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 #include <simgear/scene/tgdb/userdata.hxx>
  36
  37 #include <algorithm>
  38 #include <cstring>
  39 #include <string>
  40
  41 #include <osg/Camera>
  42 #include <osg/Geometry>
  43 #include <osg/GraphicsContext>
  44 #include <osg/io_utils>
  45 #include <osg/Math>
  46 #include <osg/Matrix>
  47 #include <osg/Notify>
  48 #include <osg/Program>
  49 #include <osg/Quat>
  50 #include <osg/TexMat>
  51 #include <osg/Vec3d>
  52 #include <osg/Viewport>
  53
  54 #include <osgUtil/IntersectionVisitor>
  55
  56 #include <osgViewer/GraphicsWindow>
  57 #include <osgViewer/Renderer>
  58
  59 namespace flightgear {
  60 const char* MAIN_CAMERA = "MAIN_CAMERA";
  61 const char* FAR_CAMERA = "FAR_CAMERA";
  62 const char* GEOMETRY_CAMERA = "GEOMETRY_CAMERA";
  63 const char* SHADOW_CAMERA = "SHADOW_CAMERA";
  64 const char* LIGHTING_CAMERA = "LIGHTING_CAMERA";
  65 const char* DISPLAY_CAMERA = "DISPLAY_CAMERA";
  66 }
  67
  68 static osg::Matrix
  69 invert(const osg::Matrix& matrix)
  70 {
  71     return osg::Matrix::inverse(matrix);
  72 }
  73
  74 /// Returns the zoom factor of the master camera.
  75 /// The reference fov is the historic 55 deg
  76 static double
  77 zoomFactor()
  78 {
  79     double fov = fgGetDouble("/sim/current-view/field-of-view", 55);
  80     if (fov < 1)
  81         fov = 1;
  82     return tan(55*0.5*SG_DEGREES_TO_RADIANS)/tan(fov*0.5*SG_DEGREES_TO_RADIANS);
  83 }
  84
  85 static osg::Vec2d
  86 preMult(const osg::Vec2d& v, const osg::Matrix& m)
  87 {
  88   osg::Vec3d tmp = m.preMult(osg::Vec3(v, 0));
  89   return osg::Vec2d(tmp[0], tmp[1]);
  90 }
  91
  92 static osg::Matrix
  93 relativeProjection(const osg::Matrix& P0, const osg::Matrix& R, const osg::Vec2d ref[2],
  94                    const osg::Matrix& pP, const osg::Matrix& pR, const osg::Vec2d pRef[2])
  95 {
  96   // Track the way from one projection space to the other:
  97   // We want
  98   //  P = T*S*P0
  99   // where P0 is the projection template sensible for the given window size,
 100   // T is a translation matrix and S a scale matrix.
 101   // We need to determine T and S so that the reference points in the parents
 102   // projection space match the two reference points in this cameras projection space.
 103
 104   // Starting from the parents camera projection space, we get into this cameras
 105   // projection space by the transform matrix:
 106   //  P*R*inv(pP*pR) = T*S*P0*R*inv(pP*pR)
 107   // So, at first compute that matrix without T*S and determine S and T from that
 108
 109   // Ok, now osg uses the inverse matrix multiplication order, thus:
 110   osg::Matrix PtoPwithoutTS = invert(pR*pP)*R*P0;
 111   // Compute the parents reference points in the current projection space
 112   // without the yet unknown T and S
 113   osg::Vec2d pRefInThis[2] = {
 114     preMult(pRef[0], PtoPwithoutTS),
 115     preMult(pRef[1], PtoPwithoutTS)
 116   };
 117
 118   // To get the same zoom, rescale to match the parents size
 119   double s = (ref[0] - ref[1]).length()/(pRefInThis[0] - pRefInThis[1]).length();
 120   osg::Matrix S = osg::Matrix::scale(s, s, 1);
 121
 122   // For the translation offset, incorporate the now known scale
 123   // and recompute the position ot the first reference point in the
 124   // currents projection space without the yet unknown T.
 125   pRefInThis[0] = preMult(pRef[0], PtoPwithoutTS*S);
 126   // The translation is then the difference of the reference points
 127   osg::Matrix T = osg::Matrix::translate(osg::Vec3d(ref[0] - pRefInThis[0], 0));
 128
 129   // Compose and return the desired final projection matrix
 130   return P0*S*T;
 131 }
 132
 133 namespace flightgear
 134 {
 135 using namespace osg;
 136
 137 using std::strcmp;
 138 using std::string;
 139
 140 ref_ptr<CameraGroup> CameraGroup::_defaultGroup;
 141
 142 CameraGroup::CameraGroup(osgViewer::Viewer* viewer) :
 143     _viewer(viewer)
 144 {
 145 }
 146
 147 }
 148
 149 namespace
 150 {
 151 using namespace osg;
 152
 153 // Given a projection matrix, return a new one with the same frustum
 154 // sides and new near / far values.
 155
 156 void makeNewProjMat(Matrixd& oldProj, double znear,
 157                                        double zfar, Matrixd& projection)
 158 {
 159     projection = oldProj;
 160     // Slightly inflate the near & far planes to avoid objects at the
 161     // extremes being clipped out.
 162     znear *= 0.999;
 163     zfar *= 1.001;
 164
 165     // Clamp the projection matrix z values to the range (near, far)
 166     double epsilon = 1.0e-6;
 167     if (fabs(projection(0,3)) < epsilon &&
 168         fabs(projection(1,3)) < epsilon &&
 169         fabs(projection(2,3)) < epsilon) {
 170         // Projection is Orthographic
 171         epsilon = -1.0/(zfar - znear); // Used as a temp variable
 172         projection(2,2) = 2.0*epsilon;
 173         projection(3,2) = (zfar + znear)*epsilon;
 174     } else {
 175         // Projection is Perspective
 176         double trans_near = (-znear*projection(2,2) + projection(3,2)) /
 177             (-znear*projection(2,3) + projection(3,3));
 178         double trans_far = (-zfar*projection(2,2) + projection(3,2)) /
 179             (-zfar*projection(2,3) + projection(3,3));
 180         double ratio = fabs(2.0/(trans_near - trans_far));
 181         double center = -0.5*(trans_near + trans_far);
 182
 183         projection.postMult(osg::Matrixd(1.0, 0.0, 0.0, 0.0,
 184                                          0.0, 1.0, 0.0, 0.0,
 185                                          0.0, 0.0, ratio, 0.0,
 186                                          0.0, 0.0, center*ratio, 1.0));
 187     }
 188 }
 189 }
 190
 191 namespace flightgear
 192 {
 193 void CameraInfo::updateCameras()
 194 {
 195     bufferSize->set( osg::Vec2f( width, height ) );
 196
 197     for (CameraMap::iterator ii = cameras.begin(); ii != cameras.end(); ++ii ) {
 198         float f = ii->second.scaleFactor;
 199         if ( f == 0.0f ) continue;
 200         ii->second.camera->getViewport()->setViewport(x*f, y*f, width*f, height*f);
 201     }
 202
 203     for (RenderBufferMap::iterator ii = buffers.begin(); ii != buffers.end(); ++ii ) {
 204         float f = ii->second.scaleFactor;
 205         if ( f == 0.0f ) continue;
 206         osg::Texture2D* texture = ii->second.texture.get();
 207         if ( texture->getTextureHeight() != height*f || texture->getTextureWidth() != width*f ) {
 208             texture->setTextureSize( width*f, height*f );
 209             texture->dirtyTextureObject();
 210         }
 211     }
 212 }
 213
 214 void CameraInfo::resized(double w, double h)
 215 {
 216     bufferSize->set( osg::Vec2f( w, h ) );
 217
 218     for (RenderBufferMap::iterator ii = buffers.begin(); ii != buffers.end(); ++ii) {
 219         float s = ii->second.scaleFactor;
 220         if ( s == 0.0f ) continue;
 221         ii->second.texture->setTextureSize( w * s, h * s );
 222         ii->second.texture->dirtyTextureObject();
 223     }
 224
 225     for (CameraMap::iterator ii = cameras.begin(); ii != cameras.end(); ++ii) {
 226         RenderStageInfo& rsi = ii->second;
 227         if (!rsi.resizable ||
 228                 rsi.camera->getRenderTargetImplementation() != osg::Camera::FRAME_BUFFER_OBJECT ||
 229                 rsi.scaleFactor == 0.0f )
 230             continue;
 231
 232         Viewport* vp = rsi.camera->getViewport();
 233         vp->width() = w * rsi.scaleFactor;
 234         vp->height() = h * rsi.scaleFactor;
 235
 236         osgViewer::Renderer* renderer
 237             = static_cast<osgViewer::Renderer*>(rsi.camera->getRenderer());
 238         for (int i = 0; i < 2; ++i) {
 239             osgUtil::SceneView* sceneView = renderer->getSceneView(i);
 240             sceneView->getRenderStage()->setFrameBufferObject(0);
 241             sceneView->getRenderStage()->setCameraRequiresSetUp(true);
 242             if (sceneView->getRenderStageLeft()) {
 243                 sceneView->getRenderStageLeft()->setFrameBufferObject(0);
 244                 sceneView->getRenderStageLeft()->setCameraRequiresSetUp(true);
 245             }
 246             if (sceneView->getRenderStageRight()) {
 247                 sceneView->getRenderStageRight()->setFrameBufferObject(0);
 248                 sceneView->getRenderStageRight()->setCameraRequiresSetUp(true);
 249             }
 250         }
 251     }
 252 }
 253
 254 osg::Camera* CameraInfo::getCamera(const std::string& k) const
 255 {
 256     CameraMap::const_iterator ii = cameras.find( k );
 257     if (ii == cameras.end())
 258         return 0;
 259     return ii->second.camera.get();
 260 }
 261
 262 osg::Texture2D* CameraInfo::getBuffer(const std::string& k) const
 263 {
 264     RenderBufferMap::const_iterator ii = buffers.find(k);
 265     if (ii == buffers.end())
 266         return 0;
 267     return ii->second.texture.get();
 268 }
 269
 270 int CameraInfo::getMainSlaveIndex() const
 271 {
 272     return cameras.find( MAIN_CAMERA )->second.slaveIndex;
 273 }
 274
 275 void CameraInfo::setMatrices(osg::Camera* c)
 276 {
 277     view->set( c->getViewMatrix() );
 278     viewInverse->set( osg::Matrix::inverse( c->getViewMatrix() ) );
 279     projInverse->set( osg::Matrix::inverse( c->getProjectionMatrix() ) );
 280 }
 281
 282 void CameraGroup::update(const osg::Vec3d& position,
 283                          const osg::Quat& orientation)
 284 {
 285     const Matrix masterView(osg::Matrix::translate(-position)
 286                             * osg::Matrix::rotate(orientation.inverse()));
 287     _viewer->getCamera()->setViewMatrix(masterView);
 288     const Matrix& masterProj = _viewer->getCamera()->getProjectionMatrix();
 289     double masterZoomFactor = zoomFactor();
 290     for (CameraList::iterator i = _cameras.begin(); i != _cameras.end(); ++i) {
 291         const CameraInfo* info = i->get();
 292
 293         Camera* camera = info->getCamera(MAIN_CAMERA);
 294         if ( camera ) {
 295             const View::Slave& slave = _viewer->getSlave(info->getMainSlaveIndex());
 296 #if SG_OSG_VERSION_LESS_THAN(3,0,0)
 297             // refreshes camera viewports (for now)
 298             info->updateCameras();
 299 #endif
 300             Matrix viewMatrix;
 301             if (info->flags & GUI) {
 302                 viewMatrix = osg::Matrix(); // identifty transform on the GUI camera
 303             } else if ((info->flags & VIEW_ABSOLUTE) != 0)
 304                 viewMatrix = slave._viewOffset;
 305             else
 306                 viewMatrix = masterView * slave._viewOffset;
 307             camera->setViewMatrix(viewMatrix);
 308             Matrix projectionMatrix;
 309             if (info->flags & GUI) {
 310                 projectionMatrix = osg::Matrix::ortho2D(0, info->width, 0, info->height);
 311             } else if ((info->flags & PROJECTION_ABSOLUTE) != 0) {
 312                 if (info->flags & ENABLE_MASTER_ZOOM) {
 313                     if (info->relativeCameraParent < _cameras.size()) {
 314                         // template projection matrix and view matrix of the current camera
 315                         osg::Matrix P0 = slave._projectionOffset;
 316                         osg::Matrix R = viewMatrix;
 317
 318                         // The already known projection and view matrix of the parent camera
 319                         const CameraInfo* parentInfo = _cameras[info->relativeCameraParent].get();
 320                         RenderStageInfo prsi = parentInfo->cameras.find(MAIN_CAMERA)->second;
 321                         osg::Matrix pP = prsi.camera->getProjectionMatrix();
 322                         osg::Matrix pR = prsi.camera->getViewMatrix();
 323
 324                         // And the projection matrix derived from P0 so that the reference points match
 325                         projectionMatrix = relativeProjection(P0, R, info->thisReference,
 326                                                               pP, pR, info->parentReference);
 327
 328                     } else {
 329                         // We want to zoom, so take the original matrix and apply the zoom to it.
 330                         projectionMatrix = slave._projectionOffset;
 331                         projectionMatrix.postMultScale(osg::Vec3d(masterZoomFactor, masterZoomFactor, 1));
 332                     }
 333                 } else {
 334                     projectionMatrix = slave._projectionOffset;
 335                 }
 336             } else {
 337                 projectionMatrix = masterProj * slave._projectionOffset;
 338             }
 339
 340             CameraMap::const_iterator ii = info->cameras.find(FAR_CAMERA);
 341             if (ii == info->cameras.end() || !ii->second.camera.valid()) {
 342                 camera->setProjectionMatrix(projectionMatrix);
 343             } else {
 344                 Camera* farCamera = ii->second.camera;
 345                 farCamera->setViewMatrix(viewMatrix);
 346                 double left, right, bottom, top, parentNear, parentFar;
 347                 projectionMatrix.getFrustum(left, right, bottom, top,
 348                                             parentNear, parentFar);
 349                 if ((info->flags & FIXED_NEAR_FAR) == 0) {
 350                     parentNear = _zNear;
 351                     parentFar = _zFar;
 352                 }
 353                 if (parentFar < _nearField || _nearField == 0.0f) {
 354                     camera->setProjectionMatrix(projectionMatrix);
 355                     camera->setCullMask(camera->getCullMask()
 356                                         | simgear::BACKGROUND_BIT);
 357                     camera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
 358                     farCamera->setNodeMask(0);
 359                 } else {
 360                     Matrix nearProj, farProj;
 361                     makeNewProjMat(projectionMatrix, parentNear, _nearField,
 362                                    nearProj);
 363                     makeNewProjMat(projectionMatrix, _nearField, parentFar,
 364                                    farProj);
 365                     camera->setProjectionMatrix(nearProj);
 366                     camera->setCullMask(camera->getCullMask()
 367                                         & ~simgear::BACKGROUND_BIT);
 368                     camera->setClearMask(GL_DEPTH_BUFFER_BIT);
 369                     farCamera->setProjectionMatrix(farProj);
 370                     farCamera->setNodeMask(camera->getNodeMask());
 371                 }
 372             }
 373         } else {
 374             bool viewDone = false;
 375             Matrix viewMatrix;
 376             bool projectionDone = false;
 377             Matrix projectionMatrix;
 378             for ( CameraMap::const_iterator ii = info->cameras.begin(); ii != info->cameras.end(); ++ii ) {
 379                 if ( ii->first == SHADOW_CAMERA ) {
 380                     globals->get_renderer()->updateShadowCamera(info, position);
 381                     continue;
 382                 }
 383                 if ( ii->second.fullscreen )
 384                     continue;
 385
 386                 Camera* camera = ii->second.camera.get();
 387                 int slaveIndex = ii->second.slaveIndex;
 388                 const View::Slave& slave = _viewer->getSlave(slaveIndex);
 389
 390                 if ( !viewDone ) {
 391                     if ((info->flags & VIEW_ABSOLUTE) != 0)
 392                         viewMatrix = slave._viewOffset;
 393                     else
 394                         viewMatrix = masterView * slave._viewOffset;
 395                     viewDone = true;
 396                 }
 397
 398                 camera->setViewMatrix( viewMatrix );
 399
 400                 if ( !projectionDone ) {
 401                     if ((info->flags & PROJECTION_ABSOLUTE) != 0) {
 402                         if (info->flags & ENABLE_MASTER_ZOOM) {
 403                             if (info->relativeCameraParent < _cameras.size()) {
 404                                 // template projection matrix and view matrix of the current camera
 405                                 osg::Matrix P0 = slave._projectionOffset;
 406                                 osg::Matrix R = viewMatrix;
 407
 408                                 // The already known projection and view matrix of the parent camera
 409                                 const CameraInfo* parentInfo = _cameras[info->relativeCameraParent].get();
 410                                 RenderStageInfo prsi = parentInfo->cameras.find(MAIN_CAMERA)->second;
 411                                 osg::Matrix pP = prsi.camera->getProjectionMatrix();
 412                                 osg::Matrix pR = prsi.camera->getViewMatrix();
 413
 414                                 // And the projection matrix derived from P0 so that the reference points match
 415                                 projectionMatrix = relativeProjection(P0, R, info->thisReference,
 416                                                                       pP, pR, info->parentReference);
 417
 418                             } else {
 419                                 // We want to zoom, so take the original matrix and apply the zoom to it.
 420                                 projectionMatrix = slave._projectionOffset;
 421                                 projectionMatrix.postMultScale(osg::Vec3d(masterZoomFactor, masterZoomFactor, 1));
 422                             }
 423                         } else {
 424                             projectionMatrix = slave._projectionOffset;
 425                         }
 426                     } else {
 427                         projectionMatrix = masterProj * slave._projectionOffset;
 428                     }
 429                     projectionDone = true;
 430                 }
 431
 432                 camera->setProjectionMatrix(projectionMatrix);
 433             }
 434         }
 435     }
 436
 437     globals->get_renderer()->setPlanes( _zNear, _zFar );
 438 }
 439
 440 void CameraGroup::setCameraParameters(float vfov, float aspectRatio)
 441 {
 442     if (vfov != 0.0f && aspectRatio != 0.0f)
 443         _viewer->getCamera()
 444             ->setProjectionMatrixAsPerspective(vfov,
 445                                                1.0f / aspectRatio,
 446                                                _zNear, _zFar);
 447 }
 448
 449 double CameraGroup::getMasterAspectRatio() const
 450 {
 451     if (_cameras.empty())
 452         return 0.0;
 453
 454     const CameraInfo* info = _cameras.front();
 455
 456     osg::Camera* camera = info->getCamera(MAIN_CAMERA);
 457     if ( !camera )
 458         camera = info->getCamera( GEOMETRY_CAMERA );
 459     const osg::Viewport* viewport = camera->getViewport();
 460     if (!viewport) {
 461         return 0.0;
 462     }
 463
 464     return static_cast<double>(viewport->height()) / viewport->width();
 465 }
 466
 467 }
 468
 469 namespace
 470 {
 471 // A raw value for property nodes that references a class member via
 472 // an osg::ref_ptr.
 473 template<class C, class T>
 474 class RefMember : public SGRawValue<T>
 475 {
 476 public:
 477     RefMember (C *obj, T C::*ptr)
 478         : _obj(obj), _ptr(ptr) {}
 479     virtual ~RefMember () {}
 480     virtual T getValue () const
 481     {
 482         return _obj.get()->*_ptr;
 483     }
 484     virtual bool setValue (T value)
 485     {
 486         _obj.get()->*_ptr = value;
 487         return true;
 488     }
 489     virtual SGRawValue<T> * clone () const
 490     {
 491         return new RefMember(_obj.get(), _ptr);
 492     }
 493 private:
 494     ref_ptr<C> _obj;
 495     T C::* const _ptr;
 496 };
 497
 498 template<typename C, typename T>
 499 RefMember<C, T> makeRefMember(C *obj, T C::*ptr)
 500 {
 501     return RefMember<C, T>(obj, ptr);
 502 }
 503
 504 template<typename C, typename T>
 505 void bindMemberToNode(SGPropertyNode* parent, const char* childName,
 506                       C* obj, T C::*ptr, T value)
 507 {
 508     SGPropertyNode* valNode = parent->getNode(childName);
 509     RefMember<C, T> refMember = makeRefMember(obj, ptr);
 510     if (!valNode) {
 511         valNode = parent->getNode(childName, true);
 512         valNode->tie(refMember, false);
 513         setValue(valNode, value);
 514     } else {
 515         valNode->tie(refMember, true);
 516     }
 517 }
 518
 519 void buildViewport(flightgear::CameraInfo* info, SGPropertyNode* viewportNode,
 520                    const osg::GraphicsContext::Traits *traits)
 521 {
 522     using namespace flightgear;
 523     bindMemberToNode(viewportNode, "x", info, &CameraInfo::x, 0.0);
 524     bindMemberToNode(viewportNode, "y", info, &CameraInfo::y, 0.0);
 525     bindMemberToNode(viewportNode, "width", info, &CameraInfo::width,
 526                      static_cast<double>(traits->width));
 527     bindMemberToNode(viewportNode, "height", info, &CameraInfo::height,
 528                      static_cast<double>(traits->height));
 529 }
 530 }
 531
 532 namespace flightgear
 533 {
 534
 535 // Mostly copied from osg's osgViewer/View.cpp
 536
 537 static osg::Geometry* createPanoramicSphericalDisplayDistortionMesh(
 538     const Vec3& origin, const Vec3& widthVector, const Vec3& heightVector,
 539     double sphere_radius, double collar_radius,
 540     Image* intensityMap = 0, const Matrix& projectorMatrix = Matrix())
 541 {
 542     osg::Vec3d center(0.0,0.0,0.0);
 543     osg::Vec3d eye(0.0,0.0,0.0);
 544
 545     double distance = sqrt(sphere_radius*sphere_radius - collar_radius*collar_radius);
 546     bool flip = false;
 547     bool texcoord_flip = false;
 548
 549 #if 0
 550     osg::Vec3d projector = eye - osg::Vec3d(0.0,0.0, distance);
 551
 552     OSG_INFO<<"createPanoramicSphericalDisplayDistortionMesh : Projector position = "<<projector<<std::endl;
 553     OSG_INFO<<"createPanoramicSphericalDisplayDistortionMesh : distance = "<<distance<<std::endl;
 554 #endif
 555     // create the quad to visualize.
 556     osg::Geometry* geometry = new osg::Geometry();
 557
 558     geometry->setSupportsDisplayList(false);
 559
 560     osg::Vec3 xAxis(widthVector);
 561     float width = widthVector.length();
 562     xAxis /= width;
 563
 564     osg::Vec3 yAxis(heightVector);
 565     float height = heightVector.length();
 566     yAxis /= height;
 567
 568     int noSteps = 160;
 569
 570     osg::Vec3Array* vertices = new osg::Vec3Array;
 571     osg::Vec2Array* texcoords0 = new osg::Vec2Array;
 572     osg::Vec2Array* texcoords1 = intensityMap==0 ? new osg::Vec2Array : 0;
 573     osg::Vec4Array* colors = new osg::Vec4Array;
 574
 575 #if 0
 576     osg::Vec3 bottom = origin;
 577     osg::Vec3 dx = xAxis*(width/((float)(noSteps-2)));
 578     osg::Vec3 dy = yAxis*(height/((float)(noSteps-1)));
 579 #endif
 580     osg::Vec3 top = origin + yAxis*height;
 581
 582     osg::Vec3 screenCenter = origin + widthVector*0.5f + heightVector*0.5f;
 583     float screenRadius = heightVector.length() * 0.5f;
 584
 585     geometry->getOrCreateStateSet()->setMode(GL_CULL_FACE, osg::StateAttribute::OFF | osg::StateAttribute::PROTECTED);
 586
 587     for(int i=0;i<noSteps;++i)
 588     {
 589         //osg::Vec3 cursor = bottom+dy*(float)i;
 590         for(int j=0;j<noSteps;++j)
 591         {
 592             osg::Vec2 texcoord(double(i)/double(noSteps-1), double(j)/double(noSteps-1));
 593             double theta = texcoord.x() * 2.0 * osg::PI;
 594             double phi = (1.0-texcoord.y()) * osg::PI;
 595
 596             if (texcoord_flip) texcoord.y() = 1.0f - texcoord.y();
 597
 598             osg::Vec3 pos(sin(phi)*sin(theta), sin(phi)*cos(theta), cos(phi));
 599             pos = pos*projectorMatrix;
 600
 601             double alpha = atan2(pos.x(), pos.y());
 602             if (alpha<0.0) alpha += 2.0*osg::PI;
 603
 604             double beta = atan2(sqrt(pos.x()*pos.x() + pos.y()*pos.y()), pos.z());
 605             if (beta<0.0) beta += 2.0*osg::PI;
 606
 607             double gamma = atan2(sqrt(double(pos.x()*pos.x() + pos.y()*pos.y())), double(pos.z()+distance));
 608             if (gamma<0.0) gamma += 2.0*osg::PI;
 609
 610
 611             osg::Vec3 v = screenCenter + osg::Vec3(sin(alpha)*gamma*2.0/osg::PI, -cos(alpha)*gamma*2.0/osg::PI, 0.0f)*screenRadius;
 612
 613             if (flip)
 614                 vertices->push_back(osg::Vec3(v.x(), top.y()-(v.y()-origin.y()),v.z()));
 615             else
 616                 vertices->push_back(v);
 617
 618             texcoords0->push_back( texcoord );
 619
 620             osg::Vec2 texcoord1(alpha/(2.0*osg::PI), 1.0f - beta/osg::PI);
 621             if (intensityMap)
 622             {
 623                 colors->push_back(intensityMap->getColor(texcoord1));
 624             }
 625             else
 626             {
 627                 colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
 628                 if (texcoords1) texcoords1->push_back( texcoord1 );
 629             }
 630
 631
 632         }
 633     }
 634
 635
 636     // pass the created vertex array to the points geometry object.
 637     geometry->setVertexArray(vertices);
 638
 639     geometry->setColorArray(colors);
 640     geometry->setColorBinding(osg::Geometry::BIND_PER_VERTEX);
 641
 642     geometry->setTexCoordArray(0,texcoords0);
 643     if (texcoords1) geometry->setTexCoordArray(1,texcoords1);
 644
 645     osg::DrawElementsUShort* elements = new osg::DrawElementsUShort(osg::PrimitiveSet::TRIANGLES);
 646     geometry->addPrimitiveSet(elements);
 647
 648     for(int i=0;i<noSteps-1;++i)
 649     {
 650         for(int j=0;j<noSteps-1;++j)
 651         {
 652             int i1 = j+(i+1)*noSteps;
 653             int i2 = j+(i)*noSteps;
 654             int i3 = j+1+(i)*noSteps;
 655             int i4 = j+1+(i+1)*noSteps;
 656
 657             osg::Vec3& v1 = (*vertices)[i1];
 658             osg::Vec3& v2 = (*vertices)[i2];
 659             osg::Vec3& v3 = (*vertices)[i3];
 660             osg::Vec3& v4 = (*vertices)[i4];
 661
 662             if ((v1-screenCenter).length()>screenRadius) continue;
 663             if ((v2-screenCenter).length()>screenRadius) continue;
 664             if ((v3-screenCenter).length()>screenRadius) continue;
 665             if ((v4-screenCenter).length()>screenRadius) continue;
 666
 667             elements->push_back(i1);
 668             elements->push_back(i2);
 669             elements->push_back(i3);
 670
 671             elements->push_back(i1);
 672             elements->push_back(i3);
 673             elements->push_back(i4);
 674         }
 675     }
 676
 677     return geometry;
 678 }
 679
 680 void CameraGroup::buildDistortionCamera(const SGPropertyNode* psNode,
 681                                         Camera* camera)
 682 {
 683     const SGPropertyNode* texNode = psNode->getNode("texture");
 684     if (!texNode) {
 685         // error
 686         return;
 687     }
 688     string texName = texNode->getStringValue();
 689     TextureMap::iterator itr = _textureTargets.find(texName);
 690     if (itr == _textureTargets.end()) {
 691         // error
 692         return;
 693     }
 694     Viewport* viewport = camera->getViewport();
 695     float width = viewport->width();
 696     float height = viewport->height();
 697     TextureRectangle* texRect = itr->second.get();
 698     double radius = psNode->getDoubleValue("radius", 1.0);
 699     double collar = psNode->getDoubleValue("collar", 0.45);
 700     Geode* geode = new Geode();
 701     geode->addDrawable(createPanoramicSphericalDisplayDistortionMesh(
 702                            Vec3(0.0f,0.0f,0.0f), Vec3(width,0.0f,0.0f),
 703                            Vec3(0.0f,height,0.0f), radius, collar));
 704
 705     // new we need to add the texture to the mesh, we do so by creating a
 706     // StateSet to contain the Texture StateAttribute.
 707     StateSet* stateset = geode->getOrCreateStateSet();
 708     stateset->setTextureAttributeAndModes(0, texRect, StateAttribute::ON);
 709     stateset->setMode(GL_LIGHTING, StateAttribute::OFF);
 710
 711     TexMat* texmat = new TexMat;
 712     texmat->setScaleByTextureRectangleSize(true);
 713     stateset->setTextureAttributeAndModes(0, texmat, osg::StateAttribute::ON);
 714 #if 0
 715     if (!applyIntensityMapAsColours && intensityMap)
 716     {
 717         stateset->setTextureAttributeAndModes(1, new osg::Texture2D(intensityMap), osg::StateAttribute::ON);
 718     }
 719 #endif
 720     // add subgraph to render
 721     camera->addChild(geode);
 722     camera->setClearMask(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
 723     camera->setClearColor(osg::Vec4(0.0, 0.0, 0.0, 1.0));
 724     camera->setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR);
 725     camera->setCullingMode(osg::CullSettings::NO_CULLING);
 726     camera->setName("DistortionCorrectionCamera");
 727 }
 728
 729 CameraInfo* CameraGroup::buildCamera(SGPropertyNode* cameraNode)
 730 {
 731     WindowBuilder *wBuild = WindowBuilder::getWindowBuilder();
 732     const SGPropertyNode* windowNode = cameraNode->getNode("window");
 733     GraphicsWindow* window = 0;
 734     int cameraFlags = DO_INTERSECTION_TEST;
 735     if (windowNode) {
 736         // New style window declaration / definition
 737         window = wBuild->buildWindow(windowNode);
 738     } else {
 739         // Old style: suck window params out of camera block
 740         window = wBuild->buildWindow(cameraNode);
 741     }
 742     if (!window) {
 743         return 0;
 744     }
 745     Camera* camera = new Camera;
 746     camera->setAllowEventFocus(false);
 747     camera->setGraphicsContext(window->gc.get());
 748     camera->setViewport(new Viewport);
 749     camera->setCullingMode(CullSettings::SMALL_FEATURE_CULLING
 750                            | CullSettings::VIEW_FRUSTUM_CULLING);
 751     camera->setInheritanceMask(CullSettings::ALL_VARIABLES
 752                                & ~(CullSettings::CULL_MASK
 753                                    | CullSettings::CULLING_MODE
 754 #if defined(HAVE_CULLSETTINGS_CLEAR_MASK)
 755                                    | CullSettings::CLEAR_MASK
 756 #endif
 757                                    ));
 758
 759     osg::Matrix vOff;
 760     const SGPropertyNode* viewNode = cameraNode->getNode("view");
 761     if (viewNode) {
 762         double heading = viewNode->getDoubleValue("heading-deg", 0.0);
 763         double pitch = viewNode->getDoubleValue("pitch-deg", 0.0);
 764         double roll = viewNode->getDoubleValue("roll-deg", 0.0);
 765         double x = viewNode->getDoubleValue("x", 0.0);
 766         double y = viewNode->getDoubleValue("y", 0.0);
 767         double z = viewNode->getDoubleValue("z", 0.0);
 768         // Build a view matrix, which is the inverse of a model
 769         // orientation matrix.
 770         vOff = (Matrix::translate(-x, -y, -z)
 771                 * Matrix::rotate(-DegreesToRadians(heading),
 772                                  Vec3d(0.0, 1.0, 0.0),
 773                                  -DegreesToRadians(pitch),
 774                                  Vec3d(1.0, 0.0, 0.0),
 775                                  -DegreesToRadians(roll),
 776                                  Vec3d(0.0, 0.0, 1.0)));
 777         if (viewNode->getBoolValue("absolute", false))
 778             cameraFlags |= VIEW_ABSOLUTE;
 779     } else {
 780         // Old heading parameter, works in the opposite direction
 781         double heading = cameraNode->getDoubleValue("heading-deg", 0.0);
 782         vOff.makeRotate(DegreesToRadians(heading), osg::Vec3(0, 1, 0));
 783     }
 784     // Configuring the physical dimensions of a monitor
 785     SGPropertyNode* viewportNode = cameraNode->getNode("viewport", true);
 786     double physicalWidth = viewportNode->getDoubleValue("width", 1024);
 787     double physicalHeight = viewportNode->getDoubleValue("height", 768);
 788     double bezelHeightTop = 0;
 789     double bezelHeightBottom = 0;
 790     double bezelWidthLeft = 0;
 791     double bezelWidthRight = 0;
 792     const SGPropertyNode* physicalDimensionsNode = 0;
 793     if ((physicalDimensionsNode = cameraNode->getNode("physical-dimensions")) != 0) {
 794         physicalWidth = physicalDimensionsNode->getDoubleValue("width", physicalWidth);
 795         physicalHeight = physicalDimensionsNode->getDoubleValue("height", physicalHeight);
 796         const SGPropertyNode* bezelNode = 0;
 797         if ((bezelNode = physicalDimensionsNode->getNode("bezel")) != 0) {
 798             bezelHeightTop = bezelNode->getDoubleValue("top", bezelHeightTop);
 799             bezelHeightBottom = bezelNode->getDoubleValue("bottom", bezelHeightBottom);
 800             bezelWidthLeft = bezelNode->getDoubleValue("left", bezelWidthLeft);
 801             bezelWidthRight = bezelNode->getDoubleValue("right", bezelWidthRight);
 802         }
 803     }
 804     osg::Matrix pOff;
 805     unsigned parentCameraIndex = ~0u;
 806     osg::Vec2d parentReference[2];
 807     osg::Vec2d thisReference[2];
 808     SGPropertyNode* projectionNode = 0;
 809     if ((projectionNode = cameraNode->getNode("perspective")) != 0) {
 810         double fovy = projectionNode->getDoubleValue("fovy-deg", 55.0);
 811         double aspectRatio = projectionNode->getDoubleValue("aspect-ratio",
 812                                                             1.0);
 813         double zNear = projectionNode->getDoubleValue("near", 0.0);
 814         double zFar = projectionNode->getDoubleValue("far", zNear + 20000);
 815         double offsetX = projectionNode->getDoubleValue("offset-x", 0.0);
 816         double offsetY = projectionNode->getDoubleValue("offset-y", 0.0);
 817         double tan_fovy = tan(DegreesToRadians(fovy*0.5));
 818         double right = tan_fovy * aspectRatio * zNear + offsetX;
 819         double left = -tan_fovy * aspectRatio * zNear + offsetX;
 820         double top = tan_fovy * zNear + offsetY;
 821         double bottom = -tan_fovy * zNear + offsetY;
 822         pOff.makeFrustum(left, right, bottom, top, zNear, zFar);
 823         cameraFlags |= PROJECTION_ABSOLUTE;
 824         if (projectionNode->getBoolValue("fixed-near-far", true))
 825             cameraFlags |= FIXED_NEAR_FAR;
 826     } else if ((projectionNode = cameraNode->getNode("frustum")) != 0
 827                || (projectionNode = cameraNode->getNode("ortho")) != 0) {
 828         double top = projectionNode->getDoubleValue("top", 0.0);
 829         double bottom = projectionNode->getDoubleValue("bottom", 0.0);
 830         double left = projectionNode->getDoubleValue("left", 0.0);
 831         double right = projectionNode->getDoubleValue("right", 0.0);
 832         double zNear = projectionNode->getDoubleValue("near", 0.0);
 833         double zFar = projectionNode->getDoubleValue("far", zNear + 20000);
 834         if (cameraNode->getNode("frustum")) {
 835             pOff.makeFrustum(left, right, bottom, top, zNear, zFar);
 836             cameraFlags |= PROJECTION_ABSOLUTE;
 837         } else {
 838             pOff.makeOrtho(left, right, bottom, top, zNear, zFar);
 839             cameraFlags |= (PROJECTION_ABSOLUTE | ORTHO);
 840         }
 841         if (projectionNode->getBoolValue("fixed-near-far", true))
 842             cameraFlags |= FIXED_NEAR_FAR;
 843     } else if ((projectionNode = cameraNode->getNode("master-perspective")) != 0) {
 844         double zNear = projectionNode->getDoubleValue("eye-distance", 0.4*physicalWidth);
 845         double xoff = projectionNode->getDoubleValue("x-offset", 0);
 846         double yoff = projectionNode->getDoubleValue("y-offset", 0);
 847         double left = -0.5*physicalWidth - xoff;
 848         double right = 0.5*physicalWidth - xoff;
 849         double bottom = -0.5*physicalHeight - yoff;
 850         double top = 0.5*physicalHeight - yoff;
 851         pOff.makeFrustum(left, right, bottom, top, zNear, zNear*1000);
 852         cameraFlags |= PROJECTION_ABSOLUTE | ENABLE_MASTER_ZOOM;
 853     } else if ((projectionNode = cameraNode->getNode("right-of-perspective"))
 854                || (projectionNode = cameraNode->getNode("left-of-perspective"))
 855                || (projectionNode = cameraNode->getNode("above-perspective"))
 856                || (projectionNode = cameraNode->getNode("below-perspective"))
 857                || (projectionNode = cameraNode->getNode("reference-points-perspective"))) {
 858         std::string name = projectionNode->getStringValue("parent-camera");
 859         for (unsigned i = 0; i < _cameras.size(); ++i) {
 860             if (_cameras[i]->name != name)
 861                 continue;
 862             parentCameraIndex = i;
 863         }
 864         if (_cameras.size() <= parentCameraIndex) {
 865             SG_LOG(SG_VIEW, SG_ALERT, "CameraGroup::buildCamera: "
 866                    "failed to find parent camera for relative camera!");
 867             return 0;
 868         }
 869         const CameraInfo* parentInfo = _cameras[parentCameraIndex].get();
 870         if (projectionNode->getNameString() == "right-of-perspective") {
 871             double tmp = (parentInfo->physicalWidth + 2*parentInfo->bezelWidthRight)/parentInfo->physicalWidth;
 872             parentReference[0] = osg::Vec2d(tmp, -1);
 873             parentReference[1] = osg::Vec2d(tmp, 1);
 874             tmp = (physicalWidth + 2*bezelWidthLeft)/physicalWidth;
 875             thisReference[0] = osg::Vec2d(-tmp, -1);
 876             thisReference[1] = osg::Vec2d(-tmp, 1);
 877         } else if (projectionNode->getNameString() == "left-of-perspective") {
 878             double tmp = (parentInfo->physicalWidth + 2*parentInfo->bezelWidthLeft)/parentInfo->physicalWidth;
 879             parentReference[0] = osg::Vec2d(-tmp, -1);
 880             parentReference[1] = osg::Vec2d(-tmp, 1);
 881             tmp = (physicalWidth + 2*bezelWidthRight)/physicalWidth;
 882             thisReference[0] = osg::Vec2d(tmp, -1);
 883             thisReference[1] = osg::Vec2d(tmp, 1);
 884         } else if (projectionNode->getNameString() == "above-perspective") {
 885             double tmp = (parentInfo->physicalHeight + 2*parentInfo->bezelHeightTop)/parentInfo->physicalHeight;
 886             parentReference[0] = osg::Vec2d(-1, tmp);
 887             parentReference[1] = osg::Vec2d(1, tmp);
 888             tmp = (physicalHeight + 2*bezelHeightBottom)/physicalHeight;
 889             thisReference[0] = osg::Vec2d(-1, -tmp);
 890             thisReference[1] = osg::Vec2d(1, -tmp);
 891         } else if (projectionNode->getNameString() == "below-perspective") {
 892             double tmp = (parentInfo->physicalHeight + 2*parentInfo->bezelHeightBottom)/parentInfo->physicalHeight;
 893             parentReference[0] = osg::Vec2d(-1, -tmp);
 894             parentReference[1] = osg::Vec2d(1, -tmp);
 895             tmp = (physicalHeight + 2*bezelHeightTop)/physicalHeight;
 896             thisReference[0] = osg::Vec2d(-1, tmp);
 897             thisReference[1] = osg::Vec2d(1, tmp);
 898         } else if (projectionNode->getNameString() == "reference-points-perspective") {
 899             SGPropertyNode* parentNode = projectionNode->getNode("parent", true);
 900             SGPropertyNode* thisNode = projectionNode->getNode("this", true);
 901             SGPropertyNode* pointNode;
 902
 903             pointNode = parentNode->getNode("point", 0, true);
 904             parentReference[0][0] = pointNode->getDoubleValue("x", 0)*2/parentInfo->physicalWidth;
 905             parentReference[0][1] = pointNode->getDoubleValue("y", 0)*2/parentInfo->physicalHeight;
 906             pointNode = parentNode->getNode("point", 1, true);
 907             parentReference[1][0] = pointNode->getDoubleValue("x", 0)*2/parentInfo->physicalWidth;
 908             parentReference[1][1] = pointNode->getDoubleValue("y", 0)*2/parentInfo->physicalHeight;
 909
 910             pointNode = thisNode->getNode("point", 0, true);
 911             thisReference[0][0] = pointNode->getDoubleValue("x", 0)*2/physicalWidth;
 912             thisReference[0][1] = pointNode->getDoubleValue("y", 0)*2/physicalHeight;
 913             pointNode = thisNode->getNode("point", 1, true);
 914             thisReference[1][0] = pointNode->getDoubleValue("x", 0)*2/physicalWidth;
 915             thisReference[1][1] = pointNode->getDoubleValue("y", 0)*2/physicalHeight;
 916         }
 917
 918         pOff = osg::Matrix::perspective(45, physicalWidth/physicalHeight, 1, 20000);
 919         cameraFlags |= PROJECTION_ABSOLUTE | ENABLE_MASTER_ZOOM;
 920     } else {
 921         // old style shear parameters
 922         double shearx = cameraNode->getDoubleValue("shear-x", 0);
 923         double sheary = cameraNode->getDoubleValue("shear-y", 0);
 924         pOff.makeTranslate(-shearx, -sheary, 0);
 925     }
 926     const SGPropertyNode* textureNode = cameraNode->getNode("texture");
 927     if (textureNode) {
 928         string texName = textureNode->getStringValue("name");
 929         int tex_width = textureNode->getIntValue("width");
 930         int tex_height = textureNode->getIntValue("height");
 931         TextureRectangle* texture = new TextureRectangle;
 932
 933         texture->setTextureSize(tex_width, tex_height);
 934         texture->setInternalFormat(GL_RGB);
 935         texture->setFilter(Texture::MIN_FILTER, Texture::LINEAR);
 936         texture->setFilter(Texture::MAG_FILTER, Texture::LINEAR);
 937         texture->setWrap(Texture::WRAP_S, Texture::CLAMP_TO_EDGE);
 938         texture->setWrap(Texture::WRAP_T, Texture::CLAMP_TO_EDGE);
 939         camera->setDrawBuffer(GL_FRONT);
 940         camera->setReadBuffer(GL_FRONT);
 941         camera->setRenderTargetImplementation(Camera::FRAME_BUFFER_OBJECT);
 942         camera->attach(Camera::COLOR_BUFFER, texture);
 943         _textureTargets[texName] = texture;
 944     } else {
 945         camera->setDrawBuffer(GL_BACK);
 946         camera->setReadBuffer(GL_BACK);
 947     }
 948     const SGPropertyNode* psNode = cameraNode->getNode("panoramic-spherical");
 949     bool useMasterSceneGraph = !psNode;
 950     CameraInfo* info = globals->get_renderer()->buildRenderingPipeline(this, cameraFlags, camera, vOff, pOff,
 951                                                                         window->gc.get(), useMasterSceneGraph);
 952     info->name = cameraNode->getStringValue("name");
 953     info->physicalWidth = physicalWidth;
 954     info->physicalHeight = physicalHeight;
 955     info->bezelHeightTop = bezelHeightTop;
 956     info->bezelHeightBottom = bezelHeightBottom;
 957     info->bezelWidthLeft = bezelWidthLeft;
 958     info->bezelWidthRight = bezelWidthRight;
 959     info->relativeCameraParent = parentCameraIndex;
 960     info->parentReference[0] = parentReference[0];
 961     info->parentReference[1] = parentReference[1];
 962     info->thisReference[0] = thisReference[0];
 963     info->thisReference[1] = thisReference[1];
 964     // If a viewport isn't set on the camera, then it's hard to dig it
 965     // out of the SceneView objects in the viewer, and the coordinates
 966     // of mouse events are somewhat bizzare.
 967     buildViewport(info, viewportNode, window->gc->getTraits());
 968     info->updateCameras();
 969     // Distortion camera needs the viewport which is created by addCamera().
 970     if (psNode) {
 971         info->flags = info->flags | VIEW_ABSOLUTE;
 972         buildDistortionCamera(psNode, camera);
 973     }
 974     return info;
 975 }
 976
 977 CameraInfo* CameraGroup::buildGUICamera(SGPropertyNode* cameraNode,
 978                                         GraphicsWindow* window)
 979 {
 980     WindowBuilder *wBuild = WindowBuilder::getWindowBuilder();
 981     const SGPropertyNode* windowNode = (cameraNode
 982                                         ? cameraNode->getNode("window")
 983                                         : 0);
 984     if (!window && windowNode) {
 985       // New style window declaration / definition
 986       window = wBuild->buildWindow(windowNode);
 987     }
 988
 989     if (!window) { // buildWindow can fail
 990       SG_LOG(SG_VIEW, SG_WARN, "CameraGroup::buildGUICamera: failed to build a window");
 991       return NULL;
 992     }
 993
 994     Camera* camera = new Camera;
 995     camera->setName( "GUICamera" );
 996     camera->setAllowEventFocus(false);
 997     camera->setGraphicsContext(window->gc.get());
 998     camera->setViewport(new Viewport);
 999     camera->setClearMask(0);
1000     camera->setInheritanceMask(CullSettings::ALL_VARIABLES
1001                                & ~(CullSettings::COMPUTE_NEAR_FAR_MODE
1002                                    | CullSettings::CULLING_MODE
1003 #if defined(HAVE_CULLSETTINGS_CLEAR_MASK)
1004                                    | CullSettings::CLEAR_MASK
1005 #endif
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     sgUserDataInit( globals->get_props() );
1040
1041     CameraGroup* cgroup = new CameraGroup(viewer);
1042     for (int i = 0; i < gnode->nChildren(); ++i) {
1043         SGPropertyNode* pNode = gnode->getChild(i);
1044         const char* name = pNode->getName();
1045         if (!strcmp(name, "camera")) {
1046             cgroup->buildCamera(pNode);
1047         } else if (!strcmp(name, "window")) {
1048             WindowBuilder::getWindowBuilder()->buildWindow(pNode);
1049         } else if (!strcmp(name, "gui")) {
1050             cgroup->buildGUICamera(pNode);
1051         }
1052     }
1053     bindMemberToNode(gnode, "znear", cgroup, &CameraGroup::_zNear, .1f);
1054     bindMemberToNode(gnode, "zfar", cgroup, &CameraGroup::_zFar, 120000.0f);
1055     bindMemberToNode(gnode, "near-field", cgroup, &CameraGroup::_nearField,
1056                      100.0f);
1057     return cgroup;
1058 }
1059
1060 void CameraGroup::setCameraCullMasks(Node::NodeMask nm)
1061 {
1062     for (CameraIterator i = camerasBegin(), e = camerasEnd(); i != e; ++i) {
1063         CameraInfo* info = i->get();
1064         if (info->flags & GUI)
1065             continue;
1066         osg::ref_ptr<osg::Camera> farCamera = info->getCamera(FAR_CAMERA);
1067         osg::Camera* camera = info->getCamera( MAIN_CAMERA );
1068         if (camera) {
1069             if (farCamera.valid() && farCamera->getNodeMask() != 0) {
1070                 camera->setCullMask(nm & ~simgear::BACKGROUND_BIT);
1071                 camera->setCullMaskLeft(nm & ~simgear::BACKGROUND_BIT);
1072                 camera->setCullMaskRight(nm & ~simgear::BACKGROUND_BIT);
1073                 farCamera->setCullMask(nm);
1074                 farCamera->setCullMaskLeft(nm);
1075                 farCamera->setCullMaskRight(nm);
1076             } else {
1077                 camera->setCullMask(nm);
1078                 camera->setCullMaskLeft(nm);
1079                 camera->setCullMaskRight(nm);
1080             }
1081         } else {
1082             camera = info->getCamera( GEOMETRY_CAMERA );
1083             if (camera == 0) continue;
1084             camera->setCullMask( nm & ~simgear::MODELLIGHT_BIT );
1085         }
1086     }
1087 }
1088
1089 void CameraGroup::resized()
1090 {
1091     for (CameraIterator i = camerasBegin(), e = camerasEnd(); i != e; ++i) {
1092         CameraInfo *info = i->get();
1093         Camera* camera = info->getCamera( MAIN_CAMERA );
1094         if ( camera == 0 )
1095             camera = info->getCamera( DISPLAY_CAMERA );
1096         const Viewport* viewport = camera->getViewport();
1097         info->x = viewport->x();
1098         info->y = viewport->y();
1099         info->width = viewport->width();
1100         info->height = viewport->height();
1101
1102         info->resized( info->width, info->height );
1103     }
1104 }
1105
1106 const CameraInfo* CameraGroup::getGUICamera() const
1107 {
1108     ConstCameraIterator result
1109         = std::find_if(camerasBegin(), camerasEnd(),
1110                    FlagTester<CameraInfo>(GUI));
1111     if (result == camerasEnd()) {
1112         return NULL;
1113     }
1114
1115     return *result;
1116 }
1117
1118 Camera* getGUICamera(CameraGroup* cgroup)
1119 {
1120     const CameraInfo* info = cgroup->getGUICamera();
1121     if (!info) {
1122         return NULL;
1123     }
1124
1125     return info->getCamera(MAIN_CAMERA);
1126 }
1127
1128 static bool computeCameraIntersection(const CameraInfo* cinfo,
1129                                       const osgGA::GUIEventAdapter* ea,
1130                                       osgUtil::LineSegmentIntersector::Intersections& intersections)
1131 {
1132   using osgUtil::Intersector;
1133   using osgUtil::LineSegmentIntersector;
1134   double x, y;
1135   eventToWindowCoords(ea, x, y);
1136
1137   if (!(cinfo->flags & CameraGroup::DO_INTERSECTION_TEST))
1138     return false;
1139
1140   const Camera* camera = cinfo->getCamera(MAIN_CAMERA);
1141   if ( !camera )
1142     camera = cinfo->getCamera( GEOMETRY_CAMERA );
1143   if (camera->getGraphicsContext() != ea->getGraphicsContext())
1144     return false;
1145
1146   const Viewport* viewport = camera->getViewport();
1147   double epsilon = 0.5;
1148   if (!(x >= viewport->x() - epsilon
1149         && x < viewport->x() + viewport->width() -1.0 + epsilon
1150         && y >= viewport->y() - epsilon
1151         && y < viewport->y() + viewport->height() -1.0 + epsilon))
1152     return false;
1153
1154   Vec4d start(x, y, 0.0, 1.0);
1155   Vec4d end(x, y, 1.0, 1.0);
1156   Matrix windowMat = viewport->computeWindowMatrix();
1157   Matrix startPtMat = Matrix::inverse(camera->getProjectionMatrix()
1158                                       * windowMat);
1159   Matrix endPtMat;
1160   const Camera* farCamera = cinfo->getCamera( FAR_CAMERA );
1161   if (!farCamera || farCamera->getNodeMask() == 0)
1162     endPtMat = startPtMat;
1163   else
1164     endPtMat = Matrix::inverse(farCamera->getProjectionMatrix()
1165                                * windowMat);
1166   start = start * startPtMat;
1167   start /= start.w();
1168   end = end * endPtMat;
1169   end /= end.w();
1170   ref_ptr<LineSegmentIntersector> picker
1171   = new LineSegmentIntersector(Intersector::VIEW,
1172                                Vec3d(start.x(), start.y(), start.z()),
1173                                Vec3d(end.x(), end.y(), end.z()));
1174   osgUtil::IntersectionVisitor iv(picker.get());
1175   iv.setTraversalMask( ~simgear::MODELLIGHT_BIT );
1176   const_cast<Camera*>(camera)->accept(iv);
1177   if (picker->containsIntersections()) {
1178     intersections = picker->getIntersections();
1179     return true;
1180   }
1181
1182   return false;
1183 }
1184
1185 bool computeIntersections(const CameraGroup* cgroup,
1186                           const osgGA::GUIEventAdapter* ea,
1187                           osgUtil::LineSegmentIntersector::Intersections& intersections)
1188 {
1189     // test the GUI first
1190     const CameraInfo* guiCamera = cgroup->getGUICamera();
1191     if (guiCamera && computeCameraIntersection(guiCamera, ea, intersections))
1192         return true;
1193
1194     // Find camera that contains event
1195     for (CameraGroup::ConstCameraIterator iter = cgroup->camerasBegin(),
1196              e = cgroup->camerasEnd();
1197          iter != e;
1198          ++iter) {
1199         const CameraInfo* cinfo = iter->get();
1200         if (cinfo == guiCamera)
1201             continue;
1202
1203         if (computeCameraIntersection(cinfo, ea, intersections))
1204             return true;
1205     }
1206
1207     intersections.clear();
1208     return false;
1209 }
1210
1211 void warpGUIPointer(CameraGroup* cgroup, int x, int y)
1212 {
1213     using osgViewer::GraphicsWindow;
1214     Camera* guiCamera = getGUICamera(cgroup);
1215     if (!guiCamera)
1216         return;
1217     Viewport* vport = guiCamera->getViewport();
1218     GraphicsWindow* gw
1219         = dynamic_cast<GraphicsWindow*>(guiCamera->getGraphicsContext());
1220     if (!gw)
1221         return;
1222     globals->get_renderer()->getEventHandler()->setMouseWarped();
1223     // Translate the warp request into the viewport of the GUI camera,
1224     // send the request to the window, then transform the coordinates
1225     // for the Viewer's event queue.
1226     double wx = x + vport->x();
1227     double wyUp = vport->height() + vport->y() - y;
1228     double wy;
1229     const GraphicsContext::Traits* traits = gw->getTraits();
1230     if (gw->getEventQueue()->getCurrentEventState()->getMouseYOrientation()
1231         == osgGA::GUIEventAdapter::Y_INCREASING_DOWNWARDS) {
1232         wy = traits->height - wyUp;
1233     } else {
1234         wy = wyUp;
1235     }
1236     gw->getEventQueue()->mouseWarped(wx, wy);
1237     gw->requestWarpPointer(wx, wy);
1238     osgGA::GUIEventAdapter* eventState
1239         = cgroup->getViewer()->getEventQueue()->getCurrentEventState();
1240     double viewerX
1241         = (eventState->getXmin()
1242            + ((wx / double(traits->width))
1243               * (eventState->getXmax() - eventState->getXmin())));
1244     double viewerY
1245         = (eventState->getYmin()
1246            + ((wyUp / double(traits->height))
1247               * (eventState->getYmax() - eventState->getYmin())));
1248     cgroup->getViewer()->getEventQueue()->mouseWarped(viewerX, viewerY);
1249 }
1250 }