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 int CameraInfo::getMainSlaveIndex() const
 250 {
 251     return cameras.find( MAIN_CAMERA )->second.slaveIndex;
 252 }
 253
 254 void CameraInfo::setMatrices(osg::Camera* c)
 255 {
 256     view->set( c->getViewMatrix() );
 257     viewInverse->set( osg::Matrix::inverse( c->getViewMatrix() ) );
 258     projInverse->set( osg::Matrix::inverse( c->getProjectionMatrix() ) );
 259 }
 260
 261 void CameraGroup::update(const osg::Vec3d& position,
 262                          const osg::Quat& orientation)
 263 {
 264     const Matrix masterView(osg::Matrix::translate(-position)
 265                             * osg::Matrix::rotate(orientation.inverse()));
 266     _viewer->getCamera()->setViewMatrix(masterView);
 267     const Matrix& masterProj = _viewer->getCamera()->getProjectionMatrix();
 268     double masterZoomFactor = zoomFactor();
 269     for (CameraList::iterator i = _cameras.begin(); i != _cameras.end(); ++i) {
 270         const CameraInfo* info = i->get();
 271
 272         Camera* camera = info->getCamera(MAIN_CAMERA);
 273         if ( camera ) {
 274             const View::Slave& slave = _viewer->getSlave(info->getMainSlaveIndex());
 275 #if SG_OSG_VERSION_LESS_THAN(3,0,0)
 276             // refreshes camera viewports (for now)
 277             info->updateCameras();
 278 #endif
 279             Matrix viewMatrix;
 280             if (info->flags & GUI) {
 281                 viewMatrix = osg::Matrix(); // identifty transform on the GUI camera
 282             } else if ((info->flags & VIEW_ABSOLUTE) != 0)
 283                 viewMatrix = slave._viewOffset;
 284             else
 285                 viewMatrix = masterView * slave._viewOffset;
 286             camera->setViewMatrix(viewMatrix);
 287             Matrix projectionMatrix;
 288             if (info->flags & GUI) {
 289                 projectionMatrix = osg::Matrix::ortho2D(0, info->width, 0, info->height);
 290             } else if ((info->flags & PROJECTION_ABSOLUTE) != 0) {
 291                 if (info->flags & ENABLE_MASTER_ZOOM) {
 292                     if (info->relativeCameraParent < _cameras.size()) {
 293                         // template projection matrix and view matrix of the current camera
 294                         osg::Matrix P0 = slave._projectionOffset;
 295                         osg::Matrix R = viewMatrix;
 296
 297                         // The already known projection and view matrix of the parent camera
 298                         const CameraInfo* parentInfo = _cameras[info->relativeCameraParent].get();
 299                         RenderStageInfo prsi = parentInfo->cameras.find(MAIN_CAMERA)->second;
 300                         osg::Matrix pP = prsi.camera->getProjectionMatrix();
 301                         osg::Matrix pR = prsi.camera->getViewMatrix();
 302
 303                         // And the projection matrix derived from P0 so that the reference points match
 304                         projectionMatrix = relativeProjection(P0, R, info->thisReference,
 305                                                               pP, pR, info->parentReference);
 306
 307                     } else {
 308                         // We want to zoom, so take the original matrix and apply the zoom to it.
 309                         projectionMatrix = slave._projectionOffset;
 310                         projectionMatrix.postMultScale(osg::Vec3d(masterZoomFactor, masterZoomFactor, 1));
 311                     }
 312                 } else {
 313                     projectionMatrix = slave._projectionOffset;
 314                 }
 315             } else {
 316                 projectionMatrix = masterProj * slave._projectionOffset;
 317             }
 318
 319             CameraMap::const_iterator ii = info->cameras.find(FAR_CAMERA);
 320             if (ii == info->cameras.end() || !ii->second.camera.valid()) {
 321                 camera->setProjectionMatrix(projectionMatrix);
 322             } else {
 323                 Camera* farCamera = ii->second.camera;
 324                 farCamera->setViewMatrix(viewMatrix);
 325                 double left, right, bottom, top, parentNear, parentFar;
 326                 projectionMatrix.getFrustum(left, right, bottom, top,
 327                                             parentNear, parentFar);
 328                 if ((info->flags & FIXED_NEAR_FAR) == 0) {
 329                     parentNear = _zNear;
 330                     parentFar = _zFar;
 331                 }
 332                 if (parentFar < _nearField || _nearField == 0.0f) {
 333                     camera->setProjectionMatrix(projectionMatrix);
 334                     camera->setCullMask(camera->getCullMask()
 335                                         | simgear::BACKGROUND_BIT);
 336                     camera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
 337                     farCamera->setNodeMask(0);
 338                 } else {
 339                     Matrix nearProj, farProj;
 340                     makeNewProjMat(projectionMatrix, parentNear, _nearField,
 341                                    nearProj);
 342                     makeNewProjMat(projectionMatrix, _nearField, parentFar,
 343                                    farProj);
 344                     camera->setProjectionMatrix(nearProj);
 345                     camera->setCullMask(camera->getCullMask()
 346                                         & ~simgear::BACKGROUND_BIT);
 347                     camera->setClearMask(GL_DEPTH_BUFFER_BIT);
 348                     farCamera->setProjectionMatrix(farProj);
 349                     farCamera->setNodeMask(camera->getNodeMask());
 350                 }
 351             }
 352         } else {
 353             bool viewDone = false;
 354             Matrix viewMatrix;
 355             bool projectionDone = false;
 356             Matrix projectionMatrix;
 357             for ( CameraMap::const_iterator ii = info->cameras.begin(); ii != info->cameras.end(); ++ii ) {
 358                 if ( ii->first == SHADOW_CAMERA ) {
 359                     globals->get_renderer()->updateShadowCamera(info, position);
 360                     continue;
 361                 }
 362                 if ( ii->second.fullscreen )
 363                     continue;
 364
 365                 Camera* camera = ii->second.camera.get();
 366                 int slaveIndex = ii->second.slaveIndex;
 367                 const View::Slave& slave = _viewer->getSlave(slaveIndex);
 368
 369                 if ( !viewDone ) {
 370                     if ((info->flags & VIEW_ABSOLUTE) != 0)
 371                         viewMatrix = slave._viewOffset;
 372                     else
 373                         viewMatrix = masterView * slave._viewOffset;
 374                     viewDone = true;
 375                 }
 376
 377                 camera->setViewMatrix( viewMatrix );
 378
 379                 if ( !projectionDone ) {
 380                     if ((info->flags & PROJECTION_ABSOLUTE) != 0) {
 381                         if (info->flags & ENABLE_MASTER_ZOOM) {
 382                             if (info->relativeCameraParent < _cameras.size()) {
 383                                 // template projection matrix and view matrix of the current camera
 384                                 osg::Matrix P0 = slave._projectionOffset;
 385                                 osg::Matrix R = viewMatrix;
 386
 387                                 // The already known projection and view matrix of the parent camera
 388                                 const CameraInfo* parentInfo = _cameras[info->relativeCameraParent].get();
 389                                 RenderStageInfo prsi = parentInfo->cameras.find(MAIN_CAMERA)->second;
 390                                 osg::Matrix pP = prsi.camera->getProjectionMatrix();
 391                                 osg::Matrix pR = prsi.camera->getViewMatrix();
 392
 393                                 // And the projection matrix derived from P0 so that the reference points match
 394                                 projectionMatrix = relativeProjection(P0, R, info->thisReference,
 395                                                                       pP, pR, info->parentReference);
 396
 397                             } else {
 398                                 // We want to zoom, so take the original matrix and apply the zoom to it.
 399                                 projectionMatrix = slave._projectionOffset;
 400                                 projectionMatrix.postMultScale(osg::Vec3d(masterZoomFactor, masterZoomFactor, 1));
 401                             }
 402                         } else {
 403                             projectionMatrix = slave._projectionOffset;
 404                         }
 405                     } else {
 406                         projectionMatrix = masterProj * slave._projectionOffset;
 407                     }
 408                     projectionDone = true;
 409                 }
 410
 411                 camera->setProjectionMatrix(projectionMatrix);
 412             }
 413         }
 414     }
 415
 416     globals->get_renderer()->setPlanes( _zNear, _zFar );
 417 }
 418
 419 void CameraGroup::setCameraParameters(float vfov, float aspectRatio)
 420 {
 421     if (vfov != 0.0f && aspectRatio != 0.0f)
 422         _viewer->getCamera()
 423             ->setProjectionMatrixAsPerspective(vfov,
 424                                                1.0f / aspectRatio,
 425                                                _zNear, _zFar);
 426 }
 427
 428 double CameraGroup::getMasterAspectRatio() const
 429 {
 430     if (_cameras.empty())
 431         return 0.0;
 432
 433     const CameraInfo* info = _cameras.front();
 434
 435     osg::Camera* camera = info->getCamera(MAIN_CAMERA);
 436     if ( !camera )
 437         camera = info->getCamera( GEOMETRY_CAMERA );
 438     const osg::Viewport* viewport = camera->getViewport();
 439     if (!viewport) {
 440         return 0.0;
 441     }
 442
 443     return static_cast<double>(viewport->height()) / viewport->width();
 444 }
 445
 446 }
 447
 448 namespace
 449 {
 450 // A raw value for property nodes that references a class member via
 451 // an osg::ref_ptr.
 452 template<class C, class T>
 453 class RefMember : public SGRawValue<T>
 454 {
 455 public:
 456     RefMember (C *obj, T C::*ptr)
 457         : _obj(obj), _ptr(ptr) {}
 458     virtual ~RefMember () {}
 459     virtual T getValue () const
 460     {
 461         return _obj.get()->*_ptr;
 462     }
 463     virtual bool setValue (T value)
 464     {
 465         _obj.get()->*_ptr = value;
 466         return true;
 467     }
 468     virtual SGRawValue<T> * clone () const
 469     {
 470         return new RefMember(_obj.get(), _ptr);
 471     }
 472 private:
 473     ref_ptr<C> _obj;
 474     T C::* const _ptr;
 475 };
 476
 477 template<typename C, typename T>
 478 RefMember<C, T> makeRefMember(C *obj, T C::*ptr)
 479 {
 480     return RefMember<C, T>(obj, ptr);
 481 }
 482
 483 template<typename C, typename T>
 484 void bindMemberToNode(SGPropertyNode* parent, const char* childName,
 485                       C* obj, T C::*ptr, T value)
 486 {
 487     SGPropertyNode* valNode = parent->getNode(childName);
 488     RefMember<C, T> refMember = makeRefMember(obj, ptr);
 489     if (!valNode) {
 490         valNode = parent->getNode(childName, true);
 491         valNode->tie(refMember, false);
 492         setValue(valNode, value);
 493     } else {
 494         valNode->tie(refMember, true);
 495     }
 496 }
 497
 498 void buildViewport(flightgear::CameraInfo* info, SGPropertyNode* viewportNode,
 499                    const osg::GraphicsContext::Traits *traits)
 500 {
 501     using namespace flightgear;
 502     bindMemberToNode(viewportNode, "x", info, &CameraInfo::x, 0.0);
 503     bindMemberToNode(viewportNode, "y", info, &CameraInfo::y, 0.0);
 504     bindMemberToNode(viewportNode, "width", info, &CameraInfo::width,
 505                      static_cast<double>(traits->width));
 506     bindMemberToNode(viewportNode, "height", info, &CameraInfo::height,
 507                      static_cast<double>(traits->height));
 508 }
 509 }
 510
 511 namespace flightgear
 512 {
 513
 514 // Mostly copied from osg's osgViewer/View.cpp
 515
 516 static osg::Geometry* createPanoramicSphericalDisplayDistortionMesh(
 517     const Vec3& origin, const Vec3& widthVector, const Vec3& heightVector,
 518     double sphere_radius, double collar_radius,
 519     Image* intensityMap = 0, const Matrix& projectorMatrix = Matrix())
 520 {
 521     osg::Vec3d center(0.0,0.0,0.0);
 522     osg::Vec3d eye(0.0,0.0,0.0);
 523
 524     double distance = sqrt(sphere_radius*sphere_radius - collar_radius*collar_radius);
 525     bool flip = false;
 526     bool texcoord_flip = false;
 527
 528 #if 0
 529     osg::Vec3d projector = eye - osg::Vec3d(0.0,0.0, distance);
 530
 531     OSG_INFO<<"createPanoramicSphericalDisplayDistortionMesh : Projector position = "<<projector<<std::endl;
 532     OSG_INFO<<"createPanoramicSphericalDisplayDistortionMesh : distance = "<<distance<<std::endl;
 533 #endif
 534     // create the quad to visualize.
 535     osg::Geometry* geometry = new osg::Geometry();
 536
 537     geometry->setSupportsDisplayList(false);
 538
 539     osg::Vec3 xAxis(widthVector);
 540     float width = widthVector.length();
 541     xAxis /= width;
 542
 543     osg::Vec3 yAxis(heightVector);
 544     float height = heightVector.length();
 545     yAxis /= height;
 546
 547     int noSteps = 160;
 548
 549     osg::Vec3Array* vertices = new osg::Vec3Array;
 550     osg::Vec2Array* texcoords0 = new osg::Vec2Array;
 551     osg::Vec2Array* texcoords1 = intensityMap==0 ? new osg::Vec2Array : 0;
 552     osg::Vec4Array* colors = new osg::Vec4Array;
 553
 554 #if 0
 555     osg::Vec3 bottom = origin;
 556     osg::Vec3 dx = xAxis*(width/((float)(noSteps-2)));
 557     osg::Vec3 dy = yAxis*(height/((float)(noSteps-1)));
 558 #endif
 559     osg::Vec3 top = origin + yAxis*height;
 560
 561     osg::Vec3 screenCenter = origin + widthVector*0.5f + heightVector*0.5f;
 562     float screenRadius = heightVector.length() * 0.5f;
 563
 564     geometry->getOrCreateStateSet()->setMode(GL_CULL_FACE, osg::StateAttribute::OFF | osg::StateAttribute::PROTECTED);
 565
 566     for(int i=0;i<noSteps;++i)
 567     {
 568         //osg::Vec3 cursor = bottom+dy*(float)i;
 569         for(int j=0;j<noSteps;++j)
 570         {
 571             osg::Vec2 texcoord(double(i)/double(noSteps-1), double(j)/double(noSteps-1));
 572             double theta = texcoord.x() * 2.0 * osg::PI;
 573             double phi = (1.0-texcoord.y()) * osg::PI;
 574
 575             if (texcoord_flip) texcoord.y() = 1.0f - texcoord.y();
 576
 577             osg::Vec3 pos(sin(phi)*sin(theta), sin(phi)*cos(theta), cos(phi));
 578             pos = pos*projectorMatrix;
 579
 580             double alpha = atan2(pos.x(), pos.y());
 581             if (alpha<0.0) alpha += 2.0*osg::PI;
 582
 583             double beta = atan2(sqrt(pos.x()*pos.x() + pos.y()*pos.y()), pos.z());
 584             if (beta<0.0) beta += 2.0*osg::PI;
 585
 586             double gamma = atan2(sqrt(double(pos.x()*pos.x() + pos.y()*pos.y())), double(pos.z()+distance));
 587             if (gamma<0.0) gamma += 2.0*osg::PI;
 588
 589
 590             osg::Vec3 v = screenCenter + osg::Vec3(sin(alpha)*gamma*2.0/osg::PI, -cos(alpha)*gamma*2.0/osg::PI, 0.0f)*screenRadius;
 591
 592             if (flip)
 593                 vertices->push_back(osg::Vec3(v.x(), top.y()-(v.y()-origin.y()),v.z()));
 594             else
 595                 vertices->push_back(v);
 596
 597             texcoords0->push_back( texcoord );
 598
 599             osg::Vec2 texcoord1(alpha/(2.0*osg::PI), 1.0f - beta/osg::PI);
 600             if (intensityMap)
 601             {
 602                 colors->push_back(intensityMap->getColor(texcoord1));
 603             }
 604             else
 605             {
 606                 colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
 607                 if (texcoords1) texcoords1->push_back( texcoord1 );
 608             }
 609
 610
 611         }
 612     }
 613
 614
 615     // pass the created vertex array to the points geometry object.
 616     geometry->setVertexArray(vertices);
 617
 618     geometry->setColorArray(colors);
 619     geometry->setColorBinding(osg::Geometry::BIND_PER_VERTEX);
 620
 621     geometry->setTexCoordArray(0,texcoords0);
 622     if (texcoords1) geometry->setTexCoordArray(1,texcoords1);
 623
 624     osg::DrawElementsUShort* elements = new osg::DrawElementsUShort(osg::PrimitiveSet::TRIANGLES);
 625     geometry->addPrimitiveSet(elements);
 626
 627     for(int i=0;i<noSteps-1;++i)
 628     {
 629         for(int j=0;j<noSteps-1;++j)
 630         {
 631             int i1 = j+(i+1)*noSteps;
 632             int i2 = j+(i)*noSteps;
 633             int i3 = j+1+(i)*noSteps;
 634             int i4 = j+1+(i+1)*noSteps;
 635
 636             osg::Vec3& v1 = (*vertices)[i1];
 637             osg::Vec3& v2 = (*vertices)[i2];
 638             osg::Vec3& v3 = (*vertices)[i3];
 639             osg::Vec3& v4 = (*vertices)[i4];
 640
 641             if ((v1-screenCenter).length()>screenRadius) continue;
 642             if ((v2-screenCenter).length()>screenRadius) continue;
 643             if ((v3-screenCenter).length()>screenRadius) continue;
 644             if ((v4-screenCenter).length()>screenRadius) continue;
 645
 646             elements->push_back(i1);
 647             elements->push_back(i2);
 648             elements->push_back(i3);
 649
 650             elements->push_back(i1);
 651             elements->push_back(i3);
 652             elements->push_back(i4);
 653         }
 654     }
 655
 656     return geometry;
 657 }
 658
 659 void CameraGroup::buildDistortionCamera(const SGPropertyNode* psNode,
 660                                         Camera* camera)
 661 {
 662     const SGPropertyNode* texNode = psNode->getNode("texture");
 663     if (!texNode) {
 664         // error
 665         return;
 666     }
 667     string texName = texNode->getStringValue();
 668     TextureMap::iterator itr = _textureTargets.find(texName);
 669     if (itr == _textureTargets.end()) {
 670         // error
 671         return;
 672     }
 673     Viewport* viewport = camera->getViewport();
 674     float width = viewport->width();
 675     float height = viewport->height();
 676     TextureRectangle* texRect = itr->second.get();
 677     double radius = psNode->getDoubleValue("radius", 1.0);
 678     double collar = psNode->getDoubleValue("collar", 0.45);
 679     Geode* geode = new Geode();
 680     geode->addDrawable(createPanoramicSphericalDisplayDistortionMesh(
 681                            Vec3(0.0f,0.0f,0.0f), Vec3(width,0.0f,0.0f),
 682                            Vec3(0.0f,height,0.0f), radius, collar));
 683
 684     // new we need to add the texture to the mesh, we do so by creating a
 685     // StateSet to contain the Texture StateAttribute.
 686     StateSet* stateset = geode->getOrCreateStateSet();
 687     stateset->setTextureAttributeAndModes(0, texRect, StateAttribute::ON);
 688     stateset->setMode(GL_LIGHTING, StateAttribute::OFF);
 689
 690     TexMat* texmat = new TexMat;
 691     texmat->setScaleByTextureRectangleSize(true);
 692     stateset->setTextureAttributeAndModes(0, texmat, osg::StateAttribute::ON);
 693 #if 0
 694     if (!applyIntensityMapAsColours && intensityMap)
 695     {
 696         stateset->setTextureAttributeAndModes(1, new osg::Texture2D(intensityMap), osg::StateAttribute::ON);
 697     }
 698 #endif
 699     // add subgraph to render
 700     camera->addChild(geode);
 701     camera->setClearMask(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
 702     camera->setClearColor(osg::Vec4(0.0, 0.0, 0.0, 1.0));
 703     camera->setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR);
 704     camera->setCullingMode(osg::CullSettings::NO_CULLING);
 705     camera->setName("DistortionCorrectionCamera");
 706 }
 707
 708 CameraInfo* CameraGroup::buildCamera(SGPropertyNode* cameraNode)
 709 {
 710     WindowBuilder *wBuild = WindowBuilder::getWindowBuilder();
 711     const SGPropertyNode* windowNode = cameraNode->getNode("window");
 712     GraphicsWindow* window = 0;
 713     int cameraFlags = DO_INTERSECTION_TEST;
 714     if (windowNode) {
 715         // New style window declaration / definition
 716         window = wBuild->buildWindow(windowNode);
 717     } else {
 718         // Old style: suck window params out of camera block
 719         window = wBuild->buildWindow(cameraNode);
 720     }
 721     if (!window) {
 722         return 0;
 723     }
 724     Camera* camera = new Camera;
 725     camera->setAllowEventFocus(false);
 726     camera->setGraphicsContext(window->gc.get());
 727     camera->setViewport(new Viewport);
 728     camera->setCullingMode(CullSettings::SMALL_FEATURE_CULLING
 729                            | CullSettings::VIEW_FRUSTUM_CULLING);
 730     camera->setInheritanceMask(CullSettings::ALL_VARIABLES
 731                                & ~(CullSettings::CULL_MASK
 732                                    | CullSettings::CULLING_MODE
 733 #if defined(HAVE_CULLSETTINGS_CLEAR_MASK)
 734                                    | CullSettings::CLEAR_MASK
 735 #endif
 736                                    ));
 737
 738     osg::Matrix vOff;
 739     const SGPropertyNode* viewNode = cameraNode->getNode("view");
 740     if (viewNode) {
 741         double heading = viewNode->getDoubleValue("heading-deg", 0.0);
 742         double pitch = viewNode->getDoubleValue("pitch-deg", 0.0);
 743         double roll = viewNode->getDoubleValue("roll-deg", 0.0);
 744         double x = viewNode->getDoubleValue("x", 0.0);
 745         double y = viewNode->getDoubleValue("y", 0.0);
 746         double z = viewNode->getDoubleValue("z", 0.0);
 747         // Build a view matrix, which is the inverse of a model
 748         // orientation matrix.
 749         vOff = (Matrix::translate(-x, -y, -z)
 750                 * Matrix::rotate(-DegreesToRadians(heading),
 751                                  Vec3d(0.0, 1.0, 0.0),
 752                                  -DegreesToRadians(pitch),
 753                                  Vec3d(1.0, 0.0, 0.0),
 754                                  -DegreesToRadians(roll),
 755                                  Vec3d(0.0, 0.0, 1.0)));
 756         if (viewNode->getBoolValue("absolute", false))
 757             cameraFlags |= VIEW_ABSOLUTE;
 758     } else {
 759         // Old heading parameter, works in the opposite direction
 760         double heading = cameraNode->getDoubleValue("heading-deg", 0.0);
 761         vOff.makeRotate(DegreesToRadians(heading), osg::Vec3(0, 1, 0));
 762     }
 763     // Configuring the physical dimensions of a monitor
 764     SGPropertyNode* viewportNode = cameraNode->getNode("viewport", true);
 765     double physicalWidth = viewportNode->getDoubleValue("width", 1024);
 766     double physicalHeight = viewportNode->getDoubleValue("height", 768);
 767     double bezelHeightTop = 0;
 768     double bezelHeightBottom = 0;
 769     double bezelWidthLeft = 0;
 770     double bezelWidthRight = 0;
 771     const SGPropertyNode* physicalDimensionsNode = 0;
 772     if ((physicalDimensionsNode = cameraNode->getNode("physical-dimensions")) != 0) {
 773         physicalWidth = physicalDimensionsNode->getDoubleValue("width", physicalWidth);
 774         physicalHeight = physicalDimensionsNode->getDoubleValue("height", physicalHeight);
 775         const SGPropertyNode* bezelNode = 0;
 776         if ((bezelNode = physicalDimensionsNode->getNode("bezel")) != 0) {
 777             bezelHeightTop = bezelNode->getDoubleValue("top", bezelHeightTop);
 778             bezelHeightBottom = bezelNode->getDoubleValue("bottom", bezelHeightBottom);
 779             bezelWidthLeft = bezelNode->getDoubleValue("left", bezelWidthLeft);
 780             bezelWidthRight = bezelNode->getDoubleValue("right", bezelWidthRight);
 781         }
 782     }
 783     osg::Matrix pOff;
 784     unsigned parentCameraIndex = ~0u;
 785     osg::Vec2d parentReference[2];
 786     osg::Vec2d thisReference[2];
 787     SGPropertyNode* projectionNode = 0;
 788     if ((projectionNode = cameraNode->getNode("perspective")) != 0) {
 789         double fovy = projectionNode->getDoubleValue("fovy-deg", 55.0);
 790         double aspectRatio = projectionNode->getDoubleValue("aspect-ratio",
 791                                                             1.0);
 792         double zNear = projectionNode->getDoubleValue("near", 0.0);
 793         double zFar = projectionNode->getDoubleValue("far", zNear + 20000);
 794         double offsetX = projectionNode->getDoubleValue("offset-x", 0.0);
 795         double offsetY = projectionNode->getDoubleValue("offset-y", 0.0);
 796         double tan_fovy = tan(DegreesToRadians(fovy*0.5));
 797         double right = tan_fovy * aspectRatio * zNear + offsetX;
 798         double left = -tan_fovy * aspectRatio * zNear + offsetX;
 799         double top = tan_fovy * zNear + offsetY;
 800         double bottom = -tan_fovy * zNear + offsetY;
 801         pOff.makeFrustum(left, right, bottom, top, zNear, zFar);
 802         cameraFlags |= PROJECTION_ABSOLUTE;
 803         if (projectionNode->getBoolValue("fixed-near-far", true))
 804             cameraFlags |= FIXED_NEAR_FAR;
 805     } else if ((projectionNode = cameraNode->getNode("frustum")) != 0
 806                || (projectionNode = cameraNode->getNode("ortho")) != 0) {
 807         double top = projectionNode->getDoubleValue("top", 0.0);
 808         double bottom = projectionNode->getDoubleValue("bottom", 0.0);
 809         double left = projectionNode->getDoubleValue("left", 0.0);
 810         double right = projectionNode->getDoubleValue("right", 0.0);
 811         double zNear = projectionNode->getDoubleValue("near", 0.0);
 812         double zFar = projectionNode->getDoubleValue("far", zNear + 20000);
 813         if (cameraNode->getNode("frustum")) {
 814             pOff.makeFrustum(left, right, bottom, top, zNear, zFar);
 815             cameraFlags |= PROJECTION_ABSOLUTE;
 816         } else {
 817             pOff.makeOrtho(left, right, bottom, top, zNear, zFar);
 818             cameraFlags |= (PROJECTION_ABSOLUTE | ORTHO);
 819         }
 820         if (projectionNode->getBoolValue("fixed-near-far", true))
 821             cameraFlags |= FIXED_NEAR_FAR;
 822     } else if ((projectionNode = cameraNode->getNode("master-perspective")) != 0) {
 823         double zNear = projectionNode->getDoubleValue("eye-distance", 0.4*physicalWidth);
 824         double xoff = projectionNode->getDoubleValue("x-offset", 0);
 825         double yoff = projectionNode->getDoubleValue("y-offset", 0);
 826         double left = -0.5*physicalWidth - xoff;
 827         double right = 0.5*physicalWidth - xoff;
 828         double bottom = -0.5*physicalHeight - yoff;
 829         double top = 0.5*physicalHeight - yoff;
 830         pOff.makeFrustum(left, right, bottom, top, zNear, zNear*1000);
 831         cameraFlags |= PROJECTION_ABSOLUTE | ENABLE_MASTER_ZOOM;
 832     } else if ((projectionNode = cameraNode->getNode("right-of-perspective"))
 833                || (projectionNode = cameraNode->getNode("left-of-perspective"))
 834                || (projectionNode = cameraNode->getNode("above-perspective"))
 835                || (projectionNode = cameraNode->getNode("below-perspective"))
 836                || (projectionNode = cameraNode->getNode("reference-points-perspective"))) {
 837         std::string name = projectionNode->getStringValue("parent-camera");
 838         for (unsigned i = 0; i < _cameras.size(); ++i) {
 839             if (_cameras[i]->name != name)
 840                 continue;
 841             parentCameraIndex = i;
 842         }
 843         if (_cameras.size() <= parentCameraIndex) {
 844             SG_LOG(SG_VIEW, SG_ALERT, "CameraGroup::buildCamera: "
 845                    "failed to find parent camera for relative camera!");
 846             return 0;
 847         }
 848         const CameraInfo* parentInfo = _cameras[parentCameraIndex].get();
 849         if (projectionNode->getNameString() == "right-of-perspective") {
 850             double tmp = (parentInfo->physicalWidth + 2*parentInfo->bezelWidthRight)/parentInfo->physicalWidth;
 851             parentReference[0] = osg::Vec2d(tmp, -1);
 852             parentReference[1] = osg::Vec2d(tmp, 1);
 853             tmp = (physicalWidth + 2*bezelWidthLeft)/physicalWidth;
 854             thisReference[0] = osg::Vec2d(-tmp, -1);
 855             thisReference[1] = osg::Vec2d(-tmp, 1);
 856         } else if (projectionNode->getNameString() == "left-of-perspective") {
 857             double tmp = (parentInfo->physicalWidth + 2*parentInfo->bezelWidthLeft)/parentInfo->physicalWidth;
 858             parentReference[0] = osg::Vec2d(-tmp, -1);
 859             parentReference[1] = osg::Vec2d(-tmp, 1);
 860             tmp = (physicalWidth + 2*bezelWidthRight)/physicalWidth;
 861             thisReference[0] = osg::Vec2d(tmp, -1);
 862             thisReference[1] = osg::Vec2d(tmp, 1);
 863         } else if (projectionNode->getNameString() == "above-perspective") {
 864             double tmp = (parentInfo->physicalHeight + 2*parentInfo->bezelHeightTop)/parentInfo->physicalHeight;
 865             parentReference[0] = osg::Vec2d(-1, tmp);
 866             parentReference[1] = osg::Vec2d(1, tmp);
 867             tmp = (physicalHeight + 2*bezelHeightBottom)/physicalHeight;
 868             thisReference[0] = osg::Vec2d(-1, -tmp);
 869             thisReference[1] = osg::Vec2d(1, -tmp);
 870         } else if (projectionNode->getNameString() == "below-perspective") {
 871             double tmp = (parentInfo->physicalHeight + 2*parentInfo->bezelHeightBottom)/parentInfo->physicalHeight;
 872             parentReference[0] = osg::Vec2d(-1, -tmp);
 873             parentReference[1] = osg::Vec2d(1, -tmp);
 874             tmp = (physicalHeight + 2*bezelHeightTop)/physicalHeight;
 875             thisReference[0] = osg::Vec2d(-1, tmp);
 876             thisReference[1] = osg::Vec2d(1, tmp);
 877         } else if (projectionNode->getNameString() == "reference-points-perspective") {
 878             SGPropertyNode* parentNode = projectionNode->getNode("parent", true);
 879             SGPropertyNode* thisNode = projectionNode->getNode("this", true);
 880             SGPropertyNode* pointNode;
 881
 882             pointNode = parentNode->getNode("point", 0, true);
 883             parentReference[0][0] = pointNode->getDoubleValue("x", 0)*2/parentInfo->physicalWidth;
 884             parentReference[0][1] = pointNode->getDoubleValue("y", 0)*2/parentInfo->physicalHeight;
 885             pointNode = parentNode->getNode("point", 1, true);
 886             parentReference[1][0] = pointNode->getDoubleValue("x", 0)*2/parentInfo->physicalWidth;
 887             parentReference[1][1] = pointNode->getDoubleValue("y", 0)*2/parentInfo->physicalHeight;
 888
 889             pointNode = thisNode->getNode("point", 0, true);
 890             thisReference[0][0] = pointNode->getDoubleValue("x", 0)*2/physicalWidth;
 891             thisReference[0][1] = pointNode->getDoubleValue("y", 0)*2/physicalHeight;
 892             pointNode = thisNode->getNode("point", 1, true);
 893             thisReference[1][0] = pointNode->getDoubleValue("x", 0)*2/physicalWidth;
 894             thisReference[1][1] = pointNode->getDoubleValue("y", 0)*2/physicalHeight;
 895         }
 896
 897         pOff = osg::Matrix::perspective(45, physicalWidth/physicalHeight, 1, 20000);
 898         cameraFlags |= PROJECTION_ABSOLUTE | ENABLE_MASTER_ZOOM;
 899     } else {
 900         // old style shear parameters
 901         double shearx = cameraNode->getDoubleValue("shear-x", 0);
 902         double sheary = cameraNode->getDoubleValue("shear-y", 0);
 903         pOff.makeTranslate(-shearx, -sheary, 0);
 904     }
 905     const SGPropertyNode* textureNode = cameraNode->getNode("texture");
 906     if (textureNode) {
 907         string texName = textureNode->getStringValue("name");
 908         int tex_width = textureNode->getIntValue("width");
 909         int tex_height = textureNode->getIntValue("height");
 910         TextureRectangle* texture = new TextureRectangle;
 911
 912         texture->setTextureSize(tex_width, tex_height);
 913         texture->setInternalFormat(GL_RGB);
 914         texture->setFilter(Texture::MIN_FILTER, Texture::LINEAR);
 915         texture->setFilter(Texture::MAG_FILTER, Texture::LINEAR);
 916         texture->setWrap(Texture::WRAP_S, Texture::CLAMP_TO_EDGE);
 917         texture->setWrap(Texture::WRAP_T, Texture::CLAMP_TO_EDGE);
 918         camera->setDrawBuffer(GL_FRONT);
 919         camera->setReadBuffer(GL_FRONT);
 920         camera->setRenderTargetImplementation(Camera::FRAME_BUFFER_OBJECT);
 921         camera->attach(Camera::COLOR_BUFFER, texture);
 922         _textureTargets[texName] = texture;
 923     } else {
 924         camera->setDrawBuffer(GL_BACK);
 925         camera->setReadBuffer(GL_BACK);
 926     }
 927     const SGPropertyNode* psNode = cameraNode->getNode("panoramic-spherical");
 928     bool useMasterSceneGraph = !psNode;
 929     CameraInfo* info = globals->get_renderer()->buildRenderingPipeline(this, cameraFlags, camera, vOff, pOff,
 930                                                                         window->gc.get(), useMasterSceneGraph);
 931     info->name = cameraNode->getStringValue("name");
 932     info->physicalWidth = physicalWidth;
 933     info->physicalHeight = physicalHeight;
 934     info->bezelHeightTop = bezelHeightTop;
 935     info->bezelHeightBottom = bezelHeightBottom;
 936     info->bezelWidthLeft = bezelWidthLeft;
 937     info->bezelWidthRight = bezelWidthRight;
 938     info->relativeCameraParent = parentCameraIndex;
 939     info->parentReference[0] = parentReference[0];
 940     info->parentReference[1] = parentReference[1];
 941     info->thisReference[0] = thisReference[0];
 942     info->thisReference[1] = thisReference[1];
 943     // If a viewport isn't set on the camera, then it's hard to dig it
 944     // out of the SceneView objects in the viewer, and the coordinates
 945     // of mouse events are somewhat bizzare.
 946     buildViewport(info, viewportNode, window->gc->getTraits());
 947     info->updateCameras();
 948     // Distortion camera needs the viewport which is created by addCamera().
 949     if (psNode) {
 950         info->flags = info->flags | VIEW_ABSOLUTE;
 951         buildDistortionCamera(psNode, camera);
 952     }
 953     return info;
 954 }
 955
 956 CameraInfo* CameraGroup::buildGUICamera(SGPropertyNode* cameraNode,
 957                                         GraphicsWindow* window)
 958 {
 959     WindowBuilder *wBuild = WindowBuilder::getWindowBuilder();
 960     const SGPropertyNode* windowNode = (cameraNode
 961                                         ? cameraNode->getNode("window")
 962                                         : 0);
 963     if (!window && windowNode) {
 964       // New style window declaration / definition
 965       window = wBuild->buildWindow(windowNode);
 966     }
 967
 968     if (!window) { // buildWindow can fail
 969       SG_LOG(SG_VIEW, SG_WARN, "CameraGroup::buildGUICamera: failed to build a window");
 970       return NULL;
 971     }
 972
 973     Camera* camera = new Camera;
 974     camera->setName( "GUICamera" );
 975     camera->setAllowEventFocus(false);
 976     camera->setGraphicsContext(window->gc.get());
 977     camera->setViewport(new Viewport);
 978     camera->setClearMask(0);
 979     camera->setInheritanceMask(CullSettings::ALL_VARIABLES
 980                                & ~(CullSettings::COMPUTE_NEAR_FAR_MODE
 981                                    | CullSettings::CULLING_MODE
 982 #if defined(HAVE_CULLSETTINGS_CLEAR_MASK)
 983                                    | CullSettings::CLEAR_MASK
 984 #endif
 985                                    ));
 986     camera->setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR);
 987     camera->setCullingMode(osg::CullSettings::NO_CULLING);
 988     camera->setProjectionResizePolicy(Camera::FIXED);
 989     camera->setReferenceFrame(Transform::ABSOLUTE_RF);
 990     const int cameraFlags = GUI | DO_INTERSECTION_TEST;
 991
 992     CameraInfo* result = new CameraInfo(cameraFlags);
 993     // The camera group will always update the camera
 994     camera->setReferenceFrame(Transform::ABSOLUTE_RF);
 995
 996     getViewer()->addSlave(camera, Matrixd::identity(), Matrixd::identity(), false);
 997     //installCullVisitor(camera);
 998     int slaveIndex = getViewer()->getNumSlaves() - 1;
 999     result->addCamera( MAIN_CAMERA, camera, slaveIndex );
1000     camera->setRenderOrder(Camera::POST_RENDER, slaveIndex);
1001     addCamera(result);
1002
1003     // XXX Camera needs to be drawn last; eventually the render order
1004     // should be assigned by a camera manager.
1005     camera->setRenderOrder(osg::Camera::POST_RENDER, 10000);
1006     SGPropertyNode* viewportNode = cameraNode->getNode("viewport", true);
1007     buildViewport(result, viewportNode, window->gc->getTraits());
1008
1009     // Disable statistics for the GUI camera.
1010     camera->setStats(0);
1011     result->updateCameras();
1012     return result;
1013 }
1014
1015 CameraGroup* CameraGroup::buildCameraGroup(osgViewer::Viewer* viewer,
1016                                            SGPropertyNode* gnode)
1017 {
1018     sgUserDataInit( globals->get_props() );
1019
1020     CameraGroup* cgroup = new CameraGroup(viewer);
1021     for (int i = 0; i < gnode->nChildren(); ++i) {
1022         SGPropertyNode* pNode = gnode->getChild(i);
1023         const char* name = pNode->getName();
1024         if (!strcmp(name, "camera")) {
1025             cgroup->buildCamera(pNode);
1026         } else if (!strcmp(name, "window")) {
1027             WindowBuilder::getWindowBuilder()->buildWindow(pNode);
1028         } else if (!strcmp(name, "gui")) {
1029             cgroup->buildGUICamera(pNode);
1030         }
1031     }
1032     bindMemberToNode(gnode, "znear", cgroup, &CameraGroup::_zNear, .1f);
1033     bindMemberToNode(gnode, "zfar", cgroup, &CameraGroup::_zFar, 120000.0f);
1034     bindMemberToNode(gnode, "near-field", cgroup, &CameraGroup::_nearField,
1035                      100.0f);
1036     return cgroup;
1037 }
1038
1039 void CameraGroup::setCameraCullMasks(Node::NodeMask nm)
1040 {
1041     for (CameraIterator i = camerasBegin(), e = camerasEnd(); i != e; ++i) {
1042         CameraInfo* info = i->get();
1043         if (info->flags & GUI)
1044             continue;
1045         osg::ref_ptr<osg::Camera> farCamera = info->getCamera(FAR_CAMERA);
1046         osg::Camera* camera = info->getCamera( MAIN_CAMERA );
1047         if ( camera == 0 )
1048             camera = info->getCamera( GEOMETRY_CAMERA );
1049         if (farCamera.valid() && farCamera->getNodeMask() != 0) {
1050             camera->setCullMask(nm & ~simgear::BACKGROUND_BIT);
1051             camera->setCullMaskLeft(nm & ~simgear::BACKGROUND_BIT);
1052             camera->setCullMaskRight(nm & ~simgear::BACKGROUND_BIT);
1053             farCamera->setCullMask(nm);
1054             farCamera->setCullMaskLeft(nm);
1055             farCamera->setCullMaskRight(nm);
1056         } else {
1057             camera->setCullMask(nm);
1058             camera->setCullMaskLeft(nm);
1059             camera->setCullMaskRight(nm);
1060         }
1061     }
1062 }
1063
1064 void CameraGroup::resized()
1065 {
1066     for (CameraIterator i = camerasBegin(), e = camerasEnd(); i != e; ++i) {
1067         CameraInfo *info = i->get();
1068         Camera* camera = info->getCamera( MAIN_CAMERA );
1069         if ( camera == 0 )
1070             camera = info->getCamera( DISPLAY_CAMERA );
1071         const Viewport* viewport = camera->getViewport();
1072         info->x = viewport->x();
1073         info->y = viewport->y();
1074         info->width = viewport->width();
1075         info->height = viewport->height();
1076
1077         info->resized( info->width, info->height );
1078     }
1079 }
1080
1081 const CameraInfo* CameraGroup::getGUICamera() const
1082 {
1083     ConstCameraIterator result
1084         = std::find_if(camerasBegin(), camerasEnd(),
1085                    FlagTester<CameraInfo>(GUI));
1086     if (result == camerasEnd()) {
1087         return NULL;
1088     }
1089
1090     return *result;
1091 }
1092
1093 Camera* getGUICamera(CameraGroup* cgroup)
1094 {
1095     const CameraInfo* info = cgroup->getGUICamera();
1096     if (!info) {
1097         return NULL;
1098     }
1099
1100     return info->getCamera(MAIN_CAMERA);
1101 }
1102
1103 static bool computeCameraIntersection(const CameraInfo* cinfo,
1104                                       const osgGA::GUIEventAdapter* ea,
1105                                       osgUtil::LineSegmentIntersector::Intersections& intersections)
1106 {
1107   using osgUtil::Intersector;
1108   using osgUtil::LineSegmentIntersector;
1109   double x, y;
1110   eventToWindowCoords(ea, x, y);
1111
1112   if (!(cinfo->flags & CameraGroup::DO_INTERSECTION_TEST))
1113     return false;
1114
1115   const Camera* camera = cinfo->getCamera(MAIN_CAMERA);
1116   if ( !camera )
1117     camera = cinfo->getCamera( GEOMETRY_CAMERA );
1118   if (camera->getGraphicsContext() != ea->getGraphicsContext())
1119     return false;
1120
1121   const Viewport* viewport = camera->getViewport();
1122   double epsilon = 0.5;
1123   if (!(x >= viewport->x() - epsilon
1124         && x < viewport->x() + viewport->width() -1.0 + epsilon
1125         && y >= viewport->y() - epsilon
1126         && y < viewport->y() + viewport->height() -1.0 + epsilon))
1127     return false;
1128
1129   Vec4d start(x, y, 0.0, 1.0);
1130   Vec4d end(x, y, 1.0, 1.0);
1131   Matrix windowMat = viewport->computeWindowMatrix();
1132   Matrix startPtMat = Matrix::inverse(camera->getProjectionMatrix()
1133                                       * windowMat);
1134   Matrix endPtMat;
1135   const Camera* farCamera = cinfo->getCamera( FAR_CAMERA );
1136   if (!farCamera || farCamera->getNodeMask() == 0)
1137     endPtMat = startPtMat;
1138   else
1139     endPtMat = Matrix::inverse(farCamera->getProjectionMatrix()
1140                                * windowMat);
1141   start = start * startPtMat;
1142   start /= start.w();
1143   end = end * endPtMat;
1144   end /= end.w();
1145   ref_ptr<LineSegmentIntersector> picker
1146   = new LineSegmentIntersector(Intersector::VIEW,
1147                                Vec3d(start.x(), start.y(), start.z()),
1148                                Vec3d(end.x(), end.y(), end.z()));
1149   osgUtil::IntersectionVisitor iv(picker.get());
1150   const_cast<Camera*>(camera)->accept(iv);
1151   if (picker->containsIntersections()) {
1152     intersections = picker->getIntersections();
1153     return true;
1154   }
1155
1156   return false;
1157 }
1158
1159 bool computeIntersections(const CameraGroup* cgroup,
1160                           const osgGA::GUIEventAdapter* ea,
1161                           osgUtil::LineSegmentIntersector::Intersections& intersections)
1162 {
1163     // test the GUI first
1164     const CameraInfo* guiCamera = cgroup->getGUICamera();
1165     if (guiCamera && computeCameraIntersection(guiCamera, ea, intersections))
1166         return true;
1167
1168     // Find camera that contains event
1169     for (CameraGroup::ConstCameraIterator iter = cgroup->camerasBegin(),
1170              e = cgroup->camerasEnd();
1171          iter != e;
1172          ++iter) {
1173         const CameraInfo* cinfo = iter->get();
1174         if (cinfo == guiCamera)
1175             continue;
1176
1177         if (computeCameraIntersection(cinfo, ea, intersections))
1178             return true;
1179     }
1180
1181     intersections.clear();
1182     return false;
1183 }
1184
1185 void warpGUIPointer(CameraGroup* cgroup, int x, int y)
1186 {
1187     using osgViewer::GraphicsWindow;
1188     Camera* guiCamera = getGUICamera(cgroup);
1189     if (!guiCamera)
1190         return;
1191     Viewport* vport = guiCamera->getViewport();
1192     GraphicsWindow* gw
1193         = dynamic_cast<GraphicsWindow*>(guiCamera->getGraphicsContext());
1194     if (!gw)
1195         return;
1196     globals->get_renderer()->getEventHandler()->setMouseWarped();
1197     // Translate the warp request into the viewport of the GUI camera,
1198     // send the request to the window, then transform the coordinates
1199     // for the Viewer's event queue.
1200     double wx = x + vport->x();
1201     double wyUp = vport->height() + vport->y() - y;
1202     double wy;
1203     const GraphicsContext::Traits* traits = gw->getTraits();
1204     if (gw->getEventQueue()->getCurrentEventState()->getMouseYOrientation()
1205         == osgGA::GUIEventAdapter::Y_INCREASING_DOWNWARDS) {
1206         wy = traits->height - wyUp;
1207     } else {
1208         wy = wyUp;
1209     }
1210     gw->getEventQueue()->mouseWarped(wx, wy);
1211     gw->requestWarpPointer(wx, wy);
1212     osgGA::GUIEventAdapter* eventState
1213         = cgroup->getViewer()->getEventQueue()->getCurrentEventState();
1214     double viewerX
1215         = (eventState->getXmin()
1216            + ((wx / double(traits->width))
1217               * (eventState->getXmax() - eventState->getXmin())));
1218     double viewerY
1219         = (eventState->getYmin()
1220            + ((wyUp / double(traits->height))
1221               * (eventState->getYmax() - eventState->getYmin())));
1222     cgroup->getViewer()->getEventQueue()->mouseWarped(viewerX, viewerY);
1223 }
1224 }