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