src/Main/CameraGroup.cxx

   1 // Copyright (C) 2008  Tim Moore
   2 // Copyright (C) 2011  Mathias Froehlich
   3 //
   4 // This program is free software; you can redistribute it and/or
   5 // modify it under the terms of the GNU General Public License as
   6 // published by the Free Software Foundation; either version 2 of the
   7 // License, or (at your option) any later version.
   8 //
   9 // This program is distributed in the hope that it will be useful, but
  10 // WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 // General Public License for more details.
  13 //
  14 // You should have received a copy of the GNU General Public License
  15 // along with this program; if not, write to the Free Software
  16 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17
  18 #ifdef HAVE_CONFIG_H
  19 #  include <config.h>
  20 #endif
  21
  22 #include "CameraGroup.hxx"
  23
  24 #include "fg_props.hxx"
  25 #include "globals.hxx"
  26 #include "renderer.hxx"
  27 #include "FGEventHandler.hxx"
  28 #include "WindowBuilder.hxx"
  29 #include "WindowSystemAdapter.hxx"
  30 #include <simgear/props/props.hxx>
  31 #include <simgear/structure/OSGUtils.hxx>
  32 #include <simgear/structure/OSGVersion.hxx>
  33 #include <simgear/scene/material/EffectCullVisitor.hxx>
  34 #include <simgear/scene/util/RenderConstants.hxx>
  35 #include <simgear/scene/tgdb/userdata.hxx>
  36
  37 #include <algorithm>
  38 #include <cstring>
  39 #include <string>
  40
  41 #include <osg/Camera>
  42 #include <osg/Geometry>
  43 #include <osg/GraphicsContext>
  44 #include <osg/io_utils>
  45 #include <osg/Math>
  46 #include <osg/Matrix>
  47 #include <osg/Notify>
  48 #include <osg/Program>
  49 #include <osg/Quat>
  50 #include <osg/TexMat>
  51 #include <osg/Vec3d>
  52 #include <osg/Viewport>
  53
  54 #include <osgUtil/IntersectionVisitor>
  55
  56 #include <osgViewer/GraphicsWindow>
  57 #include <osgViewer/Renderer>
  58
  59 static osg::Matrix
  60 invert(const osg::Matrix& matrix)
  61 {
  62     return osg::Matrix::inverse(matrix);
  63 }
  64
  65 /// Returns the zoom factor of the master camera.
  66 /// The reference fov is the historic 55 deg
  67 static double
  68 zoomFactor()
  69 {
  70     double fov = fgGetDouble("/sim/current-view/field-of-view", 55);
  71     if (fov < 1)
  72         fov = 1;
  73     return tan(55*0.5*SG_DEGREES_TO_RADIANS)/tan(fov*0.5*SG_DEGREES_TO_RADIANS);
  74 }
  75
  76 static osg::Vec2d
  77 preMult(const osg::Vec2d& v, const osg::Matrix& m)
  78 {
  79   osg::Vec3d tmp = m.preMult(osg::Vec3(v, 0));
  80   return osg::Vec2d(tmp[0], tmp[1]);
  81 }
  82
  83 static osg::Matrix
  84 relativeProjection(const osg::Matrix& P0, const osg::Matrix& R, const osg::Vec2d ref[2],
  85                    const osg::Matrix& pP, const osg::Matrix& pR, const osg::Vec2d pRef[2])
  86 {
  87   // Track the way from one projection space to the other:
  88   // We want
  89   //  P = T*S*P0
  90   // where P0 is the projection template sensible for the given window size,
  91   // T is a translation matrix and S a scale matrix.
  92   // We need to determine T and S so that the reference points in the parents
  93   // projection space match the two reference points in this cameras projection space.
  94
  95   // Starting from the parents camera projection space, we get into this cameras
  96   // projection space by the transform matrix:
  97   //  P*R*inv(pP*pR) = T*S*P0*R*inv(pP*pR)
  98   // So, at first compute that matrix without T*S and determine S and T from that
  99
 100   // Ok, now osg uses the inverse matrix multiplication order, thus:
 101   osg::Matrix PtoPwithoutTS = invert(pR*pP)*R*P0;
 102   // Compute the parents reference points in the current projection space
 103   // without the yet unknown T and S
 104   osg::Vec2d pRefInThis[2] = {
 105     preMult(pRef[0], PtoPwithoutTS),
 106     preMult(pRef[1], PtoPwithoutTS)
 107   };
 108
 109   // To get the same zoom, rescale to match the parents size
 110   double s = (ref[0] - ref[1]).length()/(pRefInThis[0] - pRefInThis[1]).length();
 111   osg::Matrix S = osg::Matrix::scale(s, s, 1);
 112
 113   // For the translation offset, incorporate the now known scale
 114   // and recompute the position ot the first reference point in the
 115   // currents projection space without the yet unknown T.
 116   pRefInThis[0] = preMult(pRef[0], PtoPwithoutTS*S);
 117   // The translation is then the difference of the reference points
 118   osg::Matrix T = osg::Matrix::translate(osg::Vec3d(ref[0] - pRefInThis[0], 0));
 119
 120   // Compose and return the desired final projection matrix
 121   return P0*S*T;
 122 }
 123
 124 namespace flightgear
 125 {
 126 using namespace osg;
 127
 128 using std::strcmp;
 129 using std::string;
 130
 131 ref_ptr<CameraGroup> CameraGroup::_defaultGroup;
 132
 133 CameraGroup::CameraGroup(osgViewer::Viewer* viewer) :
 134     _viewer(viewer)
 135 {
 136 }
 137
 138 }
 139
 140 namespace
 141 {
 142 using namespace osg;
 143
 144 // Given a projection matrix, return a new one with the same frustum
 145 // sides and new near / far values.
 146
 147 void makeNewProjMat(Matrixd& oldProj, double znear,
 148                                        double zfar, Matrixd& projection)
 149 {
 150     projection = oldProj;
 151     // Slightly inflate the near & far planes to avoid objects at the
 152     // extremes being clipped out.
 153     znear *= 0.999;
 154     zfar *= 1.001;
 155
 156     // Clamp the projection matrix z values to the range (near, far)
 157     double epsilon = 1.0e-6;
 158     if (fabs(projection(0,3)) < epsilon &&
 159         fabs(projection(1,3)) < epsilon &&
 160         fabs(projection(2,3)) < epsilon) {
 161         // Projection is Orthographic
 162         epsilon = -1.0/(zfar - znear); // Used as a temp variable
 163         projection(2,2) = 2.0*epsilon;
 164         projection(3,2) = (zfar + znear)*epsilon;
 165     } else {
 166         // Projection is Perspective
 167         double trans_near = (-znear*projection(2,2) + projection(3,2)) /
 168             (-znear*projection(2,3) + projection(3,3));
 169         double trans_far = (-zfar*projection(2,2) + projection(3,2)) /
 170             (-zfar*projection(2,3) + projection(3,3));
 171         double ratio = fabs(2.0/(trans_near - trans_far));
 172         double center = -0.5*(trans_near + trans_far);
 173
 174         projection.postMult(osg::Matrixd(1.0, 0.0, 0.0, 0.0,
 175                                          0.0, 1.0, 0.0, 0.0,
 176                                          0.0, 0.0, ratio, 0.0,
 177                                          0.0, 0.0, center*ratio, 1.0));
 178     }
 179 }
 180 }
 181
 182 namespace flightgear
 183 {
 184 void CameraInfo::updateCameras()
 185 {
 186     for (CameraMap::iterator ii = cameras.begin(); ii != cameras.end(); ++ii ) {
 187         float f = ii->second.scaleFactor;
 188         if ( f == 0.0f ) continue;
 189         ii->second.camera->getViewport()->setViewport(x*f, y*f, width*f, height*f);
 190     }
 191
 192     for (RenderBufferMap::iterator ii = buffers.begin(); ii != buffers.end(); ++ii ) {
 193         float f = ii->second.scaleFactor;
 194         if ( f == 0.0f ) continue;
 195         osg::Texture2D* texture = ii->second.texture.get();
 196         if ( texture->getTextureHeight() != height*f || texture->getTextureWidth() != width*f ) {
 197             texture->setTextureSize( width*f, height*f );
 198             texture->dirtyTextureObject();
 199         }
 200     }
 201 }
 202
 203 void CameraInfo::resized(double w, double h)
 204 {
 205     for (RenderBufferMap::iterator ii = buffers.begin(); ii != buffers.end(); ++ii) {
 206         float s = ii->second.scaleFactor;
 207         if ( s == 0.0f ) continue;
 208         ii->second.texture->setTextureSize( w * s, h * s );
 209         ii->second.texture->dirtyTextureObject();
 210     }
 211
 212     for (CameraMap::iterator ii = cameras.begin(); ii != cameras.end(); ++ii) {
 213         RenderStageInfo& rsi = ii->second;
 214         if (!rsi.resizable ||
 215                 rsi.camera->getRenderTargetImplementation() != osg::Camera::FRAME_BUFFER_OBJECT ||
 216                 rsi.scaleFactor == 0.0f )
 217             continue;
 218
 219         Viewport* vp = rsi.camera->getViewport();
 220         vp->width() = w * rsi.scaleFactor;
 221         vp->height() = h * rsi.scaleFactor;
 222
 223         osgViewer::Renderer* renderer
 224             = static_cast<osgViewer::Renderer*>(rsi.camera->getRenderer());
 225         for (int i = 0; i < 2; ++i) {
 226             osgUtil::SceneView* sceneView = renderer->getSceneView(i);
 227             sceneView->getRenderStage()->setFrameBufferObject(0);
 228             sceneView->getRenderStage()->setCameraRequiresSetUp(true);
 229             if (sceneView->getRenderStageLeft()) {
 230                 sceneView->getRenderStageLeft()->setFrameBufferObject(0);
 231                 sceneView->getRenderStageLeft()->setCameraRequiresSetUp(true);
 232             }
 233             if (sceneView->getRenderStageRight()) {
 234                 sceneView->getRenderStageRight()->setFrameBufferObject(0);
 235                 sceneView->getRenderStageRight()->setCameraRequiresSetUp(true);
 236             }
 237         }
 238     }
 239 }
 240
 241 osg::Camera* CameraInfo::getCamera(CameraKind k) const
 242 {
 243     CameraMap::const_iterator ii = cameras.find( k );
 244     if (ii == cameras.end())
 245         return 0;
 246     return ii->second.camera.get();
 247 }
 248
 249 osg::Texture2D* CameraInfo::getBuffer(RenderBufferInfo::Kind k) const
 250 {
 251     RenderBufferMap::const_iterator ii = buffers.find(k);
 252     if (ii == buffers.end())
 253         return 0;
 254     return ii->second.texture.get();
 255 }
 256
 257 int CameraInfo::getMainSlaveIndex() const
 258 {
 259     return cameras.find( MAIN_CAMERA )->second.slaveIndex;
 260 }
 261
 262 void CameraInfo::setMatrices(osg::Camera* c)
 263 {
 264     view->set( c->getViewMatrix() );
 265     viewInverse->set( osg::Matrix::inverse( c->getViewMatrix() ) );
 266     projInverse->set( osg::Matrix::inverse( c->getProjectionMatrix() ) );
 267 }
 268
 269 void CameraGroup::update(const osg::Vec3d& position,
 270                          const osg::Quat& orientation)
 271 {
 272     const Matrix masterView(osg::Matrix::translate(-position)
 273                             * osg::Matrix::rotate(orientation.inverse()));
 274     _viewer->getCamera()->setViewMatrix(masterView);
 275     const Matrix& masterProj = _viewer->getCamera()->getProjectionMatrix();
 276     double masterZoomFactor = zoomFactor();
 277     for (CameraList::iterator i = _cameras.begin(); i != _cameras.end(); ++i) {
 278         const CameraInfo* info = i->get();
 279
 280         Camera* camera = info->getCamera(MAIN_CAMERA);
 281         if ( camera ) {
 282             const View::Slave& slave = _viewer->getSlave(info->getMainSlaveIndex());
 283 #if SG_OSG_VERSION_LESS_THAN(3,0,0)
 284             // refreshes camera viewports (for now)
 285             info->updateCameras();
 286 #endif
 287             Matrix viewMatrix;
 288             if (info->flags & GUI) {
 289                 viewMatrix = osg::Matrix(); // identifty transform on the GUI camera
 290             } else if ((info->flags & VIEW_ABSOLUTE) != 0)
 291                 viewMatrix = slave._viewOffset;
 292             else
 293                 viewMatrix = masterView * slave._viewOffset;
 294             camera->setViewMatrix(viewMatrix);
 295             Matrix projectionMatrix;
 296             if (info->flags & GUI) {
 297                 projectionMatrix = osg::Matrix::ortho2D(0, info->width, 0, info->height);
 298             } else if ((info->flags & PROJECTION_ABSOLUTE) != 0) {
 299                 if (info->flags & ENABLE_MASTER_ZOOM) {
 300                     if (info->relativeCameraParent < _cameras.size()) {
 301                         // template projection matrix and view matrix of the current camera
 302                         osg::Matrix P0 = slave._projectionOffset;
 303                         osg::Matrix R = viewMatrix;
 304
 305                         // The already known projection and view matrix of the parent camera
 306                         const CameraInfo* parentInfo = _cameras[info->relativeCameraParent].get();
 307                         RenderStageInfo prsi = parentInfo->cameras.find(MAIN_CAMERA)->second;
 308                         osg::Matrix pP = prsi.camera->getProjectionMatrix();
 309                         osg::Matrix pR = prsi.camera->getViewMatrix();
 310
 311                         // And the projection matrix derived from P0 so that the reference points match
 312                         projectionMatrix = relativeProjection(P0, R, info->thisReference,
 313                                                               pP, pR, info->parentReference);
 314
 315                     } else {
 316                         // We want to zoom, so take the original matrix and apply the zoom to it.
 317                         projectionMatrix = slave._projectionOffset;
 318                         projectionMatrix.postMultScale(osg::Vec3d(masterZoomFactor, masterZoomFactor, 1));
 319                     }
 320                 } else {
 321                     projectionMatrix = slave._projectionOffset;
 322                 }
 323             } else {
 324                 projectionMatrix = masterProj * slave._projectionOffset;
 325             }
 326
 327             CameraMap::const_iterator ii = info->cameras.find(FAR_CAMERA);
 328             if (ii == info->cameras.end() || !ii->second.camera.valid()) {
 329                 camera->setProjectionMatrix(projectionMatrix);
 330             } else {
 331                 Camera* farCamera = ii->second.camera;
 332                 farCamera->setViewMatrix(viewMatrix);
 333                 double left, right, bottom, top, parentNear, parentFar;
 334                 projectionMatrix.getFrustum(left, right, bottom, top,
 335                                             parentNear, parentFar);
 336                 if ((info->flags & FIXED_NEAR_FAR) == 0) {
 337                     parentNear = _zNear;
 338                     parentFar = _zFar;
 339                 }
 340                 if (parentFar < _nearField || _nearField == 0.0f) {
 341                     camera->setProjectionMatrix(projectionMatrix);
 342                     camera->setCullMask(camera->getCullMask()
 343                                         | simgear::BACKGROUND_BIT);
 344                     camera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
 345                     farCamera->setNodeMask(0);
 346                 } else {
 347                     Matrix nearProj, farProj;
 348                     makeNewProjMat(projectionMatrix, parentNear, _nearField,
 349                                    nearProj);
 350                     makeNewProjMat(projectionMatrix, _nearField, parentFar,
 351                                    farProj);
 352                     camera->setProjectionMatrix(nearProj);
 353                     camera->setCullMask(camera->getCullMask()
 354                                         & ~simgear::BACKGROUND_BIT);
 355                     camera->setClearMask(GL_DEPTH_BUFFER_BIT);
 356                     farCamera->setProjectionMatrix(farProj);
 357                     farCamera->setNodeMask(camera->getNodeMask());
 358                 }
 359             }
 360         } else {
 361             bool viewDone = false;
 362             Matrix viewMatrix;
 363             bool projectionDone = false;
 364             Matrix projectionMatrix;
 365             for ( CameraMap::const_iterator ii = info->cameras.begin(); ii != info->cameras.end(); ++ii ) {
 366                 if ( ii->first == SHADOW_CAMERA ) {
 367                     globals->get_renderer()->updateShadowCamera(info, position);
 368                     continue;
 369                 }
 370                 if ( ii->second.fullscreen )
 371                     continue;
 372
 373                 Camera* camera = ii->second.camera.get();
 374                 int slaveIndex = ii->second.slaveIndex;
 375                 const View::Slave& slave = _viewer->getSlave(slaveIndex);
 376
 377                 if ( !viewDone ) {
 378                     if ((info->flags & VIEW_ABSOLUTE) != 0)
 379                         viewMatrix = slave._viewOffset;
 380                     else
 381                         viewMatrix = masterView * slave._viewOffset;
 382                     viewDone = true;
 383                 }
 384
 385                 camera->setViewMatrix( viewMatrix );
 386
 387                 if ( !projectionDone ) {
 388                     if ((info->flags & PROJECTION_ABSOLUTE) != 0) {
 389                         if (info->flags & ENABLE_MASTER_ZOOM) {
 390                             if (info->relativeCameraParent < _cameras.size()) {
 391                                 // template projection matrix and view matrix of the current camera
 392                                 osg::Matrix P0 = slave._projectionOffset;
 393                                 osg::Matrix R = viewMatrix;
 394
 395                                 // The already known projection and view matrix of the parent camera
 396                                 const CameraInfo* parentInfo = _cameras[info->relativeCameraParent].get();
 397                                 RenderStageInfo prsi = parentInfo->cameras.find(MAIN_CAMERA)->second;
 398                                 osg::Matrix pP = prsi.camera->getProjectionMatrix();
 399                                 osg::Matrix pR = prsi.camera->getViewMatrix();
 400
 401                                 // And the projection matrix derived from P0 so that the reference points match
 402                                 projectionMatrix = relativeProjection(P0, R, info->thisReference,
 403                                                                       pP, pR, info->parentReference);
 404
 405                             } else {
 406                                 // We want to zoom, so take the original matrix and apply the zoom to it.
 407                                 projectionMatrix = slave._projectionOffset;
 408                                 projectionMatrix.postMultScale(osg::Vec3d(masterZoomFactor, masterZoomFactor, 1));
 409                             }
 410                         } else {
 411                             projectionMatrix = slave._projectionOffset;
 412                         }
 413                     } else {
 414                         projectionMatrix = masterProj * slave._projectionOffset;
 415                     }
 416                     projectionDone = true;
 417                 }
 418
 419                 camera->setProjectionMatrix(projectionMatrix);
 420             }
 421         }
 422     }
 423
 424     globals->get_renderer()->setPlanes( _zNear, _zFar );
 425 }
 426
 427 void CameraGroup::setCameraParameters(float vfov, float aspectRatio)
 428 {
 429     if (vfov != 0.0f && aspectRatio != 0.0f)
 430         _viewer->getCamera()
 431             ->setProjectionMatrixAsPerspective(vfov,
 432                                                1.0f / aspectRatio,
 433                                                _zNear, _zFar);
 434 }
 435
 436 double CameraGroup::getMasterAspectRatio() const
 437 {
 438     if (_cameras.empty())
 439         return 0.0;
 440
 441     const CameraInfo* info = _cameras.front();
 442
 443     osg::Camera* camera = info->getCamera(MAIN_CAMERA);
 444     if ( !camera )
 445         camera = info->getCamera( GEOMETRY_CAMERA );
 446     const osg::Viewport* viewport = camera->getViewport();
 447     if (!viewport) {
 448         return 0.0;
 449     }
 450
 451     return static_cast<double>(viewport->height()) / viewport->width();
 452 }
 453
 454 }
 455
 456 namespace
 457 {
 458 // A raw value for property nodes that references a class member via
 459 // an osg::ref_ptr.
 460 template<class C, class T>
 461 class RefMember : public SGRawValue<T>
 462 {
 463 public:
 464     RefMember (C *obj, T C::*ptr)
 465         : _obj(obj), _ptr(ptr) {}
 466     virtual ~RefMember () {}
 467     virtual T getValue () const
 468     {
 469         return _obj.get()->*_ptr;
 470     }
 471     virtual bool setValue (T value)
 472     {
 473         _obj.get()->*_ptr = value;
 474         return true;
 475     }
 476     virtual SGRawValue<T> * clone () const
 477     {
 478         return new RefMember(_obj.get(), _ptr);
 479     }
 480 private:
 481     ref_ptr<C> _obj;
 482     T C::* const _ptr;
 483 };
 484
 485 template<typename C, typename T>
 486 RefMember<C, T> makeRefMember(C *obj, T C::*ptr)
 487 {
 488     return RefMember<C, T>(obj, ptr);
 489 }
 490
 491 template<typename C, typename T>
 492 void bindMemberToNode(SGPropertyNode* parent, const char* childName,
 493                       C* obj, T C::*ptr, T value)
 494 {
 495     SGPropertyNode* valNode = parent->getNode(childName);
 496     RefMember<C, T> refMember = makeRefMember(obj, ptr);
 497     if (!valNode) {
 498         valNode = parent->getNode(childName, true);
 499         valNode->tie(refMember, false);
 500         setValue(valNode, value);
 501     } else {
 502         valNode->tie(refMember, true);
 503     }
 504 }
 505
 506 void buildViewport(flightgear::CameraInfo* info, SGPropertyNode* viewportNode,
 507                    const osg::GraphicsContext::Traits *traits)
 508 {
 509     using namespace flightgear;
 510     bindMemberToNode(viewportNode, "x", info, &CameraInfo::x, 0.0);
 511     bindMemberToNode(viewportNode, "y", info, &CameraInfo::y, 0.0);
 512     bindMemberToNode(viewportNode, "width", info, &CameraInfo::width,
 513                      static_cast<double>(traits->width));
 514     bindMemberToNode(viewportNode, "height", info, &CameraInfo::height,
 515                      static_cast<double>(traits->height));
 516 }
 517 }
 518
 519 namespace flightgear
 520 {
 521
 522 // Mostly copied from osg's osgViewer/View.cpp
 523
 524 static osg::Geometry* createPanoramicSphericalDisplayDistortionMesh(
 525     const Vec3& origin, const Vec3& widthVector, const Vec3& heightVector,
 526     double sphere_radius, double collar_radius,
 527     Image* intensityMap = 0, const Matrix& projectorMatrix = Matrix())
 528 {
 529     osg::Vec3d center(0.0,0.0,0.0);
 530     osg::Vec3d eye(0.0,0.0,0.0);
 531
 532     double distance = sqrt(sphere_radius*sphere_radius - collar_radius*collar_radius);
 533     bool flip = false;
 534     bool texcoord_flip = false;
 535
 536 #if 0
 537     osg::Vec3d projector = eye - osg::Vec3d(0.0,0.0, distance);
 538
 539     OSG_INFO<<"createPanoramicSphericalDisplayDistortionMesh : Projector position = "<<projector<<std::endl;
 540     OSG_INFO<<"createPanoramicSphericalDisplayDistortionMesh : distance = "<<distance<<std::endl;
 541 #endif
 542     // create the quad to visualize.
 543     osg::Geometry* geometry = new osg::Geometry();
 544
 545     geometry->setSupportsDisplayList(false);
 546
 547     osg::Vec3 xAxis(widthVector);
 548     float width = widthVector.length();
 549     xAxis /= width;
 550
 551     osg::Vec3 yAxis(heightVector);
 552     float height = heightVector.length();
 553     yAxis /= height;
 554
 555     int noSteps = 160;
 556
 557     osg::Vec3Array* vertices = new osg::Vec3Array;
 558     osg::Vec2Array* texcoords0 = new osg::Vec2Array;
 559     osg::Vec2Array* texcoords1 = intensityMap==0 ? new osg::Vec2Array : 0;
 560     osg::Vec4Array* colors = new osg::Vec4Array;
 561
 562 #if 0
 563     osg::Vec3 bottom = origin;
 564     osg::Vec3 dx = xAxis*(width/((float)(noSteps-2)));
 565     osg::Vec3 dy = yAxis*(height/((float)(noSteps-1)));
 566 #endif
 567     osg::Vec3 top = origin + yAxis*height;
 568
 569     osg::Vec3 screenCenter = origin + widthVector*0.5f + heightVector*0.5f;
 570     float screenRadius = heightVector.length() * 0.5f;
 571
 572     geometry->getOrCreateStateSet()->setMode(GL_CULL_FACE, osg::StateAttribute::OFF | osg::StateAttribute::PROTECTED);
 573
 574     for(int i=0;i<noSteps;++i)
 575     {
 576         //osg::Vec3 cursor = bottom+dy*(float)i;
 577         for(int j=0;j<noSteps;++j)
 578         {
 579             osg::Vec2 texcoord(double(i)/double(noSteps-1), double(j)/double(noSteps-1));
 580             double theta = texcoord.x() * 2.0 * osg::PI;
 581             double phi = (1.0-texcoord.y()) * osg::PI;
 582
 583             if (texcoord_flip) texcoord.y() = 1.0f - texcoord.y();
 584
 585             osg::Vec3 pos(sin(phi)*sin(theta), sin(phi)*cos(theta), cos(phi));
 586             pos = pos*projectorMatrix;
 587
 588             double alpha = atan2(pos.x(), pos.y());
 589             if (alpha<0.0) alpha += 2.0*osg::PI;
 590
 591             double beta = atan2(sqrt(pos.x()*pos.x() + pos.y()*pos.y()), pos.z());
 592             if (beta<0.0) beta += 2.0*osg::PI;
 593
 594             double gamma = atan2(sqrt(double(pos.x()*pos.x() + pos.y()*pos.y())), double(pos.z()+distance));
 595             if (gamma<0.0) gamma += 2.0*osg::PI;
 596
 597
 598             osg::Vec3 v = screenCenter + osg::Vec3(sin(alpha)*gamma*2.0/osg::PI, -cos(alpha)*gamma*2.0/osg::PI, 0.0f)*screenRadius;
 599
 600             if (flip)
 601                 vertices->push_back(osg::Vec3(v.x(), top.y()-(v.y()-origin.y()),v.z()));
 602             else
 603                 vertices->push_back(v);
 604
 605             texcoords0->push_back( texcoord );
 606
 607             osg::Vec2 texcoord1(alpha/(2.0*osg::PI), 1.0f - beta/osg::PI);
 608             if (intensityMap)
 609             {
 610                 colors->push_back(intensityMap->getColor(texcoord1));
 611             }
 612             else
 613             {
 614                 colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
 615                 if (texcoords1) texcoords1->push_back( texcoord1 );
 616             }
 617
 618
 619         }
 620     }
 621
 622
 623     // pass the created vertex array to the points geometry object.
 624     geometry->setVertexArray(vertices);
 625
 626     geometry->setColorArray(colors);
 627     geometry->setColorBinding(osg::Geometry::BIND_PER_VERTEX);
 628
 629     geometry->setTexCoordArray(0,texcoords0);
 630     if (texcoords1) geometry->setTexCoordArray(1,texcoords1);
 631
 632     osg::DrawElementsUShort* elements = new osg::DrawElementsUShort(osg::PrimitiveSet::TRIANGLES);
 633     geometry->addPrimitiveSet(elements);
 634
 635     for(int i=0;i<noSteps-1;++i)
 636     {
 637         for(int j=0;j<noSteps-1;++j)
 638         {
 639             int i1 = j+(i+1)*noSteps;
 640             int i2 = j+(i)*noSteps;
 641             int i3 = j+1+(i)*noSteps;
 642             int i4 = j+1+(i+1)*noSteps;
 643
 644             osg::Vec3& v1 = (*vertices)[i1];
 645             osg::Vec3& v2 = (*vertices)[i2];
 646             osg::Vec3& v3 = (*vertices)[i3];
 647             osg::Vec3& v4 = (*vertices)[i4];
 648
 649             if ((v1-screenCenter).length()>screenRadius) continue;
 650             if ((v2-screenCenter).length()>screenRadius) continue;
 651             if ((v3-screenCenter).length()>screenRadius) continue;
 652             if ((v4-screenCenter).length()>screenRadius) continue;
 653
 654             elements->push_back(i1);
 655             elements->push_back(i2);
 656             elements->push_back(i3);
 657
 658             elements->push_back(i1);
 659             elements->push_back(i3);
 660             elements->push_back(i4);
 661         }
 662     }
 663
 664     return geometry;
 665 }
 666
 667 void CameraGroup::buildDistortionCamera(const SGPropertyNode* psNode,
 668                                         Camera* camera)
 669 {
 670     const SGPropertyNode* texNode = psNode->getNode("texture");
 671     if (!texNode) {
 672         // error
 673         return;
 674     }
 675     string texName = texNode->getStringValue();
 676     TextureMap::iterator itr = _textureTargets.find(texName);
 677     if (itr == _textureTargets.end()) {
 678         // error
 679         return;
 680     }
 681     Viewport* viewport = camera->getViewport();
 682     float width = viewport->width();
 683     float height = viewport->height();
 684     TextureRectangle* texRect = itr->second.get();
 685     double radius = psNode->getDoubleValue("radius", 1.0);
 686     double collar = psNode->getDoubleValue("collar", 0.45);
 687     Geode* geode = new Geode();
 688     geode->addDrawable(createPanoramicSphericalDisplayDistortionMesh(
 689                            Vec3(0.0f,0.0f,0.0f), Vec3(width,0.0f,0.0f),
 690                            Vec3(0.0f,height,0.0f), radius, collar));
 691
 692     // new we need to add the texture to the mesh, we do so by creating a
 693     // StateSet to contain the Texture StateAttribute.
 694     StateSet* stateset = geode->getOrCreateStateSet();
 695     stateset->setTextureAttributeAndModes(0, texRect, StateAttribute::ON);
 696     stateset->setMode(GL_LIGHTING, StateAttribute::OFF);
 697
 698     TexMat* texmat = new TexMat;
 699     texmat->setScaleByTextureRectangleSize(true);
 700     stateset->setTextureAttributeAndModes(0, texmat, osg::StateAttribute::ON);
 701 #if 0
 702     if (!applyIntensityMapAsColours && intensityMap)
 703     {
 704         stateset->setTextureAttributeAndModes(1, new osg::Texture2D(intensityMap), osg::StateAttribute::ON);
 705     }
 706 #endif
 707     // add subgraph to render
 708     camera->addChild(geode);
 709     camera->setClearMask(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
 710     camera->setClearColor(osg::Vec4(0.0, 0.0, 0.0, 1.0));
 711     camera->setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR);
 712     camera->setCullingMode(osg::CullSettings::NO_CULLING);
 713     camera->setName("DistortionCorrectionCamera");
 714 }
 715
 716 CameraInfo* CameraGroup::buildCamera(SGPropertyNode* cameraNode)
 717 {
 718     WindowBuilder *wBuild = WindowBuilder::getWindowBuilder();
 719     const SGPropertyNode* windowNode = cameraNode->getNode("window");
 720     GraphicsWindow* window = 0;
 721     int cameraFlags = DO_INTERSECTION_TEST;
 722     if (windowNode) {
 723         // New style window declaration / definition
 724         window = wBuild->buildWindow(windowNode);
 725     } else {
 726         // Old style: suck window params out of camera block
 727         window = wBuild->buildWindow(cameraNode);
 728     }
 729     if (!window) {
 730         return 0;
 731     }
 732     Camera* camera = new Camera;
 733     camera->setAllowEventFocus(false);
 734     camera->setGraphicsContext(window->gc.get());
 735     camera->setViewport(new Viewport);
 736     camera->setCullingMode(CullSettings::SMALL_FEATURE_CULLING
 737                            | CullSettings::VIEW_FRUSTUM_CULLING);
 738     camera->setInheritanceMask(CullSettings::ALL_VARIABLES
 739                                & ~(CullSettings::CULL_MASK
 740                                    | CullSettings::CULLING_MODE
 741 #if defined(HAVE_CULLSETTINGS_CLEAR_MASK)
 742                                    | CullSettings::CLEAR_MASK
 743 #endif
 744                                    ));
 745
 746     osg::Matrix vOff;
 747     const SGPropertyNode* viewNode = cameraNode->getNode("view");
 748     if (viewNode) {
 749         double heading = viewNode->getDoubleValue("heading-deg", 0.0);
 750         double pitch = viewNode->getDoubleValue("pitch-deg", 0.0);
 751         double roll = viewNode->getDoubleValue("roll-deg", 0.0);
 752         double x = viewNode->getDoubleValue("x", 0.0);
 753         double y = viewNode->getDoubleValue("y", 0.0);
 754         double z = viewNode->getDoubleValue("z", 0.0);
 755         // Build a view matrix, which is the inverse of a model
 756         // orientation matrix.
 757         vOff = (Matrix::translate(-x, -y, -z)
 758                 * Matrix::rotate(-DegreesToRadians(heading),
 759                                  Vec3d(0.0, 1.0, 0.0),
 760                                  -DegreesToRadians(pitch),
 761                                  Vec3d(1.0, 0.0, 0.0),
 762                                  -DegreesToRadians(roll),
 763                                  Vec3d(0.0, 0.0, 1.0)));
 764         if (viewNode->getBoolValue("absolute", false))
 765             cameraFlags |= VIEW_ABSOLUTE;
 766     } else {
 767         // Old heading parameter, works in the opposite direction
 768         double heading = cameraNode->getDoubleValue("heading-deg", 0.0);
 769         vOff.makeRotate(DegreesToRadians(heading), osg::Vec3(0, 1, 0));
 770     }
 771     // Configuring the physical dimensions of a monitor
 772     SGPropertyNode* viewportNode = cameraNode->getNode("viewport", true);
 773     double physicalWidth = viewportNode->getDoubleValue("width", 1024);
 774     double physicalHeight = viewportNode->getDoubleValue("height", 768);
 775     double bezelHeightTop = 0;
 776     double bezelHeightBottom = 0;
 777     double bezelWidthLeft = 0;
 778     double bezelWidthRight = 0;
 779     const SGPropertyNode* physicalDimensionsNode = 0;
 780     if ((physicalDimensionsNode = cameraNode->getNode("physical-dimensions")) != 0) {
 781         physicalWidth = physicalDimensionsNode->getDoubleValue("width", physicalWidth);
 782         physicalHeight = physicalDimensionsNode->getDoubleValue("height", physicalHeight);
 783         const SGPropertyNode* bezelNode = 0;
 784         if ((bezelNode = physicalDimensionsNode->getNode("bezel")) != 0) {
 785             bezelHeightTop = bezelNode->getDoubleValue("top", bezelHeightTop);
 786             bezelHeightBottom = bezelNode->getDoubleValue("bottom", bezelHeightBottom);
 787             bezelWidthLeft = bezelNode->getDoubleValue("left", bezelWidthLeft);
 788             bezelWidthRight = bezelNode->getDoubleValue("right", bezelWidthRight);
 789         }
 790     }
 791     osg::Matrix pOff;
 792     unsigned parentCameraIndex = ~0u;
 793     osg::Vec2d parentReference[2];
 794     osg::Vec2d thisReference[2];
 795     SGPropertyNode* projectionNode = 0;
 796     if ((projectionNode = cameraNode->getNode("perspective")) != 0) {
 797         double fovy = projectionNode->getDoubleValue("fovy-deg", 55.0);
 798         double aspectRatio = projectionNode->getDoubleValue("aspect-ratio",
 799                                                             1.0);
 800         double zNear = projectionNode->getDoubleValue("near", 0.0);
 801         double zFar = projectionNode->getDoubleValue("far", zNear + 20000);
 802         double offsetX = projectionNode->getDoubleValue("offset-x", 0.0);
 803         double offsetY = projectionNode->getDoubleValue("offset-y", 0.0);
 804         double tan_fovy = tan(DegreesToRadians(fovy*0.5));
 805         double right = tan_fovy * aspectRatio * zNear + offsetX;
 806         double left = -tan_fovy * aspectRatio * zNear + offsetX;
 807         double top = tan_fovy * zNear + offsetY;
 808         double bottom = -tan_fovy * zNear + offsetY;
 809         pOff.makeFrustum(left, right, bottom, top, zNear, zFar);
 810         cameraFlags |= PROJECTION_ABSOLUTE;
 811         if (projectionNode->getBoolValue("fixed-near-far", true))
 812             cameraFlags |= FIXED_NEAR_FAR;
 813     } else if ((projectionNode = cameraNode->getNode("frustum")) != 0
 814                || (projectionNode = cameraNode->getNode("ortho")) != 0) {
 815         double top = projectionNode->getDoubleValue("top", 0.0);
 816         double bottom = projectionNode->getDoubleValue("bottom", 0.0);
 817         double left = projectionNode->getDoubleValue("left", 0.0);
 818         double right = projectionNode->getDoubleValue("right", 0.0);
 819         double zNear = projectionNode->getDoubleValue("near", 0.0);
 820         double zFar = projectionNode->getDoubleValue("far", zNear + 20000);
 821         if (cameraNode->getNode("frustum")) {
 822             pOff.makeFrustum(left, right, bottom, top, zNear, zFar);
 823             cameraFlags |= PROJECTION_ABSOLUTE;
 824         } else {
 825             pOff.makeOrtho(left, right, bottom, top, zNear, zFar);
 826             cameraFlags |= (PROJECTION_ABSOLUTE | ORTHO);
 827         }
 828         if (projectionNode->getBoolValue("fixed-near-far", true))
 829             cameraFlags |= FIXED_NEAR_FAR;
 830     } else if ((projectionNode = cameraNode->getNode("master-perspective")) != 0) {
 831         double zNear = projectionNode->getDoubleValue("eye-distance", 0.4*physicalWidth);
 832         double xoff = projectionNode->getDoubleValue("x-offset", 0);
 833         double yoff = projectionNode->getDoubleValue("y-offset", 0);
 834         double left = -0.5*physicalWidth - xoff;
 835         double right = 0.5*physicalWidth - xoff;
 836         double bottom = -0.5*physicalHeight - yoff;
 837         double top = 0.5*physicalHeight - yoff;
 838         pOff.makeFrustum(left, right, bottom, top, zNear, zNear*1000);
 839         cameraFlags |= PROJECTION_ABSOLUTE | ENABLE_MASTER_ZOOM;
 840     } else if ((projectionNode = cameraNode->getNode("right-of-perspective"))
 841                || (projectionNode = cameraNode->getNode("left-of-perspective"))
 842                || (projectionNode = cameraNode->getNode("above-perspective"))
 843                || (projectionNode = cameraNode->getNode("below-perspective"))
 844                || (projectionNode = cameraNode->getNode("reference-points-perspective"))) {
 845         std::string name = projectionNode->getStringValue("parent-camera");
 846         for (unsigned i = 0; i < _cameras.size(); ++i) {
 847             if (_cameras[i]->name != name)
 848                 continue;
 849             parentCameraIndex = i;
 850         }
 851         if (_cameras.size() <= parentCameraIndex) {
 852             SG_LOG(SG_VIEW, SG_ALERT, "CameraGroup::buildCamera: "
 853                    "failed to find parent camera for relative camera!");
 854             return 0;
 855         }
 856         const CameraInfo* parentInfo = _cameras[parentCameraIndex].get();
 857         if (projectionNode->getNameString() == "right-of-perspective") {
 858             double tmp = (parentInfo->physicalWidth + 2*parentInfo->bezelWidthRight)/parentInfo->physicalWidth;
 859             parentReference[0] = osg::Vec2d(tmp, -1);
 860             parentReference[1] = osg::Vec2d(tmp, 1);
 861             tmp = (physicalWidth + 2*bezelWidthLeft)/physicalWidth;
 862             thisReference[0] = osg::Vec2d(-tmp, -1);
 863             thisReference[1] = osg::Vec2d(-tmp, 1);
 864         } else if (projectionNode->getNameString() == "left-of-perspective") {
 865             double tmp = (parentInfo->physicalWidth + 2*parentInfo->bezelWidthLeft)/parentInfo->physicalWidth;
 866             parentReference[0] = osg::Vec2d(-tmp, -1);
 867             parentReference[1] = osg::Vec2d(-tmp, 1);
 868             tmp = (physicalWidth + 2*bezelWidthRight)/physicalWidth;
 869             thisReference[0] = osg::Vec2d(tmp, -1);
 870             thisReference[1] = osg::Vec2d(tmp, 1);
 871         } else if (projectionNode->getNameString() == "above-perspective") {
 872             double tmp = (parentInfo->physicalHeight + 2*parentInfo->bezelHeightTop)/parentInfo->physicalHeight;
 873             parentReference[0] = osg::Vec2d(-1, tmp);
 874             parentReference[1] = osg::Vec2d(1, tmp);
 875             tmp = (physicalHeight + 2*bezelHeightBottom)/physicalHeight;
 876             thisReference[0] = osg::Vec2d(-1, -tmp);
 877             thisReference[1] = osg::Vec2d(1, -tmp);
 878         } else if (projectionNode->getNameString() == "below-perspective") {
 879             double tmp = (parentInfo->physicalHeight + 2*parentInfo->bezelHeightBottom)/parentInfo->physicalHeight;
 880             parentReference[0] = osg::Vec2d(-1, -tmp);
 881             parentReference[1] = osg::Vec2d(1, -tmp);
 882             tmp = (physicalHeight + 2*bezelHeightTop)/physicalHeight;
 883             thisReference[0] = osg::Vec2d(-1, tmp);
 884             thisReference[1] = osg::Vec2d(1, tmp);
 885         } else if (projectionNode->getNameString() == "reference-points-perspective") {
 886             SGPropertyNode* parentNode = projectionNode->getNode("parent", true);
 887             SGPropertyNode* thisNode = projectionNode->getNode("this", true);
 888             SGPropertyNode* pointNode;
 889
 890             pointNode = parentNode->getNode("point", 0, true);
 891             parentReference[0][0] = pointNode->getDoubleValue("x", 0)*2/parentInfo->physicalWidth;
 892             parentReference[0][1] = pointNode->getDoubleValue("y", 0)*2/parentInfo->physicalHeight;
 893             pointNode = parentNode->getNode("point", 1, true);
 894             parentReference[1][0] = pointNode->getDoubleValue("x", 0)*2/parentInfo->physicalWidth;
 895             parentReference[1][1] = pointNode->getDoubleValue("y", 0)*2/parentInfo->physicalHeight;
 896
 897             pointNode = thisNode->getNode("point", 0, true);
 898             thisReference[0][0] = pointNode->getDoubleValue("x", 0)*2/physicalWidth;
 899             thisReference[0][1] = pointNode->getDoubleValue("y", 0)*2/physicalHeight;
 900             pointNode = thisNode->getNode("point", 1, true);
 901             thisReference[1][0] = pointNode->getDoubleValue("x", 0)*2/physicalWidth;
 902             thisReference[1][1] = pointNode->getDoubleValue("y", 0)*2/physicalHeight;
 903         }
 904
 905         pOff = osg::Matrix::perspective(45, physicalWidth/physicalHeight, 1, 20000);
 906         cameraFlags |= PROJECTION_ABSOLUTE | ENABLE_MASTER_ZOOM;
 907     } else {
 908         // old style shear parameters
 909         double shearx = cameraNode->getDoubleValue("shear-x", 0);
 910         double sheary = cameraNode->getDoubleValue("shear-y", 0);
 911         pOff.makeTranslate(-shearx, -sheary, 0);
 912     }
 913     const SGPropertyNode* textureNode = cameraNode->getNode("texture");
 914     if (textureNode) {
 915         string texName = textureNode->getStringValue("name");
 916         int tex_width = textureNode->getIntValue("width");
 917         int tex_height = textureNode->getIntValue("height");
 918         TextureRectangle* texture = new TextureRectangle;
 919
 920         texture->setTextureSize(tex_width, tex_height);
 921         texture->setInternalFormat(GL_RGB);
 922         texture->setFilter(Texture::MIN_FILTER, Texture::LINEAR);
 923         texture->setFilter(Texture::MAG_FILTER, Texture::LINEAR);
 924         texture->setWrap(Texture::WRAP_S, Texture::CLAMP_TO_EDGE);
 925         texture->setWrap(Texture::WRAP_T, Texture::CLAMP_TO_EDGE);
 926         camera->setDrawBuffer(GL_FRONT);
 927         camera->setReadBuffer(GL_FRONT);
 928         camera->setRenderTargetImplementation(Camera::FRAME_BUFFER_OBJECT);
 929         camera->attach(Camera::COLOR_BUFFER, texture);
 930         _textureTargets[texName] = texture;
 931     } else {
 932         camera->setDrawBuffer(GL_BACK);
 933         camera->setReadBuffer(GL_BACK);
 934     }
 935     const SGPropertyNode* psNode = cameraNode->getNode("panoramic-spherical");
 936     bool useMasterSceneGraph = !psNode;
 937     CameraInfo* info = globals->get_renderer()->buildRenderingPipeline(this, cameraFlags, camera, vOff, pOff,
 938                                                                         window->gc.get(), useMasterSceneGraph);
 939     info->name = cameraNode->getStringValue("name");
 940     info->physicalWidth = physicalWidth;
 941     info->physicalHeight = physicalHeight;
 942     info->bezelHeightTop = bezelHeightTop;
 943     info->bezelHeightBottom = bezelHeightBottom;
 944     info->bezelWidthLeft = bezelWidthLeft;
 945     info->bezelWidthRight = bezelWidthRight;
 946     info->relativeCameraParent = parentCameraIndex;
 947     info->parentReference[0] = parentReference[0];
 948     info->parentReference[1] = parentReference[1];
 949     info->thisReference[0] = thisReference[0];
 950     info->thisReference[1] = thisReference[1];
 951     // If a viewport isn't set on the camera, then it's hard to dig it
 952     // out of the SceneView objects in the viewer, and the coordinates
 953     // of mouse events are somewhat bizzare.
 954     buildViewport(info, viewportNode, window->gc->getTraits());
 955     info->updateCameras();
 956     // Distortion camera needs the viewport which is created by addCamera().
 957     if (psNode) {
 958         info->flags = info->flags | VIEW_ABSOLUTE;
 959         buildDistortionCamera(psNode, camera);
 960     }
 961     return info;
 962 }
 963
 964 CameraInfo* CameraGroup::buildGUICamera(SGPropertyNode* cameraNode,
 965                                         GraphicsWindow* window)
 966 {
 967     WindowBuilder *wBuild = WindowBuilder::getWindowBuilder();
 968     const SGPropertyNode* windowNode = (cameraNode
 969                                         ? cameraNode->getNode("window")
 970                                         : 0);
 971     if (!window && windowNode) {
 972       // New style window declaration / definition
 973       window = wBuild->buildWindow(windowNode);
 974     }
 975
 976     if (!window) { // buildWindow can fail
 977       SG_LOG(SG_VIEW, SG_WARN, "CameraGroup::buildGUICamera: failed to build a window");
 978       return NULL;
 979     }
 980
 981     Camera* camera = new Camera;
 982     camera->setName( "GUICamera" );
 983     camera->setAllowEventFocus(false);
 984     camera->setGraphicsContext(window->gc.get());
 985     camera->setViewport(new Viewport);
 986     camera->setClearMask(0);
 987     camera->setInheritanceMask(CullSettings::ALL_VARIABLES
 988                                & ~(CullSettings::COMPUTE_NEAR_FAR_MODE
 989                                    | CullSettings::CULLING_MODE
 990 #if defined(HAVE_CULLSETTINGS_CLEAR_MASK)
 991                                    | CullSettings::CLEAR_MASK
 992 #endif
 993                                    ));
 994     camera->setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR);
 995     camera->setCullingMode(osg::CullSettings::NO_CULLING);
 996     camera->setProjectionResizePolicy(Camera::FIXED);
 997     camera->setReferenceFrame(Transform::ABSOLUTE_RF);
 998     const int cameraFlags = GUI | DO_INTERSECTION_TEST;
 999
1000     CameraInfo* result = new CameraInfo(cameraFlags);
1001     // The camera group will always update the camera
1002     camera->setReferenceFrame(Transform::ABSOLUTE_RF);
1003
1004     getViewer()->addSlave(camera, Matrixd::identity(), Matrixd::identity(), false);
1005     //installCullVisitor(camera);
1006     int slaveIndex = getViewer()->getNumSlaves() - 1;
1007     result->addCamera( MAIN_CAMERA, camera, slaveIndex );
1008     camera->setRenderOrder(Camera::POST_RENDER, slaveIndex);
1009     addCamera(result);
1010
1011     // XXX Camera needs to be drawn last; eventually the render order
1012     // should be assigned by a camera manager.
1013     camera->setRenderOrder(osg::Camera::POST_RENDER, 10000);
1014     SGPropertyNode* viewportNode = cameraNode->getNode("viewport", true);
1015     buildViewport(result, viewportNode, window->gc->getTraits());
1016
1017     // Disable statistics for the GUI camera.
1018     camera->setStats(0);
1019     result->updateCameras();
1020     return result;
1021 }
1022
1023 CameraGroup* CameraGroup::buildCameraGroup(osgViewer::Viewer* viewer,
1024                                            SGPropertyNode* gnode)
1025 {
1026     sgUserDataInit( globals->get_props() );
1027
1028     CameraGroup* cgroup = new CameraGroup(viewer);
1029     for (int i = 0; i < gnode->nChildren(); ++i) {
1030         SGPropertyNode* pNode = gnode->getChild(i);
1031         const char* name = pNode->getName();
1032         if (!strcmp(name, "camera")) {
1033             cgroup->buildCamera(pNode);
1034         } else if (!strcmp(name, "window")) {
1035             WindowBuilder::getWindowBuilder()->buildWindow(pNode);
1036         } else if (!strcmp(name, "gui")) {
1037             cgroup->buildGUICamera(pNode);
1038         }
1039     }
1040     bindMemberToNode(gnode, "znear", cgroup, &CameraGroup::_zNear, .1f);
1041     bindMemberToNode(gnode, "zfar", cgroup, &CameraGroup::_zFar, 120000.0f);
1042     bindMemberToNode(gnode, "near-field", cgroup, &CameraGroup::_nearField,
1043                      100.0f);
1044     return cgroup;
1045 }
1046
1047 void CameraGroup::setCameraCullMasks(Node::NodeMask nm)
1048 {
1049     for (CameraIterator i = camerasBegin(), e = camerasEnd(); i != e; ++i) {
1050         CameraInfo* info = i->get();
1051         if (info->flags & GUI)
1052             continue;
1053         osg::ref_ptr<osg::Camera> farCamera = info->getCamera(FAR_CAMERA);
1054         osg::Camera* camera = info->getCamera( MAIN_CAMERA );
1055         if ( camera == 0 )
1056             camera = info->getCamera( GEOMETRY_CAMERA );
1057         if (farCamera.valid() && farCamera->getNodeMask() != 0) {
1058             camera->setCullMask(nm & ~simgear::BACKGROUND_BIT);
1059             camera->setCullMaskLeft(nm & ~simgear::BACKGROUND_BIT);
1060             camera->setCullMaskRight(nm & ~simgear::BACKGROUND_BIT);
1061             farCamera->setCullMask(nm);
1062             farCamera->setCullMaskLeft(nm);
1063             farCamera->setCullMaskRight(nm);
1064         } else {
1065             camera->setCullMask(nm);
1066             camera->setCullMaskLeft(nm);
1067             camera->setCullMaskRight(nm);
1068         }
1069     }
1070 }
1071
1072 void CameraGroup::resized()
1073 {
1074     for (CameraIterator i = camerasBegin(), e = camerasEnd(); i != e; ++i) {
1075         CameraInfo *info = i->get();
1076         Camera* camera = info->getCamera( MAIN_CAMERA );
1077         if ( camera == 0 )
1078             camera = info->getCamera( DISPLAY_CAMERA );
1079         const Viewport* viewport = camera->getViewport();
1080         info->x = viewport->x();
1081         info->y = viewport->y();
1082         info->width = viewport->width();
1083         info->height = viewport->height();
1084
1085         info->resized( info->width, info->height );
1086     }
1087 }
1088
1089 const CameraInfo* CameraGroup::getGUICamera() const
1090 {
1091     ConstCameraIterator result
1092         = std::find_if(camerasBegin(), camerasEnd(),
1093                    FlagTester<CameraInfo>(GUI));
1094     if (result == camerasEnd()) {
1095         return NULL;
1096     }
1097
1098     return *result;
1099 }
1100
1101 Camera* getGUICamera(CameraGroup* cgroup)
1102 {
1103     const CameraInfo* info = cgroup->getGUICamera();
1104     if (!info) {
1105         return NULL;
1106     }
1107
1108     return info->getCamera(MAIN_CAMERA);
1109 }
1110
1111 static bool computeCameraIntersection(const CameraInfo* cinfo,
1112                                       const osgGA::GUIEventAdapter* ea,
1113                                       osgUtil::LineSegmentIntersector::Intersections& intersections)
1114 {
1115   using osgUtil::Intersector;
1116   using osgUtil::LineSegmentIntersector;
1117   double x, y;
1118   eventToWindowCoords(ea, x, y);
1119
1120   if (!(cinfo->flags & CameraGroup::DO_INTERSECTION_TEST))
1121     return false;
1122
1123   const Camera* camera = cinfo->getCamera(MAIN_CAMERA);
1124   if ( !camera )
1125     camera = cinfo->getCamera( GEOMETRY_CAMERA );
1126   if (camera->getGraphicsContext() != ea->getGraphicsContext())
1127     return false;
1128
1129   const Viewport* viewport = camera->getViewport();
1130   double epsilon = 0.5;
1131   if (!(x >= viewport->x() - epsilon
1132         && x < viewport->x() + viewport->width() -1.0 + epsilon
1133         && y >= viewport->y() - epsilon
1134         && y < viewport->y() + viewport->height() -1.0 + epsilon))
1135     return false;
1136
1137   Vec4d start(x, y, 0.0, 1.0);
1138   Vec4d end(x, y, 1.0, 1.0);
1139   Matrix windowMat = viewport->computeWindowMatrix();
1140   Matrix startPtMat = Matrix::inverse(camera->getProjectionMatrix()
1141                                       * windowMat);
1142   Matrix endPtMat;
1143   const Camera* farCamera = cinfo->getCamera( FAR_CAMERA );
1144   if (!farCamera || farCamera->getNodeMask() == 0)
1145     endPtMat = startPtMat;
1146   else
1147     endPtMat = Matrix::inverse(farCamera->getProjectionMatrix()
1148                                * windowMat);
1149   start = start * startPtMat;
1150   start /= start.w();
1151   end = end * endPtMat;
1152   end /= end.w();
1153   ref_ptr<LineSegmentIntersector> picker
1154   = new LineSegmentIntersector(Intersector::VIEW,
1155                                Vec3d(start.x(), start.y(), start.z()),
1156                                Vec3d(end.x(), end.y(), end.z()));
1157   osgUtil::IntersectionVisitor iv(picker.get());
1158   const_cast<Camera*>(camera)->accept(iv);
1159   if (picker->containsIntersections()) {
1160     intersections = picker->getIntersections();
1161     return true;
1162   }
1163
1164   return false;
1165 }
1166
1167 bool computeIntersections(const CameraGroup* cgroup,
1168                           const osgGA::GUIEventAdapter* ea,
1169                           osgUtil::LineSegmentIntersector::Intersections& intersections)
1170 {
1171     // test the GUI first
1172     const CameraInfo* guiCamera = cgroup->getGUICamera();
1173     if (guiCamera && computeCameraIntersection(guiCamera, ea, intersections))
1174         return true;
1175
1176     // Find camera that contains event
1177     for (CameraGroup::ConstCameraIterator iter = cgroup->camerasBegin(),
1178              e = cgroup->camerasEnd();
1179          iter != e;
1180          ++iter) {
1181         const CameraInfo* cinfo = iter->get();
1182         if (cinfo == guiCamera)
1183             continue;
1184
1185         if (computeCameraIntersection(cinfo, ea, intersections))
1186             return true;
1187     }
1188
1189     intersections.clear();
1190     return false;
1191 }
1192
1193 void warpGUIPointer(CameraGroup* cgroup, int x, int y)
1194 {
1195     using osgViewer::GraphicsWindow;
1196     Camera* guiCamera = getGUICamera(cgroup);
1197     if (!guiCamera)
1198         return;
1199     Viewport* vport = guiCamera->getViewport();
1200     GraphicsWindow* gw
1201         = dynamic_cast<GraphicsWindow*>(guiCamera->getGraphicsContext());
1202     if (!gw)
1203         return;
1204     globals->get_renderer()->getEventHandler()->setMouseWarped();
1205     // Translate the warp request into the viewport of the GUI camera,
1206     // send the request to the window, then transform the coordinates
1207     // for the Viewer's event queue.
1208     double wx = x + vport->x();
1209     double wyUp = vport->height() + vport->y() - y;
1210     double wy;
1211     const GraphicsContext::Traits* traits = gw->getTraits();
1212     if (gw->getEventQueue()->getCurrentEventState()->getMouseYOrientation()
1213         == osgGA::GUIEventAdapter::Y_INCREASING_DOWNWARDS) {
1214         wy = traits->height - wyUp;
1215     } else {
1216         wy = wyUp;
1217     }
1218     gw->getEventQueue()->mouseWarped(wx, wy);
1219     gw->requestWarpPointer(wx, wy);
1220     osgGA::GUIEventAdapter* eventState
1221         = cgroup->getViewer()->getEventQueue()->getCurrentEventState();
1222     double viewerX
1223         = (eventState->getXmin()
1224            + ((wx / double(traits->width))
1225               * (eventState->getXmax() - eventState->getXmin())));
1226     double viewerY
1227         = (eventState->getYmin()
1228            + ((wyUp / double(traits->height))
1229               * (eventState->getYmax() - eventState->getYmin())));
1230     cgroup->getViewer()->getEventQueue()->mouseWarped(viewerX, viewerY);
1231 }
1232 }