Playing with pipeline to display outline

front/src/Phaser/Player/Player.ts

@@ -3,6 +3,7 @@ import {GameScene, Textures} from "../Game/GameScene";
 import {MessageUserPositionInterface, PointInterface} from "../../Connection";
 import {ActiveEventList, UserInputEvent, UserInputManager} from "../UserInput/UserInputManager";
 import {Character} from "../Entity/Character";
+import {OutlinePipeline} from "../Shaders/OutlinePipeline";
 
 
 export const hasMovedEventName = "hasMoved";
@@ -32,6 +33,10 @@ export class Player extends Character implements CurrentGamerInterface {
 
         //the current player model should be push away by other players to prevent conflict
         this.setImmovable(false);
+
+        this.setPipeline(OutlinePipeline.KEY);
+        this.pipeline.setFloat2('uTextureSize',
+            this.texture.getSourceImage().width, this.texture.getSourceImage().height);
     }
 
     moveUser(delta: number): void {

front/src/Phaser/Shaders/OutlinePipeline.ts

@@ -0,0 +1,61 @@
+export class OutlinePipeline extends Phaser.Renderer.WebGL.Pipelines.TextureTintPipeline
+{
+
+    // the unique id of this pipeline
+    public static readonly KEY = 'Outline';
+
+    /**
+     * @param {Phaser.Game} game - the controller of the game instance
+     */
+    constructor(game: Phaser.Game)
+    {
+        super({
+            game: game,
+            renderer: game.renderer,
+            fragShader: `
+        precision mediump float;
+
+        uniform sampler2D uMainSampler;
+        uniform vec2 uTextureSize;
+
+        varying vec2 outTexCoord;
+        varying float outTintEffect;
+        varying vec4 outTint;
+
+        void main(void) 
+        {
+          vec4 texture = texture2D(uMainSampler, outTexCoord);
+          vec4 texel = vec4(outTint.rgb * outTint.a, outTint.a);
+          vec4 color = texture;
+
+          if (outTintEffect == 0.0)
+          {
+            color = texture * texel;
+          }
+          else if (outTintEffect == 1.0)
+          {
+            color.rgb = mix(texture.rgb, outTint.rgb * outTint.a, texture.a);
+            color.a = texture.a * texel.a;
+          }
+          else if (outTintEffect == 2.0)
+          {
+            color = texel;
+          }
+
+          vec2 onePixel = vec2(1.0, 1.0) / uTextureSize;
+          float upAlpha = texture2D(uMainSampler, outTexCoord + vec2(0.0, onePixel.y)).a;
+          float leftAlpha = texture2D(uMainSampler, outTexCoord + vec2(-onePixel.x, 0.0)).a;
+          float downAlpha = texture2D(uMainSampler, outTexCoord + vec2(0.0, -onePixel.y)).a;
+          float rightAlpha = texture2D(uMainSampler, outTexCoord + vec2(onePixel.x, 0.0)).a;
+
+          if (texture.a == 0.0 && max(max(upAlpha, downAlpha), max(leftAlpha, rightAlpha)) == 1.0) 
+          {
+            color = vec4(1.0, 1.0, 1.0, 1.0);
+          }
+
+          gl_FragColor = color;
+        }
+      `
+        });
+    }
+}

front/src/index.ts

@@ -8,6 +8,8 @@ import {gameManager} from "./Phaser/Game/GameManager";
 import {SelectCharacterScene} from "./Phaser/Login/SelectCharacterScene";
 import {EnableCameraScene} from "./Phaser/Login/EnableCameraScene";
 import {FourOFourScene} from "./Phaser/Reconnecting/FourOFourScene";
+import WebGLRenderer = Phaser.Renderer.WebGL.WebGLRenderer;
+import {OutlinePipeline} from "./Phaser/Shaders/OutlinePipeline";
 
 const config: GameConfig = {
     title: "Office game",
@@ -21,6 +23,13 @@ const config: GameConfig = {
         arcade: {
             debug: DEBUG_MODE
         }
+    },
+    callbacks: {
+        postBoot: game => {
+            // FIXME: we should fore WebGL in the config.
+            let renderer = game.renderer as WebGLRenderer;
+            renderer.addPipeline(OutlinePipeline.KEY, new OutlinePipeline(game));
+        }
     }
 };