playcanvas/build/playcanvas.dbg/src/framework/lightmapper/bake-light-simple.js

PlayCanvas WebGL game engine

import { Vec2 } from '../../core/math/vec2.js';
import { random } from '../../core/math/random.js';
import { LIGHTTYPE_DIRECTIONAL } from '../../scene/constants.js';
import { BakeLight } from './bake-light.js';

const _tempPoint = new Vec2();
// a bake light representing a directional, omni or spot type of light
class BakeLightSimple extends BakeLight {
    constructor(lightmapper, light){
        super(lightmapper.scene, light, lightmapper.lightingParams);
    }
    get numVirtualLights() {
        // only directional lights support multiple samples
        if (this.light.type === LIGHTTYPE_DIRECTIONAL) {
            return this.light.bakeNumSamples;
        }
        return 1;
    }
    prepareVirtualLight(index, numVirtualLights) {
        // set to original rotation
        const light = this.light;
        light._node.setLocalRotation(this.rotation);
        // random adjustment to the directional light facing
        if (index > 0) {
            const directionalSpreadAngle = light.bakeArea;
            random.circlePointDeterministic(_tempPoint, index, numVirtualLights);
            _tempPoint.mulScalar(directionalSpreadAngle * 0.5);
            light._node.rotateLocal(_tempPoint.x, 0, _tempPoint.y);
        }
        // update transform
        light._node.getWorldTransform();
        // divide intensity by number of virtual lights (in linear space)
        const gamma = 2.2;
        const linearIntensity = Math.pow(this.intensity, gamma);
        light.intensity = Math.pow(linearIntensity / numVirtualLights, 1 / gamma);
    }
}

export { BakeLightSimple };