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Piano: Add attack

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This commit is contained in:
William McPherson 2020-02-05 15:13:04 +11:00 • committed by Andreas Kling
parent 5990b3b2e6
commit ab9475a3f3
6 changed files with 62 additions and 10 deletions
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38
Applications/Piano/AudioEngine.cpp
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@ -32,6 +32,7 @@
AudioEngine::AudioEngine()
{
set_sustain_impl(0);
set_attack(0);
set_decay(0);
}
@ -45,12 +46,26 @@ void AudioEngine::fill_buffer(FixedArray<Sample>& buffer)
for (size_t i = 0; i < buffer.size(); ++i) {
for (size_t note = 0; note < note_count; ++note) {
if (!m_note_on[note])
switch (m_envelope[note]) {
case Done:
continue;
m_power[note] -= m_decay_step;
if (m_power[note] < m_sustain_level)
m_power[note] = m_sustain_level;
case Attack:
m_power[note] += m_attack_step;
if (m_power[note] >= 1) {
m_power[note] = 1;
m_envelope[note] = Decay;
}
break;
case Decay:
m_power[note] -= m_decay_step;
if (m_power[note] < m_sustain_level)
m_power[note] = m_sustain_level;
break;
case Release:
break;
default:
ASSERT_NOT_REACHED();
}
double val = 0;
switch (m_wave) {
@ -150,13 +165,15 @@ void AudioEngine::set_note(int note, Switch switch_note)
if (switch_note == On) {
if (m_note_on[note] == 0) {
m_pos[note] = 0;
m_power[note] = 1;
m_envelope[note] = Attack;
}
++m_note_on[note];
} else {
if (m_note_on[note] >= 1) {
if (m_note_on[note] == 1)
if (m_note_on[note] == 1) {
m_power[note] = 0;
m_envelope[note] = Done;
}
--m_note_on[note];
}
}
@ -209,6 +226,13 @@ static inline double calculate_step(double distance, int milliseconds)
return step;
}
void AudioEngine::set_attack(int attack)
{
ASSERT(attack >= 0);
m_attack = attack;
m_attack_step = calculate_step(1, m_attack);
}
void AudioEngine::set_decay(int decay)
{
ASSERT(decay >= 0);