src/Main/CameraGroup.cxx

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