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use tetra::audio::{self, Sound, SoundInstance};
use tetra::graphics::{self, Color, Font, Text};
use tetra::input::{self, Key};
use tetra::math::Vec2;
use tetra::{Context, Settings, State};
const INSTRUCTIONS: &str = "\
Press Space to 'fire and forget' a sound.
There are also three SoundInstances that can be controlled
independently:
| | Play | Pause | Stop | Toggle Repeating |
| Channel 1 | Q | W | E | R |
| Channel 2 | A | S | D | F |
| Channel 3 | Z | X | C | V |
";
struct GameState {
text: Text,
sound: Sound,
channel1: SoundInstance,
channel2: SoundInstance,
channel3: SoundInstance,
}
impl GameState {
fn new(ctx: &mut Context) -> tetra::Result<GameState> {
audio::set_master_volume(ctx, 0.4);
let sound = Sound::new("./examples/resources/powerup.wav")?;
let channel1 = sound.spawn(ctx)?;
let channel2 = sound.spawn(ctx)?;
let channel3 = sound.spawn(ctx)?;
Ok(GameState {
text: Text::new(INSTRUCTIONS, Font::default(), 16.0),
sound,
channel1,
channel2,
channel3,
})
}
}
impl State for GameState {
fn update(&mut self, ctx: &mut Context) -> tetra::Result {
for key in input::get_keys_pressed(ctx) {
match key {
Key::Space => {
self.sound.play(ctx)?;
}
Key::Q => self.channel1.play(),
Key::W => self.channel1.pause(),
Key::E => self.channel1.stop(),
Key::R => self.channel1.toggle_repeating(),
Key::A => self.channel2.play(),
Key::S => self.channel2.pause(),
Key::D => self.channel2.stop(),
Key::F => self.channel1.toggle_repeating(),
Key::Z => self.channel3.play(),
Key::X => self.channel3.pause(),
Key::C => self.channel3.stop(),
Key::V => self.channel1.toggle_repeating(),
_ => {}
}
}
Ok(())
}
fn draw(&mut self, ctx: &mut Context, _dt: f64) -> tetra::Result {
graphics::clear(ctx, Color::rgb(0.392, 0.584, 0.929));
graphics::draw(ctx, &self.text, Vec2::new(16.0, 16.0));
Ok(())
}
}
fn main() {
tetra::run(
&Settings::new("Audio Playback", 640, 480).quit_on_escape(true),
GameState::new,
)
}
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