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\n \n \n \n \n Halcyon\n \n \n

\n \n Get started\n

\n\n

\n Halcyon Streams is live →\n

Calm infrastructure
for fast teams.

Realtime data, queues, and object storage on one liquid-smooth platform. No ops, no cold starts, no drama.

\n\n

\n \n

\n \n Start free\n \n Read the docs\n

\n\n

Free to start · No credit card · SOC 2 Type II

\n\n \n

\n \n\n\n",[143],"2caa0778-5144-4470-ab18-ebd11b4ce1df","README.md","2cf3a75a-602b-11f1-a59c-1607ee4eb77e",5,["D",1780587397911],"# 💧 water-button\n\nTwo chunky glass buttons filled with shader-simulated water. Raw WebGL, no libraries.\n\n- **Left vessel** starts empty and fills ~8.5% per click (caps at 95%).\n- **Right vessel** always settles back to half full.\n- Both **slosh** when clicked — a side-to-side tilt plus a localized splash.\n\nThe water surface is a 1D height-field (128 columns) integrated on the CPU each\nframe, encoded into a `1×N` texture, and handed to a fragment shader that draws\nthe body, caustics, and a bright waterline. CSS handles the chunky rounded glass.\n\n```mermaid\nflowchart LR\n Click -->|tilt + splash impulse| Sim[Height-field sim
128 cols · fixed step]\n Sim -->|encode offsets| Tex[1xN texture]\n Tex --> Shader[Fragment shader]\n Shader --> Canvas[Canvas]\n```\n\n## Files\n- `main.ts` — Hono server (serves page + assets, `/source` redirect)\n- `index.html` — markup\n- `frontend/style.css` — dark aquarium theme, glass vessels\n- `frontend/water-button.js` — WebGL sim + interaction\n",[151],"414947f2-722a-493d-9ae8-8b19aa49a5c8","frontend","21d01b35-eec3-4be1-b4d4-ad92450858ed",3,["D",1780587321777],"directory",[158],"pulls","branches","forks","envVars",{"_171":61,"_173":61},"connections",{"_171":61,"_172":61},"count","unfilledCount","emptyCount",{"_43":157,"_32":158,"_30":159,"_134":-5,"_41":42,"_40":160,"_136":122,"_38":204,"_13":61,"_34":162,"_35":-5,"_24":25,"_140":-5,"_181":205,"_27":206},{"_43":200,"_32":33,"_30":31,"_134":159,"_41":42,"_40":14,"_136":122,"_38":201,"_13":147,"_34":20,"_35":37,"_24":25,"_140":-5,"_181":202,"_27":203},{"_43":190,"_32":191,"_30":192,"_134":159,"_41":42,"_40":193,"_136":25,"_38":194,"_13":195,"_34":196,"_35":197,"_24":25,"_140":-5,"_181":198,"_27":199},{"_43":150,"_32":151,"_30":152,"_134":-5,"_41":42,"_40":153,"_136":122,"_38":187,"_13":61,"_34":20,"_35":155,"_24":25,"_140":-5,"_181":188,"_27":189},{"_43":142,"_32":143,"_30":144,"_134":-5,"_41":42,"_40":145,"_136":122,"_38":184,"_13":147,"_34":20,"_35":148,"_24":25,"_140":-5,"_181":185,"_27":186},{"_43":131,"_32":132,"_30":133,"_134":-5,"_41":42,"_40":135,"_136":25,"_38":180,"_13":61,"_34":138,"_35":139,"_24":25,"_140":-5,"_181":182,"_27":183},["D",1780587284607],"children",[],[132],["D",1780589818735],[],[143],["D",1780587397911],[],[151],"dd103baa-9bce-4ed1-82d3-9d4b7eea1daf","water-button.js","1934999a-602b-11f1-9710-1607ee4eb77e",13,["D",1780589354749],6,"script","// Flowing liquid waves — domain-warped FBM (Inigo-Quilez style). Fully bounded\n// math: fbm is always [0,1], so this can't blow out to white on any GPU\n// (unlike the precision-dependent zozuar raymarch). Verified offline before ship.\n// Clicking \"stirs\" the flow (a brief speed surge); the key depresses in CSS.\n\nconst VERT = `\nattribute vec2 aPos;\nvoid main(){ gl_Position = vec4(aPos, 0.0, 1.0); }\n`;\n\nconst FRAG = `\nprecision highp float;\nuniform vec2 iResolution;\nuniform float iTime;\n\nfloat hash21(vec2 p){\n p = fract(p * vec2(123.34, 345.45));\n p += dot(p, p + 34.345);\n return fract(p.x * p.y);\n}\nfloat vnoise(vec2 p){\n vec2 i = floor(p), f = fract(p);\n vec2 u = f * f * (3.0 - 2.0 * f);\n float a = hash21(i), b = hash21(i + vec2(1.0, 0.0));\n float c = hash21(i + vec2(0.0, 1.0)), d = hash21(i + vec2(1.0, 1.0));\n return mix(mix(a, b, u.x), mix(c, d, u.x), u.y);\n}\nfloat fbm(vec2 p){\n float s = 0.0, a = 0.5;\n for (int i = 0; i < 4; i++) { s += a * vnoise(p); p *= 2.0; a *= 0.5; }\n return s;\n}\n\nvoid main(){\n vec2 uv = gl_FragCoord.xy / iResolution.xy;\n vec2 p = (gl_FragCoord.xy - 0.5 * iResolution.xy) / iResolution.y * 3.0;\n float t = iTime * 0.15;\n\n // two-stage domain warp -> organic flowing motion\n vec2 q = vec2(fbm(p + vec2(0.0, t)),\n fbm(p + vec2(5.2, 1.3) - t));\n vec2 r = vec2(fbm(p + 1.6 * q + vec2(1.7, 9.2) + t * 0.7),\n fbm(p + 1.6 * q + vec2(8.3, 2.8) - t * 0.6));\n float n = fbm(p + 2.0 * r + vec2(t * 0.5, 0.0));\n\n // ridged noise for sharp wave-crest lines\n float ridge = 1.0 - abs(2.0 * fbm(p * 2.0 + 3.0 * r + vec2(t, 0.0)) - 1.0);\n ridge = pow(ridge, 3.0);\n\n // liquid palette: deep teal -> cyan -> foam\n vec3 deep = vec3(0.02, 0.09, 0.16);\n vec3 mid = vec3(0.05, 0.45, 0.55);\n vec3 hi = vec3(0.60, 0.93, 0.96);\n vec3 col = mix(deep, mid, smoothstep(0.20, 0.70, n));\n col = mix(col, hi, smoothstep(0.55, 0.95, n) * 0.7);\n col += hi * ridge * 0.5 * smoothstep(0.30, 0.90, n);\n\n // finish (bounded)\n vec2 c2 = uv - 0.5;\n col *= 1.0 - 0.25 * dot(c2, c2); // vignette\n col = col / (col + vec3(0.4)); // tonemap into range\n col = pow(col, vec3(0.85)); // gentle lift\n gl_FragColor = vec4(col, 1.0);\n}\n`;\n\nfunction compile(gl, type, src) {\n const s = gl.createShader(type);\n gl.shaderSource(s, src);\n gl.compileShader(s);\n if (!gl.getShaderParameter(s, gl.COMPILE_STATUS)) {\n throw new Error(gl.getShaderInfoLog(s) || \"shader compile failed\");\n }\n return s;\n}\n\nclass WaveButton {\n constructor(canvas) {\n this.canvas = canvas;\n this.broken = false;\n this.gl = canvas.getContext(\"webgl\", { antialias: true, alpha: false });\n if (!this.gl) { console.warn(\"WebGL unavailable\"); this.broken = true; return; }\n\n try {\n this._initGL();\n } catch (err) {\n console.error(\"Shader init failed:\", err);\n this.broken = true;\n }\n\n this.phase = 6.0;\n this.speed = 1.0;\n this.last = performance.now();\n requestAnimationFrame((t) => this._frame(t));\n }\n\n _initGL() {\n const gl = this.gl;\n const prog = gl.createProgram();\n gl.attachShader(prog, compile(gl, gl.VERTEX_SHADER, VERT));\n gl.attachShader(prog, compile(gl, gl.FRAGMENT_SHADER, FRAG));\n gl.linkProgram(prog);\n if (!gl.getProgramParameter(prog, gl.LINK_STATUS)) {\n throw new Error(gl.getProgramInfoLog(prog) || \"link failed\");\n }\n gl.useProgram(prog);\n this.prog = prog;\n\n const buf = gl.createBuffer();\n gl.bindBuffer(gl.ARRAY_BUFFER, buf);\n gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([-1, -1, 1, -1, -1, 1, 1, 1]), gl.STATIC_DRAW);\n const aPos = gl.getAttribLocation(prog, \"aPos\");\n gl.enableVertexAttribArray(aPos);\n gl.vertexAttribPointer(aPos, 2, gl.FLOAT, false, 0, 0);\n\n this.uRes = gl.getUniformLocation(prog, \"iResolution\");\n this.uTime = gl.getUniformLocation(prog, \"iTime\");\n }\n\n _resize() {\n const gl = this.gl, c = this.canvas;\n const dpr = Math.min(window.devicePixelRatio || 1, 2);\n const w = Math.round(c.clientWidth * dpr);\n const h = Math.round(c.clientHeight * dpr);\n if (w < 2 || h < 2) return false;\n if (c.width === w && c.height === h) return true;\n c.width = w; c.height = h;\n gl.viewport(0, 0, w, h);\n return true;\n }\n\n stir() { this.speed = Math.min(this.speed + 4.0, 7.0); }\n\n _frame(t) {\n if (!this._resize()) { requestAnimationFrame((tt) => this._frame(tt)); return; }\n const gl = this.gl;\n\n gl.clearColor(0.02, 0.06, 0.08, 1.0);\n gl.clear(gl.COLOR_BUFFER_BIT);\n\n if (!this.broken) {\n const dt = Math.min((t - this.last) / 1000, 0.05);\n this.last = t;\n this.speed += (1.0 - this.speed) * Math.min(dt * 2.5, 1.0);\n this.phase += dt * this.speed;\n\n gl.useProgram(this.prog);\n gl.uniform2f(this.uRes, this.canvas.width, this.canvas.height);\n gl.uniform1f(this.uTime, this.phase);\n gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4);\n }\n requestAnimationFrame((tt) => this._frame(tt));\n }\n}\n\nconst keyEl = document.getElementById(\"key\");\nconst btn = new WaveButton(document.getElementById(\"c\"));\n\nif (keyEl) {\n keyEl.addEventListener(\"pointerdown\", () => keyEl.classList.add(\"pressed\"));\n [\"pointerup\", \"pointerleave\", \"pointercancel\"].forEach((ev) =>\n keyEl.addEventListener(ev, () => keyEl.classList.remove(\"pressed\"))\n );\n keyEl.addEventListener(\"click\", () => { if (btn) btn.stir(); });\n keyEl.addEventListener(\"keydown\", (e) => {\n if (e.key === \" \" || e.key === \"Enter\") keyEl.classList.add(\"pressed\");\n });\n keyEl.addEventListener(\"keyup\", () => keyEl.classList.remove(\"pressed\"));\n}\n",[],[158,191],"35336a79-9fbd-444d-9eda-7b0f24ca680c",["D",1780589850442],[],[158,33],["D",1780587321777],[175,176],[158],["D",1780587284590],{"_95":94,"_103":99},{"_95":94,"_96":97,"_98":99,"_18":55,"_100":101,"_102":25},{"_13":84,"_32":85,"_43":42,"_86":44,"_87":-5,"_88":-5,"_89":-5,"_90":-5,"_91":-5,"_92":45,"_93":94},"ctx",{"_77":-5,"_124":244,"_245":246,"_247":248,"_249":25,"_250":25,"_251":25,"_252":122,"_253":-5,"_254":-7,"_255":-7,"_256":61,"_257":25,"_258":25,"_259":-5,"_260":25,"_261":25,"_262":25,"_263":-5},"ENV",{"_215":216,"_217":218,"_219":85,"_220":221,"_222":223,"_224":225,"_226":227,"_228":229,"_230":231,"_232":233,"_234":235,"_236":237,"_238":239,"_240":241,"_242":243},"REACT_APP_SENTRY_DSN","https://586020d86f05489db63a554690acf1e9@o1398359.ingest.sentry.io/6724499","RENDER_GIT_COMMIT","e87eb04e707cf64e7e532c8e8ec395f209e17f15","RENDER_GIT_BRANCH","POSTHOG_API_TOKEN","phc_nmoyuAkStEZuUp69rYlg1DZgrIt19Gx0Y4Hwf8tGgJP","POSTHOG_API_HOST","https://wart.val.town","WEB_API_TEMPLATE","https://{val}.web.val.run","APP_URL","https://www.val.town","MODULE_URL","https://esm.town","VANITY_WEB_API_TEMPLATE","https://{label}.val.run/","DENOLS_URL","https://lsp.val.town","NODE_ENV","production","CLOUDFLARE_TURNSTILE_SITE_KEY","0x4AAAAAACtaIZJH7s9rBMZ6","GOOGLE_CLIENT_ID","875989696899-jtsqkhlbdv5jrlsk8631p7ipjg3c6o62.apps.googleusercontent.com","STRIPE_PUBLISHABLE_KEY","pk_live_51N2zvWEpZTTLipIkVEwXrUG9AT0yeOOEYxszarZT1jpsZV58Ly6wlg3SltZpHN26CUalOBmUSY7adQRQiSkCZz2500qSXNkf8Y","API_URL","https://api.val.town",[],"preferencesKeybindings","default","preferencesTheme","light","preferencesFixers","preferencesCopilot","preferencesSelectionAi","preferencesCloseBrackets","preferencesChatPanelState","preferencesDprint","preferencesDenofmt","notificationCount","flagDenols","isBusinessOrgMember","businessOrgHandle","isBusinessOrgAdmin","isHigherTownieTier","navCollapsed","currentOrgId"]

Calm infrastructurefor fast teams.

Calm infrastructure
for fast teams.

Diff · v15