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