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Audio example tweaks

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This commit is contained in:
Nikita Lisitsa 2022-10-16 00:22:18 +03:00
parent 81f54d602e
commit 82607781cf
1 changed files with 82 additions and 16 deletions
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98
examples/audio.cpp
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@ -67,6 +67,16 @@ static std::map<SDL_Keycode, int> const key_to_midi
{SDLK_RIGHTBRACKET, 91},
};
static geom::interval<int> const key_rows[3] = {
{59, 68},
{69, 79},
{80, 91},
};
static std::string_view const midi_name[12] = {
"A", "A#", "B", "C", "C#", "D", "D#", "E", "F", "F#", "G", "G#",
};
struct audio_app
: app::app
{
@ -86,12 +96,15 @@ struct audio_app
{
app::app::on_key_down(key);
if (key_to_midi.contains(key) && !channels_.contains(key))
if (key_to_midi.contains(key))
{
int midi = key_to_midi.at(key);
auto tone = audio::karplus_strong(440.f * std::pow(2.f, (midi - 69) / 12.f));
tone = audio::distortion(std::move(tone));
channels_[key] = mixer_->add(audio::fade_in(tone, 0.002f));
if (!channels_.contains(midi))
{
auto tone = audio::karplus_strong(440.f * std::pow(2.f, (midi - 69) / 12.f));
tone = audio::distortion(std::move(tone), 4.f);
channels_[midi] = mixer_->add(audio::fade_in(tone, 0.005f));
}
}
if (key == SDLK_SPACE)
@ -110,12 +123,13 @@ struct audio_app
{
app::app::on_key_up(key);
if (channels_.contains(key))
if (key_to_midi.contains(key))
{
auto & ch = channels_[key];
int midi = key_to_midi.at(key);
auto & ch = channels_[midi];
if (auto s = ch->stream())
ch->stream(audio::fade_out(s, 0.01f));
channels_.erase(key);
ch->stream(audio::fade_out(s, 0.1f));
channels_.erase(midi);
}
if (key == SDLK_KP_PLUS)
@ -127,9 +141,12 @@ struct audio_app
void update() override
{
float const time = clock_.count();
float const dt = clock_.restart().count();
time_ += dt;
float volume = std::sin(time);
smooth_pitch_ += (12.f * std::log2(pitch_control_->pitch()) - smooth_pitch_) * (1.f - std::exp(- 20.f * dt));
float volume = std::sin(time_);
volume_control_->gain_left(0.5f + 0.5f * volume);
volume_control_->gain_right(0.5f - 0.5f * volume);
}
@ -139,12 +156,58 @@ struct audio_app
gl::ClearColor(0.8f, 0.8f, 1.f, 1.f);
gl::Clear(gl::COLOR_BUFFER_BIT);
float size = 64.f;
float margin = 4.f;
float border = 8.f;
float center = width() / 2.f;
float y = height() / 2.f + size * std::size(key_rows) / 2.f;
gfx::painter::text_options opts;
opts.scale = 2.f;
opts.c = {0, 0, 0, 255};
opts.x = gfx::painter::x_align::center;
opts.y = gfx::painter::y_align::center;
for (auto const & row : key_rows)
{
gfx::painter::text_options opts;
opts.x = gfx::painter::x_align::left;
opts.y = gfx::painter::y_align::top;
opts.scale = 2.f;
opts.c = {0, 0, 0, 255};
y -= size;
float x = center - (row.max - row.min + 1) * size / 2.f;
for (int i = 0; i <= row.max - row.min; ++i)
{
gfx::color_rgba color{0, 0, 0, 255};
if (channels_.contains(row.min + i))
color = {255, 127, 0, 255};
painter_.rect({{{x + margin, x + size - margin}, {y + margin, y + size - margin}}}, color);
color = {255, 255, 255, 255};
painter_.rect({{{x + border, x + size - border}, {y + border, y + size - border}}}, color);
painter_.text({x + size / 2.f, y + size / 2.f}, midi_name[(row.min + i + 3) % 12], opts);
x += size;
}
}
opts.scale = 4.f;
opts.c = pause_control_->paused() ? gfx::color_rgba{255, 0, 0, 255} : gfx::color_rgba{0, 127, 0, 255};
painter_.text({width() / 2.f, height() - 200.f}, pause_control_->paused() ? "PAUSED" : "PLAYING", opts);
{
float x = width() - 200.f;
float y = height() / 2.f;
float w = 4.f;
float h = 64.f;
float s = 16.f;
float r = y - h * smooth_pitch_;
painter_.rect({{{x - w, x + w}, {y - h, y + h}}}, {0, 0, 0, 255});
painter_.rect({{{x - s, x + s}, {r - w, r + w}}}, {0, 0, 255, 255});
}
painter_.render(geom::window_camera{width(), height()}.transform());
@ -161,9 +224,12 @@ private:
std::shared_ptr<audio::volume_control_stereo> volume_control_;
std::shared_ptr<audio::pitch_control> pitch_control_;
std::shared_ptr<audio::pause_control> pause_control_;
std::map<SDL_Keycode, audio::channel_ptr> channels_;
std::map<int, audio::channel_ptr> channels_;
float smooth_pitch_ = 0.f;
util::clock<> clock_;
float time_ = 0.f;
gfx::painter painter_;
};