|
| 1 | +--- |
| 2 | +interface Props { |
| 3 | + class?: string; |
| 4 | +} |
| 5 | +
|
| 6 | +const { class: className } = Astro.props; |
| 7 | +--- |
| 8 | + |
| 9 | +<canvas data-latent-field class:list={["pointer-events-none block", className]} |
| 10 | +></canvas> |
| 11 | + |
| 12 | +<script> |
| 13 | + function init(canvas: HTMLCanvasElement) { |
| 14 | + const gl = canvas.getContext("webgl", { |
| 15 | + alpha: true, |
| 16 | + antialias: false, |
| 17 | + premultipliedAlpha: false, |
| 18 | + }); |
| 19 | + |
| 20 | + if (!gl) { |
| 21 | + canvas.style.display = "none"; |
| 22 | + return; |
| 23 | + } |
| 24 | + |
| 25 | + const reduceMotion = window.matchMedia( |
| 26 | + "(prefers-reduced-motion: reduce)", |
| 27 | + ).matches; |
| 28 | + |
| 29 | + const vsSrc = ` |
| 30 | + attribute vec2 aPos; |
| 31 | + void main() { |
| 32 | + gl_Position = vec4(aPos, 0.0, 1.0); |
| 33 | + } |
| 34 | + `; |
| 35 | + |
| 36 | + const fsSrc = ` |
| 37 | + precision highp float; |
| 38 | + uniform vec2 uResolution; |
| 39 | + uniform float uTileSize; |
| 40 | + uniform float uTime; |
| 41 | + uniform float uPitch; |
| 42 | + |
| 43 | + vec3 mod289_3(vec3 x) { return x - floor(x * (1.0 / 289.0)) * 289.0; } |
| 44 | + vec4 mod289_4(vec4 x) { return x - floor(x * (1.0 / 289.0)) * 289.0; } |
| 45 | + vec4 permute(vec4 x) { return mod289_4(((x * 34.0) + 1.0) * x); } |
| 46 | + vec4 taylorInvSqrt(vec4 r) { return 1.79284291400159 - 0.85373472095314 * r; } |
| 47 | + |
| 48 | + float snoise(vec3 v) { |
| 49 | + const vec2 C = vec2(1.0 / 6.0, 1.0 / 3.0); |
| 50 | + const vec4 D = vec4(0.0, 0.5, 1.0, 2.0); |
| 51 | + vec3 i = floor(v + dot(v, C.yyy)); |
| 52 | + vec3 x0 = v - i + dot(i, C.xxx); |
| 53 | + vec3 g = step(x0.yzx, x0.xyz); |
| 54 | + vec3 l = 1.0 - g; |
| 55 | + vec3 i1 = min(g.xyz, l.zxy); |
| 56 | + vec3 i2 = max(g.xyz, l.zxy); |
| 57 | + vec3 x1 = x0 - i1 + C.xxx; |
| 58 | + vec3 x2 = x0 - i2 + C.yyy; |
| 59 | + vec3 x3 = x0 - D.yyy; |
| 60 | + i = mod289_3(i); |
| 61 | + vec4 p = permute(permute(permute( |
| 62 | + i.z + vec4(0.0, i1.z, i2.z, 1.0)) |
| 63 | + + i.y + vec4(0.0, i1.y, i2.y, 1.0)) |
| 64 | + + i.x + vec4(0.0, i1.x, i2.x, 1.0)); |
| 65 | + float n_ = 0.142857142857; |
| 66 | + vec3 ns = n_ * D.wyz - D.xzx; |
| 67 | + vec4 j = p - 49.0 * floor(p * ns.z * ns.z); |
| 68 | + vec4 x_ = floor(j * ns.z); |
| 69 | + vec4 y_ = floor(j - 7.0 * x_); |
| 70 | + vec4 x = x_ * ns.x + ns.yyyy; |
| 71 | + vec4 y = y_ * ns.x + ns.yyyy; |
| 72 | + vec4 h = 1.0 - abs(x) - abs(y); |
| 73 | + vec4 b0 = vec4(x.xy, y.xy); |
| 74 | + vec4 b1 = vec4(x.zw, y.zw); |
| 75 | + vec4 s0 = floor(b0) * 2.0 + 1.0; |
| 76 | + vec4 s1 = floor(b1) * 2.0 + 1.0; |
| 77 | + vec4 sh = -step(h, vec4(0.0)); |
| 78 | + vec4 a0 = b0.xzyw + s0.xzyw * sh.xxyy; |
| 79 | + vec4 a1 = b1.xzyw + s1.xzyw * sh.zzww; |
| 80 | + vec3 p0 = vec3(a0.xy, h.x); |
| 81 | + vec3 p1 = vec3(a0.zw, h.y); |
| 82 | + vec3 p2 = vec3(a1.xy, h.z); |
| 83 | + vec3 p3 = vec3(a1.zw, h.w); |
| 84 | + vec4 norm = taylorInvSqrt(vec4(dot(p0, p0), dot(p1, p1), dot(p2, p2), dot(p3, p3))); |
| 85 | + p0 *= norm.x; p1 *= norm.y; p2 *= norm.z; p3 *= norm.w; |
| 86 | + vec4 m = max(0.6 - vec4(dot(x0, x0), dot(x1, x1), dot(x2, x2), dot(x3, x3)), 0.0); |
| 87 | + m = m * m; |
| 88 | + return 42.0 * dot(m * m, vec4(dot(p0, x0), dot(p1, x1), dot(p2, x2), dot(p3, x3))); |
| 89 | + } |
| 90 | + |
| 91 | + float fbm(vec3 p) { |
| 92 | + return snoise(p) * 0.65 + snoise(p * 2.1 + 5.0) * 0.35; |
| 93 | + } |
| 94 | + |
| 95 | + void main() { |
| 96 | + vec2 frag = gl_FragCoord.xy; |
| 97 | + |
| 98 | + vec2 tileSize = vec2(uTileSize); |
| 99 | + vec2 tileId = floor(frag / tileSize); |
| 100 | + vec2 inTile = frag - tileId * tileSize; |
| 101 | + |
| 102 | + float gap = uTileSize * 0.05; |
| 103 | + vec2 innerSize = tileSize - 2.0 * gap; |
| 104 | + vec2 innerPos = inTile - gap; |
| 105 | + if (innerPos.x < 0.0 || innerPos.y < 0.0 || |
| 106 | + innerPos.x > innerSize.x || innerPos.y > innerSize.y) { |
| 107 | + gl_FragColor = vec4(0.0); |
| 108 | + return; |
| 109 | + } |
| 110 | + |
| 111 | + vec2 cell = innerPos / uPitch; |
| 112 | + vec2 cellId = floor(cell); |
| 113 | + vec2 cellCenter = (cellId + 0.5) * uPitch; |
| 114 | + vec2 d = innerPos - cellCenter; |
| 115 | + float dist = length(d); |
| 116 | + |
| 117 | + if (cellCenter.x < 0.0 || cellCenter.y < 0.0 || |
| 118 | + cellCenter.x > innerSize.x || cellCenter.y > innerSize.y) { |
| 119 | + gl_FragColor = vec4(0.0); |
| 120 | + return; |
| 121 | + } |
| 122 | + |
| 123 | + vec2 dotUv = cellCenter / innerSize; |
| 124 | + vec2 tileSeed = tileId * 23.7 + vec2(3.1, 11.5); |
| 125 | + float field = fbm(vec3(dotUv * 2.4 + tileSeed, uTime * 0.08)); |
| 126 | + |
| 127 | + float threshold = 0.05; |
| 128 | + if (field > threshold) { |
| 129 | + gl_FragColor = vec4(0.0); |
| 130 | + return; |
| 131 | + } |
| 132 | + |
| 133 | + float dotR = uPitch * 0.18; |
| 134 | + float alpha = smoothstep(dotR + 0.6, dotR - 0.6, dist); |
| 135 | + if (alpha < 0.01) { |
| 136 | + gl_FragColor = vec4(0.0); |
| 137 | + return; |
| 138 | + } |
| 139 | + |
| 140 | + float edgeStart = threshold - 0.22; |
| 141 | + float edgeFactor = smoothstep(edgeStart, threshold, field); |
| 142 | + |
| 143 | + vec3 cDot = vec3(0.85, 0.60, 0.92); |
| 144 | + vec3 cEdge = vec3(0.96, 0.34, 0.42); |
| 145 | + vec3 col = mix(cDot, cEdge, edgeFactor); |
| 146 | + |
| 147 | + gl_FragColor = vec4(col, alpha); |
| 148 | + } |
| 149 | + `; |
| 150 | + |
| 151 | + function compile(type: number, src: string) { |
| 152 | + const s = gl!.createShader(type)!; |
| 153 | + gl!.shaderSource(s, src); |
| 154 | + gl!.compileShader(s); |
| 155 | + if (!gl!.getShaderParameter(s, gl!.COMPILE_STATUS)) { |
| 156 | + console.error(gl!.getShaderInfoLog(s)); |
| 157 | + } |
| 158 | + return s; |
| 159 | + } |
| 160 | + |
| 161 | + const program = gl.createProgram()!; |
| 162 | + gl.attachShader(program, compile(gl.VERTEX_SHADER, vsSrc)); |
| 163 | + gl.attachShader(program, compile(gl.FRAGMENT_SHADER, fsSrc)); |
| 164 | + gl.linkProgram(program); |
| 165 | + gl.useProgram(program); |
| 166 | + |
| 167 | + const quad = new Float32Array([ |
| 168 | + -1, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, 1, |
| 169 | + ]); |
| 170 | + const buf = gl.createBuffer(); |
| 171 | + gl.bindBuffer(gl.ARRAY_BUFFER, buf); |
| 172 | + gl.bufferData(gl.ARRAY_BUFFER, quad, gl.STATIC_DRAW); |
| 173 | + |
| 174 | + const aPos = gl.getAttribLocation(program, "aPos"); |
| 175 | + gl.enableVertexAttribArray(aPos); |
| 176 | + gl.vertexAttribPointer(aPos, 2, gl.FLOAT, false, 0, 0); |
| 177 | + |
| 178 | + const uResolution = gl.getUniformLocation(program, "uResolution"); |
| 179 | + const uTileSize = gl.getUniformLocation(program, "uTileSize"); |
| 180 | + const uTime = gl.getUniformLocation(program, "uTime"); |
| 181 | + const uPitch = gl.getUniformLocation(program, "uPitch"); |
| 182 | + |
| 183 | + gl.enable(gl.BLEND); |
| 184 | + gl.blendFuncSeparate( |
| 185 | + gl.SRC_ALPHA, |
| 186 | + gl.ONE_MINUS_SRC_ALPHA, |
| 187 | + gl.ONE, |
| 188 | + gl.ONE_MINUS_SRC_ALPHA, |
| 189 | + ); |
| 190 | + gl.clearColor(0, 0, 0, 0); |
| 191 | + |
| 192 | + function resize() { |
| 193 | + const dpr = Math.min(window.devicePixelRatio || 1, 2); |
| 194 | + const rect = canvas.getBoundingClientRect(); |
| 195 | + canvas.width = Math.max(1, Math.floor(rect.width * dpr)); |
| 196 | + canvas.height = Math.max(1, Math.floor(rect.height * dpr)); |
| 197 | + gl!.viewport(0, 0, canvas.width, canvas.height); |
| 198 | + |
| 199 | + const isNarrow = window.matchMedia("(max-width: 768px)").matches; |
| 200 | + const tilesAcrossShortSide = isNarrow ? 2 : 3; |
| 201 | + const tileSize = |
| 202 | + Math.min(canvas.width, canvas.height) / tilesAcrossShortSide; |
| 203 | + const pitch = Math.max(4, Math.round(tileSize / 50)); |
| 204 | + |
| 205 | + gl!.uniform2f(uResolution, canvas.width, canvas.height); |
| 206 | + gl!.uniform1f(uTileSize, tileSize); |
| 207 | + gl!.uniform1f(uPitch, pitch); |
| 208 | + } |
| 209 | + |
| 210 | + resize(); |
| 211 | + window.addEventListener("resize", resize); |
| 212 | + |
| 213 | + let running = true; |
| 214 | + document.addEventListener("visibilitychange", () => { |
| 215 | + running = !document.hidden; |
| 216 | + if (running) requestAnimationFrame(frame); |
| 217 | + }); |
| 218 | + |
| 219 | + const start = performance.now(); |
| 220 | + |
| 221 | + function frame() { |
| 222 | + if (!running) return; |
| 223 | + const t = (performance.now() - start) / 1000; |
| 224 | + gl!.clear(gl!.COLOR_BUFFER_BIT); |
| 225 | + gl!.uniform1f(uTime, reduceMotion ? 0 : t); |
| 226 | + gl!.drawArrays(gl!.TRIANGLES, 0, 6); |
| 227 | + if (!reduceMotion) requestAnimationFrame(frame); |
| 228 | + } |
| 229 | + |
| 230 | + requestAnimationFrame(frame); |
| 231 | + } |
| 232 | + |
| 233 | + document |
| 234 | + .querySelectorAll<HTMLCanvasElement>("canvas[data-latent-field]") |
| 235 | + .forEach(init); |
| 236 | +</script> |
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