Line data    Source code

       1             : 
       2             : /* Copyright (c) 2009-2015, Stefan Eilemann <eile@equalizergraphics.com>
       3             :  *
       4             :  * This library is free software; you can redistribute it and/or modify it under
       5             :  * the terms of the GNU Lesser General Public License version 2.1 as published
       6             :  * by the Free Software Foundation.
       7             :  *
       8             :  * This library is distributed in the hope that it will be useful, but WITHOUT
       9             :  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
      10             :  * FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
      11             :  * details.
      12             :  *
      13             :  * You should have received a copy of the GNU Lesser General Public License
      14             :  * along with this library; if not, write to the Free Software Foundation, Inc.,
      15             :  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
      16             :  */
      17             : 
      18             : #ifndef EQ_OBSERVER_H
      19             : #define EQ_OBSERVER_H
      20             : 
      21             : #include <eq/api.h>
      22             : #include <eq/types.h>
      23             : #include <eq/fabric/observer.h>         // base class
      24             : 
      25             : namespace eq
      26             : {
      27             : namespace detail { class Observer; }
      28             : 
      29             : /**
      30             :  * An Observer looks at one or more views from a certain position (head matrix)
      31             :  * with a given eye separation. Multiple observers in a configuration can be
      32             :  * used to update independent viewers from one configuration, e.g., a control
      33             :  * host, a HMD and a Cave.
      34             :  *
      35             :  * @sa fabric::Observer
      36             :  */
      37             : class Observer : public fabric::Observer< Config, Observer >
      38             : {
      39             : public:
      40             :     /** Construct a new observer. @version 1.0 */
      41             :     EQ_API explicit Observer( Config* parent );
      42             : 
      43             :     /** Destruct this observer. @version 1.0 */
      44             :     EQ_API virtual ~Observer();
      45             : 
      46             :     /** @name Operations */
      47             :     //@{
      48             :     /**
      49             :      * Handle an event.
      50             :      *
      51             :      * The event type and originator identifier (of this object) have
      52             :      * already been consumed from the given command.
      53             :      *
      54             :      * @param command The event input command.
      55             :      * @return true if the event requires a redraw, false otherwise.
      56             :      */
      57             :     EQ_API virtual bool handleEvent( EventICommand& command );
      58             :     //@}
      59             : 
      60             :     /** @name Data Access */
      61             :     //@{
      62             :     /** @return the Server of this observer. @version 1.0 */
      63             :     EQ_API ServerPtr getServer();
      64             :     //@}
      65             : 
      66           2 :     void addView( View* ) { /* nop */ } //!< @internal
      67           0 :     void removeView( View* ) { /* nop */ } //!< @internal
      68             : 
      69             : protected:
      70             :     /**
      71             :      * @name Callbacks
      72             :      *
      73             :      * Callbacks are called by Equalizer during rendering to execute various
      74             :      * actions from the application main thread before sending the
      75             :      * corresponding command to the server.
      76             :      */
      77             :     //@{
      78             :     /** Initialize this observer. @version 1.5.2 */
      79             :     EQ_API virtual bool configInit();
      80             :     friend class detail::InitVisitor;
      81             : 
      82             :     /** Exit this observer. @version 1.5.2 */
      83             :     EQ_API virtual bool configExit();
      84             :     friend class detail::ExitVisitor;
      85             : 
      86             :     /**
      87             :      * Start rendering a frame.
      88             :      *
      89             :      * Called once at the beginning of each frame before the Config::frame
      90             :      * is send to the server, to do per-frame updates of observer-specific
      91             :      * data.
      92             :      *
      93             :      * @param frameNumber the frame to start.
      94             :      * @version 1.5.2
      95             :      */
      96             :     EQ_API virtual void frameStart( const uint32_t frameNumber );
      97             :     friend class detail::FrameVisitor;
      98             :     //@}
      99             : 
     100             : private:
     101             :     detail::Observer* const _impl;
     102             : };
     103             : }
     104             : #endif // EQ_OBSERVER_H