aboutsummaryrefslogtreecommitdiffstats
path: root/quantum/audio/voices.c
blob: 8326e91eaaa0a0cd1d512bf98dcad781fdff29c5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
#include "voices.h"
#include "audio.h"
#include "stdlib.h"

// these are imported from audio.c
extern uint16_t envelope_index;
extern float note_timbre;
extern float polyphony_rate;
extern bool glissando;

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) % 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:
            glissando = true;
            note_timbre = TIMBRE_50;
            polyphony_rate = 0;
	        break;

    #ifdef AUDIO_VOICES

        case something:
            glissando = false;
            polyphony_rate = 0;
            switch (compensated_index) {
                case 0 ... 9:
                    note_timbre = TIMBRE_12;
                    break;

                case 10 ... 19:
                    note_timbre = TIMBRE_25;
                    break;

                case 20 ... 200:
                    note_timbre = .125 + .125;
                    break;

                default:
                    note_timbre = .125;
                    break;
            }
            break;

        case drums:
            glissando = false;
            polyphony_rate = 0;
                // switch (compensated_index) {
                //     case 0 ... 10:
                //         note_timbre = 0.5;
                //         break;
                //     case 11 ... 20:
                //         note_timbre = 0.5 * (21 - compensated_index) / 10;
                //         break;
                //     default:
                //         note_timbre = 0;
                //         break;
                // }
                // frequency = (rand() % (int)(frequency * 1.2 - frequency)) + (frequency * 0.8);

            if (frequency < 80.0) {

            } else if (frequency < 160.0) {

                // Bass drum: 60 - 100 Hz
                frequency = (rand() % (int)(40)) + 60;
                switch (envelope_index) {
                    case 0 ... 10:
                        note_timbre = 0.5;
                        break;
                    case 11 ... 20:
                        note_timbre = 0.5 * (21 - envelope_index) / 10;
                        break;
                    default:
                        note_timbre = 0;
                        break;
                }

            } else if (frequency < 320.0) {


                // Snare drum: 1 - 2 KHz
                frequency = (rand() % (int)(1000)) + 1000;
                switch (envelope_index) {
                    case 0 ... 5:
                        note_timbre = 0.5;
                        break;
                    case 6 ... 20:
                        note_timbre = 0.5 * (21 - envelope_index) / 15;
                        break;
                    default:
                        note_timbre = 0;
                        break;
                }

            } else if (frequency < 640.0) {

                // Closed Hi-hat: 3 - 5 KHz
                frequency = (rand() % (int)(2000)) + 3000;
                switch (envelope_index) {
                    case 0 ... 15:
                        note_timbre = 0.5;
                        break;
                    case 16 ... 20:
                        note_timbre = 0.5 * (21 - envelope_index) / 5;
                        break;
                    default:
                        note_timbre = 0;
                        break;
                }

            } else if (frequency < 1280.0) {

                // Open Hi-hat: 3 - 5 KHz
                frequency = (rand() % (int)(2000)) + 3000;
                switch (envelope_index) {
                    case 0 ... 35:
                        note_timbre = 0.5;
                        break;
                    case 36 ... 50:
                        note_timbre = 0.5 * (51 - envelope_index) / 15;
                        break;
                    default:
                        note_timbre = 0;
                        break;
                }

            }
            break;
        case butts_fader:
            glissando = true;
            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
            glissando = true;
            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:
            glissando = true;
            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:
            glissando = true;
            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;

    #endif

		default:
   			break;
    }

    return frequency;
}