klangfarbrs/src/lib.rs


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// use gdnative::api::Resource;
use gdnative::prelude::*;

#[derive(NativeClass)]
#[inherit(Node)]
pub struct MonoBuffer {
    frames: [f32; 512]
}

pub fn fill_frames() -> [f32; 512] {
    let tau = std::f32::consts::FRAC_PI_2;
    let frequency = 440.0;
    let sample_rate = 8000.0;
    let mut frames = [0.0; 512];

    for i in 0..512 {
        frames[i] = f32::sin(tau * frequency * i as f32/sample_rate);
    }

    return frames
}

#[methods]
impl MonoBuffer {
    fn new(_owner: &Node) -> Self {
        MonoBuffer { frames: fill_frames() }
    }

    fn frames(&self) -> [f32; 512] {
        return self.frames;
    }

    #[export]
    fn _ready(&self, _owner: &Node) {
        godot_print!("Whatever, connected.")
    }
}

// Function that registers all exposed classes to Godot
fn init(handle: InitHandle) {
    // Register the `MonoBuffer` type we declared.
    handle.add_class::<MonoBuffer>();
}

// Macro that creates the entry-points of the dynamic library.
godot_init!(init);