src/Output/DSSIControl.h

   1 /*
   2   ZynAddSubFX - a software synthesizer
   3
   4   DSSIControl.h - DSSI control ports "controller"
   5   Copyright (C) 2015 Olivier Jolly
   6   Author: Olivier Jolly
   7
   8   This program is free software; you can redistribute it and/or
   9   modify it under the terms of the GNU General Public License
  10   as published by the Free Software Foundation; either version 2
  11   of the License, or (at your option) any later version.
  12 */
  13
  14 #ifndef ZYNADDSUBFX_DSSICONTROL_H
  15 #define ZYNADDSUBFX_DSSICONTROL_H
  16
  17
  18 #include "DSSIControlDescription.h"
  19
  20 struct DSSIControl {
  21
  22     DSSIControlDescription description;
  23
  24     float *data; /// pointer to the value for this controller which is updated by the DSSI host
  25
  26     /**
  27      * Ctr for a DSSIControl based on a DSSIControl description
  28      * @param controller_code the controller code
  29      * @param name the human readable code name
  30      */
  31     DSSIControl(DSSIControlDescription description) : description(description) { }
  32
  33     /**
  34      * update the current control to the Master in charge of dispatching them to the parts, effects, ...
  35      * @param master the controller master in charge of further dispatch
  36      */
  37     void forward_control(zyn::Master *master);
  38
  39     /**
  40      * scale the incoming value refereced by data in the hinted range to one expected by the Master dispatcher.
  41      * Boolean are toggled to 0 or 127, ...
  42      */
  43     int get_scaled_data() {
  44         if (LADSPA_IS_HINT_TOGGLED(description.port_range_hint.HintDescriptor)) {
  45             return *data <= 0 ? 0 : 127;
  46         } else if (description.port_range_hint.UpperBound < 127) {
  47             // when not using 127 or 128 as upper bound, scale the input using the port range hint to 0 .. 128
  48             return 128 * (*data - description.port_range_hint.LowerBound) /
  49                    (description.port_range_hint.UpperBound - description.port_range_hint.LowerBound);
  50         } else {
  51             return *data;
  52         }
  53     }
  54
  55 };
  56
  57 #endif //ZYNADDSUBFX_DSSICONTROL_H