JailDoctor/chirping
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basic song play, better vibrato, copy/paste note

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This commit is contained in:
JailDoctor
2021-09-15 13:58:23 +02:00
parent f5fe2396dd
commit dc9fd548c6
5 changed files with 129 additions and 24 deletions
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8
tonegen.cpp
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@@ -9,7 +9,7 @@ toneGen::toneGen() {
this->note = 34;
this->instrument = CHIPTUNE_INSTRUMENT_NOISE;
this->volume = 15;
this->volume = 0;
this->effect = CHIPTUNE_EFFECT_FADEOUT;
this->current_volume = this->nominal_volume = 1.0f;
@@ -21,6 +21,7 @@ toneGen::toneGen() {
this->old_df = this->df = notes[this->note];
this->f = -AUDIO_FORMAT_MAX_VALUE;
this->vibrato_counter = 0;
}
void toneGen::setNoteLength(const int note_length) {
@@ -30,6 +31,8 @@ void toneGen::setNoteLength(const int note_length) {
void toneGen::setup(const uint8_t note, const uint8_t instrument, const uint8_t volume, const uint8_t effect) {
this->current_pos = 0;
if (note == 0) return;
this->note = note;
this->instrument = instrument;
this->volume = volume;
@@ -52,12 +55,13 @@ const int toneGen::getSamples(const int numSamples, Sint16 *buffer) {
for (int i=0; i<actual_samples_generated;++i) {
f += df;
vibrato_counter += 0.001f;
switch (this->effect) {
case CHIPTUNE_EFFECT_NONE:
break;
case CHIPTUNE_EFFECT_VIBRATO:
f += SDL_sinf((i+this->current_pos)/1000)*15;
f += SDL_sinf(vibrato_counter)*8;
break;
case CHIPTUNE_EFFECT_DROP:
if (((i+this->current_pos)%15)==0 && df != 0) { df--; if (df < 100) this->current_volume = this->nominal_volume*df*0.01f; }