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Copy pathmidi.rs
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182 lines (162 loc) · 5.14 KB
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use bevy::color::{Color, ColorToComponents};
use processing::prelude::*;
use processing_glfw::GlfwContext;
use processing_render::render::command::DrawCommand;
const PENTATONIC: [u8; 5] = [0, 3, 5, 7, 10];
const ROOT: u8 = 48;
const OCTAVES: u8 = 3;
const WIDTH: u32 = 640;
const HEIGHT: u32 = 400;
fn note_at_x(x: f32) -> u8 {
let steps = (PENTATONIC.len() as u8) * OCTAVES;
let t = (x / WIDTH as f32).clamp(0.0, 0.999);
let idx = (t * steps as f32) as u8;
let octave = idx / PENTATONIC.len() as u8;
let degree = (idx % PENTATONIC.len() as u8) as usize;
ROOT + octave * 12 + PENTATONIC[degree]
}
fn velocity_at_y(y: f32) -> u8 {
let t = 1.0 - (y / HEIGHT as f32).clamp(0.0, 1.0);
(16.0 + t * 110.0) as u8
}
fn note_color(note: u8) -> Color {
let hue = ((note - ROOT) as f32 / 12.0).fract() * 360.0;
Color::hsv(hue, 0.7, 0.95)
}
struct Ripple {
x: f32,
y: f32,
age: f32,
color: Color,
}
fn main() {
if let Err(e) = sketch() {
eprintln!("Sketch error: {e:?}");
exit(1).unwrap();
}
exit(0).unwrap();
}
fn sketch() -> error::Result<()> {
let mut glfw_ctx = GlfwContext::new(WIDTH, HEIGHT, false)?;
init(Config::default())?;
let surface = glfw_ctx.create_surface(WIDTH, HEIGHT, false)?;
let graphics = graphics_create(surface, WIDTH, HEIGHT, TextureFormat::Rgba16Float)?;
midi_refresh_ports()?;
let ports = midi_list_ports()?;
if ports.is_empty() {
eprintln!("no MIDI output ports found — connect a synth or virtual port and retry");
return Ok(());
}
for p in &ports {
println!("{p}");
}
midi_connect(0)?;
let mut held: Option<u8> = None;
let mut ripples: Vec<Ripple> = Vec::new();
while glfw_ctx.poll_events() {
graphics_begin_draw(graphics)?;
let mx = input_mouse_x(surface)?;
let my = input_mouse_y(surface)?;
let pressed = input_mouse_is_pressed()?;
match (pressed, held) {
(true, None) => {
let note = note_at_x(mx);
let velocity = velocity_at_y(my);
midi_note_on(note, velocity)?;
ripples.push(Ripple {
x: mx,
y: my,
age: 0.0,
color: note_color(note),
});
held = Some(note);
}
(true, Some(note)) => {
let target = note_at_x(mx);
if target != note {
midi_note_off(note)?;
let velocity = velocity_at_y(my);
midi_note_on(target, velocity)?;
ripples.push(Ripple {
x: mx,
y: my,
age: 0.0,
color: note_color(target),
});
held = Some(target);
}
}
(false, Some(note)) => {
midi_note_off(note)?;
held = None;
}
_ => {}
}
graphics_record_command(
graphics,
DrawCommand::BackgroundColor(Color::srgb(0.04, 0.04, 0.07)),
)?;
let octave_w = WIDTH as f32 / OCTAVES as f32;
for i in 0..OCTAVES {
let alpha = if i % 2 == 0 { 0.04 } else { 0.0 };
graphics_record_command(
graphics,
DrawCommand::Fill(Color::srgba(1.0, 1.0, 1.0, alpha)),
)?;
graphics_record_command(
graphics,
DrawCommand::Rect {
x: i as f32 * octave_w,
y: 0.0,
w: octave_w,
h: HEIGHT as f32,
radii: [0.0; 4],
},
)?;
}
ripples.retain_mut(|r| {
r.age += 0.022;
r.age < 1.0
});
for r in &ripples {
let size = 24.0 + r.age * 220.0;
let alpha = (1.0 - r.age).powi(2);
let lin = r.color.to_linear().to_f32_array();
graphics_record_command(
graphics,
DrawCommand::Fill(Color::linear_rgba(lin[0], lin[1], lin[2], alpha)),
)?;
graphics_record_command(
graphics,
DrawCommand::Rect {
x: r.x - size / 2.0,
y: r.y - size / 2.0,
w: size,
h: size,
radii: [size / 2.0; 4],
},
)?;
}
let preview = note_color(note_at_x(mx));
graphics_record_command(graphics, DrawCommand::Fill(preview))?;
graphics_record_command(
graphics,
DrawCommand::Rect {
x: mx - 8.0,
y: my - 8.0,
w: 16.0,
h: 16.0,
radii: [8.0; 4],
},
)?;
graphics_end_draw(graphics)?;
if input_key_is_pressed()? && input_key_is_down(KeyCode::Escape)? {
break;
}
}
if let Some(note) = held {
midi_note_off(note)?;
}
midi_disconnect()?;
Ok(())
}