oxiphysics-geometry 0.1.2

Geometric shape types for the OxiPhysics engine
Documentation 
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// Copyright 2026 COOLJAPAN OU (Team KitaSan)
// SPDX-License-Identifier: Apache-2.0

//! Internal vector/math helper functions shared across SDF submodules.

#[inline]
pub(super) fn add3(a: [f64; 3], b: [f64; 3]) -> [f64; 3] {
    [a[0] + b[0], a[1] + b[1], a[2] + b[2]]
}

#[inline]
pub(super) fn sub3(a: [f64; 3], b: [f64; 3]) -> [f64; 3] {
    [a[0] - b[0], a[1] - b[1], a[2] - b[2]]
}

#[inline]
pub(super) fn scale3(a: [f64; 3], s: f64) -> [f64; 3] {
    [a[0] * s, a[1] * s, a[2] * s]
}

#[inline]
pub(super) fn dot3(a: [f64; 3], b: [f64; 3]) -> f64 {
    a[0] * b[0] + a[1] * b[1] + a[2] * b[2]
}

#[inline]
pub(super) fn norm3(a: [f64; 3]) -> f64 {
    dot3(a, a).sqrt()
}

#[inline]
pub(super) fn normalize3(a: [f64; 3]) -> [f64; 3] {
    let n = norm3(a).max(1e-30);
    scale3(a, 1.0 / n)
}

#[inline]
pub(super) fn clamp(x: f64, lo: f64, hi: f64) -> f64 {
    x.max(lo).min(hi)
}

#[inline]
pub(super) fn length2(a: [f64; 2]) -> f64 {
    (a[0] * a[0] + a[1] * a[1]).sqrt()
}

// 2D helpers used by cone SDF
#[inline]
pub(super) fn dot2(a: [f64; 2], b: [f64; 2]) -> f64 {
    a[0] * b[0] + a[1] * b[1]
}

#[inline]
pub(super) fn sub2(a: [f64; 2], b: [f64; 2]) -> [f64; 2] {
    [a[0] - b[0], a[1] - b[1]]
}

#[inline]
pub(super) fn scale2(a: [f64; 2], s: f64) -> [f64; 2] {
    [a[0] * s, a[1] * s]
}