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index.js
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/*
MIT License
Copyright (c) 2017 Pavel Dobryakov
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
'use strict'
import './dat.gui.min'
function ga() {
}
export default function (el, config) {
const canvas = el
resizeCanvas()
config = {
IMMEDIATE: true,
TRIGGER: 'hover',
AUTO: false,
INTERVAL: 3000,
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,
SPLAT_COUNT: Number.parseInt(Math.random() * 20) + 5,
SHADING: true,
COLORFUL: true,
COLOR_UPDATE_SPEED: 10,
PAUSED: false,
BACK_COLOR: { r: 0, g: 0, b: 0 },
TRANSPARENT: false,
BLOOM: true,
BLOOM_ITERATIONS: 8,
BLOOM_RESOLUTION: 256,
BLOOM_INTENSITY: 0.8,
BLOOM_THRESHOLD: 0.6,
BLOOM_SOFT_KNEE: 0.7,
SUNRAYS: true,
SUNRAYS_RESOLUTION: 196,
SUNRAYS_WEIGHT: 1.0,
...config,
}
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]
}
const pointers = []
const splatStack = []
const bloomFramebuffers = []
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: false, preserveDrawingBuffer: false }
let gl = canvas.getContext('webgl2', params)
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(0.0, 0.0, 0.0, 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)
}
ga('send', 'event', isWebGL2 ? 'webgl2' : 'webgl', formatRGBA ? 'supported' : 'not supported')
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) {
const 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)
const fbo = gl.createFramebuffer()
gl.bindFramebuffer(gl.FRAMEBUFFER, fbo)
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, 0)
const status = gl.checkFramebufferStatus(gl.FRAMEBUFFER)
return status === gl.FRAMEBUFFER_COMPLETE
}
/* function startGUI() {
const gui = new dat.GUI({ width: 300 })
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(Number.parseInt(Math.random() * 20) + 5)
},
}, 'fun').name('Random splats')
const 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')
const sunraysFolder = gui.addFolder('Sunrays')
sunraysFolder.add(config, 'SUNRAYS').name('enabled').onFinishChange(updateKeywords)
sunraysFolder.add(config, 'SUNRAYS_WEIGHT', 0.3, 1.0).name('weight')
const 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')
const 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'
const githubIcon = document.createElement('span')
github.domElement.parentElement.appendChild(githubIcon)
githubIcon.className = 'icon github'
const 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'
const twitterIcon = document.createElement('span')
twitter.domElement.parentElement.appendChild(twitterIcon)
twitterIcon.className = 'icon twitter'
const 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'
const discordIcon = document.createElement('span')
discord.domElement.parentElement.appendChild(discordIcon)
discordIcon.className = 'icon discord'
const 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'
const 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() {
const res = getResolution(config.CAPTURE_RESOLUTION)
const 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)
const captureCanvas = textureToCanvas(texture, target.width, target.height)
const datauri = captureCanvas.toDataURL()
downloadURI('fluid.png', datauri)
URL.revokeObjectURL(datauri)
} */
/* function framebufferToTexture(target) {
gl.bindFramebuffer(gl.FRAMEBUFFER, target.fbo)
const length = target.width * target.height * 4
const texture = new Float32Array(length)
gl.readPixels(0, 0, target.width, target.height, gl.RGBA, gl.FLOAT, texture)
return texture
} */
/* function normalizeTexture(texture, width, height) {
const result = new Uint8Array(texture.length)
let id = 0
for (let i = height - 1; i >= 0; i--) {
for (let j = 0; j < width; j++) {
const 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) {
const captureCanvas = document.createElement('canvas')
const ctx = captureCanvas.getContext('2d')
captureCanvas.width = width
captureCanvas.height = height
const imageData = ctx.createImageData(width, height)
imageData.data.set(texture)
ctx.putImageData(imageData, 0, 0)
return captureCanvas
} */
/* function downloadURI(filename, uri) {
const 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) {
const 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) {
const program = gl.createProgram()
gl.attachShader(program, vertexShader)
gl.attachShader(program, fragmentShader)
gl.linkProgram(program)
if (!gl.getProgramParameter(program, gl.LINK_STATUS)) {
throw gl.getProgramInfoLog(program)
}
return program
}
function getUniforms(program) {
const uniforms = []
const uniformCount = gl.getProgramParameter(program, gl.ACTIVE_UNIFORMS)
for (let i = 0; i < uniformCount; i++) {
const 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)) {
throw gl.getShaderInfoLog(shader)
}
return shader
}
function addKeywords(source, keywords) {
if (!keywords) {
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 mediump float;
precision mediump 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 mediump float;
precision mediump sampler2D;
varying highp vec2 vUv;
uniform sampler2D uTexture;
void main () {
gl_FragColor = texture2D(uTexture, vUv);
}
`)
const clearShader = compileShader(gl.FRAGMENT_SHADER, `
precision mediump float;
precision mediump 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 mediump float;
uniform vec4 color;
void main () {
gl_FragColor = color;
}
`)
const checkerboardShader = compileShader(gl.FRAGMENT_SHADER, config.TRANSPARENT
? `
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(0.0, 0.0, 0.0, 0.0);
}
`
: `
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 mediump float;
precision mediump 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 mediump float;
precision mediump 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 mediump float;
precision mediump 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 mediump float;
precision mediump 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 mediump float;
precision mediump 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 vel = texture2D(uVelocity, vUv).xy;
gl_FragColor = vec4(vel + force * dt, 0.0, 1.0);
}
`)
const pressureShader = compileShader(gl.FRAGMENT_SHADER, `
precision mediump float;
precision mediump 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 mediump float;
precision mediump 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 (destination) => {
gl.bindFramebuffer(gl.FRAMEBUFFER, destination)
gl.drawElements(gl.TRIANGLES, 6, gl.UNSIGNED_SHORT, 0)
}
})()
let dye
let velocity
let divergence
let curl
let pressure
let bloom
let sunrays
let sunraysTemp
const ditheringTexture = createTextureAsync()
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() {
const simRes = getResolution(config.SIM_RESOLUTION)
const 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
if (!dye) {
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) {
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() {
const 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++) {
const width = res.width >> (i + 1)
const height = res.height >> (i + 1)
if (width < 2 || height < 2) {
break
}
const fbo = createFBO(width, height, rgba.internalFormat, rgba.format, texType, filtering)
bloomFramebuffers.push(fbo)
}
}
function initSunraysFramebuffers() {
const 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)
const 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)
const 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)
const texelSizeX = 1.0 / w
const texelSizeY = 1.0 / h