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.get());
 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 #if SG_OSG_VERSION_LESS_THAN(3,0,0)
 195         // refreshes camera viewports (for now)
 196         updateCameras(info);
 197 #endif
 198         Camera* camera = info->camera.get();
 199         Matrix viewMatrix;
 200         if ((info->flags & VIEW_ABSOLUTE) != 0)
 201             viewMatrix = slave._viewOffset;
 202         else
 203             viewMatrix = masterView * slave._viewOffset;
 204         camera->setViewMatrix(viewMatrix);
 205         Matrix projectionMatrix;
 206         if ((info->flags & PROJECTION_ABSOLUTE) != 0)
 207             projectionMatrix = slave._projectionOffset;
 208         else
 209             projectionMatrix = masterProj * slave._projectionOffset;
 210
 211         if (!info->farCamera.valid()) {
 212             camera->setProjectionMatrix(projectionMatrix);
 213         } else {
 214             Camera* farCamera = info->farCamera.get();
 215             farCamera->setViewMatrix(viewMatrix);
 216             double left, right, bottom, top, parentNear, parentFar;
 217             projectionMatrix.getFrustum(left, right, bottom, top,
 218                                         parentNear, parentFar);
 219             if (parentFar < _nearField || _nearField == 0.0f) {
 220                 camera->setProjectionMatrix(projectionMatrix);
 221                 camera->setCullMask(camera->getCullMask()
 222                                     | simgear::BACKGROUND_BIT);
 223                 camera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
 224                 farCamera->setNodeMask(0);
 225             } else {
 226                 Matrix nearProj, farProj;
 227                 makeNewProjMat(projectionMatrix, parentNear, _nearField,
 228                                nearProj);
 229                 makeNewProjMat(projectionMatrix, _nearField, parentFar,
 230                                farProj);
 231                 camera->setProjectionMatrix(nearProj);
 232                 camera->setCullMask(camera->getCullMask()
 233                                     & ~simgear::BACKGROUND_BIT);
 234                 camera->setClearMask(GL_DEPTH_BUFFER_BIT);
 235                 farCamera->setProjectionMatrix(farProj);
 236                 farCamera->setNodeMask(camera->getNodeMask());
 237             }
 238         }
 239     }
 240 }
 241
 242 void CameraGroup::setCameraParameters(float vfov, float aspectRatio)
 243 {
 244     if (vfov != 0.0f && aspectRatio != 0.0f)
 245         _viewer->getCamera()
 246             ->setProjectionMatrixAsPerspective(vfov,
 247                                                1.0f / aspectRatio,
 248                                                _zNear, _zFar);
 249 }
 250 }
 251
 252 namespace
 253 {
 254 // A raw value for property nodes that references a class member via
 255 // an osg::ref_ptr.
 256 template<class C, class T>
 257 class RefMember : public SGRawValue<T>
 258 {
 259 public:
 260     RefMember (C *obj, T C::*ptr)
 261         : _obj(obj), _ptr(ptr) {}
 262     virtual ~RefMember () {}
 263     virtual T getValue () const
 264     {
 265         return _obj.get()->*_ptr;
 266     }
 267     virtual bool setValue (T value)
 268     {
 269         _obj.get()->*_ptr = value;
 270         return true;
 271     }
 272     virtual SGRawValue<T> * clone () const
 273     {
 274         return new RefMember(_obj.get(), _ptr);
 275     }
 276 private:
 277     ref_ptr<C> _obj;
 278     T C::* const _ptr;
 279 };
 280
 281 template<typename C, typename T>
 282 RefMember<C, T> makeRefMember(C *obj, T C::*ptr)
 283 {
 284     return RefMember<C, T>(obj, ptr);
 285 }
 286
 287 template<typename C, typename T>
 288 void bindMemberToNode(SGPropertyNode* parent, const char* childName,
 289                       C* obj, T C::*ptr, T value)
 290 {
 291     SGPropertyNode* valNode = parent->getNode(childName);
 292     RefMember<C, T> refMember = makeRefMember(obj, ptr);
 293     if (!valNode) {
 294         valNode = parent->getNode(childName, true);
 295         valNode->tie(refMember, false);
 296         setValue(valNode, value);
 297     } else {
 298         valNode->tie(refMember, true);
 299     }
 300 }
 301
 302 void buildViewport(flightgear::CameraInfo* info, SGPropertyNode* viewportNode,
 303                    const osg::GraphicsContext::Traits *traits)
 304 {
 305     using namespace flightgear;
 306     bindMemberToNode(viewportNode, "x", info, &CameraInfo::x, 0.0);
 307     bindMemberToNode(viewportNode, "y", info, &CameraInfo::y, 0.0);
 308     bindMemberToNode(viewportNode, "width", info, &CameraInfo::width,
 309                      static_cast<double>(traits->width));
 310     bindMemberToNode(viewportNode, "height", info, &CameraInfo::height,
 311                      static_cast<double>(traits->height));
 312 }
 313 }
 314
 315 namespace flightgear
 316 {
 317
 318 // Mostly copied from osg's osgViewer/View.cpp
 319
 320 static osg::Geometry* createParoramicSphericalDisplayDistortionMesh(
 321     const Vec3& origin, const Vec3& widthVector, const Vec3& heightVector,
 322     double sphere_radius, double collar_radius,
 323     Image* intensityMap = 0, const Matrix& projectorMatrix = Matrix())
 324 {
 325     osg::Vec3d center(0.0,0.0,0.0);
 326     osg::Vec3d eye(0.0,0.0,0.0);
 327
 328     double distance = sqrt(sphere_radius*sphere_radius - collar_radius*collar_radius);
 329     bool flip = false;
 330     bool texcoord_flip = false;
 331
 332     osg::Vec3d projector = eye - osg::Vec3d(0.0,0.0, distance);
 333
 334 #if 0
 335     OSG_INFO<<"createParoramicSphericalDisplayDistortionMesh : Projector position = "<<projector<<std::endl;
 336     OSG_INFO<<"createParoramicSphericalDisplayDistortionMesh : distance = "<<distance<<std::endl;
 337 #endif
 338     // create the quad to visualize.
 339     osg::Geometry* geometry = new osg::Geometry();
 340
 341     geometry->setSupportsDisplayList(false);
 342
 343     osg::Vec3 xAxis(widthVector);
 344     float width = widthVector.length();
 345     xAxis /= width;
 346
 347     osg::Vec3 yAxis(heightVector);
 348     float height = heightVector.length();
 349     yAxis /= height;
 350
 351     int noSteps = 160;
 352
 353     osg::Vec3Array* vertices = new osg::Vec3Array;
 354     osg::Vec2Array* texcoords0 = new osg::Vec2Array;
 355     osg::Vec2Array* texcoords1 = intensityMap==0 ? new osg::Vec2Array : 0;
 356     osg::Vec4Array* colors = new osg::Vec4Array;
 357
 358     osg::Vec3 bottom = origin;
 359     osg::Vec3 dx = xAxis*(width/((float)(noSteps-2)));
 360     osg::Vec3 dy = yAxis*(height/((float)(noSteps-1)));
 361
 362     osg::Vec3 top = origin + yAxis*height;
 363
 364     osg::Vec3 screenCenter = origin + widthVector*0.5f + heightVector*0.5f;
 365     float screenRadius = heightVector.length() * 0.5f;
 366
 367     geometry->getOrCreateStateSet()->setMode(GL_CULL_FACE, osg::StateAttribute::OFF | osg::StateAttribute::PROTECTED);
 368
 369     for(int i=0;i<noSteps;++i)
 370     {
 371         osg::Vec3 cursor = bottom+dy*(float)i;
 372         for(int j=0;j<noSteps;++j)
 373         {
 374             osg::Vec2 texcoord(double(i)/double(noSteps-1), double(j)/double(noSteps-1));
 375             double theta = texcoord.x() * 2.0 * osg::PI;
 376             double phi = (1.0-texcoord.y()) * osg::PI;
 377
 378             if (texcoord_flip) texcoord.y() = 1.0f - texcoord.y();
 379
 380             osg::Vec3 pos(sin(phi)*sin(theta), sin(phi)*cos(theta), cos(phi));
 381             pos = pos*projectorMatrix;
 382
 383             double alpha = atan2(pos.x(), pos.y());
 384             if (alpha<0.0) alpha += 2.0*osg::PI;
 385
 386             double beta = atan2(sqrt(pos.x()*pos.x() + pos.y()*pos.y()), pos.z());
 387             if (beta<0.0) beta += 2.0*osg::PI;
 388
 389             double gamma = atan2(sqrt(double(pos.x()*pos.x() + pos.y()*pos.y())), double(pos.z()+distance));
 390             if (gamma<0.0) gamma += 2.0*osg::PI;
 391
 392
 393             osg::Vec3 v = screenCenter + osg::Vec3(sin(alpha)*gamma*2.0/osg::PI, -cos(alpha)*gamma*2.0/osg::PI, 0.0f)*screenRadius;
 394
 395             if (flip)
 396                 vertices->push_back(osg::Vec3(v.x(), top.y()-(v.y()-origin.y()),v.z()));
 397             else
 398                 vertices->push_back(v);
 399
 400             texcoords0->push_back( texcoord );
 401
 402             osg::Vec2 texcoord1(alpha/(2.0*osg::PI), 1.0f - beta/osg::PI);
 403             if (intensityMap)
 404             {
 405                 colors->push_back(intensityMap->getColor(texcoord1));
 406             }
 407             else
 408             {
 409                 colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
 410                 if (texcoords1) texcoords1->push_back( texcoord1 );
 411             }
 412
 413
 414         }
 415     }
 416
 417
 418     // pass the created vertex array to the points geometry object.
 419     geometry->setVertexArray(vertices);
 420
 421     geometry->setColorArray(colors);
 422     geometry->setColorBinding(osg::Geometry::BIND_PER_VERTEX);
 423
 424     geometry->setTexCoordArray(0,texcoords0);
 425     if (texcoords1) geometry->setTexCoordArray(1,texcoords1);
 426
 427     osg::DrawElementsUShort* elements = new osg::DrawElementsUShort(osg::PrimitiveSet::TRIANGLES);
 428     geometry->addPrimitiveSet(elements);
 429
 430     for(int i=0;i<noSteps-1;++i)
 431     {
 432         for(int j=0;j<noSteps-1;++j)
 433         {
 434             int i1 = j+(i+1)*noSteps;
 435             int i2 = j+(i)*noSteps;
 436             int i3 = j+1+(i)*noSteps;
 437             int i4 = j+1+(i+1)*noSteps;
 438
 439             osg::Vec3& v1 = (*vertices)[i1];
 440             osg::Vec3& v2 = (*vertices)[i2];
 441             osg::Vec3& v3 = (*vertices)[i3];
 442             osg::Vec3& v4 = (*vertices)[i4];
 443
 444             if ((v1-screenCenter).length()>screenRadius) continue;
 445             if ((v2-screenCenter).length()>screenRadius) continue;
 446             if ((v3-screenCenter).length()>screenRadius) continue;
 447             if ((v4-screenCenter).length()>screenRadius) continue;
 448
 449             elements->push_back(i1);
 450             elements->push_back(i2);
 451             elements->push_back(i3);
 452
 453             elements->push_back(i1);
 454             elements->push_back(i3);
 455             elements->push_back(i4);
 456         }
 457     }
 458
 459     return geometry;
 460 }
 461
 462 void CameraGroup::buildDistortionCamera(const SGPropertyNode* psNode,
 463                                         Camera* camera)
 464 {
 465     const SGPropertyNode* texNode = psNode->getNode("texture");
 466     if (!texNode) {
 467         // error
 468         return;
 469     }
 470     string texName = texNode->getStringValue();
 471     TextureMap::iterator itr = _textureTargets.find(texName);
 472     if (itr == _textureTargets.end()) {
 473         // error
 474         return;
 475     }
 476     Viewport* viewport = camera->getViewport();
 477     float width = viewport->width();
 478     float height = viewport->height();
 479     TextureRectangle* texRect = itr->second.get();
 480     double radius = psNode->getDoubleValue("radius", 1.0);
 481     double collar = psNode->getDoubleValue("collar", 0.45);
 482     Geode* geode = new Geode();
 483     geode->addDrawable(createParoramicSphericalDisplayDistortionMesh(
 484                            Vec3(0.0f,0.0f,0.0f), Vec3(width,0.0f,0.0f),
 485                            Vec3(0.0f,height,0.0f), radius, collar));
 486
 487     // new we need to add the texture to the mesh, we do so by creating a
 488     // StateSet to contain the Texture StateAttribute.
 489     StateSet* stateset = geode->getOrCreateStateSet();
 490     stateset->setTextureAttributeAndModes(0, texRect, StateAttribute::ON);
 491     stateset->setMode(GL_LIGHTING, StateAttribute::OFF);
 492
 493     TexMat* texmat = new TexMat;
 494     texmat->setScaleByTextureRectangleSize(true);
 495     stateset->setTextureAttributeAndModes(0, texmat, osg::StateAttribute::ON);
 496 #if 0
 497     if (!applyIntensityMapAsColours && intensityMap)
 498     {
 499         stateset->setTextureAttributeAndModes(1, new osg::Texture2D(intensityMap), osg::StateAttribute::ON);
 500     }
 501 #endif
 502     // add subgraph to render
 503     camera->addChild(geode);
 504     camera->setClearMask(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
 505     camera->setClearColor(osg::Vec4(0.0, 0.0, 0.0, 1.0));
 506     camera->setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR);
 507     camera->setCullingMode(osg::CullSettings::NO_CULLING);
 508     camera->setName("DistortionCorrectionCamera");
 509 }
 510
 511 CameraInfo* CameraGroup::buildCamera(SGPropertyNode* cameraNode)
 512 {
 513     WindowBuilder *wBuild = WindowBuilder::getWindowBuilder();
 514     const SGPropertyNode* windowNode = cameraNode->getNode("window");
 515     GraphicsWindow* window = 0;
 516     int cameraFlags = DO_INTERSECTION_TEST;
 517     if (windowNode) {
 518         // New style window declaration / definition
 519         window = wBuild->buildWindow(windowNode);
 520     } else {
 521         // Old style: suck window params out of camera block
 522         window = wBuild->buildWindow(cameraNode);
 523     }
 524     if (!window) {
 525         return 0;
 526     }
 527     Camera* camera = new Camera;
 528     camera->setAllowEventFocus(false);
 529     camera->setGraphicsContext(window->gc.get());
 530     camera->setViewport(new Viewport);
 531     camera->setCullingMode(CullSettings::SMALL_FEATURE_CULLING
 532                            | CullSettings::VIEW_FRUSTUM_CULLING);
 533     camera->setInheritanceMask(CullSettings::ALL_VARIABLES
 534                                & ~(CullSettings::CULL_MASK
 535                                    | CullSettings::CULLING_MODE
 536 #if defined(HAVE_CULLSETTINGS_CLEAR_MASK)
 537                                    | CullSettings::CLEAR_MASK
 538 #endif
 539                                    ));
 540
 541     osg::Matrix pOff;
 542     osg::Matrix vOff;
 543     const SGPropertyNode* viewNode = cameraNode->getNode("view");
 544     if (viewNode) {
 545         double heading = viewNode->getDoubleValue("heading-deg", 0.0);
 546         double pitch = viewNode->getDoubleValue("pitch-deg", 0.0);
 547         double roll = viewNode->getDoubleValue("roll-deg", 0.0);
 548         double x = viewNode->getDoubleValue("x", 0.0);
 549         double y = viewNode->getDoubleValue("y", 0.0);
 550         double z = viewNode->getDoubleValue("z", 0.0);
 551         // Build a view matrix, which is the inverse of a model
 552         // orientation matrix.
 553         vOff = (Matrix::translate(-x, -y, -z)
 554                 * Matrix::rotate(-DegreesToRadians(heading),
 555                                  Vec3d(0.0, 1.0, 0.0),
 556                                  -DegreesToRadians(pitch),
 557                                  Vec3d(1.0, 0.0, 0.0),
 558                                  -DegreesToRadians(roll),
 559                                  Vec3d(0.0, 0.0, 1.0)));
 560         if (viewNode->getBoolValue("absolute", false))
 561             cameraFlags |= VIEW_ABSOLUTE;
 562     } else {
 563         // Old heading parameter, works in the opposite direction
 564         double heading = cameraNode->getDoubleValue("heading-deg", 0.0);
 565         vOff.makeRotate(DegreesToRadians(heading), osg::Vec3(0, 1, 0));
 566     }
 567     const SGPropertyNode* projectionNode = 0;
 568     if ((projectionNode = cameraNode->getNode("perspective")) != 0) {
 569         double fovy = projectionNode->getDoubleValue("fovy-deg", 55.0);
 570         double aspectRatio = projectionNode->getDoubleValue("aspect-ratio",
 571                                                             1.0);
 572         double zNear = projectionNode->getDoubleValue("near", 0.0);
 573         double zFar = projectionNode->getDoubleValue("far", 0.0);
 574         double offsetX = projectionNode->getDoubleValue("offset-x", 0.0);
 575         double offsetY = projectionNode->getDoubleValue("offset-y", 0.0);
 576         double tan_fovy = tan(DegreesToRadians(fovy*0.5));
 577         double right = tan_fovy * aspectRatio * zNear + offsetX;
 578         double left = -tan_fovy * aspectRatio * zNear + offsetX;
 579         double top = tan_fovy * zNear + offsetY;
 580         double bottom = -tan_fovy * zNear + offsetY;
 581         pOff.makeFrustum(left, right, bottom, top, zNear, zFar);
 582         cameraFlags |= PROJECTION_ABSOLUTE;
 583     } else if ((projectionNode = cameraNode->getNode("frustum")) != 0
 584                || (projectionNode = cameraNode->getNode("ortho")) != 0) {
 585         double top = projectionNode->getDoubleValue("top", 0.0);
 586         double bottom = projectionNode->getDoubleValue("bottom", 0.0);
 587         double left = projectionNode->getDoubleValue("left", 0.0);
 588         double right = projectionNode->getDoubleValue("right", 0.0);
 589         double zNear = projectionNode->getDoubleValue("near", 0.0);
 590         double zFar = projectionNode->getDoubleValue("far", 0.0);
 591         if (cameraNode->getNode("frustum")) {
 592             pOff.makeFrustum(left, right, bottom, top, zNear, zFar);
 593             cameraFlags |= PROJECTION_ABSOLUTE;
 594         } else {
 595             pOff.makeOrtho(left, right, bottom, top, zNear, zFar);
 596             cameraFlags |= (PROJECTION_ABSOLUTE | ORTHO);
 597         }
 598     } else {
 599         // old style shear parameters
 600         double shearx = cameraNode->getDoubleValue("shear-x", 0);
 601         double sheary = cameraNode->getDoubleValue("shear-y", 0);
 602         pOff.makeTranslate(-shearx, -sheary, 0);
 603     }
 604     const SGPropertyNode* textureNode = cameraNode->getNode("texture");
 605     if (textureNode) {
 606         string texName = textureNode->getStringValue("name");
 607         int tex_width = textureNode->getIntValue("width");
 608         int tex_height = textureNode->getIntValue("height");
 609         TextureRectangle* texture = new TextureRectangle;
 610
 611         texture->setTextureSize(tex_width, tex_height);
 612         texture->setInternalFormat(GL_RGB);
 613         texture->setFilter(Texture::MIN_FILTER, Texture::LINEAR);
 614         texture->setFilter(Texture::MAG_FILTER, Texture::LINEAR);
 615         texture->setWrap(Texture::WRAP_S, Texture::CLAMP_TO_EDGE);
 616         texture->setWrap(Texture::WRAP_T, Texture::CLAMP_TO_EDGE);
 617         camera->setDrawBuffer(GL_FRONT);
 618         camera->setReadBuffer(GL_FRONT);
 619         camera->setRenderTargetImplementation(Camera::FRAME_BUFFER_OBJECT);
 620         camera->attach(Camera::COLOR_BUFFER, texture);
 621         _textureTargets[texName] = texture;
 622     } else {
 623         camera->setDrawBuffer(GL_BACK);
 624         camera->setReadBuffer(GL_BACK);
 625     }
 626     const SGPropertyNode* psNode = cameraNode->getNode("panoramic-spherical");
 627     bool useMasterSceneGraph = !psNode;
 628     CameraInfo* info = addCamera(cameraFlags, camera, vOff, pOff,
 629                                  useMasterSceneGraph);
 630     // If a viewport isn't set on the camera, then it's hard to dig it
 631     // out of the SceneView objects in the viewer, and the coordinates
 632     // of mouse events are somewhat bizzare.
 633     SGPropertyNode* viewportNode = cameraNode->getNode("viewport", true);
 634     buildViewport(info, viewportNode, window->gc->getTraits());
 635     updateCameras(info);
 636     // Distortion camera needs the viewport which is created by addCamera().
 637     if (psNode) {
 638         info->flags = info->flags | VIEW_ABSOLUTE;
 639         buildDistortionCamera(psNode, camera);
 640     }
 641     return info;
 642 }
 643
 644 CameraInfo* CameraGroup::buildGUICamera(SGPropertyNode* cameraNode,
 645                                         GraphicsWindow* window)
 646 {
 647     WindowBuilder *wBuild = WindowBuilder::getWindowBuilder();
 648     const SGPropertyNode* windowNode = (cameraNode
 649                                         ? cameraNode->getNode("window")
 650                                         : 0);
 651     if (!window && windowNode) {
 652       // New style window declaration / definition
 653       window = wBuild->buildWindow(windowNode);
 654     }
 655
 656     if (!window) { // buildWindow can fail
 657       SG_LOG(SG_GENERAL, SG_WARN, "CameraGroup::buildGUICamera: failed to build a window");
 658       return NULL;
 659     }
 660
 661     Camera* camera = new Camera;
 662     camera->setAllowEventFocus(false);
 663     camera->setGraphicsContext(window->gc.get());
 664     camera->setViewport(new Viewport);
 665     // XXX Camera needs to be drawn last; eventually the render order
 666     // should be assigned by a camera manager.
 667     camera->setRenderOrder(osg::Camera::POST_RENDER, 100);
 668         camera->setClearMask(0);
 669     camera->setInheritanceMask(CullSettings::ALL_VARIABLES
 670                                & ~(CullSettings::COMPUTE_NEAR_FAR_MODE
 671                                    | CullSettings::CULLING_MODE
 672 #if defined(HAVE_CULLSETTINGS_CLEAR_MASK)
 673                                    | CullSettings::CLEAR_MASK
 674 #endif
 675                                    ));
 676     camera->setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR);
 677     camera->setCullingMode(osg::CullSettings::NO_CULLING);
 678     camera->setProjectionResizePolicy(Camera::FIXED);
 679     camera->setReferenceFrame(Transform::ABSOLUTE_RF);
 680     const int cameraFlags = GUI;
 681     CameraInfo* result = addCamera(cameraFlags, camera, Matrixd::identity(),
 682                                    Matrixd::identity(), false);
 683     SGPropertyNode* viewportNode = cameraNode->getNode("viewport", true);
 684     buildViewport(result, viewportNode, window->gc->getTraits());
 685
 686     // Disable statistics for the GUI camera.
 687     result->camera->setStats(0);
 688     updateCameras(result);
 689     return result;
 690 }
 691
 692 CameraGroup* CameraGroup::buildCameraGroup(osgViewer::Viewer* viewer,
 693                                            SGPropertyNode* gnode)
 694 {
 695     CameraGroup* cgroup = new CameraGroup(viewer);
 696     for (int i = 0; i < gnode->nChildren(); ++i) {
 697         SGPropertyNode* pNode = gnode->getChild(i);
 698         const char* name = pNode->getName();
 699         if (!strcmp(name, "camera")) {
 700             cgroup->buildCamera(pNode);
 701         } else if (!strcmp(name, "window")) {
 702             WindowBuilder::getWindowBuilder()->buildWindow(pNode);
 703         } else if (!strcmp(name, "gui")) {
 704             cgroup->buildGUICamera(pNode);
 705         }
 706     }
 707     bindMemberToNode(gnode, "znear", cgroup, &CameraGroup::_zNear, .1f);
 708     bindMemberToNode(gnode, "zfar", cgroup, &CameraGroup::_zFar, 120000.0f);
 709     bindMemberToNode(gnode, "near-field", cgroup, &CameraGroup::_nearField,
 710                      100.0f);
 711     return cgroup;
 712 }
 713
 714 void CameraGroup::setCameraCullMasks(Node::NodeMask nm)
 715 {
 716     for (CameraIterator i = camerasBegin(), e = camerasEnd(); i != e; ++i) {
 717         CameraInfo* info = i->get();
 718         if (info->flags & GUI)
 719             continue;
 720         if (info->farCamera.valid() && info->farCamera->getNodeMask() != 0) {
 721             info->camera->setCullMask(nm & ~simgear::BACKGROUND_BIT);
 722             info->camera->setCullMaskLeft(nm & ~simgear::BACKGROUND_BIT);
 723             info->camera->setCullMaskRight(nm & ~simgear::BACKGROUND_BIT);
 724             info->farCamera->setCullMask(nm);
 725             info->farCamera->setCullMaskLeft(nm);
 726             info->farCamera->setCullMaskRight(nm);
 727         } else {
 728             info->camera->setCullMask(nm);
 729             info->camera->setCullMaskLeft(nm);
 730             info->camera->setCullMaskRight(nm);
 731         }
 732     }
 733 }
 734
 735 void CameraGroup::resized()
 736 {
 737     for (CameraIterator i = camerasBegin(), e = camerasEnd(); i != e; ++i) {
 738         CameraInfo *info = i->get();
 739         const Viewport* viewport = info->camera->getViewport();
 740         info->x = viewport->x();
 741         info->y = viewport->y();
 742         info->width = viewport->width();
 743         info->height = viewport->height();
 744     }
 745 }
 746
 747 Camera* getGUICamera(CameraGroup* cgroup)
 748 {
 749     CameraGroup::CameraIterator end = cgroup->camerasEnd();
 750     CameraGroup::CameraIterator result
 751         = std::find_if(cgroup->camerasBegin(), end,
 752                        FlagTester<CameraInfo>(CameraGroup::GUI));
 753     if (result != end)
 754         return (*result)->camera.get();
 755     else
 756         return 0;
 757 }
 758
 759 bool computeIntersections(const CameraGroup* cgroup,
 760                           const osgGA::GUIEventAdapter* ea,
 761                           osgUtil::LineSegmentIntersector::Intersections& intersections)
 762 {
 763     using osgUtil::Intersector;
 764     using osgUtil::LineSegmentIntersector;
 765     double x, y;
 766     eventToWindowCoords(ea, x, y);
 767     // Find camera that contains event
 768     for (CameraGroup::ConstCameraIterator iter = cgroup->camerasBegin(),
 769              e = cgroup->camerasEnd();
 770          iter != e;
 771          ++iter) {
 772         const CameraInfo* cinfo = iter->get();
 773         if ((cinfo->flags & CameraGroup::DO_INTERSECTION_TEST) == 0)
 774             continue;
 775         const Camera* camera = cinfo->camera.get();
 776         if (camera->getGraphicsContext() != ea->getGraphicsContext())
 777             continue;
 778         const Viewport* viewport = camera->getViewport();
 779         double epsilon = 0.5;
 780         if (!(x >= viewport->x() - epsilon
 781               && x < viewport->x() + viewport->width() -1.0 + epsilon
 782               && y >= viewport->y() - epsilon
 783               && y < viewport->y() + viewport->height() -1.0 + epsilon))
 784             continue;
 785         Vec4d start(x, y, 0.0, 1.0);
 786         Vec4d end(x, y, 1.0, 1.0);
 787         Matrix windowMat = viewport->computeWindowMatrix();
 788         Matrix startPtMat = Matrix::inverse(camera->getProjectionMatrix()
 789                                             * windowMat);
 790         Matrix endPtMat;
 791         if (!cinfo->farCamera.valid() || cinfo->farCamera->getNodeMask() == 0)
 792             endPtMat = startPtMat;
 793         else
 794             endPtMat = Matrix::inverse(cinfo->farCamera->getProjectionMatrix()
 795                                        * windowMat);
 796         start = start * startPtMat;
 797         start /= start.w();
 798         end = end * endPtMat;
 799         end /= end.w();
 800         ref_ptr<LineSegmentIntersector> picker
 801             = new LineSegmentIntersector(Intersector::VIEW,
 802                                          Vec3d(start.x(), start.y(), start.z()),
 803                                          Vec3d(end.x(), end.y(), end.z()));
 804         osgUtil::IntersectionVisitor iv(picker.get());
 805         const_cast<Camera*>(camera)->accept(iv);
 806         if (picker->containsIntersections()) {
 807             intersections = picker->getIntersections();
 808             return true;
 809         } else {
 810             break;
 811         }
 812     }
 813     intersections.clear();
 814     return false;
 815 }
 816
 817 void warpGUIPointer(CameraGroup* cgroup, int x, int y)
 818 {
 819     using osgViewer::GraphicsWindow;
 820     Camera* guiCamera = getGUICamera(cgroup);
 821     if (!guiCamera)
 822         return;
 823     Viewport* vport = guiCamera->getViewport();
 824     GraphicsWindow* gw
 825         = dynamic_cast<GraphicsWindow*>(guiCamera->getGraphicsContext());
 826     if (!gw)
 827         return;
 828     globals->get_renderer()->getEventHandler()->setMouseWarped();
 829     // Translate the warp request into the viewport of the GUI camera,
 830     // send the request to the window, then transform the coordinates
 831     // for the Viewer's event queue.
 832     double wx = x + vport->x();
 833     double wyUp = vport->height() + vport->y() - y;
 834     double wy;
 835     const GraphicsContext::Traits* traits = gw->getTraits();
 836     if (gw->getEventQueue()->getCurrentEventState()->getMouseYOrientation()
 837         == osgGA::GUIEventAdapter::Y_INCREASING_DOWNWARDS) {
 838         wy = traits->height - wyUp;
 839     } else {
 840         wy = wyUp;
 841     }
 842     gw->getEventQueue()->mouseWarped(wx, wy);
 843     gw->requestWarpPointer(wx, wy);
 844     osgGA::GUIEventAdapter* eventState
 845         = cgroup->getViewer()->getEventQueue()->getCurrentEventState();
 846     double viewerX
 847         = (eventState->getXmin()
 848            + ((wx / double(traits->width))
 849               * (eventState->getXmax() - eventState->getXmin())));
 850     double viewerY
 851         = (eventState->getYmin()
 852            + ((wyUp / double(traits->height))
 853               * (eventState->getYmax() - eventState->getYmin())));
 854     cgroup->getViewer()->getEventQueue()->mouseWarped(viewerX, viewerY);
 855 }
 856 }