Dogcows Code - chaz/yoink/blob - src/Moof/Engine.hh

   1
   2 /*******************************************************************************
   3
   4  Copyright (c) 2009, Charles McGarvey
   5  All rights reserved.
   6
   7  Redistribution   and   use  in  source  and  binary  forms,  with  or  without
   8  modification, are permitted provided that the following conditions are met:
   9
  10    * Redistributions  of  source  code  must retain the above copyright notice,
  11      this list of conditions and the following disclaimer.
  12    * Redistributions  in binary form must reproduce the above copyright notice,
  13      this  list of conditions and the following disclaimer in the documentation
  14      and/or other materials provided with the distribution.
  15
  16  THIS  SOFTWARE  IS  PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  17  AND  ANY  EXPRESS  OR  IMPLIED  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  19  DISCLAIMED.  IN  NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  20  FOR  ANY  DIRECT,  INDIRECT,  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  DAMAGES  (INCLUDING,  BUT  NOT  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  22  SERVICES;  LOSS  OF  USE,  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  23  CAUSED  AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  24  OR  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  25  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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  27 *******************************************************************************/
  28
  29 #ifndef _MOOF_ENGINE_HH_
  30 #define _MOOF_ENGINE_HH_
  31
  32 #include <boost/shared_ptr.hpp>
  33
  34 #include <Moof/Dispatch.hh>
  35 #include <Moof/Video.hh>
  36 #include <Moof/Layer.hh>
  37
  38
  39 namespace Mf {
  40
  41
  42 /**
  43  * The engine is essentially a stack of layers.  While running, it updates each
  44  * layer from the bottom up every timestep.  It also draws each layer from the
  45  * bottom up, adhering to the maximum frame-rate.  Events are send to each layer
  46  * from the top down until a layer signals the event was handled.  The engine is
  47  * also responsible for firing timers on time.  The engine will continue running
  48  * as long as there are layers on the stack.
  49  */
  50
  51 class Engine
  52 {
  53 public:
  54
  55         ~Engine() {}
  56
  57         // get global instance
  58         static Engine& getInstance();
  59
  60         // setting the video is required before you can run the engine and should
  61         // probably be done before adding any layers
  62         void setVideo(VideoP video);
  63         VideoP getVideo() const;
  64
  65         void setTimestep(int ts);
  66         int getTimestep() const;
  67
  68         void setMaxFps(int maxFps);     // draw rate is always capped at the timestep
  69         int getMaxFps() const;
  70
  71         int getFps() const;
  72
  73         void push(LayerP layer);        // push a layer onto the top
  74         LayerP pop();                           // pop the top layer
  75         LayerP pop(Layer* layer);       // pops a specific layer and all layers above it
  76         void clear();                           // remove all layers (the engine will stop)
  77
  78         int getSize() const;            // get the size of the stack
  79
  80         // set this machine in motion
  81         void run();
  82
  83         Dispatch::Handler addHandler(const std::string& event,
  84                         const Dispatch::Function& callback);
  85         Dispatch::Handler addHandler(const std::string& event,
  86                         const Dispatch::Function& callback, Dispatch::Handler handler);
  87
  88         void dispatch(const std::string& event,
  89                         const Dispatch::Message* message = 0);
  90
  91 private:
  92
  93         Engine();               // use getInstance() to access the engine
  94
  95         class Impl;
  96         boost::shared_ptr<Impl> mImpl;
  97 };
  98
  99
 100 } // namespace Mf
 101
 102 #endif // _MOOF_ENGINE_HH_
 103
 104 /** vim: set ts=4 sw=4 tw=80: *************************************************/
 105