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flightgear/utils/fgviewer/Viewer.cxx
Mathias Froehlich 243929274b fgviewer: Import hla based viewer application.
2012-12-16 16:52:28 +01:00

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// Viewer.cxx -- alternative flightgear viewer application
//
// Copyright (C) 2009 - 2012 Mathias Froehlich
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version.
//
// This program 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 GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "Viewer.hxx"
#include <osg/ArgumentParser>
#include <osg/ProxyNode>
#include <osg/PagedLOD>
#include <osgDB/ReadFile>
#ifdef __linux__
#include <X11/Xlib.h>
#include <osgViewer/api/X11/GraphicsWindowX11>
#endif
#include "MEncoderCaptureOperation.hxx"
namespace fgviewer {
Viewer::Viewer(osg::ArgumentParser& arguments) :
osgViewer::Viewer(arguments),
_sceneDataGroup(new osg::Group),
_timeIncrement(SGTimeStamp::fromSec(0)),
_simTime(SGTimeStamp::fromSec(0))
{
/// Careful: this method really assigns the sceneDataGroup to all cameras!
/// FIXME the 'useMasterScene' flag at the slave is able to get around that!!!
osgViewer::Viewer::setSceneData(_sceneDataGroup.get());
/// The only changed default that is renderer independent ...
getCamera()->setClearColor(osg::Vec4(0, 0, 0, 0));
}
Viewer::~Viewer()
{
stopThreading();
#ifdef FG_HAVE_HLA
if (_viewerFederate.valid())
_viewerFederate->shutdown();
_viewerFederate = 0;
#endif
}
bool
Viewer::readCameraConfig(const SGPropertyNode& viewerNode)
{
// Collect and realize all windows
for (int i = 0; i < viewerNode.nChildren(); ++i) {
// FIXME support window, fullscreen, offscreen
const SGPropertyNode* windowNode = viewerNode.getChild(i);
if (!windowNode || windowNode->getNameString() != "window")
continue;
std::string name = windowNode->getStringValue("name", "");
if (name.empty()) {
SG_LOG(SG_VIEW, SG_ALERT, "Ignoring unnamed window!");
return false;
}
Drawable* drawable = getOrCreateDrawable(name);
osg::GraphicsContext::ScreenIdentifier screenIdentifier;
screenIdentifier = getScreenIdentifier(windowNode->getStringValue("display", ""));
drawable->setScreenIdentifier(screenIdentifier.displayName());
if (windowNode->getBoolValue("fullscreen", false)) {
osg::GraphicsContext::ScreenSettings screenSettings;
screenSettings = getScreenSettings(screenIdentifier);
drawable->setPosition(SGVec2i(0, 0));
drawable->setSize(SGVec2i(screenSettings.width, screenSettings.height));
drawable->setFullscreen(true);
drawable->setOffscreen(false);
} else if (windowNode->getBoolValue("video", false)) {
drawable->setPosition(SGVec2i(0, 0));
SGVec2i size;
size[0] = windowNode->getIntValue("geometry/width", 1366);
size[1] = windowNode->getIntValue("geometry/height", 768);
drawable->setSize(size);
drawable->setFullscreen(true);
drawable->setOffscreen(true);
std::string outputFile = windowNode->getStringValue("output-file", "fgviewer.avi");
unsigned fps = windowNode->getIntValue("frames-per-second", 30);
/// This is the case for the video writers, have a fixed time increment
_timeIncrement = SGTimeStamp::fromSec(1.0/fps);
MEncoderCaptureOperation* captureOperation;
captureOperation = new MEncoderCaptureOperation(outputFile, fps);
osgViewer::ScreenCaptureHandler* captureHandler;
captureHandler = new osgViewer::ScreenCaptureHandler(captureOperation, -1);
addEventHandler(captureHandler);
captureHandler->startCapture();
} else {
SGVec2i position;
position[0] = windowNode->getIntValue("geometry/x", 0);
position[1] = windowNode->getIntValue("geometry/y", 0);
drawable->setPosition(position);
SGVec2i size;
size[0] = windowNode->getIntValue("geometry/width", 1366);
size[1] = windowNode->getIntValue("geometry/height", 768);
drawable->setSize(size);
drawable->setFullscreen(false);
drawable->setOffscreen(false);
}
}
for (int i = 0; i < viewerNode.nChildren(); ++i) {
const SGPropertyNode* cameraNode = viewerNode.getChild(i);
if (!cameraNode || cameraNode->getNameString() != "camera")
continue;
std::string name = cameraNode->getStringValue("name", "");
if (name.empty()) {
SG_LOG(SG_VIEW, SG_ALERT, "Camera configuration needs a name!");
return false;
}
SlaveCamera* slaveCamera = getOrCreateSlaveCamera(name);
std::string drawableName = cameraNode->getStringValue("window", "");
if (drawableName.empty()) {
SG_LOG(SG_VIEW, SG_ALERT, "Camera configuration needs an assigned window!");
return false;
}
Drawable* drawable = getDrawable(drawableName);
if (!drawable) {
SG_LOG(SG_VIEW, SG_ALERT, "Camera configuration \"" << name << "\" needs a drawable configured!");
return false;
}
slaveCamera->setDrawableName(drawableName);
drawable->attachSlaveCamera(slaveCamera);
SGVec2i size = drawable->getSize();
SGVec4i viewport(0, 0, size[0], size[1]);
viewport[0] = cameraNode->getIntValue("viewport/x", viewport[0]);
viewport[1] = cameraNode->getIntValue("viewport/y", viewport[1]);
viewport[2] = cameraNode->getIntValue("viewport/width", viewport[2]);
viewport[3] = cameraNode->getIntValue("viewport/height", viewport[3]);
slaveCamera->setViewport(viewport);
double headingDeg = cameraNode->getDoubleValue("view-offset/heading-deg", 0);
double pitchDeg = cameraNode->getDoubleValue("view-offset/pitch-deg", 0);
double rollDeg = cameraNode->getDoubleValue("view-offset/roll-deg", 0);
slaveCamera->setViewOffsetDeg(headingDeg, pitchDeg, rollDeg);
// Care for the reference points
if (const SGPropertyNode* referencePointsNode = cameraNode->getNode("reference-points")) {
for (int j = 0; j < referencePointsNode->nChildren(); ++j) {
const SGPropertyNode* referencePointNode = cameraNode->getNode("reference-point");
if (!referencePointNode)
continue;
std::string name = referencePointNode->getStringValue("name", "");
if (name.empty())
continue;
osg::Vec2 point;
point[0] = referencePointNode->getDoubleValue("x", 0);
point[1] = referencePointNode->getDoubleValue("y", 0);
slaveCamera->setProjectionReferencePoint(name, point);
}
}
// Define 4 reference points by monitor dimensions
else if (const SGPropertyNode* physicalDimensionsNode = cameraNode->getNode("physical-dimensions")) {
double physicalWidth = physicalDimensionsNode->getDoubleValue("width", viewport[2]);
double physicalHeight = physicalDimensionsNode->getDoubleValue("height", viewport[3]);
if (const SGPropertyNode* bezelNode = physicalDimensionsNode->getNode("bezel")) {
double bezelHeightTop = bezelNode->getDoubleValue("top", 0);
double bezelHeightBottom = bezelNode->getDoubleValue("bottom", 0);
double bezelWidthLeft = bezelNode->getDoubleValue("left", 0);
double bezelWidthRight = bezelNode->getDoubleValue("right", 0);
slaveCamera->setMonitorProjectionReferences(physicalWidth, physicalHeight,
bezelHeightTop, bezelHeightBottom,
bezelWidthLeft, bezelWidthRight);
}
}
// The frustum node takes precedence, as this is the most explicit one.
if (const SGPropertyNode* frustumNode = cameraNode->getNode("frustum")) {
Frustum frustum(slaveCamera->getAspectRatio());
frustum._near = frustumNode->getDoubleValue("near", frustum._near);
frustum._left = frustumNode->getDoubleValue("left", frustum._left);
frustum._right = frustumNode->getDoubleValue("right", frustum._right);
frustum._bottom = frustumNode->getDoubleValue("bottom", frustum._bottom);
frustum._top = frustumNode->getDoubleValue("top", frustum._top);
slaveCamera->setFrustum(frustum);
} else if (const SGPropertyNode* perspectiveNode = cameraNode->getNode("perspective")) {
double fieldOfViewDeg = perspectiveNode->getDoubleValue("field-of-view-deg", 55);
slaveCamera->setFustumByFieldOfViewDeg(fieldOfViewDeg);
} else if (const SGPropertyNode* monitorNode = cameraNode->getNode("monitor")) {
std::string referenceCameraName;
std::string names[2];
std::string referenceNames[2];
// FIXME??!!
if (const SGPropertyNode* leftOfNode = monitorNode->getNode("left-of")) {
referenceCameraName = leftOfNode->getStringValue("");
names[0] = "lowerRight";
referenceNames[0] = "lowerLeft";
names[1] = "upperRight";
referenceNames[1] = "upperLeft";
} else if (const SGPropertyNode* rightOfNode = monitorNode->getNode("right-of")) {
referenceCameraName = rightOfNode->getStringValue("");
names[0] = "lowerLeft";
referenceNames[0] = "lowerRight";
names[1] = "upperLeft";
referenceNames[1] = "upperRight";
} else if (const SGPropertyNode* aboveNode = monitorNode->getNode("above")) {
referenceCameraName = aboveNode->getStringValue("");
names[0] = "lowerLeft";
referenceNames[0] = "upperLeft";
names[1] = "lowerRight";
referenceNames[1] = "upperRight";
} else if (const SGPropertyNode* belowNode = monitorNode->getNode("below")) {
referenceCameraName = belowNode->getStringValue("");
names[0] = "upperLeft";
referenceNames[0] = "lowerLeft";
names[1] = "upperRight";
referenceNames[1] = "lowerRight";
} else {
// names[0] = ;
// referenceNames[0] = ;
// names[1] = ;
// referenceNames[1] = ;
}
// If we finally found a set of reference points that should match,
// then create a relative frustum matching these references
if (SlaveCamera* referenceSlaveCamera = getSlaveCamera(referenceCameraName)) {
slaveCamera->setRelativeFrustum(names, *referenceSlaveCamera, referenceNames);
} else {
SG_LOG(SG_VIEW, SG_ALERT, "Unable to find reference camera \"" << referenceCameraName
<< "\" for camera \"" << name << "\"!");
}
} else {
// Set a proper default taking the current aspect ratio into account
slaveCamera->setFustumByFieldOfViewDeg(55);
}
}
return true;
}
void
Viewer::setupDefaultCameraConfigIfUnset()
{
if (getNumDrawables() || getNumSlaveCameras())
return;
osg::GraphicsContext::ScreenIdentifier screenIdentifier;
screenIdentifier = getDefaultScreenIdentifier();
Drawable* drawable = getOrCreateDrawable("fgviewer");
drawable->setScreenIdentifier(screenIdentifier.displayName());
drawable->setPosition(SGVec2i(0, 0));
SGVec2i size(800, 600);
drawable->setSize(size);
drawable->setFullscreen(false);
drawable->setOffscreen(false);
SlaveCamera* slaveCamera = getOrCreateSlaveCamera(drawable->getName());
slaveCamera->setDrawableName(drawable->getName());
drawable->attachSlaveCamera(slaveCamera);
slaveCamera->setViewport(SGVec4i(0, 0, size[0], size[1]));
slaveCamera->setViewOffset(osg::Matrix::identity());
slaveCamera->setFustumByFieldOfViewDeg(55);
}
bool
Viewer::readConfiguration(const std::string&)
{
return false;
}
void
Viewer::setRenderer(Renderer* renderer)
{
if (!renderer) {
SG_LOG(SG_VIEW, SG_ALERT, "Viewer::setRenderer(): Setting the renderer to zero is not supported!");
return;
}
if (_renderer.valid()) {
SG_LOG(SG_VIEW, SG_ALERT, "Viewer::setRenderer(): Setting the renderer twice is not supported!");
return;
}
_renderer = renderer;
}
Renderer*
Viewer::getRenderer()
{
return _renderer.get();
}
Drawable*
Viewer::getOrCreateDrawable(const std::string& name)
{
Drawable* drawable = getDrawable(name);
if (drawable)
return drawable;
if (!_renderer.valid())
return 0;
drawable = _renderer->createDrawable(*this, name);
if (!drawable)
return 0;
_drawableVector.push_back(drawable);
return drawable;
}
Drawable*
Viewer::getDrawable(const std::string& name)
{
return getDrawable(getDrawableIndex(name));
}
unsigned
Viewer::getDrawableIndex(const std::string& name)
{
for (DrawableVector::size_type i = 0; i < _drawableVector.size(); ++i) {
if (_drawableVector[i]->getName() == name)
return i;
}
return ~0u;
}
Drawable*
Viewer::getDrawable(unsigned index)
{
if (_drawableVector.size() <= index)
return 0;
return _drawableVector[index].get();
}
unsigned
Viewer::getNumDrawables() const
{
return _drawableVector.size();
}
SlaveCamera*
Viewer::getOrCreateSlaveCamera(const std::string& name)
{
SlaveCamera* slaveCamera = getSlaveCamera(name);
if (slaveCamera)
return slaveCamera;
if (!_renderer.valid())
return 0;
slaveCamera = _renderer->createSlaveCamera(*this, name);
if (!slaveCamera)
return 0;
_slaveCameraVector.push_back(slaveCamera);
return slaveCamera;
}
SlaveCamera*
Viewer::getSlaveCamera(const std::string& name)
{
return getSlaveCamera(getSlaveCameraIndex(name));
}
unsigned
Viewer::getSlaveCameraIndex(const std::string& name)
{
for (SlaveCameraVector::size_type i = 0; i < _slaveCameraVector.size(); ++i) {
if (_slaveCameraVector[i]->getName() == name)
return i;
}
return ~0u;
}
SlaveCamera*
Viewer::getSlaveCamera(unsigned index)
{
if (_slaveCameraVector.size() <= index)
return 0;
return _slaveCameraVector[index].get();
}
unsigned
Viewer::getNumSlaveCameras() const
{
return _slaveCameraVector.size();
}
void
Viewer::realize()
{
if (isRealized())
return;
if (!_renderer.valid())
return;
// Setup a default config if there is none
setupDefaultCameraConfigIfUnset();
// Realize
if (!_renderer->realize(*this)) {
SG_LOG(SG_VIEW, SG_ALERT, "Renderer::realize() failed!");
return;
}
osgViewer::Viewer::realize();
}
bool
Viewer::realizeDrawables()
{
for (DrawableVector::iterator i = _drawableVector.begin(); i != _drawableVector.end(); ++i) {
if (!(*i)->realize(*this)) {
SG_LOG(SG_VIEW, SG_ALERT, "Unable to realize drawable \"" << (*i)->getName() << "\"!");
return false;
}
}
return true;
}
bool
Viewer::realizeSlaveCameras()
{
for (SlaveCameraVector::iterator i = _slaveCameraVector.begin(); i != _slaveCameraVector.end(); ++i) {
if (!(*i)->realize(*this)) {
SG_LOG(SG_VIEW, SG_ALERT, "Unable to realize camera \"" << (*i)->getName() << "\"!");
return false;
}
}
return true;
}
void
Viewer::advance(double)
{
if (_timeIncrement == SGTimeStamp::fromSec(0)) {
// Flightgears current scheme - could be improoved
_simTime = SGTimeStamp::now();
} else {
// Giving an explicit time increment makes sense in presence
// of the video capture where we need deterministic
// frame times and object positions for each picture.
_simTime += _timeIncrement;
}
// This sets the frame stamps simulation time to simTime
// and schedules a frame event
osgViewer::Viewer::advance(_simTime.toSecs());
}
void
Viewer::updateTraversal()
{
#ifdef FG_HAVE_HLA
if (_viewerFederate.valid()) {
if (_timeIncrement == SGTimeStamp::fromSec(0)) {
if (!_viewerFederate->timeAdvanceAvailable()) {
SG_LOG(SG_NETWORK, SG_ALERT, "Got error from federate update!");
_viewerFederate->shutdown();
_viewerFederate = 0;
}
} else {
osg::FrameStamp* frameStamp = getViewerFrameStamp();
SGTimeStamp timeStamp = SGTimeStamp::fromSec(frameStamp->getSimulationTime());
if (!_viewerFederate->timeAdvance(timeStamp)) {
SG_LOG(SG_NETWORK, SG_ALERT, "Got error from federate update!");
_viewerFederate->shutdown();
_viewerFederate = 0;
}
}
}
#endif
osgViewer::Viewer::updateTraversal();
if (!_renderer->update(*this)) {
SG_LOG(SG_VIEW, SG_ALERT, "Renderer::update() failed!");
}
}
bool
Viewer::updateSlaveCameras()
{
for (SlaveCameraVector::iterator i = _slaveCameraVector.begin(); i != _slaveCameraVector.end(); ++i) {
if (!(*i)->update(*this)) {
SG_LOG(SG_VIEW, SG_ALERT, "SlaveCamera::update() failed!");
return false;
}
}
return true;
}
void
Viewer::setReaderWriterOptions(simgear::SGReaderWriterOptions* readerWriterOptions)
{
_readerWriterOptions = readerWriterOptions;
}
simgear::SGReaderWriterOptions*
Viewer::getReaderWriterOptions()
{
return _readerWriterOptions.get();
}
void
Viewer::setSceneData(osg::Node* node)
{
_sceneDataGroup->removeChildren(0, _sceneDataGroup->getNumChildren());
insertSceneData(node);
}
void
Viewer::insertSceneData(osg::Node* node)
{
_sceneDataGroup->addChild(node);
}
bool
Viewer::insertSceneData(const std::string& fileName, const osgDB::Options* options)
{
#if 0
osg::ProxyNode* proxyNode = new osg::ProxyNode;
if (options)
proxyNode->setDatabaseOptions(options->clone(osg::CopyOp()));
else
proxyNode->setDatabaseOptions(_readerWriterOptions->clone(osg::CopyOp()));
proxyNode->setFileName(0, fileName);
insertSceneData(proxyNode);
return true;
#else
osg::ref_ptr<osg::Node> node = osgDB::readRefNodeFile(fileName, options);
if (!node.valid())
return false;
insertSceneData(node.get());
return true;
#endif
}
osg::Group*
Viewer::getSceneDataGroup()
{
return _sceneDataGroup.get();
}
class Viewer::_PurgeLevelOfDetailNodesVisitor : public osg::NodeVisitor {
public:
_PurgeLevelOfDetailNodesVisitor() :
osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN)
{ }
virtual ~_PurgeLevelOfDetailNodesVisitor()
{ }
virtual void apply(osg::ProxyNode& node)
{
for (unsigned i = 0; i < node.getNumChildren(); ++i) {
if (node.getFileName(i).empty())
continue;
node.removeChildren(i, node.getNumChildren() - i);
break;
}
osg::NodeVisitor::apply(static_cast<osg::Group&>(node));
}
virtual void apply(osg::PagedLOD& node)
{
for (unsigned i = 0; i < node.getNumChildren(); ++i) {
if (node.getFileName(i).empty())
continue;
node.removeChildren(i, node.getNumChildren() - i);
break;
}
osg::NodeVisitor::apply(static_cast<osg::Group&>(node));
}
};
void
Viewer::purgeLevelOfDetailNodes()
{
_PurgeLevelOfDetailNodesVisitor purgeLevelOfDetailNodesVisitor;
_sceneDataGroup->accept(purgeLevelOfDetailNodesVisitor);
}
osg::GraphicsContext::ScreenIdentifier
Viewer::getDefaultScreenIdentifier()
{
osg::GraphicsContext::ScreenIdentifier screenIdentifier;
screenIdentifier.readDISPLAY();
if (screenIdentifier.displayNum < 0)
screenIdentifier.displayNum = 0;
if (screenIdentifier.screenNum < 0)
screenIdentifier.screenNum = 0;
return screenIdentifier;
}
osg::GraphicsContext::ScreenIdentifier
Viewer::getScreenIdentifier(const std::string& display)
{
osg::GraphicsContext::ScreenIdentifier screenIdentifier;
screenIdentifier.setScreenIdentifier(display);
osg::GraphicsContext::ScreenIdentifier defaultScreenIdentifier;
defaultScreenIdentifier = getDefaultScreenIdentifier();
if (screenIdentifier.hostName.empty())
screenIdentifier.hostName = defaultScreenIdentifier.hostName;
if (screenIdentifier.displayNum < 0)
screenIdentifier.displayNum = defaultScreenIdentifier.displayNum;
if (screenIdentifier.screenNum < 0)
screenIdentifier.screenNum = defaultScreenIdentifier.screenNum;
return screenIdentifier;
}
osg::GraphicsContext::ScreenSettings
Viewer::getScreenSettings(const osg::GraphicsContext::ScreenIdentifier& screenIdentifier)
{
osg::GraphicsContext::ScreenSettings screenSettings;
osg::GraphicsContext::WindowingSystemInterface* wsi;
wsi = osg::GraphicsContext::getWindowingSystemInterface();
if (!wsi) {
SG_LOG(SG_VIEW, SG_ALERT, "No windowing system interface defined!");
return screenSettings;
}
wsi->getScreenSettings(screenIdentifier, screenSettings);
return screenSettings;
}
osg::GraphicsContext::Traits*
Viewer::getTraits(const osg::GraphicsContext::ScreenIdentifier& screenIdentifier)
{
osg::DisplaySettings* ds = _displaySettings.get();
if (!ds)
ds = osg::DisplaySettings::instance().get();
osg::GraphicsContext::Traits* traits = new osg::GraphicsContext::Traits(ds);
traits->hostName = screenIdentifier.hostName;
traits->displayNum = screenIdentifier.displayNum;
traits->screenNum = screenIdentifier.screenNum;
// not seriously consider something different
traits->doubleBuffer = true;
osg::GraphicsContext::ScreenSettings screenSettings;
screenSettings = getScreenSettings(screenIdentifier);
traits->x = 0;
traits->y = 0;
traits->width = screenSettings.width;
traits->height = screenSettings.height;
return traits;
}
#ifdef __linux__
class Viewer::_ResetScreenSaverSwapCallback : public osg::GraphicsContext::SwapCallback {
public:
_ResetScreenSaverSwapCallback() :
_timeStamp(SGTimeStamp::fromSec(0))
{
}
virtual ~_ResetScreenSaverSwapCallback()
{
}
virtual void swapBuffersImplementation(osg::GraphicsContext* graphicsContext)
{
graphicsContext->swapBuffersImplementation();
// This callback must be attached to this type of graphics context
assert(dynamic_cast<osgViewer::GraphicsWindowX11*>(graphicsContext));
// Reset the screen saver every 10 seconds
SGTimeStamp timeStamp = SGTimeStamp::now();
if (timeStamp < _timeStamp)
return;
_timeStamp = timeStamp + SGTimeStamp::fromSec(10);
// Obviously runs in the draw thread. Thus, use the draw display.
XResetScreenSaver(static_cast<osgViewer::GraphicsWindowX11*>(graphicsContext)->getDisplay());
}
private:
SGTimeStamp _timeStamp;
};
#endif
osg::GraphicsContext*
Viewer::createGraphicsContext(osg::GraphicsContext::Traits* traits)
{
osg::GraphicsContext::WindowingSystemInterface* wsi;
wsi = osg::GraphicsContext::getWindowingSystemInterface();
if (!wsi) {
SG_LOG(SG_VIEW, SG_ALERT, "No windowing system interface defined!");
return 0;
}
osg::GraphicsContext* graphicsContext = wsi->createGraphicsContext(traits);
if (!graphicsContext) {
SG_LOG(SG_VIEW, SG_ALERT, "Unable to create window \"" << traits->windowName << "\"!");
return 0;
}
#ifdef __linux__
if (dynamic_cast<osgViewer::GraphicsWindowX11*>(graphicsContext))
graphicsContext->setSwapCallback(new _ResetScreenSaverSwapCallback);
#endif
return graphicsContext;
}
#ifdef FG_HAVE_HLA
const HLAViewerFederate*
Viewer::getViewerFederate() const
{
return _viewerFederate.get();
}
HLAViewerFederate*
Viewer::getViewerFederate()
{
return _viewerFederate.get();
}
void
Viewer::setViewerFederate(HLAViewerFederate* viewerFederate)
{
if (!viewerFederate) {
SG_LOG(SG_VIEW, SG_ALERT, "Viewer::setViewerFederate(): Setting the viewer federate to zero is not supported!");
return;
}
if (_viewerFederate.valid()) {
SG_LOG(SG_VIEW, SG_ALERT, "Viewer::setViewerFederate(): Setting the viewer federate twice is not supported!");
return;
}
_viewerFederate = viewerFederate;
_viewerFederate->attachToViewer(this);
}
#endif
} // namespace fgviewer
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