huge update

dat.gui.min.js

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\ No newline at end of file
+/**
+ * dat-gui JavaScript Controller Library
+ * http://code.google.com/p/dat-gui
+ *
+ * Copyright 2011 Data Arts Team, Google Creative Lab
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ */
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i},set:function(e){ae&&(i=e,e?X.bind(window,"unload",r):X.unbind(window,"unload",r),localStorage.setItem(m(n,"isLocal"),e))}}}),S.isUndefined(o.parent)){if(o.closed=!1,X.addClass(this.domElement,e.CLASS_MAIN),X.makeSelectable(this.domElement,!1),ae&&i){n.useLocalStorage=!0;var a=localStorage.getItem(m(this,"gui"));a&&(o.load=JSON.parse(a))}this.__closeButton=document.createElement("div"),this.__closeButton.innerHTML=e.TEXT_CLOSED,X.addClass(this.__closeButton,e.CLASS_CLOSE_BUTTON),o.closeOnTop?(X.addClass(this.__closeButton,e.CLASS_CLOSE_TOP),this.domElement.insertBefore(this.__closeButton,this.domElement.childNodes[0])):(X.addClass(this.__closeButton,e.CLASS_CLOSE_BOTTOM),this.domElement.appendChild(this.__closeButton)),X.bind(this.__closeButton,"click",function(){n.closed=!n.closed})}else{void 0===o.closed&&(o.closed=!0);var l=document.createTextNode(o.name);X.addClass(l,"controller-name"),s=c(n,l);X.addClass(this.__ul,e.CLASS_CLOSED),X.addClass(s,"title"),X.bind(s,"click",function(e){return 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e=n.getRoot();e.width+=1,S.defer(function(){e.width-=1})}()};he.toggleHide=function(){ue=!ue,S.each(_e,function(e){e.domElement.style.display=ue?"none":""})},he.CLASS_AUTO_PLACE="a",he.CLASS_AUTO_PLACE_CONTAINER="ac",he.CLASS_MAIN="main",he.CLASS_CONTROLLER_ROW="cr",he.CLASS_TOO_TALL="taller-than-window",he.CLASS_CLOSED="closed",he.CLASS_CLOSE_BUTTON="close-button",he.CLASS_CLOSE_TOP="close-top",he.CLASS_CLOSE_BOTTOM="close-bottom",he.CLASS_DRAG="drag",he.DEFAULT_WIDTH=245,he.TEXT_CLOSED="Close Controls",he.TEXT_OPEN="Open Controls",he._keydownHandler=function(e){"text"===document.activeElement.type||72!==e.which&&72!==e.keyCode||he.toggleHide()},X.bind(window,"keydown",he._keydownHandler,!1),S.extend(he.prototype,{add:function(e,t){return f(this,e,t,{factoryArgs:Array.prototype.slice.call(arguments,2)})},addColor:function(e,t){return f(this,e,t,{color:!0})},remove:function(e){this.__ul.removeChild(e.__li),this.__controllers.splice(this.__controllers.indexOf(e),1);var t=this;S.defer(function(){t.onResize()})},destroy:function(){if(this.parent)throw new Error("Only the root GUI should be removed with .destroy(). For subfolders, use gui.removeFolder(folder) instead.");this.autoPlace&&ce.removeChild(this.domElement);var e=this;S.each(this.__folders,function(t){e.removeFolder(t)}),X.unbind(window,"keydown",he._keydownHandler,!1),u(this)},addFolder:function(e){if(void 0!==this.__folders[e])throw new Error('You already have a folder in this GUI by the name "'+e+'"');var t={name:e,parent:this};t.autoPlace=this.autoPlace,this.load&&this.load.folders&&this.load.folders[e]&&(t.closed=this.load.folders[e].closed,t.load=this.load.folders[e]);var n=new he(t);this.__folders[e]=n;var o=c(this,n.domElement);return X.addClass(o,"folder"),n},removeFolder:function(e){this.__ul.removeChild(e.domElement.parentElement),delete this.__folders[e.name],this.load&&this.load.folders&&this.load.folders[e.name]&&delete this.load.folders[e.name],u(e);var t=this;S.each(e.__folders,function(t){e.removeFolder(t)}),S.defer(function(){t.onResize()})},open:function(){this.closed=!1},close:function(){this.closed=!0},onResize:function(){var e=this.getRoot();if(e.scrollable){var t=X.getOffset(e.__ul).top,n=0;S.each(e.__ul.childNodes,function(t){e.autoPlace&&t===e.__save_row||(n+=X.getHeight(t))}),window.innerHeight-t-20<n?(X.addClass(e.domElement,he.CLASS_TOO_TALL),e.__ul.style.height=window.innerHeight-t-20+"px"):(X.removeClass(e.domElement,he.CLASS_TOO_TALL),e.__ul.style.height="auto")}e.__resize_handle&&S.defer(function(){e.__resize_handle.style.height=e.__ul.offsetHeight+"px"}),e.__closeButton&&(e.__closeButton.style.width=e.width+"px")},onResizeDebounced:S.debounce(function(){this.onResize()},50),remember:function(){if(S.isUndefined(le)&&((le=new ie).domElement.innerHTML='<div id="dg-save" class="dg dialogue">\n\n  Here\'s the new load parameter for your <code>GUI</code>\'s constructor:\n\n  <textarea id="dg-new-constructor"></textarea>\n\n  <div id="dg-save-locally">\n\n    <input id="dg-local-storage" type="checkbox"/> Automatically save\n    values to <code>localStorage</code> on exit.\n\n    <div id="dg-local-explain">The values saved to <code>localStorage</code> will\n      override those passed to <code>dat.GUI</code>\'s constructor. This makes it\n      easier to work incrementally, but <code>localStorage</code> is fragile,\n      and your friends may not see the same values you do.\n\n    </div>\n\n  </div>\n\n</div>'),this.parent)throw new Error("You can only call remember on a top level GUI.");var e=this;S.each(Array.prototype.slice.call(arguments),function(t){0===e.__rememberedObjects.length&&v(e),-1===e.__rememberedObjects.indexOf(t)&&e.__rememberedObjects.push(t)}),this.autoPlace&&w(this,this.width)},getRoot:function(){for(var e=this;e.parent;)e=e.parent;return e},getSaveObject:function(){var e=this.load;return e.closed=this.closed,this.__rememberedObjects.length>0&&(e.preset=this.preset,e.remembered||(e.remembered={}),e.remembered[this.preset]=x(this)),e.folders={},S.each(this.__folders,function(t,n){e.folders[n]=t.getSaveObject()}),e},save:function(){this.load.remembered||(this.load.remembered={}),this.load.remembered[this.preset]=x(this),_(this,!1),this.saveToLocalStorageIfPossible()},saveAs:function(e){this.load.remembered||(this.load.remembered={},this.load.remembered[se]=x(this,!0)),this.load.remembered[e]=x(this),this.preset=e,g(this,e,!0),this.saveToLocalStorageIfPossible()},revert:function(e){S.each(this.__controllers,function(t){this.getRoot().load.remembered?p(e||this.getRoot(),t):t.setValue(t.initialValue),t.__onFinishChange&&t.__onFinishChange.call(t,t.getValue())},this),S.each(this.__folders,function(e){e.revert(e)}),e||_(this.getRoot(),!1)},listen:function(e){var t=0===this.__listening.length;this.__listening.push(e),t&&C(this.__listening)},updateDisplay:function(){S.each(this.__controllers,function(e){e.updateDisplay()}),S.each(this.__folders,function(e){e.updateDisplay()})}});var pe={Color:I,math:N,interpret:R},fe={Controller:z,BooleanController:K,OptionController:Y,StringController:J,NumberController:W,NumberControllerBox:Q,NumberControllerSlider:q,FunctionController:Z,ColorController:$},me={dom:X},ge={GUI:he},be=he,ve={color:pe,controllers:fe,dom:me,gui:ge,GUI:be};e.color=pe,e.controllers=fe,e.dom=me,e.gui=ge,e.GUI=be,e.default=ve,Object.defineProperty(e,"__esModule",{value:!0})});
\ No newline at end of file

script.js

@@ -5,15 +5,20 @@ canvas.width = canvas.clientWidth;
 canvas.height = canvas.clientHeight;
 
 let config = {
-    TEXTURE_DOWNSAMPLE: 1,
-    DENSITY_DISSIPATION: 0.98,
-    VELOCITY_DISSIPATION: 0.99,
+    SIM_RESOLUTION: 128,
+    DYE_RESOLUTION: 512,
+    DENSITY_DISSIPATION: 0.97,
+    VELOCITY_DISSIPATION: 0.98,
     PRESSURE_DISSIPATION: 0.8,
-    PRESSURE_ITERATIONS: 25,
+    PRESSURE_ITERATIONS: 20,
     CURL: 30,
-    SPLAT_RADIUS: 0.005
+    SPLAT_RADIUS: 0.5,
+    SHADING: true
 }
 
+if (isMobile())
+    config.DYE_RESOLUTION = 256;
+
 let pointers = [];
 let splatStack = [];
 
@@ -117,13 +122,15 @@ function supportRenderTextureFormat (gl, internalFormat, format, type) {
 
 function startGUI () {
     var gui = new dat.GUI({ width: 300 });
-    gui.add(config, 'TEXTURE_DOWNSAMPLE', { Full: 0, Half: 1, Quarter: 2 }).name('resolution').onFinishChange(initFramebuffers);
+    gui.add(config, 'SIM_RESOLUTION', { '32': 32, '64': 64, '128': 128, '256': 256 }).name('sim resolution').onFinishChange(initFramebuffers);
+    gui.add(config, 'DYE_RESOLUTION', { '128': 128, '256': 256, '512': 512, '1024': 1024 }).name('dye resolution').onFinishChange(initFramebuffers);
     gui.add(config, 'DENSITY_DISSIPATION', 0.9, 1.0).name('density diffusion');
     gui.add(config, 'VELOCITY_DISSIPATION', 0.9, 1.0).name('velocity diffusion');
     gui.add(config, 'PRESSURE_DISSIPATION', 0.0, 1.0).name('pressure diffusion');
-    gui.add(config, 'PRESSURE_ITERATIONS', 1, 60).name('iterations');
+    // gui.add(config, 'PRESSURE_ITERATIONS', 1, 60).name('iterations');
     gui.add(config, 'CURL', 0, 50).name('vorticity').step(1);
-    gui.add(config, 'SPLAT_RADIUS', 0.0001, 0.01).name('splat radius');
+    gui.add(config, 'SPLAT_RADIUS', 0.01, 1.0).name('splat radius');
+    gui.add(config, 'SHADING').name('shading');
 
     gui.add({ fun: () => {
         splatStack.push(parseInt(Math.random() * 20) + 5);
@@ -159,9 +166,14 @@ function startGUI () {
     app.domElement.parentElement.appendChild(appIcon);
     appIcon.className = 'icon app';
 
+    if (isMobile())
         gui.close();
 }
 
+function isMobile () {
+    return /Mobi|Android/i.test(navigator.userAgent);
+}
+
 function pointerPrototype () {
     this.id = -1;
     this.x = 0;
@@ -257,6 +269,38 @@ const displayShader = compileShader(gl.FRAGMENT_SHADER, `
     }
 `);
 
+const displayShadingShader = compileShader(gl.FRAGMENT_SHADER, `
+    precision highp float;
+    precision mediump sampler2D;
+
+    varying vec2 vUv;
+    varying vec2 vL;
+    varying vec2 vR;
+    varying vec2 vT;
+    varying vec2 vB;
+    uniform sampler2D uTexture;
+    uniform vec2 texelSize;
+
+    void main () {
+        vec3 L = texture2D(uTexture, vL).rgb;
+        vec3 R = texture2D(uTexture, vR).rgb;
+        vec3 T = texture2D(uTexture, vT).rgb;
+        vec3 B = texture2D(uTexture, vB).rgb;
+        vec3 C = texture2D(uTexture, vUv).rgb;
+
+        float dx = length(R) - length(L);
+        float dy = length(T) - length(B);
+
+        vec3 n = normalize(vec3(dx, dy, length(texelSize)));
+        vec3 l = vec3(0.0, 0.0, 1.0);
+
+        float diffuse = clamp(dot(n, l) + 0.7, 0.7, 1.0);
+        C.rgb *= diffuse;
+
+        gl_FragColor = vec4(C, 1.0);
+    }
+`);
+
 const splatShader = compileShader(gl.FRAGMENT_SHADER, `
     precision highp float;
     precision mediump sampler2D;
@@ -302,7 +346,7 @@ const advectionManualFilteringShader = compileShader(gl.FRAGMENT_SHADER, `
     }
 
     void main () {
-        vec2 coord = gl_FragCoord.xy - dt * texture2D(uVelocity, vUv).xy;
+        vec2 coord = gl_FragCoord.xy - dt * bilerp(uVelocity, vUv).xy;
         gl_FragColor = dissipation * bilerp(uSource, coord);
         gl_FragColor.a = 1.0;
     }
@@ -373,7 +417,7 @@ const curlShader = compileShader(gl.FRAGMENT_SHADER, `
         float T = texture2D(uVelocity, vT).x;
         float B = texture2D(uVelocity, vB).x;
         float vorticity = R - L - T + B;
-        gl_FragColor = vec4(vorticity, 0.0, 0.0, 1.0);
+        gl_FragColor = vec4(0.5 * vorticity, 0.0, 0.0, 1.0);
     }
 `);
 
@@ -382,6 +426,8 @@ const vorticityShader = compileShader(gl.FRAGMENT_SHADER, `
     precision mediump sampler2D;
 
     varying vec2 vUv;
+    varying vec2 vL;
+    varying vec2 vR;
     varying vec2 vT;
     varying vec2 vB;
     uniform sampler2D uVelocity;
@@ -390,11 +436,17 @@ const vorticityShader = compileShader(gl.FRAGMENT_SHADER, `
     uniform float dt;
 
     void main () {
+        float L = texture2D(uCurl, vL).x;
+        float R = texture2D(uCurl, vR).x;
         float T = texture2D(uCurl, vT).x;
         float B = texture2D(uCurl, vB).x;
         float C = texture2D(uCurl, vUv).x;
-        vec2 force = vec2(abs(T) - abs(B), 0.0);
-        force *= 1.0 / length(force + 0.00001) * curl * C;
+
+        vec2 force = 0.5 * vec2(abs(T) - abs(B), abs(R) - abs(L));
+        force /= length(force) + 0.0001;
+        force *= curl * C;
+        force.y *= -1.0;
+
         vec2 vel = texture2D(uVelocity, vUv).xy;
         gl_FragColor = vec4(vel + force * dt, 0.0, 1.0);
     }
@@ -457,17 +509,33 @@ const gradientSubtractShader = compileShader(gl.FRAGMENT_SHADER, `
     }
 `);
 
-let textureWidth;
-let textureHeight;
+const blit = (() => {
+    gl.bindBuffer(gl.ARRAY_BUFFER, gl.createBuffer());
+    gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([-1, -1, -1, 1, 1, 1, 1, -1]), gl.STATIC_DRAW);
+    gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, gl.createBuffer());
+    gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array([0, 1, 2, 0, 2, 3]), gl.STATIC_DRAW);
+    gl.vertexAttribPointer(0, 2, gl.FLOAT, false, 0, 0);
+    gl.enableVertexAttribArray(0);
+
+    return (destination) => {
+        gl.bindFramebuffer(gl.FRAMEBUFFER, destination);
+        gl.drawElements(gl.TRIANGLES, 6, gl.UNSIGNED_SHORT, 0);
+    }
+})();
+
+let simWidth;
+let simHeight;
+let dyeWidth;
+let dyeHeight;
 let density;
 let velocity;
 let divergence;
 let curl;
 let pressure;
-initFramebuffers();
 
 const clearProgram           = new GLProgram(baseVertexShader, clearShader);
 const displayProgram         = new GLProgram(baseVertexShader, displayShader);
+const displayShadingProgram  = new GLProgram(baseVertexShader, displayShadingShader);
 const splatProgram           = new GLProgram(baseVertexShader, splatShader);
 const advectionProgram       = new GLProgram(baseVertexShader, ext.supportLinearFiltering ? advectionShader : advectionManualFilteringShader);
 const divergenceProgram      = new GLProgram(baseVertexShader, divergenceShader);
@@ -477,19 +545,38 @@ const pressureProgram = new GLProgram(baseVertexShader, pressureShader);
 const gradienSubtractProgram = new GLProgram(baseVertexShader, gradientSubtractShader);
 
 function initFramebuffers () {
-    textureWidth = gl.drawingBufferWidth >> config.TEXTURE_DOWNSAMPLE;
-    textureHeight = gl.drawingBufferHeight >> config.TEXTURE_DOWNSAMPLE;
+    let simRes = getResolution(config.SIM_RESOLUTION);
+    let dyeRes = getResolution(config.DYE_RESOLUTION);
+
+    simWidth  = simRes.width;
+    simHeight = simRes.height;
+    dyeWidth  = dyeRes.width;
+    dyeHeight = dyeRes.height;
 
     const texType = ext.halfFloatTexType;
     const rgba    = ext.formatRGBA;
     const rg      = ext.formatRG;
     const r       = ext.formatR;
 
-    density    = createDoubleFBO(2, textureWidth, textureHeight, rgba.internalFormat, rgba.format, texType, ext.supportLinearFiltering ? gl.LINEAR : gl.NEAREST);
-    velocity   = createDoubleFBO(0, textureWidth, textureHeight, rg.internalFormat, rg.format, texType, ext.supportLinearFiltering ? gl.LINEAR : gl.NEAREST);
-    divergence = createFBO      (4, textureWidth, textureHeight, r.internalFormat, r.format, texType, gl.NEAREST);
-    curl       = createFBO      (5, textureWidth, textureHeight, r.internalFormat, r.format, texType, gl.NEAREST);
-    pressure   = createDoubleFBO(6, textureWidth, textureHeight, r.internalFormat, r.format, texType, gl.NEAREST);
+    density    = createDoubleFBO(2, dyeWidth, dyeHeight, rgba.internalFormat, rgba.format, texType, ext.supportLinearFiltering ? gl.LINEAR : gl.NEAREST);
+    velocity   = createDoubleFBO(0, simWidth, simHeight, rg.internalFormat, rg.format, texType, ext.supportLinearFiltering ? gl.LINEAR : gl.NEAREST);
+    divergence = createFBO      (4, simWidth, simHeight, r.internalFormat, r.format, texType, gl.NEAREST);
+    curl       = createFBO      (5, simWidth, simHeight, r.internalFormat, r.format, texType, gl.NEAREST);
+    pressure   = createDoubleFBO(6, simWidth, simHeight, r.internalFormat, r.format, texType, gl.NEAREST);
+}
+
+function getResolution (resolution) {
+    let aspectRatio = gl.drawingBufferWidth / gl.drawingBufferHeight;
+    if (aspectRatio < 1)
+        aspectRatio = 1.0 / aspectRatio;
+
+    let max = resolution * aspectRatio;
+    let min = resolution;
+
+    if (gl.drawingBufferWidth > gl.drawingBufferHeight)
+        return { width: max, height: min };
+    else
+        return { width: min, height: max };
 }
 
 function createFBO (texId, w, h, internalFormat, format, type, param) {
@@ -508,7 +595,15 @@ function createFBO (texId, w, h, internalFormat, format, type, param) {
     gl.viewport(0, 0, w, h);
     gl.clear(gl.COLOR_BUFFER_BIT);
 
-    return [texture, fbo, texId];
+    return {
+        texture,
+        fbo,
+        texId,
+        internalFormat,
+        format,
+        type,
+        param
+    };
 }
 
 function createDoubleFBO (texId, w, h, internalFormat, format, type, param) {
@@ -526,52 +621,48 @@ function createDoubleFBO (texId, w, h, internalFormat, format, type, param) {
             let temp = fbo1;
             fbo1 = fbo2;
             fbo2 = temp;
+        },
+        set read (value) {
+            fbo1 = value;
+        },
+        set write (value) {
+            fbo2 = value;
         }
     }
 }
 
-const blit = (() => {
-    gl.bindBuffer(gl.ARRAY_BUFFER, gl.createBuffer());
-    gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([-1, -1, -1, 1, 1, 1, 1, -1]), gl.STATIC_DRAW);
-    gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, gl.createBuffer());
-    gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array([0, 1, 2, 0, 2, 3]), gl.STATIC_DRAW);
-    gl.vertexAttribPointer(0, 2, gl.FLOAT, false, 0, 0);
-    gl.enableVertexAttribArray(0);
-
-    return (destination) => {
-        gl.bindFramebuffer(gl.FRAMEBUFFER, destination);
-        gl.drawElements(gl.TRIANGLES, 6, gl.UNSIGNED_SHORT, 0);
-    }
-})();
-
-let lastTime = Date.now();
+initFramebuffers();
 multipleSplats(parseInt(Math.random() * 20) + 5);
+
 update();
 
 function update () {
     resizeCanvas();
+    step(0.016);
+    render();
+    requestAnimationFrame(update);
+}
 
-    const dt = Math.min((Date.now() - lastTime) / 1000, 0.016);
-    lastTime = Date.now();
-
-    gl.viewport(0, 0, textureWidth, textureHeight);
-
+function step (dt) {
     if (splatStack.length > 0)
         multipleSplats(splatStack.pop());
 
+    gl.viewport(0, 0, simWidth, simHeight);
+
     advectionProgram.bind();
-    gl.uniform2f(advectionProgram.uniforms.texelSize, 1.0 / textureWidth, 1.0 / textureHeight);
-    gl.uniform1i(advectionProgram.uniforms.uVelocity, velocity.read[2]);
-    gl.uniform1i(advectionProgram.uniforms.uSource, velocity.read[2]);
+    gl.uniform2f(advectionProgram.uniforms.texelSize, 1.0 / simWidth, 1.0 / simHeight);
+    gl.uniform1i(advectionProgram.uniforms.uVelocity, velocity.read.texId);
+    gl.uniform1i(advectionProgram.uniforms.uSource, velocity.read.texId);
     gl.uniform1f(advectionProgram.uniforms.dt, dt);
     gl.uniform1f(advectionProgram.uniforms.dissipation, config.VELOCITY_DISSIPATION);
-    blit(velocity.write[1]);
+    blit(velocity.write.fbo);
     velocity.swap();
 
-    gl.uniform1i(advectionProgram.uniforms.uVelocity, velocity.read[2]);
-    gl.uniform1i(advectionProgram.uniforms.uSource, density.read[2]);
+    gl.viewport(0, 0, dyeWidth, dyeHeight);
+    gl.uniform1i(advectionProgram.uniforms.uVelocity, velocity.read.texId);
+    gl.uniform1i(advectionProgram.uniforms.uSource, density.read.texId);
     gl.uniform1f(advectionProgram.uniforms.dissipation, config.DENSITY_DISSIPATION);
-    blit(density.write[1]);
+    blit(density.write.fbo);
     density.swap();
 
     for (let i = 0; i < pointers.length; i++) {
@@ -582,80 +673,99 @@ function update () {
         }
     }
 
+    gl.viewport(0, 0, simWidth, simHeight);
+
     curlProgram.bind();
-    gl.uniform2f(curlProgram.uniforms.texelSize, 1.0 / textureWidth, 1.0 / textureHeight);
-    gl.uniform1i(curlProgram.uniforms.uVelocity, velocity.read[2]);
-    blit(curl[1]);
+    gl.uniform2f(curlProgram.uniforms.texelSize, 1.0 / simWidth, 1.0 / simHeight);
+    gl.uniform1i(curlProgram.uniforms.uVelocity, velocity.read.texId);
+    blit(curl.fbo);
 
     vorticityProgram.bind();
-    gl.uniform2f(vorticityProgram.uniforms.texelSize, 1.0 / textureWidth, 1.0 / textureHeight);
-    gl.uniform1i(vorticityProgram.uniforms.uVelocity, velocity.read[2]);
-    gl.uniform1i(vorticityProgram.uniforms.uCurl, curl[2]);
+    gl.uniform2f(vorticityProgram.uniforms.texelSize, 1.0 / simWidth, 1.0 / simHeight);
+    gl.uniform1i(vorticityProgram.uniforms.uVelocity, velocity.read.texId);
+    gl.uniform1i(vorticityProgram.uniforms.uCurl, curl.texId);
     gl.uniform1f(vorticityProgram.uniforms.curl, config.CURL);
     gl.uniform1f(vorticityProgram.uniforms.dt, dt);
-    blit(velocity.write[1]);
+    blit(velocity.write.fbo);
     velocity.swap();
 
     divergenceProgram.bind();
-    gl.uniform2f(divergenceProgram.uniforms.texelSize, 1.0 / textureWidth, 1.0 / textureHeight);
-    gl.uniform1i(divergenceProgram.uniforms.uVelocity, velocity.read[2]);
-    blit(divergence[1]);
+    gl.uniform2f(divergenceProgram.uniforms.texelSize, 1.0 / simWidth, 1.0 / simHeight);
+    gl.uniform1i(divergenceProgram.uniforms.uVelocity, velocity.read.texId);
+    blit(divergence.fbo);
 
     clearProgram.bind();
-    let pressureTexId = pressure.read[2];
+    let pressureTexId = pressure.read.texId;
     gl.activeTexture(gl.TEXTURE0 + pressureTexId);
-    gl.bindTexture(gl.TEXTURE_2D, pressure.read[0]);
+    gl.bindTexture(gl.TEXTURE_2D, pressure.read.texture);
     gl.uniform1i(clearProgram.uniforms.uTexture, pressureTexId);
     gl.uniform1f(clearProgram.uniforms.value, config.PRESSURE_DISSIPATION);
-    blit(pressure.write[1]);
+    blit(pressure.write.fbo);
     pressure.swap();
 
     pressureProgram.bind();
-    gl.uniform2f(pressureProgram.uniforms.texelSize, 1.0 / textureWidth, 1.0 / textureHeight);
-    gl.uniform1i(pressureProgram.uniforms.uDivergence, divergence[2]);
-    pressureTexId = pressure.read[2];
+    gl.uniform2f(pressureProgram.uniforms.texelSize, 1.0 / simWidth, 1.0 / simHeight);
+    gl.uniform1i(pressureProgram.uniforms.uDivergence, divergence.texId);
+    pressureTexId = pressure.read.texId;
     gl.uniform1i(pressureProgram.uniforms.uPressure, pressureTexId);
     gl.activeTexture(gl.TEXTURE0 + pressureTexId);
     for (let i = 0; i < config.PRESSURE_ITERATIONS; i++) {
-        gl.bindTexture(gl.TEXTURE_2D, pressure.read[0]);
-        blit(pressure.write[1]);
+        gl.bindTexture(gl.TEXTURE_2D, pressure.read.texture);
+        blit(pressure.write.fbo);
         pressure.swap();
     }
 
     gradienSubtractProgram.bind();
-    gl.uniform2f(gradienSubtractProgram.uniforms.texelSize, 1.0 / textureWidth, 1.0 / textureHeight);
-    gl.uniform1i(gradienSubtractProgram.uniforms.uPressure, pressure.read[2]);
-    gl.uniform1i(gradienSubtractProgram.uniforms.uVelocity, velocity.read[2]);
-    blit(velocity.write[1]);
+    gl.uniform2f(gradienSubtractProgram.uniforms.texelSize, 1.0 / simWidth, 1.0 / simHeight);
+    gl.uniform1i(gradienSubtractProgram.uniforms.uPressure, pressure.read.texId);
+    gl.uniform1i(gradienSubtractProgram.uniforms.uVelocity, velocity.read.texId);
+    blit(velocity.write.fbo);
     velocity.swap();
+}
+
+function render () {
+    let width  = gl.drawingBufferWidth;
+    let height = gl.drawingBufferHeight;
 
-    gl.viewport(0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight);
+    gl.viewport(0, 0, width, height);
+
+    if (config.SHADING) {
+        displayShadingProgram.bind();
+        gl.uniform2f(displayShadingProgram.uniforms.texelSize, 1.0 / width, 1.0 / height);
+        gl.uniform1i(displayShadingProgram.uniforms.uTexture, density.read.texId);
+    }
+    else {
         displayProgram.bind();
-    gl.uniform1i(displayProgram.uniforms.uTexture, density.read[2]);
-    blit(null);
+        gl.uniform1i(displayProgram.uniforms.uTexture, density.read.texId);
+    }
 
-    requestAnimationFrame(update);
+    blit(null);
 }
 
 function splat (x, y, dx, dy, color) {
+    gl.viewport(0, 0, simWidth, simHeight);
     splatProgram.bind();
-    gl.uniform1i(splatProgram.uniforms.uTarget, velocity.read[2]);
+    gl.uniform1i(splatProgram.uniforms.uTarget, velocity.read.texId);
     gl.uniform1f(splatProgram.uniforms.aspectRatio, canvas.width / canvas.height);
     gl.uniform2f(splatProgram.uniforms.point, x / canvas.width, 1.0 - y / canvas.height);
     gl.uniform3f(splatProgram.uniforms.color, dx, -dy, 1.0);
-    gl.uniform1f(splatProgram.uniforms.radius, config.SPLAT_RADIUS);
-    blit(velocity.write[1]);
+    gl.uniform1f(splatProgram.uniforms.radius, config.SPLAT_RADIUS / 100.0);
+    blit(velocity.write.fbo);
     velocity.swap();
 
-    gl.uniform1i(splatProgram.uniforms.uTarget, density.read[2]);
-    gl.uniform3f(splatProgram.uniforms.color, color[0] * 0.3, color[1] * 0.3, color[2] * 0.3);
-    blit(density.write[1]);
+    gl.viewport(0, 0, dyeWidth, dyeHeight);
+    gl.uniform1i(splatProgram.uniforms.uTarget, density.read.texId);
+    gl.uniform3f(splatProgram.uniforms.color, color.r, color.g, color.b);
+    blit(density.write.fbo);
     density.swap();
 }
 
 function multipleSplats (amount) {
     for (let i = 0; i < amount; i++) {
-        const color = [Math.random() * 10, Math.random() * 10, Math.random() * 10];
+        const color = generateColor();
+        color.r *= 10.0;
+        color.g *= 10.0;
+        color.b *= 10.0;
         const x = canvas.width * Math.random();
         const y = canvas.height * Math.random();
         const dx = 1000 * (Math.random() - 0.5);
@@ -674,8 +784,8 @@ function resizeCanvas () {
 
 canvas.addEventListener('mousemove', (e) => {
     pointers[0].moved = pointers[0].down;
-    pointers[0].dx = (e.offsetX - pointers[0].x) * 10.0;
-    pointers[0].dy = (e.offsetY - pointers[0].y) * 10.0;
+    pointers[0].dx = (e.offsetX - pointers[0].x) * 5.0;
+    pointers[0].dy = (e.offsetY - pointers[0].y) * 5.0;
     pointers[0].x = e.offsetX;
     pointers[0].y = e.offsetY;
 });
@@ -686,8 +796,8 @@ canvas.addEventListener('touchmove', (e) => {
     for (let i = 0; i < touches.length; i++) {
         let pointer = pointers[i];
         pointer.moved = pointer.down;
-        pointer.dx = (touches[i].pageX - pointer.x) * 10.0;
-        pointer.dy = (touches[i].pageY - pointer.y) * 10.0;
+        pointer.dx = (touches[i].pageX - pointer.x) * 8.0;
+        pointer.dy = (touches[i].pageY - pointer.y) * 8.0;
         pointer.x = touches[i].pageX;
         pointer.y = touches[i].pageY;
     }
@@ -695,7 +805,7 @@ canvas.addEventListener('touchmove', (e) => {
 
 canvas.addEventListener('mousedown', () => {
     pointers[0].down = true;
-    pointers[0].color = [Math.random() + 0.2, Math.random() + 0.2, Math.random() + 0.2];
+    pointers[0].color = generateColor();
 });
 
 canvas.addEventListener('touchstart', (e) => {
@@ -709,7 +819,7 @@ canvas.addEventListener('touchstart', (e) => {
         pointers[i].down = true;
         pointers[i].x = touches[i].pageX;
         pointers[i].y = touches[i].pageY;
-        pointers[i].color = [Math.random() + 0.2, Math.random() + 0.2, Math.random() + 0.2];
+        pointers[i].color = generateColor();
     }
 });
 
@@ -724,3 +834,11 @@ window.addEventListener('touchend', (e) => {
             if (touches[i].identifier == pointers[j].id)
                 pointers[j].down = false;
 });
+
+function generateColor () {
+    return {
+        r: Math.random() * 0.15 + 0.05,
+        g: Math.random() * 0.15 + 0.05,
+        b: Math.random() * 0.15 + 0.05
+    };
+}
\ No newline at end of file