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main.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.
*/
/*
MIT 许可证
Copyright (c) 2017 Pavel Dobryakov
在此授予获得此软件和相关文档文件（以下简称“软件”）副本的任何人免费许可，
以无限制方式处理软件，包括但不限于使用、复制、修改、合并、发布、分发、
再许可和/或销售软件副本的权利，并允许向其提供软件的人员这样做，但须遵守
以下条件：
上述版权声明和本许可声明应包含在软件的所有副本或重要部分中。
软件按“原样”提供，不作任何形式的保证，无论明示或暗示，包括但不限于适销
性、特定用途的适用性和不侵权性的保证。在任何情况下，作者或版权持有者均
不对因本软件或使用本软件或其他交易而引起的或与之相关的任何索赔、损害或
其他责任负责，无论是合同行为、侵权行为还是其他行为。
*/
'use strict';
const canvas = document.getElementsByTagName('canvas')[0];
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: 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,
SOUND_SENSITIVITY: 0.25,
FREQ_RANGE: 8,
}
var timer = setInterval(_randomSplats, 3500);
var _runRandom = true;
var _isSleep = false;
//lively is minimizing browser window to pause.
//this wont obviously work once I implement proper pause -> todo:- do not call livelyAudioListener() when paused/minimized.
document.addEventListener("visibilitychange", function() {
//alert(document.hidden+ " "+document.visibilityState);
_isSleep = document.hidden;
}, false);
let timeout;
let timeoutBool=true;
function livelyAudioListener(audioArray) {
if (audioArray[0] > 5 || _isSleep == true)
{
_runRandom = true;
return;
}
if(!_audioReact)
{
return;
}
if(audioArray[0]>0.1 && _runRandom){
_runRandom = false;
clearTimeout(timeout);
timeoutBool=true;
}
else{
if(!_runRandom && timeoutBool){
timeoutBool=false;
timeout=setTimeout(()=>_runRandom=timeoutBool=true,1500);
}
}
let bass = 0.0;
let half = Math.floor(audioArray.length / 2);
for (let i = 0; i <= config.FREQ_RANGE; i++) {
bass += audioArray[i];
bass += audioArray[half + i];
}
bass /= (config.FREQ_RANGE * 2);
multipleSplats(Math.floor((bass * config.SOUND_SENSITIVITY) * 10));
}
function multipleSplats (amount) {
for (let i = 0; i < amount; i++) {
const color = config.COLORFUL ? generateColor() : Object.assign({}, config.POINTER_COLOR.getRandom());
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);
const dy = 1000 * (Math.random() - 0.5);
splat(x, y, dx, dy, color);
}
}
function generateColor () {
let c = HSVtoRGB(Math.random(), 1.0, 1.0);
c.r *= 0.15;
c.g *= 0.15;
c.b *= 0.15;
return c;
}
var _randomSplats = false;
var _audioReact = false;
var _bgImageChk = false;
var _bgImagePath = "";
function livelyPropertyListener(name, val)
{
switch(name) {
case "quality":
switch(val){
case 0:
config.DYE_RESOLUTION = 1024;
break;
case 1:
config.DYE_RESOLUTION = 512;
break;
case 2:
config.DYE_RESOLUTION = 256;
break;
case 3:
config.DYE_RESOLUTION = 128;
break;
}
initFramebuffers();
break;
case "simResolution":
switch(val){
case 0:
config.SIM_RESOLUTION = 32;
break;
case 1:
config.SIM_RESOLUTION = 64;
break;
case 2:
config.SIM_RESOLUTION = 128;
break;
case 3:
config.SIM_RESOLUTION = 256;
break;
}
initFramebuffers();
break;
case "densityDiffusion":
config.DENSITY_DISSIPATION = val/10;
break;
case "velocityDiffusion":
config.VELOCITY_DISSIPATION = val/100;
break;
case "pressure":
config.PRESSURE = val/100;
break;
case "vorticity":
config.CURL = val;
break;
case "splatRadius":
config.SPLAT_RADIUS = val/100;
break;
case "shading":
config.SHADING = val;
updateKeywords();
break;
case "colorful":
config.COLORFUL = val;
break;
case "bloomEnable":
config.BLOOM = val;
updateKeywords();
break;
case "bloomIntensity":
config.BLOOM_INTENSITY = val/100;
break;
case "bloomThreshold":
config.BLOOM_THRESHOLD = val/100;
break;
case "sunRaysEnable":
config.SUNRAYS = val;
updateKeywords();
break;
case "sunRaysWeight":
config.SUNRAYS_WEIGHT = val/100;
break;
case "bgColor":
const tmp = hexToRgb(val);
config.BACK_COLOR.r = tmp.r;
config.BACK_COLOR.g = tmp.g;
config.BACK_COLOR.b = tmp.b;
break;
case "bgImgChk":
_bgImageChk = val;
config.TRANSPARENT = val;
if (_bgImageChk)
{
document.body.style.backgroundImage = "url(" + _bgImagePath.replace('\\', '/') + ")";
}
break;
case "imgSelect":
_bgImagePath = val;
if (_bgImageChk)
{
document.body.style.backgroundImage = "url(" + val.replace('\\', '/') + ")";
}
break;
case "randomSplats":
_randomSplats = val;
break;
case "audioReact":
_audioReact = val;
break;
}
}
function hexToRgb(hex) {
var result = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i.exec(hex);
return result ? {
r: parseInt(result[1], 16),
g: parseInt(result[2], 16),
b: parseInt(result[3], 16)
} : null;
}
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;
}
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);
}
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);
const status = gl.checkFramebufferStatus(gl.FRAMEBUFFER);
return status == gl.FRAMEBUFFER_COMPLETE;
}
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))
throw 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))
throw 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 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, `
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;