@woosh/meep-engine/src/core/geom/3d/frustum/frustum_matrix4_project.js

Pure JavaScript game engine. Fully featured and production ready.

import { assert } from "../../../assert.js";
import { plane3_matrix4_project } from "../plane/plane3_matrix4_project.js";

/**
 * Perform affine transform on a given frustum
 * @param {number[]|Float32Array|Float64Array} output
 * @param {number} output_offset
 * @param {number[]|Float32Array|Float64Array} input
 * @param {number} input_offset
 * @param {number[]|Float32Array|Float64Array} matrix4
 */
export function frustum_matrix4_project(
    output, output_offset,
    input, input_offset,
    matrix4
) {
    assert.isArrayLike(output, 'output');
    assert.isNonNegativeInteger(output_offset, "output_offset");

    assert.isArrayLike(input, 'input');
    assert.greaterThanOrEqual(input.length, input_offset + 24, 'input too small');
    assert.isNonNegativeInteger(input_offset, "input_offset");
    
    assert.isArrayLike(matrix4, 'matrix4');

    for (let plane_index = 0; plane_index < 6; plane_index++) {
        const frustum_offset = plane_index * 4;

        const i = input_offset + frustum_offset;
        const o = output_offset + frustum_offset;

        plane3_matrix4_project(
            output, o,
            matrix4,
            input[i],
            input[i + 1],
            input[i + 2],
            input[i + 3],
        );

    }

}