Enhancement: Tunnel Vision

README.md

@@ -62,6 +62,7 @@ This will allow the CSP checks to pass that are served up by Reticulum so you ca
 - `disable_telemetry` - If `true` disables Sentry telemetry.
 - `log_filter` - A `debug` style filter for setting the logging level.
 - `debug` - If `true` performs verbose logging of Janus and NAF traffic.
+- `disableTunnel` - Tunnel vision is on by default. Disable the tunnel vision by this parameter.
 
 ## Additional Resources
 

src/hub.js

@@ -134,6 +134,7 @@ import "./components/cardboard-controls";
 import "./components/cursor-controller";
 
 import "./components/nav-mesh-helper";
+import "./systems/tunnel-effect";
 
 import "./components/tools/pen";
 import "./components/tools/networked-drawing";

src/systems/tunnel-effect.js

@@ -0,0 +1,163 @@
+import "../utils/postprocessing/EffectComposer";
+import "../utils/postprocessing/RenderPass";
+import "../utils/postprocessing/ShaderPass";
+import "../utils/postprocessing/MaskPass";
+import "../utils/shaders/CopyShader";
+import "../utils/shaders/VignetteShader";
+import qsTruthy from "../utils/qs_truthy";
+
+const disabledByQueryString = qsTruthy("disableTunnel");
+const CLAMP_SPEED = 0.01;
+const CLAMP_RADIUS = 0.001;
+const NO_TUNNEL_RADIUS = 10.0;
+const NO_TUNNEL_SOFTNESS = 0.0;
+
+function lerp(start, end, t) {
+  return (1 - t) * start + t * end;
+}
+
+function f(t) {
+  const x = t - 1;
+  return 1 + x * x * x * x * x;
+}
+
+AFRAME.registerSystem("tunneleffect", {
+  schema: {
+    targetComponent: { type: "string", default: "character-controller" },
+    radius: { type: "number", default: 1.0, min: 0.25 },
+    minRadius: { type: "number", default: 0.25, min: 0.1 },
+    maxSpeed: { type: "number", default: 0.5, min: 0.1 },
+    softest: { type: "number", default: 0.1, min: 0.0 },
+    opacity: { type: "number", default: 1, min: 0.0 }
+  },
+
+  init: function() {
+    this.scene = this.el;
+    this.isMoving = false;
+    this.isVR = false;
+    this.dt = 0;
+    this.isPostProcessingReady = false;
+    this.characterEl = document.querySelector(`a-entity[${this.data.targetComponent}]`);
+    if (this.characterEl) {
+      this._initPostProcessing = this._initPostProcessing.bind(this);
+      this.characterEl.addEventListener("componentinitialized", this._initPostProcessing);
+    } else {
+      console.warn("Could not find target component.");
+    }
+    this._enterVR = this._enterVR.bind(this);
+    this._exitVR = this._exitVR.bind(this);
+    this.scene.addEventListener("enter-vr", this._enterVR);
+    this.scene.addEventListener("exit-vr", this._exitVR);
+  },
+
+  pause: function() {
+    if (!this.characterEl) {
+      return;
+    }
+    this.characterEl.removeEventListener("componentinitialized", this._initPostProcessing);
+    this.scene.removeEventListener("enter-vr", this._enterVR);
+    this.scene.removeEventListener("exit-vr", this._exitVR);
+  },
+
+  play: function() {
+    this.scene.addEventListener("enter-vr", this._enterVR);
+    this.scene.addEventListener("exit-vr", this._exitVR);
+  },
+
+  tick: function(t, dt) {
+    this.dt = dt;
+
+    if (disabledByQueryString || !this.isPostProcessingReady || !this.isVR) {
+      return;
+    }
+
+    const { maxSpeed, minRadius, softest } = this.data;
+    const characterSpeed = this.characterComponent.velocity.length();
+    const shaderRadius = this.vignettePass.uniforms["radius"].value || NO_TUNNEL_RADIUS;
+    if (!this.enabled && characterSpeed > CLAMP_SPEED) {
+      this.enabled = true;
+      this._bindRenderFunc();
+    } else if (
+      this.enabled &&
+      characterSpeed < CLAMP_SPEED &&
+      Math.abs(NO_TUNNEL_RADIUS - shaderRadius) < CLAMP_RADIUS
+    ) {
+      this.enabled = false;
+      this._exitTunnel();
+    }
+    if (this.enabled) {
+      const clampedSpeed = characterSpeed > maxSpeed ? maxSpeed : characterSpeed;
+      const speedRatio = clampedSpeed / maxSpeed;
+      this.targetRadius = lerp(NO_TUNNEL_RADIUS, minRadius, f(speedRatio));
+      this.targetSoftness = lerp(NO_TUNNEL_SOFTNESS, softest, f(speedRatio));
+      this._updateVignettePass(this.targetRadius, this.targetSoftness, this.data.opacity);
+    }
+  },
+
+  _exitTunnel: function() {
+    this.scene.renderer.render = this.originalRenderFunc;
+    this.isMoving = false;
+  },
+
+  _initPostProcessing: function(event) {
+    if (event.detail.name === this.data.targetComponent) {
+      this.characterEl.removeEventListener("componentinitialized", this._initPostProcessing);
+      this.characterComponent = this.characterEl.components[this.data.targetComponent];
+      this._initComposer();
+    }
+  },
+
+  _enterVR: function() {
+    this.isVR = true; //TODO: This is called in 2D mode when you press "f", which is bad
+  },
+
+  _exitVR: function() {
+    this._exitTunnel();
+    this.isVR = false;
+  },
+
+  _initComposer: function() {
+    this.renderer = this.scene.renderer;
+    this.camera = this.scene.camera;
+    this.originalRenderFunc = this.scene.renderer.render;
+    this.isDigest = false;
+    const render = this.scene.renderer.render;
+    const system = this;
+    this.postProcessingRenderFunc = function() {
+      if (system.isDigest) {
+        render.apply(this, arguments);
+      } else {
+        system.isDigest = true;
+        system.composer.render(system.dt);
+        system.isDigest = false;
+      }
+    };
+    this.composer = new THREE.EffectComposer(this.renderer);
+    this.composer.resize();
+    this.scenePass = new THREE.RenderPass(this.scene.object3D, this.camera);
+    this.vignettePass = new THREE.ShaderPass(THREE.VignetteShader);
+    this._updateVignettePass(this.data.radius, this.data.softness, this.data.opacity);
+    this.composer.addPass(this.scenePass);
+    this.composer.addPass(this.vignettePass);
+    this.isPostProcessingReady = true;
+  },
+
+  _updateVignettePass: function(radius, softness, opacity) {
+    const { width, height } = this.renderer.getSize();
+    const pixelRatio = this.renderer.getPixelRatio();
+    this.vignettePass.uniforms["radius"].value = radius;
+    this.vignettePass.uniforms["softness"].value = softness;
+    this.vignettePass.uniforms["opacity"].value = opacity;
+    this.vignettePass["resolution"] = new THREE.Uniform(new THREE.Vector2(width * pixelRatio, height * pixelRatio));
+    if (!this.vignettePass.renderToScreen) {
+      this.vignettePass.renderToScreen = true;
+    }
+  },
+
+  /**
+   * use the render func of the effect composer when we need the postprocessing
+   */
+  _bindRenderFunc: function() {
+    this.scene.renderer.render = this.postProcessingRenderFunc;
+  }
+});

src/utils/postprocessing/EffectComposer.js

@@ -0,0 +1,167 @@
+THREE.EffectComposer = function(renderer, renderTarget) {
+  this.renderer = renderer;
+  this.delta = 0;
+  window.addEventListener("vrdisplaypresentchange", this.resize.bind(this));
+
+  if (renderTarget === undefined) {
+    const parameters = {
+      minFilter: THREE.LinearFilter,
+      magFilter: THREE.LinearFilter,
+      format: THREE.RGBAFormat,
+      stencilBuffer: false
+    };
+
+    const size = renderer.getDrawingBufferSize();
+    renderTarget = new THREE.WebGLRenderTarget(size.width, size.height, parameters);
+    renderTarget.texture.name = "EffectComposer.rt1";
+  }
+
+  this.renderTarget1 = renderTarget;
+  this.renderTarget2 = renderTarget.clone();
+  this.renderTarget2.texture.name = "EffectComposer.rt2";
+
+  this.writeBuffer = this.renderTarget1;
+  this.readBuffer = this.renderTarget2;
+
+  this.passes = [];
+  this.maskActive = false;
+
+  // dependencies
+
+  if (THREE.CopyShader === undefined) {
+    console.error("THREE.EffectComposer relies on THREE.CopyShader");
+  }
+
+  if (THREE.ShaderPass === undefined) {
+    console.error("THREE.EffectComposer relies on THREE.ShaderPass");
+  }
+
+  this.copyPass = new THREE.ShaderPass(THREE.CopyShader);
+};
+
+Object.assign(THREE.EffectComposer.prototype, {
+  swapBuffers: function(pass) {
+    if (pass.needsSwap) {
+      if (this.maskActive) {
+        const context = this.renderer.context;
+        context.stencilFunc(context.NOTEQUAL, 1, 0xffffffff);
+        this.copyPass.render(this.renderer, this.writeBuffer, this.readBuffer, this.delta);
+        context.stencilFunc(context.EQUAL, 1, 0xffffffff);
+      }
+
+      const tmp = this.readBuffer;
+      this.readBuffer = this.writeBuffer;
+      this.writeBuffer = tmp;
+    }
+
+    if (THREE.MaskPass !== undefined) {
+      if (pass instanceof THREE.MaskPass) {
+        this.maskActive = true;
+      } else if (pass instanceof THREE.ClearMaskPass) {
+        this.maskActive = false;
+      }
+    }
+  },
+
+  addPass: function(pass) {
+    this.passes.push(pass);
+    const size = this.renderer.getDrawingBufferSize();
+    pass.setSize(size.width, size.height);
+  },
+
+  insertPass: function(pass, index) {
+    this.passes.splice(index, 0, pass);
+  },
+
+  render: function(delta, starti) {
+    const maskActive = this.maskActive;
+    let pass;
+    let i;
+    const il = this.passes.length;
+    const scope = this;
+    let currentOnAfterRender;
+    this.delta = delta;
+
+    for (i = starti || 0; i < il; i++) {
+      pass = this.passes[i];
+      if (pass.enabled === false) continue;
+
+      // If VR mode is enabled and rendering the whole scene is required.
+      // The pass renders the scene and and postprocessing is resumed before
+      // submitting the frame to the headset by using the onAfterRender callback.
+      if (this.renderer.vr.enabled && pass.scene) {
+        currentOnAfterRender = pass.scene.onAfterRender;
+        pass.scene.onAfterRender = function() {
+          // Disable stereo rendering when doing postprocessing
+          // on a render target.
+          scope.renderer.vr.enabled = false;
+          scope.render(delta, i + 1, maskActive);
+
+          // Renable vr mode.
+          scope.renderer.vr.enabled = true;
+        };
+
+        pass.render(this.renderer, this.writeBuffer, this.readBuffer);
+
+        // Restore onAfterRender
+        pass.scene.onAfterRender = currentOnAfterRender;
+        this.swapBuffers(pass);
+        return;
+      }
+
+      pass.render(this.renderer, this.writeBuffer, this.readBuffer);
+      this.swapBuffers(pass);
+    }
+  },
+
+  reset: function(renderTarget) {
+    if (renderTarget === undefined) {
+      const size = this.renderer.getDrawingBufferSize();
+      renderTarget = this.renderTarget1.clone();
+      renderTarget.setSize(size.width, size.height);
+    }
+
+    this.renderTarget1.dispose();
+    this.renderTarget2.dispose();
+    this.renderTarget1 = renderTarget;
+    this.renderTarget2 = renderTarget.clone();
+
+    this.writeBuffer = this.renderTarget1;
+    this.readBuffer = this.renderTarget2;
+  },
+
+  setSize: function(width, height) {
+    this.renderTarget1.setSize(width, height);
+    this.renderTarget2.setSize(width, height);
+    for (let i = 0; i < this.passes.length; i++) {
+      this.passes[i].setSize(width, height);
+    }
+  },
+
+  resize: function() {
+    const rendererSize = this.renderer.getDrawingBufferSize();
+    this.setSize(rendererSize.width, rendererSize.height);
+  }
+});
+
+THREE.Pass = function() {
+  // if set to true, the pass is processed by the composer
+  this.enabled = true;
+
+  // if set to true, the pass indicates to swap read and write buffer after rendering
+  this.needsSwap = true;
+
+  // if set to true, the pass clears its buffer before rendering
+  this.clear = false;
+
+  // if set to true, the result of the pass is rendered to screen
+  this.renderToScreen = false;
+};
+
+Object.assign(THREE.Pass.prototype, {
+  setSize: function() {},
+
+  render: function() {
+    console.error("THREE.Pass: .render() must be implemented in derived pass.");
+  }
+});