122 lines
3.2 KiB
C
122 lines
3.2 KiB
C
/*
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* Brickworks
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*
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* Copyright (C) 2023 Orastron Srl unipersonale
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*
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* Brickworks is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3 of the License.
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*
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* Brickworks is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Brickworks. If not, see <http://www.gnu.org/licenses/>.
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*
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* File author: Stefano D'Angelo
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*/
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/*!
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* module_type {{{ utility }}}
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* version {{{ 0.5.0 }}}
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* requires {{{ bw_common bw_config bw_note_queue }}}
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* description {{{
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* Basic voice allocator.
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*
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* ...
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* }}}
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* changelog {{{
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* <ul>
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* <li>Version <strong>0.5.0</strong>:
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* <ul>
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* <li>First release.</li>
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* </ul>
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* </li>
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* </ul>
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* }}}
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*/
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#ifndef _BW_VOICE_ALLOC_H
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#define _BW_VOICE_ALLOC_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <bw_common.h>
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#include <bw_note_queue.h>
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/*! api {{{
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* #### bw_voice_alloc_mode
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* ```>>> */
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typedef enum {
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bw_voice_alloc_mode_low,
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bw_voice_alloc_mode_high
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} bw_voice_alloc_mode;
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/*! <<<```
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* #### bw_voice_alloc_opts
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* ```>>> */
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typedef struct {
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bw_voice_alloc_mode mode;
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void (*note_on)(void *BW_RESTRICT voice, unsigned char note, float velocity);
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void (*note_off)(void *BW_RESTRICT voice, float velocity);
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unsigned char (*get_note)(void *BW_RESTRICT voice);
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char (*is_free)(void *BW_RESTRICT voice);
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} bw_voice_alloc_opts;
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/*! <<<```
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* #### bw_voice_alloc()
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* ```>>> */
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void bw_voice_alloc(const bw_voice_alloc_opts *BW_RESTRICT opts, bw_note_queue *BW_RESTRICT queue, void **BW_RESTRICT voices, int n_voices);
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/*! <<<```
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* }}} */
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/*** Implementation ***/
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/* WARNING: This part of the file is not part of the public API. Its content may
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* change at any time in future versions. Please, do not use it directly. */
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void bw_voice_alloc(const bw_voice_alloc_opts *BW_RESTRICT opts, bw_note_queue *BW_RESTRICT queue, void **BW_RESTRICT voices, int n_voices) {
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for (unsigned char i = 0; i < queue->n_events; i++) {
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bw_note_queue_event *ev = queue->events + i;
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for (int j = 0; j < n_voices; j++)
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if (!opts->is_free(voices[j]) && opts->get_note(voices[j]) == ev->note) {
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if (!ev->status.pressed || ev->went_off)
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opts->note_off(voices[j], ev->status.velocity);
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if (ev->status.pressed)
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opts->note_on(voices[j], ev->note, ev->status.velocity);
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goto next_event;
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}
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if (ev->status.pressed) {
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for (int j = 0; j < n_voices; j++)
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if (opts->is_free(voices[j])) {
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opts->note_on(voices[j], ev->note, ev->status.velocity);
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goto next_event;
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}
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int k = -1;
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int v = ev->note;
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for (int j = 0; j < n_voices; j++) {
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int n = opts->get_note(voices[j]);
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if (opts->mode == bw_voice_alloc_mode_low ? n > v : n < v) {
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v = n;
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k = j;
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}
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}
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if (k >= 0)
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opts->note_on(voices[k], ev->note, ev->status.velocity);
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}
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next_event:;
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}
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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