drashna/qmk_firmware
1
0
Fork 0
Code Activity Actions

adds multiple voices and the ability to iterate/deiterate between them

Browse source
This commit is contained in:
Jack Humbert 2016-04-21 18:14:25 -04:00
parent a8fd65d86f
commit 9828aba2a1
3 changed files with 53 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

31
quantum/audio/voices.c
View file

@ -1,23 +1,35 @@
#include "voices.h"
// these are imported from audio.c
extern uint16_t envelope_index;
extern float note_timbre;
extern float polyphony_rate;
voice_type voice = default_voice;
voice_type voice = duty_osc;
void set_voice(voice_type v) {
voice = v;
}
void voice_iterate() {
voice = (voice + 1) % number_of_voices;
}
void voice_deiterate() {
voice = (voice - 1) % number_of_voices;
}
float voice_envelope(float frequency) {
// envelope_index ranges from 0 to 0xFFFF, which is preserved at 880.0 Hz
uint16_t compensated_index = (uint16_t)((float)envelope_index * (880.0 / frequency));
switch (voice) {
case default_voice:
// nothing here on purpose
note_timbre = TIMBRE_50;
polyphony_rate = 0;
break;
case butts_fader:
polyphony_rate = 0;
switch (compensated_index) {
case 0 ... 9:
frequency = frequency / 4;
@ -36,6 +48,7 @@ float voice_envelope(float frequency) {
}
break;
case octave_crunch:
polyphony_rate = 0;
switch (compensated_index) {
case 0 ... 9:
case 20 ... 24:
@ -54,6 +67,20 @@ float voice_envelope(float frequency) {
break;
}
break;
case duty_osc:
// This slows the loop down a substantial amount, so higher notes may freeze
polyphony_rate = 0;
switch (compensated_index) {
default:
#define SPEED 10
#define AMP .75
// sine wave is slow
// note_timbre = (sin((float)compensated_index/10000*SPEED) * AMP / 2) + .5;
// triangle wave is a bit faster
note_timbre = (float)abs((compensated_index*SPEED % 3000) - 1500) * ( AMP / 1500 ) + (1 - AMP) / 2;
break;
}
break;
}
return frequency;