import {Vec4} from "./math.js";

export function vec4_set(out: Vec4, x: number, y: number, z: number, w: number) {
    out[0] = x;
    out[1] = y;
    out[2] = z;
    out[3] = w;
    return out;
}

export function vec4_copy(out: Vec4, a: Vec4) {
    out[0] = a[0];
    out[1] = a[1];
    out[2] = a[2];
    out[3] = a[3];
    return out;
}

export function vec4_add(out: Vec4, a: Vec4, b: Vec4) {
    out[0] = a[0] + b[0];
    out[1] = a[1] + b[1];
    out[2] = a[2] + b[2];
    out[3] = a[3] + b[3];
    return out;
}

export function vec4_subtract(out: Vec4, a: Vec4, b: Vec4) {
    out[0] = a[0] - b[0];
    out[1] = a[1] - b[1];
    out[2] = a[2] - b[2];
    out[3] = a[3] - b[3];
    return out;
}

export function vec4_scale(out: Vec4, a: Vec4, b: number) {
    out[0] = a[0] * b;
    out[1] = a[1] * b;
    out[2] = a[2] * b;
    out[3] = a[3] * b;
    return out;
}

export function vec4_lerp(out: Vec4, a: Vec4, b: Vec4, t: number) {
    let ax = a[0];
    let ay = a[1];
    let az = a[2];
    let aw = a[3];
    out[0] = ax + t * (b[0] - ax);
    out[1] = ay + t * (b[1] - ay);
    out[2] = az + t * (b[2] - az);
    out[3] = aw + t * (b[3] - aw);
    return out;
}