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 "globals.hxx"
  25 #include "renderer.hxx"
  26 #include "FGEventHandler.hxx"
  27 #include "WindowBuilder.hxx"
  28 #include "WindowSystemAdapter.hxx"
  29 #include <simgear/props/props.hxx>
  30 #include <simgear/structure/OSGUtils.hxx>
  31 #include <simgear/structure/OSGVersion.hxx>
  32 #include <simgear/scene/material/EffectCullVisitor.hxx>
  33 #include <simgear/scene/util/RenderConstants.hxx>
  34
  35 #include <algorithm>
  36 #include <cstring>
  37 #include <string>
  38
  39 #include <osg/Camera>
  40 #include <osg/Geometry>
  41 #include <osg/GraphicsContext>
  42 #include <osg/io_utils>
  43 #include <osg/Math>
  44 #include <osg/Matrix>
  45 #include <osg/Notify>
  46 #include <osg/Program>
  47 #include <osg/Quat>
  48 #include <osg/TexMat>
  49 #include <osg/Vec3d>
  50 #include <osg/Viewport>
  51
  52 #include <osgUtil/IntersectionVisitor>
  53
  54 #include <osgViewer/GraphicsWindow>
  55 #include <osgViewer/Renderer>
  56
  57 namespace flightgear
  58 {
  59 using namespace osg;
  60
  61 using std::strcmp;
  62 using std::string;
  63
  64 ref_ptr<CameraGroup> CameraGroup::_defaultGroup;
  65
  66 CameraGroup::CameraGroup(osgViewer::Viewer* viewer) :
  67     _viewer(viewer)
  68 {
  69 }
  70
  71 }
  72
  73 namespace
  74 {
  75 using namespace osg;
  76
  77 // Given a projection matrix, return a new one with the same frustum
  78 // sides and new near / far values.
  79
  80 void makeNewProjMat(Matrixd& oldProj, double znear,
  81                                        double zfar, Matrixd& projection)
  82 {
  83     projection = oldProj;
  84     // Slightly inflate the near & far planes to avoid objects at the
  85     // extremes being clipped out.
  86     znear *= 0.999;
  87     zfar *= 1.001;
  88
  89     // Clamp the projection matrix z values to the range (near, far)
  90     double epsilon = 1.0e-6;
  91     if (fabs(projection(0,3)) < epsilon &&
  92         fabs(projection(1,3)) < epsilon &&
  93         fabs(projection(2,3)) < epsilon) {
  94         // Projection is Orthographic
  95         epsilon = -1.0/(zfar - znear); // Used as a temp variable
  96         projection(2,2) = 2.0*epsilon;
  97         projection(3,2) = (zfar + znear)*epsilon;
  98     } else {
  99         // Projection is Perspective
 100         double trans_near = (-znear*projection(2,2) + projection(3,2)) /
 101             (-znear*projection(2,3) + projection(3,3));
 102         double trans_far = (-zfar*projection(2,2) + projection(3,2)) /
 103             (-zfar*projection(2,3) + projection(3,3));
 104         double ratio = fabs(2.0/(trans_near - trans_far));
 105         double center = -0.5*(trans_near + trans_far);
 106
 107         projection.postMult(osg::Matrixd(1.0, 0.0, 0.0, 0.0,
 108                                          0.0, 1.0, 0.0, 0.0,
 109                                          0.0, 0.0, ratio, 0.0,
 110                                          0.0, 0.0, center*ratio, 1.0));
 111     }
 112 }
 113
 114 void installCullVisitor(Camera* camera)
 115 {
 116     osgViewer::Renderer* renderer
 117         = static_cast<osgViewer::Renderer*>(camera->getRenderer());
 118     for (int i = 0; i < 2; ++i) {
 119         osgUtil::SceneView* sceneView = renderer->getSceneView(i);
 120 #if SG_OSG_VERSION_LESS_THAN(3,0,0)
 121         sceneView->setCullVisitor(new simgear::EffectCullVisitor);
 122 #else
 123         osg::ref_ptr<osgUtil::CullVisitor::Identifier> identifier;
 124         identifier = sceneView->getCullVisitor()->getIdentifier();
 125         sceneView->setCullVisitor(new simgear::EffectCullVisitor);
 126         sceneView->getCullVisitor()->setIdentifier(identifier.get());
 127
 128         identifier = sceneView->getCullVisitorLeft()->getIdentifier();
 129         sceneView->setCullVisitorLeft(sceneView->getCullVisitor()->clone());
 130         sceneView->getCullVisitorLeft()->setIdentifier(identifier.get());
 131
 132         identifier = sceneView->getCullVisitorRight()->getIdentifier();
 133         sceneView->setCullVisitorRight(sceneView->getCullVisitor()->clone());
 134         sceneView->getCullVisitorRight()->setIdentifier(identifier.get());
 135 #endif
 136     }
 137 }
 138 }
 139
 140 namespace flightgear
 141 {
 142 void updateCameras(const CameraInfo* info)
 143 {
 144     if (info->camera.valid())
 145         info->camera->getViewport()->setViewport(info->x, info->y,
 146                                                  info->width, info->height);
 147     if (info->farCamera.valid())
 148         info->farCamera->getViewport()->setViewport(info->x, info->y,
 149                                                     info->width, info->height);
 150 }
 151
 152 CameraInfo* CameraGroup::addCamera(unsigned flags, Camera* camera,
 153                                    const Matrix& view,
 154                                    const Matrix& projection,
 155                                    bool useMasterSceneData)
 156 {
 157     CameraInfo* info = new CameraInfo(flags);
 158     // The camera group will always update the camera
 159     camera->setReferenceFrame(Transform::ABSOLUTE_RF);
 160
 161     Camera* farCamera = 0;
 162     if ((flags & (GUI | ORTHO)) == 0) {
 163         farCamera = new Camera;
 164         farCamera->setAllowEventFocus(camera->getAllowEventFocus());
 165         farCamera->setGraphicsContext(camera->getGraphicsContext());
 166         farCamera->setCullingMode(camera->getCullingMode());
 167         farCamera->setInheritanceMask(camera->getInheritanceMask());
 168         farCamera->setReferenceFrame(Transform::ABSOLUTE_RF);
 169         // Each camera's viewport is written when the window is
 170         // resized; if the the viewport isn't copied here, it gets updated
 171         // twice and ends up with the wrong value.
 172         farCamera->setViewport(simgear::clone(camera->getViewport()));
 173         farCamera->setDrawBuffer(camera->getDrawBuffer());
 174         farCamera->setReadBuffer(camera->getReadBuffer());
 175         farCamera->setRenderTargetImplementation(
 176             camera->getRenderTargetImplementation());
 177         const Camera::BufferAttachmentMap& bufferMap
 178             = camera->getBufferAttachmentMap();
 179         if (bufferMap.count(Camera::COLOR_BUFFER) != 0) {
 180             farCamera->attach(
 181                 Camera::COLOR_BUFFER,
 182                 bufferMap.find(Camera::COLOR_BUFFER)->second._texture.get());
 183         }
 184         _viewer->addSlave(farCamera, projection, view, useMasterSceneData);
 185         installCullVisitor(farCamera);
 186         info->farCamera = farCamera;
 187         info->farSlaveIndex = _viewer->getNumSlaves() - 1;
 188         farCamera->setRenderOrder(Camera::POST_RENDER, info->farSlaveIndex);
 189         camera->setCullMask(camera->getCullMask() & ~simgear::BACKGROUND_BIT);
 190         camera->setClearMask(GL_DEPTH_BUFFER_BIT);
 191     }
 192     _viewer->addSlave(camera, projection, view, useMasterSceneData);
 193     installCullVisitor(camera);
 194     info->camera = camera;
 195     info->slaveIndex = _viewer->getNumSlaves() - 1;
 196     camera->setRenderOrder(Camera::POST_RENDER, info->slaveIndex);
 197     _cameras.push_back(info);
 198     return info;
 199 }
 200
 201 void CameraGroup::update(const osg::Vec3d& position,
 202                          const osg::Quat& orientation)
 203 {
 204     const Matrix masterView(osg::Matrix::translate(-position)
 205                             * osg::Matrix::rotate(orientation.inverse()));
 206     _viewer->getCamera()->setViewMatrix(masterView);
 207     const Matrix& masterProj = _viewer->getCamera()->getProjectionMatrix();
 208     for (CameraList::iterator i = _cameras.begin(); i != _cameras.end(); ++i) {
 209         const CameraInfo* info = i->get();
 210         const View::Slave& slave = _viewer->getSlave(info->slaveIndex);
 211 #if SG_OSG_VERSION_LESS_THAN(3,0,0)
 212         // refreshes camera viewports (for now)
 213         updateCameras(info);
 214 #endif
 215         Camera* camera = info->camera.get();
 216         Matrix viewMatrix;
 217         if ((info->flags & VIEW_ABSOLUTE) != 0)
 218             viewMatrix = slave._viewOffset;
 219         else
 220             viewMatrix = masterView * slave._viewOffset;
 221         camera->setViewMatrix(viewMatrix);
 222         Matrix projectionMatrix;
 223         if ((info->flags & PROJECTION_ABSOLUTE) != 0)
 224             projectionMatrix = slave._projectionOffset;
 225         else
 226             projectionMatrix = masterProj * slave._projectionOffset;
 227
 228         if (!info->farCamera.valid()) {
 229             camera->setProjectionMatrix(projectionMatrix);
 230         } else {
 231             Camera* farCamera = info->farCamera.get();
 232             farCamera->setViewMatrix(viewMatrix);
 233             double left, right, bottom, top, parentNear, parentFar;
 234             projectionMatrix.getFrustum(left, right, bottom, top,
 235                                         parentNear, parentFar);
 236             if ((info->flags & FIXED_NEAR_FAR) == 0) {
 237                 parentNear = _zNear;
 238                 parentFar = _zFar;
 239             }
 240             if (parentFar < _nearField || _nearField == 0.0f) {
 241                 camera->setProjectionMatrix(projectionMatrix);
 242                 camera->setCullMask(camera->getCullMask()
 243                                     | simgear::BACKGROUND_BIT);
 244                 camera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
 245                 farCamera->setNodeMask(0);
 246             } else {
 247                 Matrix nearProj, farProj;
 248                 makeNewProjMat(projectionMatrix, parentNear, _nearField,
 249                                nearProj);
 250                 makeNewProjMat(projectionMatrix, _nearField, parentFar,
 251                                farProj);
 252                 camera->setProjectionMatrix(nearProj);
 253                 camera->setCullMask(camera->getCullMask()
 254                                     & ~simgear::BACKGROUND_BIT);
 255                 camera->setClearMask(GL_DEPTH_BUFFER_BIT);
 256                 farCamera->setProjectionMatrix(farProj);
 257                 farCamera->setNodeMask(camera->getNodeMask());
 258             }
 259         }
 260     }
 261 }
 262
 263 void CameraGroup::setCameraParameters(float vfov, float aspectRatio)
 264 {
 265     if (vfov != 0.0f && aspectRatio != 0.0f)
 266         _viewer->getCamera()
 267             ->setProjectionMatrixAsPerspective(vfov,
 268                                                1.0f / aspectRatio,
 269                                                _zNear, _zFar);
 270 }
 271
 272 double CameraGroup::getMasterAspectRatio() const
 273 {
 274     if (_cameras.empty())
 275         return 0.0;
 276
 277     const CameraInfo* info = _cameras.front();
 278
 279     const osg::Viewport* viewport = info->camera->getViewport();
 280     if (!viewport) {
 281         return 0.0;
 282     }
 283
 284     return static_cast<double>(viewport->height()) / viewport->width();
 285 }
 286
 287 }
 288
 289 namespace
 290 {
 291 // A raw value for property nodes that references a class member via
 292 // an osg::ref_ptr.
 293 template<class C, class T>
 294 class RefMember : public SGRawValue<T>
 295 {
 296 public:
 297     RefMember (C *obj, T C::*ptr)
 298         : _obj(obj), _ptr(ptr) {}
 299     virtual ~RefMember () {}
 300     virtual T getValue () const
 301     {
 302         return _obj.get()->*_ptr;
 303     }
 304     virtual bool setValue (T value)
 305     {
 306         _obj.get()->*_ptr = value;
 307         return true;
 308     }
 309     virtual SGRawValue<T> * clone () const
 310     {
 311         return new RefMember(_obj.get(), _ptr);
 312     }
 313 private:
 314     ref_ptr<C> _obj;
 315     T C::* const _ptr;
 316 };
 317
 318 template<typename C, typename T>
 319 RefMember<C, T> makeRefMember(C *obj, T C::*ptr)
 320 {
 321     return RefMember<C, T>(obj, ptr);
 322 }
 323
 324 template<typename C, typename T>
 325 void bindMemberToNode(SGPropertyNode* parent, const char* childName,
 326                       C* obj, T C::*ptr, T value)
 327 {
 328     SGPropertyNode* valNode = parent->getNode(childName);
 329     RefMember<C, T> refMember = makeRefMember(obj, ptr);
 330     if (!valNode) {
 331         valNode = parent->getNode(childName, true);
 332         valNode->tie(refMember, false);
 333         setValue(valNode, value);
 334     } else {
 335         valNode->tie(refMember, true);
 336     }
 337 }
 338
 339 void buildViewport(flightgear::CameraInfo* info, SGPropertyNode* viewportNode,
 340                    const osg::GraphicsContext::Traits *traits)
 341 {
 342     using namespace flightgear;
 343     bindMemberToNode(viewportNode, "x", info, &CameraInfo::x, 0.0);
 344     bindMemberToNode(viewportNode, "y", info, &CameraInfo::y, 0.0);
 345     bindMemberToNode(viewportNode, "width", info, &CameraInfo::width,
 346                      static_cast<double>(traits->width));
 347     bindMemberToNode(viewportNode, "height", info, &CameraInfo::height,
 348                      static_cast<double>(traits->height));
 349 }
 350 }
 351
 352 namespace flightgear
 353 {
 354
 355 // Mostly copied from osg's osgViewer/View.cpp
 356
 357 static osg::Geometry* createParoramicSphericalDisplayDistortionMesh(
 358     const Vec3& origin, const Vec3& widthVector, const Vec3& heightVector,
 359     double sphere_radius, double collar_radius,
 360     Image* intensityMap = 0, const Matrix& projectorMatrix = Matrix())
 361 {
 362     osg::Vec3d center(0.0,0.0,0.0);
 363     osg::Vec3d eye(0.0,0.0,0.0);
 364
 365     double distance = sqrt(sphere_radius*sphere_radius - collar_radius*collar_radius);
 366     bool flip = false;
 367     bool texcoord_flip = false;
 368
 369     osg::Vec3d projector = eye - osg::Vec3d(0.0,0.0, distance);
 370
 371 #if 0
 372     OSG_INFO<<"createParoramicSphericalDisplayDistortionMesh : Projector position = "<<projector<<std::endl;
 373     OSG_INFO<<"createParoramicSphericalDisplayDistortionMesh : distance = "<<distance<<std::endl;
 374 #endif
 375     // create the quad to visualize.
 376     osg::Geometry* geometry = new osg::Geometry();
 377
 378     geometry->setSupportsDisplayList(false);
 379
 380     osg::Vec3 xAxis(widthVector);
 381     float width = widthVector.length();
 382     xAxis /= width;
 383
 384     osg::Vec3 yAxis(heightVector);
 385     float height = heightVector.length();
 386     yAxis /= height;
 387
 388     int noSteps = 160;
 389
 390     osg::Vec3Array* vertices = new osg::Vec3Array;
 391     osg::Vec2Array* texcoords0 = new osg::Vec2Array;
 392     osg::Vec2Array* texcoords1 = intensityMap==0 ? new osg::Vec2Array : 0;
 393     osg::Vec4Array* colors = new osg::Vec4Array;
 394
 395     osg::Vec3 bottom = origin;
 396     osg::Vec3 dx = xAxis*(width/((float)(noSteps-2)));
 397     osg::Vec3 dy = yAxis*(height/((float)(noSteps-1)));
 398
 399     osg::Vec3 top = origin + yAxis*height;
 400
 401     osg::Vec3 screenCenter = origin + widthVector*0.5f + heightVector*0.5f;
 402     float screenRadius = heightVector.length() * 0.5f;
 403
 404     geometry->getOrCreateStateSet()->setMode(GL_CULL_FACE, osg::StateAttribute::OFF | osg::StateAttribute::PROTECTED);
 405
 406     for(int i=0;i<noSteps;++i)
 407     {
 408         osg::Vec3 cursor = bottom+dy*(float)i;
 409         for(int j=0;j<noSteps;++j)
 410         {
 411             osg::Vec2 texcoord(double(i)/double(noSteps-1), double(j)/double(noSteps-1));
 412             double theta = texcoord.x() * 2.0 * osg::PI;
 413             double phi = (1.0-texcoord.y()) * osg::PI;
 414
 415             if (texcoord_flip) texcoord.y() = 1.0f - texcoord.y();
 416
 417             osg::Vec3 pos(sin(phi)*sin(theta), sin(phi)*cos(theta), cos(phi));
 418             pos = pos*projectorMatrix;
 419
 420             double alpha = atan2(pos.x(), pos.y());
 421             if (alpha<0.0) alpha += 2.0*osg::PI;
 422
 423             double beta = atan2(sqrt(pos.x()*pos.x() + pos.y()*pos.y()), pos.z());
 424             if (beta<0.0) beta += 2.0*osg::PI;
 425
 426             double gamma = atan2(sqrt(double(pos.x()*pos.x() + pos.y()*pos.y())), double(pos.z()+distance));
 427             if (gamma<0.0) gamma += 2.0*osg::PI;
 428
 429
 430             osg::Vec3 v = screenCenter + osg::Vec3(sin(alpha)*gamma*2.0/osg::PI, -cos(alpha)*gamma*2.0/osg::PI, 0.0f)*screenRadius;
 431
 432             if (flip)
 433                 vertices->push_back(osg::Vec3(v.x(), top.y()-(v.y()-origin.y()),v.z()));
 434             else
 435                 vertices->push_back(v);
 436
 437             texcoords0->push_back( texcoord );
 438
 439             osg::Vec2 texcoord1(alpha/(2.0*osg::PI), 1.0f - beta/osg::PI);
 440             if (intensityMap)
 441             {
 442                 colors->push_back(intensityMap->getColor(texcoord1));
 443             }
 444             else
 445             {
 446                 colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
 447                 if (texcoords1) texcoords1->push_back( texcoord1 );
 448             }
 449
 450
 451         }
 452     }
 453
 454
 455     // pass the created vertex array to the points geometry object.
 456     geometry->setVertexArray(vertices);
 457
 458     geometry->setColorArray(colors);
 459     geometry->setColorBinding(osg::Geometry::BIND_PER_VERTEX);
 460
 461     geometry->setTexCoordArray(0,texcoords0);
 462     if (texcoords1) geometry->setTexCoordArray(1,texcoords1);
 463
 464     osg::DrawElementsUShort* elements = new osg::DrawElementsUShort(osg::PrimitiveSet::TRIANGLES);
 465     geometry->addPrimitiveSet(elements);
 466
 467     for(int i=0;i<noSteps-1;++i)
 468     {
 469         for(int j=0;j<noSteps-1;++j)
 470         {
 471             int i1 = j+(i+1)*noSteps;
 472             int i2 = j+(i)*noSteps;
 473             int i3 = j+1+(i)*noSteps;
 474             int i4 = j+1+(i+1)*noSteps;
 475
 476             osg::Vec3& v1 = (*vertices)[i1];
 477             osg::Vec3& v2 = (*vertices)[i2];
 478             osg::Vec3& v3 = (*vertices)[i3];
 479             osg::Vec3& v4 = (*vertices)[i4];
 480
 481             if ((v1-screenCenter).length()>screenRadius) continue;
 482             if ((v2-screenCenter).length()>screenRadius) continue;
 483             if ((v3-screenCenter).length()>screenRadius) continue;
 484             if ((v4-screenCenter).length()>screenRadius) continue;
 485
 486             elements->push_back(i1);
 487             elements->push_back(i2);
 488             elements->push_back(i3);
 489
 490             elements->push_back(i1);
 491             elements->push_back(i3);
 492             elements->push_back(i4);
 493         }
 494     }
 495
 496     return geometry;
 497 }
 498
 499 void CameraGroup::buildDistortionCamera(const SGPropertyNode* psNode,
 500                                         Camera* camera)
 501 {
 502     const SGPropertyNode* texNode = psNode->getNode("texture");
 503     if (!texNode) {
 504         // error
 505         return;
 506     }
 507     string texName = texNode->getStringValue();
 508     TextureMap::iterator itr = _textureTargets.find(texName);
 509     if (itr == _textureTargets.end()) {
 510         // error
 511         return;
 512     }
 513     Viewport* viewport = camera->getViewport();
 514     float width = viewport->width();
 515     float height = viewport->height();
 516     TextureRectangle* texRect = itr->second.get();
 517     double radius = psNode->getDoubleValue("radius", 1.0);
 518     double collar = psNode->getDoubleValue("collar", 0.45);
 519     Geode* geode = new Geode();
 520     geode->addDrawable(createParoramicSphericalDisplayDistortionMesh(
 521                            Vec3(0.0f,0.0f,0.0f), Vec3(width,0.0f,0.0f),
 522                            Vec3(0.0f,height,0.0f), radius, collar));
 523
 524     // new we need to add the texture to the mesh, we do so by creating a
 525     // StateSet to contain the Texture StateAttribute.
 526     StateSet* stateset = geode->getOrCreateStateSet();
 527     stateset->setTextureAttributeAndModes(0, texRect, StateAttribute::ON);
 528     stateset->setMode(GL_LIGHTING, StateAttribute::OFF);
 529
 530     TexMat* texmat = new TexMat;
 531     texmat->setScaleByTextureRectangleSize(true);
 532     stateset->setTextureAttributeAndModes(0, texmat, osg::StateAttribute::ON);
 533 #if 0
 534     if (!applyIntensityMapAsColours && intensityMap)
 535     {
 536         stateset->setTextureAttributeAndModes(1, new osg::Texture2D(intensityMap), osg::StateAttribute::ON);
 537     }
 538 #endif
 539     // add subgraph to render
 540     camera->addChild(geode);
 541     camera->setClearMask(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
 542     camera->setClearColor(osg::Vec4(0.0, 0.0, 0.0, 1.0));
 543     camera->setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR);
 544     camera->setCullingMode(osg::CullSettings::NO_CULLING);
 545     camera->setName("DistortionCorrectionCamera");
 546 }
 547
 548 CameraInfo* CameraGroup::buildCamera(SGPropertyNode* cameraNode)
 549 {
 550     WindowBuilder *wBuild = WindowBuilder::getWindowBuilder();
 551     const SGPropertyNode* windowNode = cameraNode->getNode("window");
 552     GraphicsWindow* window = 0;
 553     int cameraFlags = DO_INTERSECTION_TEST;
 554     if (windowNode) {
 555         // New style window declaration / definition
 556         window = wBuild->buildWindow(windowNode);
 557     } else {
 558         // Old style: suck window params out of camera block
 559         window = wBuild->buildWindow(cameraNode);
 560     }
 561     if (!window) {
 562         return 0;
 563     }
 564     Camera* camera = new Camera;
 565     camera->setAllowEventFocus(false);
 566     camera->setGraphicsContext(window->gc.get());
 567     camera->setViewport(new Viewport);
 568     camera->setCullingMode(CullSettings::SMALL_FEATURE_CULLING
 569                            | CullSettings::VIEW_FRUSTUM_CULLING);
 570     camera->setInheritanceMask(CullSettings::ALL_VARIABLES
 571                                & ~(CullSettings::CULL_MASK
 572                                    | CullSettings::CULLING_MODE
 573 #if defined(HAVE_CULLSETTINGS_CLEAR_MASK)
 574                                    | CullSettings::CLEAR_MASK
 575 #endif
 576                                    ));
 577
 578     osg::Matrix pOff;
 579     osg::Matrix vOff;
 580     const SGPropertyNode* viewNode = cameraNode->getNode("view");
 581     if (viewNode) {
 582         double heading = viewNode->getDoubleValue("heading-deg", 0.0);
 583         double pitch = viewNode->getDoubleValue("pitch-deg", 0.0);
 584         double roll = viewNode->getDoubleValue("roll-deg", 0.0);
 585         double x = viewNode->getDoubleValue("x", 0.0);
 586         double y = viewNode->getDoubleValue("y", 0.0);
 587         double z = viewNode->getDoubleValue("z", 0.0);
 588         // Build a view matrix, which is the inverse of a model
 589         // orientation matrix.
 590         vOff = (Matrix::translate(-x, -y, -z)
 591                 * Matrix::rotate(-DegreesToRadians(heading),
 592                                  Vec3d(0.0, 1.0, 0.0),
 593                                  -DegreesToRadians(pitch),
 594                                  Vec3d(1.0, 0.0, 0.0),
 595                                  -DegreesToRadians(roll),
 596                                  Vec3d(0.0, 0.0, 1.0)));
 597         if (viewNode->getBoolValue("absolute", false))
 598             cameraFlags |= VIEW_ABSOLUTE;
 599     } else {
 600         // Old heading parameter, works in the opposite direction
 601         double heading = cameraNode->getDoubleValue("heading-deg", 0.0);
 602         vOff.makeRotate(DegreesToRadians(heading), osg::Vec3(0, 1, 0));
 603     }
 604     const SGPropertyNode* projectionNode = 0;
 605     if ((projectionNode = cameraNode->getNode("perspective")) != 0) {
 606         double fovy = projectionNode->getDoubleValue("fovy-deg", 55.0);
 607         double aspectRatio = projectionNode->getDoubleValue("aspect-ratio",
 608                                                             1.0);
 609         double zNear = projectionNode->getDoubleValue("near", 0.0);
 610         double zFar = projectionNode->getDoubleValue("far", zNear + 20000);
 611         double offsetX = projectionNode->getDoubleValue("offset-x", 0.0);
 612         double offsetY = projectionNode->getDoubleValue("offset-y", 0.0);
 613         double tan_fovy = tan(DegreesToRadians(fovy*0.5));
 614         double right = tan_fovy * aspectRatio * zNear + offsetX;
 615         double left = -tan_fovy * aspectRatio * zNear + offsetX;
 616         double top = tan_fovy * zNear + offsetY;
 617         double bottom = -tan_fovy * zNear + offsetY;
 618         pOff.makeFrustum(left, right, bottom, top, zNear, zFar);
 619         cameraFlags |= PROJECTION_ABSOLUTE;
 620         if (projectionNode->getBoolValue("fixed-near-far", true))
 621             cameraFlags |= FIXED_NEAR_FAR;
 622     } else if ((projectionNode = cameraNode->getNode("frustum")) != 0
 623                || (projectionNode = cameraNode->getNode("ortho")) != 0) {
 624         double top = projectionNode->getDoubleValue("top", 0.0);
 625         double bottom = projectionNode->getDoubleValue("bottom", 0.0);
 626         double left = projectionNode->getDoubleValue("left", 0.0);
 627         double right = projectionNode->getDoubleValue("right", 0.0);
 628         double zNear = projectionNode->getDoubleValue("near", 0.0);
 629         double zFar = projectionNode->getDoubleValue("far", zNear + 20000);
 630         if (cameraNode->getNode("frustum")) {
 631             pOff.makeFrustum(left, right, bottom, top, zNear, zFar);
 632             cameraFlags |= PROJECTION_ABSOLUTE;
 633         } else {
 634             pOff.makeOrtho(left, right, bottom, top, zNear, zFar);
 635             cameraFlags |= (PROJECTION_ABSOLUTE | ORTHO);
 636         }
 637         if (projectionNode->getBoolValue("fixed-near-far", true))
 638             cameraFlags |= FIXED_NEAR_FAR;
 639     } else {
 640         // old style shear parameters
 641         double shearx = cameraNode->getDoubleValue("shear-x", 0);
 642         double sheary = cameraNode->getDoubleValue("shear-y", 0);
 643         pOff.makeTranslate(-shearx, -sheary, 0);
 644     }
 645     const SGPropertyNode* textureNode = cameraNode->getNode("texture");
 646     if (textureNode) {
 647         string texName = textureNode->getStringValue("name");
 648         int tex_width = textureNode->getIntValue("width");
 649         int tex_height = textureNode->getIntValue("height");
 650         TextureRectangle* texture = new TextureRectangle;
 651
 652         texture->setTextureSize(tex_width, tex_height);
 653         texture->setInternalFormat(GL_RGB);
 654         texture->setFilter(Texture::MIN_FILTER, Texture::LINEAR);
 655         texture->setFilter(Texture::MAG_FILTER, Texture::LINEAR);
 656         texture->setWrap(Texture::WRAP_S, Texture::CLAMP_TO_EDGE);
 657         texture->setWrap(Texture::WRAP_T, Texture::CLAMP_TO_EDGE);
 658         camera->setDrawBuffer(GL_FRONT);
 659         camera->setReadBuffer(GL_FRONT);
 660         camera->setRenderTargetImplementation(Camera::FRAME_BUFFER_OBJECT);
 661         camera->attach(Camera::COLOR_BUFFER, texture);
 662         _textureTargets[texName] = texture;
 663     } else {
 664         camera->setDrawBuffer(GL_BACK);
 665         camera->setReadBuffer(GL_BACK);
 666     }
 667     const SGPropertyNode* psNode = cameraNode->getNode("panoramic-spherical");
 668     bool useMasterSceneGraph = !psNode;
 669     CameraInfo* info = addCamera(cameraFlags, camera, vOff, pOff,
 670                                  useMasterSceneGraph);
 671     // If a viewport isn't set on the camera, then it's hard to dig it
 672     // out of the SceneView objects in the viewer, and the coordinates
 673     // of mouse events are somewhat bizzare.
 674     SGPropertyNode* viewportNode = cameraNode->getNode("viewport", true);
 675     buildViewport(info, viewportNode, window->gc->getTraits());
 676     updateCameras(info);
 677     // Distortion camera needs the viewport which is created by addCamera().
 678     if (psNode) {
 679         info->flags = info->flags | VIEW_ABSOLUTE;
 680         buildDistortionCamera(psNode, camera);
 681     }
 682     return info;
 683 }
 684
 685 CameraInfo* CameraGroup::buildGUICamera(SGPropertyNode* cameraNode,
 686                                         GraphicsWindow* window)
 687 {
 688     WindowBuilder *wBuild = WindowBuilder::getWindowBuilder();
 689     const SGPropertyNode* windowNode = (cameraNode
 690                                         ? cameraNode->getNode("window")
 691                                         : 0);
 692     if (!window && windowNode) {
 693       // New style window declaration / definition
 694       window = wBuild->buildWindow(windowNode);
 695     }
 696
 697     if (!window) { // buildWindow can fail
 698       SG_LOG(SG_GENERAL, SG_WARN, "CameraGroup::buildGUICamera: failed to build a window");
 699       return NULL;
 700     }
 701
 702     Camera* camera = new Camera;
 703     camera->setAllowEventFocus(false);
 704     camera->setGraphicsContext(window->gc.get());
 705     camera->setViewport(new Viewport);
 706     // XXX Camera needs to be drawn last; eventually the render order
 707     // should be assigned by a camera manager.
 708     camera->setRenderOrder(osg::Camera::POST_RENDER, 100);
 709         camera->setClearMask(0);
 710     camera->setInheritanceMask(CullSettings::ALL_VARIABLES
 711                                & ~(CullSettings::COMPUTE_NEAR_FAR_MODE
 712                                    | CullSettings::CULLING_MODE
 713 #if defined(HAVE_CULLSETTINGS_CLEAR_MASK)
 714                                    | CullSettings::CLEAR_MASK
 715 #endif
 716                                    ));
 717     camera->setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR);
 718     camera->setCullingMode(osg::CullSettings::NO_CULLING);
 719     camera->setProjectionResizePolicy(Camera::FIXED);
 720     camera->setReferenceFrame(Transform::ABSOLUTE_RF);
 721     const int cameraFlags = GUI;
 722     CameraInfo* result = addCamera(cameraFlags, camera, Matrixd::identity(),
 723                                    Matrixd::identity(), false);
 724     SGPropertyNode* viewportNode = cameraNode->getNode("viewport", true);
 725     buildViewport(result, viewportNode, window->gc->getTraits());
 726
 727     // Disable statistics for the GUI camera.
 728     result->camera->setStats(0);
 729     updateCameras(result);
 730     return result;
 731 }
 732
 733 CameraGroup* CameraGroup::buildCameraGroup(osgViewer::Viewer* viewer,
 734                                            SGPropertyNode* gnode)
 735 {
 736     CameraGroup* cgroup = new CameraGroup(viewer);
 737     for (int i = 0; i < gnode->nChildren(); ++i) {
 738         SGPropertyNode* pNode = gnode->getChild(i);
 739         const char* name = pNode->getName();
 740         if (!strcmp(name, "camera")) {
 741             cgroup->buildCamera(pNode);
 742         } else if (!strcmp(name, "window")) {
 743             WindowBuilder::getWindowBuilder()->buildWindow(pNode);
 744         } else if (!strcmp(name, "gui")) {
 745             cgroup->buildGUICamera(pNode);
 746         }
 747     }
 748     bindMemberToNode(gnode, "znear", cgroup, &CameraGroup::_zNear, .1f);
 749     bindMemberToNode(gnode, "zfar", cgroup, &CameraGroup::_zFar, 120000.0f);
 750     bindMemberToNode(gnode, "near-field", cgroup, &CameraGroup::_nearField,
 751                      100.0f);
 752     return cgroup;
 753 }
 754
 755 void CameraGroup::setCameraCullMasks(Node::NodeMask nm)
 756 {
 757     for (CameraIterator i = camerasBegin(), e = camerasEnd(); i != e; ++i) {
 758         CameraInfo* info = i->get();
 759         if (info->flags & GUI)
 760             continue;
 761         if (info->farCamera.valid() && info->farCamera->getNodeMask() != 0) {
 762             info->camera->setCullMask(nm & ~simgear::BACKGROUND_BIT);
 763             info->camera->setCullMaskLeft(nm & ~simgear::BACKGROUND_BIT);
 764             info->camera->setCullMaskRight(nm & ~simgear::BACKGROUND_BIT);
 765             info->farCamera->setCullMask(nm);
 766             info->farCamera->setCullMaskLeft(nm);
 767             info->farCamera->setCullMaskRight(nm);
 768         } else {
 769             info->camera->setCullMask(nm);
 770             info->camera->setCullMaskLeft(nm);
 771             info->camera->setCullMaskRight(nm);
 772         }
 773     }
 774 }
 775
 776 void CameraGroup::resized()
 777 {
 778     for (CameraIterator i = camerasBegin(), e = camerasEnd(); i != e; ++i) {
 779         CameraInfo *info = i->get();
 780         const Viewport* viewport = info->camera->getViewport();
 781         info->x = viewport->x();
 782         info->y = viewport->y();
 783         info->width = viewport->width();
 784         info->height = viewport->height();
 785     }
 786 }
 787
 788 Camera* getGUICamera(CameraGroup* cgroup)
 789 {
 790     CameraGroup::CameraIterator end = cgroup->camerasEnd();
 791     CameraGroup::CameraIterator result
 792         = std::find_if(cgroup->camerasBegin(), end,
 793                        FlagTester<CameraInfo>(CameraGroup::GUI));
 794     if (result != end)
 795         return (*result)->camera.get();
 796     else
 797         return 0;
 798 }
 799
 800 bool computeIntersections(const CameraGroup* cgroup,
 801                           const osgGA::GUIEventAdapter* ea,
 802                           osgUtil::LineSegmentIntersector::Intersections& intersections)
 803 {
 804     using osgUtil::Intersector;
 805     using osgUtil::LineSegmentIntersector;
 806     double x, y;
 807     eventToWindowCoords(ea, x, y);
 808     // Find camera that contains event
 809     for (CameraGroup::ConstCameraIterator iter = cgroup->camerasBegin(),
 810              e = cgroup->camerasEnd();
 811          iter != e;
 812          ++iter) {
 813         const CameraInfo* cinfo = iter->get();
 814         if ((cinfo->flags & CameraGroup::DO_INTERSECTION_TEST) == 0)
 815             continue;
 816         const Camera* camera = cinfo->camera.get();
 817         if (camera->getGraphicsContext() != ea->getGraphicsContext())
 818             continue;
 819         const Viewport* viewport = camera->getViewport();
 820         double epsilon = 0.5;
 821         if (!(x >= viewport->x() - epsilon
 822               && x < viewport->x() + viewport->width() -1.0 + epsilon
 823               && y >= viewport->y() - epsilon
 824               && y < viewport->y() + viewport->height() -1.0 + epsilon))
 825             continue;
 826         Vec4d start(x, y, 0.0, 1.0);
 827         Vec4d end(x, y, 1.0, 1.0);
 828         Matrix windowMat = viewport->computeWindowMatrix();
 829         Matrix startPtMat = Matrix::inverse(camera->getProjectionMatrix()
 830                                             * windowMat);
 831         Matrix endPtMat;
 832         if (!cinfo->farCamera.valid() || cinfo->farCamera->getNodeMask() == 0)
 833             endPtMat = startPtMat;
 834         else
 835             endPtMat = Matrix::inverse(cinfo->farCamera->getProjectionMatrix()
 836                                        * windowMat);
 837         start = start * startPtMat;
 838         start /= start.w();
 839         end = end * endPtMat;
 840         end /= end.w();
 841         ref_ptr<LineSegmentIntersector> picker
 842             = new LineSegmentIntersector(Intersector::VIEW,
 843                                          Vec3d(start.x(), start.y(), start.z()),
 844                                          Vec3d(end.x(), end.y(), end.z()));
 845         osgUtil::IntersectionVisitor iv(picker.get());
 846         const_cast<Camera*>(camera)->accept(iv);
 847         if (picker->containsIntersections()) {
 848             intersections = picker->getIntersections();
 849             return true;
 850         } else {
 851             break;
 852         }
 853     }
 854     intersections.clear();
 855     return false;
 856 }
 857
 858 void warpGUIPointer(CameraGroup* cgroup, int x, int y)
 859 {
 860     using osgViewer::GraphicsWindow;
 861     Camera* guiCamera = getGUICamera(cgroup);
 862     if (!guiCamera)
 863         return;
 864     Viewport* vport = guiCamera->getViewport();
 865     GraphicsWindow* gw
 866         = dynamic_cast<GraphicsWindow*>(guiCamera->getGraphicsContext());
 867     if (!gw)
 868         return;
 869     globals->get_renderer()->getEventHandler()->setMouseWarped();
 870     // Translate the warp request into the viewport of the GUI camera,
 871     // send the request to the window, then transform the coordinates
 872     // for the Viewer's event queue.
 873     double wx = x + vport->x();
 874     double wyUp = vport->height() + vport->y() - y;
 875     double wy;
 876     const GraphicsContext::Traits* traits = gw->getTraits();
 877     if (gw->getEventQueue()->getCurrentEventState()->getMouseYOrientation()
 878         == osgGA::GUIEventAdapter::Y_INCREASING_DOWNWARDS) {
 879         wy = traits->height - wyUp;
 880     } else {
 881         wy = wyUp;
 882     }
 883     gw->getEventQueue()->mouseWarped(wx, wy);
 884     gw->requestWarpPointer(wx, wy);
 885     osgGA::GUIEventAdapter* eventState
 886         = cgroup->getViewer()->getEventQueue()->getCurrentEventState();
 887     double viewerX
 888         = (eventState->getXmin()
 889            + ((wx / double(traits->width))
 890               * (eventState->getXmax() - eventState->getXmin())));
 891     double viewerY
 892         = (eventState->getYmin()
 893            + ((wyUp / double(traits->height))
 894               * (eventState->getYmax() - eventState->getYmin())));
 895     cgroup->getViewer()->getEventQueue()->mouseWarped(viewerX, viewerY);
 896 }
 897 }