src/Cockpit/od_gauge.cxx

   1 // Owner Drawn Gauge helper class
   2 //
   3 // Written by Harald JOHNSEN, started May 2005.
   4 //
   5 // Copyright (C) 2005  Harald JOHNSEN
   6 //
   7 // Ported to OSG by Tim Moore - Jun 2007
   8 //
   9 // Heavily modified to be usable for the 2d Canvas by Thomas Geymayer - April 2012
  10 // Supports now multisampling/mipmapping, usage of the stencil buffer and placing
  11 // the texture in the scene by certain filter criteria
  12 //
  13 // This program is free software; you can redistribute it and/or
  14 // modify it under the terms of the GNU General Public License as
  15 // published by the Free Software Foundation; either version 2 of the
  16 // License, or (at your option) any later version.
  17 //
  18 // This program is distributed in the hope that it will be useful, but
  19 // WITHOUT ANY WARRANTY; without even the implied warranty of
  20 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21 // General Public License for more details.
  22 //
  23 // You should have received a copy of the GNU General Public License
  24 // along with this program; if not, write to the Free Software
  25 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  26 //
  27 //
  28
  29 #ifdef HAVE_CONFIG_H
  30 #  include "config.h"
  31 #endif
  32
  33 #include <osg/Texture2D>
  34 #include <osg/AlphaFunc>
  35 #include <osg/BlendFunc>
  36 #include <osg/Camera>
  37 #include <osg/Geode>
  38 #include <osg/NodeVisitor>
  39 #include <osg/Matrix>
  40 #include <osg/PolygonMode>
  41 #include <osg/ShadeModel>
  42 #include <osg/StateSet>
  43 #include <osg/FrameBufferObject> // for GL_DEPTH_STENCIL_EXT on Windows
  44
  45 #include <osgDB/FileNameUtils>
  46
  47 #include <simgear/scene/material/EffectGeode.hxx>
  48 #include <simgear/scene/util/RenderConstants.hxx>
  49
  50 #include <Main/globals.hxx>
  51 #include <Viewer/renderer.hxx>
  52 #include <Scenery/scenery.hxx>
  53 #include "od_gauge.hxx"
  54
  55 #include <cassert>
  56
  57 //------------------------------------------------------------------------------
  58 static void cbAddCamera(osg::Camera* cam)
  59 {
  60   globals->get_renderer()->addCamera(cam, false);
  61 }
  62
  63 //------------------------------------------------------------------------------
  64 static void cbRemoveCamera(osg::Camera* cam)
  65 {
  66   globals->get_renderer()->removeCamera(cam);
  67 }
  68
  69 //------------------------------------------------------------------------------
  70 FGODGauge::FGODGauge():
  71   simgear::ODGauge(cbAddCamera, cbRemoveCamera)
  72 {
  73
  74 }
  75
  76 //------------------------------------------------------------------------------
  77 FGODGauge::~FGODGauge()
  78 {
  79
  80 }
  81
  82 /**
  83  * Replace a texture in the airplane model with the gauge texture.
  84  */
  85 class ReplaceStaticTextureVisitor:
  86   public osg::NodeVisitor
  87 {
  88   public:
  89
  90     ReplaceStaticTextureVisitor( const char* name,
  91                                  osg::Texture2D* new_texture ):
  92         osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN),
  93         _tex_name( osgDB::getSimpleFileName(name) ),
  94         _new_texture(new_texture)
  95     {}
  96
  97     ReplaceStaticTextureVisitor( const SGPropertyNode* placement,
  98                                  osg::Texture2D* new_texture,
  99                                  osg::NodeCallback* cull_callback = 0 ):
 100         osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN),
 101         _tex_name( osgDB::getSimpleFileName(
 102           placement->getStringValue("texture"))
 103         ),
 104         _node_name( placement->getStringValue("node") ),
 105         _parent_name( placement->getStringValue("parent") ),
 106         _new_texture(new_texture),
 107         _cull_callback(cull_callback)
 108     {
 109       if(    _tex_name.empty()
 110           && _node_name.empty()
 111           && _parent_name.empty() )
 112         SG_LOG
 113         (
 114           SG_GL,
 115           SG_WARN,
 116           "No filter criterion for replacing texture. "
 117           " Every texture will be replaced!"
 118         );
 119     }
 120
 121     /**
 122      * Get a list of groups which have been inserted into the scene graph to
 123      * replace the given texture
 124      */
 125     canvas::Placements& getPlacements()
 126     {
 127       return _placements;
 128     }
 129
 130     virtual void apply(osg::Geode& node)
 131     {
 132       simgear::EffectGeode* eg = dynamic_cast<simgear::EffectGeode*>(&node);
 133       if( !eg )
 134         return;
 135
 136       osg::StateSet* ss = eg->getEffect()->getDefaultStateSet();
 137       if( !ss )
 138         return;
 139
 140       osg::Group *parent = node.getParent(0);
 141       if( !_node_name.empty() && parent->getName() != _node_name )
 142         return;
 143
 144       if( !_parent_name.empty() )
 145       {
 146         // Traverse nodes upwards starting at the parent node (skip current
 147         // node)
 148         const osg::NodePath& np = getNodePath();
 149         bool found = false;
 150         for( int i = static_cast<int>(np.size()) - 2; i >= 0; --i )
 151         {
 152           const osg::Node* path_segment = np[i];
 153           const osg::Node* path_parent = path_segment->getParent(0);
 154
 155           // A node without a name is always the parent of the root node of
 156           // the model just containing the file name
 157           if( path_parent && path_parent->getName().empty() )
 158             return;
 159
 160           if( path_segment->getName() == _parent_name )
 161           {
 162             found = true;
 163             break;
 164           }
 165         }
 166
 167         if( !found )
 168           return;
 169       }
 170
 171       for( size_t unit = 0; unit < ss->getNumTextureAttributeLists(); ++unit )
 172       {
 173         osg::Texture2D* tex = dynamic_cast<osg::Texture2D*>
 174         (
 175           ss->getTextureAttribute(unit, osg::StateAttribute::TEXTURE)
 176         );
 177
 178         if( !tex || !tex->getImage() || tex == _new_texture )
 179           continue;
 180
 181         if( !_tex_name.empty() )
 182         {
 183           std::string tex_name = tex->getImage()->getFileName();
 184           std::string tex_name_simple = osgDB::getSimpleFileName(tex_name);
 185           if( !osgDB::equalCaseInsensitive(_tex_name, tex_name_simple) )
 186             continue;
 187         }
 188
 189         // insert a new group between the geode an it's parent which overrides
 190         // the texture
 191         osg::ref_ptr<osg::Group> group = new osg::Group;
 192         group->setName("canvas texture group");
 193         group->addChild(eg);
 194         parent->removeChild(eg);
 195         parent->addChild(group);
 196
 197         if( _cull_callback )
 198           group->setCullCallback(_cull_callback);
 199
 200         _placements.push_back(
 201           canvas::PlacementPtr(new ObjectPlacement(group))
 202         );
 203
 204         osg::StateSet* stateSet = group->getOrCreateStateSet();
 205         stateSet->setTextureAttribute( unit, _new_texture,
 206                                              osg::StateAttribute::OVERRIDE );
 207         stateSet->setTextureMode( unit, GL_TEXTURE_2D,
 208                                         osg::StateAttribute::ON );
 209
 210         SG_LOG
 211         (
 212           SG_GL,
 213           SG_INFO,
 214              "Replaced texture '" << _tex_name << "'"
 215           << " for object '" << parent->getName() << "'"
 216           << (!_parent_name.empty() ? " with parent '" + _parent_name + "'"
 217                                     : "")
 218         );
 219         return;
 220       }
 221     }
 222
 223   protected:
 224
 225     class ObjectPlacement:
 226       public canvas::Placement
 227     {
 228       public:
 229         ObjectPlacement(osg::ref_ptr<osg::Group> group):
 230           _group(group)
 231         {}
 232
 233         /**
 234          * Remove placement from the scene
 235          */
 236         virtual ~ObjectPlacement()
 237         {
 238           assert( _group->getNumChildren() == 1 );
 239           osg::Node *child = _group->getChild(0);
 240
 241           if( _group->getNumParents() )
 242           {
 243             osg::Group *parent = _group->getParent(0);
 244             parent->addChild(child);
 245             parent->removeChild(_group);
 246           }
 247
 248           _group->removeChild(child);
 249         }
 250
 251       private:
 252         osg::ref_ptr<osg::Group> _group;
 253     };
 254
 255     std::string _tex_name,      ///<! Name of texture to be replaced
 256                 _node_name,     ///<! Only replace if node name matches
 257                 _parent_name;   ///<! Only replace if any parent node matches
 258                                 ///   given name (all the tree upwards)
 259     osg::Texture2D     *_new_texture;
 260     osg::NodeCallback  *_cull_callback;
 261
 262     canvas::Placements _placements;
 263 };
 264
 265 //------------------------------------------------------------------------------
 266 canvas::Placements FGODGauge::set_texture( const char* name,
 267                                            osg::Texture2D* new_texture )
 268 {
 269   osg::Group* root = globals->get_scenery()->get_aircraft_branch();
 270   ReplaceStaticTextureVisitor visitor(name, new_texture);
 271   root->accept(visitor);
 272   return visitor.getPlacements();
 273 }
 274
 275 //------------------------------------------------------------------------------
 276 canvas::Placements FGODGauge::set_texture( const SGPropertyNode* placement,
 277                                            osg::Texture2D* new_texture,
 278                                            osg::NodeCallback* cull_callback )
 279 {
 280   osg::Group* root = globals->get_scenery()->get_aircraft_branch();
 281   ReplaceStaticTextureVisitor visitor(placement, new_texture, cull_callback);
 282   root->accept(visitor);
 283   return visitor.getPlacements();
 284 }