Add nightfall; disable sound per default

Engine/src/states/Game.ts

@@ -1,5 +1,6 @@
 import { ContextI } from "../ContextI"
 import { segments } from "../shared/segments"
+import { audio, playSong, disableSound, enableSound } from '../shared/audio'
 import { StateI } from "./StateI"
 import * as PIXI from 'pixi.js'
 import * as planck from 'planck'
@@ -12,13 +13,25 @@ import { Entity } from "../live/Entity"
 import { isPlayerEntity, PlayerEntity } from "../live/PlayerEntity"
 import { Action } from "../live/Action"
 
+export interface PIXIMissingColorMatrix extends PIXI.Filter {
+  night(intensity: number, multiply: boolean): void
+  contrast(amount: number, multiply: boolean): void
+  brightness(amount: number, multiply: boolean): void
+  saturate(amount: number, multiply: boolean): void
+  hue(rotation: number, multiply: boolean): void
+  colorTone(desaturation: number, toned: number, lightColor: number, darkColor: number, multiple: boolean): void
+  reset(): void
+}
+
 export interface Layer {
   title: string
   container: PIXI.Container
   decorations: DecorationInstance[]
+  colorMatrix: PIXIMissingColorMatrix
 }
 
 export function GameState(ctx: ContextI): StateI {
+  disableSound()
   let world: planck.World = planck.World({
     gravity: planck.Vec2(0, 0),
   })
@@ -45,7 +58,9 @@ export function GameState(ctx: ContextI): StateI {
         title: l.title,
         container: new PIXI.Container(),
         decorations: [],
+        colorMatrix: new PIXI.filters.ColorMatrixFilter()
       }
+      layer.container.filters = [layer.colorMatrix]
       layer.container.width = w.width
       layer.container.height = w.height
 
@@ -240,6 +255,28 @@ export function GameState(ctx: ContextI): StateI {
     window.removeEventListener('keydown', keydown)
   }
 
+  let nightfall = (b: boolean) => {
+    if (b) {
+      for (let l of layers) {
+        //l.colorMatrix.brightness(0.25, false)
+        l.colorMatrix.night(0.2, true)
+        l.colorMatrix.saturate(-0.75, true)
+        //l.colorMatrix.hue(160, true)
+      }
+      for (let e of entities) {
+      }
+    } else {
+      playSong('GGJ-HappyMusic')
+      for (let l of layers) {
+        l.colorMatrix.reset()
+      }
+      for (let e of entities) {
+      }
+    }
+  }
+
+  nightfall(false)
+
   return {
     enter,
     leave,