src/Main/CameraGroup.cxx

   1 // Copyright (C) 2008  Tim Moore
   2 //
   3 // This program is free software; you can redistribute it and/or
   4 // modify it under the terms of the GNU General Public License as
   5 // published by the Free Software Foundation; either version 2 of the
   6 // License, or (at your option) any later version.
   7 //
   8 // This program is distributed in the hope that it will be useful, but
   9 // WITHOUT ANY WARRANTY; without even the implied warranty of
  10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11 // General Public License for more details.
  12 //
  13 // You should have received a copy of the GNU General Public License
  14 // along with this program; if not, write to the Free Software
  15 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  16
  17 #ifdef HAVE_CONFIG_H
  18 #  include <config.h>
  19 #endif
  20
  21 #include "CameraGroup.hxx"
  22
  23 #include "globals.hxx"
  24 #include "renderer.hxx"
  25 #include "FGEventHandler.hxx"
  26 #include "WindowBuilder.hxx"
  27 #include "WindowSystemAdapter.hxx"
  28 #include <simgear/props/props.hxx>
  29 #include <simgear/structure/OSGUtils.hxx>
  30 #include <simgear/scene/material/EffectCullVisitor.hxx>
  31 #include <simgear/scene/util/RenderConstants.hxx>
  32
  33 #include <algorithm>
  34 #include <cstring>
  35 #include <string>
  36
  37 #include <osg/Camera>
  38 #include <osg/Geometry>
  39 #include <osg/GraphicsContext>
  40 #include <osg/io_utils>
  41 #include <osg/Math>
  42 #include <osg/Matrix>
  43 #include <osg/Notify>
  44 #include <osg/Program>
  45 #include <osg/Quat>
  46 #include <osg/TexMat>
  47 #include <osg/Vec3d>
  48 #include <osg/Viewport>
  49
  50 #include <osgUtil/IntersectionVisitor>
  51
  52 #include <osgViewer/GraphicsWindow>
  53 #include <osgViewer/Renderer>
  54
  55 namespace flightgear
  56 {
  57 using namespace osg;
  58
  59 using std::strcmp;
  60 using std::string;
  61
  62 ref_ptr<CameraGroup> CameraGroup::_defaultGroup;
  63
  64 CameraGroup::CameraGroup(osgViewer::Viewer* viewer) :
  65     _viewer(viewer)
  66 {
  67 }
  68
  69 }
  70
  71 namespace
  72 {
  73 using namespace osg;
  74
  75 // Given a projection matrix, return a new one with the same frustum
  76 // sides and new near / far values.
  77
  78 void makeNewProjMat(Matrixd& oldProj, double znear,
  79                                        double zfar, Matrixd& projection)
  80 {
  81     projection = oldProj;
  82     // Slightly inflate the near & far planes to avoid objects at the
  83     // extremes being clipped out.
  84     znear *= 0.999;
  85     zfar *= 1.001;
  86
  87     // Clamp the projection matrix z values to the range (near, far)
  88     double epsilon = 1.0e-6;
  89     if (fabs(projection(0,3)) < epsilon &&
  90         fabs(projection(1,3)) < epsilon &&
  91         fabs(projection(2,3)) < epsilon) {
  92         // Projection is Orthographic
  93         epsilon = -1.0/(zfar - znear); // Used as a temp variable
  94         projection(2,2) = 2.0*epsilon;
  95         projection(3,2) = (zfar + znear)*epsilon;
  96     } else {
  97         // Projection is Perspective
  98         double trans_near = (-znear*projection(2,2) + projection(3,2)) /
  99             (-znear*projection(2,3) + projection(3,3));
 100         double trans_far = (-zfar*projection(2,2) + projection(3,2)) /
 101             (-zfar*projection(2,3) + projection(3,3));
 102         double ratio = fabs(2.0/(trans_near - trans_far));
 103         double center = -0.5*(trans_near + trans_far);
 104
 105         projection.postMult(osg::Matrixd(1.0, 0.0, 0.0, 0.0,
 106                                          0.0, 1.0, 0.0, 0.0,
 107                                          0.0, 0.0, ratio, 0.0,
 108                                          0.0, 0.0, center*ratio, 1.0));
 109     }
 110 }
 111
 112 void installCullVisitor(Camera* camera)
 113 {
 114     osgViewer::Renderer* renderer
 115         = static_cast<osgViewer::Renderer*>(camera->getRenderer());
 116     for (int i = 0; i < 2; ++i) {
 117         osgUtil::SceneView* sceneView = renderer->getSceneView(i);
 118         sceneView->setCullVisitor(new simgear::EffectCullVisitor);
 119     }
 120 }
 121 }
 122
 123 namespace flightgear
 124 {
 125 void updateCameras(const CameraInfo* info)
 126 {
 127     if (info->camera.valid())
 128         info->camera->getViewport()->setViewport(info->x, info->y,
 129                                                  info->width, info->height);
 130     if (info->farCamera.valid())
 131         info->farCamera->getViewport()->setViewport(info->x, info->y,
 132                                                     info->width, info->height);
 133 }
 134
 135 CameraInfo* CameraGroup::addCamera(unsigned flags, Camera* camera,
 136                                    const Matrix& view,
 137                                    const Matrix& projection,
 138                                    bool useMasterSceneData)
 139 {
 140     CameraInfo* info = new CameraInfo(flags);
 141     // The camera group will always update the camera
 142     camera->setReferenceFrame(Transform::ABSOLUTE_RF);
 143
 144     Camera* farCamera = 0;
 145     if ((flags & (GUI | ORTHO)) == 0) {
 146         farCamera = new Camera;
 147         farCamera->setAllowEventFocus(camera->getAllowEventFocus());
 148         farCamera->setGraphicsContext(camera->getGraphicsContext());
 149         farCamera->setCullingMode(camera->getCullingMode());
 150         farCamera->setInheritanceMask(camera->getInheritanceMask());
 151         farCamera->setReferenceFrame(Transform::ABSOLUTE_RF);
 152         // Each camera's viewport is written when the window is
 153         // resized; if the the viewport isn't copied here, it gets updated
 154         // twice and ends up with the wrong value.
 155         farCamera->setViewport(simgear::clone(camera->getViewport()));
 156         farCamera->setDrawBuffer(camera->getDrawBuffer());
 157         farCamera->setReadBuffer(camera->getReadBuffer());
 158         farCamera->setRenderTargetImplementation(
 159             camera->getRenderTargetImplementation());
 160         const Camera::BufferAttachmentMap& bufferMap
 161             = camera->getBufferAttachmentMap();
 162         if (bufferMap.count(Camera::COLOR_BUFFER) != 0) {
 163             farCamera->attach(
 164                 Camera::COLOR_BUFFER,
 165                 bufferMap.find(Camera::COLOR_BUFFER)->second._texture);
 166         }
 167         _viewer->addSlave(farCamera, projection, view, useMasterSceneData);
 168         installCullVisitor(farCamera);
 169         info->farCamera = farCamera;
 170         info->farSlaveIndex = _viewer->getNumSlaves() - 1;
 171         farCamera->setRenderOrder(Camera::POST_RENDER, info->farSlaveIndex);
 172         camera->setCullMask(camera->getCullMask() & ~simgear::BACKGROUND_BIT);
 173         camera->setClearMask(GL_DEPTH_BUFFER_BIT);
 174     }
 175     _viewer->addSlave(camera, projection, view, useMasterSceneData);
 176     installCullVisitor(camera);
 177     info->camera = camera;
 178     info->slaveIndex = _viewer->getNumSlaves() - 1;
 179     camera->setRenderOrder(Camera::POST_RENDER, info->slaveIndex);
 180     _cameras.push_back(info);
 181     return info;
 182 }
 183
 184 void CameraGroup::update(const osg::Vec3d& position,
 185                          const osg::Quat& orientation)
 186 {
 187     const Matrix masterView(osg::Matrix::translate(-position)
 188                             * osg::Matrix::rotate(orientation.inverse()));
 189     _viewer->getCamera()->setViewMatrix(masterView);
 190     const Matrix& masterProj = _viewer->getCamera()->getProjectionMatrix();
 191     for (CameraList::iterator i = _cameras.begin(); i != _cameras.end(); ++i) {
 192         const CameraInfo* info = i->get();
 193         const View::Slave& slave = _viewer->getSlave(info->slaveIndex);
 194         // refreshes camera viewports (for now)
 195         updateCameras(info);
 196         Camera* camera = info->camera.get();
 197         Matrix viewMatrix;
 198         if ((info->flags & VIEW_ABSOLUTE) != 0)
 199             viewMatrix = slave._viewOffset;
 200         else
 201             viewMatrix = masterView * slave._viewOffset;
 202         camera->setViewMatrix(viewMatrix);
 203         Matrix projectionMatrix;
 204         if ((info->flags & PROJECTION_ABSOLUTE) != 0)
 205             projectionMatrix = slave._projectionOffset;
 206         else
 207             projectionMatrix = masterProj * slave._projectionOffset;
 208
 209         if (!info->farCamera.valid()) {
 210             camera->setProjectionMatrix(projectionMatrix);
 211         } else {
 212             Camera* farCamera = info->farCamera.get();
 213             farCamera->setViewMatrix(viewMatrix);
 214             double left, right, bottom, top, parentNear, parentFar;
 215             projectionMatrix.getFrustum(left, right, bottom, top,
 216                                         parentNear, parentFar);
 217             if (parentFar < _nearField || _nearField == 0.0f) {
 218                 camera->setProjectionMatrix(projectionMatrix);
 219                 camera->setCullMask(camera->getCullMask()
 220                                     | simgear::BACKGROUND_BIT);
 221                 camera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
 222                 farCamera->setNodeMask(0);
 223             } else {
 224                 Matrix nearProj, farProj;
 225                 makeNewProjMat(projectionMatrix, parentNear, _nearField,
 226                                nearProj);
 227                 makeNewProjMat(projectionMatrix, _nearField, parentFar,
 228                                farProj);
 229                 camera->setProjectionMatrix(nearProj);
 230                 camera->setCullMask(camera->getCullMask()
 231                                     & ~simgear::BACKGROUND_BIT);
 232                 camera->setClearMask(GL_DEPTH_BUFFER_BIT);
 233                 farCamera->setProjectionMatrix(farProj);
 234                 farCamera->setNodeMask(camera->getNodeMask());
 235             }
 236         }
 237     }
 238 }
 239
 240 void CameraGroup::setCameraParameters(float vfov, float aspectRatio)
 241 {
 242     if (vfov != 0.0f && aspectRatio != 0.0f)
 243         _viewer->getCamera()
 244             ->setProjectionMatrixAsPerspective(vfov,
 245                                                1.0f / aspectRatio,
 246                                                _zNear, _zFar);
 247 }
 248 }
 249
 250 namespace
 251 {
 252 // A raw value for property nodes that references a class member via
 253 // an osg::ref_ptr.
 254 template<class C, class T>
 255 class RefMember : public SGRawValue<T>
 256 {
 257 public:
 258     RefMember (C *obj, T C::*ptr)
 259         : _obj(obj), _ptr(ptr) {}
 260     virtual ~RefMember () {}
 261     virtual T getValue () const
 262     {
 263         return _obj.get()->*_ptr;
 264     }
 265     virtual bool setValue (T value)
 266     {
 267         _obj.get()->*_ptr = value;
 268         return true;
 269     }
 270     virtual SGRawValue<T> * clone () const
 271     {
 272         return new RefMember(_obj.get(), _ptr);
 273     }
 274 private:
 275     ref_ptr<C> _obj;
 276     T C::* const _ptr;
 277 };
 278
 279 template<typename C, typename T>
 280 RefMember<C, T> makeRefMember(C *obj, T C::*ptr)
 281 {
 282     return RefMember<C, T>(obj, ptr);
 283 }
 284
 285 template<typename C, typename T>
 286 void bindMemberToNode(SGPropertyNode* parent, const char* childName,
 287                       C* obj, T C::*ptr, T value)
 288 {
 289     SGPropertyNode* valNode = parent->getNode(childName);
 290     RefMember<C, T> refMember = makeRefMember(obj, ptr);
 291     if (!valNode) {
 292         valNode = parent->getNode(childName, true);
 293         valNode->tie(refMember, false);
 294         setValue(valNode, value);
 295     } else {
 296         valNode->tie(refMember, true);
 297     }
 298 }
 299
 300 void buildViewport(flightgear::CameraInfo* info, SGPropertyNode* viewportNode,
 301                    const osg::GraphicsContext::Traits *traits)
 302 {
 303     using namespace flightgear;
 304     bindMemberToNode(viewportNode, "x", info, &CameraInfo::x, 0.0);
 305     bindMemberToNode(viewportNode, "y", info, &CameraInfo::y, 0.0);
 306     bindMemberToNode(viewportNode, "width", info, &CameraInfo::width,
 307                      static_cast<double>(traits->width));
 308     bindMemberToNode(viewportNode, "height", info, &CameraInfo::height,
 309                      static_cast<double>(traits->height));
 310 }
 311 }
 312
 313 namespace flightgear
 314 {
 315
 316 // Mostly copied from osg's osgViewer/View.cpp
 317
 318 static osg::Geometry* createParoramicSphericalDisplayDistortionMesh(
 319     const Vec3& origin, const Vec3& widthVector, const Vec3& heightVector,
 320     double sphere_radius, double collar_radius,
 321     Image* intensityMap = 0, const Matrix& projectorMatrix = Matrix())
 322 {
 323     osg::Vec3d center(0.0,0.0,0.0);
 324     osg::Vec3d eye(0.0,0.0,0.0);
 325
 326     double distance = sqrt(sphere_radius*sphere_radius - collar_radius*collar_radius);
 327     bool flip = false;
 328     bool texcoord_flip = false;
 329
 330     osg::Vec3d projector = eye - osg::Vec3d(0.0,0.0, distance);
 331
 332 #if 0
 333     OSG_INFO<<"createParoramicSphericalDisplayDistortionMesh : Projector position = "<<projector<<std::endl;
 334     OSG_INFO<<"createParoramicSphericalDisplayDistortionMesh : distance = "<<distance<<std::endl;
 335 #endif
 336     // create the quad to visualize.
 337     osg::Geometry* geometry = new osg::Geometry();
 338
 339     geometry->setSupportsDisplayList(false);
 340
 341     osg::Vec3 xAxis(widthVector);
 342     float width = widthVector.length();
 343     xAxis /= width;
 344
 345     osg::Vec3 yAxis(heightVector);
 346     float height = heightVector.length();
 347     yAxis /= height;
 348
 349     int noSteps = 160;
 350
 351     osg::Vec3Array* vertices = new osg::Vec3Array;
 352     osg::Vec2Array* texcoords0 = new osg::Vec2Array;
 353     osg::Vec2Array* texcoords1 = intensityMap==0 ? new osg::Vec2Array : 0;
 354     osg::Vec4Array* colors = new osg::Vec4Array;
 355
 356     osg::Vec3 bottom = origin;
 357     osg::Vec3 dx = xAxis*(width/((float)(noSteps-2)));
 358     osg::Vec3 dy = yAxis*(height/((float)(noSteps-1)));
 359
 360     osg::Vec3 top = origin + yAxis*height;
 361
 362     osg::Vec3 screenCenter = origin + widthVector*0.5f + heightVector*0.5f;
 363     float screenRadius = heightVector.length() * 0.5f;
 364
 365     geometry->getOrCreateStateSet()->setMode(GL_CULL_FACE, osg::StateAttribute::OFF | osg::StateAttribute::PROTECTED);
 366
 367     for(int i=0;i<noSteps;++i)
 368     {
 369         osg::Vec3 cursor = bottom+dy*(float)i;
 370         for(int j=0;j<noSteps;++j)
 371         {
 372             osg::Vec2 texcoord(double(i)/double(noSteps-1), double(j)/double(noSteps-1));
 373             double theta = texcoord.x() * 2.0 * osg::PI;
 374             double phi = (1.0-texcoord.y()) * osg::PI;
 375
 376             if (texcoord_flip) texcoord.y() = 1.0f - texcoord.y();
 377
 378             osg::Vec3 pos(sin(phi)*sin(theta), sin(phi)*cos(theta), cos(phi));
 379             pos = pos*projectorMatrix;
 380
 381             double alpha = atan2(pos.x(), pos.y());
 382             if (alpha<0.0) alpha += 2.0*osg::PI;
 383
 384             double beta = atan2(sqrt(pos.x()*pos.x() + pos.y()*pos.y()), pos.z());
 385             if (beta<0.0) beta += 2.0*osg::PI;
 386
 387             double gamma = atan2(sqrt(double(pos.x()*pos.x() + pos.y()*pos.y())), double(pos.z()+distance));
 388             if (gamma<0.0) gamma += 2.0*osg::PI;
 389
 390
 391             osg::Vec3 v = screenCenter + osg::Vec3(sin(alpha)*gamma*2.0/osg::PI, -cos(alpha)*gamma*2.0/osg::PI, 0.0f)*screenRadius;
 392
 393             if (flip)
 394                 vertices->push_back(osg::Vec3(v.x(), top.y()-(v.y()-origin.y()),v.z()));
 395             else
 396                 vertices->push_back(v);
 397
 398             texcoords0->push_back( texcoord );
 399
 400             osg::Vec2 texcoord1(alpha/(2.0*osg::PI), 1.0f - beta/osg::PI);
 401             if (intensityMap)
 402             {
 403                 colors->push_back(intensityMap->getColor(texcoord1));
 404             }
 405             else
 406             {
 407                 colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
 408                 if (texcoords1) texcoords1->push_back( texcoord1 );
 409             }
 410
 411
 412         }
 413     }
 414
 415
 416     // pass the created vertex array to the points geometry object.
 417     geometry->setVertexArray(vertices);
 418
 419     geometry->setColorArray(colors);
 420     geometry->setColorBinding(osg::Geometry::BIND_PER_VERTEX);
 421
 422     geometry->setTexCoordArray(0,texcoords0);
 423     if (texcoords1) geometry->setTexCoordArray(1,texcoords1);
 424
 425     osg::DrawElementsUShort* elements = new osg::DrawElementsUShort(osg::PrimitiveSet::TRIANGLES);
 426     geometry->addPrimitiveSet(elements);
 427
 428     for(int i=0;i<noSteps-1;++i)
 429     {
 430         for(int j=0;j<noSteps-1;++j)
 431         {
 432             int i1 = j+(i+1)*noSteps;
 433             int i2 = j+(i)*noSteps;
 434             int i3 = j+1+(i)*noSteps;
 435             int i4 = j+1+(i+1)*noSteps;
 436
 437             osg::Vec3& v1 = (*vertices)[i1];
 438             osg::Vec3& v2 = (*vertices)[i2];
 439             osg::Vec3& v3 = (*vertices)[i3];
 440             osg::Vec3& v4 = (*vertices)[i4];
 441
 442             if ((v1-screenCenter).length()>screenRadius) continue;
 443             if ((v2-screenCenter).length()>screenRadius) continue;
 444             if ((v3-screenCenter).length()>screenRadius) continue;
 445             if ((v4-screenCenter).length()>screenRadius) continue;
 446
 447             elements->push_back(i1);
 448             elements->push_back(i2);
 449             elements->push_back(i3);
 450
 451             elements->push_back(i1);
 452             elements->push_back(i3);
 453             elements->push_back(i4);
 454         }
 455     }
 456
 457     return geometry;
 458 }
 459
 460 void CameraGroup::buildDistortionCamera(const SGPropertyNode* psNode,
 461                                         Camera* camera)
 462 {
 463     const SGPropertyNode* texNode = psNode->getNode("texture");
 464     if (!texNode) {
 465         // error
 466         return;
 467     }
 468     string texName = texNode->getStringValue();
 469     TextureMap::iterator itr = _textureTargets.find(texName);
 470     if (itr == _textureTargets.end()) {
 471         // error
 472         return;
 473     }
 474     Viewport* viewport = camera->getViewport();
 475     float width = viewport->width();
 476     float height = viewport->height();
 477     TextureRectangle* texRect = itr->second.get();
 478     double radius = psNode->getDoubleValue("radius", 1.0);
 479     double collar = psNode->getDoubleValue("collar", 0.45);
 480     Geode* geode = new Geode();
 481     geode->addDrawable(createParoramicSphericalDisplayDistortionMesh(
 482                            Vec3(0.0f,0.0f,0.0f), Vec3(width,0.0f,0.0f),
 483                            Vec3(0.0f,height,0.0f), radius, collar));
 484
 485     // new we need to add the texture to the mesh, we do so by creating a
 486     // StateSet to contain the Texture StateAttribute.
 487     StateSet* stateset = geode->getOrCreateStateSet();
 488     stateset->setTextureAttributeAndModes(0, texRect, StateAttribute::ON);
 489     stateset->setMode(GL_LIGHTING, StateAttribute::OFF);
 490
 491     TexMat* texmat = new TexMat;
 492     texmat->setScaleByTextureRectangleSize(true);
 493     stateset->setTextureAttributeAndModes(0, texmat, osg::StateAttribute::ON);
 494 #if 0
 495     if (!applyIntensityMapAsColours && intensityMap)
 496     {
 497         stateset->setTextureAttributeAndModes(1, new osg::Texture2D(intensityMap), osg::StateAttribute::ON);
 498     }
 499 #endif
 500     // add subgraph to render
 501     camera->addChild(geode);
 502     camera->setClearMask(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
 503     camera->setClearColor(osg::Vec4(0.0, 0.0, 0.0, 1.0));
 504     camera->setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR);
 505     camera->setCullingMode(osg::CullSettings::NO_CULLING);
 506     camera->setName("DistortionCorrectionCamera");
 507 }
 508
 509 CameraInfo* CameraGroup::buildCamera(SGPropertyNode* cameraNode)
 510 {
 511     WindowBuilder *wBuild = WindowBuilder::getWindowBuilder();
 512     const SGPropertyNode* windowNode = cameraNode->getNode("window");
 513     GraphicsWindow* window = 0;
 514     int cameraFlags = DO_INTERSECTION_TEST;
 515     if (windowNode) {
 516         // New style window declaration / definition
 517         window = wBuild->buildWindow(windowNode);
 518     } else {
 519         // Old style: suck window params out of camera block
 520         window = wBuild->buildWindow(cameraNode);
 521     }
 522     if (!window) {
 523         return 0;
 524     }
 525     Camera* camera = new Camera;
 526     camera->setAllowEventFocus(false);
 527     camera->setGraphicsContext(window->gc.get());
 528     camera->setViewport(new Viewport);
 529     camera->setCullingMode(CullSettings::SMALL_FEATURE_CULLING
 530                            | CullSettings::VIEW_FRUSTUM_CULLING);
 531     camera->setInheritanceMask(CullSettings::ALL_VARIABLES
 532                                & ~(CullSettings::CULL_MASK
 533                                    | CullSettings::CULLING_MODE
 534 #if defined(HAVE_CULLSETTINGS_CLEAR_MASK)
 535                                    | CullSettings::CLEAR_MASK
 536 #endif
 537                                    ));
 538
 539     osg::Matrix pOff;
 540     osg::Matrix vOff;
 541     const SGPropertyNode* viewNode = cameraNode->getNode("view");
 542     if (viewNode) {
 543         double heading = viewNode->getDoubleValue("heading-deg", 0.0);
 544         double pitch = viewNode->getDoubleValue("pitch-deg", 0.0);
 545         double roll = viewNode->getDoubleValue("roll-deg", 0.0);
 546         double x = viewNode->getDoubleValue("x", 0.0);
 547         double y = viewNode->getDoubleValue("y", 0.0);
 548         double z = viewNode->getDoubleValue("z", 0.0);
 549         // Build a view matrix, which is the inverse of a model
 550         // orientation matrix.
 551         vOff = (Matrix::translate(-x, -y, -z)
 552                 * Matrix::rotate(-DegreesToRadians(heading),
 553                                  Vec3d(0.0, 1.0, 0.0),
 554                                  -DegreesToRadians(pitch),
 555                                  Vec3d(1.0, 0.0, 0.0),
 556                                  -DegreesToRadians(roll),
 557                                  Vec3d(0.0, 0.0, 1.0)));
 558         if (viewNode->getBoolValue("absolute", false))
 559             cameraFlags |= VIEW_ABSOLUTE;
 560     } else {
 561         // Old heading parameter, works in the opposite direction
 562         double heading = cameraNode->getDoubleValue("heading-deg", 0.0);
 563         vOff.makeRotate(DegreesToRadians(heading), osg::Vec3(0, 1, 0));
 564     }
 565     const SGPropertyNode* projectionNode = 0;
 566     if ((projectionNode = cameraNode->getNode("perspective")) != 0) {
 567         double fovy = projectionNode->getDoubleValue("fovy-deg", 55.0);
 568         double aspectRatio = projectionNode->getDoubleValue("aspect-ratio",
 569                                                             1.0);
 570         double zNear = projectionNode->getDoubleValue("near", 0.0);
 571         double zFar = projectionNode->getDoubleValue("far", 0.0);
 572         double offsetX = projectionNode->getDoubleValue("offset-x", 0.0);
 573         double offsetY = projectionNode->getDoubleValue("offset-y", 0.0);
 574         double tan_fovy = tan(DegreesToRadians(fovy*0.5));
 575         double right = tan_fovy * aspectRatio * zNear + offsetX;
 576         double left = -tan_fovy * aspectRatio * zNear + offsetX;
 577         double top = tan_fovy * zNear + offsetY;
 578         double bottom = -tan_fovy * zNear + offsetY;
 579         pOff.makeFrustum(left, right, bottom, top, zNear, zFar);
 580         cameraFlags |= PROJECTION_ABSOLUTE;
 581     } else if ((projectionNode = cameraNode->getNode("frustum")) != 0
 582                || (projectionNode = cameraNode->getNode("ortho")) != 0) {
 583         double top = projectionNode->getDoubleValue("top", 0.0);
 584         double bottom = projectionNode->getDoubleValue("bottom", 0.0);
 585         double left = projectionNode->getDoubleValue("left", 0.0);
 586         double right = projectionNode->getDoubleValue("right", 0.0);
 587         double zNear = projectionNode->getDoubleValue("near", 0.0);
 588         double zFar = projectionNode->getDoubleValue("far", 0.0);
 589         if (cameraNode->getNode("frustum")) {
 590             pOff.makeFrustum(left, right, bottom, top, zNear, zFar);
 591             cameraFlags |= PROJECTION_ABSOLUTE;
 592         } else {
 593             pOff.makeOrtho(left, right, bottom, top, zNear, zFar);
 594             cameraFlags |= (PROJECTION_ABSOLUTE | ORTHO);
 595         }
 596     } else {
 597         // old style shear parameters
 598         double shearx = cameraNode->getDoubleValue("shear-x", 0);
 599         double sheary = cameraNode->getDoubleValue("shear-y", 0);
 600         pOff.makeTranslate(-shearx, -sheary, 0);
 601     }
 602     const SGPropertyNode* textureNode = cameraNode->getNode("texture");
 603     if (textureNode) {
 604         string texName = textureNode->getStringValue("name");
 605         int tex_width = textureNode->getIntValue("width");
 606         int tex_height = textureNode->getIntValue("height");
 607         TextureRectangle* texture = new TextureRectangle;
 608
 609         texture->setTextureSize(tex_width, tex_height);
 610         texture->setInternalFormat(GL_RGB);
 611         texture->setFilter(Texture::MIN_FILTER, Texture::LINEAR);
 612         texture->setFilter(Texture::MAG_FILTER, Texture::LINEAR);
 613         texture->setWrap(Texture::WRAP_S, Texture::CLAMP_TO_EDGE);
 614         texture->setWrap(Texture::WRAP_T, Texture::CLAMP_TO_EDGE);
 615         camera->setDrawBuffer(GL_FRONT);
 616         camera->setReadBuffer(GL_FRONT);
 617         camera->setRenderTargetImplementation(Camera::FRAME_BUFFER_OBJECT);
 618         camera->attach(Camera::COLOR_BUFFER, texture);
 619         _textureTargets[texName] = texture;
 620     } else {
 621         camera->setDrawBuffer(GL_BACK);
 622         camera->setReadBuffer(GL_BACK);
 623     }
 624     const SGPropertyNode* psNode = cameraNode->getNode("panoramic-spherical");
 625     bool useMasterSceneGraph = !psNode;
 626     CameraInfo* info = addCamera(cameraFlags, camera, vOff, pOff,
 627                                  useMasterSceneGraph);
 628     // If a viewport isn't set on the camera, then it's hard to dig it
 629     // out of the SceneView objects in the viewer, and the coordinates
 630     // of mouse events are somewhat bizzare.
 631     SGPropertyNode* viewportNode = cameraNode->getNode("viewport", true);
 632     buildViewport(info, viewportNode, window->gc->getTraits());
 633     updateCameras(info);
 634     // Distortion camera needs the viewport which is created by addCamera().
 635     if (psNode) {
 636         info->flags = info->flags | VIEW_ABSOLUTE;
 637         buildDistortionCamera(psNode, camera);
 638     }
 639     return info;
 640 }
 641
 642 CameraInfo* CameraGroup::buildGUICamera(SGPropertyNode* cameraNode,
 643                                         GraphicsWindow* window)
 644 {
 645     WindowBuilder *wBuild = WindowBuilder::getWindowBuilder();
 646     const SGPropertyNode* windowNode = (cameraNode
 647                                         ? cameraNode->getNode("window")
 648                                         : 0);
 649     if (!window) {
 650         if (windowNode) {
 651             // New style window declaration / definition
 652             window = wBuild->buildWindow(windowNode);
 653
 654         } else {
 655             return 0;
 656         }
 657     }
 658     Camera* camera = new Camera;
 659     camera->setAllowEventFocus(false);
 660     camera->setGraphicsContext(window->gc.get());
 661     camera->setViewport(new Viewport);
 662     // XXX Camera needs to be drawn last; eventually the render order
 663     // should be assigned by a camera manager.
 664     camera->setRenderOrder(osg::Camera::POST_RENDER, 100);
 665         camera->setClearMask(0);
 666     camera->setInheritanceMask(CullSettings::ALL_VARIABLES
 667                                & ~(CullSettings::COMPUTE_NEAR_FAR_MODE
 668                                    | CullSettings::CULLING_MODE
 669 #if defined(HAVE_CULLSETTINGS_CLEAR_MASK)
 670                                    | CullSettings::CLEAR_MASK
 671 #endif
 672                                    ));
 673     camera->setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR);
 674     camera->setCullingMode(osg::CullSettings::NO_CULLING);
 675     camera->setProjectionResizePolicy(Camera::FIXED);
 676     camera->setReferenceFrame(Transform::ABSOLUTE_RF);
 677     const int cameraFlags = GUI;
 678     CameraInfo* result = addCamera(cameraFlags, camera, Matrixd::identity(),
 679                                    Matrixd::identity(), false);
 680     SGPropertyNode* viewportNode = cameraNode->getNode("viewport", true);
 681     buildViewport(result, viewportNode, window->gc->getTraits());
 682
 683     // Disable statistics for the GUI camera.
 684     result->camera->setStats(0);
 685     updateCameras(result);
 686     return result;
 687 }
 688
 689 CameraGroup* CameraGroup::buildCameraGroup(osgViewer::Viewer* viewer,
 690                                            SGPropertyNode* gnode)
 691 {
 692     CameraGroup* cgroup = new CameraGroup(viewer);
 693     for (int i = 0; i < gnode->nChildren(); ++i) {
 694         SGPropertyNode* pNode = gnode->getChild(i);
 695         const char* name = pNode->getName();
 696         if (!strcmp(name, "camera")) {
 697             cgroup->buildCamera(pNode);
 698         } else if (!strcmp(name, "window")) {
 699             WindowBuilder::getWindowBuilder()->buildWindow(pNode);
 700         } else if (!strcmp(name, "gui")) {
 701             cgroup->buildGUICamera(pNode);
 702         }
 703     }
 704     bindMemberToNode(gnode, "znear", cgroup, &CameraGroup::_zNear, .1f);
 705     bindMemberToNode(gnode, "zfar", cgroup, &CameraGroup::_zFar, 120000.0f);
 706     bindMemberToNode(gnode, "near-field", cgroup, &CameraGroup::_nearField,
 707                      100.0f);
 708     return cgroup;
 709 }
 710
 711 void CameraGroup::setCameraCullMasks(Node::NodeMask nm)
 712 {
 713     for (CameraIterator i = camerasBegin(), e = camerasEnd(); i != e; ++i) {
 714         CameraInfo* info = i->get();
 715         if (info->flags & GUI)
 716             continue;
 717         if (info->farCamera.valid() && info->farCamera->getNodeMask() != 0) {
 718             info->camera->setCullMask(nm & ~simgear::BACKGROUND_BIT);
 719             info->camera->setCullMaskLeft(nm & ~simgear::BACKGROUND_BIT);
 720             info->camera->setCullMaskRight(nm & ~simgear::BACKGROUND_BIT);
 721             info->farCamera->setCullMask(nm);
 722             info->farCamera->setCullMaskLeft(nm);
 723             info->farCamera->setCullMaskRight(nm);
 724         } else {
 725             info->camera->setCullMask(nm);
 726             info->camera->setCullMaskLeft(nm);
 727             info->camera->setCullMaskRight(nm);
 728         }
 729     }
 730 }
 731
 732 void CameraGroup::resized()
 733 {
 734     for (CameraIterator i = camerasBegin(), e = camerasEnd(); i != e; ++i) {
 735         CameraInfo *info = i->get();
 736         const Viewport* viewport = info->camera->getViewport();
 737         info->x = viewport->x();
 738         info->y = viewport->y();
 739         info->width = viewport->width();
 740         info->height = viewport->height();
 741     }
 742 }
 743
 744 Camera* getGUICamera(CameraGroup* cgroup)
 745 {
 746     CameraGroup::CameraIterator end = cgroup->camerasEnd();
 747     CameraGroup::CameraIterator result
 748         = std::find_if(cgroup->camerasBegin(), end,
 749                        FlagTester<CameraInfo>(CameraGroup::GUI));
 750     if (result != end)
 751         return (*result)->camera.get();
 752     else
 753         return 0;
 754 }
 755
 756 bool computeIntersections(const CameraGroup* cgroup,
 757                           const osgGA::GUIEventAdapter* ea,
 758                           osgUtil::LineSegmentIntersector::Intersections& intersections)
 759 {
 760     using osgUtil::Intersector;
 761     using osgUtil::LineSegmentIntersector;
 762     double x, y;
 763     eventToWindowCoords(ea, x, y);
 764     // Find camera that contains event
 765     for (CameraGroup::ConstCameraIterator iter = cgroup->camerasBegin(),
 766              e = cgroup->camerasEnd();
 767          iter != e;
 768          ++iter) {
 769         const CameraInfo* cinfo = iter->get();
 770         if ((cinfo->flags & CameraGroup::DO_INTERSECTION_TEST) == 0)
 771             continue;
 772         const Camera* camera = cinfo->camera.get();
 773         if (camera->getGraphicsContext() != ea->getGraphicsContext())
 774             continue;
 775         const Viewport* viewport = camera->getViewport();
 776         double epsilon = 0.5;
 777         if (!(x >= viewport->x() - epsilon
 778               && x < viewport->x() + viewport->width() -1.0 + epsilon
 779               && y >= viewport->y() - epsilon
 780               && y < viewport->y() + viewport->height() -1.0 + epsilon))
 781             continue;
 782         Vec4d start(x, y, 0.0, 1.0);
 783         Vec4d end(x, y, 1.0, 1.0);
 784         Matrix windowMat = viewport->computeWindowMatrix();
 785         Matrix startPtMat = Matrix::inverse(camera->getProjectionMatrix()
 786                                             * windowMat);
 787         Matrix endPtMat;
 788         if (!cinfo->farCamera.valid() || cinfo->farCamera->getNodeMask() == 0)
 789             endPtMat = startPtMat;
 790         else
 791             endPtMat = Matrix::inverse(cinfo->farCamera->getProjectionMatrix()
 792                                        * windowMat);
 793         start = start * startPtMat;
 794         start /= start.w();
 795         end = end * endPtMat;
 796         end /= end.w();
 797         ref_ptr<LineSegmentIntersector> picker
 798             = new LineSegmentIntersector(Intersector::VIEW,
 799                                          Vec3d(start.x(), start.y(), start.z()),
 800                                          Vec3d(end.x(), end.y(), end.z()));
 801         osgUtil::IntersectionVisitor iv(picker.get());
 802         const_cast<Camera*>(camera)->accept(iv);
 803         if (picker->containsIntersections()) {
 804             intersections = picker->getIntersections();
 805             return true;
 806         } else {
 807             break;
 808         }
 809     }
 810     intersections.clear();
 811     return false;
 812 }
 813
 814 void warpGUIPointer(CameraGroup* cgroup, int x, int y)
 815 {
 816     using osgViewer::GraphicsWindow;
 817     Camera* guiCamera = getGUICamera(cgroup);
 818     if (!guiCamera)
 819         return;
 820     Viewport* vport = guiCamera->getViewport();
 821     GraphicsWindow* gw
 822         = dynamic_cast<GraphicsWindow*>(guiCamera->getGraphicsContext());
 823     if (!gw)
 824         return;
 825     globals->get_renderer()->getEventHandler()->setMouseWarped();
 826     // Translate the warp request into the viewport of the GUI camera,
 827     // send the request to the window, then transform the coordinates
 828     // for the Viewer's event queue.
 829     double wx = x + vport->x();
 830     double wyUp = vport->height() + vport->y() - y;
 831     double wy;
 832     const GraphicsContext::Traits* traits = gw->getTraits();
 833     if (gw->getEventQueue()->getCurrentEventState()->getMouseYOrientation()
 834         == osgGA::GUIEventAdapter::Y_INCREASING_DOWNWARDS) {
 835         wy = traits->height - wyUp;
 836     } else {
 837         wy = wyUp;
 838     }
 839     gw->getEventQueue()->mouseWarped(wx, wy);
 840     gw->requestWarpPointer(wx, wy);
 841     osgGA::GUIEventAdapter* eventState
 842         = cgroup->getViewer()->getEventQueue()->getCurrentEventState();
 843     double viewerX
 844         = (eventState->getXmin()
 845            + ((wx / double(traits->width))
 846               * (eventState->getXmax() - eventState->getXmin())));
 847     double viewerY
 848         = (eventState->getYmin()
 849            + ((wyUp / double(traits->height))
 850               * (eventState->getYmax() - eventState->getYmin())));
 851     cgroup->getViewer()->getEventQueue()->mouseWarped(viewerX, viewerY);
 852 }
 853 }