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