src/Viewer/CameraGroup.cxx

   1 // Copyright (C) 2008  Tim Moore
   2 // Copyright (C) 2011  Mathias Froehlich
   3 //
   4 // This program is free software; you can redistribute it and/or
   5 // modify it under the terms of the GNU General Public License as
   6 // published by the Free Software Foundation; either version 2 of the
   7 // License, or (at your option) any later version.
   8 //
   9 // This program is distributed in the hope that it will be useful, but
  10 // WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 // General Public License for more details.
  13 //
  14 // You should have received a copy of the GNU General Public License
  15 // along with this program; if not, write to the Free Software
  16 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17
  18 #ifdef HAVE_CONFIG_H
  19 #  include <config.h>
  20 #endif
  21
  22 #include "CameraGroup.hxx"
  23
  24 #include <Main/fg_props.hxx>
  25 #include <Main/globals.hxx>
  26 #include "renderer.hxx"
  27 #include "FGEventHandler.hxx"
  28 #include "WindowBuilder.hxx"
  29 #include "WindowSystemAdapter.hxx"
  30 #include <simgear/props/props.hxx>
  31 #include <simgear/structure/OSGUtils.hxx>
  32 #include <simgear/structure/OSGVersion.hxx>
  33 #include <simgear/scene/material/EffectCullVisitor.hxx>
  34 #include <simgear/scene/util/RenderConstants.hxx>
  35
  36 #include <algorithm>
  37 #include <cstring>
  38 #include <string>
  39
  40 #include <osg/Camera>
  41 #include <osg/Geometry>
  42 #include <osg/GraphicsContext>
  43 #include <osg/io_utils>
  44 #include <osg/Math>
  45 #include <osg/Matrix>
  46 #include <osg/Notify>
  47 #include <osg/Program>
  48 #include <osg/Quat>
  49 #include <osg/TexMat>
  50 #include <osg/Vec3d>
  51 #include <osg/Viewport>
  52
  53 #include <osgUtil/IntersectionVisitor>
  54
  55 #include <osgViewer/GraphicsWindow>
  56 #include <osgViewer/Renderer>
  57
  58 namespace flightgear {
  59 const char* MAIN_CAMERA = "main";
  60 const char* FAR_CAMERA = "far";
  61 const char* GEOMETRY_CAMERA = "geometry";
  62 const char* SHADOW_CAMERA = "shadow";
  63 const char* LIGHTING_CAMERA = "lighting";
  64 const char* DISPLAY_CAMERA = "display";
  65 }
  66
  67 static osg::Matrix
  68 invert(const osg::Matrix& matrix)
  69 {
  70     return osg::Matrix::inverse(matrix);
  71 }
  72
  73 /// Returns the zoom factor of the master camera.
  74 /// The reference fov is the historic 55 deg
  75 static double
  76 zoomFactor()
  77 {
  78     double fov = fgGetDouble("/sim/current-view/field-of-view", 55);
  79     if (fov < 1)
  80         fov = 1;
  81     return tan(55*0.5*SG_DEGREES_TO_RADIANS)/tan(fov*0.5*SG_DEGREES_TO_RADIANS);
  82 }
  83
  84 static osg::Vec2d
  85 preMult(const osg::Vec2d& v, const osg::Matrix& m)
  86 {
  87   osg::Vec3d tmp = m.preMult(osg::Vec3(v, 0));
  88   return osg::Vec2d(tmp[0], tmp[1]);
  89 }
  90
  91 static osg::Matrix
  92 relativeProjection(const osg::Matrix& P0, const osg::Matrix& R, const osg::Vec2d ref[2],
  93                    const osg::Matrix& pP, const osg::Matrix& pR, const osg::Vec2d pRef[2])
  94 {
  95   // Track the way from one projection space to the other:
  96   // We want
  97   //  P = T*S*P0
  98   // where P0 is the projection template sensible for the given window size,
  99   // T is a translation matrix and S a scale matrix.
 100   // We need to determine T and S so that the reference points in the parents
 101   // projection space match the two reference points in this cameras projection space.
 102
 103   // Starting from the parents camera projection space, we get into this cameras
 104   // projection space by the transform matrix:
 105   //  P*R*inv(pP*pR) = T*S*P0*R*inv(pP*pR)
 106   // So, at first compute that matrix without T*S and determine S and T from that
 107
 108   // Ok, now osg uses the inverse matrix multiplication order, thus:
 109   osg::Matrix PtoPwithoutTS = invert(pR*pP)*R*P0;
 110   // Compute the parents reference points in the current projection space
 111   // without the yet unknown T and S
 112   osg::Vec2d pRefInThis[2] = {
 113     preMult(pRef[0], PtoPwithoutTS),
 114     preMult(pRef[1], PtoPwithoutTS)
 115   };
 116
 117   // To get the same zoom, rescale to match the parents size
 118   double s = (ref[0] - ref[1]).length()/(pRefInThis[0] - pRefInThis[1]).length();
 119   osg::Matrix S = osg::Matrix::scale(s, s, 1);
 120
 121   // For the translation offset, incorporate the now known scale
 122   // and recompute the position ot the first reference point in the
 123   // currents projection space without the yet unknown T.
 124   pRefInThis[0] = preMult(pRef[0], PtoPwithoutTS*S);
 125   // The translation is then the difference of the reference points
 126   osg::Matrix T = osg::Matrix::translate(osg::Vec3d(ref[0] - pRefInThis[0], 0));
 127
 128   // Compose and return the desired final projection matrix
 129   return P0*S*T;
 130 }
 131
 132 namespace flightgear
 133 {
 134 using namespace osg;
 135
 136 using std::strcmp;
 137 using std::string;
 138
 139 ref_ptr<CameraGroup> CameraGroup::_defaultGroup;
 140
 141 CameraGroup::CameraGroup(osgViewer::Viewer* viewer) :
 142     _viewer(viewer)
 143 {
 144 }
 145
 146 }
 147
 148 namespace
 149 {
 150 using namespace osg;
 151
 152 // Given a projection matrix, return a new one with the same frustum
 153 // sides and new near / far values.
 154
 155 void makeNewProjMat(Matrixd& oldProj, double znear,
 156                                        double zfar, Matrixd& projection)
 157 {
 158     projection = oldProj;
 159     // Slightly inflate the near & far planes to avoid objects at the
 160     // extremes being clipped out.
 161     znear *= 0.999;
 162     zfar *= 1.001;
 163
 164     // Clamp the projection matrix z values to the range (near, far)
 165     double epsilon = 1.0e-6;
 166     if (fabs(projection(0,3)) < epsilon &&
 167         fabs(projection(1,3)) < epsilon &&
 168         fabs(projection(2,3)) < epsilon) {
 169         // Projection is Orthographic
 170         epsilon = -1.0/(zfar - znear); // Used as a temp variable
 171         projection(2,2) = 2.0*epsilon;
 172         projection(3,2) = (zfar + znear)*epsilon;
 173     } else {
 174         // Projection is Perspective
 175         double trans_near = (-znear*projection(2,2) + projection(3,2)) /
 176             (-znear*projection(2,3) + projection(3,3));
 177         double trans_far = (-zfar*projection(2,2) + projection(3,2)) /
 178             (-zfar*projection(2,3) + projection(3,3));
 179         double ratio = fabs(2.0/(trans_near - trans_far));
 180         double center = -0.5*(trans_near + trans_far);
 181
 182         projection.postMult(osg::Matrixd(1.0, 0.0, 0.0, 0.0,
 183                                          0.0, 1.0, 0.0, 0.0,
 184                                          0.0, 0.0, ratio, 0.0,
 185                                          0.0, 0.0, center*ratio, 1.0));
 186     }
 187 }
 188 }
 189
 190 namespace flightgear
 191 {
 192 void CameraInfo::updateCameras()
 193 {
 194     bufferSize->set( osg::Vec2f( width, height ) );
 195
 196     for (CameraMap::iterator ii = cameras.begin(); ii != cameras.end(); ++ii ) {
 197         float f = ii->second.scaleFactor;
 198         if ( f == 0.0f ) continue;
 199         ii->second.camera->getViewport()->setViewport(x*f, y*f, width*f, height*f);
 200     }
 201
 202     for (RenderBufferMap::iterator ii = buffers.begin(); ii != buffers.end(); ++ii ) {
 203         float f = ii->second.scaleFactor;
 204         if ( f == 0.0f ) continue;
 205         osg::Texture2D* texture = ii->second.texture.get();
 206         if ( texture->getTextureHeight() != height*f || texture->getTextureWidth() != width*f ) {
 207             texture->setTextureSize( width*f, height*f );
 208             texture->dirtyTextureObject();
 209         }
 210     }
 211 }
 212
 213 void CameraInfo::resized(double w, double h)
 214 {
 215     bufferSize->set( osg::Vec2f( w, h ) );
 216
 217     for (RenderBufferMap::iterator ii = buffers.begin(); ii != buffers.end(); ++ii) {
 218         float s = ii->second.scaleFactor;
 219         if ( s == 0.0f ) continue;
 220         ii->second.texture->setTextureSize( w * s, h * s );
 221         ii->second.texture->dirtyTextureObject();
 222     }
 223
 224     for (CameraMap::iterator ii = cameras.begin(); ii != cameras.end(); ++ii) {
 225         RenderStageInfo& rsi = ii->second;
 226         if (!rsi.resizable ||
 227                 rsi.camera->getRenderTargetImplementation() != osg::Camera::FRAME_BUFFER_OBJECT ||
 228                 rsi.scaleFactor == 0.0f )
 229             continue;
 230
 231         Viewport* vp = rsi.camera->getViewport();
 232         vp->width() = w * rsi.scaleFactor;
 233         vp->height() = h * rsi.scaleFactor;
 234
 235         osgViewer::Renderer* renderer
 236             = static_cast<osgViewer::Renderer*>(rsi.camera->getRenderer());
 237         for (int i = 0; i < 2; ++i) {
 238             osgUtil::SceneView* sceneView = renderer->getSceneView(i);
 239             sceneView->getRenderStage()->setFrameBufferObject(0);
 240             sceneView->getRenderStage()->setCameraRequiresSetUp(true);
 241             if (sceneView->getRenderStageLeft()) {
 242                 sceneView->getRenderStageLeft()->setFrameBufferObject(0);
 243                 sceneView->getRenderStageLeft()->setCameraRequiresSetUp(true);
 244             }
 245             if (sceneView->getRenderStageRight()) {
 246                 sceneView->getRenderStageRight()->setFrameBufferObject(0);
 247                 sceneView->getRenderStageRight()->setCameraRequiresSetUp(true);
 248             }
 249         }
 250     }
 251 }
 252
 253 osg::Camera* CameraInfo::getCamera(const std::string& k) const
 254 {
 255     CameraMap::const_iterator ii = cameras.find( k );
 256     if (ii == cameras.end())
 257         return 0;
 258     return ii->second.camera.get();
 259 }
 260
 261 osg::Texture2D* CameraInfo::getBuffer(const std::string& k) const
 262 {
 263     RenderBufferMap::const_iterator ii = buffers.find(k);
 264     if (ii == buffers.end())
 265         return 0;
 266     return ii->second.texture.get();
 267 }
 268
 269 int CameraInfo::getMainSlaveIndex() const
 270 {
 271     return cameras.find( MAIN_CAMERA )->second.slaveIndex;
 272 }
 273
 274 void CameraInfo::setMatrices(osg::Camera* c)
 275 {
 276     view->set( c->getViewMatrix() );
 277     osg::Matrixd vi = c->getInverseViewMatrix();
 278     viewInverse->set( vi );
 279     projInverse->set( osg::Matrix::inverse( c->getProjectionMatrix() ) );
 280     osg::Vec4d pos = osg::Vec4d(0., 0., 0., 1.) * vi;
 281     worldPosCart->set( osg::Vec3f( pos.x(), pos.y(), pos.z() ) );
 282     SGGeod pos2 = SGGeod::fromCart( SGVec3d( pos.x(), pos.y(), pos.z() ) );
 283     worldPosGeod->set( osg::Vec3f( pos2.getLongitudeRad(), pos2.getLatitudeRad(), pos2.getElevationM() ) );
 284 }
 285
 286 void CameraGroup::update(const osg::Vec3d& position,
 287                          const osg::Quat& orientation)
 288 {
 289     const Matrix masterView(osg::Matrix::translate(-position)
 290                             * osg::Matrix::rotate(orientation.inverse()));
 291     _viewer->getCamera()->setViewMatrix(masterView);
 292     const Matrix& masterProj = _viewer->getCamera()->getProjectionMatrix();
 293     double masterZoomFactor = zoomFactor();
 294     for (CameraList::iterator i = _cameras.begin(); i != _cameras.end(); ++i) {
 295         const CameraInfo* info = i->get();
 296
 297         Camera* camera = info->getCamera(MAIN_CAMERA);
 298         if ( camera ) {
 299             const View::Slave& slave = _viewer->getSlave(info->getMainSlaveIndex());
 300 #if SG_OSG_VERSION_LESS_THAN(3,0,0)
 301             // refreshes camera viewports (for now)
 302             info->updateCameras();
 303 #endif
 304             Matrix viewMatrix;
 305             if (info->flags & GUI) {
 306                 viewMatrix = osg::Matrix(); // identifty transform on the GUI camera
 307             } else if ((info->flags & VIEW_ABSOLUTE) != 0)
 308                 viewMatrix = slave._viewOffset;
 309             else
 310                 viewMatrix = masterView * slave._viewOffset;
 311             camera->setViewMatrix(viewMatrix);
 312             Matrix projectionMatrix;
 313             if (info->flags & GUI) {
 314                 projectionMatrix = osg::Matrix::ortho2D(0, info->width, 0, info->height);
 315             } else if ((info->flags & PROJECTION_ABSOLUTE) != 0) {
 316                 if (info->flags & ENABLE_MASTER_ZOOM) {
 317                     if (info->relativeCameraParent < _cameras.size()) {
 318                         // template projection matrix and view matrix of the current camera
 319                         osg::Matrix P0 = slave._projectionOffset;
 320                         osg::Matrix R = viewMatrix;
 321
 322                         // The already known projection and view matrix of the parent camera
 323                         const CameraInfo* parentInfo = _cameras[info->relativeCameraParent].get();
 324                         RenderStageInfo prsi = parentInfo->cameras.find(MAIN_CAMERA)->second;
 325                         osg::Matrix pP = prsi.camera->getProjectionMatrix();
 326                         osg::Matrix pR = prsi.camera->getViewMatrix();
 327
 328                         // And the projection matrix derived from P0 so that the reference points match
 329                         projectionMatrix = relativeProjection(P0, R, info->thisReference,
 330                                                               pP, pR, info->parentReference);
 331
 332                     } else {
 333                         // We want to zoom, so take the original matrix and apply the zoom to it.
 334                         projectionMatrix = slave._projectionOffset;
 335                         projectionMatrix.postMultScale(osg::Vec3d(masterZoomFactor, masterZoomFactor, 1));
 336                     }
 337                 } else {
 338                     projectionMatrix = slave._projectionOffset;
 339                 }
 340             } else {
 341                 projectionMatrix = masterProj * slave._projectionOffset;
 342             }
 343
 344             CameraMap::const_iterator ii = info->cameras.find(FAR_CAMERA);
 345             if (ii == info->cameras.end() || !ii->second.camera.valid()) {
 346                 camera->setProjectionMatrix(projectionMatrix);
 347             } else {
 348                 Camera* farCamera = ii->second.camera;
 349                 farCamera->setViewMatrix(viewMatrix);
 350                 double left, right, bottom, top, parentNear, parentFar;
 351                 projectionMatrix.getFrustum(left, right, bottom, top,
 352                                             parentNear, parentFar);
 353                 if ((info->flags & FIXED_NEAR_FAR) == 0) {
 354                     parentNear = _zNear;
 355                     parentFar = _zFar;
 356                 }
 357                 if (parentFar < _nearField || _nearField == 0.0f) {
 358                     camera->setProjectionMatrix(projectionMatrix);
 359                     camera->setCullMask(camera->getCullMask()
 360                                         | simgear::BACKGROUND_BIT);
 361                     camera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
 362                     farCamera->setNodeMask(0);
 363                 } else {
 364                     Matrix nearProj, farProj;
 365                     makeNewProjMat(projectionMatrix, parentNear, _nearField,
 366                                    nearProj);
 367                     makeNewProjMat(projectionMatrix, _nearField, parentFar,
 368                                    farProj);
 369                     camera->setProjectionMatrix(nearProj);
 370                     camera->setCullMask(camera->getCullMask()
 371                                         & ~simgear::BACKGROUND_BIT);
 372                     camera->setClearMask(GL_DEPTH_BUFFER_BIT);
 373                     farCamera->setProjectionMatrix(farProj);
 374                     farCamera->setNodeMask(camera->getNodeMask());
 375                 }
 376             }
 377         } else {
 378             bool viewDone = false;
 379             Matrix viewMatrix;
 380             bool projectionDone = false;
 381             Matrix projectionMatrix;
 382             for ( CameraMap::const_iterator ii = info->cameras.begin(); ii != info->cameras.end(); ++ii ) {
 383                 if ( ii->first == SHADOW_CAMERA ) {
 384                     globals->get_renderer()->updateShadowCamera(info, position);
 385                     continue;
 386                 }
 387                 if ( ii->second.fullscreen )
 388                     continue;
 389
 390                 Camera* camera = ii->second.camera.get();
 391                 int slaveIndex = ii->second.slaveIndex;
 392                 const View::Slave& slave = _viewer->getSlave(slaveIndex);
 393
 394                 if ( !viewDone ) {
 395                     if ((info->flags & VIEW_ABSOLUTE) != 0)
 396                         viewMatrix = slave._viewOffset;
 397                     else
 398                         viewMatrix = masterView * slave._viewOffset;
 399                     viewDone = true;
 400                 }
 401
 402                 camera->setViewMatrix( viewMatrix );
 403
 404                 if ( !projectionDone ) {
 405                     if ((info->flags & PROJECTION_ABSOLUTE) != 0) {
 406                         if (info->flags & ENABLE_MASTER_ZOOM) {
 407                             if (info->relativeCameraParent < _cameras.size()) {
 408                                 // template projection matrix and view matrix of the current camera
 409                                 osg::Matrix P0 = slave._projectionOffset;
 410                                 osg::Matrix R = viewMatrix;
 411
 412                                 // The already known projection and view matrix of the parent camera
 413                                 const CameraInfo* parentInfo = _cameras[info->relativeCameraParent].get();
 414                                 RenderStageInfo prsi = parentInfo->cameras.find(MAIN_CAMERA)->second;
 415                                 osg::Matrix pP = prsi.camera->getProjectionMatrix();
 416                                 osg::Matrix pR = prsi.camera->getViewMatrix();
 417
 418                                 // And the projection matrix derived from P0 so that the reference points match
 419                                 projectionMatrix = relativeProjection(P0, R, info->thisReference,
 420                                                                       pP, pR, info->parentReference);
 421
 422                             } else {
 423                                 // We want to zoom, so take the original matrix and apply the zoom to it.
 424                                 projectionMatrix = slave._projectionOffset;
 425                                 projectionMatrix.postMultScale(osg::Vec3d(masterZoomFactor, masterZoomFactor, 1));
 426                             }
 427                         } else {
 428                             projectionMatrix = slave._projectionOffset;
 429                         }
 430                     } else {
 431                         projectionMatrix = masterProj * slave._projectionOffset;
 432                     }
 433                     projectionDone = true;
 434                 }
 435
 436                 camera->setProjectionMatrix(projectionMatrix);
 437             }
 438         }
 439     }
 440
 441     globals->get_renderer()->setPlanes( _zNear, _zFar );
 442 }
 443
 444 void CameraGroup::setCameraParameters(float vfov, float aspectRatio)
 445 {
 446     if (vfov != 0.0f && aspectRatio != 0.0f)
 447         _viewer->getCamera()
 448             ->setProjectionMatrixAsPerspective(vfov,
 449                                                1.0f / aspectRatio,
 450                                                _zNear, _zFar);
 451 }
 452
 453 double CameraGroup::getMasterAspectRatio() const
 454 {
 455     if (_cameras.empty())
 456         return 0.0;
 457
 458     const CameraInfo* info = _cameras.front();
 459
 460     osg::Camera* camera = info->getCamera(MAIN_CAMERA);
 461     if ( !camera )
 462         camera = info->getCamera( GEOMETRY_CAMERA );
 463     const osg::Viewport* viewport = camera->getViewport();
 464     if (!viewport) {
 465         return 0.0;
 466     }
 467
 468     return static_cast<double>(viewport->height()) / viewport->width();
 469 }
 470
 471 }
 472
 473 namespace
 474 {
 475 // A raw value for property nodes that references a class member via
 476 // an osg::ref_ptr.
 477 template<class C, class T>
 478 class RefMember : public SGRawValue<T>
 479 {
 480 public:
 481     RefMember (C *obj, T C::*ptr)
 482         : _obj(obj), _ptr(ptr) {}
 483     virtual ~RefMember () {}
 484     virtual T getValue () const
 485     {
 486         return _obj.get()->*_ptr;
 487     }
 488     virtual bool setValue (T value)
 489     {
 490         _obj.get()->*_ptr = value;
 491         return true;
 492     }
 493     virtual SGRawValue<T> * clone () const
 494     {
 495         return new RefMember(_obj.get(), _ptr);
 496     }
 497 private:
 498     ref_ptr<C> _obj;
 499     T C::* const _ptr;
 500 };
 501
 502 template<typename C, typename T>
 503 RefMember<C, T> makeRefMember(C *obj, T C::*ptr)
 504 {
 505     return RefMember<C, T>(obj, ptr);
 506 }
 507
 508 template<typename C, typename T>
 509 void bindMemberToNode(SGPropertyNode* parent, const char* childName,
 510                       C* obj, T C::*ptr, T value)
 511 {
 512     SGPropertyNode* valNode = parent->getNode(childName);
 513     RefMember<C, T> refMember = makeRefMember(obj, ptr);
 514     if (!valNode) {
 515         valNode = parent->getNode(childName, true);
 516         valNode->tie(refMember, false);
 517         setValue(valNode, value);
 518     } else {
 519         valNode->tie(refMember, true);
 520     }
 521 }
 522
 523 void buildViewport(flightgear::CameraInfo* info, SGPropertyNode* viewportNode,
 524                    const osg::GraphicsContext::Traits *traits)
 525 {
 526     using namespace flightgear;
 527     bindMemberToNode(viewportNode, "x", info, &CameraInfo::x, 0.0);
 528     bindMemberToNode(viewportNode, "y", info, &CameraInfo::y, 0.0);
 529     bindMemberToNode(viewportNode, "width", info, &CameraInfo::width,
 530                      static_cast<double>(traits->width));
 531     bindMemberToNode(viewportNode, "height", info, &CameraInfo::height,
 532                      static_cast<double>(traits->height));
 533 }
 534 }
 535
 536 namespace flightgear
 537 {
 538
 539 // Mostly copied from osg's osgViewer/View.cpp
 540
 541 static osg::Geometry* createPanoramicSphericalDisplayDistortionMesh(
 542     const Vec3& origin, const Vec3& widthVector, const Vec3& heightVector,
 543     double sphere_radius, double collar_radius,
 544     Image* intensityMap = 0, const Matrix& projectorMatrix = Matrix())
 545 {
 546     osg::Vec3d center(0.0,0.0,0.0);
 547     osg::Vec3d eye(0.0,0.0,0.0);
 548
 549     double distance = sqrt(sphere_radius*sphere_radius - collar_radius*collar_radius);
 550     bool flip = false;
 551     bool texcoord_flip = false;
 552
 553 #if 0
 554     osg::Vec3d projector = eye - osg::Vec3d(0.0,0.0, distance);
 555
 556     OSG_INFO<<"createPanoramicSphericalDisplayDistortionMesh : Projector position = "<<projector<<std::endl;
 557     OSG_INFO<<"createPanoramicSphericalDisplayDistortionMesh : distance = "<<distance<<std::endl;
 558 #endif
 559     // create the quad to visualize.
 560     osg::Geometry* geometry = new osg::Geometry();
 561
 562     geometry->setSupportsDisplayList(false);
 563
 564     osg::Vec3 xAxis(widthVector);
 565     float width = widthVector.length();
 566     xAxis /= width;
 567
 568     osg::Vec3 yAxis(heightVector);
 569     float height = heightVector.length();
 570     yAxis /= height;
 571
 572     int noSteps = 160;
 573
 574     osg::Vec3Array* vertices = new osg::Vec3Array;
 575     osg::Vec2Array* texcoords0 = new osg::Vec2Array;
 576     osg::Vec2Array* texcoords1 = intensityMap==0 ? new osg::Vec2Array : 0;
 577     osg::Vec4Array* colors = new osg::Vec4Array;
 578
 579 #if 0
 580     osg::Vec3 bottom = origin;
 581     osg::Vec3 dx = xAxis*(width/((float)(noSteps-2)));
 582     osg::Vec3 dy = yAxis*(height/((float)(noSteps-1)));
 583 #endif
 584     osg::Vec3 top = origin + yAxis*height;
 585
 586     osg::Vec3 screenCenter = origin + widthVector*0.5f + heightVector*0.5f;
 587     float screenRadius = heightVector.length() * 0.5f;
 588
 589     geometry->getOrCreateStateSet()->setMode(GL_CULL_FACE, osg::StateAttribute::OFF | osg::StateAttribute::PROTECTED);
 590
 591     for(int i=0;i<noSteps;++i)
 592     {
 593         //osg::Vec3 cursor = bottom+dy*(float)i;
 594         for(int j=0;j<noSteps;++j)
 595         {
 596             osg::Vec2 texcoord(double(i)/double(noSteps-1), double(j)/double(noSteps-1));
 597             double theta = texcoord.x() * 2.0 * osg::PI;
 598             double phi = (1.0-texcoord.y()) * osg::PI;
 599
 600             if (texcoord_flip) texcoord.y() = 1.0f - texcoord.y();
 601
 602             osg::Vec3 pos(sin(phi)*sin(theta), sin(phi)*cos(theta), cos(phi));
 603             pos = pos*projectorMatrix;
 604
 605             double alpha = atan2(pos.x(), pos.y());
 606             if (alpha<0.0) alpha += 2.0*osg::PI;
 607
 608             double beta = atan2(sqrt(pos.x()*pos.x() + pos.y()*pos.y()), pos.z());
 609             if (beta<0.0) beta += 2.0*osg::PI;
 610
 611             double gamma = atan2(sqrt(double(pos.x()*pos.x() + pos.y()*pos.y())), double(pos.z()+distance));
 612             if (gamma<0.0) gamma += 2.0*osg::PI;
 613
 614
 615             osg::Vec3 v = screenCenter + osg::Vec3(sin(alpha)*gamma*2.0/osg::PI, -cos(alpha)*gamma*2.0/osg::PI, 0.0f)*screenRadius;
 616
 617             if (flip)
 618                 vertices->push_back(osg::Vec3(v.x(), top.y()-(v.y()-origin.y()),v.z()));
 619             else
 620                 vertices->push_back(v);
 621
 622             texcoords0->push_back( texcoord );
 623
 624             osg::Vec2 texcoord1(alpha/(2.0*osg::PI), 1.0f - beta/osg::PI);
 625             if (intensityMap)
 626             {
 627                 colors->push_back(intensityMap->getColor(texcoord1));
 628             }
 629             else
 630             {
 631                 colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
 632                 if (texcoords1) texcoords1->push_back( texcoord1 );
 633             }
 634
 635
 636         }
 637     }
 638
 639
 640     // pass the created vertex array to the points geometry object.
 641     geometry->setVertexArray(vertices);
 642
 643     geometry->setColorArray(colors);
 644     geometry->setColorBinding(osg::Geometry::BIND_PER_VERTEX);
 645
 646     geometry->setTexCoordArray(0,texcoords0);
 647     if (texcoords1) geometry->setTexCoordArray(1,texcoords1);
 648
 649     osg::DrawElementsUShort* elements = new osg::DrawElementsUShort(osg::PrimitiveSet::TRIANGLES);
 650     geometry->addPrimitiveSet(elements);
 651
 652     for(int i=0;i<noSteps-1;++i)
 653     {
 654         for(int j=0;j<noSteps-1;++j)
 655         {
 656             int i1 = j+(i+1)*noSteps;
 657             int i2 = j+(i)*noSteps;
 658             int i3 = j+1+(i)*noSteps;
 659             int i4 = j+1+(i+1)*noSteps;
 660
 661             osg::Vec3& v1 = (*vertices)[i1];
 662             osg::Vec3& v2 = (*vertices)[i2];
 663             osg::Vec3& v3 = (*vertices)[i3];
 664             osg::Vec3& v4 = (*vertices)[i4];
 665
 666             if ((v1-screenCenter).length()>screenRadius) continue;
 667             if ((v2-screenCenter).length()>screenRadius) continue;
 668             if ((v3-screenCenter).length()>screenRadius) continue;
 669             if ((v4-screenCenter).length()>screenRadius) continue;
 670
 671             elements->push_back(i1);
 672             elements->push_back(i2);
 673             elements->push_back(i3);
 674
 675             elements->push_back(i1);
 676             elements->push_back(i3);
 677             elements->push_back(i4);
 678         }
 679     }
 680
 681     return geometry;
 682 }
 683
 684 void CameraGroup::buildDistortionCamera(const SGPropertyNode* psNode,
 685                                         Camera* camera)
 686 {
 687     const SGPropertyNode* texNode = psNode->getNode("texture");
 688     if (!texNode) {
 689         // error
 690         return;
 691     }
 692     string texName = texNode->getStringValue();
 693     TextureMap::iterator itr = _textureTargets.find(texName);
 694     if (itr == _textureTargets.end()) {
 695         // error
 696         return;
 697     }
 698     Viewport* viewport = camera->getViewport();
 699     float width = viewport->width();
 700     float height = viewport->height();
 701     TextureRectangle* texRect = itr->second.get();
 702     double radius = psNode->getDoubleValue("radius", 1.0);
 703     double collar = psNode->getDoubleValue("collar", 0.45);
 704     Geode* geode = new Geode();
 705     geode->addDrawable(createPanoramicSphericalDisplayDistortionMesh(
 706                            Vec3(0.0f,0.0f,0.0f), Vec3(width,0.0f,0.0f),
 707                            Vec3(0.0f,height,0.0f), radius, collar));
 708
 709     // new we need to add the texture to the mesh, we do so by creating a
 710     // StateSet to contain the Texture StateAttribute.
 711     StateSet* stateset = geode->getOrCreateStateSet();
 712     stateset->setTextureAttributeAndModes(0, texRect, StateAttribute::ON);
 713     stateset->setMode(GL_LIGHTING, StateAttribute::OFF);
 714
 715     TexMat* texmat = new TexMat;
 716     texmat->setScaleByTextureRectangleSize(true);
 717     stateset->setTextureAttributeAndModes(0, texmat, osg::StateAttribute::ON);
 718 #if 0
 719     if (!applyIntensityMapAsColours && intensityMap)
 720     {
 721         stateset->setTextureAttributeAndModes(1, new osg::Texture2D(intensityMap), osg::StateAttribute::ON);
 722     }
 723 #endif
 724     // add subgraph to render
 725     camera->addChild(geode);
 726     camera->setClearMask(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
 727     camera->setClearColor(osg::Vec4(0.0, 0.0, 0.0, 1.0));
 728     camera->setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR);
 729     camera->setCullingMode(osg::CullSettings::NO_CULLING);
 730     camera->setName("DistortionCorrectionCamera");
 731 }
 732
 733 CameraInfo* CameraGroup::buildCamera(SGPropertyNode* cameraNode)
 734 {
 735     WindowBuilder *wBuild = WindowBuilder::getWindowBuilder();
 736     const SGPropertyNode* windowNode = cameraNode->getNode("window");
 737     GraphicsWindow* window = 0;
 738     int cameraFlags = DO_INTERSECTION_TEST;
 739     if (windowNode) {
 740         // New style window declaration / definition
 741         window = wBuild->buildWindow(windowNode);
 742     } else {
 743         // Old style: suck window params out of camera block
 744         window = wBuild->buildWindow(cameraNode);
 745     }
 746     if (!window) {
 747         return 0;
 748     }
 749     Camera* camera = new Camera;
 750     camera->setAllowEventFocus(false);
 751     camera->setGraphicsContext(window->gc.get());
 752     camera->setViewport(new Viewport);
 753     camera->setCullingMode(CullSettings::SMALL_FEATURE_CULLING
 754                            | CullSettings::VIEW_FRUSTUM_CULLING);
 755     camera->setInheritanceMask(CullSettings::ALL_VARIABLES
 756                                & ~(CullSettings::CULL_MASK
 757                                    | CullSettings::CULLING_MODE
 758                                    | CullSettings::CLEAR_MASK
 759                                    ));
 760
 761     osg::Matrix vOff;
 762     const SGPropertyNode* viewNode = cameraNode->getNode("view");
 763     if (viewNode) {
 764         double heading = viewNode->getDoubleValue("heading-deg", 0.0);
 765         double pitch = viewNode->getDoubleValue("pitch-deg", 0.0);
 766         double roll = viewNode->getDoubleValue("roll-deg", 0.0);
 767         double x = viewNode->getDoubleValue("x", 0.0);
 768         double y = viewNode->getDoubleValue("y", 0.0);
 769         double z = viewNode->getDoubleValue("z", 0.0);
 770         // Build a view matrix, which is the inverse of a model
 771         // orientation matrix.
 772         vOff = (Matrix::translate(-x, -y, -z)
 773                 * Matrix::rotate(-DegreesToRadians(heading),
 774                                  Vec3d(0.0, 1.0, 0.0),
 775                                  -DegreesToRadians(pitch),
 776                                  Vec3d(1.0, 0.0, 0.0),
 777                                  -DegreesToRadians(roll),
 778                                  Vec3d(0.0, 0.0, 1.0)));
 779         if (viewNode->getBoolValue("absolute", false))
 780             cameraFlags |= VIEW_ABSOLUTE;
 781     } else {
 782         // Old heading parameter, works in the opposite direction
 783         double heading = cameraNode->getDoubleValue("heading-deg", 0.0);
 784         vOff.makeRotate(DegreesToRadians(heading), osg::Vec3(0, 1, 0));
 785     }
 786     // Configuring the physical dimensions of a monitor
 787     SGPropertyNode* viewportNode = cameraNode->getNode("viewport", true);
 788     double physicalWidth = viewportNode->getDoubleValue("width", 1024);
 789     double physicalHeight = viewportNode->getDoubleValue("height", 768);
 790     double bezelHeightTop = 0;
 791     double bezelHeightBottom = 0;
 792     double bezelWidthLeft = 0;
 793     double bezelWidthRight = 0;
 794     const SGPropertyNode* physicalDimensionsNode = 0;
 795     if ((physicalDimensionsNode = cameraNode->getNode("physical-dimensions")) != 0) {
 796         physicalWidth = physicalDimensionsNode->getDoubleValue("width", physicalWidth);
 797         physicalHeight = physicalDimensionsNode->getDoubleValue("height", physicalHeight);
 798         const SGPropertyNode* bezelNode = 0;
 799         if ((bezelNode = physicalDimensionsNode->getNode("bezel")) != 0) {
 800             bezelHeightTop = bezelNode->getDoubleValue("top", bezelHeightTop);
 801             bezelHeightBottom = bezelNode->getDoubleValue("bottom", bezelHeightBottom);
 802             bezelWidthLeft = bezelNode->getDoubleValue("left", bezelWidthLeft);
 803             bezelWidthRight = bezelNode->getDoubleValue("right", bezelWidthRight);
 804         }
 805     }
 806     osg::Matrix pOff;
 807     unsigned parentCameraIndex = ~0u;
 808     osg::Vec2d parentReference[2];
 809     osg::Vec2d thisReference[2];
 810     SGPropertyNode* projectionNode = 0;
 811     if ((projectionNode = cameraNode->getNode("perspective")) != 0) {
 812         double fovy = projectionNode->getDoubleValue("fovy-deg", 55.0);
 813         double aspectRatio = projectionNode->getDoubleValue("aspect-ratio",
 814                                                             1.0);
 815         double zNear = projectionNode->getDoubleValue("near", 0.0);
 816         double zFar = projectionNode->getDoubleValue("far", zNear + 20000);
 817         double offsetX = projectionNode->getDoubleValue("offset-x", 0.0);
 818         double offsetY = projectionNode->getDoubleValue("offset-y", 0.0);
 819         double tan_fovy = tan(DegreesToRadians(fovy*0.5));
 820         double right = tan_fovy * aspectRatio * zNear + offsetX;
 821         double left = -tan_fovy * aspectRatio * zNear + offsetX;
 822         double top = tan_fovy * zNear + offsetY;
 823         double bottom = -tan_fovy * zNear + offsetY;
 824         pOff.makeFrustum(left, right, bottom, top, zNear, zFar);
 825         cameraFlags |= PROJECTION_ABSOLUTE;
 826         if (projectionNode->getBoolValue("fixed-near-far", true))
 827             cameraFlags |= FIXED_NEAR_FAR;
 828     } else if ((projectionNode = cameraNode->getNode("frustum")) != 0
 829                || (projectionNode = cameraNode->getNode("ortho")) != 0) {
 830         double top = projectionNode->getDoubleValue("top", 0.0);
 831         double bottom = projectionNode->getDoubleValue("bottom", 0.0);
 832         double left = projectionNode->getDoubleValue("left", 0.0);
 833         double right = projectionNode->getDoubleValue("right", 0.0);
 834         double zNear = projectionNode->getDoubleValue("near", 0.0);
 835         double zFar = projectionNode->getDoubleValue("far", zNear + 20000);
 836         if (cameraNode->getNode("frustum")) {
 837             pOff.makeFrustum(left, right, bottom, top, zNear, zFar);
 838             cameraFlags |= PROJECTION_ABSOLUTE;
 839         } else {
 840             pOff.makeOrtho(left, right, bottom, top, zNear, zFar);
 841             cameraFlags |= (PROJECTION_ABSOLUTE | ORTHO);
 842         }
 843         if (projectionNode->getBoolValue("fixed-near-far", true))
 844             cameraFlags |= FIXED_NEAR_FAR;
 845     } else if ((projectionNode = cameraNode->getNode("master-perspective")) != 0) {
 846         double zNear = projectionNode->getDoubleValue("eye-distance", 0.4*physicalWidth);
 847         double xoff = projectionNode->getDoubleValue("x-offset", 0);
 848         double yoff = projectionNode->getDoubleValue("y-offset", 0);
 849         double left = -0.5*physicalWidth - xoff;
 850         double right = 0.5*physicalWidth - xoff;
 851         double bottom = -0.5*physicalHeight - yoff;
 852         double top = 0.5*physicalHeight - yoff;
 853         pOff.makeFrustum(left, right, bottom, top, zNear, zNear*1000);
 854         cameraFlags |= PROJECTION_ABSOLUTE | ENABLE_MASTER_ZOOM;
 855     } else if ((projectionNode = cameraNode->getNode("right-of-perspective"))
 856                || (projectionNode = cameraNode->getNode("left-of-perspective"))
 857                || (projectionNode = cameraNode->getNode("above-perspective"))
 858                || (projectionNode = cameraNode->getNode("below-perspective"))
 859                || (projectionNode = cameraNode->getNode("reference-points-perspective"))) {
 860         std::string name = projectionNode->getStringValue("parent-camera");
 861         for (unsigned i = 0; i < _cameras.size(); ++i) {
 862             if (_cameras[i]->name != name)
 863                 continue;
 864             parentCameraIndex = i;
 865         }
 866         if (_cameras.size() <= parentCameraIndex) {
 867             SG_LOG(SG_VIEW, SG_ALERT, "CameraGroup::buildCamera: "
 868                    "failed to find parent camera for relative camera!");
 869             return 0;
 870         }
 871         const CameraInfo* parentInfo = _cameras[parentCameraIndex].get();
 872         if (projectionNode->getNameString() == "right-of-perspective") {
 873             double tmp = (parentInfo->physicalWidth + 2*parentInfo->bezelWidthRight)/parentInfo->physicalWidth;
 874             parentReference[0] = osg::Vec2d(tmp, -1);
 875             parentReference[1] = osg::Vec2d(tmp, 1);
 876             tmp = (physicalWidth + 2*bezelWidthLeft)/physicalWidth;
 877             thisReference[0] = osg::Vec2d(-tmp, -1);
 878             thisReference[1] = osg::Vec2d(-tmp, 1);
 879         } else if (projectionNode->getNameString() == "left-of-perspective") {
 880             double tmp = (parentInfo->physicalWidth + 2*parentInfo->bezelWidthLeft)/parentInfo->physicalWidth;
 881             parentReference[0] = osg::Vec2d(-tmp, -1);
 882             parentReference[1] = osg::Vec2d(-tmp, 1);
 883             tmp = (physicalWidth + 2*bezelWidthRight)/physicalWidth;
 884             thisReference[0] = osg::Vec2d(tmp, -1);
 885             thisReference[1] = osg::Vec2d(tmp, 1);
 886         } else if (projectionNode->getNameString() == "above-perspective") {
 887             double tmp = (parentInfo->physicalHeight + 2*parentInfo->bezelHeightTop)/parentInfo->physicalHeight;
 888             parentReference[0] = osg::Vec2d(-1, tmp);
 889             parentReference[1] = osg::Vec2d(1, tmp);
 890             tmp = (physicalHeight + 2*bezelHeightBottom)/physicalHeight;
 891             thisReference[0] = osg::Vec2d(-1, -tmp);
 892             thisReference[1] = osg::Vec2d(1, -tmp);
 893         } else if (projectionNode->getNameString() == "below-perspective") {
 894             double tmp = (parentInfo->physicalHeight + 2*parentInfo->bezelHeightBottom)/parentInfo->physicalHeight;
 895             parentReference[0] = osg::Vec2d(-1, -tmp);
 896             parentReference[1] = osg::Vec2d(1, -tmp);
 897             tmp = (physicalHeight + 2*bezelHeightTop)/physicalHeight;
 898             thisReference[0] = osg::Vec2d(-1, tmp);
 899             thisReference[1] = osg::Vec2d(1, tmp);
 900         } else if (projectionNode->getNameString() == "reference-points-perspective") {
 901             SGPropertyNode* parentNode = projectionNode->getNode("parent", true);
 902             SGPropertyNode* thisNode = projectionNode->getNode("this", true);
 903             SGPropertyNode* pointNode;
 904
 905             pointNode = parentNode->getNode("point", 0, true);
 906             parentReference[0][0] = pointNode->getDoubleValue("x", 0)*2/parentInfo->physicalWidth;
 907             parentReference[0][1] = pointNode->getDoubleValue("y", 0)*2/parentInfo->physicalHeight;
 908             pointNode = parentNode->getNode("point", 1, true);
 909             parentReference[1][0] = pointNode->getDoubleValue("x", 0)*2/parentInfo->physicalWidth;
 910             parentReference[1][1] = pointNode->getDoubleValue("y", 0)*2/parentInfo->physicalHeight;
 911
 912             pointNode = thisNode->getNode("point", 0, true);
 913             thisReference[0][0] = pointNode->getDoubleValue("x", 0)*2/physicalWidth;
 914             thisReference[0][1] = pointNode->getDoubleValue("y", 0)*2/physicalHeight;
 915             pointNode = thisNode->getNode("point", 1, true);
 916             thisReference[1][0] = pointNode->getDoubleValue("x", 0)*2/physicalWidth;
 917             thisReference[1][1] = pointNode->getDoubleValue("y", 0)*2/physicalHeight;
 918         }
 919
 920         pOff = osg::Matrix::perspective(45, physicalWidth/physicalHeight, 1, 20000);
 921         cameraFlags |= PROJECTION_ABSOLUTE | ENABLE_MASTER_ZOOM;
 922     } else {
 923         // old style shear parameters
 924         double shearx = cameraNode->getDoubleValue("shear-x", 0);
 925         double sheary = cameraNode->getDoubleValue("shear-y", 0);
 926         pOff.makeTranslate(-shearx, -sheary, 0);
 927     }
 928     const SGPropertyNode* textureNode = cameraNode->getNode("texture");
 929     if (textureNode) {
 930         string texName = textureNode->getStringValue("name");
 931         int tex_width = textureNode->getIntValue("width");
 932         int tex_height = textureNode->getIntValue("height");
 933         TextureRectangle* texture = new TextureRectangle;
 934
 935         texture->setTextureSize(tex_width, tex_height);
 936         texture->setInternalFormat(GL_RGB);
 937         texture->setFilter(Texture::MIN_FILTER, Texture::LINEAR);
 938         texture->setFilter(Texture::MAG_FILTER, Texture::LINEAR);
 939         texture->setWrap(Texture::WRAP_S, Texture::CLAMP_TO_EDGE);
 940         texture->setWrap(Texture::WRAP_T, Texture::CLAMP_TO_EDGE);
 941         camera->setDrawBuffer(GL_FRONT);
 942         camera->setReadBuffer(GL_FRONT);
 943         camera->setRenderTargetImplementation(Camera::FRAME_BUFFER_OBJECT);
 944         camera->attach(Camera::COLOR_BUFFER, texture);
 945         _textureTargets[texName] = texture;
 946     } else {
 947         camera->setDrawBuffer(GL_BACK);
 948         camera->setReadBuffer(GL_BACK);
 949     }
 950     const SGPropertyNode* psNode = cameraNode->getNode("panoramic-spherical");
 951     bool useMasterSceneGraph = !psNode;
 952     CameraInfo* info = globals->get_renderer()->buildRenderingPipeline(this, cameraFlags, camera, vOff, pOff,
 953                                                                         window->gc.get(), useMasterSceneGraph);
 954     info->name = cameraNode->getStringValue("name");
 955     info->physicalWidth = physicalWidth;
 956     info->physicalHeight = physicalHeight;
 957     info->bezelHeightTop = bezelHeightTop;
 958     info->bezelHeightBottom = bezelHeightBottom;
 959     info->bezelWidthLeft = bezelWidthLeft;
 960     info->bezelWidthRight = bezelWidthRight;
 961     info->relativeCameraParent = parentCameraIndex;
 962     info->parentReference[0] = parentReference[0];
 963     info->parentReference[1] = parentReference[1];
 964     info->thisReference[0] = thisReference[0];
 965     info->thisReference[1] = thisReference[1];
 966     // If a viewport isn't set on the camera, then it's hard to dig it
 967     // out of the SceneView objects in the viewer, and the coordinates
 968     // of mouse events are somewhat bizzare.
 969     buildViewport(info, viewportNode, window->gc->getTraits());
 970     info->updateCameras();
 971     // Distortion camera needs the viewport which is created by addCamera().
 972     if (psNode) {
 973         info->flags = info->flags | VIEW_ABSOLUTE;
 974         buildDistortionCamera(psNode, camera);
 975     }
 976     return info;
 977 }
 978
 979 CameraInfo* CameraGroup::buildGUICamera(SGPropertyNode* cameraNode,
 980                                         GraphicsWindow* window)
 981 {
 982     WindowBuilder *wBuild = WindowBuilder::getWindowBuilder();
 983     const SGPropertyNode* windowNode = (cameraNode
 984                                         ? cameraNode->getNode("window")
 985                                         : 0);
 986     if (!window && windowNode) {
 987       // New style window declaration / definition
 988       window = wBuild->buildWindow(windowNode);
 989     }
 990
 991     if (!window) { // buildWindow can fail
 992       SG_LOG(SG_VIEW, SG_WARN, "CameraGroup::buildGUICamera: failed to build a window");
 993       return NULL;
 994     }
 995
 996     Camera* camera = new Camera;
 997     camera->setName( "GUICamera" );
 998     camera->setAllowEventFocus(false);
 999     camera->setGraphicsContext(window->gc.get());
1000     camera->setViewport(new Viewport);
1001     camera->setClearMask(0);
1002     camera->setInheritanceMask(CullSettings::ALL_VARIABLES
1003                                & ~(CullSettings::COMPUTE_NEAR_FAR_MODE
1004                                    | CullSettings::CULLING_MODE
1005                                    | CullSettings::CLEAR_MASK
1006                                    ));
1007     camera->setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR);
1008     camera->setCullingMode(osg::CullSettings::NO_CULLING);
1009     camera->setProjectionResizePolicy(Camera::FIXED);
1010     camera->setReferenceFrame(Transform::ABSOLUTE_RF);
1011     const int cameraFlags = GUI | DO_INTERSECTION_TEST;
1012
1013     CameraInfo* result = new CameraInfo(cameraFlags);
1014     // The camera group will always update the camera
1015     camera->setReferenceFrame(Transform::ABSOLUTE_RF);
1016
1017     getViewer()->addSlave(camera, Matrixd::identity(), Matrixd::identity(), false);
1018     //installCullVisitor(camera);
1019     int slaveIndex = getViewer()->getNumSlaves() - 1;
1020     result->addCamera( MAIN_CAMERA, camera, slaveIndex );
1021     camera->setRenderOrder(Camera::POST_RENDER, slaveIndex);
1022     addCamera(result);
1023
1024     // XXX Camera needs to be drawn last; eventually the render order
1025     // should be assigned by a camera manager.
1026     camera->setRenderOrder(osg::Camera::POST_RENDER, 10000);
1027     SGPropertyNode* viewportNode = cameraNode->getNode("viewport", true);
1028     buildViewport(result, viewportNode, window->gc->getTraits());
1029
1030     // Disable statistics for the GUI camera.
1031     camera->setStats(0);
1032     result->updateCameras();
1033     return result;
1034 }
1035
1036 CameraGroup* CameraGroup::buildCameraGroup(osgViewer::Viewer* viewer,
1037                                            SGPropertyNode* gnode)
1038 {
1039     CameraGroup* cgroup = new CameraGroup(viewer);
1040     for (int i = 0; i < gnode->nChildren(); ++i) {
1041         SGPropertyNode* pNode = gnode->getChild(i);
1042         const char* name = pNode->getName();
1043         if (!strcmp(name, "camera")) {
1044             cgroup->buildCamera(pNode);
1045         } else if (!strcmp(name, "window")) {
1046             WindowBuilder::getWindowBuilder()->buildWindow(pNode);
1047         } else if (!strcmp(name, "gui")) {
1048             cgroup->buildGUICamera(pNode);
1049         }
1050     }
1051     bindMemberToNode(gnode, "znear", cgroup, &CameraGroup::_zNear, .1f);
1052     bindMemberToNode(gnode, "zfar", cgroup, &CameraGroup::_zFar, 120000.0f);
1053     bindMemberToNode(gnode, "near-field", cgroup, &CameraGroup::_nearField,
1054                      100.0f);
1055     return cgroup;
1056 }
1057
1058 void CameraGroup::setCameraCullMasks(Node::NodeMask nm)
1059 {
1060     for (CameraIterator i = camerasBegin(), e = camerasEnd(); i != e; ++i) {
1061         CameraInfo* info = i->get();
1062         if (info->flags & GUI)
1063             continue;
1064         osg::ref_ptr<osg::Camera> farCamera = info->getCamera(FAR_CAMERA);
1065         osg::Camera* camera = info->getCamera( MAIN_CAMERA );
1066         if (camera) {
1067             if (farCamera.valid() && farCamera->getNodeMask() != 0) {
1068                 camera->setCullMask(nm & ~simgear::BACKGROUND_BIT);
1069                 camera->setCullMaskLeft(nm & ~simgear::BACKGROUND_BIT);
1070                 camera->setCullMaskRight(nm & ~simgear::BACKGROUND_BIT);
1071                 farCamera->setCullMask(nm);
1072                 farCamera->setCullMaskLeft(nm);
1073                 farCamera->setCullMaskRight(nm);
1074             } else {
1075                 camera->setCullMask(nm);
1076                 camera->setCullMaskLeft(nm);
1077                 camera->setCullMaskRight(nm);
1078             }
1079         } else {
1080             camera = info->getCamera( GEOMETRY_CAMERA );
1081             if (camera == 0) continue;
1082             camera->setCullMask( nm & ~simgear::MODELLIGHT_BIT );
1083         }
1084     }
1085 }
1086
1087 void CameraGroup::resized()
1088 {
1089     for (CameraIterator i = camerasBegin(), e = camerasEnd(); i != e; ++i) {
1090         CameraInfo *info = i->get();
1091         Camera* camera = info->getCamera( MAIN_CAMERA );
1092         if ( camera == 0 )
1093             camera = info->getCamera( DISPLAY_CAMERA );
1094         const Viewport* viewport = camera->getViewport();
1095         info->x = viewport->x();
1096         info->y = viewport->y();
1097         info->width = viewport->width();
1098         info->height = viewport->height();
1099
1100         info->resized( info->width, info->height );
1101     }
1102 }
1103
1104 const CameraInfo* CameraGroup::getGUICamera() const
1105 {
1106     ConstCameraIterator result
1107         = std::find_if(camerasBegin(), camerasEnd(),
1108                    FlagTester<CameraInfo>(GUI));
1109     if (result == camerasEnd()) {
1110         return NULL;
1111     }
1112
1113     return *result;
1114 }
1115
1116 Camera* getGUICamera(CameraGroup* cgroup)
1117 {
1118     const CameraInfo* info = cgroup->getGUICamera();
1119     if (!info) {
1120         return NULL;
1121     }
1122
1123     return info->getCamera(MAIN_CAMERA);
1124 }
1125
1126 static bool computeCameraIntersection(const CameraInfo* cinfo,
1127                                       const osgGA::GUIEventAdapter* ea,
1128                                       osgUtil::LineSegmentIntersector::Intersections& intersections)
1129 {
1130   using osgUtil::Intersector;
1131   using osgUtil::LineSegmentIntersector;
1132   double x, y;
1133   eventToWindowCoords(ea, x, y);
1134
1135   if (!(cinfo->flags & CameraGroup::DO_INTERSECTION_TEST))
1136     return false;
1137
1138   const Camera* camera = cinfo->getCamera(MAIN_CAMERA);
1139   if ( !camera )
1140     camera = cinfo->getCamera( GEOMETRY_CAMERA );
1141   if (camera->getGraphicsContext() != ea->getGraphicsContext())
1142     return false;
1143
1144   const Viewport* viewport = camera->getViewport();
1145   double epsilon = 0.5;
1146   if (!(x >= viewport->x() - epsilon
1147         && x < viewport->x() + viewport->width() -1.0 + epsilon
1148         && y >= viewport->y() - epsilon
1149         && y < viewport->y() + viewport->height() -1.0 + epsilon))
1150     return false;
1151
1152   Vec4d start(x, y, 0.0, 1.0);
1153   Vec4d end(x, y, 1.0, 1.0);
1154   Matrix windowMat = viewport->computeWindowMatrix();
1155   Matrix startPtMat = Matrix::inverse(camera->getProjectionMatrix()
1156                                       * windowMat);
1157   Matrix endPtMat;
1158   const Camera* farCamera = cinfo->getCamera( FAR_CAMERA );
1159   if (!farCamera || farCamera->getNodeMask() == 0)
1160     endPtMat = startPtMat;
1161   else
1162     endPtMat = Matrix::inverse(farCamera->getProjectionMatrix()
1163                                * windowMat);
1164   start = start * startPtMat;
1165   start /= start.w();
1166   end = end * endPtMat;
1167   end /= end.w();
1168   ref_ptr<LineSegmentIntersector> picker
1169   = new LineSegmentIntersector(Intersector::VIEW,
1170                                Vec3d(start.x(), start.y(), start.z()),
1171                                Vec3d(end.x(), end.y(), end.z()));
1172   osgUtil::IntersectionVisitor iv(picker.get());
1173   iv.setTraversalMask( ~simgear::MODELLIGHT_BIT );
1174   const_cast<Camera*>(camera)->accept(iv);
1175   if (picker->containsIntersections()) {
1176     intersections = picker->getIntersections();
1177     return true;
1178   }
1179
1180   return false;
1181 }
1182
1183 bool computeIntersections(const CameraGroup* cgroup,
1184                           const osgGA::GUIEventAdapter* ea,
1185                           osgUtil::LineSegmentIntersector::Intersections& intersections)
1186 {
1187     // test the GUI first
1188     const CameraInfo* guiCamera = cgroup->getGUICamera();
1189     if (guiCamera && computeCameraIntersection(guiCamera, ea, intersections))
1190         return true;
1191
1192     // Find camera that contains event
1193     for (CameraGroup::ConstCameraIterator iter = cgroup->camerasBegin(),
1194              e = cgroup->camerasEnd();
1195          iter != e;
1196          ++iter) {
1197         const CameraInfo* cinfo = iter->get();
1198         if (cinfo == guiCamera)
1199             continue;
1200
1201         if (computeCameraIntersection(cinfo, ea, intersections))
1202             return true;
1203     }
1204
1205     intersections.clear();
1206     return false;
1207 }
1208
1209 void warpGUIPointer(CameraGroup* cgroup, int x, int y)
1210 {
1211     using osgViewer::GraphicsWindow;
1212     Camera* guiCamera = getGUICamera(cgroup);
1213     if (!guiCamera)
1214         return;
1215     Viewport* vport = guiCamera->getViewport();
1216     GraphicsWindow* gw
1217         = dynamic_cast<GraphicsWindow*>(guiCamera->getGraphicsContext());
1218     if (!gw)
1219         return;
1220     globals->get_renderer()->getEventHandler()->setMouseWarped();
1221     // Translate the warp request into the viewport of the GUI camera,
1222     // send the request to the window, then transform the coordinates
1223     // for the Viewer's event queue.
1224     double wx = x + vport->x();
1225     double wyUp = vport->height() + vport->y() - y;
1226     double wy;
1227     const GraphicsContext::Traits* traits = gw->getTraits();
1228     if (gw->getEventQueue()->getCurrentEventState()->getMouseYOrientation()
1229         == osgGA::GUIEventAdapter::Y_INCREASING_DOWNWARDS) {
1230         wy = traits->height - wyUp;
1231     } else {
1232         wy = wyUp;
1233     }
1234     gw->getEventQueue()->mouseWarped(wx, wy);
1235     gw->requestWarpPointer(wx, wy);
1236     osgGA::GUIEventAdapter* eventState
1237         = cgroup->getViewer()->getEventQueue()->getCurrentEventState();
1238     double viewerX
1239         = (eventState->getXmin()
1240            + ((wx / double(traits->width))
1241               * (eventState->getXmax() - eventState->getXmin())));
1242     double viewerY
1243         = (eventState->getYmin()
1244            + ((wyUp / double(traits->height))
1245               * (eventState->getYmax() - eventState->getYmin())));
1246     cgroup->getViewer()->getEventQueue()->mouseWarped(viewerX, viewerY);
1247 }
1248 }