alex/beta-minecraft-rust

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use glam::DVec3;

use crate::math::{cos, sin};

pub const REACH: f64 = 4.0;
pub const OFFSETS: [[i32; 3]; 6] = [
    [0, -1, 0],
    [0, 1, 0],
    [0, 0, -1],
    [0, 0, 1],
    [-1, 0, 0],
    [1, 0, 0],
];

pub fn adjacent([x, y, z]: [i32; 3], side: u8) -> Option<[i32; 3]> {
    let &[dx, dy, dz] = OFFSETS.get(usize::from(side))?;
    Some([x.checked_add(dx)?, y.checked_add(dy)?, z.checked_add(dz)?])
}

pub fn look(yaw: f32, pitch: f32) -> DVec3 {
    let yaw = -yaw * std::f32::consts::PI / 180.0 - std::f32::consts::PI;
    let pitch = -pitch * std::f32::consts::PI / 180.0;
    let horizontal = -cos(pitch);
    DVec3::new(
        f64::from(sin(yaw) * horizontal),
        f64::from(sin(pitch)),
        f64::from(cos(yaw) * horizontal),
    )
}