diff --git a/landing-page-canvas-color/README.md b/landing-page-canvas-color/README.md
new file mode 100644
index 0000000..001884e
--- /dev/null
+++ b/landing-page-canvas-color/README.md
@@ -0,0 +1,4 @@
+# Canvas-color landing page
+A landing page that reacts to mouse-over events and produces rainbow-like collored colors
+
+
diff --git a/landing-page-canvas-color/function.js b/landing-page-canvas-color/function.js
new file mode 100644
index 0000000..d5ed062
--- /dev/null
+++ b/landing-page-canvas-color/function.js
@@ -0,0 +1,1239 @@
+'use strict';
+
+const canvas = document.getElementsByTagName('canvas')[0];
+resizeCanvas();
+
+let config = {
+ SIM_RESOLUTION: 128,
+ DYE_RESOLUTION: 1024,
+ CAPTURE_RESOLUTION: 512,
+ DENSITY_DISSIPATION: 2,
+ VELOCITY_DISSIPATION: 2,
+ PRESSURE: 0.8,
+ PRESSURE_ITERATIONS: 20,
+ CURL: 30,
+ SPLAT_RADIUS: 0.25,
+ SPLAT_FORCE: 6000,
+ SHADING: true,
+ COLORFUL: true,
+ COLOR_UPDATE_SPEED: 10,
+ PAUSED: false,
+ BACK_COLOR: { r: 0, g: 0, b: 0 },
+ TRANSPARENT: false,
+ BLOOM: true,
+ BLOOM_ITERATIONS: 8,
+ BLOOM_RESOLUTION: 256,
+ BLOOM_INTENSITY: 0.8,
+ BLOOM_THRESHOLD: 0.6,
+ BLOOM_SOFT_KNEE: 0.7
+}
+
+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 = [];
+let bloomFramebuffers = [];
+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;
+}
+
+// startGUI();
+
+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 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 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, keywords) {
+ if (keywords != null) {
+ let keywordsString = '';
+ keywords.forEach(keyword => {
+ keywordsString += '#define ' + keyword + '\n';
+ });
+ source = keywordsString + 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;
+};
+
+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 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 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;
+ 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 displayShader = compileShader(gl.FRAGMENT_SHADER, displayShaderSource);
+const displayBloomShader = compileShader(gl.FRAGMENT_SHADER, displayShaderSource, ['BLOOM']);
+const displayShadingShader = compileShader(gl.FRAGMENT_SHADER, displayShaderSource, ['SHADING']);
+const displayBloomShadingShader = compileShader(gl.FRAGMENT_SHADER, displayShaderSource, ['BLOOM', 'SHADING']);
+
+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 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;
+
+let ditheringTexture = createTextureAsync('');
+
+const copyProgram = new GLProgram(baseVertexShader, copyShader);
+const clearProgram = new GLProgram(baseVertexShader, clearShader);
+const colorProgram = new GLProgram(baseVertexShader, colorShader);
+const checkerboardProgram = new GLProgram(baseVertexShader, checkerboardShader);
+const displayProgram = new GLProgram(baseVertexShader, displayShader);
+const displayBloomProgram = new GLProgram(baseVertexShader, displayBloomShader);
+const displayShadingProgram = new GLProgram(baseVertexShader, displayShadingShader);
+const displayBloomShadingProgram = new GLProgram(baseVertexShader, displayBloomShadingShader);
+const bloomPrefilterProgram = new GLProgram(baseVertexShader, bloomPrefilterShader);
+const bloomBlurProgram = new GLProgram(baseVertexShader, bloomBlurShader);
+const bloomFinalProgram = new GLProgram(baseVertexShader, bloomFinalShader);
+const splatProgram = new GLProgram(baseVertexShader, splatShader);
+const advectionProgram = new GLProgram(baseVertexShader, advectionShader);
+const divergenceProgram = new GLProgram(baseVertexShader, divergenceShader);
+const curlProgram = new GLProgram(baseVertexShader, curlShader);
+const vorticityProgram = new GLProgram(baseVertexShader, vorticityShader);
+const pressureProgram = new GLProgram(baseVertexShader, pressureShader);
+const gradienSubtractProgram = new GLProgram(baseVertexShader, gradientSubtractShader);
+
+function initFramebuffers() {
+ let simRes = getResolution(config.SIM_RESOLUTION);
+ let dyeRes = getResolution(config.DYE_RESOLUTION);
+
+ const texType = ext.halfFloatTexType;
+ const rgba = ext.formatRGBA;
+ const rg = ext.formatRG;
+ const r = ext.formatR;
+ const filtering = ext.supportLinearFiltering ? gl.LINEAR : gl.NEAREST;
+
+ if (dye == null)
+ dye = createDoubleFBO(dyeRes.width, dyeRes.height, rgba.internalFormat, rgba.format, texType, filtering);
+ else
+ dye = resizeDoubleFBO(dye, dyeRes.width, dyeRes.height, rgba.internalFormat, rgba.format, texType, filtering);
+
+ if (velocity == null)
+ velocity = createDoubleFBO(simRes.width, simRes.height, rg.internalFormat, rg.format, texType, filtering);
+ else
+ velocity = resizeDoubleFBO(velocity, simRes.width, simRes.height, rg.internalFormat, rg.format, texType, filtering);
+
+ divergence = createFBO(simRes.width, simRes.height, r.internalFormat, r.format, texType, gl.NEAREST);
+ curl = createFBO(simRes.width, simRes.height, r.internalFormat, r.format, texType, gl.NEAREST);
+ pressure = createDoubleFBO(simRes.width, simRes.height, r.internalFormat, r.format, texType, gl.NEAREST);
+
+ initBloomFramebuffers();
+}
+
+function initBloomFramebuffers() {
+ let res = getResolution(config.BLOOM_RESOLUTION);
+
+ const texType = ext.halfFloatTexType;
+ const rgba = ext.formatRGBA;
+ const filtering = ext.supportLinearFiltering ? gl.LINEAR : gl.NEAREST;
+
+ bloom = createFBO(res.width, res.height, rgba.internalFormat, rgba.format, texType, filtering);
+
+ bloomFramebuffers.length = 0;
+ for (let i = 0; i < config.BLOOM_ITERATIONS; i++) {
+ let width = res.width >> (i + 1);
+ let height = res.height >> (i + 1);
+
+ if (width < 2 || height < 2) break;
+
+ let fbo = createFBO(width, height, rgba.internalFormat, rgba.format, texType, filtering);
+ bloomFramebuffers.push(fbo);
+ }
+}
+
+function createFBO(w, h, internalFormat, format, type, param) {
+ gl.activeTexture(gl.TEXTURE0);
+ let 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);
+
+ let 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,
+ fbo,
+ width: w,
+ height: h,
+ attach(id) {
+ gl.activeTexture(gl.TEXTURE0 + id);
+ gl.bindTexture(gl.TEXTURE_2D, texture);
+ return id;
+ }
+ };
+}
+
+function createDoubleFBO(w, h, internalFormat, format, type, param) {
+ let fbo1 = createFBO(w, h, internalFormat, format, type, param);
+ let fbo2 = createFBO(w, h, internalFormat, format, type, param);
+
+ let texelSizeX = 1.0 / w;
+ let texelSizeY = 1.0 / h;
+
+ return {
+ width: w,
+ height: h,
+ texelSizeX,
+ texelSizeY,
+ get read() {
+ return fbo1;
+ },
+ set read(value) {
+ fbo1 = value;
+ },
+ get write() {
+ return fbo2;
+ },
+ set write(value) {
+ fbo2 = value;
+ },
+ swap() {
+ let temp = fbo1;
+ fbo1 = fbo2;
+ fbo2 = temp;
+ }
+ }
+}
+
+function resizeFBO(target, w, h, internalFormat, format, type, param) {
+ let newFBO = createFBO(w, h, internalFormat, format, type, param);
+ copyProgram.bind();
+ gl.uniform1i(copyProgram.uniforms.uTexture, target.attach(0));
+ blit(newFBO.fbo);
+ return newFBO;
+}
+
+function resizeDoubleFBO(target, w, h, internalFormat, format, type, param) {
+ if (target.width == w && target.height == h)
+ return target;
+ target.read = resizeFBO(target.read, w, h, internalFormat, format, type, param);
+ target.write = createFBO(w, h, internalFormat, format, type, param);
+ target.width = w;
+ target.height = h;
+ target.texelSizeX = 1.0 / w;
+ target.texelSizeY = 1.0 / h;
+ return target;
+}
+
+function createTextureAsync(url) {
+ let 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.REPEAT);
+ gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT);
+ gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGB, 1, 1, 0, gl.RGB, gl.UNSIGNED_BYTE, new Uint8Array([255, 255, 255]));
+
+ let obj = {
+ texture,
+ width: 1,
+ height: 1,
+ attach(id) {
+ gl.activeTexture(gl.TEXTURE0 + id);
+ gl.bindTexture(gl.TEXTURE_2D, texture);
+ return id;
+ }
+ };
+
+ let image = new Image();
+ image.onload = () => {
+ obj.width = image.width;
+ obj.height = image.height;
+ gl.bindTexture(gl.TEXTURE_2D, texture);
+ gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGB, gl.RGB, gl.UNSIGNED_BYTE, image);
+ };
+ image.src = url;
+
+ return obj;
+}
+
+initFramebuffers();
+multipleSplats(parseInt(Math.random() * 20) + 5);
+
+let lastUpdateTime = Date.now();
+let colorUpdateTimer = 0.0;
+update();
+
+function update() {
+ const dt = calcDeltaTime();
+ if (resizeCanvas())
+ initFramebuffers();
+ updateColors(dt);
+ applyInputs();
+ if (!config.PAUSED)
+ step(dt);
+ render(null);
+ requestAnimationFrame(update);
+}
+
+function calcDeltaTime() {
+ let now = Date.now();
+ let dt = (now - lastUpdateTime) / 1000;
+ dt = Math.min(dt, 0.016666);
+ lastUpdateTime = now;
+ return dt;
+}
+
+function resizeCanvas() {
+ let width = scaleByPixelRatio(canvas.clientWidth);
+ let height = scaleByPixelRatio(canvas.clientHeight);
+ if (canvas.width != width || canvas.height != height) {
+ canvas.width = width;
+ canvas.height = height;
+ return true;
+ }
+ return false;
+}
+
+function updateColors(dt) {
+ if (!config.COLORFUL) return;
+
+ colorUpdateTimer += dt * config.COLOR_UPDATE_SPEED;
+ if (colorUpdateTimer >= 1) {
+ colorUpdateTimer = wrap(colorUpdateTimer, 0, 1);
+ pointers.forEach(p => {
+ p.color = generateColor();
+ });
+ }
+}
+
+function applyInputs() {
+ if (splatStack.length > 0)
+ multipleSplats(splatStack.pop());
+
+ pointers.forEach(p => {
+ if (p.moved) {
+ p.moved = false;
+ splatPointer(p);
+ }
+ });
+}
+
+function step(dt) {
+ gl.disable(gl.BLEND);
+ gl.viewport(0, 0, velocity.width, velocity.height);
+
+ curlProgram.bind();
+ gl.uniform2f(curlProgram.uniforms.texelSize, velocity.texelSizeX, velocity.texelSizeY);
+ gl.uniform1i(curlProgram.uniforms.uVelocity, velocity.read.attach(0));
+ blit(curl.fbo);
+
+ vorticityProgram.bind();
+ gl.uniform2f(vorticityProgram.uniforms.texelSize, velocity.texelSizeX, velocity.texelSizeY);
+ gl.uniform1i(vorticityProgram.uniforms.uVelocity, velocity.read.attach(0));
+ gl.uniform1i(vorticityProgram.uniforms.uCurl, curl.attach(1));
+ 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, velocity.texelSizeX, velocity.texelSizeY);
+ gl.uniform1i(divergenceProgram.uniforms.uVelocity, velocity.read.attach(0));
+ blit(divergence.fbo);
+
+ clearProgram.bind();
+ gl.uniform1i(clearProgram.uniforms.uTexture, pressure.read.attach(0));
+ gl.uniform1f(clearProgram.uniforms.value, config.PRESSURE);
+ blit(pressure.write.fbo);
+ pressure.swap();
+
+ pressureProgram.bind();
+ gl.uniform2f(pressureProgram.uniforms.texelSize, velocity.texelSizeX, velocity.texelSizeY);
+ gl.uniform1i(pressureProgram.uniforms.uDivergence, divergence.attach(0));
+ for (let i = 0; i < config.PRESSURE_ITERATIONS; i++) {
+ gl.uniform1i(pressureProgram.uniforms.uPressure, pressure.read.attach(1));
+ blit(pressure.write.fbo);
+ pressure.swap();
+ }
+
+ gradienSubtractProgram.bind();
+ gl.uniform2f(gradienSubtractProgram.uniforms.texelSize, velocity.texelSizeX, velocity.texelSizeY);
+ gl.uniform1i(gradienSubtractProgram.uniforms.uPressure, pressure.read.attach(0));
+ gl.uniform1i(gradienSubtractProgram.uniforms.uVelocity, velocity.read.attach(1));
+ blit(velocity.write.fbo);
+ velocity.swap();
+
+ advectionProgram.bind();
+ gl.uniform2f(advectionProgram.uniforms.texelSize, velocity.texelSizeX, velocity.texelSizeY);
+ if (!ext.supportLinearFiltering)
+ gl.uniform2f(advectionProgram.uniforms.dyeTexelSize, velocity.texelSizeX, velocity.texelSizeY);
+ let velocityId = velocity.read.attach(0);
+ gl.uniform1i(advectionProgram.uniforms.uVelocity, velocityId);
+ gl.uniform1i(advectionProgram.uniforms.uSource, velocityId);
+ gl.uniform1f(advectionProgram.uniforms.dt, dt);
+ gl.uniform1f(advectionProgram.uniforms.dissipation, config.VELOCITY_DISSIPATION);
+ blit(velocity.write.fbo);
+ velocity.swap();
+
+ gl.viewport(0, 0, dye.width, dye.height);
+
+ if (!ext.supportLinearFiltering)
+ gl.uniform2f(advectionProgram.uniforms.dyeTexelSize, dye.texelSizeX, dye.texelSizeY);
+ gl.uniform1i(advectionProgram.uniforms.uVelocity, velocity.read.attach(0));
+ gl.uniform1i(advectionProgram.uniforms.uSource, dye.read.attach(1));
+ gl.uniform1f(advectionProgram.uniforms.dissipation, config.DENSITY_DISSIPATION);
+ blit(dye.write.fbo);
+ dye.swap();
+}
+
+function render(target) {
+ if (config.BLOOM)
+ applyBloom(dye.read, bloom);
+
+ if (target == null || !config.TRANSPARENT) {
+ gl.blendFunc(gl.ONE, gl.ONE_MINUS_SRC_ALPHA);
+ gl.enable(gl.BLEND);
+ }
+ else {
+ gl.disable(gl.BLEND);
+ }
+
+ let width = target == null ? gl.drawingBufferWidth : target.width;
+ let height = target == null ? gl.drawingBufferHeight : target.height;
+ gl.viewport(0, 0, width, height);
+
+ let fbo = target == null ? null : target.fbo;
+ if (!config.TRANSPARENT)
+ drawColor(fbo, normalizeColor(config.BACK_COLOR));
+ if (target == null && config.TRANSPARENT)
+ drawCheckerboard(fbo);
+ drawDisplay(fbo, width, height);
+}
+
+function drawColor(fbo, color) {
+ colorProgram.bind();
+ gl.uniform4f(colorProgram.uniforms.color, color.r, color.g, color.b, 1);
+ blit(fbo);
+}
+
+function drawCheckerboard(fbo) {
+ checkerboardProgram.bind();
+ gl.uniform1f(checkerboardProgram.uniforms.aspectRatio, canvas.width / canvas.height);
+ blit(fbo);
+}
+
+function drawDisplay(fbo, width, height) {
+ let program = pickDisplayProgram();
+ program.bind();
+ if (config.SHADING)
+ gl.uniform2f(program.uniforms.texelSize, 1.0 / width, 1.0 / height);
+ gl.uniform1i(program.uniforms.uTexture, dye.read.attach(0));
+ if (config.BLOOM) {
+ gl.uniform1i(program.uniforms.uBloom, bloom.attach(1));
+ gl.uniform1i(program.uniforms.uDithering, ditheringTexture.attach(2));
+ let scale = getTextureScale(ditheringTexture, width, height);
+ gl.uniform2f(program.uniforms.ditherScale, scale.x, scale.y);
+ }
+ blit(fbo);
+}
+
+function pickDisplayProgram() {
+ if (config.SHADING) return config.BLOOM ? displayBloomShadingProgram : displayShadingProgram;
+ return config.BLOOM ? displayBloomProgram : displayProgram;
+}
+
+function applyBloom(source, destination) {
+ if (bloomFramebuffers.length < 2)
+ return;
+
+ let last = destination;
+
+ gl.disable(gl.BLEND);
+ bloomPrefilterProgram.bind();
+ let knee = config.BLOOM_THRESHOLD * config.BLOOM_SOFT_KNEE + 0.0001;
+ let curve0 = config.BLOOM_THRESHOLD - knee;
+ let curve1 = knee * 2;
+ let curve2 = 0.25 / knee;
+ gl.uniform3f(bloomPrefilterProgram.uniforms.curve, curve0, curve1, curve2);
+ gl.uniform1f(bloomPrefilterProgram.uniforms.threshold, config.BLOOM_THRESHOLD);
+ gl.uniform1i(bloomPrefilterProgram.uniforms.uTexture, source.attach(0));
+ gl.viewport(0, 0, last.width, last.height);
+ blit(last.fbo);
+
+ bloomBlurProgram.bind();
+ for (let i = 0; i < bloomFramebuffers.length; i++) {
+ let dest = bloomFramebuffers[i];
+ gl.uniform2f(bloomBlurProgram.uniforms.texelSize, 1.0 / last.width, 1.0 / last.height);
+ gl.uniform1i(bloomBlurProgram.uniforms.uTexture, last.attach(0));
+ gl.viewport(0, 0, dest.width, dest.height);
+ blit(dest.fbo);
+ last = dest;
+ }
+
+ gl.blendFunc(gl.ONE, gl.ONE);
+ gl.enable(gl.BLEND);
+
+ for (let i = bloomFramebuffers.length - 2; i >= 0; i--) {
+ let baseTex = bloomFramebuffers[i];
+ gl.uniform2f(bloomBlurProgram.uniforms.texelSize, 1.0 / last.width, 1.0 / last.height);
+ gl.uniform1i(bloomBlurProgram.uniforms.uTexture, last.attach(0));
+ gl.viewport(0, 0, baseTex.width, baseTex.height);
+ blit(baseTex.fbo);
+ last = baseTex;
+ }
+
+ gl.disable(gl.BLEND);
+ bloomFinalProgram.bind();
+ gl.uniform2f(bloomFinalProgram.uniforms.texelSize, 1.0 / last.width, 1.0 / last.height);
+ gl.uniform1i(bloomFinalProgram.uniforms.uTexture, last.attach(0));
+ gl.uniform1f(bloomFinalProgram.uniforms.intensity, config.BLOOM_INTENSITY);
+ gl.viewport(0, 0, destination.width, destination.height);
+ blit(destination.fbo);
+}
+
+function splatPointer(pointer) {
+ let dx = pointer.deltaX * config.SPLAT_FORCE;
+ let dy = pointer.deltaY * config.SPLAT_FORCE;
+ splat(pointer.texcoordX, pointer.texcoordY, dx, dy, pointer.color);
+}
+
+function multipleSplats(amount) {
+ for (let i = 0; i < amount; i++) {
+ const color = generateColor();
+ color.r *= 10.0;
+ color.g *= 10.0;
+ color.b *= 10.0;
+ const x = Math.random();
+ const y = Math.random();
+ const dx = 1000 * (Math.random() - 0.5);
+ const dy = 1000 * (Math.random() - 0.5);
+ splat(x, y, dx, dy, color);
+ }
+}
+
+function splat(x, y, dx, dy, color) {
+ gl.viewport(0, 0, velocity.width, velocity.height);
+ splatProgram.bind();
+ gl.uniform1i(splatProgram.uniforms.uTarget, velocity.read.attach(0));
+ gl.uniform1f(splatProgram.uniforms.aspectRatio, canvas.width / canvas.height);
+ gl.uniform2f(splatProgram.uniforms.point, x, y);
+ gl.uniform3f(splatProgram.uniforms.color, dx, dy, 0.0);
+ gl.uniform1f(splatProgram.uniforms.radius, correctRadius(config.SPLAT_RADIUS / 100.0));
+ blit(velocity.write.fbo);
+ velocity.swap();
+
+ gl.viewport(0, 0, dye.width, dye.height);
+ gl.uniform1i(splatProgram.uniforms.uTarget, dye.read.attach(0));
+ gl.uniform3f(splatProgram.uniforms.color, color.r, color.g, color.b);
+ blit(dye.write.fbo);
+ dye.swap();
+}
+
+function correctRadius(radius) {
+ let aspectRatio = canvas.width / canvas.height;
+ if (aspectRatio > 1)
+ radius *= aspectRatio;
+ return radius;
+}
+
+canvas.addEventListener('mousedown', e => {
+ let posX = scaleByPixelRatio(e.offsetX);
+ let posY = scaleByPixelRatio(e.offsetY);
+ updatePointerDownData(pointers[0], -1, posX, posY);
+});
+
+canvas.addEventListener('mousemove', e => {
+ let posX = scaleByPixelRatio(e.offsetX);
+ let posY = scaleByPixelRatio(e.offsetY);
+ updatePointerMoveData(pointers[0], posX, posY);
+});
+
+window.addEventListener('mouseup', () => {
+ updatePoinerUpData(pointers[0]);
+});
+
+canvas.addEventListener('touchstart', e => {
+ e.preventDefault();
+ const touches = e.targetTouches;
+ for (let i = 0; i < touches.length; i++) {
+ if (i >= pointers.length)
+ pointers.push(new pointerPrototype());
+ let posX = scaleByPixelRatio(touches[i].pageX);
+ let posY = scaleByPixelRatio(touches[i].pageY);
+ updatePointerDownData(pointers[i], touches[i].identifier, posX, posY);
+ }
+});
+
+canvas.addEventListener('touchmove', e => {
+ e.preventDefault();
+ const touches = e.targetTouches;
+ for (let i = 0; i < touches.length; i++) {
+ let posX = scaleByPixelRatio(touches[i].pageX);
+ let posY = scaleByPixelRatio(touches[i].pageY);
+ updatePointerMoveData(pointers[i], posX, posY);
+ }
+}, false);
+
+window.addEventListener('touchend', e => {
+ const touches = e.changedTouches;
+ for (let i = 0; i < touches.length; i++)
+ for (let j = 0; j < pointers.length; j++)
+ if (touches[i].identifier == pointers[j].id)
+ updatePoinerUpData(pointers[j]);
+});
+
+window.addEventListener('keydown', e => {
+ if (e.code === 'KeyP')
+ config.PAUSED = !config.PAUSED;
+ if (e.key === ' ')
+ splatStack.push(parseInt(Math.random() * 20) + 5);
+});
+
+function updatePointerDownData(pointer, id, posX, posY) {
+ pointer.id = id;
+ pointer.down = true;
+ pointer.moved = false;
+ pointer.texcoordX = posX / canvas.width;
+ pointer.texcoordY = 1.0 - posY / canvas.height;
+ pointer.prevTexcoordX = pointer.texcoordX;
+ pointer.prevTexcoordY = pointer.texcoordY;
+ pointer.deltaX = 0;
+ pointer.deltaY = 0;
+ pointer.color = generateColor();
+}
+
+function updatePointerMoveData(pointer, posX, posY) {
+ pointer.moved = pointer.down;
+ pointer.down = true;
+ pointer.prevTexcoordX = pointer.texcoordX;
+ pointer.prevTexcoordY = pointer.texcoordY;
+ pointer.texcoordX = posX / canvas.width;
+ pointer.texcoordY = 1.0 - posY / canvas.height;
+ pointer.deltaX = correctDeltaX(pointer.texcoordX - pointer.prevTexcoordX);
+ pointer.deltaY = correctDeltaY(pointer.texcoordY - pointer.prevTexcoordY);
+}
+
+function updatePoinerUpData(pointer) {
+ pointer.down = false;
+}
+
+function correctDeltaX(delta) {
+ let aspectRatio = canvas.width / canvas.height;
+ if (aspectRatio < 1) delta *= aspectRatio;
+ return delta;
+}
+
+function correctDeltaY(delta) {
+ let aspectRatio = canvas.width / canvas.height;
+ if (aspectRatio > 1) delta /= aspectRatio;
+ return delta;
+}
+
+function generateColor() {
+ let 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) {
+ let 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,
+ g,
+ b
+ };
+}
+
+function normalizeColor(input) {
+ let output = {
+ r: input.r / 255,
+ g: input.g / 255,
+ b: input.b / 255
+ };
+ return output;
+}
+
+function wrap(value, min, max) {
+ let range = max - min;
+ if (range == 0) return min;
+ return (value - min) % range + min;
+}
+
+function getResolution(resolution) {
+ let aspectRatio = gl.drawingBufferWidth / gl.drawingBufferHeight;
+ if (aspectRatio < 1)
+ aspectRatio = 1.0 / 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 getTextureScale(texture, width, height) {
+ return {
+ x: width / texture.width,
+ y: height / texture.height
+ };
+}
+
+function scaleByPixelRatio(input) {
+ let pixelRatio = window.devicePixelRatio || 1;
+ return Math.floor(input * pixelRatio);
+}
+
diff --git a/landing-page-canvas-color/index.html b/landing-page-canvas-color/index.html
new file mode 100644
index 0000000..366039b
--- /dev/null
+++ b/landing-page-canvas-color/index.html
@@ -0,0 +1,32 @@
+
+
+
+
+
+
+
+
+
+ Site title
+
+
+
+
+
+
+
+
+ Site title
+ This is a landing page
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/landing-page-canvas-color/sound.mp3 b/landing-page-canvas-color/sound.mp3
new file mode 100644
index 0000000..ba0343d
Binary files /dev/null and b/landing-page-canvas-color/sound.mp3 differ
diff --git a/landing-page-canvas-color/style.css b/landing-page-canvas-color/style.css
new file mode 100644
index 0000000..148b31e
--- /dev/null
+++ b/landing-page-canvas-color/style.css
@@ -0,0 +1,61 @@
+html, body {
+ overflow: hidden;
+ background-color: #000;
+}
+
+body {
+ margin: 0;
+ position: fixed;
+ width: 100%;
+ height: 100%;
+}
+
+canvas {
+ width: 100%;
+ height: 100%;
+}
+
+h2 {
+ padding: 0;
+ margin: 0;
+ color: white;
+ font-size: 50px;
+ position: absolute;
+ text-decoration: none;
+ display: block;
+ font-display: unset;
+ top: 50%;
+ left: 50%;
+ transform: translate(-50%, -50%);
+ font-family: 'Maven Pro', sans-serif;
+}
+
+h3 {
+ padding: 0;
+ margin: 0;
+ color: white;
+ font-size: 30px;
+ position: absolute;
+ text-decoration: none;
+ display: block;
+ font-display: unset;
+ top: 55%;
+ left: 50%;
+ transform: translate(-50%, -50%);
+ font-family: 'Maven Pro', sans-serif;
+}
+
+h4 {
+ padding: 0;
+ margin: 0;
+ color: white;
+ font-size: 20px;
+ position: absolute;
+ text-decoration: none;
+ display: block;
+ font-display: unset;
+ top: 58%;
+ left: 50%;
+ transform: translate(-50%, -50%);
+ font-family: 'Open Sans Condensed', sans-serif;
+}
\ No newline at end of file