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