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fluib.js
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fluib.js
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'use strict';
const promoPopup=document.getElementsByClassName('promo')[0];
const promoPopupClose=document.getElementsByClassName('promo-close')[0];
if(isMobile()){
setTimeout(() => {
promoPopup.style.display='table';
},20000);
}
const appleLink=document.getElementById('apple_link');
const googleLink=document.getElementById('google_link');
// const canvas=document.getElementsByTagName('canvas')[0];
const canvas=document.getElementById('acanvas');
resizeCanvas();
let config={
SIM_RESOLUTION:128,DYE_RESOLUTION:1024,CAPTURE_RESOLUTION:512,DENSITY_DISSIPATION:1,VELOCITY_DISSIPATION:0.2,PRESSURE:0.8,PRESSURE_ITERATIONS:20,CURL:30,SPLAT_RADIUS:0.25,SPLAT_FORCE:6000,SHADING:true,COLORFUL:false,COLOR_UPDATE_SPEED:10,PAUSED:false,BACK_COLOR:{r:0,g:0,b:0},TRANSPARENT:true,BLOOM:true,BLOOM_ITERATIONS:8,BLOOM_RESOLUTION:512,BLOOM_INTENSITY:0.8,BLOOM_THRESHOLD:0.8,BLOOM_SOFT_KNEE:0.7,SUNRAYS:true,SUNRAYS_RESOLUTION:196,SUNRAYS_WEIGHT:1.0
};
function pointerPrototype(){
this.id= -1;
this.texcoordX=0;
this.texcoordY=0;
this.prevTexcoordX=0;
this.prevTexcoordY=0;
this.deltaX=0;
this.deltaY=0;
this.down=false;
this.moved=false;
this.color=[30,0,300];
}
let pointers=[];
let splatStack=[];
pointers.push(new pointerPrototype());
const {gl,ext}=getWebGLContext(canvas);
if(isMobile()){
config.DYE_RESOLUTION=512;
}
if(!ext.supportLinearFiltering){
config.DYE_RESOLUTION=512;
config.SHADING=false;
config.BLOOM=false;
config.SUNRAYS=false;
}
startGUI();
function getWebGLContext(canvas){
const params={alpha:true,depth:false,stencil:false,antialias:true,preserveDrawingBuffer:false};
let gl=canvas.getContext('webgl2',{
imageSmoothingEnabled:false,preserveDrawingBuffer:false,antialias:true,stencil:false,premultipliedAlpha:false,alpha:true,depth:false,desynchronized:false,lowLatency:true,powerPreference:'high-performance'
});
const isWebGL2=!!gl;
if(!isWebGL2) gl=canvas.getContext('webgl',params) || canvas.getContext('experimental-webgl',params);
let halfFloat;
let supportLinearFiltering;
if(isWebGL2){
gl.getExtension('EXT_color_buffer_float');
supportLinearFiltering=gl.getExtension('OES_texture_float_linear');
}else{
halfFloat=gl.getExtension('OES_texture_half_float');
supportLinearFiltering=gl.getExtension('OES_texture_half_float_linear');
}
gl.clearColor(1.0,1.0,1.0,1.0);
const halfFloatTexType=isWebGL2?gl.HALF_FLOAT:halfFloat.HALF_FLOAT_OES;
let formatRGBA;
let formatRG;
let formatR;
if(isWebGL2){
formatRGBA=getSupportedFormat(gl,gl.RGBA16F,gl.RGBA,halfFloatTexType);
formatRG=getSupportedFormat(gl,gl.RG16F,gl.RG,halfFloatTexType);
formatR=getSupportedFormat(gl,gl.R16F,gl.RED,halfFloatTexType);
}else{
formatRGBA=getSupportedFormat(gl,gl.RGBA,gl.RGBA,halfFloatTexType);
formatRG=getSupportedFormat(gl,gl.RGBA,gl.RGBA,halfFloatTexType);
formatR=getSupportedFormat(gl,gl.RGBA,gl.RGBA,halfFloatTexType);
}
return {
gl,ext:{
formatRGBA,formatRG,formatR,halfFloatTexType,supportLinearFiltering
}
};
}
function getSupportedFormat(gl,internalFormat,format,type){
if(!supportRenderTextureFormat(gl,internalFormat,format,type)){
switch(internalFormat){
case gl.R16F:
return getSupportedFormat(gl,gl.RG16F,gl.RG,type);
case gl.RG16F:
return getSupportedFormat(gl,gl.RGBA16F,gl.RGBA,type);
default:
return null;
}
}
return {
internalFormat,format
};
}
function supportRenderTextureFormat(gl,internalFormat,format,type){
let texture=gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D,texture);
gl.texParameteri(gl.TEXTURE_2D,gl.TEXTURE_MIN_FILTER,gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D,gl.TEXTURE_MAG_FILTER,gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D,gl.TEXTURE_WRAP_S,gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D,gl.TEXTURE_WRAP_T,gl.CLAMP_TO_EDGE);
gl.texImage2D(gl.TEXTURE_2D,0,internalFormat,4,4,0,format,type,null);
let fbo=gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER,fbo);
gl.framebufferTexture2D(gl.FRAMEBUFFER,gl.COLOR_ATTACHMENT0,gl.TEXTURE_2D,texture,0);
let status=gl.checkFramebufferStatus(gl.FRAMEBUFFER);
return status == gl.FRAMEBUFFER_COMPLETE;
}
function startGUI(){
var ww=window.innerWidth;
var gui=new dat.GUI({width:ww});
gui.add(config,'DYE_RESOLUTION',{
'high':1024,'medium':512,'low':256,'very low':128
}).name('quality').onFinishChange(initFramebuffers);
gui.add(config,'SIM_RESOLUTION',{
'32':32,'64':64,'128':128,'256':256
}).name('sim resolution').onFinishChange(initFramebuffers);
gui.add(config,'DENSITY_DISSIPATION',0,4.0).name('density diffusion');
gui.add(config,'VELOCITY_DISSIPATION',0,4.0).name('velocity diffusion');
gui.add(config,'PRESSURE',0.0,1.0).name('pressure');
gui.add(config,'CURL',0,50).name('vorticity').step(1);
gui.add(config,'SPLAT_RADIUS',0.01,1.0).name('splat radius');
gui.add(config,'SHADING').name('shading').onFinishChange(updateKeywords);
gui.add(config,'COLORFUL').name('colorful');
gui.add(config,'PAUSED').name('paused').listen();
gui.add({
fun:() => {
splatStack.push(parseInt(Math.random()*20)+5);
}
},'fun').name('Random splats');
let bloomFolder=gui.addFolder('Bloom');
bloomFolder.add(config,'BLOOM').name('enabled').onFinishChange(updateKeywords);
bloomFolder.add(config,'BLOOM_INTENSITY',0.1,2.0).name('intensity');
bloomFolder.add(config,'BLOOM_THRESHOLD',0.0,1.0).name('threshold');
let sunraysFolder=gui.addFolder('Sunrays');
sunraysFolder.add(config,'SUNRAYS').name('enabled').onFinishChange(updateKeywords);
sunraysFolder.add(config,'SUNRAYS_WEIGHT',0.3,1.0).name('weight');
let captureFolder=gui.addFolder('Capture');
captureFolder.addColor(config,'BACK_COLOR').name('background color');
captureFolder.add(config,'TRANSPARENT').name('transparent');
captureFolder.add({fun:captureScreenshot},'fun').name('take screenshot');
let github=gui.add({
fun:() => {
window.open('https://github.com/PavelDoGreat/WebGL-Fluid-Simulation');
ga('send','event','link button','github');
}
},'fun').name('Github');
github.__li.className='cr function bigFont';
github.__li.style.borderLeft='3px solid #8C8C8C';
let githubIcon=document.createElement('span');
github.domElement.parentElement.appendChild(githubIcon);
githubIcon.className='icon github';
let twitter=gui.add({
fun:() => {
ga('send','event','link button','twitter');
window.open('https://twitter.com/PavelDoGreat');
}
},'fun').name('Twitter');
twitter.__li.className='cr function bigFont';
twitter.__li.style.borderLeft='3px solid #8C8C8C';
let twitterIcon=document.createElement('span');
twitter.domElement.parentElement.appendChild(twitterIcon);
twitterIcon.className='icon twitter';
let discord=gui.add({
fun:() => {
ga('send','event','link button','discord');
window.open('https://discordapp.com/invite/CeqZDDE');
}
},'fun').name('Discord');
discord.__li.className='cr function bigFont';
discord.__li.style.borderLeft='3px solid #8C8C8C';
let discordIcon=document.createElement('span');
discord.domElement.parentElement.appendChild(discordIcon);
discordIcon.className='icon discord';
let app=gui.add({
fun:() => {
ga('send','event','link button','app');
window.open('http://onelink.to/5b58bn');
}
},'fun').name('Check out mobile app');
app.__li.className='cr function appBigFont';
app.__li.style.borderLeft='3px solid #00FF7F';
let appIcon=document.createElement('span');
app.domElement.parentElement.appendChild(appIcon);
appIcon.className='icon app';
if(isMobile()) gui.close();
}
function isMobile(){
return /Mobi|Android/i.test(navigator.userAgent);
}
function captureScreenshot(){
let res=getResolution(config.CAPTURE_RESOLUTION);
let target=createFBO(res.width,res.height,ext.formatRGBA.internalFormat,ext.formatRGBA.format,ext.halfFloatTexType,gl.NEAREST);
render(target);
let texture=framebufferToTexture(target);
texture=normalizeTexture(texture,target.width,target.height);
let captureCanvas=textureToCanvas(texture,target.width,target.height);
let datauri=captureCanvas.toDataURL();
downloadURI('fluid.png',datauri);
URL.revokeObjectURL(datauri);
}
function framebufferToTexture(target){
gl.bindFramebuffer(gl.FRAMEBUFFER,target.fbo);
let length=target.width*target.height*4;
let texture=new Float32Array(length);
gl.readPixels(0,0,target.width,target.height,gl.RGBA,gl.FLOAT,texture);
return texture;
}
function normalizeTexture(texture,width,height){
let result=new Uint8Array(texture.length);
let id=0;
for(let i=height-1; i>=0; i--){
for(let j=0; j<width; j++){
let nid=i*width*4+j*4;
result[nid+0]=clamp01(texture[id+0])*255;
result[nid+1]=clamp01(texture[id+1])*255;
result[nid+2]=clamp01(texture[id+2])*255;
result[nid+3]=clamp01(texture[id+3])*255;
id+=4;
}
}
return result;
}
function clamp01(input){
return Math.min(Math.max(input,0),1);
}
function textureToCanvas(texture,width,height){
let captureCanvas=document.createElement('canvas');
let ctx=captureCanvas.getContext('2d');
captureCanvas.width=width;
captureCanvas.height=height;
let imageData=ctx.createImageData(width,height);
imageData.data.set(texture);
ctx.putImageData(imageData,0,0);
return captureCanvas;
}
function downloadURI(filename,uri){
let link=document.createElement('a');
link.download=filename;
link.href=uri;
document.body.appendChild(link);
link.click();
document.body.removeChild(link);
}
class Material{
constructor(vertexShader,fragmentShaderSource){
this.vertexShader=vertexShader;
this.fragmentShaderSource=fragmentShaderSource;
this.programs=[];
this.activeProgram=null;
this.uniforms=[];
}
setKeywords(keywords){
let hash=0;
for(let i=0; i<keywords.length; i++) hash+=hashCode(keywords[i]);
let program=this.programs[hash];
if(program == null){
let fragmentShader=compileShader(gl.FRAGMENT_SHADER,this.fragmentShaderSource,keywords);
program=createProgram(this.vertexShader,fragmentShader);
this.programs[hash]=program;
}
if(program == this.activeProgram) return;
this.uniforms=getUniforms(program);
this.activeProgram=program;
}
bind(){
gl.useProgram(this.activeProgram);
}
}
class Program{
constructor(vertexShader,fragmentShader){
this.uniforms={};
this.program=createProgram(vertexShader,fragmentShader);
this.uniforms=getUniforms(this.program);
}
bind(){
gl.useProgram(this.program);
}
}
function createProgram(vertexShader,fragmentShader){
let program=gl.createProgram();
gl.attachShader(program,vertexShader);
gl.attachShader(program,fragmentShader);
gl.linkProgram(program);
if(!gl.getProgramParameter(program,gl.LINK_STATUS)) console.trace(gl.getProgramInfoLog(program));
return program;
}
function getUniforms(program){
let uniforms=[];
let uniformCount=gl.getProgramParameter(program,gl.ACTIVE_UNIFORMS);
for(let i=0; i<uniformCount; i++){
let uniformName=gl.getActiveUniform(program,i).name;
uniforms[uniformName]=gl.getUniformLocation(program,uniformName);
}
return uniforms;
}
function compileShader(type,source,keywords){
source=addKeywords(source,keywords);
const shader=gl.createShader(type);
gl.shaderSource(shader,source);
gl.compileShader(shader);
if(!gl.getShaderParameter(shader,gl.COMPILE_STATUS)) console.trace(gl.getShaderInfoLog(shader));
return shader;
};
function addKeywords(source,keywords){
if(keywords == null) return source;
let keywordsString='';
keywords.forEach(keyword => {
keywordsString+='#define '+keyword+'\n';
});
return keywordsString+source;
}
const baseVertexShader=compileShader(gl.VERTEX_SHADER,`
precision highp float;
attribute vec2 aPosition;
varying vec2 vUv;
varying vec2 vL;
varying vec2 vR;
varying vec2 vT;
varying vec2 vB;
uniform vec2 texelSize;
void main () {
vUv=aPosition * 0.5 + 0.5;
vL=vUv - vec2(texelSize.x,0.0);
vR=vUv + vec2(texelSize.x,0.0);
vT=vUv + vec2(0.0,texelSize.y);
vB=vUv - vec2(0.0,texelSize.y);
gl_Position=vec4(aPosition,0.0,1.0);
}
`);
const blurVertexShader=compileShader(gl.VERTEX_SHADER,`
precision highp float;
attribute vec2 aPosition;
varying vec2 vUv;
varying vec2 vL;
varying vec2 vR;
uniform vec2 texelSize;
void main () {
vUv=aPosition * 0.5 + 0.5;
float offset=1.33333333;
vL=vUv - texelSize * offset;
vR=vUv + texelSize * offset;
gl_Position=vec4(aPosition,0.0,1.0);
}
`);
const blurShader=compileShader(gl.FRAGMENT_SHADER,`
precision highp float;
precision highp sampler2D;
varying vec2 vUv;
varying vec2 vL;
varying vec2 vR;
uniform sampler2D uTexture;
void main () {
vec4 sum=texture2D(uTexture,vUv) * 0.29411764;
sum += texture2D(uTexture,vL) * 0.35294117;
sum += texture2D(uTexture,vR) * 0.35294117;
gl_FragColor=sum;
}
`);
const copyShader=compileShader(gl.FRAGMENT_SHADER,`
precision highp float;
precision highp sampler2D;
varying highp vec2 vUv;
uniform sampler2D uTexture;
void main () {
gl_FragColor=texture2D(uTexture,vUv);
}
`);
const clearShader=compileShader(gl.FRAGMENT_SHADER,`
precision highp float;
precision highp sampler2D;
varying highp vec2 vUv;
uniform sampler2D uTexture;
uniform float value;
void main () {
gl_FragColor=value * texture2D(uTexture,vUv);
}
`);
const colorShader=compileShader(gl.FRAGMENT_SHADER,`
precision highp float;
uniform vec4 color;
void main () {
gl_FragColor=color;
}
`);
const checkerboardShader=compileShader(gl.FRAGMENT_SHADER,`
precision highp float;
precision highp sampler2D;
varying vec2 vUv;
uniform sampler2D uTexture;
uniform float aspectRatio;
#define SCALE 25.0
void main () {
vec2 uv=floor(vUv * SCALE * vec2(aspectRatio,1.0));
float v=mod(uv.x + uv.y,2.0);
v=v * 0.1 + 0.8;
gl_FragColor=vec4(vec3(v),1.0);
}
`);
const displayShaderSource=`
precision highp float;
precision highp sampler2D;
varying vec2 vUv;
varying vec2 vL;
varying vec2 vR;
varying vec2 vT;
varying vec2 vB;
uniform sampler2D uTexture;
uniform sampler2D uBloom;
uniform sampler2D uSunrays;
uniform sampler2D uDithering;
uniform vec2 ditherScale;
uniform vec2 texelSize;
vec3 linearToGamma (vec3 color) {
color=max(color,vec3(0));
return max(1.055 * pow(color,vec3(0.416666667)) - 0.055,vec3(0));
}
void main () {
vec3 c=texture2D(uTexture,vUv).rgb;
#ifdef SHADING
vec3 lc=texture2D(uTexture,vL).rgb;
vec3 rc=texture2D(uTexture,vR).rgb;
vec3 tc=texture2D(uTexture,vT).rgb;
vec3 bc=texture2D(uTexture,vB).rgb;
float dx=length(rc) - length(lc);
float dy=length(tc) - length(bc);
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 *= diffuse;
#endif
#ifdef BLOOM
vec3 bloom=texture2D(uBloom,vUv).rgb;
#endif
#ifdef SUNRAYS
float sunrays=texture2D(uSunrays,vUv).r;
c *= sunrays;
#ifdef BLOOM
bloom *= sunrays;
#endif
#endif
#ifdef BLOOM
float noise=texture2D(uDithering,vUv * ditherScale).r;
noise=noise * 2.0 - 1.0;
bloom += noise / 255.0;
bloom=linearToGamma(bloom);
c += bloom;
#endif
float a=max(c.r,max(c.g,c.b));
gl_FragColor=vec4(c,a);
}
`;
const bloomPrefilterShader=compileShader(gl.FRAGMENT_SHADER,`
precision highp float;
precision highp sampler2D;
varying vec2 vUv;
uniform sampler2D uTexture;
uniform vec3 curve;
uniform float threshold;
void main () {
vec3 c=texture2D(uTexture,vUv).rgb;
float br=max(c.r,max(c.g,c.b));
float rq=clamp(br - curve.x,0.0,curve.y);
rq=curve.z * rq * rq;
c *= max(rq,br - threshold) / max(br,0.0001);
gl_FragColor=vec4(c,0.0);
}
`);
const bloomBlurShader=compileShader(gl.FRAGMENT_SHADER,`
precision highp float;
precision highp sampler2D;
varying vec2 vL;
varying vec2 vR;
varying vec2 vT;
varying vec2 vB;
uniform sampler2D uTexture;
void main () {
vec4 sum=vec4(0.0);
sum += texture2D(uTexture,vL);
sum += texture2D(uTexture,vR);
sum += texture2D(uTexture,vT);
sum += texture2D(uTexture,vB);
sum *= 0.25;
gl_FragColor=sum;
}
`);
const bloomFinalShader=compileShader(gl.FRAGMENT_SHADER,`
precision highp float;
precision highp sampler2D;
varying vec2 vL;
varying vec2 vR;
varying vec2 vT;
varying vec2 vB;
uniform sampler2D uTexture;
uniform float intensity;
void main () {
vec4 sum=vec4(0.0);
sum += texture2D(uTexture,vL);
sum += texture2D(uTexture,vR);
sum += texture2D(uTexture,vT);
sum += texture2D(uTexture,vB);
sum *= 0.25;
gl_FragColor=sum * intensity;
}
`);
const sunraysMaskShader=compileShader(gl.FRAGMENT_SHADER,`
precision highp float;
precision highp sampler2D;
varying vec2 vUv;
uniform sampler2D uTexture;
void main () {
vec4 c=texture2D(uTexture,vUv);
float br=max(c.r,max(c.g,c.b));
c.a=1.0 - min(max(br * 20.0,0.0),0.8);
gl_FragColor=c;
}
`);
const sunraysShader=compileShader(gl.FRAGMENT_SHADER,`
precision highp float;
precision highp sampler2D;
varying vec2 vUv;
uniform sampler2D uTexture;
uniform float weight;
#define ITERATIONS 16
void main () {
float Density=0.3;
float Decay=0.95;
float Exposure=0.7;
vec2 coord=vUv;
vec2 dir=vUv - 0.5;
dir *= 1.0 / float(ITERATIONS) * Density;
float illuminationDecay=1.0;
float color=texture2D(uTexture,vUv).a;
for (int i=0; i < ITERATIONS; i++)
{
coord -= dir;
float col=texture2D(uTexture,coord).a;
color += col * illuminationDecay * weight;
illuminationDecay *= Decay;
}
gl_FragColor=vec4(color * Exposure,0.0,0.0,1.0);
}
`);
const splatShader=compileShader(gl.FRAGMENT_SHADER,`
precision highp float;
precision highp sampler2D;
varying vec2 vUv;
uniform sampler2D uTarget;
uniform float aspectRatio;
uniform vec3 color;
uniform vec2 point;
uniform float radius;
void main () {
vec2 p=vUv - point.xy;
p.x *= aspectRatio;
vec3 splat=exp(-dot(p,p) / radius) * color;
vec3 base=texture2D(uTarget,vUv).xyz;
gl_FragColor=vec4(base + splat,1.0);
}
`);
const advectionShader=compileShader(gl.FRAGMENT_SHADER,`
precision highp float;
precision highp sampler2D;
varying vec2 vUv;
uniform sampler2D uVelocity;
uniform sampler2D uSource;
uniform vec2 texelSize;
uniform vec2 dyeTexelSize;
uniform float dt;
uniform float dissipation;
vec4 bilerp (sampler2D sam,vec2 uv,vec2 tsize) {
vec2 st=uv / tsize - 0.5;
vec2 iuv=floor(st);
vec2 fuv=fract(st);
vec4 a=texture2D(sam,(iuv + vec2(0.5,0.5)) * tsize);
vec4 b=texture2D(sam,(iuv + vec2(1.5,0.5)) * tsize);
vec4 c=texture2D(sam,(iuv + vec2(0.5,1.5)) * tsize);
vec4 d=texture2D(sam,(iuv + vec2(1.5,1.5)) * tsize);
return mix(mix(a,b,fuv.x),mix(c,d,fuv.x),fuv.y);
}
void main () {
#ifdef MANUAL_FILTERING
vec2 coord=vUv - dt * bilerp(uVelocity,vUv,texelSize).xy * texelSize;
vec4 result=bilerp(uSource,coord,dyeTexelSize);
#else
vec2 coord=vUv - dt * texture2D(uVelocity,vUv).xy * texelSize;
vec4 result=texture2D(uSource,coord);
#endif
float decay=1.0 + dissipation * dt;
gl_FragColor=result / decay;
}`,ext.supportLinearFiltering?null:['MANUAL_FILTERING']);
const divergenceShader=compileShader(gl.FRAGMENT_SHADER,`
precision highp float;
precision highp sampler2D;
varying highp vec2 vUv;
varying highp vec2 vL;
varying highp vec2 vR;
varying highp vec2 vT;
varying highp vec2 vB;
uniform sampler2D uVelocity;
void main () {
float L=texture2D(uVelocity,vL).x;
float R=texture2D(uVelocity,vR).x;
float T=texture2D(uVelocity,vT).y;
float B=texture2D(uVelocity,vB).y;
vec2 C=texture2D(uVelocity,vUv).xy;
if (vL.x < 0.0) { L=-C.x; }
if (vR.x > 1.0) { R=-C.x; }
if (vT.y > 1.0) { T=-C.y; }
if (vB.y < 0.0) { B=-C.y; }
float div=0.5 * (R - L + T - B);
gl_FragColor=vec4(div,0.0,0.0,1.0);
}
`);
const curlShader=compileShader(gl.FRAGMENT_SHADER,`
precision highp float;
precision highp sampler2D;
varying highp vec2 vUv;
varying highp vec2 vL;
varying highp vec2 vR;
varying highp vec2 vT;
varying highp vec2 vB;
uniform sampler2D uVelocity;
void main () {
float L=texture2D(uVelocity,vL).y;
float R=texture2D(uVelocity,vR).y;
float T=texture2D(uVelocity,vT).x;
float B=texture2D(uVelocity,vB).x;
float vorticity=R - L - T + B;
gl_FragColor=vec4(0.5 * vorticity,0.0,0.0,1.0);
}
`);
const vorticityShader=compileShader(gl.FRAGMENT_SHADER,`
precision highp float;
precision highp sampler2D;
varying vec2 vUv;
varying vec2 vL;
varying vec2 vR;
varying vec2 vT;
varying vec2 vB;
uniform sampler2D uVelocity;
uniform sampler2D uCurl;
uniform float curl;
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=0.5 * vec2(abs(T) - abs(B),abs(R) - abs(L));
force /= length(force) + 0.0001;
force *= curl * C;
force.y *= -1.0;
vec2 velocity=texture2D(uVelocity,vUv).xy;
velocity += force * dt;
velocity=min(max(velocity,-1000.0),1000.0);
gl_FragColor=vec4(velocity,0.0,1.0);
}
`);
const pressureShader=compileShader(gl.FRAGMENT_SHADER,`
precision highp float;
precision highp sampler2D;
varying highp vec2 vUv;
varying highp vec2 vL;
varying highp vec2 vR;
varying highp vec2 vT;
varying highp vec2 vB;
uniform sampler2D uPressure;
uniform sampler2D uDivergence;
void main () {
float L=texture2D(uPressure,vL).x;
float R=texture2D(uPressure,vR).x;
float T=texture2D(uPressure,vT).x;
float B=texture2D(uPressure,vB).x;
float C=texture2D(uPressure,vUv).x;
float divergence=texture2D(uDivergence,vUv).x;
float pressure=(L + R + B + T - divergence) * 0.25;
gl_FragColor=vec4(pressure,0.0,0.0,1.0);
}
`);
const gradientSubtractShader=compileShader(gl.FRAGMENT_SHADER,`
precision highp float;
precision highp sampler2D;
varying highp vec2 vUv;
varying highp vec2 vL;
varying highp vec2 vR;
varying highp vec2 vT;
varying highp vec2 vB;
uniform sampler2D uPressure;
uniform sampler2D uVelocity;
void main () {
float L=texture2D(uPressure,vL).x;
float R=texture2D(uPressure,vR).x;
float T=texture2D(uPressure,vT).x;
float B=texture2D(uPressure,vB).x;
vec2 velocity=texture2D(uVelocity,vUv).xy;
velocity.xy -= vec2(R - L,T - B);
gl_FragColor=vec4(velocity,0.0,1.0);
}
`);
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 (target,clear=false) => {
if(target == null){
gl.viewport(0,0,gl.drawingBufferWidth,gl.drawingBufferHeight);
gl.bindFramebuffer(gl.FRAMEBUFFER,null);
}else{
gl.viewport(0,0,target.width,target.height);
gl.bindFramebuffer(gl.FRAMEBUFFER,target.fbo);
}
if(clear){
gl.clearColor(1.0,1.0,1.0,1.0);
gl.clear(gl.COLOR_BUFFER_BIT);
}
gl.drawElements(gl.TRIANGLES,6,gl.UNSIGNED_SHORT,0);
};
})();
function CHECK_FRAMEBUFFER_STATUS(){
let status=gl.checkFramebufferStatus(gl.FRAMEBUFFER);
if(status != gl.FRAMEBUFFER_COMPLETE) console.trace("Framebuffer error: "+status);
}
let dye;
let velocity;
let divergence;
let curl;
let pressure;
let bloom;
let bloomFramebuffers=[];
let sunrays;
let sunraysTemp;
let ditheringTexture=createTextureAsync('LDR_LLL1_0.png');
const blurProgram=new Program(blurVertexShader,blurShader);
const copyProgram=new Program(baseVertexShader,copyShader);
const clearProgram=new Program(baseVertexShader,clearShader);
const colorProgram=new Program(baseVertexShader,colorShader);
const checkerboardProgram=new Program(baseVertexShader,checkerboardShader);
const bloomPrefilterProgram=new Program(baseVertexShader,bloomPrefilterShader);
const bloomBlurProgram=new Program(baseVertexShader,bloomBlurShader);
const bloomFinalProgram=new Program(baseVertexShader,bloomFinalShader);
const sunraysMaskProgram=new Program(baseVertexShader,sunraysMaskShader);
const sunraysProgram=new Program(baseVertexShader,sunraysShader);
const splatProgram=new Program(baseVertexShader,splatShader);
const advectionProgram=new Program(baseVertexShader,advectionShader);
const divergenceProgram=new Program(baseVertexShader,divergenceShader);
const curlProgram=new Program(baseVertexShader,curlShader);
const vorticityProgram=new Program(baseVertexShader,vorticityShader);
const pressureProgram=new Program(baseVertexShader,pressureShader);
const gradienSubtractProgram=new Program(baseVertexShader,gradientSubtractShader);
const displayMaterial=new Material(baseVertexShader,displayShaderSource);
function initFramebuffers(){
let simRes=getResolution(config.SIM_RESOLUTION);
let dyeRes=getResolution(config.DYE_RESOLUTION);
const texType=ext.halfFloatTexType;
const rgba=ext.formatRGBA;
const rg=ext.formatRG;
const r=ext.formatR;
const filtering=ext.supportLinearFiltering?gl.LINEAR:gl.NEAREST;
gl.disable(gl.BLEND);
if(dye == null) dye=createDoubleFBO(dyeRes.width,dyeRes.height,rgba.internalFormat,rgba.format,texType,filtering); else dye=resizeDoubleFBO(dye,dyeRes.width,dyeRes.height,rgba.internalFormat,rgba.format,texType,filtering);
if(velocity == null) velocity=createDoubleFBO(simRes.width,simRes.height,rg.internalFormat,rg.format,texType,filtering); else velocity=resizeDoubleFBO(velocity,simRes.width,simRes.height,rg.internalFormat,rg.format,texType,filtering);
divergence=createFBO(simRes.width,simRes.height,r.internalFormat,r.format,texType,gl.NEAREST);
curl=createFBO(simRes.width,simRes.height,r.internalFormat,r.format,texType,gl.NEAREST);
pressure=createDoubleFBO(simRes.width,simRes.height,r.internalFormat,r.format,texType,gl.NEAREST);
initBloomFramebuffers();
initSunraysFramebuffers();
}
function initBloomFramebuffers(){
let res=getResolution(config.BLOOM_RESOLUTION);
const texType=ext.halfFloatTexType;
const rgba=ext.formatRGBA;
const filtering=ext.supportLinearFiltering?gl.LINEAR:gl.NEAREST;
bloom=createFBO(res.width,res.height,rgba.internalFormat,rgba.format,texType,filtering);
bloomFramebuffers.length=0;
for(let i=0; i<config.BLOOM_ITERATIONS; i++){
let width=res.width >> (i+1);
let height=res.height >> (i+1);
if(width<2 || height<2) break;
let fbo=createFBO(width,height,rgba.internalFormat,rgba.format,texType,filtering);
bloomFramebuffers.push(fbo);
}
}
function initSunraysFramebuffers(){
let res=getResolution(config.SUNRAYS_RESOLUTION);
const texType=ext.halfFloatTexType;
const r=ext.formatR;
const filtering=ext.supportLinearFiltering?gl.LINEAR:gl.NEAREST;
sunrays=createFBO(res.width,res.height,r.internalFormat,r.format,texType,filtering);
sunraysTemp=createFBO(res.width,res.height,r.internalFormat,r.format,texType,filtering);
}
function createFBO(w,h,internalFormat,format,type,param){
gl.activeTexture(gl.TEXTURE0);
let texture=gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D,texture);
gl.texParameteri(gl.TEXTURE_2D,gl.TEXTURE_MIN_FILTER,param);
gl.texParameteri(gl.TEXTURE_2D,gl.TEXTURE_MAG_FILTER,param);
gl.texParameteri(gl.TEXTURE_2D,gl.TEXTURE_WRAP_S,gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D,gl.TEXTURE_WRAP_T,gl.CLAMP_TO_EDGE);
gl.texImage2D(gl.TEXTURE_2D,0,internalFormat,w,h,0,format,type,null);
let fbo=gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER,fbo);
gl.framebufferTexture2D(gl.FRAMEBUFFER,gl.COLOR_ATTACHMENT0,gl.TEXTURE_2D,texture,0);
gl.viewport(0,0,w,h);
gl.clear(gl.COLOR_BUFFER_BIT);
let texelSizeX=1.0/w;
let texelSizeY=1.0/h;
return {
texture,fbo,width:w,height:h,texelSizeX,texelSizeY,attach(id){
gl.activeTexture(gl.TEXTURE0+id);
gl.bindTexture(gl.TEXTURE_2D,texture);
return id;
}
};
}
function createDoubleFBO(w,h,internalFormat,format,type,param){
let fbo1=createFBO(w,h,internalFormat,format,type,param);
let fbo2=createFBO(w,h,internalFormat,format,type,param);
return {
width:w,height:h,texelSizeX:fbo1.texelSizeX,texelSizeY:fbo1.texelSizeY,get read(){
return fbo1;
},set read(value){
fbo1=value;
},get write(){
return fbo2;
},set write(value){
fbo2=value;
},swap(){
let temp=fbo1;
fbo1=fbo2;
fbo2=temp;
}
};
}
function resizeFBO(target,w,h,internalFormat,format,type,param){
let newFBO=createFBO(w,h,internalFormat,format,type,param);
copyProgram.bind();
gl.uniform1i(copyProgram.uniforms.uTexture,target.attach(0));
blit(newFBO);
return newFBO;
}
function resizeDoubleFBO(target,w,h,internalFormat,format,type,param){
if(target.width == w && target.height == h) return target;
target.read=resizeFBO(target.read,w,h,internalFormat,format,type,param);
target.write=createFBO(w,h,internalFormat,format,type,param);
target.width=w;
target.height=h;
target.texelSizeX=1.0/w;
target.texelSizeY=1.0/h;
return target;
}
function createTextureAsync(url){
let texture=gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D,texture);
gl.texParameteri(gl.TEXTURE_2D,gl.TEXTURE_MIN_FILTER,gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D,gl.TEXTURE_MAG_FILTER,gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D,gl.TEXTURE_WRAP_S,gl.REPEAT);
gl.texParameteri(gl.TEXTURE_2D,gl.TEXTURE_WRAP_T,gl.REPEAT);
gl.texImage2D(gl.TEXTURE_2D,0,gl.RGB,1,1,0,gl.RGB,gl.UNSIGNED_BYTE,new Uint8Array([255,255,255]));
let obj={
texture,width:1,height:1,attach(id){
gl.activeTexture(gl.TEXTURE0+id);
gl.bindTexture(gl.TEXTURE_2D,texture);
return id;
}
};
let image=new Image();
image.onload=() => {
obj.width=image.width;
obj.height=image.height;
gl.bindTexture(gl.TEXTURE_2D,texture);
gl.texImage2D(gl.TEXTURE_2D,0,gl.RGB,gl.RGB,gl.UNSIGNED_BYTE,image);
};
image.src=url;
return obj;
}
function updateKeywords(){
let displayKeywords=[];
if(config.SHADING) displayKeywords.push("SHADING");
if(config.BLOOM) displayKeywords.push("BLOOM");
if(config.SUNRAYS) displayKeywords.push("SUNRAYS");
displayMaterial.setKeywords(displayKeywords);
}
updateKeywords();
initFramebuffers();
multipleSplats(parseInt(Math.random()*20)+5);
let lastUpdateTime=Date.now();
let colorUpdateTimer=0.0;
update();
function update(){
const dt=calcDeltaTime();
if(resizeCanvas()) initFramebuffers();
updateColors(dt);
applyInputs();
if(!config.PAUSED) step(dt);
render(null);
requestAnimationFrame(update);
}
function calcDeltaTime(){
let now=Date.now();
let dt=(now-lastUpdateTime)/1000;
dt=Math.min(dt,0.016666);
lastUpdateTime=now;
return dt;
}
function resizeCanvas(){
let width=scaleByPixelRatio(canvas.clientWidth);
let height=scaleByPixelRatio(canvas.clientHeight);
if(canvas.width != width || canvas.height != height){
canvas.width=width;
canvas.height=height;
return true;
}
return false;
}
function updateColors(dt){
if(!config.COLORFUL) return;
colorUpdateTimer+=dt*config.COLOR_UPDATE_SPEED;
if(colorUpdateTimer>=1){
colorUpdateTimer=wrap(colorUpdateTimer,0,1);
pointers.forEach(p => {
p.color=generateColor();
});
}
}
function applyInputs(){
if(splatStack.length>0) multipleSplats(splatStack.pop());
pointers.forEach(p => {
if(p.moved){
p.moved=false;
splatPointer(p);
}
});
}
function step(dt){
gl.disable(gl.BLEND);
curlProgram.bind();
gl.uniform2f(curlProgram.uniforms.texelSize,velocity.texelSizeX,velocity.texelSizeY);
gl.uniform1i(curlProgram.uniforms.uVelocity,velocity.read.attach(0));
blit(curl);
vorticityProgram.bind();
gl.uniform2f(vorticityProgram.uniforms.texelSize,velocity.texelSizeX,velocity.texelSizeY);
gl.uniform1i(vorticityProgram.uniforms.uVelocity,velocity.read.attach(0));
gl.uniform1i(vorticityProgram.uniforms.uCurl,curl.attach(1));
gl.uniform1f(vorticityProgram.uniforms.curl,config.CURL);
gl.uniform1f(vorticityProgram.uniforms.dt,dt);
blit(velocity.write);
velocity.swap();
divergenceProgram.bind();
gl.uniform2f(divergenceProgram.uniforms.texelSize,velocity.texelSizeX,velocity.texelSizeY);
gl.uniform1i(divergenceProgram.uniforms.uVelocity,velocity.read.attach(0));
blit(divergence);
clearProgram.bind();
gl.uniform1i(clearProgram.uniforms.uTexture,pressure.read.attach(0));
gl.uniform1f(clearProgram.uniforms.value,config.PRESSURE);
blit(pressure.write);
pressure.swap();
pressureProgram.bind();
gl.uniform2f(pressureProgram.uniforms.texelSize,velocity.texelSizeX,velocity.texelSizeY);
gl.uniform1i(pressureProgram.uniforms.uDivergence,divergence.attach(0));
for(let i=0; i<config.PRESSURE_ITERATIONS; i++){
gl.uniform1i(pressureProgram.uniforms.uPressure,pressure.read.attach(1));
blit(pressure.write);
pressure.swap();
}
gradienSubtractProgram.bind();
gl.uniform2f(gradienSubtractProgram.uniforms.texelSize,velocity.texelSizeX,velocity.texelSizeY);
gl.uniform1i(gradienSubtractProgram.uniforms.uPressure,pressure.read.attach(0));
gl.uniform1i(gradienSubtractProgram.uniforms.uVelocity,velocity.read.attach(1));
blit(velocity.write);
velocity.swap();
advectionProgram.bind();
gl.uniform2f(advectionProgram.uniforms.texelSize,velocity.texelSizeX,velocity.texelSizeY);
if(!ext.supportLinearFiltering) gl.uniform2f(advectionProgram.uniforms.dyeTexelSize,velocity.texelSizeX,velocity.texelSizeY);
let velocityId=velocity.read.attach(0);
gl.uniform1i(advectionProgram.uniforms.uVelocity,velocityId);
gl.uniform1i(advectionProgram.uniforms.uSource,velocityId);
gl.uniform1f(advectionProgram.uniforms.dt,dt);
gl.uniform1f(advectionProgram.uniforms.dissipation,config.VELOCITY_DISSIPATION);
blit(velocity.write);
velocity.swap();
if(!ext.supportLinearFiltering) gl.uniform2f(advectionProgram.uniforms.dyeTexelSize,dye.texelSizeX,dye.texelSizeY);
gl.uniform1i(advectionProgram.uniforms.uVelocity,velocity.read.attach(0));
gl.uniform1i(advectionProgram.uniforms.uSource,dye.read.attach(1));
gl.uniform1f(advectionProgram.uniforms.dissipation,config.DENSITY_DISSIPATION);
blit(dye.write);
dye.swap();
}
function render(target){
if(config.BLOOM) applyBloom(dye.read,bloom);
if(config.SUNRAYS){
applySunrays(dye.read,dye.write,sunrays);
blur(sunrays,sunraysTemp,1);
}
if(target == null || !config.TRANSPARENT){