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 double CameraGroup::getMasterAspectRatio() const
 268 {
 269     if (_cameras.empty())
 270         return 0.0;
 271
 272     const CameraInfo* info = _cameras.front();
 273
 274     const osg::Viewport* viewport = info->camera->getViewport();
 275     if (!viewport) {
 276         return 0.0;
 277     }
 278
 279     return static_cast<double>(viewport->height()) / viewport->width();
 280 }
 281
 282 }
 283
 284 namespace
 285 {
 286 // A raw value for property nodes that references a class member via
 287 // an osg::ref_ptr.
 288 template<class C, class T>
 289 class RefMember : public SGRawValue<T>
 290 {
 291 public:
 292     RefMember (C *obj, T C::*ptr)
 293         : _obj(obj), _ptr(ptr) {}
 294     virtual ~RefMember () {}
 295     virtual T getValue () const
 296     {
 297         return _obj.get()->*_ptr;
 298     }
 299     virtual bool setValue (T value)
 300     {
 301         _obj.get()->*_ptr = value;
 302         return true;
 303     }
 304     virtual SGRawValue<T> * clone () const
 305     {
 306         return new RefMember(_obj.get(), _ptr);
 307     }
 308 private:
 309     ref_ptr<C> _obj;
 310     T C::* const _ptr;
 311 };
 312
 313 template<typename C, typename T>
 314 RefMember<C, T> makeRefMember(C *obj, T C::*ptr)
 315 {
 316     return RefMember<C, T>(obj, ptr);
 317 }
 318
 319 template<typename C, typename T>
 320 void bindMemberToNode(SGPropertyNode* parent, const char* childName,
 321                       C* obj, T C::*ptr, T value)
 322 {
 323     SGPropertyNode* valNode = parent->getNode(childName);
 324     RefMember<C, T> refMember = makeRefMember(obj, ptr);
 325     if (!valNode) {
 326         valNode = parent->getNode(childName, true);
 327         valNode->tie(refMember, false);
 328         setValue(valNode, value);
 329     } else {
 330         valNode->tie(refMember, true);
 331     }
 332 }
 333
 334 void buildViewport(flightgear::CameraInfo* info, SGPropertyNode* viewportNode,
 335                    const osg::GraphicsContext::Traits *traits)
 336 {
 337     using namespace flightgear;
 338     bindMemberToNode(viewportNode, "x", info, &CameraInfo::x, 0.0);
 339     bindMemberToNode(viewportNode, "y", info, &CameraInfo::y, 0.0);
 340     bindMemberToNode(viewportNode, "width", info, &CameraInfo::width,
 341                      static_cast<double>(traits->width));
 342     bindMemberToNode(viewportNode, "height", info, &CameraInfo::height,
 343                      static_cast<double>(traits->height));
 344 }
 345 }
 346
 347 namespace flightgear
 348 {
 349
 350 // Mostly copied from osg's osgViewer/View.cpp
 351
 352 static osg::Geometry* createParoramicSphericalDisplayDistortionMesh(
 353     const Vec3& origin, const Vec3& widthVector, const Vec3& heightVector,
 354     double sphere_radius, double collar_radius,
 355     Image* intensityMap = 0, const Matrix& projectorMatrix = Matrix())
 356 {
 357     osg::Vec3d center(0.0,0.0,0.0);
 358     osg::Vec3d eye(0.0,0.0,0.0);
 359
 360     double distance = sqrt(sphere_radius*sphere_radius - collar_radius*collar_radius);
 361     bool flip = false;
 362     bool texcoord_flip = false;
 363
 364     osg::Vec3d projector = eye - osg::Vec3d(0.0,0.0, distance);
 365
 366 #if 0
 367     OSG_INFO<<"createParoramicSphericalDisplayDistortionMesh : Projector position = "<<projector<<std::endl;
 368     OSG_INFO<<"createParoramicSphericalDisplayDistortionMesh : distance = "<<distance<<std::endl;
 369 #endif
 370     // create the quad to visualize.
 371     osg::Geometry* geometry = new osg::Geometry();
 372
 373     geometry->setSupportsDisplayList(false);
 374
 375     osg::Vec3 xAxis(widthVector);
 376     float width = widthVector.length();
 377     xAxis /= width;
 378
 379     osg::Vec3 yAxis(heightVector);
 380     float height = heightVector.length();
 381     yAxis /= height;
 382
 383     int noSteps = 160;
 384
 385     osg::Vec3Array* vertices = new osg::Vec3Array;
 386     osg::Vec2Array* texcoords0 = new osg::Vec2Array;
 387     osg::Vec2Array* texcoords1 = intensityMap==0 ? new osg::Vec2Array : 0;
 388     osg::Vec4Array* colors = new osg::Vec4Array;
 389
 390     osg::Vec3 bottom = origin;
 391     osg::Vec3 dx = xAxis*(width/((float)(noSteps-2)));
 392     osg::Vec3 dy = yAxis*(height/((float)(noSteps-1)));
 393
 394     osg::Vec3 top = origin + yAxis*height;
 395
 396     osg::Vec3 screenCenter = origin + widthVector*0.5f + heightVector*0.5f;
 397     float screenRadius = heightVector.length() * 0.5f;
 398
 399     geometry->getOrCreateStateSet()->setMode(GL_CULL_FACE, osg::StateAttribute::OFF | osg::StateAttribute::PROTECTED);
 400
 401     for(int i=0;i<noSteps;++i)
 402     {
 403         osg::Vec3 cursor = bottom+dy*(float)i;
 404         for(int j=0;j<noSteps;++j)
 405         {
 406             osg::Vec2 texcoord(double(i)/double(noSteps-1), double(j)/double(noSteps-1));
 407             double theta = texcoord.x() * 2.0 * osg::PI;
 408             double phi = (1.0-texcoord.y()) * osg::PI;
 409
 410             if (texcoord_flip) texcoord.y() = 1.0f - texcoord.y();
 411
 412             osg::Vec3 pos(sin(phi)*sin(theta), sin(phi)*cos(theta), cos(phi));
 413             pos = pos*projectorMatrix;
 414
 415             double alpha = atan2(pos.x(), pos.y());
 416             if (alpha<0.0) alpha += 2.0*osg::PI;
 417
 418             double beta = atan2(sqrt(pos.x()*pos.x() + pos.y()*pos.y()), pos.z());
 419             if (beta<0.0) beta += 2.0*osg::PI;
 420
 421             double gamma = atan2(sqrt(double(pos.x()*pos.x() + pos.y()*pos.y())), double(pos.z()+distance));
 422             if (gamma<0.0) gamma += 2.0*osg::PI;
 423
 424
 425             osg::Vec3 v = screenCenter + osg::Vec3(sin(alpha)*gamma*2.0/osg::PI, -cos(alpha)*gamma*2.0/osg::PI, 0.0f)*screenRadius;
 426
 427             if (flip)
 428                 vertices->push_back(osg::Vec3(v.x(), top.y()-(v.y()-origin.y()),v.z()));
 429             else
 430                 vertices->push_back(v);
 431
 432             texcoords0->push_back( texcoord );
 433
 434             osg::Vec2 texcoord1(alpha/(2.0*osg::PI), 1.0f - beta/osg::PI);
 435             if (intensityMap)
 436             {
 437                 colors->push_back(intensityMap->getColor(texcoord1));
 438             }
 439             else
 440             {
 441                 colors->push_back(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
 442                 if (texcoords1) texcoords1->push_back( texcoord1 );
 443             }
 444
 445
 446         }
 447     }
 448
 449
 450     // pass the created vertex array to the points geometry object.
 451     geometry->setVertexArray(vertices);
 452
 453     geometry->setColorArray(colors);
 454     geometry->setColorBinding(osg::Geometry::BIND_PER_VERTEX);
 455
 456     geometry->setTexCoordArray(0,texcoords0);
 457     if (texcoords1) geometry->setTexCoordArray(1,texcoords1);
 458
 459     osg::DrawElementsUShort* elements = new osg::DrawElementsUShort(osg::PrimitiveSet::TRIANGLES);
 460     geometry->addPrimitiveSet(elements);
 461
 462     for(int i=0;i<noSteps-1;++i)
 463     {
 464         for(int j=0;j<noSteps-1;++j)
 465         {
 466             int i1 = j+(i+1)*noSteps;
 467             int i2 = j+(i)*noSteps;
 468             int i3 = j+1+(i)*noSteps;
 469             int i4 = j+1+(i+1)*noSteps;
 470
 471             osg::Vec3& v1 = (*vertices)[i1];
 472             osg::Vec3& v2 = (*vertices)[i2];
 473             osg::Vec3& v3 = (*vertices)[i3];
 474             osg::Vec3& v4 = (*vertices)[i4];
 475
 476             if ((v1-screenCenter).length()>screenRadius) continue;
 477             if ((v2-screenCenter).length()>screenRadius) continue;
 478             if ((v3-screenCenter).length()>screenRadius) continue;
 479             if ((v4-screenCenter).length()>screenRadius) continue;
 480
 481             elements->push_back(i1);
 482             elements->push_back(i2);
 483             elements->push_back(i3);
 484
 485             elements->push_back(i1);
 486             elements->push_back(i3);
 487             elements->push_back(i4);
 488         }
 489     }
 490
 491     return geometry;
 492 }
 493
 494 void CameraGroup::buildDistortionCamera(const SGPropertyNode* psNode,
 495                                         Camera* camera)
 496 {
 497     const SGPropertyNode* texNode = psNode->getNode("texture");
 498     if (!texNode) {
 499         // error
 500         return;
 501     }
 502     string texName = texNode->getStringValue();
 503     TextureMap::iterator itr = _textureTargets.find(texName);
 504     if (itr == _textureTargets.end()) {
 505         // error
 506         return;
 507     }
 508     Viewport* viewport = camera->getViewport();
 509     float width = viewport->width();
 510     float height = viewport->height();
 511     TextureRectangle* texRect = itr->second.get();
 512     double radius = psNode->getDoubleValue("radius", 1.0);
 513     double collar = psNode->getDoubleValue("collar", 0.45);
 514     Geode* geode = new Geode();
 515     geode->addDrawable(createParoramicSphericalDisplayDistortionMesh(
 516                            Vec3(0.0f,0.0f,0.0f), Vec3(width,0.0f,0.0f),
 517                            Vec3(0.0f,height,0.0f), radius, collar));
 518
 519     // new we need to add the texture to the mesh, we do so by creating a
 520     // StateSet to contain the Texture StateAttribute.
 521     StateSet* stateset = geode->getOrCreateStateSet();
 522     stateset->setTextureAttributeAndModes(0, texRect, StateAttribute::ON);
 523     stateset->setMode(GL_LIGHTING, StateAttribute::OFF);
 524
 525     TexMat* texmat = new TexMat;
 526     texmat->setScaleByTextureRectangleSize(true);
 527     stateset->setTextureAttributeAndModes(0, texmat, osg::StateAttribute::ON);
 528 #if 0
 529     if (!applyIntensityMapAsColours && intensityMap)
 530     {
 531         stateset->setTextureAttributeAndModes(1, new osg::Texture2D(intensityMap), osg::StateAttribute::ON);
 532     }
 533 #endif
 534     // add subgraph to render
 535     camera->addChild(geode);
 536     camera->setClearMask(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
 537     camera->setClearColor(osg::Vec4(0.0, 0.0, 0.0, 1.0));
 538     camera->setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR);
 539     camera->setCullingMode(osg::CullSettings::NO_CULLING);
 540     camera->setName("DistortionCorrectionCamera");
 541 }
 542
 543 CameraInfo* CameraGroup::buildCamera(SGPropertyNode* cameraNode)
 544 {
 545     WindowBuilder *wBuild = WindowBuilder::getWindowBuilder();
 546     const SGPropertyNode* windowNode = cameraNode->getNode("window");
 547     GraphicsWindow* window = 0;
 548     int cameraFlags = DO_INTERSECTION_TEST;
 549     if (windowNode) {
 550         // New style window declaration / definition
 551         window = wBuild->buildWindow(windowNode);
 552     } else {
 553         // Old style: suck window params out of camera block
 554         window = wBuild->buildWindow(cameraNode);
 555     }
 556     if (!window) {
 557         return 0;
 558     }
 559     Camera* camera = new Camera;
 560     camera->setAllowEventFocus(false);
 561     camera->setGraphicsContext(window->gc.get());
 562     camera->setViewport(new Viewport);
 563     camera->setCullingMode(CullSettings::SMALL_FEATURE_CULLING
 564                            | CullSettings::VIEW_FRUSTUM_CULLING);
 565     camera->setInheritanceMask(CullSettings::ALL_VARIABLES
 566                                & ~(CullSettings::CULL_MASK
 567                                    | CullSettings::CULLING_MODE
 568 #if defined(HAVE_CULLSETTINGS_CLEAR_MASK)
 569                                    | CullSettings::CLEAR_MASK
 570 #endif
 571                                    ));
 572
 573     osg::Matrix pOff;
 574     osg::Matrix vOff;
 575     const SGPropertyNode* viewNode = cameraNode->getNode("view");
 576     if (viewNode) {
 577         double heading = viewNode->getDoubleValue("heading-deg", 0.0);
 578         double pitch = viewNode->getDoubleValue("pitch-deg", 0.0);
 579         double roll = viewNode->getDoubleValue("roll-deg", 0.0);
 580         double x = viewNode->getDoubleValue("x", 0.0);
 581         double y = viewNode->getDoubleValue("y", 0.0);
 582         double z = viewNode->getDoubleValue("z", 0.0);
 583         // Build a view matrix, which is the inverse of a model
 584         // orientation matrix.
 585         vOff = (Matrix::translate(-x, -y, -z)
 586                 * Matrix::rotate(-DegreesToRadians(heading),
 587                                  Vec3d(0.0, 1.0, 0.0),
 588                                  -DegreesToRadians(pitch),
 589                                  Vec3d(1.0, 0.0, 0.0),
 590                                  -DegreesToRadians(roll),
 591                                  Vec3d(0.0, 0.0, 1.0)));
 592         if (viewNode->getBoolValue("absolute", false))
 593             cameraFlags |= VIEW_ABSOLUTE;
 594     } else {
 595         // Old heading parameter, works in the opposite direction
 596         double heading = cameraNode->getDoubleValue("heading-deg", 0.0);
 597         vOff.makeRotate(DegreesToRadians(heading), osg::Vec3(0, 1, 0));
 598     }
 599     const SGPropertyNode* projectionNode = 0;
 600     if ((projectionNode = cameraNode->getNode("perspective")) != 0) {
 601         double fovy = projectionNode->getDoubleValue("fovy-deg", 55.0);
 602         double aspectRatio = projectionNode->getDoubleValue("aspect-ratio",
 603                                                             1.0);
 604         double zNear = projectionNode->getDoubleValue("near", 0.0);
 605         double zFar = projectionNode->getDoubleValue("far", 0.0);
 606         double offsetX = projectionNode->getDoubleValue("offset-x", 0.0);
 607         double offsetY = projectionNode->getDoubleValue("offset-y", 0.0);
 608         double tan_fovy = tan(DegreesToRadians(fovy*0.5));
 609         double right = tan_fovy * aspectRatio * zNear + offsetX;
 610         double left = -tan_fovy * aspectRatio * zNear + offsetX;
 611         double top = tan_fovy * zNear + offsetY;
 612         double bottom = -tan_fovy * zNear + offsetY;
 613         pOff.makeFrustum(left, right, bottom, top, zNear, zFar);
 614         cameraFlags |= PROJECTION_ABSOLUTE;
 615     } else if ((projectionNode = cameraNode->getNode("frustum")) != 0
 616                || (projectionNode = cameraNode->getNode("ortho")) != 0) {
 617         double top = projectionNode->getDoubleValue("top", 0.0);
 618         double bottom = projectionNode->getDoubleValue("bottom", 0.0);
 619         double left = projectionNode->getDoubleValue("left", 0.0);
 620         double right = projectionNode->getDoubleValue("right", 0.0);
 621         double zNear = projectionNode->getDoubleValue("near", 0.0);
 622         double zFar = projectionNode->getDoubleValue("far", 0.0);
 623         if (cameraNode->getNode("frustum")) {
 624             pOff.makeFrustum(left, right, bottom, top, zNear, zFar);
 625             cameraFlags |= PROJECTION_ABSOLUTE;
 626         } else {
 627             pOff.makeOrtho(left, right, bottom, top, zNear, zFar);
 628             cameraFlags |= (PROJECTION_ABSOLUTE | ORTHO);
 629         }
 630     } else {
 631         // old style shear parameters
 632         double shearx = cameraNode->getDoubleValue("shear-x", 0);
 633         double sheary = cameraNode->getDoubleValue("shear-y", 0);
 634         pOff.makeTranslate(-shearx, -sheary, 0);
 635     }
 636     const SGPropertyNode* textureNode = cameraNode->getNode("texture");
 637     if (textureNode) {
 638         string texName = textureNode->getStringValue("name");
 639         int tex_width = textureNode->getIntValue("width");
 640         int tex_height = textureNode->getIntValue("height");
 641         TextureRectangle* texture = new TextureRectangle;
 642
 643         texture->setTextureSize(tex_width, tex_height);
 644         texture->setInternalFormat(GL_RGB);
 645         texture->setFilter(Texture::MIN_FILTER, Texture::LINEAR);
 646         texture->setFilter(Texture::MAG_FILTER, Texture::LINEAR);
 647         texture->setWrap(Texture::WRAP_S, Texture::CLAMP_TO_EDGE);
 648         texture->setWrap(Texture::WRAP_T, Texture::CLAMP_TO_EDGE);
 649         camera->setDrawBuffer(GL_FRONT);
 650         camera->setReadBuffer(GL_FRONT);
 651         camera->setRenderTargetImplementation(Camera::FRAME_BUFFER_OBJECT);
 652         camera->attach(Camera::COLOR_BUFFER, texture);
 653         _textureTargets[texName] = texture;
 654     } else {
 655         camera->setDrawBuffer(GL_BACK);
 656         camera->setReadBuffer(GL_BACK);
 657     }
 658     const SGPropertyNode* psNode = cameraNode->getNode("panoramic-spherical");
 659     bool useMasterSceneGraph = !psNode;
 660     CameraInfo* info = addCamera(cameraFlags, camera, vOff, pOff,
 661                                  useMasterSceneGraph);
 662     // If a viewport isn't set on the camera, then it's hard to dig it
 663     // out of the SceneView objects in the viewer, and the coordinates
 664     // of mouse events are somewhat bizzare.
 665     SGPropertyNode* viewportNode = cameraNode->getNode("viewport", true);
 666     buildViewport(info, viewportNode, window->gc->getTraits());
 667     updateCameras(info);
 668     // Distortion camera needs the viewport which is created by addCamera().
 669     if (psNode) {
 670         info->flags = info->flags | VIEW_ABSOLUTE;
 671         buildDistortionCamera(psNode, camera);
 672     }
 673     return info;
 674 }
 675
 676 CameraInfo* CameraGroup::buildGUICamera(SGPropertyNode* cameraNode,
 677                                         GraphicsWindow* window)
 678 {
 679     WindowBuilder *wBuild = WindowBuilder::getWindowBuilder();
 680     const SGPropertyNode* windowNode = (cameraNode
 681                                         ? cameraNode->getNode("window")
 682                                         : 0);
 683     if (!window && windowNode) {
 684       // New style window declaration / definition
 685       window = wBuild->buildWindow(windowNode);
 686     }
 687
 688     if (!window) { // buildWindow can fail
 689       SG_LOG(SG_GENERAL, SG_WARN, "CameraGroup::buildGUICamera: failed to build a window");
 690       return NULL;
 691     }
 692
 693     Camera* camera = new Camera;
 694     camera->setAllowEventFocus(false);
 695     camera->setGraphicsContext(window->gc.get());
 696     camera->setViewport(new Viewport);
 697     // XXX Camera needs to be drawn last; eventually the render order
 698     // should be assigned by a camera manager.
 699     camera->setRenderOrder(osg::Camera::POST_RENDER, 100);
 700         camera->setClearMask(0);
 701     camera->setInheritanceMask(CullSettings::ALL_VARIABLES
 702                                & ~(CullSettings::COMPUTE_NEAR_FAR_MODE
 703                                    | CullSettings::CULLING_MODE
 704 #if defined(HAVE_CULLSETTINGS_CLEAR_MASK)
 705                                    | CullSettings::CLEAR_MASK
 706 #endif
 707                                    ));
 708     camera->setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR);
 709     camera->setCullingMode(osg::CullSettings::NO_CULLING);
 710     camera->setProjectionResizePolicy(Camera::FIXED);
 711     camera->setReferenceFrame(Transform::ABSOLUTE_RF);
 712     const int cameraFlags = GUI;
 713     CameraInfo* result = addCamera(cameraFlags, camera, Matrixd::identity(),
 714                                    Matrixd::identity(), false);
 715     SGPropertyNode* viewportNode = cameraNode->getNode("viewport", true);
 716     buildViewport(result, viewportNode, window->gc->getTraits());
 717
 718     // Disable statistics for the GUI camera.
 719     result->camera->setStats(0);
 720     updateCameras(result);
 721     return result;
 722 }
 723
 724 CameraGroup* CameraGroup::buildCameraGroup(osgViewer::Viewer* viewer,
 725                                            SGPropertyNode* gnode)
 726 {
 727     CameraGroup* cgroup = new CameraGroup(viewer);
 728     for (int i = 0; i < gnode->nChildren(); ++i) {
 729         SGPropertyNode* pNode = gnode->getChild(i);
 730         const char* name = pNode->getName();
 731         if (!strcmp(name, "camera")) {
 732             cgroup->buildCamera(pNode);
 733         } else if (!strcmp(name, "window")) {
 734             WindowBuilder::getWindowBuilder()->buildWindow(pNode);
 735         } else if (!strcmp(name, "gui")) {
 736             cgroup->buildGUICamera(pNode);
 737         }
 738     }
 739     bindMemberToNode(gnode, "znear", cgroup, &CameraGroup::_zNear, .1f);
 740     bindMemberToNode(gnode, "zfar", cgroup, &CameraGroup::_zFar, 120000.0f);
 741     bindMemberToNode(gnode, "near-field", cgroup, &CameraGroup::_nearField,
 742                      100.0f);
 743     return cgroup;
 744 }
 745
 746 void CameraGroup::setCameraCullMasks(Node::NodeMask nm)
 747 {
 748     for (CameraIterator i = camerasBegin(), e = camerasEnd(); i != e; ++i) {
 749         CameraInfo* info = i->get();
 750         if (info->flags & GUI)
 751             continue;
 752         if (info->farCamera.valid() && info->farCamera->getNodeMask() != 0) {
 753             info->camera->setCullMask(nm & ~simgear::BACKGROUND_BIT);
 754             info->camera->setCullMaskLeft(nm & ~simgear::BACKGROUND_BIT);
 755             info->camera->setCullMaskRight(nm & ~simgear::BACKGROUND_BIT);
 756             info->farCamera->setCullMask(nm);
 757             info->farCamera->setCullMaskLeft(nm);
 758             info->farCamera->setCullMaskRight(nm);
 759         } else {
 760             info->camera->setCullMask(nm);
 761             info->camera->setCullMaskLeft(nm);
 762             info->camera->setCullMaskRight(nm);
 763         }
 764     }
 765 }
 766
 767 void CameraGroup::resized()
 768 {
 769     for (CameraIterator i = camerasBegin(), e = camerasEnd(); i != e; ++i) {
 770         CameraInfo *info = i->get();
 771         const Viewport* viewport = info->camera->getViewport();
 772         info->x = viewport->x();
 773         info->y = viewport->y();
 774         info->width = viewport->width();
 775         info->height = viewport->height();
 776     }
 777 }
 778
 779 Camera* getGUICamera(CameraGroup* cgroup)
 780 {
 781     CameraGroup::CameraIterator end = cgroup->camerasEnd();
 782     CameraGroup::CameraIterator result
 783         = std::find_if(cgroup->camerasBegin(), end,
 784                        FlagTester<CameraInfo>(CameraGroup::GUI));
 785     if (result != end)
 786         return (*result)->camera.get();
 787     else
 788         return 0;
 789 }
 790
 791 bool computeIntersections(const CameraGroup* cgroup,
 792                           const osgGA::GUIEventAdapter* ea,
 793                           osgUtil::LineSegmentIntersector::Intersections& intersections)
 794 {
 795     using osgUtil::Intersector;
 796     using osgUtil::LineSegmentIntersector;
 797     double x, y;
 798     eventToWindowCoords(ea, x, y);
 799     // Find camera that contains event
 800     for (CameraGroup::ConstCameraIterator iter = cgroup->camerasBegin(),
 801              e = cgroup->camerasEnd();
 802          iter != e;
 803          ++iter) {
 804         const CameraInfo* cinfo = iter->get();
 805         if ((cinfo->flags & CameraGroup::DO_INTERSECTION_TEST) == 0)
 806             continue;
 807         const Camera* camera = cinfo->camera.get();
 808         if (camera->getGraphicsContext() != ea->getGraphicsContext())
 809             continue;
 810         const Viewport* viewport = camera->getViewport();
 811         double epsilon = 0.5;
 812         if (!(x >= viewport->x() - epsilon
 813               && x < viewport->x() + viewport->width() -1.0 + epsilon
 814               && y >= viewport->y() - epsilon
 815               && y < viewport->y() + viewport->height() -1.0 + epsilon))
 816             continue;
 817         Vec4d start(x, y, 0.0, 1.0);
 818         Vec4d end(x, y, 1.0, 1.0);
 819         Matrix windowMat = viewport->computeWindowMatrix();
 820         Matrix startPtMat = Matrix::inverse(camera->getProjectionMatrix()
 821                                             * windowMat);
 822         Matrix endPtMat;
 823         if (!cinfo->farCamera.valid() || cinfo->farCamera->getNodeMask() == 0)
 824             endPtMat = startPtMat;
 825         else
 826             endPtMat = Matrix::inverse(cinfo->farCamera->getProjectionMatrix()
 827                                        * windowMat);
 828         start = start * startPtMat;
 829         start /= start.w();
 830         end = end * endPtMat;
 831         end /= end.w();
 832         ref_ptr<LineSegmentIntersector> picker
 833             = new LineSegmentIntersector(Intersector::VIEW,
 834                                          Vec3d(start.x(), start.y(), start.z()),
 835                                          Vec3d(end.x(), end.y(), end.z()));
 836         osgUtil::IntersectionVisitor iv(picker.get());
 837         const_cast<Camera*>(camera)->accept(iv);
 838         if (picker->containsIntersections()) {
 839             intersections = picker->getIntersections();
 840             return true;
 841         } else {
 842             break;
 843         }
 844     }
 845     intersections.clear();
 846     return false;
 847 }
 848
 849 void warpGUIPointer(CameraGroup* cgroup, int x, int y)
 850 {
 851     using osgViewer::GraphicsWindow;
 852     Camera* guiCamera = getGUICamera(cgroup);
 853     if (!guiCamera)
 854         return;
 855     Viewport* vport = guiCamera->getViewport();
 856     GraphicsWindow* gw
 857         = dynamic_cast<GraphicsWindow*>(guiCamera->getGraphicsContext());
 858     if (!gw)
 859         return;
 860     globals->get_renderer()->getEventHandler()->setMouseWarped();
 861     // Translate the warp request into the viewport of the GUI camera,
 862     // send the request to the window, then transform the coordinates
 863     // for the Viewer's event queue.
 864     double wx = x + vport->x();
 865     double wyUp = vport->height() + vport->y() - y;
 866     double wy;
 867     const GraphicsContext::Traits* traits = gw->getTraits();
 868     if (gw->getEventQueue()->getCurrentEventState()->getMouseYOrientation()
 869         == osgGA::GUIEventAdapter::Y_INCREASING_DOWNWARDS) {
 870         wy = traits->height - wyUp;
 871     } else {
 872         wy = wyUp;
 873     }
 874     gw->getEventQueue()->mouseWarped(wx, wy);
 875     gw->requestWarpPointer(wx, wy);
 876     osgGA::GUIEventAdapter* eventState
 877         = cgroup->getViewer()->getEventQueue()->getCurrentEventState();
 878     double viewerX
 879         = (eventState->getXmin()
 880            + ((wx / double(traits->width))
 881               * (eventState->getXmax() - eventState->getXmin())));
 882     double viewerY
 883         = (eventState->getYmin()
 884            + ((wyUp / double(traits->height))
 885               * (eventState->getYmax() - eventState->getYmin())));
 886     cgroup->getViewer()->getEventQueue()->mouseWarped(viewerX, viewerY);
 887 }
 888 }