diff --git a/.DS_Store b/.DS_Store new file mode 100644 index 00000000..5008ddfc Binary files /dev/null and b/.DS_Store differ diff --git a/.github/FUNDING.yml b/.github/FUNDING.yml new file mode 100644 index 00000000..e2dac3b0 --- /dev/null +++ b/.github/FUNDING.yml @@ -0,0 +1,12 @@ +# These are supported funding model platforms + +github: # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2] +patreon: # Replace with a single Patreon username +open_collective: # Replace with a single Open Collective username +ko_fi: # Replace with a single Ko-fi username +tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel +community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry +liberapay: # Replace with a single Liberapay username +issuehunt: # Replace with a single IssueHunt username +otechie: # Replace with a single Otechie username +custom: ['https://play.google.com/store/apps/details?id=games.paveldogreat.fluidsimfree', 'https://apps.apple.com/app/fluid-simulation/id1443124993']# Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2'] diff --git a/LDR_LLL1_0.png b/LDR_LLL1_0.png new file mode 100644 index 00000000..d1920c63 Binary files /dev/null and b/LDR_LLL1_0.png differ diff --git a/README.md b/README.md index 7b94c5a9..9a692b93 100644 --- a/README.md +++ b/README.md @@ -1 +1,17 @@ -# WebGL-Fluid-Simulation \ No newline at end of file +# WebGL Fluid Simulation + +[Play here](https://paveldogreat.github.io/WebGL-Fluid-Simulation/) + + + +## References + +https://developer.nvidia.com/gpugems/gpugems/part-vi-beyond-triangles/chapter-38-fast-fluid-dynamics-simulation-gpu + +https://github.com/mharrys/fluids-2d + +https://github.com/haxiomic/GPU-Fluid-Experiments + +## License + +The code is available under the [MIT license](LICENSE) diff --git a/app_badge.png b/app_badge.png new file mode 100644 index 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Automatically save values to localStorage on exit.
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+
+
+
+ × +
+
+

Try Fluid Simulation app!

+
+ + Download on the App Store + + + Get it on Google Play + +
+
+
+
+
+ \ No newline at end of file diff --git a/logo.png b/logo.png index da7bbee5..a598ed1e 100644 Binary files a/logo.png and b/logo.png differ diff --git a/promo_back.png b/promo_back.png new file mode 100644 index 00000000..31dda3ed Binary files /dev/null and b/promo_back.png differ diff --git a/screenshot.jpg b/screenshot.jpg new file mode 100644 index 00000000..19311e37 Binary files /dev/null and b/screenshot.jpg differ diff --git a/script.js b/script.js index 1bc33a02..d0db5af6 100644 --- a/script.js +++ b/script.js @@ -1,96 +1,444 @@ +/* +MIT License + +Copyright (c) 2017 Pavel Dobryakov + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. +*/ + 'use strict'; -const canvas = document.getElementsByTagName('canvas')[0]; -canvas.width = canvas.clientWidth; -canvas.height = canvas.clientHeight; +// Mobile promo section -const params = { alpha: false, depth: false, stencil: false, antialias: false }; -let gl = canvas.getContext('webgl2', params); -const isWebGL2 = !!gl; -if (!isWebGL2) { - gl = canvas.getContext('webgl', params) || canvas.getContext('experimental-webgl', params); -} -gl.clearColor(0.0, 0.0, 0.0, 1.0); -gl.enable(gl.BLEND); +const promoPopup = document.getElementsByClassName('promo')[0]; +const promoPopupClose = document.getElementsByClassName('promo-close')[0]; -const halfFloat = gl.getExtension('OES_texture_half_float'); -let support_linear_float = gl.getExtension('OES_texture_half_float_linear'); -if (isWebGL2) { - gl.getExtension('EXT_color_buffer_float'); - support_linear_float = gl.getExtension('OES_texture_float_linear'); +if (isMobile()) { + setTimeout(() => { + promoPopup.style.display = 'table'; + }, 20000); } +promoPopupClose.addEventListener('click', e => { + promoPopup.style.display = 'none'; +}); + +const appleLink = document.getElementById('apple_link'); +appleLink.addEventListener('click', e => { + ga('send', 'event', 'link promo', 'app'); + window.open('https://apps.apple.com/us/app/fluid-simulation/id1443124993'); +}); + +const googleLink = document.getElementById('google_link'); +googleLink.addEventListener('click', e => { + ga('send', 'event', 'link promo', 'app'); + window.open('https://play.google.com/store/apps/details?id=games.paveldogreat.fluidsimfree'); +}); + +// Simulation section + +const canvas = document.getElementsByTagName('canvas')[0]; +resizeCanvas(); + let config = { - TEXTURE_DOWNSAMPLE: 1, - DENSITY_DISSIPATION: 0.98, - VELOCITY_DISSIPATION: 0.99, - PRESSURE_CONCENTRATION: 0.8, - PRESSURE_ITERATIONS: 25, + SIM_RESOLUTION: 128, + DYE_RESOLUTION: 1024, + CAPTURE_RESOLUTION: 512, + DENSITY_DISSIPATION: 1, + VELOCITY_DISSIPATION: 0.2, + PRESSURE: 0.8, + PRESSURE_ITERATIONS: 20, CURL: 30, - SPLAT_RADIUS: 0.005 -} - -var gui = new dat.GUI({ width: 270 }); -gui.add(config, 'TEXTURE_DOWNSAMPLE', { Full: 0, Half: 1, Quarter: 2 }).name('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_CONCENTRATION', 0.0, 1.0).name('jelly'); -gui.add(config, 'PRESSURE_ITERATIONS', 1, 60).name('iterations'); -gui.add(config, 'CURL', 0, 50).name('vorticity').step(1); -gui.add(config, 'SPLAT_RADIUS', 0.0001, 0.01).name('splat radius'); - -let github = gui.add({ fun : function () { window.open('https://github.com/PavelDoGreat/WebGL-Fluid-Simulation'); } }, 'fun').name('Github'); -github.__li.className = 'cr function bigFont'; -github.__li.style.borderLeft = '3px solid #8C8C8C'; -let githubIcon = document.createElement('span'); -github.domElement.parentElement.appendChild(githubIcon); -githubIcon.className = 'icon github'; - -let twitter = gui.add({ fun : function () { window.open('https://twitter.com/PavelDoGreat'); } }, 'fun').name('Twitter'); -twitter.__li.className = 'cr function bigFont'; -twitter.__li.style.borderLeft = '3px solid #8C8C8C'; -let twitterIcon = document.createElement('span'); -twitter.domElement.parentElement.appendChild(twitterIcon); -twitterIcon.className = 'icon twitter'; - -class GLProgram { - constructor (vertexShader, fragmentShader) { - this.uniforms = {}; - this.program = gl.createProgram(); + 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, + SUNRAYS: true, + SUNRAYS_RESOLUTION: 196, + SUNRAYS_WEIGHT: 1.0, +} + +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 = []; +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; + config.SUNRAYS = 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.attachShader(this.program, vertexShader); - gl.attachShader(this.program, fragmentShader); - gl.linkProgram(this.program); + gl.clearColor(0.0, 0.0, 0.0, 1.0); - if (!gl.getProgramParameter(this.program, gl.LINK_STATUS)) - throw gl.getProgramInfoLog(this.program); + const halfFloatTexType = isWebGL2 ? gl.HALF_FLOAT : halfFloat.HALF_FLOAT_OES; + let formatRGBA; + let formatRG; + let formatR; - 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); + 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); + + let status = gl.checkFramebufferStatus(gl.FRAMEBUFFER); + return status == gl.FRAMEBUFFER_COMPLETE; +} + +function startGUI () { + var gui = new dat.GUI({ width: 300 }); + gui.add(config, 'DYE_RESOLUTION', { 'high': 1024, 'medium': 512, 'low': 256, 'very low': 128 }).name('quality').onFinishChange(initFramebuffers); + gui.add(config, 'SIM_RESOLUTION', { '32': 32, '64': 64, '128': 128, '256': 256 }).name('sim resolution').onFinishChange(initFramebuffers); + gui.add(config, 'DENSITY_DISSIPATION', 0, 4.0).name('density diffusion'); + gui.add(config, 'VELOCITY_DISSIPATION', 0, 4.0).name('velocity diffusion'); + gui.add(config, 'PRESSURE', 0.0, 1.0).name('pressure'); + 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').onFinishChange(updateKeywords); + gui.add(config, 'COLORFUL').name('colorful'); + gui.add(config, 'PAUSED').name('paused').listen(); + + gui.add({ fun: () => { + splatStack.push(parseInt(Math.random() * 20) + 5); + } }, 'fun').name('Random splats'); + + let bloomFolder = gui.addFolder('Bloom'); + bloomFolder.add(config, 'BLOOM').name('enabled').onFinishChange(updateKeywords); + bloomFolder.add(config, 'BLOOM_INTENSITY', 0.1, 2.0).name('intensity'); + bloomFolder.add(config, 'BLOOM_THRESHOLD', 0.0, 1.0).name('threshold'); + + let sunraysFolder = gui.addFolder('Sunrays'); + sunraysFolder.add(config, 'SUNRAYS').name('enabled').onFinishChange(updateKeywords); + sunraysFolder.add(config, 'SUNRAYS_WEIGHT', 0.3, 1.0).name('weight'); + + let 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'); + + let github = gui.add({ fun : () => { + 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'; + let githubIcon = document.createElement('span'); + github.domElement.parentElement.appendChild(githubIcon); + githubIcon.className = 'icon github'; + + let twitter = gui.add({ fun : () => { + ga('send', 'event', 'link button', 'twitter'); + window.open('https://twitter.com/PavelDoGreat'); + } }, 'fun').name('Twitter'); + twitter.__li.className = 'cr function bigFont'; + twitter.__li.style.borderLeft = '3px solid #8C8C8C'; + let twitterIcon = document.createElement('span'); + twitter.domElement.parentElement.appendChild(twitterIcon); + twitterIcon.className = 'icon twitter'; + + let discord = gui.add({ fun : () => { + ga('send', 'event', 'link button', 'discord'); + window.open('https://discordapp.com/invite/CeqZDDE'); + } }, 'fun').name('Discord'); + discord.__li.className = 'cr function bigFont'; + discord.__li.style.borderLeft = '3px solid #8C8C8C'; + let discordIcon = document.createElement('span'); + discord.domElement.parentElement.appendChild(discordIcon); + discordIcon.className = 'icon discord'; + + let app = gui.add({ fun : () => { + ga('send', 'event', 'link button', 'app'); + window.open('http://onelink.to/5b58bn'); + } }, 'fun').name('Check out mobile app'); + app.__li.className = 'cr function appBigFont'; + app.__li.style.borderLeft = '3px solid #00FF7F'; + let appIcon = document.createElement('span'); + app.domElement.parentElement.appendChild(appIcon); + appIcon.className = 'icon app'; + + if (isMobile()) + gui.close(); +} + +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 Material { + constructor (vertexShader, fragmentShaderSource) { + this.vertexShader = vertexShader; + this.fragmentShaderSource = fragmentShaderSource; + this.programs = []; + this.activeProgram = null; + this.uniforms = []; + } + + setKeywords (keywords) { + let hash = 0; + for (let i = 0; i < keywords.length; i++) + hash += hashCode(keywords[i]); + + let program = this.programs[hash]; + if (program == null) + { + let fragmentShader = compileShader(gl.FRAGMENT_SHADER, this.fragmentShaderSource, keywords); + program = createProgram(this.vertexShader, fragmentShader); + this.programs[hash] = program; + } + + if (program == this.activeProgram) return; + + this.uniforms = getUniforms(program); + this.activeProgram = program; + } + + bind () { + gl.useProgram(this.activeProgram); + } +} + +class Program { + constructor (vertexShader, fragmentShader) { + this.uniforms = {}; + this.program = createProgram(vertexShader, fragmentShader); + this.uniforms = getUniforms(this.program); + } + bind () { gl.useProgram(this.program); } } -function compileShader (type, source) { +function createProgram (vertexShader, fragmentShader) { + let program = gl.createProgram(); + gl.attachShader(program, vertexShader); + gl.attachShader(program, fragmentShader); + gl.linkProgram(program); + + if (!gl.getProgramParameter(program, gl.LINK_STATUS)) + console.trace(gl.getProgramInfoLog(program)); + + 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 compileShader (type, source, keywords) { + source = addKeywords(source, keywords); + const shader = gl.createShader(type); gl.shaderSource(shader, source); gl.compileShader(shader); if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) - throw gl.getShaderInfoLog(shader); + console.trace(gl.getShaderInfoLog(shader)); return shader; }; +function addKeywords (source, keywords) { + if (keywords == null) return source; + let keywordsString = ''; + keywords.forEach(keyword => { + keywordsString += '#define ' + keyword + '\n'; + }); + return keywordsString + source; +} + const baseVertexShader = compileShader(gl.VERTEX_SHADER, ` precision highp float; - precision mediump sampler2D; attribute vec2 aPosition; varying vec2 vUv; @@ -110,11 +458,58 @@ const baseVertexShader = compileShader(gl.VERTEX_SHADER, ` } `); -const clearShader = compileShader(gl.FRAGMENT_SHADER, ` +const blurVertexShader = compileShader(gl.VERTEX_SHADER, ` precision highp float; + + attribute vec2 aPosition; + varying vec2 vUv; + varying vec2 vL; + varying vec2 vR; + uniform vec2 texelSize; + + void main () { + vUv = aPosition * 0.5 + 0.5; + float offset = 1.33333333; + vL = vUv - texelSize * offset; + vR = vUv + texelSize * offset; + gl_Position = vec4(aPosition, 0.0, 1.0); + } +`); + +const blurShader = compileShader(gl.FRAGMENT_SHADER, ` + precision mediump float; precision mediump sampler2D; varying vec2 vUv; + varying vec2 vL; + varying vec2 vR; + uniform sampler2D uTexture; + + void main () { + vec4 sum = texture2D(uTexture, vUv) * 0.29411764; + sum += texture2D(uTexture, vL) * 0.35294117; + sum += texture2D(uTexture, vR) * 0.35294117; + gl_FragColor = sum; + } +`); + +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; @@ -123,11 +518,122 @@ const clearShader = compileShader(gl.FRAGMENT_SHADER, ` } `); -const displayShader = compileShader(gl.FRAGMENT_SHADER, ` +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 uSunrays; + 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; + #endif + + #ifdef SUNRAYS + float sunrays = texture2D(uSunrays, vUv).r; + c *= sunrays; + #ifdef BLOOM + bloom *= sunrays; + #endif + #endif + + #ifdef BLOOM + 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 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; @@ -135,13 +641,91 @@ const displayShader = compileShader(gl.FRAGMENT_SHADER, ` uniform sampler2D uTexture; void main () { - gl_FragColor = texture2D(uTexture, vUv); + 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 sunraysMaskShader = compileShader(gl.FRAGMENT_SHADER, ` + precision highp float; + precision highp sampler2D; + + varying vec2 vUv; + uniform sampler2D uTexture; + + void main () { + vec4 c = texture2D(uTexture, vUv); + float br = max(c.r, max(c.g, c.b)); + c.a = 1.0 - min(max(br * 20.0, 0.0), 0.8); + gl_FragColor = c; + } +`); + +const sunraysShader = compileShader(gl.FRAGMENT_SHADER, ` + precision highp float; + precision highp sampler2D; + + varying vec2 vUv; + uniform sampler2D uTexture; + uniform float weight; + + #define ITERATIONS 16 + + void main () { + float Density = 0.3; + float Decay = 0.95; + float Exposure = 0.7; + + vec2 coord = vUv; + vec2 dir = vUv - 0.5; + + dir *= 1.0 / float(ITERATIONS) * Density; + float illuminationDecay = 1.0; + + float color = texture2D(uTexture, vUv).a; + + for (int i = 0; i < ITERATIONS; i++) + { + coord -= dir; + float col = texture2D(uTexture, coord).a; + color += col * illuminationDecay * weight; + illuminationDecay *= Decay; + } + + gl_FragColor = vec4(color * Exposure, 0.0, 0.0, 1.0); } `); const splatShader = compileShader(gl.FRAGMENT_SHADER, ` precision highp float; - precision mediump sampler2D; + precision highp sampler2D; varying vec2 vUv; uniform sampler2D uTarget; @@ -159,93 +743,83 @@ const splatShader = compileShader(gl.FRAGMENT_SHADER, ` } `); -const advectionManualFilteringShader = compileShader(gl.FRAGMENT_SHADER, ` +const advectionShader = compileShader(gl.FRAGMENT_SHADER, ` precision highp float; - precision mediump sampler2D; + 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 (in sampler2D sam, in vec2 p) { - vec4 st; - st.xy = floor(p - 0.5) + 0.5; - st.zw = st.xy + 1.0; - vec4 uv = st * texelSize.xyxy; - vec4 a = texture2D(sam, uv.xy); - vec4 b = texture2D(sam, uv.zy); - vec4 c = texture2D(sam, uv.xw); - vec4 d = texture2D(sam, uv.zw); - vec2 f = p - st.xy; - return mix(mix(a, b, f.x), mix(c, d, f.x), f.y); - } + vec4 bilerp (sampler2D sam, vec2 uv, vec2 tsize) { + vec2 st = uv / tsize - 0.5; - void main () { - vec2 coord = gl_FragCoord.xy - dt * texture2D(uVelocity, vUv).xy; - gl_FragColor = dissipation * bilerp(uSource, coord); - gl_FragColor.a = 1.0; - } -`); + vec2 iuv = floor(st); + vec2 fuv = fract(st); -const advectionShader = compileShader(gl.FRAGMENT_SHADER, ` - precision highp float; - precision mediump sampler2D; + 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); - varying vec2 vUv; - uniform sampler2D uVelocity; - uniform sampler2D uSource; - uniform vec2 texelSize; - uniform float dt; - uniform float dissipation; + 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; - gl_FragColor = dissipation * texture2D(uSource, coord); - } -`); + 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 highp float; + precision mediump float; precision mediump sampler2D; - varying vec2 vUv; - varying vec2 vL; - varying vec2 vR; - varying vec2 vT; - varying vec2 vB; + varying highp vec2 vUv; + varying highp vec2 vL; + varying highp vec2 vR; + varying highp vec2 vT; + varying highp vec2 vB; uniform sampler2D uVelocity; - vec2 sampleVelocity (in vec2 uv) { - vec2 multiplier = vec2(1.0, 1.0); - if (uv.x < 0.0) { uv.x = 0.0; multiplier.x = -1.0; } - if (uv.x > 1.0) { uv.x = 1.0; multiplier.x = -1.0; } - if (uv.y < 0.0) { uv.y = 0.0; multiplier.y = -1.0; } - if (uv.y > 1.0) { uv.y = 1.0; multiplier.y = -1.0; } - return multiplier * texture2D(uVelocity, uv).xy; - } - void main () { - float L = sampleVelocity(vL).x; - float R = sampleVelocity(vR).x; - float T = sampleVelocity(vT).y; - float B = sampleVelocity(vB).y; + 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 highp float; + precision mediump float; precision mediump sampler2D; - varying vec2 vUv; - varying vec2 vL; - varying vec2 vR; - varying vec2 vT; - varying vec2 vB; + 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 () { @@ -254,13 +828,13 @@ const curlShader = compileShader(gl.FRAGMENT_SHADER, ` float T = texture2D(uVelocity, vT).x; float B = texture2D(uVelocity, vB).x; float vorticity = R - L - T + B; - gl_FragColor = vec4(vorticity, 0.0, 0.0, 1.0); + gl_FragColor = vec4(0.5 * vorticity, 0.0, 0.0, 1.0); } `); const vorticityShader = compileShader(gl.FRAGMENT_SHADER, ` precision highp float; - precision mediump sampler2D; + precision highp sampler2D; varying vec2 vUv; varying vec2 vL; @@ -273,40 +847,41 @@ const vorticityShader = compileShader(gl.FRAGMENT_SHADER, ` uniform float dt; void main () { - float L = texture2D(uCurl, vL).y; - float R = texture2D(uCurl, vR).y; + 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 = vec2(abs(T) - abs(B), abs(R) - abs(L)); - force *= 1.0 / length(force + 0.00001) * curl * C; - vec2 vel = texture2D(uVelocity, vUv).xy; - gl_FragColor = vec4(vel + force * dt, 0.0, 1.0); + + 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 velocity = texture2D(uVelocity, vUv).xy; + velocity += force * dt; + velocity = min(max(velocity, -1000.0), 1000.0); + gl_FragColor = vec4(velocity, 0.0, 1.0); } `); const pressureShader = compileShader(gl.FRAGMENT_SHADER, ` - precision highp float; + precision mediump float; precision mediump sampler2D; - varying vec2 vUv; - varying vec2 vL; - varying vec2 vR; - varying vec2 vT; - varying vec2 vB; + 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; - vec2 boundary (in vec2 uv) { - uv = min(max(uv, 0.0), 1.0); - return uv; - } - void main () { - float L = texture2D(uPressure, boundary(vL)).x; - float R = texture2D(uPressure, boundary(vR)).x; - float T = texture2D(uPressure, boundary(vT)).x; - float B = texture2D(uPressure, boundary(vB)).x; + 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; @@ -315,27 +890,22 @@ const pressureShader = compileShader(gl.FRAGMENT_SHADER, ` `); const gradientSubtractShader = compileShader(gl.FRAGMENT_SHADER, ` - precision highp float; + precision mediump float; precision mediump sampler2D; - varying vec2 vUv; - varying vec2 vL; - varying vec2 vR; - varying vec2 vT; - varying vec2 vB; + 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; - vec2 boundary (in vec2 uv) { - uv = min(max(uv, 0.0), 1.0); - return uv; - } - void main () { - float L = texture2D(uPressure, boundary(vL)).x; - float R = texture2D(uPressure, boundary(vR)).x; - float T = texture2D(uPressure, boundary(vT)).x; - float B = texture2D(uPressure, boundary(vB)).x; + 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); @@ -350,19 +920,130 @@ const blit = (() => { gl.vertexAttribPointer(0, 2, gl.FLOAT, false, 0, 0); gl.enableVertexAttribArray(0); - return (destination) => { - gl.bindFramebuffer(gl.FRAMEBUFFER, destination); + return (target, clear = false) => { + 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); + } + if (clear) + { + gl.clearColor(0.0, 0.0, 0.0, 1.0); + gl.clear(gl.COLOR_BUFFER_BIT); + } + // CHECK_FRAMEBUFFER_STATUS(); gl.drawElements(gl.TRIANGLES, 6, gl.UNSIGNED_SHORT, 0); } })(); -function clear (target) { - gl.bindFramebuffer(gl.FRAMEBUFFER, target); - gl.clear(gl.COLOR_BUFFER_BIT); +function CHECK_FRAMEBUFFER_STATUS () { + let status = gl.checkFramebufferStatus(gl.FRAMEBUFFER); + if (status != gl.FRAMEBUFFER_COMPLETE) + console.trace("Framebuffer error: " + status); } -function createFBO (texId, w, h, internalFormat, format, type, param) { - gl.activeTexture(gl.TEXTURE0 + texId); +let dye; +let velocity; +let divergence; +let curl; +let pressure; +let bloom; +let bloomFramebuffers = []; +let sunrays; +let sunraysTemp; + +let ditheringTexture = createTextureAsync('LDR_LLL1_0.png'); + +const blurProgram = new Program(blurVertexShader, blurShader); +const copyProgram = new Program(baseVertexShader, copyShader); +const clearProgram = new Program(baseVertexShader, clearShader); +const colorProgram = new Program(baseVertexShader, colorShader); +const checkerboardProgram = new Program(baseVertexShader, checkerboardShader); +const bloomPrefilterProgram = new Program(baseVertexShader, bloomPrefilterShader); +const bloomBlurProgram = new Program(baseVertexShader, bloomBlurShader); +const bloomFinalProgram = new Program(baseVertexShader, bloomFinalShader); +const sunraysMaskProgram = new Program(baseVertexShader, sunraysMaskShader); +const sunraysProgram = new Program(baseVertexShader, sunraysShader); +const splatProgram = new Program(baseVertexShader, splatShader); +const advectionProgram = new Program(baseVertexShader, advectionShader); +const divergenceProgram = new Program(baseVertexShader, divergenceShader); +const curlProgram = new Program(baseVertexShader, curlShader); +const vorticityProgram = new Program(baseVertexShader, vorticityShader); +const pressureProgram = new Program(baseVertexShader, pressureShader); +const gradienSubtractProgram = new Program(baseVertexShader, gradientSubtractShader); + +const displayMaterial = new Material(baseVertexShader, displayShaderSource); + +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; + + gl.disable(gl.BLEND); + + 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(); + initSunraysFramebuffers(); +} + +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 initSunraysFramebuffers () { + let res = getResolution(config.SUNRAYS_RESOLUTION); + + const texType = ext.halfFloatTexType; + const r = ext.formatR; + const filtering = ext.supportLinearFiltering ? gl.LINEAR : gl.NEAREST; + + sunrays = createFBO(res.width, res.height, r.internalFormat, r.format, texType, filtering); + sunraysTemp = createFBO(res.width, res.height, r.internalFormat, r.format, texType, filtering); +} + +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); @@ -377,21 +1058,46 @@ function createFBO (texId, w, h, internalFormat, format, type, param) { gl.viewport(0, 0, w, h); gl.clear(gl.COLOR_BUFFER_BIT); - return [texture, fbo, texId]; + let texelSizeX = 1.0 / w; + let texelSizeY = 1.0 / h; + + return { + texture, + fbo, + width: w, + height: h, + texelSizeX, + texelSizeY, + attach (id) { + gl.activeTexture(gl.TEXTURE0 + id); + gl.bindTexture(gl.TEXTURE_2D, texture); + return id; + } + }; } -function createDoubleFBO (texId, w, h, internalFormat, format, type, param) { - let fbo1 = createFBO(texId , w, h, internalFormat, format, type, param); - let fbo2 = createFBO(texId + 1, w, h, internalFormat, format, type, param); +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); return { - get first () { + width: w, + height: h, + texelSizeX: fbo1.texelSizeX, + texelSizeY: fbo1.texelSizeY, + get read () { return fbo1; }, - get second () { + set read (value) { + fbo1 = value; + }, + get write () { return fbo2; }, - swap: () => { + set write (value) { + fbo2 = value; + }, + swap () { let temp = fbo1; fbo1 = fbo2; fbo2 = temp; @@ -399,221 +1105,542 @@ function createDoubleFBO (texId, w, h, internalFormat, format, type, param) { } } -let textureWidth; -let textureHeight; -let density; -let velocity; -let divergence; -let curl; -let pressure; +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); + return newFBO; +} -function initFramebuffers () { - textureWidth = gl.drawingBufferWidth >> config.TEXTURE_DOWNSAMPLE; - textureHeight = gl.drawingBufferHeight >> config.TEXTURE_DOWNSAMPLE; +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; +} - const internalFormat = isWebGL2 ? gl.RGBA16F : gl.RGBA; - const internalFormatRG = isWebGL2 ? gl.RG16F : gl.RGBA; - const formatRG = isWebGL2 ? gl.RG : gl.RGBA; - const texType = isWebGL2 ? gl.HALF_FLOAT : halfFloat.HALF_FLOAT_OES; +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; +} - density = createDoubleFBO(0, textureWidth, textureHeight, internalFormat , gl.RGBA , texType, support_linear_float ? gl.LINEAR : gl.NEAREST); - velocity = createDoubleFBO(2, textureWidth, textureHeight, internalFormatRG, formatRG, texType, support_linear_float ? gl.LINEAR : gl.NEAREST); - divergence = createFBO (4, textureWidth, textureHeight, internalFormatRG, formatRG, texType, gl.NEAREST); - curl = createFBO (5, textureWidth, textureHeight, internalFormatRG, formatRG, texType, gl.NEAREST); - pressure = createDoubleFBO(6, textureWidth, textureHeight, internalFormatRG, formatRG, texType, gl.NEAREST); +function updateKeywords () { + let displayKeywords = []; + if (config.SHADING) displayKeywords.push("SHADING"); + if (config.BLOOM) displayKeywords.push("BLOOM"); + if (config.SUNRAYS) displayKeywords.push("SUNRAYS"); + displayMaterial.setKeywords(displayKeywords); } +updateKeywords(); initFramebuffers(); +multipleSplats(parseInt(Math.random() * 20) + 5); -const clearProgram = new GLProgram(baseVertexShader, clearShader); -const displayProgram = new GLProgram(baseVertexShader, displayShader); -const splatProgram = new GLProgram(baseVertexShader, splatShader); -const advectionProgram = new GLProgram(baseVertexShader, support_linear_float ? advectionShader : advectionManualFilteringShader); -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); +let lastUpdateTime = Date.now(); +let colorUpdateTimer = 0.0; +update(); -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]; +function update () { + const dt = calcDeltaTime(); + if (resizeCanvas()) + initFramebuffers(); + updateColors(dt); + applyInputs(); + if (!config.PAUSED) + step(dt); + render(null); + requestAnimationFrame(update); } -let pointers = []; -pointers.push(new pointerPrototype()); - -for (let i = 0; i < 10; i++) { - const color = [Math.random() * 10, Math.random() * 10, Math.random() * 10]; - const x = canvas.width * Math.random(); - const y = canvas.height * Math.random(); - const dx = 1000 * (Math.random() - 0.5); - const dy = 1000 * (Math.random() - 0.5); - splat(x, y, dx, dy, color); +function calcDeltaTime () { + let now = Date.now(); + let dt = (now - lastUpdateTime) / 1000; + dt = Math.min(dt, 0.016666); + lastUpdateTime = now; + return dt; } -let lastTime = Date.now(); -Update(); +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 Update () { - resizeCanvas(); +function updateColors (dt) { + if (!config.COLORFUL) return; - const dt = Math.min((Date.now() - lastTime) / 1000, 0.016); - lastTime = Date.now(); + colorUpdateTimer += dt * config.COLOR_UPDATE_SPEED; + if (colorUpdateTimer >= 1) { + colorUpdateTimer = wrap(colorUpdateTimer, 0, 1); + pointers.forEach(p => { + p.color = generateColor(); + }); + } +} - gl.viewport(0, 0, textureWidth, textureHeight); +function applyInputs () { + if (splatStack.length > 0) + multipleSplats(splatStack.pop()); - advectionProgram.bind(); - gl.uniform2f(advectionProgram.uniforms.texelSize, 1.0 / textureWidth, 1.0 / textureHeight); - gl.uniform1i(advectionProgram.uniforms.uVelocity, velocity.first[2]); - gl.uniform1i(advectionProgram.uniforms.uSource, velocity.first[2]); - gl.uniform1f(advectionProgram.uniforms.dt, dt); - gl.uniform1f(advectionProgram.uniforms.dissipation, config.VELOCITY_DISSIPATION); - blit(velocity.second[1]); - velocity.swap(); - - gl.uniform1i(advectionProgram.uniforms.uVelocity, velocity.first[2]); - gl.uniform1i(advectionProgram.uniforms.uSource, density.first[2]); - gl.uniform1f(advectionProgram.uniforms.dissipation, config.DENSITY_DISSIPATION); - blit(density.second[1]); - density.swap(); - - for (let i = 0; i < pointers.length; i++) { - const pointer = pointers[i]; - if (pointer.moved) { - splat(pointer.x, pointer.y, pointer.dx, pointer.dy, pointer.color); - pointer.moved = false; + pointers.forEach(p => { + if (p.moved) { + p.moved = false; + splatPointer(p); } - } + }); +} + +function step (dt) { + gl.disable(gl.BLEND); curlProgram.bind(); - gl.uniform2f(curlProgram.uniforms.texelSize, 1.0 / textureWidth, 1.0 / textureHeight); - gl.uniform1i(curlProgram.uniforms.uVelocity, velocity.first[2]); - blit(curl[1]); + gl.uniform2f(curlProgram.uniforms.texelSize, velocity.texelSizeX, velocity.texelSizeY); + gl.uniform1i(curlProgram.uniforms.uVelocity, velocity.read.attach(0)); + blit(curl); vorticityProgram.bind(); - gl.uniform2f(vorticityProgram.uniforms.texelSize, 1.0 / textureWidth, 1.0 / textureHeight); - gl.uniform1i(vorticityProgram.uniforms.uVelocity, velocity.first[2]); - gl.uniform1i(vorticityProgram.uniforms.uCurl, curl[2]); + 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.second[1]); + blit(velocity.write); velocity.swap(); divergenceProgram.bind(); - gl.uniform2f(divergenceProgram.uniforms.texelSize, 1.0 / textureWidth, 1.0 / textureHeight); - gl.uniform1i(divergenceProgram.uniforms.uVelocity, velocity.first[2]); - blit(divergence[1]); + gl.uniform2f(divergenceProgram.uniforms.texelSize, velocity.texelSizeX, velocity.texelSizeY); + gl.uniform1i(divergenceProgram.uniforms.uVelocity, velocity.read.attach(0)); + blit(divergence); clearProgram.bind(); - gl.uniform1i(clearProgram.uniforms.uTexture, pressure.first[2]); - gl.uniform1f(clearProgram.uniforms.value, config.PRESSURE_CONCENTRATION); - blit(pressure.second[1]); + gl.uniform1i(clearProgram.uniforms.uTexture, pressure.read.attach(0)); + gl.uniform1f(clearProgram.uniforms.value, config.PRESSURE); + blit(pressure.write); pressure.swap(); pressureProgram.bind(); - gl.uniform2f(pressureProgram.uniforms.texelSize, 1.0 / textureWidth, 1.0 / textureHeight); - gl.uniform1i(pressureProgram.uniforms.uDivergence, divergence[2]); + 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.first[2]); - blit(pressure.second[1]); + gl.uniform1i(pressureProgram.uniforms.uPressure, pressure.read.attach(1)); + blit(pressure.write); pressure.swap(); } gradienSubtractProgram.bind(); - gl.uniform2f(gradienSubtractProgram.uniforms.texelSize, 1.0 / textureWidth, 1.0 / textureHeight); - gl.uniform1i(gradienSubtractProgram.uniforms.uPressure, pressure.first[2]); - gl.uniform1i(gradienSubtractProgram.uniforms.uVelocity, velocity.first[2]); - blit(velocity.second[1]); + 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); velocity.swap(); - gl.viewport(0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight); - displayProgram.bind(); - gl.uniform1i(displayProgram.uniforms.uTexture, density.first[2]); - blit(null); + 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); + velocity.swap(); + + 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); + dye.swap(); +} + +function render (target) { + if (config.BLOOM) + applyBloom(dye.read, bloom); + if (config.SUNRAYS) { + applySunrays(dye.read, dye.write, sunrays); + blur(sunrays, sunraysTemp, 1); + } + + if (target == null || !config.TRANSPARENT) { + gl.blendFunc(gl.ONE, gl.ONE_MINUS_SRC_ALPHA); + gl.enable(gl.BLEND); + } + else { + gl.disable(gl.BLEND); + } + + if (!config.TRANSPARENT) + drawColor(target, normalizeColor(config.BACK_COLOR)); + if (target == null && config.TRANSPARENT) + drawCheckerboard(target); + drawDisplay(target); +} + +function drawColor (target, color) { + colorProgram.bind(); + gl.uniform4f(colorProgram.uniforms.color, color.r, color.g, color.b, 1); + blit(target); +} + +function drawCheckerboard (target) { + checkerboardProgram.bind(); + gl.uniform1f(checkerboardProgram.uniforms.aspectRatio, canvas.width / canvas.height); + blit(target); +} + +function drawDisplay (target) { + let width = target == null ? gl.drawingBufferWidth : target.width; + let height = target == null ? gl.drawingBufferHeight : target.height; + + displayMaterial.bind(); + if (config.SHADING) + gl.uniform2f(displayMaterial.uniforms.texelSize, 1.0 / width, 1.0 / height); + gl.uniform1i(displayMaterial.uniforms.uTexture, dye.read.attach(0)); + if (config.BLOOM) { + gl.uniform1i(displayMaterial.uniforms.uBloom, bloom.attach(1)); + gl.uniform1i(displayMaterial.uniforms.uDithering, ditheringTexture.attach(2)); + let scale = getTextureScale(ditheringTexture, width, height); + gl.uniform2f(displayMaterial.uniforms.ditherScale, scale.x, scale.y); + } + if (config.SUNRAYS) + gl.uniform1i(displayMaterial.uniforms.uSunrays, sunrays.attach(3)); + blit(target); +} + +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)); + blit(last); + + bloomBlurProgram.bind(); + for (let i = 0; i < bloomFramebuffers.length; i++) { + let dest = bloomFramebuffers[i]; + gl.uniform2f(bloomBlurProgram.uniforms.texelSize, last.texelSizeX, last.texelSizeY); + gl.uniform1i(bloomBlurProgram.uniforms.uTexture, last.attach(0)); + blit(dest); + 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, last.texelSizeX, last.texelSizeY); + gl.uniform1i(bloomBlurProgram.uniforms.uTexture, last.attach(0)); + gl.viewport(0, 0, baseTex.width, baseTex.height); + blit(baseTex); + last = baseTex; + } + + gl.disable(gl.BLEND); + bloomFinalProgram.bind(); + gl.uniform2f(bloomFinalProgram.uniforms.texelSize, last.texelSizeX, last.texelSizeY); + gl.uniform1i(bloomFinalProgram.uniforms.uTexture, last.attach(0)); + gl.uniform1f(bloomFinalProgram.uniforms.intensity, config.BLOOM_INTENSITY); + blit(destination); +} + +function applySunrays (source, mask, destination) { + gl.disable(gl.BLEND); + sunraysMaskProgram.bind(); + gl.uniform1i(sunraysMaskProgram.uniforms.uTexture, source.attach(0)); + blit(mask); + + sunraysProgram.bind(); + gl.uniform1f(sunraysProgram.uniforms.weight, config.SUNRAYS_WEIGHT); + gl.uniform1i(sunraysProgram.uniforms.uTexture, mask.attach(0)); + blit(destination); +} + +function blur (target, temp, iterations) { + blurProgram.bind(); + for (let i = 0; i < iterations; i++) { + gl.uniform2f(blurProgram.uniforms.texelSize, target.texelSizeX, 0.0); + gl.uniform1i(blurProgram.uniforms.uTexture, target.attach(0)); + blit(temp); + + gl.uniform2f(blurProgram.uniforms.texelSize, 0.0, target.texelSizeY); + gl.uniform1i(blurProgram.uniforms.uTexture, temp.attach(0)); + blit(target); + } +} - requestAnimationFrame(Update); +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) { splatProgram.bind(); - gl.uniform1i(splatProgram.uniforms.uTarget, velocity.first[2]); + gl.uniform1i(splatProgram.uniforms.uTarget, velocity.read.attach(0)); 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); - blit(velocity.second[1]); + 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); velocity.swap(); - gl.uniform1i(splatProgram.uniforms.uTarget, density.first[2]); - gl.uniform3f(splatProgram.uniforms.color, color[0] * 0.3, color[1] * 0.3, color[2] * 0.3); - blit(density.second[1]); - density.swap(); + gl.uniform1i(splatProgram.uniforms.uTarget, dye.read.attach(0)); + gl.uniform3f(splatProgram.uniforms.color, color.r, color.g, color.b); + blit(dye.write); + dye.swap(); } -function resizeCanvas () { - if (canvas.width != canvas.clientWidth || canvas.height != canvas.clientHeight) { - canvas.width = canvas.clientWidth; - canvas.height = canvas.clientHeight; - initFramebuffers(); - } +function correctRadius (radius) { + let aspectRatio = canvas.width / canvas.height; + if (aspectRatio > 1) + radius *= aspectRatio; + return radius; } -canvas.addEventListener('mousemove', (e) => { - pointers[0].moved = pointers[0].down; - pointers[0].dx = (e.offsetX - pointers[0].x) * 10.0; - pointers[0].dy = (e.offsetY - pointers[0].y) * 10.0; - pointers[0].x = e.offsetX; - pointers[0].y = e.offsetY; +canvas.addEventListener('mousedown', e => { + let posX = scaleByPixelRatio(e.offsetX); + let posY = scaleByPixelRatio(e.offsetY); + let pointer = pointers.find(p => p.id == -1); + if (pointer == null) + pointer = new pointerPrototype(); + updatePointerDownData(pointer, -1, posX, posY); +}); + +canvas.addEventListener('mousemove', e => { + let pointer = pointers[0]; + if (!pointer.down) return; + let posX = scaleByPixelRatio(e.offsetX); + let posY = scaleByPixelRatio(e.offsetY); + updatePointerMoveData(pointer, posX, posY); }); -canvas.addEventListener('touchmove', (e) => { +window.addEventListener('mouseup', () => { + updatePointerUpData(pointers[0]); +}); + +canvas.addEventListener('touchstart', e => { e.preventDefault(); const touches = e.targetTouches; + while (touches.length >= pointers.length) + pointers.push(new pointerPrototype()); for (let i = 0; i < touches.length; i++) { - let pointer = pointers[i]; - pointer.moved = pointer.down; - pointer.dx = (touches[i].pageX - pointer.x) * 10.0; - pointer.dy = (touches[i].pageY - pointer.y) * 10.0; - pointer.x = touches[i].pageX; - pointer.y = touches[i].pageY; + let posX = scaleByPixelRatio(touches[i].pageX); + let posY = scaleByPixelRatio(touches[i].pageY); + updatePointerDownData(pointers[i + 1], touches[i].identifier, posX, posY); } -}, false); - -canvas.addEventListener('mousedown', () => { - pointers[0].down = true; - pointers[0].color = [Math.random() + 0.2, Math.random() + 0.2, Math.random() + 0.2]; }); -canvas.addEventListener('touchstart', (e) => { +canvas.addEventListener('touchmove', e => { e.preventDefault(); const touches = e.targetTouches; for (let i = 0; i < touches.length; i++) { - if (i >= pointers.length) - pointers.push(new pointerPrototype()); + let pointer = pointers[i + 1]; + if (!pointer.down) continue; + let posX = scaleByPixelRatio(touches[i].pageX); + let posY = scaleByPixelRatio(touches[i].pageY); + updatePointerMoveData(pointer, posX, posY); + } +}, false); - 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 = [Math.random() + 0.2, Math.random() + 0.2, Math.random() + 0.2]; +window.addEventListener('touchend', e => { + const touches = e.changedTouches; + for (let i = 0; i < touches.length; i++) + { + let pointer = pointers.find(p => p.id == touches[i].identifier); + if (pointer == null) continue; + updatePointerUpData(pointer); } }); -window.addEventListener('mouseup', () => { - pointers[0].down = false; +window.addEventListener('keydown', e => { + if (e.code === 'KeyP') + config.PAUSED = !config.PAUSED; + if (e.key === ' ') + splatStack.push(parseInt(Math.random() * 20) + 5); }); -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) - pointers[j].down = false; -}); \ No newline at end of file +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.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); + pointer.moved = Math.abs(pointer.deltaX) > 0 || Math.abs(pointer.deltaY) > 0; +} + +function updatePointerUpData (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); +} + +function hashCode (s) { + if (s.length == 0) return 0; + let hash = 0; + for (let i = 0; i < s.length; i++) { + hash = (hash << 5) - hash + s.charCodeAt(i); + hash |= 0; // Convert to 32bit integer + } + return hash; +}; \ No newline at end of file