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<title>CodePen - WebGL liquid masking</title>
<style> html, body { p.texte3d { font-size: 40px; font-weight: bold; color: red; text-shadow: 17px 17px 6 #999, 23px 23px 9 #888, 77px 77px 0 #777, 100px 400px 0 #666, 5px 5px 0 #555, 6px 6px 0 #444, 7px 7px 0 #333, 8px 8px 0 #222, 9px 9px 0 #111, 10px 10px 0 #000;

coding. allday. every. day. is. my. life

font-family :highlighttext overflow: hidden; padding: 0; margin: 0; }top: 0; canvas { position:fixed; left: 0; width: 100%; height: 100%; } .content { position: fixed; top: 0; left: 0; width: 100%; height: 100vh; } img { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); height: 115%; width: auto; opacity: 0; } @media (min-aspect-ratio: 4/3) { img { height: auto; width: 100%; } } @media (max-aspect-ratio: 3/5) { img { left: 30%; } } .overlay { position: fixed; top: 50%; left: 30%; max-width: 50%; transform: translate(-50%, -50%); font-family: sans-serif; font-size: 10vh; font-weight: bold; pointer-events: none; text-transform: uppercase; } @media (max-aspect-ratio: 1/1) { .overlay { left: 50%; width: 90%; max-width: 90%; } } @media (max-aspect-ratio: 3/5) { .overlay { font-size: 5vh; } } </style>

3d

<script type="x-shader/x-fragment" id="vertShader"> precision highp float; attribute vec2 aPosition; varying vec2 vUv; varying vec2 vL; varying vec2 vR; varying vec2 vT; varying vec2 vB; uniform vec2 u_vertex_texel; void main () { vUv = aPosition * .5 + .5; vL = vUv - vec2(u_vertex_texel.x, 0.); vR = vUv + vec2(u_vertex_texel.x, 0.); vT = vUv + vec2(0., u_vertex_texel.y); vB = vUv - vec2(0., u_vertex_texel.y); gl_Position = vec4(aPosition, 0., 1.); } </script> <script type="x-shader/x-fragment" id="fragShaderAdvection"> precision highp float; precision highp sampler2D; varying vec2 vUv; uniform sampler2D u_velocity_txr; uniform sampler2D u_input_txr; uniform vec2 u_vertex_texel; uniform vec2 u_output_textel; uniform float u_dt; uniform float u_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 () { vec2 coord = vUv - u_dt * bilerp(u_velocity_txr, vUv, u_vertex_texel).xy * u_vertex_texel; gl_FragColor = u_dissipation * bilerp(u_input_txr, coord, u_output_textel); gl_FragColor.a = 1.; } </script> <script type="x-shader/x-fragment" id="fragShaderDivergence"> 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 u_velocity_txr; void main () { float L = texture2D(u_velocity_txr, vL).x; float R = texture2D(u_velocity_txr, vR).x; float T = texture2D(u_velocity_txr, vT).y; float B = texture2D(u_velocity_txr, vB).y; float div = .5 * (R - L + T - B); gl_FragColor = vec4(div, 0., 0., 1.); } </script> <script type="x-shader/x-fragment" id="fragShaderPressure"> 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 u_pressure_txr; uniform sampler2D u_divergence_txr; void main () { float L = texture2D(u_pressure_txr, vL).x; float R = texture2D(u_pressure_txr, vR).x; float T = texture2D(u_pressure_txr, vT).x; float B = texture2D(u_pressure_txr, vB).x; float C = texture2D(u_pressure_txr, vUv).x; float divergence = texture2D(u_divergence_txr, vUv).x; float pressure = (L + R + B + T - divergence) * 0.25; gl_FragColor = vec4(pressure, 0., 0., 1.); } </script> <script type="x-shader/x-fragment" id="fragShaderGradientSubtract"> 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 u_pressure_txr; uniform sampler2D u_velocity_txr; void main () { float L = texture2D(u_pressure_txr, vL).x; float R = texture2D(u_pressure_txr, vR).x; float T = texture2D(u_pressure_txr, vT).x; float B = texture2D(u_pressure_txr, vB).x; vec2 velocity = texture2D(u_velocity_txr, vUv).xy; velocity.xy -= vec2(R - L, T - B); gl_FragColor = vec4(velocity, 0., 1.); } </script> <script type="x-shader/x-fragment" id="fragShaderPoint"> precision highp float; precision highp sampler2D; varying vec2 vUv; uniform sampler2D u_input_txr; uniform float u_ratio; uniform vec3 u_point_value; uniform vec2 u_point; uniform float u_point_size; void main () { vec2 p = vUv - u_point.xy; p.x *= u_ratio; vec3 splat = pow(2., -dot(p, p) / u_point_size) * u_point_value; vec3 base = texture2D(u_input_txr, vUv).xyz; gl_FragColor = vec4(base + splat, 1.); } </script> <script type="x-shader/x-fragment" id="fragShaderDisplay"> precision highp float; precision highp sampler2D; varying vec2 vUv; uniform sampler2D u_output_texture; void main () { vec3 C = texture2D(u_output_texture, vUv).rgb; float a = max(C.r, max(C.g, C.b)); a = pow(.1 * a, .1); a = clamp(a, 0., 1.); gl_FragColor = vec4(1. - C, 1. - a); } </script> 
  <script id="rendered-js" >

const canvas = document.getElementsByTagName("canvas")[0]; const image = document.getElementsByTagName("img")[0]; canvas.width = canvas.clientWidth; canvas.height = canvas.clientHeight;

const params = { SIM_RESOLUTION: 128, DYE_RESOLUTION: 1024, DENSITY_DISSIPATION: 0.995, VELOCITY_DISSIPATION: 0.9, PRESSURE_ITERATIONS: 10, SPLAT_RADIUS: 3 / window.innerHeight, color: { r: 0.8, g: 0.5, b: 0.2 } };

const pointer = { x: 0.65 * window.innerWidth, y: 0.5 * window.innerHeight, dx: 0, dy: 0, moved: false, firstMove: false // for codepen preview }; window.setTimeout(() => { pointer.firstMove = true; }, 3000);

let prevTimestamp = Date.now();

const gl = canvas.getContext("webgl"); gl.getExtension("OES_texture_float");

let outputColor, velocity, divergence, pressure;

const vertexShader = createShader( document.getElementById("vertShader").innerHTML, gl.VERTEX_SHADER );

const splatProgram = createProgram("fragShaderPoint"); const divergenceProgram = createProgram("fragShaderDivergence"); const pressureProgram = createProgram("fragShaderPressure"); const gradientSubtractProgram = createProgram("fragShaderGradientSubtract"); const advectionProgram = createProgram("fragShaderAdvection"); const displayProgram = createProgram("fragShaderDisplay");

initFBOs(); render(); image.style.opacity = "1";

window.addEventListener("resize", () => { params.SPLAT_RADIUS = 5 / window.innerHeight; canvas.width = canvas.clientWidth; canvas.height = canvas.clientHeight; });

canvas.addEventListener("click", (e) => { pointer.dx = 10; pointer.dy = 10; pointer.x = e.pageX; pointer.y = e.pageY; pointer.firstMove = true; });

canvas.addEventListener("mousemove", (e) => { pointer.moved = true; pointer.dx = 5 * (e.pageX - pointer.x); pointer.dy = 5 * (e.pageY - pointer.y); pointer.x = e.pageX; pointer.y = e.pageY; pointer.firstMove = true; });

canvas.addEventListener("touchmove", (e) => { e.preventDefault(); pointer.moved = true; pointer.dx = 8 * (e.targetTouches[0].pageX - pointer.x); pointer.dy = 8 * (e.targetTouches[0].pageY - pointer.y); pointer.x = e.targetTouches[0].pageX; pointer.y = e.targetTouches[0].pageY; pointer.firstMove = true; });

function createProgram(elId) { const shader = createShader( document.getElementById(elId).innerHTML, gl.FRAGMENT_SHADER ); const program = createShaderProgram(vertexShader, shader); const uniforms = getUniforms(program); return { program, uniforms }; }

function createShaderProgram(vertexShader, fragmentShader) { const program = gl.createProgram(); gl.attachShader(program, vertexShader); gl.attachShader(program, fragmentShader); gl.linkProgram(program);

if (!gl.getProgramParameter(program, gl.LINK_STATUS)) {
	console.error(
		"Unable to initialize the shader program: " + gl.getProgramInfoLog(program)
	);
	return null;
}

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 createShader(sourceCode, type) { const shader = gl.createShader(type); gl.shaderSource(shader, sourceCode); gl.compileShader(shader);

if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
	console.error(
		"An error occurred compiling the shaders: " + gl.getShaderInfoLog(shader)
	);
	gl.deleteShader(shader);
	return null;
}

return shader;

}

function blit(target) { 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);

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);
}
gl.drawElements(gl.TRIANGLES, 6, gl.UNSIGNED_SHORT, 0);

}

function initFBOs() { const simRes = getResolution(params.SIM_RESOLUTION); const dyeRes = getResolution(params.DYE_RESOLUTION);

outputColor = createDoubleFBO(dyeRes.width, dyeRes.height);
velocity = createDoubleFBO(simRes.width, simRes.height);
divergence = createFBO(simRes.width, simRes.height, gl.RGB);
pressure = createDoubleFBO(simRes.width, simRes.height, gl.RGB);

}

function getResolution(resolution) { let aspectRatio = gl.drawingBufferWidth / gl.drawingBufferHeight; if (aspectRatio < 1) aspectRatio = 1 / aspectRatio;

let min = Math.round(resolution);
let max = Math.round(resolution * aspectRatio);

if (gl.drawingBufferWidth > gl.drawingBufferHeight)
	return { width: max, height: min };
else return { width: min, height: max };

}

function createFBO(w, h, type = gl.RGBA) { gl.activeTexture(gl.TEXTURE0);

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, type, w, h, 0, type, gl.FLOAT, 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);

return {
	fbo,
	width: w,
	height: h,
	attach(id) {
		gl.activeTexture(gl.TEXTURE0 + id);
		gl.bindTexture(gl.TEXTURE_2D, texture);
		return id;
	}
};

}

function createDoubleFBO(w, h, type) { let fbo1 = createFBO(w, h, type); let fbo2 = createFBO(w, h, type);

return {
	width: w,
	height: h,
	texelSizeX: 1 / w,
	texelSizeY: 1 / h,
	read: () => {
		return fbo1;
	},
	write: () => {
		return fbo2;
	},
	swap() {
		let temp = fbo1;
		fbo1 = fbo2;
		fbo2 = temp;
	}
};

}

function render() { const dt = (Date.now() - prevTimestamp) / 1000; prevTimestamp = Date.now();

if (!pointer.firstMove) {
	pointer.moved = true;
	const newX =
		(0.65 +
			0.2 * Math.cos(0.006 * prevTimestamp) * Math.sin(0.008 * prevTimestamp)) *
		window.innerWidth;
	const newY =
		(0.5 + 0.12 * Math.sin(0.01 * prevTimestamp)) * window.innerHeight;
	pointer.dx = 10 * (newX - pointer.x);
	pointer.dy = 10 * (newY - pointer.y);
	pointer.x = newX;
	pointer.y = newY;
}

if (pointer.moved) {
	pointer.moved = false;

	gl.useProgram(splatProgram.program);
	gl.uniform1i(splatProgram.uniforms.u_input_txr, velocity.read().attach(0));
	gl.uniform1f(splatProgram.uniforms.u_ratio, canvas.width / canvas.height);
	gl.uniform2f(
		splatProgram.uniforms.u_point,
		pointer.x / canvas.width,
		1 - pointer.y / canvas.height
	);
	gl.uniform3f(splatProgram.uniforms.u_point_value, pointer.dx, -pointer.dy, 1);
	gl.uniform1f(splatProgram.uniforms.u_point_size, params.SPLAT_RADIUS);

	blit(velocity.write());
	velocity.swap();

	gl.uniform1i(splatProgram.uniforms.u_input_txr, outputColor.read().attach(0));
	gl.uniform3f(
		splatProgram.uniforms.u_point_value,
		1 - params.color.r,
		1 - params.color.g,
		1 - params.color.b
	);
	blit(outputColor.write());
	outputColor.swap();
}

gl.useProgram(divergenceProgram.program);
gl.uniform2f(
	divergenceProgram.uniforms.u_vertex_texel,
	velocity.texelSizeX,
	velocity.texelSizeY
);
gl.uniform1i(
	divergenceProgram.uniforms.u_velocity_txr,
	velocity.read().attach(0)
);
blit(divergence);

gl.useProgram(pressureProgram.program);
gl.uniform2f(
	pressureProgram.uniforms.u_vertex_texel,
	velocity.texelSizeX,
	velocity.texelSizeY
);
gl.uniform1i(pressureProgram.uniforms.u_divergence_txr, divergence.attach(0));
for (let i = 0; i < params.PRESSURE_ITERATIONS; i++) {
	gl.uniform1i(
		pressureProgram.uniforms.u_pressure_txr,
		pressure.read().attach(1)
	);
	blit(pressure.write());
	pressure.swap();
}

gl.useProgram(gradientSubtractProgram.program);
gl.uniform2f(
	gradientSubtractProgram.uniforms.u_vertex_texel,
	velocity.texelSizeX,
	velocity.texelSizeY
);
gl.uniform1i(
	gradientSubtractProgram.uniforms.u_pressure_txr,
	pressure.read().attach(0)
);
gl.uniform1i(
	gradientSubtractProgram.uniforms.u_velocity_txr,
	velocity.read().attach(1)
);
blit(velocity.write());
velocity.swap();

gl.useProgram(advectionProgram.program);
gl.uniform2f(
	advectionProgram.uniforms.u_vertex_texel,
	velocity.texelSizeX,
	velocity.texelSizeY
);
gl.uniform2f(
	advectionProgram.uniforms.u_output_textel,
	velocity.texelSizeX,
	velocity.texelSizeY
);

gl.uniform1i(
	advectionProgram.uniforms.u_velocity_txr,
	velocity.read().attach(0)
);
gl.uniform1i(advectionProgram.uniforms.u_input_txr, velocity.read().attach(0));
gl.uniform1f(advectionProgram.uniforms.u_dt, dt);
gl.uniform1f(
	advectionProgram.uniforms.u_dissipation,
	params.VELOCITY_DISSIPATION
);
blit(velocity.write());
velocity.swap();

gl.uniform2f(
	advectionProgram.uniforms.u_output_textel,
	outputColor.texelSizeX,
	outputColor.texelSizeY
);
gl.uniform1i(
	advectionProgram.uniforms.u_velocity_txr,
	velocity.read().attach(0)
);
gl.uniform1i(
	advectionProgram.uniforms.u_input_txr,
	outputColor.read().attach(1)
);
gl.uniform1f(
	advectionProgram.uniforms.u_dissipation,
	params.DENSITY_DISSIPATION
);
blit(outputColor.write());
outputColor.swap();

gl.useProgram(displayProgram.program);
gl.uniform1i(
	displayProgram.uniforms.u_output_texture,
	outputColor.read().attach(0)
);
blit();

requestAnimationFrame(render);

} </script>

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