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index3.html
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<!DOCTYPE html>
<html lang="en" class="no-js">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Mouse Flowmap Deformation with OGL | Demo 3 | Codrops</title>
<meta name="description" content="Some demos to show how to use OGL's mouse flowmap for fluid image distortions." />
<meta name="keywords" content="webgl, ogl, flowmap, mouse, fluid, distortion, image, web development" />
<meta name="author" content="Codrops" />
<link rel="shortcut icon" href="favicon.ico" />
<link href="https://fonts.googleapis.com/css?family=Be+Vietnam:500&display=swap" rel="stylesheet">
<link rel="stylesheet" type="text/css" href="css/base.css" />
<script>
document.documentElement.className = "js";
var supportsCssVars = function() {
var e,
t = document.createElement("style");
return (
(t.innerHTML = "root: { --tmp-var: bold; }"),
document.head.appendChild(t),
(e = !!(
window.CSS &&
window.CSS.supports &&
window.CSS.supports("font-weight", "var(--tmp-var)")
)),
t.parentNode.removeChild(t),
e
);
};
supportsCssVars() ||
alert(
"Please view this demo in a modern browser that supports CSS Variables."
);
</script>
<!--script src="//tympanus.net/codrops/adpacks/analytics.js"></script-->
</head>
<body class="demo-3">
<main>
<div class="frame">
<div class="frame__title-wrap">
<h1 class="frame__title">Mouse Flowmap Deformation with OGL</h1>
<div class="frame__links">
<a href="https://tympanus.net/Tutorials/3DModelCustomizer/">Previous Demo</a>
<a href="https://tympanus.net/codrops/?p=43531">Article</a>
<!--a href="">GitHub</a-->
</div>
</div>
<div class="frame__demos">
<a href="index.html" class="frame__demo">demo 1</a>
<a href="index2.html" class="frame__demo">demo 2</a>
<a href="index3.html" class="frame__demo frame__demo--current">demo 3</a>
</div>
</div>
</main>
</body>
<script type="text/javascript" src="js/bundle.js"></script>
<script type="module">
let imgSize = [1600, 1200];
const vertex = `
attribute vec2 uv;
attribute vec2 position;
varying vec2 vUv;
void main() {
vUv = uv;
gl_Position = vec4(position, 0, 1);
}
`;
const fragment = `
precision highp float;
precision highp int;
uniform sampler2D tWater;
uniform sampler2D tFlow;
uniform float uTime;
varying vec2 vUv;
uniform vec4 res;
void main() {
// R and G values are velocity in the x and y direction
// B value is the velocity length
vec3 flow = texture2D(tFlow, vUv).rgb;
vec2 uv = .5 * gl_FragCoord.xy / res.xy ;
vec2 myUV = (uv - vec2(0.5))*res.zw + vec2(0.5);
myUV -= flow.xy * (0.15 * 0.5);
vec3 tex = texture2D(tWater, myUV).rgb;
gl_FragColor.rgb = vec3(tex.r, tex.g, tex.b);
gl_FragColor.a = tex.r;
}
`;
{
const renderer = new ogl.Renderer({
dpr: 2,
alpha: true,
premultipliedAlpha: true
});
const gl = renderer.gl;
gl.canvas.classList.add("demo3");
document.body.appendChild(gl.canvas);
const isTouchCapable = "ontouchstart" in window;
// Variable inputs to control flowmap
let aspect = 1;
const mouse = new ogl.Vec2(-1);
const velocity = new ogl.Vec2();
function resize() {
let a1, a2;
var imageAspect = imgSize[1] / imgSize[0];
if (window.innerHeight / window.innerWidth < imageAspect) {
a1 = 1;
a2 = window.innerHeight / window.innerWidth / imageAspect;
} else {
a1 = (window.innerWidth / window.innerHeight) * imageAspect;
a2 = 1;
}
mesh.program.uniforms.res.value = new ogl.Vec4(
window.innerWidth,
window.innerHeight,
a1,
a2
);
renderer.setSize(window.innerWidth, window.innerHeight);
aspect = window.innerWidth / window.innerHeight;
}
const flowmap = new ogl.Flowmap(gl, { falloff: 0.2, dissipation: 0.9 });
// Triangle that includes -1 to 1 range for 'position', and 0 to 1 range for 'uv'.
const geometry = new ogl.Geometry(gl, {
position: {
size: 2,
data: new Float32Array([-1, -1, 3, -1, -1, 3])
},
uv: { size: 2, data: new Float32Array([0, 0, 2, 0, 0, 2]) }
});
const texture = new ogl.Texture(gl, {
minFilter: gl.LINEAR,
magFilter: gl.LINEAR,
premultiplyAlpha: true
});
const img = new Image();
img.onload = () => (texture.image = img);
img.crossOrigin = "Anonymous";
if (isTouchCapable) {
img.src = "img/Alienation_mobile.svg";
imgSize = [800, 1000];
} else {
img.src = "img/Alienation.svg";
}
let a1, a2;
var imageAspect = imgSize[1] / imgSize[0];
if (window.innerHeight / window.innerWidth < imageAspect) {
a1 = 1;
a2 = window.innerHeight / window.innerWidth / imageAspect;
} else {
a1 = (window.innerWidth / window.innerHeight) * imageAspect;
a2 = 1;
}
const program = new ogl.Program(gl, {
vertex,
fragment,
uniforms: {
uTime: { value: 0 },
tWater: { value: texture },
res: {
value: new ogl.Vec4(window.innerWidth, window.innerHeight, a1, a2)
},
img: { value: new ogl.Vec2(imgSize[0], imgSize[1]) },
// Note that the uniform is applied without using an object and value property
// This is because the class alternates this texture between two render targets
// and updates the value property after each render.
tFlow: flowmap.uniform
}
});
const mesh = new ogl.Mesh(gl, { geometry, program });
window.addEventListener("resize", resize, false);
resize();
// Create handlers to get mouse position and velocity
// const isTouchCapable = "ontouchstart" in window;
if (isTouchCapable) {
window.addEventListener("touchstart", updateMouse, false);
window.addEventListener("touchmove", updateMouse, { passive: false });
} else {
window.addEventListener("mousemove", updateMouse, false);
}
let lastTime;
const lastMouse = new ogl.Vec2();
function updateMouse(e) {
e.preventDefault();
if (e.changedTouches && e.changedTouches.length) {
e.x = e.changedTouches[0].pageX;
e.y = e.changedTouches[0].pageY;
}
if (e.x === undefined) {
e.x = e.pageX;
e.y = e.pageY;
}
// Get mouse value in 0 to 1 range, with y flipped
mouse.set(e.x / gl.renderer.width, 1.0 - e.y / gl.renderer.height);
// Calculate velocity
if (!lastTime) {
// First frame
lastTime = performance.now();
lastMouse.set(e.x, e.y);
}
const deltaX = e.x - lastMouse.x;
const deltaY = e.y - lastMouse.y;
lastMouse.set(e.x, e.y);
let time = performance.now();
// Avoid dividing by 0
let delta = Math.max(10.4, time - lastTime);
lastTime = time;
velocity.x = deltaX / delta;
velocity.y = deltaY / delta;
// Flag update to prevent hanging velocity values when not moving
velocity.needsUpdate = true;
}
requestAnimationFrame(update);
function update(t) {
requestAnimationFrame(update);
// Reset velocity when mouse not moving
if (!velocity.needsUpdate) {
mouse.set(-1);
velocity.set(0);
}
velocity.needsUpdate = false;
// Update flowmap inputs
flowmap.aspect = aspect;
flowmap.mouse.copy(mouse);
// Ease velocity input, slower when fading out
flowmap.velocity.lerp(velocity, velocity.len ? 0.15 : 0.1);
flowmap.update();
program.uniforms.uTime.value = t * 0.01;
renderer.render({ scene: mesh });
}
}
</script>
</html>