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