simgear/canvas/Canvas.cxx

   1 // The canvas for rendering with the 2d API
   2 //
   3 // Copyright (C) 2012  Thomas Geymayer <tomgey@gmail.com>
   4 //
   5 // This library is free software; you can redistribute it and/or
   6 // modify it under the terms of the GNU Library General Public
   7 // License as published by the Free Software Foundation; either
   8 // version 2 of the License, or (at your option) any later version.
   9 //
  10 // This library is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 // Library General Public License for more details.
  14 //
  15 // You should have received a copy of the GNU Library General Public
  16 // License along with this library; if not, write to the Free Software
  17 // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA
  18
  19 #include "Canvas.hxx"
  20 #include "CanvasEventManager.hxx"
  21 #include "CanvasEventVisitor.hxx"
  22 #include <simgear/canvas/MouseEvent.hxx>
  23 #include <simgear/canvas/CanvasPlacement.hxx>
  24 #include <simgear/scene/util/parse_color.hxx>
  25 #include <simgear/scene/util/RenderConstants.hxx>
  26
  27 #include <osg/Camera>
  28 #include <osg/Geode>
  29 #include <osgText/Text>
  30 #include <osgViewer/Viewer>
  31
  32 #include <boost/algorithm/string/predicate.hpp>
  33 #include <boost/foreach.hpp>
  34
  35 namespace simgear
  36 {
  37 namespace canvas
  38 {
  39
  40   //----------------------------------------------------------------------------
  41   Canvas::CullCallback::CullCallback(const CanvasWeakPtr& canvas):
  42     _canvas( canvas )
  43   {
  44
  45   }
  46
  47   //----------------------------------------------------------------------------
  48   void Canvas::CullCallback::operator()( osg::Node* node,
  49                                          osg::NodeVisitor* nv )
  50   {
  51     if( (nv->getTraversalMask() & simgear::MODEL_BIT) && !_canvas.expired() )
  52       _canvas.lock()->enableRendering();
  53
  54     traverse(node, nv);
  55   }
  56
  57   //----------------------------------------------------------------------------
  58   Canvas::Canvas(SGPropertyNode* node):
  59     PropertyBasedElement(node),
  60     _canvas_mgr(0),
  61     _event_manager(new EventManager),
  62     _size_x(-1),
  63     _size_y(-1),
  64     _view_width(-1),
  65     _view_height(-1),
  66     _status(node, "status"),
  67     _status_msg(node, "status-msg"),
  68     _sampling_dirty(false),
  69     _render_dirty(true),
  70     _visible(true),
  71     _render_always(false)
  72   {
  73     _status = 0;
  74     setStatusFlags(MISSING_SIZE_X | MISSING_SIZE_Y);
  75   }
  76
  77   //----------------------------------------------------------------------------
  78   void Canvas::onDestroy()
  79   {
  80     if( _root_group )
  81     {
  82       _root_group->clearEventListener();
  83       _root_group->onDestroy();
  84     }
  85   }
  86
  87   //----------------------------------------------------------------------------
  88   void Canvas::setSystemAdapter(const SystemAdapterPtr& system_adapter)
  89   {
  90     _system_adapter = system_adapter;
  91     _texture.setSystemAdapter(system_adapter);
  92   }
  93
  94   //----------------------------------------------------------------------------
  95   SystemAdapterPtr Canvas::getSystemAdapter() const
  96   {
  97     return _system_adapter;
  98   }
  99
 100   //----------------------------------------------------------------------------
 101   void Canvas::setCanvasMgr(CanvasMgr* canvas_mgr)
 102   {
 103     _canvas_mgr = canvas_mgr;
 104   }
 105
 106   //----------------------------------------------------------------------------
 107   CanvasMgr* Canvas::getCanvasMgr() const
 108   {
 109     return _canvas_mgr;
 110   }
 111
 112   //----------------------------------------------------------------------------
 113   bool Canvas::isInit() const
 114   {
 115     return _texture.serviceable();
 116   }
 117
 118   //----------------------------------------------------------------------------
 119   void Canvas::addParentCanvas(const CanvasWeakPtr& canvas)
 120   {
 121     if( canvas.expired() )
 122     {
 123       SG_LOG
 124       (
 125         SG_GENERAL,
 126         SG_WARN,
 127         "Canvas::addParentCanvas(" << _node->getPath(true) << "): "
 128         "got an expired parent!"
 129       );
 130       return;
 131     }
 132
 133     _parent_canvases.insert(canvas);
 134   }
 135
 136   //----------------------------------------------------------------------------
 137   void Canvas::addChildCanvas(const CanvasWeakPtr& canvas)
 138   {
 139     if( canvas.expired() )
 140     {
 141       SG_LOG
 142       (
 143         SG_GENERAL,
 144         SG_WARN,
 145         "Canvas::addChildCanvas(" << _node->getPath(true) << "): "
 146         " got an expired child!"
 147       );
 148       return;
 149     }
 150
 151     _child_canvases.insert(canvas);
 152   }
 153
 154   //----------------------------------------------------------------------------
 155   void Canvas::removeParentCanvas(const CanvasWeakPtr& canvas)
 156   {
 157     _parent_canvases.erase(canvas);
 158   }
 159
 160   //----------------------------------------------------------------------------
 161   void Canvas::removeChildCanvas(const CanvasWeakPtr& canvas)
 162   {
 163     _child_canvases.erase(canvas);
 164   }
 165
 166   //----------------------------------------------------------------------------
 167   GroupPtr Canvas::createGroup(const std::string& name)
 168   {
 169     return _root_group->createChild<Group>(name);
 170   }
 171
 172   //----------------------------------------------------------------------------
 173   GroupPtr Canvas::getGroup(const std::string& name)
 174   {
 175     return _root_group->getChild<Group>(name);
 176   }
 177
 178   //----------------------------------------------------------------------------
 179   GroupPtr Canvas::getOrCreateGroup(const std::string& name)
 180   {
 181     return _root_group->getOrCreateChild<Group>(name);
 182   }
 183
 184   //----------------------------------------------------------------------------
 185   GroupPtr Canvas::getRootGroup()
 186   {
 187     return _root_group;
 188   }
 189
 190   //----------------------------------------------------------------------------
 191   void Canvas::enableRendering(bool force)
 192   {
 193     _visible = true;
 194     if( force )
 195       _render_dirty = true;
 196   }
 197
 198   //----------------------------------------------------------------------------
 199   void Canvas::update(double delta_time_sec)
 200   {
 201     if(    (!_texture.serviceable() && _status != STATUS_DIRTY)
 202         || (_status & CREATE_FAILED) )
 203       return;
 204
 205     if( _status == STATUS_DIRTY )
 206     {
 207       _texture.setSize(_size_x, _size_y);
 208
 209       if( !_texture.serviceable() )
 210       {
 211         _texture.useImageCoords(true);
 212         _texture.useStencil(true);
 213         _texture.allocRT(/*_camera_callback*/);
 214       }
 215       else
 216       {
 217         // Resizing causes a new texture to be created so we need to reapply all
 218         // existing placements
 219         reloadPlacements();
 220       }
 221
 222       osg::Camera* camera = _texture.getCamera();
 223
 224       osg::Vec4 clear_color(0.0f, 0.0f, 0.0f , 1.0f);
 225       parseColor(_node->getStringValue("background"), clear_color);
 226       camera->setClearColor(clear_color);
 227
 228       camera->addChild(_root_group->getMatrixTransform());
 229
 230       // Ensure objects are drawn in order of traversal
 231       camera->getOrCreateStateSet()->setBinName("TraversalOrderBin");
 232
 233       if( _texture.serviceable() )
 234       {
 235         setStatusFlags(STATUS_OK);
 236         setStatusFlags(STATUS_DIRTY, false);
 237         _render_dirty = true;
 238       }
 239       else
 240       {
 241         setStatusFlags(CREATE_FAILED);
 242         return;
 243       }
 244     }
 245
 246     if( _visible || _render_always )
 247     {
 248       BOOST_FOREACH(CanvasWeakPtr canvas, _child_canvases)
 249       {
 250         // TODO should we check if the image the child canvas is displayed
 251         //      within is really visible?
 252         if( !canvas.expired() )
 253           canvas.lock()->_visible = true;
 254       }
 255
 256       if( _render_dirty )
 257       {
 258         // Also mark all canvases this canvas is displayed within as dirty
 259         BOOST_FOREACH(CanvasWeakPtr canvas, _parent_canvases)
 260         {
 261           if( !canvas.expired() )
 262             canvas.lock()->_render_dirty = true;
 263         }
 264       }
 265
 266       _texture.setRender(_render_dirty);
 267
 268       _render_dirty = false;
 269       _visible = false;
 270     }
 271     else
 272       _texture.setRender(false);
 273
 274     _root_group->update(delta_time_sec);
 275
 276     if( _sampling_dirty )
 277     {
 278       _texture.setSampling(
 279         _node->getBoolValue("mipmapping"),
 280         _node->getIntValue("coverage-samples"),
 281         _node->getIntValue("color-samples")
 282       );
 283       _sampling_dirty = false;
 284       _render_dirty = true;
 285     }
 286
 287     while( !_dirty_placements.empty() )
 288     {
 289       SGPropertyNode *node = _dirty_placements.back();
 290       _dirty_placements.pop_back();
 291
 292       if( node->getIndex() >= static_cast<int>(_placements.size()) )
 293         // New placement
 294         _placements.resize(node->getIndex() + 1);
 295       else
 296         // Remove possibly existing placements
 297         _placements[ node->getIndex() ].clear();
 298
 299       // Get new placements
 300       PlacementFactoryMap::const_iterator placement_factory =
 301         _placement_factories.find( node->getStringValue("type", "object") );
 302       if( placement_factory != _placement_factories.end() )
 303       {
 304         Placements& placements = _placements[ node->getIndex() ] =
 305           placement_factory->second
 306           (
 307             node,
 308             boost::static_pointer_cast<Canvas>(_self.lock())
 309           );
 310         node->setStringValue
 311         (
 312           "status-msg",
 313           placements.empty() ? "No match" : "Ok"
 314         );
 315       }
 316       else
 317         node->setStringValue("status-msg", "Unknown placement type");
 318     }
 319   }
 320
 321   //----------------------------------------------------------------------------
 322   naRef Canvas::addEventListener(const nasal::CallContext& ctx)
 323   {
 324     if( !_root_group.get() )
 325       naRuntimeError(ctx.c, "Canvas: No root group!");
 326
 327     return _root_group->addEventListener(ctx);
 328   }
 329
 330   //----------------------------------------------------------------------------
 331   void Canvas::setSizeX(int sx)
 332   {
 333     if( _size_x == sx )
 334       return;
 335     _size_x = sx;
 336     setStatusFlags(STATUS_DIRTY);
 337
 338     if( _size_x <= 0 )
 339       setStatusFlags(MISSING_SIZE_X);
 340     else
 341       setStatusFlags(MISSING_SIZE_X, false);
 342
 343     // reset flag to allow creation with new size
 344     setStatusFlags(CREATE_FAILED, false);
 345   }
 346
 347   //----------------------------------------------------------------------------
 348   void Canvas::setSizeY(int sy)
 349   {
 350     if( _size_y == sy )
 351       return;
 352     _size_y = sy;
 353     setStatusFlags(STATUS_DIRTY);
 354
 355     if( _size_y <= 0 )
 356       setStatusFlags(MISSING_SIZE_Y);
 357     else
 358       setStatusFlags(MISSING_SIZE_Y, false);
 359
 360     // reset flag to allow creation with new size
 361     setStatusFlags(CREATE_FAILED, false);
 362   }
 363
 364   //----------------------------------------------------------------------------
 365   int Canvas::getSizeX() const
 366   {
 367     return _size_x;
 368   }
 369
 370   //----------------------------------------------------------------------------
 371   int Canvas::getSizeY() const
 372   {
 373     return _size_y;
 374   }
 375
 376   //----------------------------------------------------------------------------
 377   void Canvas::setViewWidth(int w)
 378   {
 379     if( _view_width == w )
 380       return;
 381     _view_width = w;
 382
 383     _texture.setViewSize(_view_width, _view_height);
 384   }
 385
 386   //----------------------------------------------------------------------------
 387   void Canvas::setViewHeight(int h)
 388   {
 389     if( _view_height == h )
 390       return;
 391     _view_height = h;
 392
 393     _texture.setViewSize(_view_width, _view_height);
 394   }
 395
 396   //----------------------------------------------------------------------------
 397   int Canvas::getViewWidth() const
 398   {
 399     return _texture.getViewSize().x();
 400   }
 401
 402   //----------------------------------------------------------------------------
 403   int Canvas::getViewHeight() const
 404   {
 405     return _texture.getViewSize().y();
 406   }
 407
 408   //----------------------------------------------------------------------------
 409   SGRect<int> Canvas::getViewport() const
 410   {
 411     return SGRect<int>(0, 0, getViewWidth(), getViewHeight());
 412   }
 413
 414   //----------------------------------------------------------------------------
 415   bool Canvas::handleMouseEvent(const MouseEventPtr& event)
 416   {
 417     if( !_root_group.get() )
 418       return false;
 419
 420     EventVisitor visitor( EventVisitor::TRAVERSE_DOWN,
 421                           event->getClientPos(),
 422                           event->getDelta() );
 423     if( !_root_group->accept(visitor) )
 424       return false;
 425
 426     return _event_manager->handleEvent(event, visitor.getPropagationPath());
 427   }
 428
 429   //----------------------------------------------------------------------------
 430   void Canvas::childAdded( SGPropertyNode * parent,
 431                            SGPropertyNode * child )
 432   {
 433     if( parent != _node )
 434       return;
 435
 436     if( child->getNameString() == "placement" )
 437       _dirty_placements.push_back(child);
 438     else if( _root_group.get() )
 439       static_cast<Element*>(_root_group.get())->childAdded(parent, child);
 440   }
 441
 442   //----------------------------------------------------------------------------
 443   void Canvas::childRemoved( SGPropertyNode * parent,
 444                              SGPropertyNode * child )
 445   {
 446     _render_dirty = true;
 447
 448     if( parent != _node )
 449       return;
 450
 451     if( child->getNameString() == "placement" )
 452       _placements[ child->getIndex() ].clear();
 453     else if( _root_group.get() )
 454       static_cast<Element*>(_root_group.get())->childRemoved(parent, child);
 455   }
 456
 457   //----------------------------------------------------------------------------
 458   void Canvas::valueChanged(SGPropertyNode* node)
 459   {
 460     if(    boost::starts_with(node->getNameString(), "status")
 461         || node->getParent()->getNameString() == "bounding-box" )
 462       return;
 463     _render_dirty = true;
 464
 465     bool handled = true;
 466     if(    node->getParent()->getParent() == _node
 467         && node->getParent()->getNameString() == "placement" )
 468     {
 469       size_t index = node->getIndex();
 470       if( index < _placements.size() )
 471       {
 472         Placements& placements = _placements[index];
 473         if( !placements.empty() )
 474         {
 475           bool placement_dirty = false;
 476           BOOST_FOREACH(PlacementPtr& placement, placements)
 477           {
 478             // check if change can be directly handled by placement
 479             if(    placement->getProps() == node->getParent()
 480                 && !placement->childChanged(node) )
 481               placement_dirty = true;
 482           }
 483
 484           if( !placement_dirty )
 485             return;
 486         }
 487       }
 488
 489       // prevent double updates...
 490       for( size_t i = 0; i < _dirty_placements.size(); ++i )
 491       {
 492         if( node->getParent() == _dirty_placements[i] )
 493           return;
 494       }
 495
 496       _dirty_placements.push_back(node->getParent());
 497     }
 498     else if( node->getParent() == _node )
 499     {
 500       if( node->getNameString() == "background" )
 501       {
 502         osg::Vec4 color;
 503         if( _texture.getCamera() && parseColor(node->getStringValue(), color) )
 504         {
 505           _texture.getCamera()->setClearColor(color);
 506           _render_dirty = true;
 507         }
 508       }
 509       else if(    node->getNameString() == "mipmapping"
 510               || node->getNameString() == "coverage-samples"
 511               || node->getNameString() == "color-samples" )
 512       {
 513         _sampling_dirty = true;
 514       }
 515       else if( node->getNameString() == "additive-blend" )
 516       {
 517         _texture.useAdditiveBlend( node->getBoolValue() );
 518       }
 519       else if( node->getNameString() == "render-always" )
 520       {
 521         _render_always = node->getBoolValue();
 522       }
 523       else if( node->getNameString() == "size" )
 524       {
 525         if( node->getIndex() == 0 )
 526           setSizeX( node->getIntValue() );
 527         else if( node->getIndex() == 1 )
 528           setSizeY( node->getIntValue() );
 529       }
 530       else if( node->getNameString() == "view" )
 531       {
 532         if( node->getIndex() == 0 )
 533           setViewWidth( node->getIntValue() );
 534         else if( node->getIndex() == 1 )
 535           setViewHeight( node->getIntValue() );
 536       }
 537       else if( node->getNameString() == "freeze" )
 538         _texture.setRender( node->getBoolValue() );
 539       else
 540         handled = false;
 541     }
 542     else
 543       handled = false;
 544
 545     if( !handled && _root_group.get() )
 546       _root_group->valueChanged(node);
 547   }
 548
 549   //----------------------------------------------------------------------------
 550   osg::Texture2D* Canvas::getTexture() const
 551   {
 552     return _texture.getTexture();
 553   }
 554
 555   //----------------------------------------------------------------------------
 556   Canvas::CullCallbackPtr Canvas::getCullCallback() const
 557   {
 558     return _cull_callback;
 559   }
 560
 561   //----------------------------------------------------------------------------
 562   void Canvas::reloadPlacements(const std::string& type)
 563   {
 564     for(size_t i = 0; i < _placements.size(); ++i)
 565     {
 566       if( _placements[i].empty() )
 567         continue;
 568
 569       SGPropertyNode* child = _placements[i].front()->getProps();
 570       if(    type.empty()
 571              // reload if type matches or no type specified
 572           || child->getStringValue("type", type.c_str()) == type )
 573       {
 574         _dirty_placements.push_back(child);
 575       }
 576     }
 577   }
 578
 579   //----------------------------------------------------------------------------
 580   void Canvas::addPlacementFactory( const std::string& type,
 581                                     PlacementFactory factory )
 582   {
 583     if( _placement_factories.find(type) != _placement_factories.end() )
 584       SG_LOG
 585       (
 586         SG_GENERAL,
 587         SG_WARN,
 588         "Canvas::addPlacementFactory: replace existing factor for type " << type
 589       );
 590
 591     _placement_factories[type] = factory;
 592   }
 593
 594   //----------------------------------------------------------------------------
 595   void Canvas::setSelf(const PropertyBasedElementPtr& self)
 596   {
 597     PropertyBasedElement::setSelf(self);
 598
 599     CanvasPtr canvas = boost::static_pointer_cast<Canvas>(self);
 600
 601     _root_group.reset( new Group(canvas, _node) );
 602     _root_group->setSelf(_root_group);
 603
 604     // Remove automatically created property listener as we forward them on our
 605     // own
 606     _root_group->removeListener();
 607
 608     _cull_callback = new CullCallback(canvas);
 609   }
 610
 611   //----------------------------------------------------------------------------
 612   void Canvas::setStatusFlags(unsigned int flags, bool set)
 613   {
 614     if( set )
 615       _status |= flags;
 616     else
 617       _status &= ~flags;
 618
 619     if( (_status & MISSING_SIZE_X) && (_status & MISSING_SIZE_Y) )
 620       _status_msg = "Missing size";
 621     else if( _status & MISSING_SIZE_X )
 622       _status_msg = "Missing size-x";
 623     else if( _status & MISSING_SIZE_Y )
 624       _status_msg = "Missing size-y";
 625     else if( _status & CREATE_FAILED )
 626       _status_msg = "Creating render target failed";
 627     else if( _status == STATUS_DIRTY )
 628       _status_msg = "Creation pending...";
 629     else
 630       _status_msg = "Ok";
 631   }
 632
 633   //----------------------------------------------------------------------------
 634   Canvas::PlacementFactoryMap Canvas::_placement_factories;
 635
 636 } // namespace canvas
 637 } // namespace simgear