@woosh/meep-engine/src/engine/network/adapters/Vector3InterpolationAdapter.js

Pure JavaScript game engine. Fully featured and production ready.

import { lerp } from "../../../core/math/lerp.js";
import { BinaryInterpolationAdapter } from "../sim/BinaryInterpolationAdapter.js";

/**
 * Componentwise lerp of a 3-Float32 position payload.
 *
 * Wire layout (matching whatever serialization adapter wrote it):
 *   - Float32 x
 *   - Float32 y
 *   - Float32 z
 *
 * 12 bytes per snapshot. Pair with a serialization adapter that uses this
 * same format (the simplest "naked Vector3" encoding).
 *
 * @author Alex Goldring
 * @copyright Company Named Limited (c) 2025
 */
export class Vector3InterpolationAdapter extends BinaryInterpolationAdapter {

    /**
     * @param {BinaryBuffer} out_buffer
     * @param {BinaryBuffer} source
     * @param {number} first_offset
     * @param {number} second_offset
     * @param {number} t
     */
    interpolate(out_buffer, source, first_offset, second_offset, t) {
        source.position = first_offset;
        const ax = source.readFloat32();
        const ay = source.readFloat32();
        const az = source.readFloat32();

        source.position = second_offset;
        const bx = source.readFloat32();
        const by = source.readFloat32();
        const bz = source.readFloat32();

        const out_x = lerp(ax, bx, t);
        const out_y = lerp(ay, by, t);
        const out_z = lerp(az, bz, t);

        out_buffer.writeFloat32(out_x);
        out_buffer.writeFloat32(out_y);
        out_buffer.writeFloat32(out_z);
    }
}