mirror_js/WebGL-Fluid-Simulation
1
0
Fork 0
mirror of https://github.com/PavelDoGreat/WebGL-Fluid-Simulation.git synced 2025-10-04 18:01:40 +02:00
Code Issues Releases Wiki Activity

wassup

Browse Source
This commit is contained in:
Pavel Dobryakov
2017-08-04 08:56:37 +03:00
commit ffb11bc3fb
2 changed files with 355 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
index.html Normal file
View File

@@ -0,0 +1,20 @@
<html>
<head>
<style>
body {
margin: 0;
overflow: hidden;
}
canvas {
position: absolute;
width: 100%;
height: 100%;
}
</style>
</head>
<body>
<canvas></canvas>
<script src="./script.js"></script>
</body>
</html>

335
script.js Normal file
View File

@@ -0,0 +1,335 @@
'use strict';
const canvas = document.getElementsByTagName('canvas')[0];
const gl = canvas.getContext('webgl') || canvas.getContext('experimental-webgl');
if (!gl.getExtension("OES_texture_float")) {
console.log("does not support OES_texture_float");
}
if (!gl.getExtension("OES_texture_float_linear")) {
console.log("does not support OES_texture_float_linear");
}
resizeCanvas();
class GLProgram {
constructor (vertexShader, fragmentShader) {
this.uniforms = {};
this.program = gl.createProgram();
gl.attachShader(this.program, vertexShader);
gl.attachShader(this.program, fragmentShader);
gl.linkProgram(this.program);
if (!gl.getProgramParameter(this.program, gl.LINK_STATUS)) {
throw gl.getProgramInfoLog(this.program);
}
const uniformCount = gl.getProgramParameter(this.program, gl.ACTIVE_UNIFORMS);
for (let i = 0; i < uniformCount; i++) {
const uniformName = gl.getActiveUniform(this.program, i).name;
this.uniforms[uniformName] = gl.getUniformLocation(this.program, uniformName);
}
}
bind () {
gl.useProgram(this.program);
}
}
function compileShader (type, source) {
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 createFBO (width, height) {
var texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
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);
const texData = new Uint8Array([
238, 95, 64, 255,
85, 74, 32, 255,
86, 39, 95, 255,
75, 37, 37, 255
]);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.FLOAT, null);
var fbo = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, 0);
gl.viewport(0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight);
gl.clearColor(0.0, 0.0, 0.0, 1.0);
gl.clear(gl.COLOR_BUFFER_BIT);
return [texture, fbo];
}
const blit = ((source, destination) => {
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.bindTexture(gl.TEXTURE_2D, source === null ? null : source[0]);
gl.bindFramebuffer(gl.FRAMEBUFFER, destination);
gl.drawElements(gl.TRIANGLES, 6, gl.UNSIGNED_SHORT, 0);
}
})();
let source = createFBO(gl.drawingBufferWidth, gl.drawingBufferHeight);
let source2 = createFBO(gl.drawingBufferWidth, gl.drawingBufferHeight);
let velocity = createFBO(gl.drawingBufferWidth, gl.drawingBufferHeight);
let velocity2 = createFBO(gl.drawingBufferWidth, gl.drawingBufferHeight);
let divergence = createFBO(gl.drawingBufferWidth, gl.drawingBufferHeight);
const vertexShader = compileShader(gl.VERTEX_SHADER, `
attribute vec2 aPosition;
varying vec2 vUv;
void main () {
vUv = aPosition * 0.5 + 0.5;
gl_Position = vec4(aPosition, 0.0, 1.0);
}
`);
const simpleFragmentShader = compileShader(gl.FRAGMENT_SHADER, `
precision highp float;
varying vec2 vUv;
uniform sampler2D uTexture;
void main () {
gl_FragColor = texture2D(uTexture, vUv);
}
`);
const simulationFragmentShader = compileShader(gl.FRAGMENT_SHADER, `
precision highp float;
varying vec2 vUv;
uniform sampler2D uTexture;
uniform vec2 uMouse;
void main () {
vec4 color = texture2D(uTexture, vUv);
// gl_FragColor = vec4(vUv.xy, uMouse.x, 1.0);// + color;
gl_FragColor = color + vec4(0.0, 0.005, 0.0, 0.0);
}
`);
const initSourceShader = compileShader(gl.FRAGMENT_SHADER, `
precision highp float;
varying vec2 vUv;
void main () {
float d = mod(floor(vUv.x * 10.0) + floor(vUv.y * 10.0), 2.0);
gl_FragColor = vec4(vec3(d), 1.0);
}
`);
const initVelocityShader = compileShader(gl.FRAGMENT_SHADER, `
precision highp float;
varying vec2 vUv;
void main () {
gl_FragColor = vec4(sin(6.28 * vUv.y), sin(6.28 * vUv.x), 0.0, 1.0);
}
`);
const advectionShader = compileShader(gl.FRAGMENT_SHADER, `
precision highp float;
varying vec2 vUv;
uniform sampler2D uVelocity;
uniform sampler2D uSource;
uniform vec2 wh_inv;
uniform float dt;
uniform float rdx;
uniform float dissipation;
void main () {
vec2 velocity = texture2D(uVelocity, vUv).xy;
vec2 back_pos = vUv - dt * rdx * velocity * wh_inv;
gl_FragColor = dissipation * texture2D(uSource, back_pos);
gl_FragColor.a = 1.0;
}
`);
const divergenceShader = compileShader(gl.FRAGMENT_SHADER, `
precision highp float;
varying vec2 vUv;
uniform sampler2D uVelocity;
uniform vec2 wh_inv;
uniform float halfrdx;
void main () {
vec2 T = texture2D(uVelocity, vUv + vec2(0.0, wh_inv.y)).xy;
vec2 B = texture2D(uVelocity, vUv - vec2(0.0, wh_inv.y)).xy;
vec2 R = texture2D(uVelocity, vUv + vec2(wh_inv.x, 0.0)).xy;
vec2 L = texture2D(uVelocity, vUv - vec2(wh_inv.x, 0.0)).xy;
//vec2 C = texture2D(uVelocity, vUv).xy;
float div = halfrdx * ((R.x - L.x) + (T.y - B.y));
gl_FragColor = vec4(div, 0.0, 0.0, 1.0);
}
`);
const pressureShader = compileShader(gl.FRAGMENT_SHADER, `
precision highp float;
varying vec2 vUv;
uniform sampler2D uPressure;
uniform sampler2D uDivergence;
uniform vec2 wh_inv;
uniform float alpha;
void main () {
float T = texture2D(uPressure, vUv + vec2(0.0, wh_inv.y)).x;
float B = texture2D(uPressure, vUv - vec2(0.0, wh_inv.y)).x;
float R = texture2D(uPressure, vUv + vec2(wh_inv.x, 0.0)).x;
float L = texture2D(uPressure, vUv - vec2(wh_inv.x, 0.0)).x;
float divergence = texture2D(uDivergence, vUv).x;
float pressure = (L + R + B + T + alpha * divergence) * .25;
gl_FragColor = vec4(pressure, 0.0, 0.0, 1.0);
}
`);
const gradientSubtractShader = compileShader(gl.FRAGMENT_SHADER, `
precision highp float;
varying vec2 vUv;
uniform sampler2D uPressure;
uniform sampler2D uVelocity;
uniform vec2 wh_inv;
uniform float halfrdx;
void main () {
float T = texture2D(uPressure, vUv + vec2(0.0, wh_inv.y)).x;
float B = texture2D(uPressure, vUv - vec2(0.0, wh_inv.y)).x;
float R = texture2D(uPressure, vUv + vec2(wh_inv.x, 0.0)).x;
float L = texture2D(uPressure, vUv - vec2(wh_inv.x, 0.0)).x;
vec2 velocity = texture2D(uVelocity, vUv).xy;
vec2 result = velocity - halfrdx * vec2(R - L, T - B);
gl_FragColor = vec4(result, 0.0, 1.0);
}
`);
const simpleProgram = new GLProgram(vertexShader, simpleFragmentShader);
const simulationProgram = new GLProgram(vertexShader, simulationFragmentShader);
const initSourceProgram = new GLProgram(vertexShader, initSourceShader);
const initVelocityProgram = new GLProgram(vertexShader, initVelocityShader);
const advectionProgram = new GLProgram(vertexShader, advectionShader);
const divergenceProgram = new GLProgram(vertexShader, divergenceShader);
let pointer = {
x: 0,
y: 0
}
gl.bindTexture(gl.TEXTURE_2D, null);
initSourceProgram.bind();
blit(source[1]);
initVelocityProgram.bind();
blit(velocity[1]);
Update();
function advect (target, dt) {
gl.activeTexture(gl.TEXTURE0 + 0);
gl.bindTexture(gl.TEXTURE_2D, velocity[0]);
gl.activeTexture(gl.TEXTURE0 + 1);
gl.bindTexture(gl.TEXTURE_2D, source[0]);
gl.bindFramebuffer(gl.FRAMEBUFFER, target[1]);
advectionProgram.bind();
gl.uniform1i(advectionProgram.uniforms.uVelocity, 0);
gl.uniform1i(advectionProgram.uniforms.uSource, 1);
gl.uniform2f(advectionProgram.uniforms.wh_inv, 1.0 / canvas.clientWidth, 1.0 / canvas.clientHeight);
gl.uniform1f(advectionProgram.uniforms.dt, dt);
gl.uniform1f(advectionProgram.uniforms.rdx, 1.0);
gl.uniform1f(advectionProgram.uniforms.dissipation, 1.0);
gl.drawElements(gl.TRIANGLES, 6, gl.UNSIGNED_SHORT, 0);
}
function Update () {
resizeCanvas();
// advect(source, 1.0);
gl.activeTexture(gl.TEXTURE0 + 0);
gl.bindTexture(gl.TEXTURE_2D, velocity[0]);
gl.activeTexture(gl.TEXTURE0 + 1);
gl.bindTexture(gl.TEXTURE_2D, source[0]);
advectionProgram.bind();
gl.uniform1i(advectionProgram.uniforms.uVelocity, 0);
gl.uniform1i(advectionProgram.uniforms.uSource, 1);
gl.uniform2f(advectionProgram.uniforms.wh_inv, 1.0 / canvas.clientWidth, 1.0 / canvas.clientHeight);
gl.uniform1f(advectionProgram.uniforms.dt, 1.0);
gl.uniform1f(advectionProgram.uniforms.rdx, 1.0);
gl.uniform1f(advectionProgram.uniforms.dissipation, 1.0);
blit(source2[1]);
// gl.activeTexture(gl.TEXTURE0 + 1);
// gl.bindTexture(gl.TEXTURE_2D, velocity[0]);
// blit(velocity2[1]);
gl.activeTexture(gl.TEXTURE0 + 0);
gl.bindTexture(gl.TEXTURE_2D, velocity2[0]);
divergenceProgram.bind();
gl.uniform1i(divergenceProgram.uniforms.uVelocity, 0);
gl.uniform2f(divergenceProgram.uniforms.wh_inv, 1.0 / canvas.clientWidth, 1.0 / canvas.clientHeight);
gl.uniform1f(divergenceProgram.uniforms.halfrdx, 0.5);
blit(divergence[1]);
gl.activeTexture(gl.TEXTURE0 + 0);
gl.bindTexture(gl.TEXTURE_2D, source[0]);
simpleProgram.bind();
blit(null);
let temp = source2;
source2 = source;
source = temp;
temp = velocity2;
velocity2 = velocity;
velocity = temp;
requestAnimationFrame(Update);
}
function resizeCanvas () {
if (canvas.width != canvas.clientWidth || canvas.height != canvas.clientHeight) {
const displayHeight = canvas.clientHeight;
canvas.width = canvas.clientWidth;
canvas.height = displayHeight;
}
}
window.addEventListener('mousemove', (e) => {
pointer.x = e.offsetX / canvas.width;
pointer.y = e.offsetY / canvas.height;
});