src/Main/CameraGroup.cxx

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