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-rw-r--r--quantum/audio/voices.c163
1 files changed, 163 insertions, 0 deletions
diff --git a/quantum/audio/voices.c b/quantum/audio/voices.c
new file mode 100644
index 0000000000..0921bd5931
--- /dev/null
+++ b/quantum/audio/voices.c
@@ -0,0 +1,163 @@
+#include "voices.h"
+#include "stdlib.h"
+#include "vibrato_lut.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;
+
+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:
+ note_timbre = TIMBRE_50;
+ polyphony_rate = 0;
+ break;
+
+ case butts_fader:
+ polyphony_rate = 0;
+ switch (compensated_index) {
+ case 0 ... 9:
+ frequency = frequency / 4;
+ note_timbre = TIMBRE_12;
+ break;
+
+ case 10 ... 19:
+ frequency = frequency / 2;
+ note_timbre = TIMBRE_12;
+ break;
+
+ case 20 ... 200:
+ note_timbre = .125 - pow(((float)compensated_index - 20) / (200 - 20), 2)*.125;
+ break;
+
+ default:
+ note_timbre = 0;
+ break;
+ }
+ break;
+
+ case octave_crunch:
+ polyphony_rate = 0;
+ switch (compensated_index) {
+ case 0 ... 9:
+ case 20 ... 24:
+ case 30 ... 32:
+ frequency = frequency / 2;
+ note_timbre = TIMBRE_12;
+ break;
+
+ case 10 ... 19:
+ case 25 ... 29:
+ case 33 ... 35:
+ frequency = frequency * 2;
+ note_timbre = TIMBRE_12;
+ break;
+
+ default:
+ note_timbre = TIMBRE_12;
+ 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 OCS_SPEED 10
+ #define OCS_AMP .25
+ // sine wave is slow
+ // note_timbre = (sin((float)compensated_index/10000*OCS_SPEED) * OCS_AMP / 2) + .5;
+ // triangle wave is a bit faster
+ note_timbre = (float)abs((compensated_index*OCS_SPEED % 3000) - 1500) * ( OCS_AMP / 1500 ) + (1 - OCS_AMP) / 2;
+ break;
+ }
+ break;
+
+ case duty_octave_down:
+ polyphony_rate = 0;
+ note_timbre = (envelope_index % 2) * .125 + .375 * 2;
+ if ((envelope_index % 4) == 0)
+ note_timbre = 0.5;
+ if ((envelope_index % 8) == 0)
+ note_timbre = 0;
+ break;
+ case delayed_vibrato:
+ polyphony_rate = 0;
+ note_timbre = TIMBRE_50;
+ #define VOICE_VIBRATO_DELAY 150
+ #define VOICE_VIBRATO_SPEED 50
+ switch (compensated_index) {
+ case 0 ... VOICE_VIBRATO_DELAY:
+ break;
+ default:
+ frequency = frequency * VIBRATO_LUT[(int)fmod((((float)compensated_index - (VOICE_VIBRATO_DELAY + 1))/1000*VOICE_VIBRATO_SPEED), VIBRATO_LUT_LENGTH)];
+ break;
+ }
+ break;
+ // case delayed_vibrato_octave:
+ // polyphony_rate = 0;
+ // if ((envelope_index % 2) == 1) {
+ // note_timbre = 0.55;
+ // } else {
+ // note_timbre = 0.45;
+ // }
+ // #define VOICE_VIBRATO_DELAY 150
+ // #define VOICE_VIBRATO_SPEED 50
+ // switch (compensated_index) {
+ // case 0 ... VOICE_VIBRATO_DELAY:
+ // break;
+ // default:
+ // frequency = frequency * VIBRATO_LUT[(int)fmod((((float)compensated_index - (VOICE_VIBRATO_DELAY + 1))/1000*VOICE_VIBRATO_SPEED), VIBRATO_LUT_LENGTH)];
+ // break;
+ // }
+ // break;
+ // case duty_fifth_down:
+ // note_timbre = 0.5;
+ // if ((envelope_index % 3) == 0)
+ // note_timbre = 0.75;
+ // break;
+ // case duty_fourth_down:
+ // note_timbre = 0.0;
+ // if ((envelope_index % 12) == 0)
+ // note_timbre = 0.75;
+ // if (((envelope_index % 12) % 4) != 1)
+ // note_timbre = 0.75;
+ // break;
+ // case duty_third_down:
+ // note_timbre = 0.5;
+ // if ((envelope_index % 5) == 0)
+ // note_timbre = 0.75;
+ // break;
+ // case duty_fifth_third_down:
+ // note_timbre = 0.5;
+ // if ((envelope_index % 5) == 0)
+ // note_timbre = 0.75;
+ // if ((envelope_index % 3) == 0)
+ // note_timbre = 0.25;
+ // break;
+
+ default:
+ break;
+ }
+
+ return frequency;
+} \ No newline at end of file