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404.html
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<!-- 404.html -->
<!DOCTYPE html>
<html lang="en" oncontextmenu="return false;">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Hypercritical ✦ Lost ?</title>
<link fetchpriority="high" rel="preload" href="assets/svg/lion-eye-404.svg" as="image" />
<link fetchpriority="high" rel="preload" href="assets/svg/lion-404.svg" as="image" />
<link rel="stylesheet" href="css/404.css" />
</head>
<body oncontextmenu="return false">
<span id="not-found"></span>
<script crossorigin src="https://unpkg.com/react@18/umd/react.production.min.js"></script>
<script crossorigin src="https://unpkg.com/react-dom@18/umd/react-dom.production.min.js"></script>
<canvas></canvas>
<script>
window.ga =
window.ga ||
function () {
(ga.q = ga.q || []).push(arguments);
};
ga.l = +new Date();
ga("create", ":G-TDXEWBCNFH", "auto");
ga("send", "pageview");
</script>
<script>
"use strict";
const canvas = document.getElementsByTagName("canvas")[0];
resizeCanvas();
let config = {
SIM_RESOLUTION: 128,
DYE_RESOLUTION: 1024,
CAPTURE_RESOLUTION: 512,
DENSITY_DISSIPATION: 4,
VELOCITY_DISSIPATION: 0.2,
PRESSURE: 0.8,
PRESSURE_ITERATIONS: 20,
CURL: 10,
SPLAT_RADIUS: 0.5,
SPLAT_FORCE: 6000,
SHADING: false,
COLORFUL: true,
COLOR_UPDATE_SPEED: 10,
PAUSED: false,
BACK_COLOR: { r: 18, g: 19, b: 21 },
TRANSPARENT: false,
BLOOM: true,
BLOOM_ITERATIONS: 8,
BLOOM_RESOLUTION: 256,
BLOOM_INTENSITY: 0.4,
BLOOM_THRESHOLD: 0.6,
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(); to hide gui
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 == null ? "not supported" : "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) {
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 startGUI() {
var 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(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/uzi");
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)) 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;
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;