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lighting.ts
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lighting.ts
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import FOV from "./fov/fov.js";
import * as Color from "./color.js";
type LightColor = [number, number, number];
/** Callback to retrieve cell reflectivity (0..1) */
interface ReflectivityCallback { (x:number, y:number ): number };
/** Will be called for every lit cell */
interface LightingCallback { (x:number, y:number, color: LightColor ): void };
interface LightingMap { [key:string]: LightColor };
interface NumberMap { [key:string]: number };
interface Options {
/** Number of passes. 1 equals to simple FOV of all light sources, >1 means a *highly simplified* radiosity-like algorithm. Default = 1 */
passes: number,
/** Cells with emissivity > threshold will be treated as light source in the next pass. Default = 100 */
emissionThreshold: number,
/** Max light range, default = 10 */
range: number
}
/**
* Lighting computation, based on a traditional FOV for multiple light sources and multiple passes.
*/
export default class Lighting {
private _reflectivityCallback: ReflectivityCallback;
private _options!: Options;
private _fov!: FOV;
private _lights: LightingMap;
private _reflectivityCache: NumberMap;
private _fovCache: { [key:string]: NumberMap };
constructor(reflectivityCallback: ReflectivityCallback, options: Partial<Options> = {}) {
this._reflectivityCallback = reflectivityCallback;
this._options = {} as Options;
options = Object.assign({
passes: 1,
emissionThreshold: 100,
range: 10
}, options);
this._lights = {};
this._reflectivityCache = {};
this._fovCache = {};
this.setOptions(options);
}
/**
* Adjust options at runtime
*/
setOptions(options: Partial<Options>) {
Object.assign(this._options, options);
if (options && options.range) { this.reset(); }
return this;
}
/**
* Set the used Field-Of-View algo
*/
setFOV(fov: FOV) {
this._fov = fov;
this._fovCache = {};
return this;
}
/**
* Set (or remove) a light source
*/
setLight(x: number, y: number, color: null | string | LightColor) {
let key = x + "," + y;
if (color) {
this._lights[key] = (typeof(color) == "string" ? Color.fromString(color) as LightColor : color);
} else {
delete this._lights[key];
}
return this;
}
/**
* Remove all light sources
*/
clearLights() { this._lights = {}; }
/**
* Reset the pre-computed topology values. Call whenever the underlying map changes its light-passability.
*/
reset() {
this._reflectivityCache = {};
this._fovCache = {};
return this;
}
/**
* Compute the lighting
*/
compute(lightingCallback: LightingCallback) {
let doneCells: {[key:string]:number} = {};
let emittingCells: LightingMap = {};
let litCells: LightingMap = {};
for (let key in this._lights) { /* prepare emitters for first pass */
let light = this._lights[key];
emittingCells[key] = [0, 0, 0];
Color.add_(emittingCells[key], light);
}
for (let i=0;i<this._options.passes;i++) { /* main loop */
this._emitLight(emittingCells, litCells, doneCells);
if (i+1 == this._options.passes) { continue; } /* not for the last pass */
emittingCells = this._computeEmitters(litCells, doneCells);
}
for (let litKey in litCells) { /* let the user know what and how is lit */
let parts = litKey.split(",");
let x = parseInt(parts[0]);
let y = parseInt(parts[1]);
lightingCallback(x, y, litCells[litKey]);
}
return this;
}
/**
* Compute one iteration from all emitting cells
* @param emittingCells These emit light
* @param litCells Add projected light to these
* @param doneCells These already emitted, forbid them from further calculations
*/
private _emitLight(emittingCells: LightingMap, litCells: LightingMap, doneCells: {[key:string]:number}) {
for (let key in emittingCells) {
let parts = key.split(",");
let x = parseInt(parts[0]);
let y = parseInt(parts[1]);
this._emitLightFromCell(x, y, emittingCells[key], litCells);
doneCells[key] = 1;
}
return this;
}
/**
* Prepare a list of emitters for next pass
*/
private _computeEmitters(litCells: LightingMap, doneCells: {[key:string]:number}) {
let result: LightingMap = {};
for (let key in litCells) {
if (key in doneCells) { continue; } /* already emitted */
let color = litCells[key];
let reflectivity;
if (key in this._reflectivityCache) {
reflectivity = this._reflectivityCache[key];
} else {
let parts = key.split(",");
let x = parseInt(parts[0]);
let y = parseInt(parts[1]);
reflectivity = this._reflectivityCallback(x, y);
this._reflectivityCache[key] = reflectivity;
}
if (reflectivity == 0) { continue; } /* will not reflect at all */
/* compute emission color */
let emission: LightColor = [0, 0, 0];
let intensity = 0;
for (let i=0;i<3;i++) {
let part = Math.round(color[i]*reflectivity);
emission[i] = part;
intensity += part;
}
if (intensity > this._options.emissionThreshold) { result[key] = emission; }
}
return result;
}
/**
* Compute one iteration from one cell
*/
private _emitLightFromCell(x: number, y: number, color: LightColor, litCells: LightingMap) {
let key = x+","+y;
let fov : NumberMap;
if (key in this._fovCache) {
fov = this._fovCache[key];
} else {
fov = this._updateFOV(x, y);
}
for (let fovKey in fov) {
let formFactor = fov[fovKey];
let result : LightColor;
if (fovKey in litCells) { /* already lit */
result = litCells[fovKey];
} else { /* newly lit */
result = [0, 0, 0];
litCells[fovKey] = result;
}
for (let i=0;i<3;i++) { result[i] += Math.round(color[i]*formFactor); } /* add light color */
}
return this;
}
/**
* Compute FOV ("form factor") for a potential light source at [x,y]
*/
private _updateFOV(x: number, y: number) {
let key1 = x+","+y;
let cache: NumberMap = {};
this._fovCache[key1] = cache;
let range = this._options.range;
function cb(x: number, y: number, r: number, vis: number) {
let key2 = x+","+y;
let formFactor = vis * (1-r/range);
if (formFactor == 0) { return; }
cache[key2] = formFactor;
};
this._fov.compute(x, y, range, cb.bind(this));
return cache;
}
}