src/calf/modmatrix.h

   1 /* Calf DSP Library
   2  * Modulation matrix boilerplate code.
   3  *
   4  * Copyright (C) 2009 Krzysztof Foltman
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General
  17  * Public License along with this program; if not, write to the
  18  * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  19  * Boston, MA 02111-1307, USA.
  20  */
  21 #ifndef __CALF_MODMATRIX_H
  22 #define __CALF_MODMATRIX_H
  23
  24 #include "giface.h"
  25
  26 namespace dsp {
  27
  28 struct modulation_entry
  29 {
  30     int src1, src2;
  31     int mapping;
  32     float amount;
  33     int dest;
  34 };
  35
  36 };
  37
  38 namespace calf_plugins {
  39
  40 class mod_matrix: public table_edit_iface
  41 {
  42 protected:
  43     enum modulation_mode { mod_positive, mod_bipolar, mod_negative, mod_squared, mod_squared_bipolar, mod_antisquared, mod_antisquared_bipolar, mod_parabola, mod_type_count };
  44     /// Polynomials for different scaling modes (1, x, x^2)
  45     static const float scaling_coeffs[mod_type_count][3];
  46     /// Column descriptions for table widget
  47     table_column_info table_columns[6];
  48
  49     dsp::modulation_entry *matrix;
  50     unsigned int matrix_rows;
  51     const char **mod_src_names, **mod_dest_names;
  52
  53     mod_matrix(dsp::modulation_entry *_matrix, unsigned int _rows, const char **_src_names, const char **_dest_names);
  54 public:
  55     virtual const table_column_info *get_table_columns(int param);
  56     virtual uint32_t get_table_rows(int param);
  57     virtual std::string get_cell(int param, int row, int column);
  58     virtual void set_cell(int param, int row, int column, const std::string &src, std::string &error);
  59
  60     /// Process modulation matrix, calculate outputs from inputs
  61     inline void calculate_modmatrix(float *moddest, int moddest_count, float *modsrc)
  62     {
  63         for (int i = 0; i < moddest_count; i++)
  64             moddest[i] = 0;
  65         for (unsigned int i = 0; i < matrix_rows; i++)
  66         {
  67             dsp::modulation_entry &slot = matrix[i];
  68             if (slot.dest) {
  69                 float value = modsrc[slot.src1] * modsrc[slot.src2];
  70                 value = dsp::clip<float>(value, 0, 1);
  71                 const float *c = scaling_coeffs[slot.mapping];
  72                 value = c[0] + c[1] * value + c[2] * value * value;
  73                 moddest[slot.dest] += value * slot.amount;
  74             }
  75         }
  76     }
  77 };
  78
  79 };
  80
  81 #endif