interpreter/preprocessor/faust-0.9.47mr3/architecture/osclib/faust/src/nodes/FaustNode.h

   1 /*
   2
   3   Copyright (C) 2011 Grame
   4
   5   This library is free software; you can redistribute it and/or
   6   modify it under the terms of the GNU Lesser General Public
   7   License as published by the Free Software Foundation; either
   8   version 2.1 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   Lesser General Public License for more details.
  14
  15   You should have received a copy of the GNU Lesser General Public
  16   License along with this library; if not, write to the Free Software
  17   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  18
  19   Grame Research Laboratory, 9 rue du Garet, 69001 Lyon - France
  20   research@grame.fr
  21
  22 */
  23
  24
  25 #ifndef __FaustNode__
  26 #define __FaustNode__
  27
  28 #include <string>
  29 #include <vector>
  30
  31 #include "MessageDriven.h"
  32
  33 namespace oscfaust
  34 {
  35
  36 class FaustNode;
  37 typedef class SMARTP<FaustNode> SFaustNode;
  38
  39 /**
  40  * map (rescale) input values to output values
  41  */
  42 struct mapping
  43 {
  44         const float fMinIn;
  45         const float fMaxIn;
  46         const float fMinOut;
  47         const float fMaxOut;
  48         const float fScale;
  49
  50         mapping(float imin, float imax, float omin, float omax) : fMinIn(imin), fMaxIn(imax),
  51                                                                                         fMinOut(omin), fMaxOut(omax),
  52                                                                                         fScale( (fMaxOut-fMinOut)/(fMaxIn-fMinIn) ) {}
  53         float scale (float x) { float z = (x < fMinIn) ? fMinIn : (x > fMaxIn) ? fMaxIn : x; return fMinOut + (z - fMinIn) * fScale; }
  54 };
  55
  56
  57 //--------------------------------------------------------------------------
  58 /*!
  59         \brief a faust node is a terminal node and represents a faust parameter controler
  60 */
  61 class FaustNode : public MessageDriven
  62 {
  63         float * fZone;                  // the parameter memory zone
  64         mapping fMapping;
  65
  66         bool store (float val);
  67
  68         protected:
  69                 FaustNode(const char *name, float* zone, float init, float min, float max, const char* prefix)
  70                         : MessageDriven (name, prefix), fZone(zone), fMapping(min, max, min, max)
  71                         { *zone = init; }
  72
  73                 FaustNode(const char *name, float* zone,  float imin, float imax, float init, float min, float max, const char* prefix)
  74                         : MessageDriven (name, prefix), fZone(zone), fMapping(imin, imax, min, max)
  75                         { *zone = init; }
  76                 virtual ~FaustNode() {}
  77
  78         public:
  79                 static SFaustNode create (const char* name, float* zone, float init, float min, float max, const char* prefix)
  80                                                         { return new FaustNode(name, zone, init, min, max, prefix); }
  81                 static SFaustNode create (const char* name, float* zone, float imin, float imax, float init, float min, float max, const char* prefix)
  82                                                         { return new FaustNode(name, zone, imin, imax, init, min, max, prefix); }
  83
  84
  85                 virtual bool    accept( const Message* msg );                   ///< handler for the 'accept' message
  86                 virtual void    get (unsigned long ipdest) const;               ///< handler for the 'get' message
  87 };
  88
  89 } // end namespoace
  90
  91 #endif