@animech-public/playcanvas/build/playcanvas.prf/src/scene/graphics/light-cube.js

PlayCanvas WebGL game engine

import { Vec3 } from '../../core/math/vec3.js';
import { LIGHTTYPE_DIRECTIONAL } from '../constants.js';

const lightCubeDir = [new Vec3(-1, 0, 0), new Vec3(1, 0, 0), new Vec3(0, -1, 0), new Vec3(0, 1, 0), new Vec3(0, 0, -1), new Vec3(0, 0, 1)];
class LightCube {
	constructor() {
		this.colors = new Float32Array(6 * 3);
	}
	update(ambientLight, lights) {
		const colors = this.colors;
		const {
			r,
			g,
			b
		} = ambientLight;
		for (let j = 0; j < 6; j++) {
			colors[j * 3] = r;
			colors[j * 3 + 1] = g;
			colors[j * 3 + 2] = b;
		}
		for (let j = 0; j < lights.length; j++) {
			const light = lights[j];
			if (light._type === LIGHTTYPE_DIRECTIONAL) {
				for (let c = 0; c < 6; c++) {
					const weight = Math.max(lightCubeDir[c].dot(light._direction), 0) * light._intensity;
					const lightColor = light._color;
					colors[c * 3] += lightColor.r * weight;
					colors[c * 3 + 1] += lightColor.g * weight;
					colors[c * 3 + 2] += lightColor.b * weight;
				}
			}
		}
	}
}

export { LightCube };