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