamples();
if (ds->getStereo())
{
switch(ds->getStereoMode())
{
case(osg::DisplaySettings::QUAD_BUFFER): quadBufferStereo = true; break;
case(osg::DisplaySettings::VERTICAL_INTERLACE):
case(osg::DisplaySettings::CHECKERBOARD):
case(osg::DisplaySettings::HORIZONTAL_INTERLACE): stencil = 8; break;
default: break;
}
}
glContextVersion = ds->getGLContextVersion();
glContextFlags = ds->getGLContextFlags();
glContextProfileMask = ds->getGLContextProfileMask();
swapMethod = ds->getSwapMethod();
}
}
bool GraphicsContext::Traits::getContextVersion(unsigned int& major, unsigned int& minor) const
{
if (glContextVersion.empty()) return false;
std::istringstream istr( glContextVersion );
unsigned char dot;
istr >> major >> dot >> minor;
return true;
}
class ContextData
{
public:
ContextData():
_numContexts(0) {}
unsigned int _numContexts;
void incrementUsageCount() { ++_numContexts; }
void decrementUsageCount()
{
--_numContexts;
OSG_INFO<<"decrementUsageCount()"<<_numContexts<<std::endl;
if (_numContexts <= 1 && _compileContext.valid())
{
OSG_INFO<<"resetting compileContext "<<_compileContext.get()<<" refCount "<<_compileContext->referenceCount()<<std::endl;
_compileContext = 0;
}
}
osg::ref_ptr<osg::GraphicsContext> _compileContext;
};
typedef std::map<unsigned int, ContextData> ContextIDMap;
static ContextIDMap s_contextIDMap;
static OpenThreads::ReentrantMutex s_contextIDMapMutex;
static GraphicsContext::GraphicsContexts s_registeredContexts;
unsigned int GraphicsContext::createNewContextID()
{
OpenThreads::ScopedLock<OpenThreads::Mutex> lock(s_contextIDMapMutex);
// first check to see if we can reuse contextID;
for(ContextIDMap::iterator itr = s_contextIDMap.begin();
itr != s_contextIDMap.end();
++itr)
{
if (itr->second._numContexts == 0)
{
// reuse contextID;
itr->second._numContexts = 1;
OSG_INFO<<"GraphicsContext::createNewContextID() reusing contextID="<<itr->first<<std::endl;
return itr->first;
}
}
unsigned int contextID = s_contextIDMap.size();
s_contextIDMap[contextID]._numContexts = 1;
OSG_INFO<<"GraphicsContext::createNewContextID() creating contextID="<<contextID<<std::endl;
OSG_INFO<<"Updating the MaxNumberOfGraphicsContexts to "<<contextID+1<<std::endl;
// update the the maximum number of graphics contexts,
// to ensure that texture objects and display buffers are configured to the correct size.
osg::DisplaySettings::instance()->setMaxNumberOfGraphicsContexts( contextID + 1 );
return contextID;
}
unsigned int GraphicsContext::getMaxContextID()
{
OpenThreads::ScopedLock<OpenThreads::Mutex> lock(s_contextIDMapMutex);
unsigned int maxContextID = 0;
for(ContextIDMap::iterator itr = s_contextIDMap.begin();
itr != s_contextIDMap.end();
++itr)
{
if (itr->first > maxContextID) maxContextID = itr->first;
}
return maxContextID;
}
void GraphicsContext::incrementContextIDUsageCount(unsigned int contextID)
{
OpenThreads::ScopedLock<OpenThreads::Mutex> lock(s_contextIDMapMutex);
s_contextIDMap[contextID].incrementUsageCount();
OSG_INFO<<"GraphicsContext::incrementContextIDUsageCount("<<contextID<<") to "<<s_contextIDMap[contextID]._numContexts<<std::endl;
}
void GraphicsContext::decrementContextIDUsageCount(unsigned int contextID)
{
OpenThreads::ScopedLock<OpenThreads::Mutex> lock(s_contextIDMapMutex);
if (s_contextIDMap[contextID]._numContexts!=0)
{
s_contextIDMap[contextID].decrementUsageCount();
}
else
{
OSG_NOTICE<<"Warning: decrementContextIDUsageCount("<<contextID<<") called on expired contextID."<<std::endl;
}
OSG_INFO<<"GraphicsContext::decrementContextIDUsageCount("<<contextID<<") to "<<s_contextIDMap[contextID]._numContexts<<std::endl;
}
void GraphicsContext::registerGraphicsContext(GraphicsContext* gc)
{
OSG_INFO<<"GraphicsContext::registerGraphicsContext "<<gc<<std::endl;
if (!gc) return;
OpenThreads::ScopedLock<OpenThreads::Mutex> lock(s_contextIDMapMutex);
GraphicsContexts::iterator itr = std::find(s_registeredContexts.begin(), s_registeredContexts.end(), gc);
if (itr != s_registeredContexts.end()) s_registeredContexts.erase(itr);
s_registeredContexts.push_back(gc);
}
void GraphicsContext::unregisterGraphicsContext(GraphicsContext* gc)
{
OSG_INFO<<"GraphicsContext::unregisterGraphicsContext "<<gc<<std::endl;
if (!gc) return;
OpenThreads::ScopedLock<OpenThreads::Mutex> lock(s_contextIDMapMutex);
GraphicsContexts::iterator itr = std::find(s_registeredContexts.begin(), s_registeredContexts.end(), gc);
if (itr != s_registeredContexts.end()) s_registeredContexts.erase(itr);
}
GraphicsContext::GraphicsContexts GraphicsContext::getAllRegisteredGraphicsContexts()
{
OSG_INFO<<"GraphicsContext::getAllRegisteredGraphicsContexts s_registeredContexts.size()="<<s_registeredContexts.size()<<std::endl;
OpenThreads::ScopedLock<OpenThreads::Mutex> lock(s_contextIDMapMutex);
return s_registeredContexts;
}
GraphicsContext::GraphicsContexts GraphicsContext::getRegisteredGraphicsContexts(unsigned int contextID)
{
GraphicsContexts contexts;
OpenThreads::ScopedLock<OpenThreads::Mutex> lock(s_contextIDMapMutex);
for(GraphicsContexts::iterator itr = s_registeredContexts.begin();
itr != s_registeredContexts.end();
++itr)
{
GraphicsContext* gc = *itr;
if (gc->getState() && gc->getState()->getContextID()==contextID) contexts.push_back(gc);
}
OSG_INFO<<"GraphicsContext::getRegisteredGraphicsContexts "<<contextID<<" contexts.size()="<<contexts.size()<<std::endl;
return contexts;
}
GraphicsContext* GraphicsContext::getOrCreateCompileContext(unsigned int contextID)
{
OSG_NOTICE<<"GraphicsContext::createCompileContext."<<std::endl;
{
OpenThreads::ScopedLock<OpenThreads::Mutex> lock(s_contextIDMapMutex);
if (s_contextIDMap[contextID]._compileContext.valid()) return s_contextIDMap[contextID]._compileContext.get();
}
GraphicsContext::GraphicsContexts contexts = GraphicsContext::getRegisteredGraphicsContexts(contextID);
if (contexts.empty()) return 0;
GraphicsContext* src_gc = contexts.front();
const osg::GraphicsContext::Traits* src_traits = src_gc->getTraits();
osg::GraphicsContext::Traits* traits = new osg::GraphicsContext::Traits;
traits->screenNum = src_traits->screenNum;
traits->displayNum = src_traits->displayNum;
traits->hostName = src_traits->hostName;
traits->width = 100;
traits->height = 100;
traits->red = src_traits->red;
traits->green = src_traits->green;
traits->blue = src_traits->blue;
traits->alpha = src_traits->alpha;
traits->depth = src_traits->depth;
traits->sharedContext = src_gc;
traits->pbuffer = true;
osg::ref_ptr<osg::GraphicsContext> gc = osg::GraphicsContext::createGraphicsContext(traits);
if (gc.valid() && gc->realize())
{
OpenThreads::ScopedLock<OpenThreads::Mutex> lock(s_contextIDMapMutex);
s_contextIDMap[contextID]._compileContext = gc;
OSG_NOTICE<<" succeeded GraphicsContext::createCompileContext."<<std::endl;
return gc.release();
}
else
{
return 0;
}
}
void GraphicsContext::setCompileContext(unsigned int contextID, GraphicsContext* gc)
{
OpenThreads::ScopedLock<OpenThreads::Mutex> lock(s_contextIDMapMutex);
s_contextIDMap[contextID]._compileContext = gc;
}
GraphicsContext* GraphicsContext::getCompileContext(unsigned int contextID)
{
// OSG_NOTICE<<"GraphicsContext::getCompileContext "<<contextID<<std::endl;
OpenThreads::ScopedLock<OpenThreads::Mutex> lock(s_contextIDMapMutex);
ContextIDMap::iterator itr = s_contextIDMap.find(contextID);
if (itr != s_contextIDMap.end()) return itr->second._compileContext.get();
else return 0;
}
/////////////////////////////////////////////////////////////////////////////
//
// GraphicsContext standard method implementations
//
GraphicsContext::GraphicsContext():
_clearColor(osg::Vec4(0.0f,0.0f,0.0f,1.0f)),
_clearMask(0),
_threadOfLastMakeCurrent(0),
_lastClearTick(0),
_defaultFboId(0)
{
setThreadSafeRefUnref(true);
_operationsBlock = new RefBlock;
registerGraphicsContext(this);
}
GraphicsContext::GraphicsContext(const GraphicsContext&, const osg::CopyOp&):
_clearColor(osg::Vec4(0.0f,0.0f,0.0f,1.0f)),
_clearMask(0),
_threadOfLastMakeCurrent(0),
_lastClearTick(0),
_defaultFboId(0)
{
setThreadSafeRefUnref(true);
_operationsBlock = new RefBlock;
registerGraphicsContext(this);
}
GraphicsContext::~GraphicsContext()
{
close(false);
unregisterGraphicsContext(this);
}
void GraphicsContext::clear()
{
_lastClearTick = osg::Timer::instance()->tick();
if (_clearMask==0 || !_traits) return;
glViewport(0, 0, _traits->width, _traits->height);
glScissor(0, 0, _traits->width, _traits->height);
glClearColor( _clearColor[0], _clearColor[1], _clearColor[2], _clearColor[3]);
glClear( _clearMask );
}
bool GraphicsContext::realize()
{
if (realizeImplementation())
{
return true;
}
else
{
return false;
}
}
void GraphicsContext::close(bool callCloseImplementation)
{
OSG_INFO<<"close("<<callCloseImplementation<<")"<<this<<std::endl;
// switch off the graphics thread...
setGraphicsThread(0);
bool sharedContextExists = false;
if (_state.valid())
{
OpenThreads::ScopedLock<OpenThreads::Mutex> lock(s_contextIDMapMutex);
if (s_contextIDMap[_state->getContextID()]._numContexts>1) sharedContextExists = true;
}
// release all the OpenGL objects in the scene graphs associated with this
for(Cameras::iterator itr = _cameras.begin();
itr != _cameras.end();
++itr)
{
Camera* camera = (*itr);
if (camera)
{
OSG_INFO<<"Releasing GL objects for Camera="<<camera<<" _state="<<_state.get()<<std::endl;
camera->releaseGLObjects(_state.get());
}
}
bool contextIDValid = _state.valid();
unsigned int contextID = _state.valid() ? _state->getContextID() : ~0U;
if (callCloseImplementation && _state.valid() && isRealized())
{
OSG_INFO<<"Closing still viable window "<<sharedContextExists<<" _state->getContextID()="<<_state->getContextID()<<std::endl;
if (makeCurrent())
{
if ( !sharedContextExists )
{
OSG_INFO<<"Doing delete of GL objects"<<std::endl;
_state->reset();
// Kill the State now so all the (directly or indirectly) referenced GLObjects can make it into delete cache in time.
// That way osg::deleteAllGLObjects won't miss them and left them to be deleted afterwards in a new GraphicsContext
// that happens to have the same contextID (see SceneView::draw() and _requiresFlush flag).
_state = 0;
osg::deleteAllGLObjects(contextID);
OSG_INFO<<"Done delete of GL objects"<<std::endl;
}
else
{
// If the GL objects are shared with other contexts then only flush those
// which have already been deleted
osg::flushAllDeletedGLObjects(_state->getContextID());
_state->reset();
}
releaseContext();
}
else
{
OSG_INFO<<"makeCurrent did not succeed, could not do flush/deletion of OpenGL objects."<<std::endl;
}
}
if (callCloseImplementation) closeImplementation();
// now discard any deleted deleted OpenGL objects that the are still hanging around - such as due to
// the the flushDelete*() methods not being invoked, such as when using GraphicContextEmbedded where makeCurrent
// does not work.
if ( !sharedContextExists && contextIDValid)
{
OSG_INFO<<"Doing discard of deleted OpenGL objects."<<std::endl;
osg::discardAllGLObjects(contextID);
}
if (contextIDValid)
{
decrementContextIDUsageCount(contextID);
if (_state.valid()) _state = 0;
}
}
bool GraphicsContext::makeCurrent()
{
_threadOfLastMakeCurrent = OpenThreads::Thread::CurrentThread();
bool result = makeCurrentImplementation();
if (result)
{
// initialize extension process, not only initializes on first
// call, will be a non-op on subsequent calls.
getState()->initializeExtensionProcs();
}
return result;
}
bool GraphicsContext::makeContextCurrent(GraphicsContext* readContext)
{
bool result = makeContextCurrentImplementation(readContext);
if (result)
{
_threadOfLastMakeCurrent = OpenThreads::Thread::CurrentThread();
// initialize extension process, not only initializes on first
// call, will be a non-op on subsequent calls.
getState()->initializeExtensionProcs();
}
return result;
}
bool GraphicsContext::releaseContext()
{
bool result = releaseContextImplementation();
_threadOfLastMakeCurrent = (OpenThreads::Thread*)(-1);
return result;
}
void GraphicsContext::swapBuffers()
{
if (isCurrent())
{
swapBuffersCallbackOrImplemenation();
clear();
}
else if (_graphicsThread.valid() &&
_threadOfLastMakeCurrent == _graphicsThread.get())
{
_graphicsThread->add(new SwapBuffersOperation);
}
else
{
makeCurrent();
swapBuffersCallbackOrImplemenation();
clear();
}
}
void GraphicsContext::createGraphicsThread()
{
if (!_graphicsThread)
{
setGraphicsThread(new GraphicsThread);
}
}
void GraphicsContext::setGraphicsThread(GraphicsThread* gt)
{
if (_graphicsThread==gt) return;
if (_graphicsThread.valid())
{
// need to kill the thread in some way...
_graphicsThread->cancel();
_graphicsThread->setParent(0);
}
_graphicsThread = gt;
if (_graphicsThread.valid())
{
_graphicsThread->setParent(this);
}
}
void GraphicsContext::add(Operation* operation)
{
OSG_INFO<<"Doing add"<<std::endl;
// acquire the lock on the operations queue to prevent anyone else for modifying it at the same time
OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_operationsMutex);
// add the operation to the end of the list
_operations.push_back(operation);
_operationsBlock->set(true);
}
void GraphicsContext::remove(Operation* operation)
{
OSG_INFO<<"Doing remove operation"<<std::endl;
// acquire the lock on the operations queue to prevent anyone else for modifying it at the same time
OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_operationsMutex);
for(GraphicsOperationQueue::iterator itr = _operations.begin();
itr!=_operations.end();)
{
if ((*itr)==operation) itr = _operations.erase(itr);
else ++itr;
}
if (_operations.empty())
{
_operationsBlock->set(false);
}
}
void GraphicsContext::remove(const std::string& name)
{
OSG_INFO<<"Doing remove named operation"<<std::endl;
// acquire the lock on the operations queue to prevent anyone else for modifying it at the same time
OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_operationsMutex);
// find the remove all operations with specified name
for(GraphicsOperationQueue::iterator itr = _operations.begin();
itr!=_operations.end();)
{
if ((*itr)->getName()==name) itr = _operations.erase(itr);
else ++itr;
}
if (_operations.empty())
{
_operationsBlock->set(false);
}
}
void GraphicsContext::removeAllOperations()
{
OSG_INFO<<"Doing remove all operations"<<std::endl;
OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_operationsMutex);
_operations.clear();
_operationsBlock->set(false);
}
void GraphicsContext::runOperations()
{
// sort the cameras into order
typedef std::vector<Camera*> CameraVector;
CameraVector camerasCopy;
std::copy(_cameras.begin(), _cameras.end(), std::back_inserter(camerasCopy));
std::sort(camerasCopy.begin(), camerasCopy.end(), CameraRenderOrderSortOp());
for(CameraVector::iterator itr = camerasCopy.begin();
itr != camerasCopy.end();
++itr)
{
osg::Camera* camera = *itr;
if (camera->getRenderer()) (*(camera->getRenderer()))(this);
}
for(GraphicsOperationQueue::iterator itr = _operations.begin();
itr != _operations.end();
)
{
{
OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_operationsMutex);
_currentOperation = *itr;
if (!_currentOperation->getKeep())
{
itr = _operations.erase(itr);
if (_operations.empty())
{
_operationsBlock->set(false);
}
}
else
{
++itr;
}
}
if (_currentOperation.valid())
{
// OSG_INFO<<"Doing op "<<_currentOperation->getName()<<" "<<this<<std::endl;
// call the graphics operation.
(*_currentOperation)(this);
{
OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_operationsMutex);
_currentOperation = 0;
}
}
}
}
void GraphicsContext::addCamera(osg::Camera* camera)
{
_cameras.push_back(camera);
}
void GraphicsContext::removeCamera(osg::Camera* camera)
{
Cameras::iterator itr = std::find(_cameras.begin(), _cameras.end(), camera);
if (itr != _cameras.end())
{
// find a set of nodes attached the camera that we are removing that isn't
// shared by any other cameras on this GraphicsContext
typedef std::set<Node*> NodeSet;
NodeSet nodes;
for(unsigned int i=0; i<camera->getNumChildren(); ++i)
{
nodes.insert(camera->getChild(i));
}
for(Cameras::iterator citr = _cameras.begin();
citr != _cameras.end();
++citr)
{
if (citr != itr)
{
osg::Camera* otherCamera = *citr;
for(unsigned int i=0; i<otherCamera->getNumChildren(); ++i)
{
NodeSet::iterator nitr = nodes.find(otherCamera->getChild(i));
if (nitr != nodes.end()) nodes.erase(nitr);
}
}
}
// now release the GLobjects associated with these non shared nodes
for(NodeSet::iterator nitr = nodes.begin();
nitr != nodes.end();
++nitr)
{
const_cast<osg::Node*>(*nitr)->releaseGLObjects(_state.get());
}
// release the context of the any RenderingCache that the Camera has.
if (camera->getRenderingCache())
{
camera->getRenderingCache()->releaseGLObjects(_state.get());
}
_cameras.erase(itr);
}
}
void GraphicsContext::resizedImplementation(int x, int y, int width, int height)
{
if (!_traits) return;
// Avoid division by zero. These values will otherwise be saved to _traits
// and used as denominator during the next call to the routine.
if (width == 0 || height == 0)
{
return;
}
std::set<osg::Viewport*> processedViewports;
double widthChangeRatio = double(width) / double(_traits->width);
double heigtChangeRatio = double(height) / double(_traits->height);
double aspectRatioChange = widthChangeRatio / heigtChangeRatio;
for(Cameras::iterator itr = _cameras.begin();
itr != _cameras.end();
++itr)
{
Camera* camera = (*itr);
// resize doesn't affect Cameras set up with FBO's.
if (camera->getRenderTargetImplementation()==osg::Camera::FRAME_BUFFER_OBJECT) continue;
Viewport* viewport = camera->getViewport();
if (viewport)
{
// avoid processing a shared viewport twice
if (processedViewports.count(viewport)==0)
{
processedViewports.insert(viewport);
if (viewport->x()==0 && viewport->y()==0 &&
viewport->width()>=_traits->width && viewport->height()>=_traits->height)
{
viewport->setViewport(0,0,width,height);
}
else
{
viewport->x() = static_cast<osg::Viewport::value_type>(double(viewport->x())*widthChangeRatio);
viewport->y() = static_cast<osg::Viewport::value_type>(double(viewport->y())*heigtChangeRatio);
viewport->width() = static_cast<osg::Viewport::value_type>(double(viewport->width())*widthChangeRatio);
viewport->height() = static_cast<osg::Viewport::value_type>(double(viewport->height())*heigtChangeRatio);
}
}
}
// if aspect ratio adjusted change the project matrix to suit.
if (aspectRatioChange != 1.0)
{
osg::View* view = camera->getView();
osg::View::Slave* slave = view ? view->findSlaveForCamera(camera) : 0;
if (slave)
{
if (camera->getReferenceFrame()==osg::Transform::RELATIVE_RF)
{
switch(view->getCamera()->getProjectionResizePolicy())
{
case(osg::Camera::HORIZONTAL): slave->_projectionOffset *= osg::Matrix::scale(1.0/aspectRatioChange,1.0,1.0); break;
case(osg::Camera::VERTICAL): slave->_projectionOffset *= osg::Matrix::scale(1.0, aspectRatioChange,1.0); break;
default: break;
}
}
else
{
switch(camera->getProjectionResizePolicy())
{
case(osg::Camera::HORIZONTAL): camera->getProjectionMatrix() *= osg::Matrix::scale(1.0/aspectRatioChange,1.0,1.0); break;
case(osg::Camera::VERTICAL): camera->getProjectionMatrix() *= osg::Matrix::scale(1.0, aspectRatioChange,1.0); break;
default: break;
}
}
}
else
{
Camera::ProjectionResizePolicy policy = view ? view->getCamera()->getProjectionResizePolicy() : camera->getProjectionResizePolicy();
switch(policy)
{
case(osg::Camera::HORIZONTAL): camera->getProjectionMatrix() *= osg::Matrix::scale(1.0/aspectRatioChange,1.0,1.0); break;
case(osg::Camera::VERTICAL): camera->getProjectionMatrix() *= osg::Matrix::scale(1.0, aspectRatioChange,1.0); break;
default: break;
}
osg::Camera* master = view ? view->getCamera() : 0;
if (view && camera==master)
{
for(unsigned int i=0; i<view->getNumSlaves(); ++i)
{
osg::View::Slave& child = view->getSlave(i);
if (child._camera.valid() && child._camera->getReferenceFrame()==osg::Transform::RELATIVE_RF)
{
// scale the slaves by the inverse of the change that has been applied to master, to avoid them be
// scaled twice (such as when both master and slave are on the same GraphicsContexts) or by the wrong scale
// when master and slave are on different GraphicsContexts.
switch(policy)
{
case(osg::Camera::HORIZONTAL): child._projectionOffset *= osg::Matrix::scale(aspectRatioChange,1.0,1.0); break;
case(osg::Camera::VERTICAL): child._projectionOffset *= osg::Matrix::scale(1.0, 1.0/aspectRatioChange,1.0); break;
default: break;
}
}
}
}
}
}
}
_traits->x = x;
_traits->y = y;
_traits->width = width;
_traits->height = height;
}
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