src/Viewer/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 <Main/fg_props.hxx>
  25 #include <Main/globals.hxx>
  26 #include "renderer.hxx"
  27 #include "FGEventHandler.hxx"
  28 #include "WindowBuilder.hxx"
  29 #include "WindowSystemAdapter.hxx"
  30
  31 #include <simgear/math/SGRect.hxx>
  32 #include <simgear/props/props.hxx>
  33 #include <simgear/structure/OSGUtils.hxx>
  34 #include <simgear/structure/OSGVersion.hxx>
  35 #include <simgear/scene/material/EffectCullVisitor.hxx>
  36 #include <simgear/scene/util/RenderConstants.hxx>
  37
  38 #include <algorithm>
  39 #include <cstring>
  40 #include <string>
  41
  42 #include <osg/Camera>
  43 #include <osg/Geometry>
  44 #include <osg/GraphicsContext>
  45 #include <osg/io_utils>
  46 #include <osg/Math>
  47 #include <osg/Matrix>
  48 #include <osg/Notify>
  49 #include <osg/Program>
  50 #include <osg/Quat>
  51 #include <osg/TexMat>
  52 #include <osg/Vec3d>
  53 #include <osg/Viewport>
  54
  55 #include <osgUtil/IntersectionVisitor>
  56
  57 #include <osgViewer/GraphicsWindow>
  58 #include <osgViewer/Renderer>
  59
  60 namespace flightgear {
  61 const char* MAIN_CAMERA = "main";
  62 const char* FAR_CAMERA = "far";
  63 const char* GEOMETRY_CAMERA = "geometry";
  64 const char* SHADOW_CAMERA = "shadow";
  65 const char* LIGHTING_CAMERA = "lighting";
  66 const char* DISPLAY_CAMERA = "display";
  67 }
  68
  69 static osg::Matrix
  70 invert(const osg::Matrix& matrix)
  71 {
  72     return osg::Matrix::inverse(matrix);
  73 }
  74
  75 /// Returns the zoom factor of the master camera.
  76 /// The reference fov is the historic 55 deg
  77 static double
  78 zoomFactor()
  79 {
  80     double fov = fgGetDouble("/sim/current-view/field-of-view", 55);
  81     if (fov < 1)
  82         fov = 1;
  83     return tan(55*0.5*SG_DEGREES_TO_RADIANS)/tan(fov*0.5*SG_DEGREES_TO_RADIANS);
  84 }
  85
  86 static osg::Vec2d
  87 preMult(const osg::Vec2d& v, const osg::Matrix& m)
  88 {
  89   osg::Vec3d tmp = m.preMult(osg::Vec3(v, 0));
  90   return osg::Vec2d(tmp[0], tmp[1]);
  91 }
  92
  93 static osg::Matrix
  94 relativeProjection(const osg::Matrix& P0, const osg::Matrix& R, const osg::Vec2d ref[2],
  95                    const osg::Matrix& pP, const osg::Matrix& pR, const osg::Vec2d pRef[2])
  96 {
  97   // Track the way from one projection space to the other:
  98   // We want
  99   //  P = T*S*P0
 100   // where P0 is the projection template sensible for the given window size,
 101   // T is a translation matrix and S a scale matrix.
 102   // We need to determine T and S so that the reference points in the parents
 103   // projection space match the two reference points in this cameras projection space.
 104
 105   // Starting from the parents camera projection space, we get into this cameras
 106   // projection space by the transform matrix:
 107   //  P*R*inv(pP*pR) = T*S*P0*R*inv(pP*pR)
 108   // So, at first compute that matrix without T*S and determine S and T from that
 109
 110   // Ok, now osg uses the inverse matrix multiplication order, thus:
 111   osg::Matrix PtoPwithoutTS = invert(pR*pP)*R*P0;
 112   // Compute the parents reference points in the current projection space
 113   // without the yet unknown T and S
 114   osg::Vec2d pRefInThis[2] = {
 115     preMult(pRef[0], PtoPwithoutTS),
 116     preMult(pRef[1], PtoPwithoutTS)
 117   };
 118
 119   // To get the same zoom, rescale to match the parents size
 120   double s = (ref[0] - ref[1]).length()/(pRefInThis[0] - pRefInThis[1]).length();
 121   osg::Matrix S = osg::Matrix::scale(s, s, 1);
 122
 123   // For the translation offset, incorporate the now known scale
 124   // and recompute the position ot the first reference point in the
 125   // currents projection space without the yet unknown T.
 126   pRefInThis[0] = preMult(pRef[0], PtoPwithoutTS*S);
 127   // The translation is then the difference of the reference points
 128   osg::Matrix T = osg::Matrix::translate(osg::Vec3d(ref[0] - pRefInThis[0], 0));
 129
 130   // Compose and return the desired final projection matrix
 131   return P0*S*T;
 132 }
 133
 134 namespace flightgear
 135 {
 136 using namespace osg;
 137
 138 using std::strcmp;
 139 using std::string;
 140
 141 ref_ptr<CameraGroup> CameraGroup::_defaultGroup;
 142
 143 CameraGroup::CameraGroup(osgViewer::Viewer* viewer) :
 144     _viewer(viewer)
 145 {
 146 }
 147
 148 }
 149
 150 namespace
 151 {
 152 using namespace osg;
 153
 154 // Given a projection matrix, return a new one with the same frustum
 155 // sides and new near / far values.
 156
 157 void makeNewProjMat(Matrixd& oldProj, double znear,
 158                                        double zfar, Matrixd& projection)
 159 {
 160     projection = oldProj;
 161     // Slightly inflate the near & far planes to avoid objects at the
 162     // extremes being clipped out.
 163     znear *= 0.999;
 164     zfar *= 1.001;
 165
 166     // Clamp the projection matrix z values to the range (near, far)
 167     double epsilon = 1.0e-6;
 168     if (fabs(projection(0,3)) < epsilon &&
 169         fabs(projection(1,3)) < epsilon &&
 170         fabs(projection(2,3)) < epsilon) {
 171         // Projection is Orthographic
 172         epsilon = -1.0/(zfar - znear); // Used as a temp variable
 173         projection(2,2) = 2.0*epsilon;
 174         projection(3,2) = (zfar + znear)*epsilon;
 175     } else {
 176         // Projection is Perspective
 177         double trans_near = (-znear*projection(2,2) + projection(3,2)) /
 178             (-znear*projection(2,3) + projection(3,3));
 179         double trans_far = (-zfar*projection(2,2) + projection(3,2)) /
 180             (-zfar*projection(2,3) + projection(3,3));
 181         double ratio = fabs(2.0/(trans_near - trans_far));
 182         double center = -0.5*(trans_near + trans_far);
 183
 184         projection.postMult(osg::Matrixd(1.0, 0.0, 0.0, 0.0,
 185                                          0.0, 1.0, 0.0, 0.0,
 186                                          0.0, 0.0, ratio, 0.0,
 187                                          0.0, 0.0, center*ratio, 1.0));
 188     }
 189 }
 190 }
 191
 192 namespace flightgear
 193 {
 194 void CameraInfo::updateCameras()
 195 {
 196     bufferSize->set( osg::Vec2f( width, height ) );
 197
 198     for (CameraMap::iterator ii = cameras.begin(); ii != cameras.end(); ++ii ) {
 199         float f = ii->second.scaleFactor;
 200         if ( f == 0.0f ) continue;
 201
 202         if (ii->second.camera->getRenderTargetImplementation() == osg::Camera::FRAME_BUFFER_OBJECT)
 203             ii->second.camera->getViewport()->setViewport(0, 0, width*f, height*f);
 204         else
 205             ii->second.camera->getViewport()->setViewport(x*f, y*f, width*f, height*f);
 206     }
 207
 208     for (RenderBufferMap::iterator ii = buffers.begin(); ii != buffers.end(); ++ii ) {
 209         float f = ii->second.scaleFactor;
 210         if ( f == 0.0f ) continue;
 211         osg::Texture2D* texture = ii->second.texture.get();
 212         if ( texture->getTextureHeight() != height*f || texture->getTextureWidth() != width*f ) {
 213             texture->setTextureSize( width*f, height*f );
 214             texture->dirtyTextureObject();
 215         }
 216     }
 217 }
 218
 219 void CameraInfo::resized(double w, double h)
 220 {
 221     if (w == 1.0 && h == 1.0)
 222         return;
 223
 224     bufferSize->set( osg::Vec2f( w, h ) );
 225
 226     for (RenderBufferMap::iterator ii = buffers.begin(); ii != buffers.end(); ++ii) {
 227         float s = ii->second.scaleFactor;
 228         if ( s == 0.0f ) continue;
 229         ii->second.texture->setTextureSize( w * s, h * s );
 230         ii->second.texture->dirtyTextureObject();
 231     }
 232
 233     for (CameraMap::iterator ii = cameras.begin(); ii != cameras.end(); ++ii) {
 234         RenderStageInfo& rsi = ii->second;
 235         if (!rsi.resizable ||
 236                 rsi.camera->getRenderTargetImplementation() != osg::Camera::FRAME_BUFFER_OBJECT ||
 237                 rsi.scaleFactor == 0.0f )
 238             continue;
 239
 240         Viewport* vp = rsi.camera->getViewport();
 241         vp->width() = w * rsi.scaleFactor;
 242         vp->height() = h * rsi.scaleFactor;
 243
 244         osgViewer::Renderer* renderer
 245             = static_cast<osgViewer::Renderer*>(rsi.camera->getRenderer());
 246         for (int i = 0; i < 2; ++i) {
 247             osgUtil::SceneView* sceneView = renderer->getSceneView(i);
 248             sceneView->getRenderStage()->setFrameBufferObject(0);
 249             sceneView->getRenderStage()->setCameraRequiresSetUp(true);
 250             if (sceneView->getRenderStageLeft()) {
 251                 sceneView->getRenderStageLeft()->setFrameBufferObject(0);
 252                 sceneView->getRenderStageLeft()->setCameraRequiresSetUp(true);
 253             }
 254             if (sceneView->getRenderStageRight()) {
 255                 sceneView->getRenderStageRight()->setFrameBufferObject(0);
 256                 sceneView->getRenderStageRight()->setCameraRequiresSetUp(true);
 257             }
 258         }
 259     }
 260 }
 261
 262 osg::Camera* CameraInfo::getCamera(const std::string& k) const
 263 {
 264     CameraMap::const_iterator ii = cameras.find( k );
 265     if (ii == cameras.end())
 266         return 0;
 267     return ii->second.camera.get();
 268 }
 269
 270 osg::Texture2D* CameraInfo::getBuffer(const std::string& k) const
 271 {
 272     RenderBufferMap::const_iterator ii = buffers.find(k);
 273     if (ii == buffers.end())
 274         return 0;
 275     return ii->second.texture.get();
 276 }
 277
 278 int CameraInfo::getMainSlaveIndex() const
 279 {
 280     return cameras.find( MAIN_CAMERA )->second.slaveIndex;
 281 }
 282
 283 void CameraInfo::setMatrices(osg::Camera* c)
 284 {
 285     view->set( c->getViewMatrix() );
 286     osg::Matrixd vi = c->getInverseViewMatrix();
 287     viewInverse->set( vi );
 288     projInverse->set( osg::Matrix::inverse( c->getProjectionMatrix() ) );
 289     osg::Vec4d pos = osg::Vec4d(0., 0., 0., 1.) * vi;
 290     worldPosCart->set( osg::Vec3f( pos.x(), pos.y(), pos.z() ) );
 291     SGGeod pos2 = SGGeod::fromCart( SGVec3d( pos.x(), pos.y(), pos.z() ) );
 292     worldPosGeod->set( osg::Vec3f( pos2.getLongitudeRad(), pos2.getLatitudeRad(), pos2.getElevationM() ) );
 293 }
 294
 295 void CameraGroup::update(const osg::Vec3d& position,
 296                          const osg::Quat& orientation)
 297 {
 298     const Matrix masterView(osg::Matrix::translate(-position)
 299                             * osg::Matrix::rotate(orientation.inverse()));
 300     _viewer->getCamera()->setViewMatrix(masterView);
 301     const Matrix& masterProj = _viewer->getCamera()->getProjectionMatrix();
 302     double masterZoomFactor = zoomFactor();
 303     for (CameraList::iterator i = _cameras.begin(); i != _cameras.end(); ++i) {
 304         const CameraInfo* info = i->get();
 305
 306         Camera* camera = info->getCamera(MAIN_CAMERA);
 307         if ( camera ) {
 308             const View::Slave& slave = _viewer->getSlave(info->getMainSlaveIndex());
 309 #if SG_OSG_VERSION_LESS_THAN(3,0,0)
 310             // refreshes camera viewports (for now)
 311             info->updateCameras();
 312 #endif
 313             Matrix viewMatrix;
 314             if (info->flags & GUI) {
 315                 viewMatrix = osg::Matrix(); // identifty transform on the GUI camera
 316             } else if ((info->flags & VIEW_ABSOLUTE) != 0)
 317                 viewMatrix = slave._viewOffset;
 318             else
 319                 viewMatrix = masterView * slave._viewOffset;
 320             camera->setViewMatrix(viewMatrix);
 321             Matrix projectionMatrix;
 322             if (info->flags & GUI) {
 323                 projectionMatrix = osg::Matrix::ortho2D(0, info->width, 0, info->height);
 324             } else if ((info->flags & PROJECTION_ABSOLUTE) != 0) {
 325                 if (info->flags & ENABLE_MASTER_ZOOM) {
 326                     if (info->relativeCameraParent < _cameras.size()) {
 327                         // template projection matrix and view matrix of the current camera
 328                         osg::Matrix P0 = slave._projectionOffset;
 329                         osg::Matrix R = viewMatrix;
 330
 331                         // The already known projection and view matrix of the parent camera
 332                         const CameraInfo* parentInfo = _cameras[info->relativeCameraParent].get();
 333                         RenderStageInfo prsi = parentInfo->cameras.find(MAIN_CAMERA)->second;
 334                         osg::Matrix pP = prsi.camera->getProjectionMatrix();
 335                         osg::Matrix pR = prsi.camera->getViewMatrix();
 336
 337                         // And the projection matrix derived from P0 so that the reference points match
 338                         projectionMatrix = relativeProjection(P0, R, info->thisReference,
 339                                                               pP, pR, info->parentReference);
 340
 341                     } else {
 342                         // We want to zoom, so take the original matrix and apply the zoom to it.
 343                         projectionMatrix = slave._projectionOffset;
 344                         projectionMatrix.postMultScale(osg::Vec3d(masterZoomFactor, masterZoomFactor, 1));
 345                     }
 346                 } else {
 347                     projectionMatrix = slave._projectionOffset;
 348                 }
 349             } else {
 350                 projectionMatrix = masterProj * slave._projectionOffset;
 351             }
 352
 353             CameraMap::const_iterator ii = info->cameras.find(FAR_CAMERA);
 354             if (ii == info->cameras.end() || !ii->second.camera.valid()) {
 355                 camera->setProjectionMatrix(projectionMatrix);
 356             } else {
 357                 Camera* farCamera = ii->second.camera;
 358                 farCamera->setViewMatrix(viewMatrix);
 359                 double left, right, bottom, top, parentNear, parentFar;
 360                 projectionMatrix.getFrustum(left, right, bottom, top,
 361                                             parentNear, parentFar);
 362                 if ((info->flags & FIXED_NEAR_FAR) == 0) {
 363                     parentNear = _zNear;
 364                     parentFar = _zFar;
 365                 }
 366                 if (parentFar < _nearField || _nearField == 0.0f) {
 367                     camera->setProjectionMatrix(projectionMatrix);
 368                     camera->setCullMask(camera->getCullMask()
 369                                         | simgear::BACKGROUND_BIT);
 370                     camera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
 371                     farCamera->setNodeMask(0);
 372                 } else {
 373                     Matrix nearProj, farProj;
 374                     makeNewProjMat(projectionMatrix, parentNear, _nearField,
 375                                    nearProj);
 376                     makeNewProjMat(projectionMatrix, _nearField, parentFar,
 377                                    farProj);
 378                     camera->setProjectionMatrix(nearProj);
 379                     camera->setCullMask(camera->getCullMask()
 380                                         & ~simgear::BACKGROUND_BIT);
 381                     camera->setClearMask(GL_DEPTH_BUFFER_BIT);
 382                     farCamera->setProjectionMatrix(farProj);
 383                     farCamera->setNodeMask(camera->getNodeMask());
 384                 }
 385             }
 386         } else {
 387             bool viewDone = false;
 388             Matrix viewMatrix;
 389             bool projectionDone = false;
 390             Matrix projectionMatrix;
 391             for ( CameraMap::const_iterator ii = info->cameras.begin(); ii != info->cameras.end(); ++ii ) {
 392                 if ( ii->first == SHADOW_CAMERA ) {
 393                     globals->get_renderer()->updateShadowCamera(info, position);
 394                     continue;
 395                 }
 396                 if ( ii->second.fullscreen )
 397                     continue;
 398
 399                 Camera* camera = ii->second.camera.get();
 400                 int slaveIndex = ii->second.slaveIndex;
 401                 const View::Slave& slave = _viewer->getSlave(slaveIndex);
 402
 403                 if ( !viewDone ) {
 404                     if ((info->flags & VIEW_ABSOLUTE) != 0)
 405                         viewMatrix = slave._viewOffset;
 406                     else
 407                         viewMatrix = masterView * slave._viewOffset;
 408                     viewDone = true;
 409                 }
 410
 411                 camera->setViewMatrix( viewMatrix );
 412
 413                 if ( !projectionDone ) {
 414                     if ((info->flags & PROJECTION_ABSOLUTE) != 0) {
 415                         if (info->flags & ENABLE_MASTER_ZOOM) {
 416                             if (info->relativeCameraParent < _cameras.size()) {
 417                                 // template projection matrix and view matrix of the current camera
 418                                 osg::Matrix P0 = slave._projectionOffset;
 419                                 osg::Matrix R = viewMatrix;
 420
 421                                 // The already known projection and view matrix of the parent camera
 422                                 const CameraInfo* parentInfo = _cameras[info->relativeCameraParent].get();
 423                                 RenderStageInfo prsi = parentInfo->cameras.find(MAIN_CAMERA)->second;
 424                                 osg::Matrix pP = prsi.camera->getProjectionMatrix();
 425                                 osg::Matrix pR = prsi.camera->getViewMatrix();
 426
 427                                 // And the projection matrix derived from P0 so that the reference points match
 428                                 projectionMatrix = relativeProjection(P0, R, info->thisReference,
 429                                                                       pP, pR, info->parentReference);
 430
 431                             } else {
 432                                 // We want to zoom, so take the original matrix and apply the zoom to it.
 433                                 projectionMatrix = slave._projectionOffset;
 434                                 projectionMatrix.postMultScale(osg::Vec3d(masterZoomFactor, masterZoomFactor, 1));
 435                             }
 436                         } else {
 437                             projectionMatrix = slave._projectionOffset;
 438                         }
 439                     } else {
 440                         projectionMatrix = masterProj * slave._projectionOffset;
 441                     }
 442                     projectionDone = true;
 443                 }
 444
 445                 camera->setProjectionMatrix(projectionMatrix);
 446             }
 447         }
 448     }
 449
 450     globals->get_renderer()->setPlanes( _zNear, _zFar );
 451 }
 452
 453 void CameraGroup::setCameraParameters(float vfov, float aspectRatio)
 454 {
 455     if (vfov != 0.0f && aspectRatio != 0.0f)
 456         _viewer->getCamera()
 457             ->setProjectionMatrixAsPerspective(vfov,
 458                                                1.0f / aspectRatio,
 459                                                _zNear, _zFar);
 460 }
 461
 462 double CameraGroup::getMasterAspectRatio() const
 463 {
 464     if (_cameras.empty())
 465         return 0.0;
 466
 467     const CameraInfo* info = _cameras.front();
 468
 469     osg::Camera* camera = info->getCamera(MAIN_CAMERA);
 470     if ( !camera )
 471         camera = info->getCamera( GEOMETRY_CAMERA );
 472     const osg::Viewport* viewport = camera->getViewport();
 473     if (!viewport) {
 474         return 0.0;
 475     }
 476
 477     return static_cast<double>(viewport->height()) / viewport->width();
 478 }
 479
 480 }
 481
 482 namespace
 483 {
 484 // A raw value for property nodes that references a class member via
 485 // an osg::ref_ptr.
 486 template<class C, class T>
 487 class RefMember : public SGRawValue<T>
 488 {
 489 public:
 490     RefMember (C *obj, T C::*ptr)
 491         : _obj(obj), _ptr(ptr) {}
 492     virtual ~RefMember () {}
 493     virtual T getValue () const
 494     {
 495         return _obj.get()->*_ptr;
 496     }
 497     virtual bool setValue (T value)
 498     {
 499         _obj.get()->*_ptr = value;
 500         return true;
 501     }
 502     virtual SGRawValue<T> * clone () const
 503     {
 504         return new RefMember(_obj.get(), _ptr);
 505     }
 506 private:
 507     ref_ptr<C> _obj;
 508     T C::* const _ptr;
 509 };
 510
 511 template<typename C, typename T>
 512 RefMember<C, T> makeRefMember(C *obj, T C::*ptr)
 513 {
 514     return RefMember<C, T>(obj, ptr);
 515 }
 516
 517 template<typename C, typename T>
 518 void bindMemberToNode(SGPropertyNode* parent, const char* childName,
 519                       C* obj, T C::*ptr, T value)
 520 {
 521     SGPropertyNode* valNode = parent->getNode(childName);
 522     RefMember<C, T> refMember = makeRefMember(obj, ptr);
 523     if (!valNode) {
 524         valNode = parent->getNode(childName, true);
 525         valNode->tie(refMember, false);
 526         setValue(valNode, value);
 527     } else {
 528         valNode->tie(refMember, true);
 529     }
 530 }
 531
 532 void buildViewport(flightgear::CameraInfo* info, SGPropertyNode* viewportNode,
 533                    const osg::GraphicsContext::Traits *traits)
 534 {
 535     using namespace flightgear;
 536     bindMemberToNode(viewportNode, "x", info, &CameraInfo::x, 0.0);
 537     bindMemberToNode(viewportNode, "y", info, &CameraInfo::y, 0.0);
 538     bindMemberToNode(viewportNode, "width", info, &CameraInfo::width,
 539                      static_cast<double>(traits->width));
 540     bindMemberToNode(viewportNode, "height", info, &CameraInfo::height,
 541                      static_cast<double>(traits->height));
 542 }
 543 }
 544
 545 namespace flightgear
 546 {
 547
 548 // Mostly copied from osg's osgViewer/View.cpp
 549
 550 static osg::Geometry* createPanoramicSphericalDisplayDistortionMesh(
 551     const Vec3& origin, const Vec3& widthVector, const Vec3& heightVector,
 552     double sphere_radius, double collar_radius,
 553     Image* intensityMap = 0, const Matrix& projectorMatrix = Matrix())
 554 {
 555     osg::Vec3d center(0.0,0.0,0.0);
 556     osg::Vec3d eye(0.0,0.0,0.0);
 557
 558     double distance = sqrt(sphere_radius*sphere_radius - collar_radius*collar_radius);
 559     bool flip = false;
 560     bool texcoord_flip = false;
 561
 562 #if 0
 563     osg::Vec3d projector = eye - osg::Vec3d(0.0,0.0, distance);
 564
 565     OSG_INFO<<"createPanoramicSphericalDisplayDistortionMesh : Projector position = "<<projector<<std::endl;
 566     OSG_INFO<<"createPanoramicSphericalDisplayDistortionMesh : distance = "<<distance<<std::endl;
 567 #endif
 568     // create the quad to visualize.
 569     osg::Geometry* geometry = new osg::Geometry();
 570
 571     geometry->setSupportsDisplayList(false);
 572
 573     osg::Vec3 xAxis(widthVector);
 574     float width = widthVector.length();
 575     xAxis /= width;
 576
 577     osg::Vec3 yAxis(heightVector);
 578     float height = heightVector.length();
 579     yAxis /= height;
 580
 581     int noSteps = 160;
 582
 583     osg::Vec3Array* vertices = new osg::Vec3Array;
 584     osg::Vec2Array* texcoords0 = new osg::Vec2Array;
 585     osg::Vec2Array* texcoords1 = intensityMap==0 ? new osg::Vec2Array : 0;
 586     osg::Vec4Array* colors = new osg::Vec4Array;
 587
 588 #if 0
 589     osg::Vec3 bottom = origin;
 590     osg::Vec3 dx = xAxis*(width/((float)(noSteps-2)));
 591     osg::Vec3 dy = yAxis*(height/((float)(noSteps-1)));
 592 #endif
 593     osg::Vec3 top = origin + yAxis*height;
 594
 595     osg::Vec3 screenCenter = origin + widthVector*0.5f + heightVector*0.5f;
 596     float screenRadius = heightVector.length() * 0.5f;
 597
 598     geometry->getOrCreateStateSet()->setMode(GL_CULL_FACE, osg::StateAttribute::OFF | osg::StateAttribute::PROTECTED);
 599
 600     for(int i=0;i<noSteps;++i)
 601     {
 602         //osg::Vec3 cursor = bottom+dy*(float)i;
 603         for(int j=0;j<noSteps;++j)
 604         {
 605             osg::Vec2 texcoord(double(i)/double(noSteps-1), double(j)/double(noSteps-1));
 606             double theta = texcoord.x() * 2.0 * osg::PI;
 607             double phi = (1.0-texcoord.y()) * osg::PI;
 608
 609             if (texcoord_flip) texcoord.y() = 1.0f - texcoord.y();
 610
 611             osg::Vec3 pos(sin(phi)*sin(theta), sin(phi)*cos(theta), cos(phi));
 612             pos = pos*projectorMatrix;
 613
 614             double alpha = atan2(pos.x(), pos.y());
 615             if (alpha<0.0) alpha += 2.0*osg::PI;
 616
 617             double beta = atan2(sqrt(pos.x()*pos.x() + pos.y()*pos.y()), pos.z());
 618             if (beta<0.0) beta += 2.0*osg::PI;
 619
 620             double gamma = atan2(sqrt(double(pos.x()*pos.x() + pos.y()*pos.y())), double(pos.z()+distance));
 621             if (gamma<0.0) gamma += 2.0*osg::PI;
 622
 623
 624             osg::Vec3 v = screenCenter + osg::Vec3(sin(alpha)*gamma*2.0/osg::PI, -cos(alpha)*gamma*2.0/osg::PI, 0.0f)*screenRadius;
 625
 626             if (flip)
 627                 vertices->push_back(osg::Vec3(v.x(), top.y()-(v.y()-origin.y()),v.z()));
 628             else
 629                 vertices->push_back(v);
 630
 631             texcoords0->push_back( texcoord );
 632
 633             osg::Vec2 texcoord1(alpha/(2.0*osg::PI), 1.0f - beta/osg::PI);
 634             if (intensityMap)
 635             {
 636                 colors->push_back(intensityMap->getColor(texcoord1));
 637             }
 638             else
 639             {
 640                 colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
 641                 if (texcoords1) texcoords1->push_back( texcoord1 );
 642             }
 643
 644
 645         }
 646     }
 647
 648
 649     // pass the created vertex array to the points geometry object.
 650     geometry->setVertexArray(vertices);
 651
 652     geometry->setColorArray(colors);
 653     geometry->setColorBinding(osg::Geometry::BIND_PER_VERTEX);
 654
 655     geometry->setTexCoordArray(0,texcoords0);
 656     if (texcoords1) geometry->setTexCoordArray(1,texcoords1);
 657
 658     osg::DrawElementsUShort* elements = new osg::DrawElementsUShort(osg::PrimitiveSet::TRIANGLES);
 659     geometry->addPrimitiveSet(elements);
 660
 661     for(int i=0;i<noSteps-1;++i)
 662     {
 663         for(int j=0;j<noSteps-1;++j)
 664         {
 665             int i1 = j+(i+1)*noSteps;
 666             int i2 = j+(i)*noSteps;
 667             int i3 = j+1+(i)*noSteps;
 668             int i4 = j+1+(i+1)*noSteps;
 669
 670             osg::Vec3& v1 = (*vertices)[i1];
 671             osg::Vec3& v2 = (*vertices)[i2];
 672             osg::Vec3& v3 = (*vertices)[i3];
 673             osg::Vec3& v4 = (*vertices)[i4];
 674
 675             if ((v1-screenCenter).length()>screenRadius) continue;
 676             if ((v2-screenCenter).length()>screenRadius) continue;
 677             if ((v3-screenCenter).length()>screenRadius) continue;
 678             if ((v4-screenCenter).length()>screenRadius) continue;
 679
 680             elements->push_back(i1);
 681             elements->push_back(i2);
 682             elements->push_back(i3);
 683
 684             elements->push_back(i1);
 685             elements->push_back(i3);
 686             elements->push_back(i4);
 687         }
 688     }
 689
 690     return geometry;
 691 }
 692
 693 void CameraGroup::buildDistortionCamera(const SGPropertyNode* psNode,
 694                                         Camera* camera)
 695 {
 696     const SGPropertyNode* texNode = psNode->getNode("texture");
 697     if (!texNode) {
 698         // error
 699         return;
 700     }
 701     string texName = texNode->getStringValue();
 702     TextureMap::iterator itr = _textureTargets.find(texName);
 703     if (itr == _textureTargets.end()) {
 704         // error
 705         return;
 706     }
 707     Viewport* viewport = camera->getViewport();
 708     float width = viewport->width();
 709     float height = viewport->height();
 710     TextureRectangle* texRect = itr->second.get();
 711     double radius = psNode->getDoubleValue("radius", 1.0);
 712     double collar = psNode->getDoubleValue("collar", 0.45);
 713     Geode* geode = new Geode();
 714     geode->addDrawable(createPanoramicSphericalDisplayDistortionMesh(
 715                            Vec3(0.0f,0.0f,0.0f), Vec3(width,0.0f,0.0f),
 716                            Vec3(0.0f,height,0.0f), radius, collar));
 717
 718     // new we need to add the texture to the mesh, we do so by creating a
 719     // StateSet to contain the Texture StateAttribute.
 720     StateSet* stateset = geode->getOrCreateStateSet();
 721     stateset->setTextureAttributeAndModes(0, texRect, StateAttribute::ON);
 722     stateset->setMode(GL_LIGHTING, StateAttribute::OFF);
 723
 724     TexMat* texmat = new TexMat;
 725     texmat->setScaleByTextureRectangleSize(true);
 726     stateset->setTextureAttributeAndModes(0, texmat, osg::StateAttribute::ON);
 727 #if 0
 728     if (!applyIntensityMapAsColours && intensityMap)
 729     {
 730         stateset->setTextureAttributeAndModes(1, new osg::Texture2D(intensityMap), osg::StateAttribute::ON);
 731     }
 732 #endif
 733     // add subgraph to render
 734     camera->addChild(geode);
 735     camera->setClearMask(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
 736     camera->setClearColor(osg::Vec4(0.0, 0.0, 0.0, 1.0));
 737     camera->setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR);
 738     camera->setCullingMode(osg::CullSettings::NO_CULLING);
 739     camera->setName("DistortionCorrectionCamera");
 740 }
 741
 742 CameraInfo* CameraGroup::buildCamera(SGPropertyNode* cameraNode)
 743 {
 744     WindowBuilder *wBuild = WindowBuilder::getWindowBuilder();
 745     const SGPropertyNode* windowNode = cameraNode->getNode("window");
 746     GraphicsWindow* window = 0;
 747     int cameraFlags = DO_INTERSECTION_TEST;
 748     if (windowNode) {
 749         // New style window declaration / definition
 750         window = wBuild->buildWindow(windowNode);
 751     } else {
 752         // Old style: suck window params out of camera block
 753         window = wBuild->buildWindow(cameraNode);
 754     }
 755     if (!window) {
 756         return 0;
 757     }
 758     Camera* camera = new Camera;
 759     camera->setName("windowCamera");
 760     camera->setAllowEventFocus(false);
 761     camera->setGraphicsContext(window->gc.get());
 762     camera->setViewport(new Viewport);
 763     camera->setCullingMode(CullSettings::SMALL_FEATURE_CULLING
 764                            | CullSettings::VIEW_FRUSTUM_CULLING);
 765     camera->setInheritanceMask(CullSettings::ALL_VARIABLES
 766                                & ~(CullSettings::CULL_MASK
 767                                    | CullSettings::CULLING_MODE
 768                                    | CullSettings::CLEAR_MASK
 769                                    ));
 770
 771     osg::Matrix vOff;
 772     const SGPropertyNode* viewNode = cameraNode->getNode("view");
 773     if (viewNode) {
 774         double heading = viewNode->getDoubleValue("heading-deg", 0.0);
 775         double pitch = viewNode->getDoubleValue("pitch-deg", 0.0);
 776         double roll = viewNode->getDoubleValue("roll-deg", 0.0);
 777         double x = viewNode->getDoubleValue("x", 0.0);
 778         double y = viewNode->getDoubleValue("y", 0.0);
 779         double z = viewNode->getDoubleValue("z", 0.0);
 780         // Build a view matrix, which is the inverse of a model
 781         // orientation matrix.
 782         vOff = (Matrix::translate(-x, -y, -z)
 783                 * Matrix::rotate(-DegreesToRadians(heading),
 784                                  Vec3d(0.0, 1.0, 0.0),
 785                                  -DegreesToRadians(pitch),
 786                                  Vec3d(1.0, 0.0, 0.0),
 787                                  -DegreesToRadians(roll),
 788                                  Vec3d(0.0, 0.0, 1.0)));
 789         if (viewNode->getBoolValue("absolute", false))
 790             cameraFlags |= VIEW_ABSOLUTE;
 791     } else {
 792         // Old heading parameter, works in the opposite direction
 793         double heading = cameraNode->getDoubleValue("heading-deg", 0.0);
 794         vOff.makeRotate(DegreesToRadians(heading), osg::Vec3(0, 1, 0));
 795     }
 796     // Configuring the physical dimensions of a monitor
 797     SGPropertyNode* viewportNode = cameraNode->getNode("viewport", true);
 798     double physicalWidth = viewportNode->getDoubleValue("width", 1024);
 799     double physicalHeight = viewportNode->getDoubleValue("height", 768);
 800     double bezelHeightTop = 0;
 801     double bezelHeightBottom = 0;
 802     double bezelWidthLeft = 0;
 803     double bezelWidthRight = 0;
 804     const SGPropertyNode* physicalDimensionsNode = 0;
 805     if ((physicalDimensionsNode = cameraNode->getNode("physical-dimensions")) != 0) {
 806         physicalWidth = physicalDimensionsNode->getDoubleValue("width", physicalWidth);
 807         physicalHeight = physicalDimensionsNode->getDoubleValue("height", physicalHeight);
 808         const SGPropertyNode* bezelNode = 0;
 809         if ((bezelNode = physicalDimensionsNode->getNode("bezel")) != 0) {
 810             bezelHeightTop = bezelNode->getDoubleValue("top", bezelHeightTop);
 811             bezelHeightBottom = bezelNode->getDoubleValue("bottom", bezelHeightBottom);
 812             bezelWidthLeft = bezelNode->getDoubleValue("left", bezelWidthLeft);
 813             bezelWidthRight = bezelNode->getDoubleValue("right", bezelWidthRight);
 814         }
 815     }
 816     osg::Matrix pOff;
 817     unsigned parentCameraIndex = ~0u;
 818     osg::Vec2d parentReference[2];
 819     osg::Vec2d thisReference[2];
 820     SGPropertyNode* projectionNode = 0;
 821     if ((projectionNode = cameraNode->getNode("perspective")) != 0) {
 822         double fovy = projectionNode->getDoubleValue("fovy-deg", 55.0);
 823         double aspectRatio = projectionNode->getDoubleValue("aspect-ratio",
 824                                                             1.0);
 825         double zNear = projectionNode->getDoubleValue("near", 0.0);
 826         double zFar = projectionNode->getDoubleValue("far", zNear + 20000);
 827         double offsetX = projectionNode->getDoubleValue("offset-x", 0.0);
 828         double offsetY = projectionNode->getDoubleValue("offset-y", 0.0);
 829         double tan_fovy = tan(DegreesToRadians(fovy*0.5));
 830         double right = tan_fovy * aspectRatio * zNear + offsetX;
 831         double left = -tan_fovy * aspectRatio * zNear + offsetX;
 832         double top = tan_fovy * zNear + offsetY;
 833         double bottom = -tan_fovy * zNear + offsetY;
 834         pOff.makeFrustum(left, right, bottom, top, zNear, zFar);
 835         cameraFlags |= PROJECTION_ABSOLUTE;
 836         if (projectionNode->getBoolValue("fixed-near-far", true))
 837             cameraFlags |= FIXED_NEAR_FAR;
 838     } else if ((projectionNode = cameraNode->getNode("frustum")) != 0
 839                || (projectionNode = cameraNode->getNode("ortho")) != 0) {
 840         double top = projectionNode->getDoubleValue("top", 0.0);
 841         double bottom = projectionNode->getDoubleValue("bottom", 0.0);
 842         double left = projectionNode->getDoubleValue("left", 0.0);
 843         double right = projectionNode->getDoubleValue("right", 0.0);
 844         double zNear = projectionNode->getDoubleValue("near", 0.0);
 845         double zFar = projectionNode->getDoubleValue("far", zNear + 20000);
 846         if (cameraNode->getNode("frustum")) {
 847             pOff.makeFrustum(left, right, bottom, top, zNear, zFar);
 848             cameraFlags |= PROJECTION_ABSOLUTE;
 849         } else {
 850             pOff.makeOrtho(left, right, bottom, top, zNear, zFar);
 851             cameraFlags |= (PROJECTION_ABSOLUTE | ORTHO);
 852         }
 853         if (projectionNode->getBoolValue("fixed-near-far", true))
 854             cameraFlags |= FIXED_NEAR_FAR;
 855     } else if ((projectionNode = cameraNode->getNode("master-perspective")) != 0) {
 856         double zNear = projectionNode->getDoubleValue("eye-distance", 0.4*physicalWidth);
 857         double xoff = projectionNode->getDoubleValue("x-offset", 0);
 858         double yoff = projectionNode->getDoubleValue("y-offset", 0);
 859         double left = -0.5*physicalWidth - xoff;
 860         double right = 0.5*physicalWidth - xoff;
 861         double bottom = -0.5*physicalHeight - yoff;
 862         double top = 0.5*physicalHeight - yoff;
 863         pOff.makeFrustum(left, right, bottom, top, zNear, zNear*1000);
 864         cameraFlags |= PROJECTION_ABSOLUTE | ENABLE_MASTER_ZOOM;
 865     } else if ((projectionNode = cameraNode->getNode("right-of-perspective"))
 866                || (projectionNode = cameraNode->getNode("left-of-perspective"))
 867                || (projectionNode = cameraNode->getNode("above-perspective"))
 868                || (projectionNode = cameraNode->getNode("below-perspective"))
 869                || (projectionNode = cameraNode->getNode("reference-points-perspective"))) {
 870         std::string name = projectionNode->getStringValue("parent-camera");
 871         for (unsigned i = 0; i < _cameras.size(); ++i) {
 872             if (_cameras[i]->name != name)
 873                 continue;
 874             parentCameraIndex = i;
 875         }
 876         if (_cameras.size() <= parentCameraIndex) {
 877             SG_LOG(SG_VIEW, SG_ALERT, "CameraGroup::buildCamera: "
 878                    "failed to find parent camera for relative camera!");
 879             return 0;
 880         }
 881         const CameraInfo* parentInfo = _cameras[parentCameraIndex].get();
 882         if (projectionNode->getNameString() == "right-of-perspective") {
 883             double tmp = (parentInfo->physicalWidth + 2*parentInfo->bezelWidthRight)/parentInfo->physicalWidth;
 884             parentReference[0] = osg::Vec2d(tmp, -1);
 885             parentReference[1] = osg::Vec2d(tmp, 1);
 886             tmp = (physicalWidth + 2*bezelWidthLeft)/physicalWidth;
 887             thisReference[0] = osg::Vec2d(-tmp, -1);
 888             thisReference[1] = osg::Vec2d(-tmp, 1);
 889         } else if (projectionNode->getNameString() == "left-of-perspective") {
 890             double tmp = (parentInfo->physicalWidth + 2*parentInfo->bezelWidthLeft)/parentInfo->physicalWidth;
 891             parentReference[0] = osg::Vec2d(-tmp, -1);
 892             parentReference[1] = osg::Vec2d(-tmp, 1);
 893             tmp = (physicalWidth + 2*bezelWidthRight)/physicalWidth;
 894             thisReference[0] = osg::Vec2d(tmp, -1);
 895             thisReference[1] = osg::Vec2d(tmp, 1);
 896         } else if (projectionNode->getNameString() == "above-perspective") {
 897             double tmp = (parentInfo->physicalHeight + 2*parentInfo->bezelHeightTop)/parentInfo->physicalHeight;
 898             parentReference[0] = osg::Vec2d(-1, tmp);
 899             parentReference[1] = osg::Vec2d(1, tmp);
 900             tmp = (physicalHeight + 2*bezelHeightBottom)/physicalHeight;
 901             thisReference[0] = osg::Vec2d(-1, -tmp);
 902             thisReference[1] = osg::Vec2d(1, -tmp);
 903         } else if (projectionNode->getNameString() == "below-perspective") {
 904             double tmp = (parentInfo->physicalHeight + 2*parentInfo->bezelHeightBottom)/parentInfo->physicalHeight;
 905             parentReference[0] = osg::Vec2d(-1, -tmp);
 906             parentReference[1] = osg::Vec2d(1, -tmp);
 907             tmp = (physicalHeight + 2*bezelHeightTop)/physicalHeight;
 908             thisReference[0] = osg::Vec2d(-1, tmp);
 909             thisReference[1] = osg::Vec2d(1, tmp);
 910         } else if (projectionNode->getNameString() == "reference-points-perspective") {
 911             SGPropertyNode* parentNode = projectionNode->getNode("parent", true);
 912             SGPropertyNode* thisNode = projectionNode->getNode("this", true);
 913             SGPropertyNode* pointNode;
 914
 915             pointNode = parentNode->getNode("point", 0, true);
 916             parentReference[0][0] = pointNode->getDoubleValue("x", 0)*2/parentInfo->physicalWidth;
 917             parentReference[0][1] = pointNode->getDoubleValue("y", 0)*2/parentInfo->physicalHeight;
 918             pointNode = parentNode->getNode("point", 1, true);
 919             parentReference[1][0] = pointNode->getDoubleValue("x", 0)*2/parentInfo->physicalWidth;
 920             parentReference[1][1] = pointNode->getDoubleValue("y", 0)*2/parentInfo->physicalHeight;
 921
 922             pointNode = thisNode->getNode("point", 0, true);
 923             thisReference[0][0] = pointNode->getDoubleValue("x", 0)*2/physicalWidth;
 924             thisReference[0][1] = pointNode->getDoubleValue("y", 0)*2/physicalHeight;
 925             pointNode = thisNode->getNode("point", 1, true);
 926             thisReference[1][0] = pointNode->getDoubleValue("x", 0)*2/physicalWidth;
 927             thisReference[1][1] = pointNode->getDoubleValue("y", 0)*2/physicalHeight;
 928         }
 929
 930         pOff = osg::Matrix::perspective(45, physicalWidth/physicalHeight, 1, 20000);
 931         cameraFlags |= PROJECTION_ABSOLUTE | ENABLE_MASTER_ZOOM;
 932     } else {
 933         // old style shear parameters
 934         double shearx = cameraNode->getDoubleValue("shear-x", 0);
 935         double sheary = cameraNode->getDoubleValue("shear-y", 0);
 936         pOff.makeTranslate(-shearx, -sheary, 0);
 937     }
 938     const SGPropertyNode* textureNode = cameraNode->getNode("texture");
 939     if (textureNode) {
 940         string texName = textureNode->getStringValue("name");
 941         int tex_width = textureNode->getIntValue("width");
 942         int tex_height = textureNode->getIntValue("height");
 943         TextureRectangle* texture = new TextureRectangle;
 944
 945         texture->setTextureSize(tex_width, tex_height);
 946         texture->setInternalFormat(GL_RGB);
 947         texture->setFilter(Texture::MIN_FILTER, Texture::LINEAR);
 948         texture->setFilter(Texture::MAG_FILTER, Texture::LINEAR);
 949         texture->setWrap(Texture::WRAP_S, Texture::CLAMP_TO_EDGE);
 950         texture->setWrap(Texture::WRAP_T, Texture::CLAMP_TO_EDGE);
 951         camera->setDrawBuffer(GL_FRONT);
 952         camera->setReadBuffer(GL_FRONT);
 953         camera->setRenderTargetImplementation(Camera::FRAME_BUFFER_OBJECT);
 954         camera->attach(Camera::COLOR_BUFFER, texture);
 955         _textureTargets[texName] = texture;
 956     } else {
 957         camera->setDrawBuffer(GL_BACK);
 958         camera->setReadBuffer(GL_BACK);
 959     }
 960     const SGPropertyNode* psNode = cameraNode->getNode("panoramic-spherical");
 961     bool useMasterSceneGraph = !psNode;
 962     CameraInfo* info = globals->get_renderer()->buildRenderingPipeline(this, cameraFlags, camera, vOff, pOff,
 963                                                                         window->gc.get(), useMasterSceneGraph);
 964     info->name = cameraNode->getStringValue("name");
 965     info->physicalWidth = physicalWidth;
 966     info->physicalHeight = physicalHeight;
 967     info->bezelHeightTop = bezelHeightTop;
 968     info->bezelHeightBottom = bezelHeightBottom;
 969     info->bezelWidthLeft = bezelWidthLeft;
 970     info->bezelWidthRight = bezelWidthRight;
 971     info->relativeCameraParent = parentCameraIndex;
 972     info->parentReference[0] = parentReference[0];
 973     info->parentReference[1] = parentReference[1];
 974     info->thisReference[0] = thisReference[0];
 975     info->thisReference[1] = thisReference[1];
 976     // If a viewport isn't set on the camera, then it's hard to dig it
 977     // out of the SceneView objects in the viewer, and the coordinates
 978     // of mouse events are somewhat bizzare.
 979     buildViewport(info, viewportNode, window->gc->getTraits());
 980     info->updateCameras();
 981     // Distortion camera needs the viewport which is created by addCamera().
 982     if (psNode) {
 983         info->flags = info->flags | VIEW_ABSOLUTE;
 984         buildDistortionCamera(psNode, camera);
 985     }
 986     return info;
 987 }
 988
 989 CameraInfo* CameraGroup::buildGUICamera(SGPropertyNode* cameraNode,
 990                                         GraphicsWindow* window)
 991 {
 992     WindowBuilder *wBuild = WindowBuilder::getWindowBuilder();
 993     const SGPropertyNode* windowNode = (cameraNode
 994                                         ? cameraNode->getNode("window")
 995                                         : 0);
 996     if (!window && windowNode) {
 997       // New style window declaration / definition
 998       window = wBuild->buildWindow(windowNode);
 999     }
1000
1001     if (!window) { // buildWindow can fail
1002       SG_LOG(SG_VIEW, SG_WARN, "CameraGroup::buildGUICamera: failed to build a window");
1003       return NULL;
1004     }
1005
1006     Camera* camera = new Camera;
1007     camera->setName( "GUICamera" );
1008     camera->setAllowEventFocus(false);
1009     camera->setGraphicsContext(window->gc.get());
1010     camera->setViewport(new Viewport);
1011     camera->setClearMask(0);
1012     camera->setInheritanceMask(CullSettings::ALL_VARIABLES
1013                                & ~(CullSettings::COMPUTE_NEAR_FAR_MODE
1014                                    | CullSettings::CULLING_MODE
1015                                    | CullSettings::CLEAR_MASK
1016                                    ));
1017     camera->setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR);
1018     camera->setCullingMode(osg::CullSettings::NO_CULLING);
1019     camera->setProjectionResizePolicy(Camera::FIXED);
1020     camera->setReferenceFrame(Transform::ABSOLUTE_RF);
1021     const int cameraFlags = GUI | DO_INTERSECTION_TEST;
1022
1023     CameraInfo* result = new CameraInfo(cameraFlags);
1024     result->name = "GUI camera";
1025     // The camera group will always update the camera
1026     camera->setReferenceFrame(Transform::ABSOLUTE_RF);
1027
1028     getViewer()->addSlave(camera, Matrixd::identity(), Matrixd::identity(), false);
1029     //installCullVisitor(camera);
1030     int slaveIndex = getViewer()->getNumSlaves() - 1;
1031     result->addCamera( MAIN_CAMERA, camera, slaveIndex );
1032     camera->setRenderOrder(Camera::POST_RENDER, slaveIndex);
1033     addCamera(result);
1034
1035     // XXX Camera needs to be drawn last; eventually the render order
1036     // should be assigned by a camera manager.
1037     camera->setRenderOrder(osg::Camera::POST_RENDER, 10000);
1038     SGPropertyNode* viewportNode = cameraNode->getNode("viewport", true);
1039     buildViewport(result, viewportNode, window->gc->getTraits());
1040
1041     // Disable statistics for the GUI camera.
1042     camera->setStats(0);
1043     result->updateCameras();
1044     return result;
1045 }
1046
1047 CameraGroup* CameraGroup::buildCameraGroup(osgViewer::Viewer* viewer,
1048                                            SGPropertyNode* gnode)
1049 {
1050     CameraGroup* cgroup = new CameraGroup(viewer);
1051     for (int i = 0; i < gnode->nChildren(); ++i) {
1052         SGPropertyNode* pNode = gnode->getChild(i);
1053         const char* name = pNode->getName();
1054         if (!strcmp(name, "camera")) {
1055             cgroup->buildCamera(pNode);
1056         } else if (!strcmp(name, "window")) {
1057             WindowBuilder::getWindowBuilder()->buildWindow(pNode);
1058         } else if (!strcmp(name, "gui")) {
1059             cgroup->buildGUICamera(pNode);
1060         }
1061     }
1062     bindMemberToNode(gnode, "znear", cgroup, &CameraGroup::_zNear, .1f);
1063     bindMemberToNode(gnode, "zfar", cgroup, &CameraGroup::_zFar, 120000.0f);
1064     bindMemberToNode(gnode, "near-field", cgroup, &CameraGroup::_nearField,
1065                      100.0f);
1066     return cgroup;
1067 }
1068
1069 void CameraGroup::setCameraCullMasks(Node::NodeMask nm)
1070 {
1071     for (CameraIterator i = camerasBegin(), e = camerasEnd(); i != e; ++i) {
1072         CameraInfo* info = i->get();
1073         if (info->flags & GUI)
1074             continue;
1075         osg::ref_ptr<osg::Camera> farCamera = info->getCamera(FAR_CAMERA);
1076         osg::Camera* camera = info->getCamera( MAIN_CAMERA );
1077         if (camera) {
1078             if (farCamera.valid() && farCamera->getNodeMask() != 0) {
1079                 camera->setCullMask(nm & ~simgear::BACKGROUND_BIT);
1080                 camera->setCullMaskLeft(nm & ~simgear::BACKGROUND_BIT);
1081                 camera->setCullMaskRight(nm & ~simgear::BACKGROUND_BIT);
1082                 farCamera->setCullMask(nm);
1083                 farCamera->setCullMaskLeft(nm);
1084                 farCamera->setCullMaskRight(nm);
1085             } else {
1086                 camera->setCullMask(nm);
1087                 camera->setCullMaskLeft(nm);
1088                 camera->setCullMaskRight(nm);
1089             }
1090         } else {
1091             camera = info->getCamera( GEOMETRY_CAMERA );
1092             if (camera == 0) continue;
1093             camera->setCullMask( nm & ~simgear::MODELLIGHT_BIT );
1094
1095             camera = info->getCamera( LIGHTING_CAMERA );
1096             if (camera == 0) continue;
1097             osg::Switch* sw = camera->getChild(0)->asSwitch();
1098             for (unsigned int i = 0; i < sw->getNumChildren(); ++i) {
1099                 osg::Camera* lc = dynamic_cast<osg::Camera*>(sw->getChild(i));
1100                 if (lc == 0) continue;
1101                 string name = lc->getName();
1102                 if (name == "LightCamera") {
1103                     lc->setCullMask( (nm & simgear::LIGHTS_BITS) | (lc->getCullMask() & ~simgear::LIGHTS_BITS) );
1104                 }
1105             }
1106         }
1107     }
1108 }
1109
1110 void CameraGroup::resized()
1111 {
1112     for (CameraIterator i = camerasBegin(), e = camerasEnd(); i != e; ++i) {
1113         CameraInfo *info = i->get();
1114         Camera* camera = info->getCamera( MAIN_CAMERA );
1115         if ( camera == 0 )
1116             camera = info->getCamera( DISPLAY_CAMERA );
1117         const Viewport* viewport = camera->getViewport();
1118         info->x = viewport->x();
1119         info->y = viewport->y();
1120         info->width = viewport->width();
1121         info->height = viewport->height();
1122
1123         info->resized( info->width, info->height );
1124     }
1125 }
1126
1127 const CameraInfo* CameraGroup::getGUICamera() const
1128 {
1129     ConstCameraIterator result
1130         = std::find_if(camerasBegin(), camerasEnd(),
1131                    FlagTester<CameraInfo>(GUI));
1132     if (result == camerasEnd()) {
1133         return NULL;
1134     }
1135
1136     return *result;
1137 }
1138
1139 Camera* getGUICamera(CameraGroup* cgroup)
1140 {
1141     const CameraInfo* info = cgroup->getGUICamera();
1142     if (!info) {
1143         return NULL;
1144     }
1145
1146     return info->getCamera(MAIN_CAMERA);
1147 }
1148
1149
1150 static bool computeCameraIntersection(const CameraInfo* cinfo, const osg::Vec2d& windowPos,
1151                                       osgUtil::LineSegmentIntersector::Intersections& intersections)
1152 {
1153   using osgUtil::Intersector;
1154   using osgUtil::LineSegmentIntersector;
1155
1156   if (!(cinfo->flags & CameraGroup::DO_INTERSECTION_TEST))
1157     return false;
1158
1159   const Camera* camera = cinfo->getCamera(MAIN_CAMERA);
1160   if ( !camera )
1161     camera = cinfo->getCamera( GEOMETRY_CAMERA );
1162
1163   // if (camera->getGraphicsContext() != ea->getGraphicsContext())
1164  //   return false;
1165
1166   const Viewport* viewport = camera->getViewport();
1167   SGRect<double> viewportRect(viewport->x(), viewport->y(),
1168                               viewport->x() + viewport->width() - 1.0,
1169                               viewport->y() + viewport->height()- 1.0);
1170
1171   double epsilon = 0.5;
1172   if (!viewportRect.contains(windowPos.x(), windowPos.y(), epsilon))
1173     return false;
1174
1175   Vec4d start(windowPos.x(), windowPos.y(), 0.0, 1.0);
1176   Vec4d end(windowPos.x(), windowPos.y(), 1.0, 1.0);
1177   Matrix windowMat = viewport->computeWindowMatrix();
1178   Matrix startPtMat = Matrix::inverse(camera->getProjectionMatrix()
1179                                       * windowMat);
1180   Matrix endPtMat;
1181   const Camera* farCamera = cinfo->getCamera( FAR_CAMERA );
1182   if (!farCamera || farCamera->getNodeMask() == 0)
1183     endPtMat = startPtMat;
1184   else
1185     endPtMat = Matrix::inverse(farCamera->getProjectionMatrix()
1186                                * windowMat);
1187   start = start * startPtMat;
1188   start /= start.w();
1189   end = end * endPtMat;
1190   end /= end.w();
1191   ref_ptr<LineSegmentIntersector> picker
1192   = new LineSegmentIntersector(Intersector::VIEW,
1193                                Vec3d(start.x(), start.y(), start.z()),
1194                                Vec3d(end.x(), end.y(), end.z()));
1195   osgUtil::IntersectionVisitor iv(picker.get());
1196   iv.setTraversalMask( simgear::PICK_BIT );
1197
1198   const_cast<Camera*>(camera)->accept(iv);
1199   if (picker->containsIntersections()) {
1200     intersections = picker->getIntersections();
1201     return true;
1202   }
1203
1204   return false;
1205 }
1206
1207 bool computeIntersections(const CameraGroup* cgroup,
1208                           const osg::Vec2d& windowPos,
1209                           osgUtil::LineSegmentIntersector::Intersections& intersections)
1210 {
1211     // test the GUI first
1212     const CameraInfo* guiCamera = cgroup->getGUICamera();
1213     if (guiCamera && computeCameraIntersection(guiCamera, windowPos, intersections))
1214         return true;
1215
1216     // Find camera that contains event
1217     for (CameraGroup::ConstCameraIterator iter = cgroup->camerasBegin(),
1218              e = cgroup->camerasEnd();
1219          iter != e;
1220          ++iter) {
1221         const CameraInfo* cinfo = iter->get();
1222         if (cinfo == guiCamera)
1223             continue;
1224
1225         if (computeCameraIntersection(cinfo, windowPos, intersections))
1226             return true;
1227     }
1228
1229     intersections.clear();
1230     return false;
1231 }
1232
1233 void warpGUIPointer(CameraGroup* cgroup, int x, int y)
1234 {
1235     using osgViewer::GraphicsWindow;
1236     Camera* guiCamera = getGUICamera(cgroup);
1237     if (!guiCamera)
1238         return;
1239     Viewport* vport = guiCamera->getViewport();
1240     GraphicsWindow* gw
1241         = dynamic_cast<GraphicsWindow*>(guiCamera->getGraphicsContext());
1242     if (!gw)
1243         return;
1244     globals->get_renderer()->getEventHandler()->setMouseWarped();
1245     // Translate the warp request into the viewport of the GUI camera,
1246     // send the request to the window, then transform the coordinates
1247     // for the Viewer's event queue.
1248     double wx = x + vport->x();
1249     double wyUp = vport->height() + vport->y() - y;
1250     double wy;
1251     const GraphicsContext::Traits* traits = gw->getTraits();
1252     if (gw->getEventQueue()->getCurrentEventState()->getMouseYOrientation()
1253         == osgGA::GUIEventAdapter::Y_INCREASING_DOWNWARDS) {
1254         wy = traits->height - wyUp;
1255     } else {
1256         wy = wyUp;
1257     }
1258     gw->getEventQueue()->mouseWarped(wx, wy);
1259     gw->requestWarpPointer(wx, wy);
1260     osgGA::GUIEventAdapter* eventState
1261         = cgroup->getViewer()->getEventQueue()->getCurrentEventState();
1262     double viewerX
1263         = (eventState->getXmin()
1264            + ((wx / double(traits->width))
1265               * (eventState->getXmax() - eventState->getXmin())));
1266     double viewerY
1267         = (eventState->getYmin()
1268            + ((wyUp / double(traits->height))
1269               * (eventState->getYmax() - eventState->getYmin())));
1270     cgroup->getViewer()->getEventQueue()->mouseWarped(viewerX, viewerY);
1271 }
1272 }