mirror of
https://github.com/PavelDoGreat/WebGL-Fluid-Simulation.git
synced 2025-10-04 01:41:53 +02:00
752 lines
34 KiB
JavaScript
752 lines
34 KiB
JavaScript
'use strict';
|
|
|
|
var canvas = document.getElementsByTagName('canvas')[0];
|
|
canvas.width = canvas.clientWidth;
|
|
canvas.height = canvas.clientHeight;
|
|
|
|
var config = {
|
|
SIM_RESOLUTION: 128,
|
|
DYE_RESOLUTION: 512,
|
|
DENSITY_DISSIPATION: 0.97,
|
|
VELOCITY_DISSIPATION: 0.98,
|
|
PRESSURE_DISSIPATION: 0.8,
|
|
PRESSURE_ITERATIONS: 20,
|
|
CURL: 30,
|
|
SPLAT_RADIUS: 0.5,
|
|
SHADING: true,
|
|
COLORFUL: true,
|
|
PAUSED: false,
|
|
BACK_COLOR: { r: 0, g: 0, b: 0 },
|
|
TRANSPARENT: false
|
|
}
|
|
|
|
<<<<<<< HEAD
|
|
function pointerPrototype () {
|
|
this.id = -1;
|
|
this.x = 0;
|
|
this.y = 0;
|
|
this.dx = 0;
|
|
this.dy = 0;
|
|
this.down = false;
|
|
this.moved = false;
|
|
this.color = [30, 0, 300];
|
|
}
|
|
|
|
=======
|
|
>>>>>>> 55000316cd78f2265594266de0b1ce450d88bc09
|
|
var pointers = [];
|
|
var splatStack = [];
|
|
pointers.push(new pointerPrototype());
|
|
|
|
var ref = getWebGLContext(canvas);
|
|
var gl = ref.gl;
|
|
var ext = ref.ext;
|
|
|
|
<<<<<<< HEAD
|
|
if (isMobile()) {
|
|
config.DYE_RESOLUTION = 256;
|
|
config.SHADING = false;
|
|
}
|
|
=======
|
|
if (isMobile())
|
|
{ config.DYE_RESOLUTION = 256; }
|
|
>>>>>>> 55000316cd78f2265594266de0b1ce450d88bc09
|
|
if (!ext.supportLinearFiltering)
|
|
{ config.SHADING = false; }
|
|
|
|
startGUI();
|
|
|
|
function getWebGLContext (canvas) {
|
|
var params = { alpha: true, depth: false, stencil: false, antialias: false, preserveDrawingBuffer: false };
|
|
|
|
var gl = canvas.getContext('webgl2', params);
|
|
var isWebGL2 = !!gl;
|
|
if (!isWebGL2)
|
|
{ gl = canvas.getContext('webgl', params) || canvas.getContext('experimental-webgl', params); }
|
|
|
|
var halfFloat;
|
|
var 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);
|
|
|
|
var halfFloatTexType = isWebGL2 ? gl.HALF_FLOAT : halfFloat.HALF_FLOAT_OES;
|
|
var formatRGBA;
|
|
var formatRG;
|
|
var 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);
|
|
}
|
|
|
|
if (formatRGBA == null)
|
|
{ ga('send', 'event', isWebGL2 ? 'webgl2' : 'webgl', 'not supported'); }
|
|
else
|
|
{ ga('send', 'event', isWebGL2 ? 'webgl2' : 'webgl', 'supported'); }
|
|
|
|
return {
|
|
gl: gl,
|
|
ext: {
|
|
formatRGBA: formatRGBA,
|
|
formatRG: formatRG,
|
|
formatR: formatR,
|
|
halfFloatTexType: halfFloatTexType,
|
|
supportLinearFiltering: 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: internalFormat,
|
|
format: format
|
|
}
|
|
}
|
|
|
|
function supportRenderTextureFormat (gl, internalFormat, format, type) {
|
|
var 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);
|
|
|
|
var fbo = gl.createFramebuffer();
|
|
gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
|
|
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, 0);
|
|
|
|
var status = gl.checkFramebufferStatus(gl.FRAMEBUFFER);
|
|
if (status != gl.FRAMEBUFFER_COMPLETE)
|
|
{ return false; }
|
|
return true;
|
|
}
|
|
|
|
function startGUI () {
|
|
var gui = new dat.GUI({ width: 300 });
|
|
gui.add(config, 'SIM_RESOLUTION', { '32': 32, '64': 64, '128': 128, '256': 256 }).name('sim resolution').onFinishChange(initFramebuffers);
|
|
gui.add(config, 'DYE_RESOLUTION', { '128': 128, '256': 256, '512': 512, '1024': 1024 }).name('dye resolution').onFinishChange(initFramebuffers);
|
|
gui.add(config, 'DENSITY_DISSIPATION', 0.9, 1.0).name('density diffusion');
|
|
gui.add(config, 'VELOCITY_DISSIPATION', 0.9, 1.0).name('velocity diffusion');
|
|
gui.add(config, 'PRESSURE_DISSIPATION', 0.0, 1.0).name('pressure diffusion');
|
|
// gui.add(config, 'PRESSURE_ITERATIONS', 1, 60).name('iterations');
|
|
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');
|
|
gui.add(config, 'COLORFUL').name('colorful');
|
|
gui.add(config, 'PAUSED').name('paused').listen();
|
|
|
|
gui.add({ fun: function () {
|
|
splatStack.push(parseInt(Math.random() * 20) + 5);
|
|
} }, 'fun').name('Random splats');
|
|
|
|
var 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');
|
|
|
|
var github = gui.add({ fun : function () {
|
|
window.open('https://github.com/PavelDoGreat/WebGL-Fluid-Simulation');
|
|
ga('send', 'event', 'link button', 'github');
|
|
} }, 'fun').name('Github');
|
|
github.__li.className = 'cr function bigFont';
|
|
github.__li.style.borderLeft = '3px solid #8C8C8C';
|
|
var githubIcon = document.createElement('span');
|
|
github.domElement.parentElement.appendChild(githubIcon);
|
|
githubIcon.className = 'icon github';
|
|
|
|
var twitter = gui.add({ fun : function () {
|
|
window.open('https://twitter.com/PavelDoGreat');
|
|
ga('send', 'event', 'link button', 'twitter');
|
|
} }, 'fun').name('Twitter');
|
|
twitter.__li.className = 'cr function bigFont';
|
|
twitter.__li.style.borderLeft = '3px solid #8C8C8C';
|
|
var twitterIcon = document.createElement('span');
|
|
twitter.domElement.parentElement.appendChild(twitterIcon);
|
|
twitterIcon.className = 'icon twitter';
|
|
|
|
var app = gui.add({ fun : function () {
|
|
window.open('http://onelink.to/5b58bn');
|
|
ga('send', 'event', 'link button', 'app');
|
|
} }, 'fun').name('Check out new improved version');
|
|
app.__li.className = 'cr function appBigFont';
|
|
app.__li.style.borderLeft = '3px solid #00FF7F';
|
|
var appIcon = document.createElement('span');
|
|
app.domElement.parentElement.appendChild(appIcon);
|
|
appIcon.className = 'icon app';
|
|
|
|
if (isMobile())
|
|
{ gui.close(); }
|
|
}
|
|
|
|
function CaptureScreenshot () {
|
|
colorProgram.bind();
|
|
gl.uniform4f(colorProgram.uniforms.color, 0, 0, 0, 1);
|
|
blit(density.write.fbo);
|
|
|
|
render(density.write.fbo);
|
|
gl.bindFramebuffer(gl.FRAMEBUFFER, density.write.fbo);
|
|
|
|
var length = dyeWidth * dyeHeight * 4;
|
|
var pixels = new Float32Array(length);
|
|
gl.readPixels(0, 0, dyeWidth, dyeHeight, gl.RGBA, gl.FLOAT, pixels);
|
|
|
|
var newPixels = new Uint8Array(length);
|
|
|
|
var id = 0;
|
|
for (var i = dyeHeight - 1; i >= 0; i--) {
|
|
for (var j = 0; j < dyeWidth; j++) {
|
|
var nid = i * dyeWidth * 4 + j * 4;
|
|
newPixels[nid + 0] = clamp01(pixels[id + 0]) * 255;
|
|
newPixels[nid + 1] = clamp01(pixels[id + 1]) * 255;
|
|
newPixels[nid + 2] = clamp01(pixels[id + 2]) * 255;
|
|
newPixels[nid + 3] = clamp01(pixels[id + 3]) * 255;
|
|
id += 4;
|
|
}
|
|
}
|
|
|
|
var captureCanvas = document.createElement('canvas');
|
|
var ctx = captureCanvas.getContext('2d');
|
|
captureCanvas.width = dyeWidth;
|
|
captureCanvas.height = dyeHeight;
|
|
|
|
var imageData = ctx.createImageData(dyeWidth, dyeHeight);
|
|
imageData.data.set(newPixels);
|
|
ctx.putImageData(imageData, 0, 0);
|
|
var datauri = captureCanvas.toDataURL();
|
|
|
|
downloadURI("fluid.png", datauri);
|
|
|
|
URL.revokeObjectURL(datauri);
|
|
}
|
|
|
|
function clamp01 (input) {
|
|
return Math.min(Math.max(input, 0), 1);
|
|
}
|
|
|
|
function downloadURI (filename, uri) {
|
|
var link = document.createElement("a");
|
|
link.download = filename;
|
|
link.href = uri;
|
|
document.body.appendChild(link);
|
|
link.click();
|
|
document.body.removeChild(link);
|
|
}
|
|
|
|
function isMobile () {
|
|
return /Mobi|Android/i.test(navigator.userAgent);
|
|
}
|
|
|
|
var GLProgram = function GLProgram (vertexShader, fragmentShader) {
|
|
var this$1 = this;
|
|
|
|
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); }
|
|
|
|
var uniformCount = gl.getProgramParameter(this.program, gl.ACTIVE_UNIFORMS);
|
|
for (var i = 0; i < uniformCount; i++) {
|
|
var uniformName = gl.getActiveUniform(this$1.program, i).name;
|
|
this$1.uniforms[uniformName] = gl.getUniformLocation(this$1.program, uniformName);
|
|
}
|
|
};
|
|
|
|
GLProgram.prototype.bind = function bind () {
|
|
gl.useProgram(this.program);
|
|
};
|
|
|
|
function compileShader (type, source) {
|
|
var shader = gl.createShader(type);
|
|
gl.shaderSource(shader, source);
|
|
gl.compileShader(shader);
|
|
|
|
if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS))
|
|
{ throw gl.getShaderInfoLog(shader); }
|
|
|
|
return shader;
|
|
};
|
|
|
|
var baseVertexShader = compileShader(gl.VERTEX_SHADER, "\n precision highp float;\n\n attribute vec2 aPosition;\n varying vec2 vUv;\n varying vec2 vL;\n varying vec2 vR;\n varying vec2 vT;\n varying vec2 vB;\n uniform vec2 texelSize;\n\n void main () {\n vUv = aPosition * 0.5 + 0.5;\n vL = vUv - vec2(texelSize.x, 0.0);\n vR = vUv + vec2(texelSize.x, 0.0);\n vT = vUv + vec2(0.0, texelSize.y);\n vB = vUv - vec2(0.0, texelSize.y);\n gl_Position = vec4(aPosition, 0.0, 1.0);\n }\n");
|
|
|
|
var clearShader = compileShader(gl.FRAGMENT_SHADER, "\n precision mediump float;\n precision mediump sampler2D;\n\n varying highp vec2 vUv;\n uniform sampler2D uTexture;\n uniform float value;\n\n void main () {\n gl_FragColor = value * texture2D(uTexture, vUv);\n }\n");
|
|
|
|
var colorShader = compileShader(gl.FRAGMENT_SHADER, "\n precision mediump float;\n\n uniform vec4 color;\n\n void main () {\n gl_FragColor = color;\n }\n");
|
|
|
|
var backgroundShader = compileShader(gl.FRAGMENT_SHADER, "\n precision highp float;\n precision highp sampler2D;\n\n varying vec2 vUv;\n uniform sampler2D uTexture;\n uniform float aspectRatio;\n\n #define SCALE 25.0\n\n void main () {\n vec2 uv = floor(vUv * SCALE * vec2(aspectRatio, 1.0));\n float v = mod(uv.x + uv.y, 2.0);\n v = v * 0.1 + 0.8;\n gl_FragColor = vec4(vec3(v), 1.0);\n }\n");
|
|
|
|
var displayShader = compileShader(gl.FRAGMENT_SHADER, "\n precision highp float;\n precision highp sampler2D;\n\n varying vec2 vUv;\n uniform sampler2D uTexture;\n\n void main () {\n vec3 C = texture2D(uTexture, vUv).rgb;\n float a = max(C.r, max(C.g, C.b));\n gl_FragColor = vec4(C, a);\n }\n");
|
|
|
|
var displayShadingShader = compileShader(gl.FRAGMENT_SHADER, "\n precision highp float;\n precision highp sampler2D;\n\n varying vec2 vUv;\n varying vec2 vL;\n varying vec2 vR;\n varying vec2 vT;\n varying vec2 vB;\n uniform sampler2D uTexture;\n uniform vec2 texelSize;\n\n void main () {\n vec3 L = texture2D(uTexture, vL).rgb;\n vec3 R = texture2D(uTexture, vR).rgb;\n vec3 T = texture2D(uTexture, vT).rgb;\n vec3 B = texture2D(uTexture, vB).rgb;\n vec3 C = texture2D(uTexture, vUv).rgb;\n\n float dx = length(R) - length(L);\n float dy = length(T) - length(B);\n\n vec3 n = normalize(vec3(dx, dy, length(texelSize)));\n vec3 l = vec3(0.0, 0.0, 1.0);\n\n float diffuse = clamp(dot(n, l) + 0.7, 0.7, 1.0);\n C.rgb *= diffuse;\n\n float a = max(C.r, max(C.g, C.b));\n gl_FragColor = vec4(C, a);\n }\n");
|
|
|
|
var splatShader = compileShader(gl.FRAGMENT_SHADER, "\n precision highp float;\n precision highp sampler2D;\n\n varying vec2 vUv;\n uniform sampler2D uTarget;\n uniform float aspectRatio;\n uniform vec3 color;\n uniform vec2 point;\n uniform float radius;\n\n void main () {\n vec2 p = vUv - point.xy;\n p.x *= aspectRatio;\n vec3 splat = exp(-dot(p, p) / radius) * color;\n vec3 base = texture2D(uTarget, vUv).xyz;\n gl_FragColor = vec4(base + splat, 1.0);\n }\n");
|
|
|
|
<<<<<<< HEAD
|
|
var advectionManualFilteringShader = compileShader(gl.FRAGMENT_SHADER, "\n precision highp float;\n precision highp sampler2D;\n\n varying vec2 vUv;\n uniform sampler2D uVelocity;\n uniform sampler2D uSource;\n uniform vec2 texelSize;\n uniform vec2 dyeTexelSize;\n uniform float dt;\n uniform float dissipation;\n\n vec4 bilerp (sampler2D sam, vec2 uv, vec2 tsize) {\n vec2 st = uv / tsize - 0.5;\n\n vec2 iuv = floor(st);\n vec2 fuv = fract(st);\n\n vec4 a = texture2D(sam, (iuv + vec2(0.5, 0.5)) * tsize);\n vec4 b = texture2D(sam, (iuv + vec2(1.5, 0.5)) * tsize);\n vec4 c = texture2D(sam, (iuv + vec2(0.5, 1.5)) * tsize);\n vec4 d = texture2D(sam, (iuv + vec2(1.5, 1.5)) * tsize);\n\n return mix(mix(a, b, fuv.x), mix(c, d, fuv.x), fuv.y);\n }\n\n void main () {\n vec2 coord = vUv - dt * bilerp(uVelocity, vUv, texelSize).xy * texelSize;\n gl_FragColor = dissipation * bilerp(uSource, coord, dyeTexelSize);\n gl_FragColor.a = 1.0;\n }\n");
|
|
=======
|
|
var advectionManualFilteringShader = compileShader(gl.FRAGMENT_SHADER, "\n precision highp float;\n precision mediump sampler2D;\n\n varying vec2 vUv;\n uniform sampler2D uVelocity;\n uniform sampler2D uSource;\n uniform vec2 texelSize;\n uniform vec2 dyeTexelSize;\n uniform float dt;\n uniform float dissipation;\n\n vec4 bilerp (in sampler2D sam, in vec2 uv, in vec2 tsize) {\n vec2 st = uv / tsize - 0.5;\n\n vec2 iuv = floor(st);\n vec2 fuv = fract(st);\n\n vec4 a = texture2D(sam, (iuv + vec2(0.5, 0.5)) * tsize);\n vec4 b = texture2D(sam, (iuv + vec2(1.5, 0.5)) * tsize);\n vec4 c = texture2D(sam, (iuv + vec2(0.5, 1.5)) * tsize);\n vec4 d = texture2D(sam, (iuv + vec2(1.5, 1.5)) * tsize);\n\n return mix(mix(a, b, fuv.x), mix(c, d, fuv.x), fuv.y);\n }\n\n void main () {\n vec2 coord = vUv - dt * bilerp(uVelocity, vUv, texelSize).xy * texelSize;\n gl_FragColor = dissipation * bilerp(uSource, coord, dyeTexelSize);\n gl_FragColor.a = 1.0;\n }\n");
|
|
>>>>>>> 55000316cd78f2265594266de0b1ce450d88bc09
|
|
|
|
var advectionShader = compileShader(gl.FRAGMENT_SHADER, "\n precision highp float;\n precision highp sampler2D;\n\n varying vec2 vUv;\n uniform sampler2D uVelocity;\n uniform sampler2D uSource;\n uniform vec2 texelSize;\n uniform float dt;\n uniform float dissipation;\n\n void main () {\n vec2 coord = vUv - dt * texture2D(uVelocity, vUv).xy * texelSize;\n gl_FragColor = dissipation * texture2D(uSource, coord);\n gl_FragColor.a = 1.0;\n }\n");
|
|
|
|
var divergenceShader = compileShader(gl.FRAGMENT_SHADER, "\n precision mediump float;\n precision mediump sampler2D;\n\n varying highp vec2 vUv;\n varying highp vec2 vL;\n varying highp vec2 vR;\n varying highp vec2 vT;\n varying highp vec2 vB;\n uniform sampler2D uVelocity;\n\n void main () {\n float L = texture2D(uVelocity, vL).x;\n float R = texture2D(uVelocity, vR).x;\n float T = texture2D(uVelocity, vT).y;\n float B = texture2D(uVelocity, vB).y;\n\n vec2 C = texture2D(uVelocity, vUv).xy;\n if (vL.x < 0.0) { L = -C.x; }\n if (vR.x > 1.0) { R = -C.x; }\n if (vT.y > 1.0) { T = -C.y; }\n if (vB.y < 0.0) { B = -C.y; }\n\n float div = 0.5 * (R - L + T - B);\n gl_FragColor = vec4(div, 0.0, 0.0, 1.0);\n }\n");
|
|
|
|
var curlShader = compileShader(gl.FRAGMENT_SHADER, "\n precision mediump float;\n precision mediump sampler2D;\n\n varying highp vec2 vUv;\n varying highp vec2 vL;\n varying highp vec2 vR;\n varying highp vec2 vT;\n varying highp vec2 vB;\n uniform sampler2D uVelocity;\n\n void main () {\n float L = texture2D(uVelocity, vL).y;\n float R = texture2D(uVelocity, vR).y;\n float T = texture2D(uVelocity, vT).x;\n float B = texture2D(uVelocity, vB).x;\n float vorticity = R - L - T + B;\n gl_FragColor = vec4(0.5 * vorticity, 0.0, 0.0, 1.0);\n }\n");
|
|
|
|
var vorticityShader = compileShader(gl.FRAGMENT_SHADER, "\n precision highp float;\n precision highp sampler2D;\n\n varying vec2 vUv;\n varying vec2 vL;\n varying vec2 vR;\n varying vec2 vT;\n varying vec2 vB;\n uniform sampler2D uVelocity;\n uniform sampler2D uCurl;\n uniform float curl;\n uniform float dt;\n\n void main () {\n float L = texture2D(uCurl, vL).x;\n float R = texture2D(uCurl, vR).x;\n float T = texture2D(uCurl, vT).x;\n float B = texture2D(uCurl, vB).x;\n float C = texture2D(uCurl, vUv).x;\n\n vec2 force = 0.5 * vec2(abs(T) - abs(B), abs(R) - abs(L));\n force /= length(force) + 0.0001;\n force *= curl * C;\n force.y *= -1.0;\n\n vec2 vel = texture2D(uVelocity, vUv).xy;\n gl_FragColor = vec4(vel + force * dt, 0.0, 1.0);\n }\n");
|
|
|
|
var pressureShader = compileShader(gl.FRAGMENT_SHADER, "\n precision mediump float;\n precision mediump sampler2D;\n\n varying highp vec2 vUv;\n varying highp vec2 vL;\n varying highp vec2 vR;\n varying highp vec2 vT;\n varying highp vec2 vB;\n uniform sampler2D uPressure;\n uniform sampler2D uDivergence;\n\n vec2 boundary (vec2 uv) {\n return uv;\n // uncomment if you use wrap or repeat texture mode\n // uv = min(max(uv, 0.0), 1.0);\n // return uv;\n }\n\n void main () {\n float L = texture2D(uPressure, boundary(vL)).x;\n float R = texture2D(uPressure, boundary(vR)).x;\n float T = texture2D(uPressure, boundary(vT)).x;\n float B = texture2D(uPressure, boundary(vB)).x;\n float C = texture2D(uPressure, vUv).x;\n float divergence = texture2D(uDivergence, vUv).x;\n float pressure = (L + R + B + T - divergence) * 0.25;\n gl_FragColor = vec4(pressure, 0.0, 0.0, 1.0);\n }\n");
|
|
|
|
var gradientSubtractShader = compileShader(gl.FRAGMENT_SHADER, "\n precision mediump float;\n precision mediump sampler2D;\n\n varying highp vec2 vUv;\n varying highp vec2 vL;\n varying highp vec2 vR;\n varying highp vec2 vT;\n varying highp vec2 vB;\n uniform sampler2D uPressure;\n uniform sampler2D uVelocity;\n\n vec2 boundary (vec2 uv) {\n return uv;\n // uv = min(max(uv, 0.0), 1.0);\n // return uv;\n }\n\n void main () {\n float L = texture2D(uPressure, boundary(vL)).x;\n float R = texture2D(uPressure, boundary(vR)).x;\n float T = texture2D(uPressure, boundary(vT)).x;\n float B = texture2D(uPressure, boundary(vB)).x;\n vec2 velocity = texture2D(uVelocity, vUv).xy;\n velocity.xy -= vec2(R - L, T - B);\n gl_FragColor = vec4(velocity, 0.0, 1.0);\n }\n");
|
|
|
|
var blit = (function () {
|
|
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 function (destination) {
|
|
gl.bindFramebuffer(gl.FRAMEBUFFER, destination);
|
|
gl.drawElements(gl.TRIANGLES, 6, gl.UNSIGNED_SHORT, 0);
|
|
}
|
|
})();
|
|
|
|
var simWidth;
|
|
var simHeight;
|
|
var dyeWidth;
|
|
var dyeHeight;
|
|
var density;
|
|
var velocity;
|
|
var divergence;
|
|
var curl;
|
|
var pressure;
|
|
|
|
var clearProgram = new GLProgram(baseVertexShader, clearShader);
|
|
var colorProgram = new GLProgram(baseVertexShader, colorShader);
|
|
var backgroundProgram = new GLProgram(baseVertexShader, backgroundShader);
|
|
var displayProgram = new GLProgram(baseVertexShader, displayShader);
|
|
var displayShadingProgram = new GLProgram(baseVertexShader, displayShadingShader);
|
|
var splatProgram = new GLProgram(baseVertexShader, splatShader);
|
|
var advectionProgram = new GLProgram(baseVertexShader, ext.supportLinearFiltering ? advectionShader : advectionManualFilteringShader);
|
|
var divergenceProgram = new GLProgram(baseVertexShader, divergenceShader);
|
|
var curlProgram = new GLProgram(baseVertexShader, curlShader);
|
|
var vorticityProgram = new GLProgram(baseVertexShader, vorticityShader);
|
|
var pressureProgram = new GLProgram(baseVertexShader, pressureShader);
|
|
var gradienSubtractProgram = new GLProgram(baseVertexShader, gradientSubtractShader);
|
|
|
|
function initFramebuffers () {
|
|
var simRes = getResolution(config.SIM_RESOLUTION);
|
|
var dyeRes = getResolution(config.DYE_RESOLUTION);
|
|
|
|
simWidth = simRes.width;
|
|
simHeight = simRes.height;
|
|
dyeWidth = dyeRes.width;
|
|
dyeHeight = dyeRes.height;
|
|
|
|
var texType = ext.halfFloatTexType;
|
|
var rgba = ext.formatRGBA;
|
|
var rg = ext.formatRG;
|
|
var r = ext.formatR;
|
|
|
|
density = createDoubleFBO(2, dyeWidth, dyeHeight, rgba.internalFormat, rgba.format, texType, ext.supportLinearFiltering ? gl.LINEAR : gl.NEAREST);
|
|
velocity = createDoubleFBO(0, simWidth, simHeight, rg.internalFormat, rg.format, texType, ext.supportLinearFiltering ? gl.LINEAR : gl.NEAREST);
|
|
divergence = createFBO (4, simWidth, simHeight, r.internalFormat, r.format, texType, gl.NEAREST);
|
|
curl = createFBO (5, simWidth, simHeight, r.internalFormat, r.format, texType, gl.NEAREST);
|
|
pressure = createDoubleFBO(6, simWidth, simHeight, r.internalFormat, r.format, texType, gl.NEAREST);
|
|
}
|
|
|
|
function getResolution (resolution) {
|
|
var aspectRatio = gl.drawingBufferWidth / gl.drawingBufferHeight;
|
|
if (aspectRatio < 1)
|
|
{ aspectRatio = 1.0 / aspectRatio; }
|
|
|
|
var max = Math.round(resolution * aspectRatio);
|
|
var min = Math.round(resolution);
|
|
|
|
if (gl.drawingBufferWidth > gl.drawingBufferHeight)
|
|
{ return { width: max, height: min }; }
|
|
else
|
|
{ return { width: min, height: max }; }
|
|
}
|
|
|
|
function createFBO (texId, w, h, internalFormat, format, type, param) {
|
|
gl.activeTexture(gl.TEXTURE0 + texId);
|
|
var texture = gl.createTexture();
|
|
gl.bindTexture(gl.TEXTURE_2D, texture);
|
|
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, param);
|
|
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, param);
|
|
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, w, h, 0, format, type, 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, w, h);
|
|
gl.clear(gl.COLOR_BUFFER_BIT);
|
|
|
|
return {
|
|
texture: texture,
|
|
fbo: fbo,
|
|
texId: texId
|
|
};
|
|
}
|
|
|
|
function createDoubleFBO (texId, w, h, internalFormat, format, type, param) {
|
|
var fbo1 = createFBO(texId , w, h, internalFormat, format, type, param);
|
|
var fbo2 = createFBO(texId + 1, w, h, internalFormat, format, type, param);
|
|
|
|
return {
|
|
get read () {
|
|
return fbo1;
|
|
},
|
|
get write () {
|
|
return fbo2;
|
|
},
|
|
swap: function swap () {
|
|
var temp = fbo1;
|
|
fbo1 = fbo2;
|
|
fbo2 = temp;
|
|
}
|
|
}
|
|
}
|
|
|
|
initFramebuffers();
|
|
multipleSplats(parseInt(Math.random() * 20) + 5);
|
|
|
|
var lastColorChangeTime = Date.now();
|
|
|
|
update();
|
|
|
|
function update () {
|
|
resizeCanvas();
|
|
input();
|
|
<<<<<<< HEAD
|
|
if (!config.PAUSED)
|
|
{ step(0.016); }
|
|
render(null);
|
|
=======
|
|
step(0.016);
|
|
render();
|
|
>>>>>>> 55000316cd78f2265594266de0b1ce450d88bc09
|
|
requestAnimationFrame(update);
|
|
}
|
|
|
|
function input () {
|
|
if (splatStack.length > 0)
|
|
{ multipleSplats(splatStack.pop()); }
|
|
|
|
for (var i = 0; i < pointers.length; i++) {
|
|
<<<<<<< HEAD
|
|
var p = pointers[i];
|
|
if (p.moved) {
|
|
splat(p.x, p.y, p.dx, p.dy, p.color);
|
|
p.moved = false;
|
|
}
|
|
}
|
|
|
|
if (!config.COLORFUL)
|
|
{ return; }
|
|
|
|
if (lastColorChangeTime + 100 < Date.now())
|
|
{
|
|
lastColorChangeTime = Date.now();
|
|
for (var i$1 = 0; i$1 < pointers.length; i$1++) {
|
|
var p$1 = pointers[i$1];
|
|
p$1.color = generateColor();
|
|
=======
|
|
var pointer = pointers[i];
|
|
if (pointer.moved) {
|
|
splat(pointer.x, pointer.y, pointer.dx, pointer.dy, pointer.color);
|
|
pointer.moved = false;
|
|
>>>>>>> 55000316cd78f2265594266de0b1ce450d88bc09
|
|
}
|
|
}
|
|
}
|
|
|
|
function step (dt) {
|
|
<<<<<<< HEAD
|
|
gl.disable(gl.BLEND);
|
|
=======
|
|
>>>>>>> 55000316cd78f2265594266de0b1ce450d88bc09
|
|
gl.viewport(0, 0, simWidth, simHeight);
|
|
|
|
curlProgram.bind();
|
|
gl.uniform2f(curlProgram.uniforms.texelSize, 1.0 / simWidth, 1.0 / simHeight);
|
|
gl.uniform1i(curlProgram.uniforms.uVelocity, velocity.read.texId);
|
|
blit(curl.fbo);
|
|
|
|
vorticityProgram.bind();
|
|
gl.uniform2f(vorticityProgram.uniforms.texelSize, 1.0 / simWidth, 1.0 / simHeight);
|
|
gl.uniform1i(vorticityProgram.uniforms.uVelocity, velocity.read.texId);
|
|
gl.uniform1i(vorticityProgram.uniforms.uCurl, curl.texId);
|
|
gl.uniform1f(vorticityProgram.uniforms.curl, config.CURL);
|
|
gl.uniform1f(vorticityProgram.uniforms.dt, dt);
|
|
blit(velocity.write.fbo);
|
|
velocity.swap();
|
|
|
|
divergenceProgram.bind();
|
|
gl.uniform2f(divergenceProgram.uniforms.texelSize, 1.0 / simWidth, 1.0 / simHeight);
|
|
gl.uniform1i(divergenceProgram.uniforms.uVelocity, velocity.read.texId);
|
|
blit(divergence.fbo);
|
|
|
|
clearProgram.bind();
|
|
var pressureTexId = pressure.read.texId;
|
|
gl.activeTexture(gl.TEXTURE0 + pressureTexId);
|
|
gl.bindTexture(gl.TEXTURE_2D, pressure.read.texture);
|
|
gl.uniform1i(clearProgram.uniforms.uTexture, pressureTexId);
|
|
gl.uniform1f(clearProgram.uniforms.value, config.PRESSURE_DISSIPATION);
|
|
blit(pressure.write.fbo);
|
|
pressure.swap();
|
|
|
|
pressureProgram.bind();
|
|
gl.uniform2f(pressureProgram.uniforms.texelSize, 1.0 / simWidth, 1.0 / simHeight);
|
|
gl.uniform1i(pressureProgram.uniforms.uDivergence, divergence.texId);
|
|
pressureTexId = pressure.read.texId;
|
|
gl.uniform1i(pressureProgram.uniforms.uPressure, pressureTexId);
|
|
gl.activeTexture(gl.TEXTURE0 + pressureTexId);
|
|
for (var i = 0; i < config.PRESSURE_ITERATIONS; i++) {
|
|
gl.bindTexture(gl.TEXTURE_2D, pressure.read.texture);
|
|
blit(pressure.write.fbo);
|
|
pressure.swap();
|
|
}
|
|
|
|
gradienSubtractProgram.bind();
|
|
gl.uniform2f(gradienSubtractProgram.uniforms.texelSize, 1.0 / simWidth, 1.0 / simHeight);
|
|
gl.uniform1i(gradienSubtractProgram.uniforms.uPressure, pressure.read.texId);
|
|
gl.uniform1i(gradienSubtractProgram.uniforms.uVelocity, velocity.read.texId);
|
|
blit(velocity.write.fbo);
|
|
velocity.swap();
|
|
|
|
advectionProgram.bind();
|
|
gl.uniform2f(advectionProgram.uniforms.texelSize, 1.0 / simWidth, 1.0 / simHeight);
|
|
if (!ext.supportLinearFiltering)
|
|
{ gl.uniform2f(advectionProgram.uniforms.dyeTexelSize, 1.0 / simWidth, 1.0 / simHeight); }
|
|
gl.uniform1i(advectionProgram.uniforms.uVelocity, velocity.read.texId);
|
|
gl.uniform1i(advectionProgram.uniforms.uSource, velocity.read.texId);
|
|
gl.uniform1f(advectionProgram.uniforms.dt, dt);
|
|
gl.uniform1f(advectionProgram.uniforms.dissipation, config.VELOCITY_DISSIPATION);
|
|
blit(velocity.write.fbo);
|
|
velocity.swap();
|
|
|
|
gl.viewport(0, 0, dyeWidth, dyeHeight);
|
|
<<<<<<< HEAD
|
|
|
|
if (!ext.supportLinearFiltering)
|
|
{ gl.uniform2f(advectionProgram.uniforms.dyeTexelSize, 1.0 / dyeWidth, 1.0 / dyeHeight); }
|
|
=======
|
|
if (!ext.supportLinearFiltering)
|
|
{ gl.uniform2f(advectionProgram.uniforms.dyeTexelSize, 1.0 / dyeWidth, 1.0 / dyeWidth); }
|
|
>>>>>>> 55000316cd78f2265594266de0b1ce450d88bc09
|
|
gl.uniform1i(advectionProgram.uniforms.uVelocity, velocity.read.texId);
|
|
gl.uniform1i(advectionProgram.uniforms.uSource, density.read.texId);
|
|
gl.uniform1f(advectionProgram.uniforms.dissipation, config.DENSITY_DISSIPATION);
|
|
blit(density.write.fbo);
|
|
density.swap();
|
|
}
|
|
|
|
function render (target) {
|
|
if (target == null || !config.TRANSPARENT) {
|
|
gl.blendFunc(gl.ONE, gl.ONE_MINUS_SRC_ALPHA);
|
|
gl.enable(gl.BLEND);
|
|
}
|
|
else {
|
|
gl.disable(gl.BLEND);
|
|
}
|
|
|
|
var width = target == null ? gl.drawingBufferWidth : dyeWidth;
|
|
var height = target == null ? gl.drawingBufferHeight : dyeHeight;
|
|
|
|
gl.viewport(0, 0, width, height);
|
|
|
|
if (!config.TRANSPARENT) {
|
|
colorProgram.bind();
|
|
var bc = config.BACK_COLOR;
|
|
gl.uniform4f(colorProgram.uniforms.color, bc.r / 255, bc.g / 255, bc.b / 255, 1);
|
|
blit(target);
|
|
}
|
|
|
|
if (target == null && config.TRANSPARENT) {
|
|
backgroundProgram.bind();
|
|
gl.uniform1f(backgroundProgram.uniforms.aspectRatio, canvas.width / canvas.height);
|
|
blit(null);
|
|
}
|
|
|
|
if (config.SHADING) {
|
|
displayShadingProgram.bind();
|
|
gl.uniform2f(displayShadingProgram.uniforms.texelSize, 1.0 / width, 1.0 / height);
|
|
gl.uniform1i(displayShadingProgram.uniforms.uTexture, density.read.texId);
|
|
}
|
|
else {
|
|
displayProgram.bind();
|
|
gl.uniform1i(displayProgram.uniforms.uTexture, density.read.texId);
|
|
}
|
|
|
|
blit(target);
|
|
}
|
|
|
|
function splat (x, y, dx, dy, color) {
|
|
gl.viewport(0, 0, simWidth, simHeight);
|
|
splatProgram.bind();
|
|
gl.uniform1i(splatProgram.uniforms.uTarget, velocity.read.texId);
|
|
gl.uniform1f(splatProgram.uniforms.aspectRatio, canvas.width / canvas.height);
|
|
gl.uniform2f(splatProgram.uniforms.point, x / canvas.width, 1.0 - y / canvas.height);
|
|
gl.uniform3f(splatProgram.uniforms.color, dx, -dy, 1.0);
|
|
gl.uniform1f(splatProgram.uniforms.radius, config.SPLAT_RADIUS / 100.0);
|
|
blit(velocity.write.fbo);
|
|
velocity.swap();
|
|
|
|
gl.viewport(0, 0, dyeWidth, dyeHeight);
|
|
gl.uniform1i(splatProgram.uniforms.uTarget, density.read.texId);
|
|
gl.uniform3f(splatProgram.uniforms.color, color.r, color.g, color.b);
|
|
blit(density.write.fbo);
|
|
density.swap();
|
|
}
|
|
|
|
function multipleSplats (amount) {
|
|
for (var i = 0; i < amount; i++) {
|
|
var color = generateColor();
|
|
color.r *= 10.0;
|
|
color.g *= 10.0;
|
|
color.b *= 10.0;
|
|
var x = canvas.width * Math.random();
|
|
var y = canvas.height * Math.random();
|
|
var dx = 1000 * (Math.random() - 0.5);
|
|
var dy = 1000 * (Math.random() - 0.5);
|
|
splat(x, y, dx, dy, color);
|
|
}
|
|
}
|
|
|
|
function resizeCanvas () {
|
|
if (canvas.width != canvas.clientWidth || canvas.height != canvas.clientHeight) {
|
|
canvas.width = canvas.clientWidth;
|
|
canvas.height = canvas.clientHeight;
|
|
initFramebuffers();
|
|
}
|
|
}
|
|
|
|
canvas.addEventListener('mousemove', function (e) {
|
|
pointers[0].moved = pointers[0].down;
|
|
pointers[0].dx = (e.offsetX - pointers[0].x) * 5.0;
|
|
pointers[0].dy = (e.offsetY - pointers[0].y) * 5.0;
|
|
pointers[0].x = e.offsetX;
|
|
pointers[0].y = e.offsetY;
|
|
});
|
|
|
|
canvas.addEventListener('touchmove', function (e) {
|
|
e.preventDefault();
|
|
var touches = e.targetTouches;
|
|
for (var i = 0; i < touches.length; i++) {
|
|
var pointer = pointers[i];
|
|
pointer.moved = pointer.down;
|
|
pointer.dx = (touches[i].pageX - pointer.x) * 8.0;
|
|
pointer.dy = (touches[i].pageY - pointer.y) * 8.0;
|
|
pointer.x = touches[i].pageX;
|
|
pointer.y = touches[i].pageY;
|
|
}
|
|
}, false);
|
|
|
|
canvas.addEventListener('mousedown', function () {
|
|
pointers[0].down = true;
|
|
pointers[0].color = generateColor();
|
|
});
|
|
|
|
canvas.addEventListener('touchstart', function (e) {
|
|
e.preventDefault();
|
|
var touches = e.targetTouches;
|
|
for (var i = 0; i < touches.length; i++) {
|
|
if (i >= pointers.length)
|
|
{ pointers.push(new pointerPrototype()); }
|
|
|
|
pointers[i].id = touches[i].identifier;
|
|
pointers[i].down = true;
|
|
pointers[i].x = touches[i].pageX;
|
|
pointers[i].y = touches[i].pageY;
|
|
pointers[i].color = generateColor();
|
|
}
|
|
});
|
|
|
|
window.addEventListener('mouseup', function () {
|
|
pointers[0].down = false;
|
|
});
|
|
|
|
window.addEventListener('touchend', function (e) {
|
|
var touches = e.changedTouches;
|
|
for (var i = 0; i < touches.length; i++)
|
|
{ for (var j = 0; j < pointers.length; j++)
|
|
{ if (touches[i].identifier == pointers[j].id)
|
|
{ pointers[j].down = false; } } }
|
|
});
|
|
|
|
window.addEventListener('keydown', function (e) {
|
|
if (e.key === 'p')
|
|
{ config.PAUSED = !config.PAUSED; }
|
|
});
|
|
|
|
function generateColor () {
|
|
var c = HSVtoRGB(Math.random(), 1.0, 1.0);
|
|
c.r *= 0.15;
|
|
c.g *= 0.15;
|
|
c.b *= 0.15;
|
|
return c;
|
|
}
|
|
|
|
function HSVtoRGB (h, s, v) {
|
|
var r, g, b, i, f, p, q, t;
|
|
i = Math.floor(h * 6);
|
|
f = h * 6 - i;
|
|
p = v * (1 - s);
|
|
q = v * (1 - f * s);
|
|
t = v * (1 - (1 - f) * s);
|
|
|
|
switch (i % 6) {
|
|
case 0: r = v, g = t, b = p; break;
|
|
case 1: r = q, g = v, b = p; break;
|
|
case 2: r = p, g = v, b = t; break;
|
|
case 3: r = p, g = q, b = v; break;
|
|
case 4: r = t, g = p, b = v; break;
|
|
case 5: r = v, g = p, b = q; break;
|
|
}
|
|
|
|
return {
|
|
r: r,
|
|
g: g,
|
|
b: b
|
|
};
|
|
} |