Grid Tunnel Flight

A canvas and a module script, nothing to install. Set canvas.dataset.tps from your stream, or call canvas.token() once per token.

<canvas id="shader-grid-tunnel-flight" data-tps="240" data-color="#e040fb" style="display:block;width:100%;height:240px;border-radius:12px"></canvas>
<script type="module">
  // Set canvas.dataset.tps from your stream, or call canvas.token() per token.
  const canvas = document.getElementById("shader-grid-tunnel-flight");
  const gl = canvas.getContext("webgl2", { alpha: false, antialias: false });
  const fragment = `#version 300 es
precision highp float;
uniform vec3 iResolution;
uniform float iTime;
uniform float uTokens;
uniform float uTps;
uniform vec3 uColor;
out vec4 outColor;
#define TAU 6.28318530718
float hash11(float p) { p = fract(p * 0.1031); p *= p + 33.33; p *= p + p; return fract(p); }
float hash12(vec2 p) { vec3 q = fract(vec3(p.xyx) * 0.1031); q += dot(q, q.yzx + 33.33); return fract((q.x + q.y) * q.z); }
// the accent, lifted so a dark pick still glows
vec3 accent() { return uColor / max(0.25, max(uColor.r, max(uColor.g, uColor.b))); }
// rotate a colour's hue around the grey axis, for a companion tone
vec3 hueRot(vec3 c, float a) {
  const vec3 k = vec3(0.57735027);
  float ca = cos(a);
  return max(c * ca + cross(k, c) * sin(a) + k * dot(k, c) * (1.0 - ca), 0.0);
}
// 0 at rest, toward 1 as the stream speeds up
float energy() { return 1.0 - exp(-max(uTps, 0.0) / 90.0); }
vec3 stage(vec2 uv) { return vec3(0.008, 0.009, 0.013) + accent() * 0.016 * exp(-dot(uv, uv) * 2.2); }
// soft shoulder so hot cores bloom toward white, plus a dither against banding
vec4 finish(vec3 c, vec2 fc) {
  c = 1.0 - exp(-max(c, 0.0) * 1.35);
  c += (hash12(fc) + hash12(fc + 17.13) - 1.0) / 255.0;
  return vec4(c, 1.0);
}

void mainImage(out vec4 fragColor, in vec2 fragCoord) {
  vec2 uv = (fragCoord - 0.5 * iResolution.xy) / iResolution.y;
  float px = 1.0 / iResolution.y;
  float e = energy();
  vec3 A = accent();
  vec3 B = hueRot(A, 0.9);

  // a slight sway so the idle camera still breathes
  float sw = mod(iTime * 0.3, TAU);
  uv += vec2(0.015 * sin(sw), 0.01 * sin(sw * 1.3 + 1.0));
  float roll = 0.015 * sin(sw * 0.7);
  uv = mat2(cos(roll), -sin(roll), sin(roll), cos(roll)) * uv;

  // a box corridor with the tile's own proportions; wall coords and their
  // screen gradients worked out per wall, so lines stay crisp at the corners
  const float W = 1.0, H = 0.5;
  float ax = max(abs(uv.x), 1e-4), ay = max(abs(uv.y), 1e-4);
  float sx = sign(uv.x), sy = sign(uv.y);
  bool wall = W / ax < H / ay;
  float z, u, side;
  vec2 gz, gu;
  if (wall) {
    z = W / ax; u = uv.y * z / H; side = sx;
    gz = vec2(-W * sx / (ax * ax), 0.0);
    gu = (W / H) * vec2(-uv.y * sx / (ax * ax), 1.0 / ax);
  } else {
    z = H / ay; u = uv.x * z / W; side = 2.0 + sy;
    gz = vec2(0.0, -H * sy / (ay * ay));
    gu = (H / W) * vec2(1.0 / ay, -uv.x * sy / (ay * ay));
  }
  z = min(z, 80.0);

  float P = mod(uTokens * 0.02 + iTime * 0.15, 256.0);
  vec2 gc = vec2(u * 4.0, z * 3.0 - P);
  vec2 fw = px * vec2(4.0 * (abs(gu.x) + abs(gu.y)), 3.0 * (abs(gz.x) + abs(gz.y)));
  vec2 gl = abs(fract(gc + 0.5) - 0.5) / max(fw, 1e-5);
  vec2 lines = 1.0 - min(gl, 1.0);
  // fade lines out before they get too fine to resolve, and right at the lens
  float resolve = 1.0 - smoothstep(0.15, 0.45, max(fw.x, fw.y));
  float near = smoothstep(0.85, 1.4, z);
  float fog = exp(-z * 0.16);
  float grid = max(lines.x, lines.y) * resolve * near;

  // token packets: light running along the rails toward you
  vec2 cell = floor(vec2(gc.x, gc.y / 4.0));
  float h = hash12(vec2(mod(cell.y, 64.0), cell.x + side * 31.0));
  float lit = step(h, 0.05 + 0.3 * e);
  float f = fract(gc.y / 4.0);
  float rail = 1.0 - min(abs(fract(gc.x + 0.5) - 0.5) / max(fw.x * 1.6, 1e-5), 1.0);
  float packet = lit * rail * smoothstep(0.0, 0.8, f) * smoothstep(1.0, 0.92, f) * resolve * near;

  vec3 col = vec3(0.006, 0.007, 0.011);
  col += mix(B, A, fog) * grid * fog * (0.5 + 0.45 * e);
  col += mix(mix(A, vec3(1.0), 0.6), B, h * 3.0) * packet * fog * (0.7 + 0.5 * e);
  col += A * packet * fog * 0.2;
  // vanishing point bloom
  float r = length(uv * vec2(0.5, 1.0));
  col += A * exp(-r * 9.0) * (0.12 + 0.3 * e) + mix(A, vec3(1.0), 0.5) * exp(-r * 40.0) * (0.2 + 0.3 * e);
  fragColor = finish(col, fragCoord);
}

void main() {
  mainImage(outColor, gl_FragCoord.xy);
  outColor.a = 1.0;
}
`;
  const vertex = `#version 300 es
void main() {
  vec2 p = vec2((gl_VertexID << 1) & 2, gl_VertexID & 2);
  gl_Position = vec4(p * 2.0 - 1.0, 0.0, 1.0);
}
`;
  const compile = (type, src) => {
    const s = gl.createShader(type);
    gl.shaderSource(s, src);
    gl.compileShader(s);
    if (!gl.getShaderParameter(s, gl.COMPILE_STATUS)) throw new Error(gl.getShaderInfoLog(s));
    return s;
  };
  const program = gl.createProgram();
  gl.attachShader(program, compile(gl.VERTEX_SHADER, vertex));
  gl.attachShader(program, compile(gl.FRAGMENT_SHADER, fragment));
  gl.linkProgram(program);
  gl.useProgram(program);
  const u = (n) => gl.getUniformLocation(program, n);
  const [res, time, tokens, rate, color] = ["iResolution", "iTime", "uTokens", "uTps", "uColor"].map(u);
  const hex = parseInt((canvas.dataset.color || "#7c5cff").slice(1), 16);
  gl.uniform3f(color, ((hex >> 16) & 255) / 255, ((hex >> 8) & 255) / 255, (hex & 255) / 255);

  // canvas.token(): count real tokens and derive the rate from the last second.
  const stamps = [];
  canvas.token = () => {
    stamps.push(performance.now());
    canvas.dataset.tps = "auto";
  };
  const still = matchMedia("(prefers-reduced-motion: reduce)").matches;
  let count = 0, last = performance.now(), visible = true, frame = 0;
  new IntersectionObserver(([e]) => {
    visible = e.isIntersecting;
    if (visible && !frame) frame = requestAnimationFrame(draw);
  }).observe(canvas);

  function draw(now) {
    frame = 0;
    const dt = Math.min((now - last) / 1000, 0.1);
    last = now;
    while (stamps.length && now - stamps[0] > 1000) stamps.shift();
    const wobble = 1 + 0.25 * Math.sin(now / 588) + 0.15 * Math.sin(now / 233 + 1) + 0.08 * Math.sin(now / 91 + 2);
    const tps = canvas.dataset.tps === "auto" ? stamps.length : Number(canvas.dataset.tps) * wobble;
    count += tps * dt;
    const dpr = Math.min(devicePixelRatio || 1, 2);
    const w = Math.round(canvas.clientWidth * dpr), h = Math.round(canvas.clientHeight * dpr);
    if (canvas.width !== w || canvas.height !== h) { canvas.width = w; canvas.height = h; }
    gl.viewport(0, 0, w, h);
    gl.uniform3f(res, w, h, 1);
    gl.uniform1f(time, still ? 2 : now / 1000);
    gl.uniform1f(tokens, still ? Number(canvas.dataset.tps) * 2 : count);
    gl.uniform1f(rate, tps);
    gl.drawArrays(gl.TRIANGLES, 0, 3);
    if (visible && !still) frame = requestAnimationFrame(draw);
  }
  frame = requestAnimationFrame(draw);
</script>

// Inputs the site passes in, as constants for Shadertoy.
// uTps: tokens per second. uTokens: tokens so far. uColor: the accent.
#define uTps 240.0
#define uTokens (iTime * uTps)
#define uColor vec3(0.878, 0.251, 0.984)

#define TAU 6.28318530718
float hash11(float p) { p = fract(p * 0.1031); p *= p + 33.33; p *= p + p; return fract(p); }
float hash12(vec2 p) { vec3 q = fract(vec3(p.xyx) * 0.1031); q += dot(q, q.yzx + 33.33); return fract((q.x + q.y) * q.z); }
// the accent, lifted so a dark pick still glows
vec3 accent() { return uColor / max(0.25, max(uColor.r, max(uColor.g, uColor.b))); }
// rotate a colour's hue around the grey axis, for a companion tone
vec3 hueRot(vec3 c, float a) {
  const vec3 k = vec3(0.57735027);
  float ca = cos(a);
  return max(c * ca + cross(k, c) * sin(a) + k * dot(k, c) * (1.0 - ca), 0.0);
}
// 0 at rest, toward 1 as the stream speeds up
float energy() { return 1.0 - exp(-max(uTps, 0.0) / 90.0); }
vec3 stage(vec2 uv) { return vec3(0.008, 0.009, 0.013) + accent() * 0.016 * exp(-dot(uv, uv) * 2.2); }
// soft shoulder so hot cores bloom toward white, plus a dither against banding
vec4 finish(vec3 c, vec2 fc) {
  c = 1.0 - exp(-max(c, 0.0) * 1.35);
  c += (hash12(fc) + hash12(fc + 17.13) - 1.0) / 255.0;
  return vec4(c, 1.0);
}

void mainImage(out vec4 fragColor, in vec2 fragCoord) {
  vec2 uv = (fragCoord - 0.5 * iResolution.xy) / iResolution.y;
  float px = 1.0 / iResolution.y;
  float e = energy();
  vec3 A = accent();
  vec3 B = hueRot(A, 0.9);

  // a slight sway so the idle camera still breathes
  float sw = mod(iTime * 0.3, TAU);
  uv += vec2(0.015 * sin(sw), 0.01 * sin(sw * 1.3 + 1.0));
  float roll = 0.015 * sin(sw * 0.7);
  uv = mat2(cos(roll), -sin(roll), sin(roll), cos(roll)) * uv;

  // a box corridor with the tile's own proportions; wall coords and their
  // screen gradients worked out per wall, so lines stay crisp at the corners
  const float W = 1.0, H = 0.5;
  float ax = max(abs(uv.x), 1e-4), ay = max(abs(uv.y), 1e-4);
  float sx = sign(uv.x), sy = sign(uv.y);
  bool wall = W / ax < H / ay;
  float z, u, side;
  vec2 gz, gu;
  if (wall) {
    z = W / ax; u = uv.y * z / H; side = sx;
    gz = vec2(-W * sx / (ax * ax), 0.0);
    gu = (W / H) * vec2(-uv.y * sx / (ax * ax), 1.0 / ax);
  } else {
    z = H / ay; u = uv.x * z / W; side = 2.0 + sy;
    gz = vec2(0.0, -H * sy / (ay * ay));
    gu = (H / W) * vec2(1.0 / ay, -uv.x * sy / (ay * ay));
  }
  z = min(z, 80.0);

  float P = mod(uTokens * 0.02 + iTime * 0.15, 256.0);
  vec2 gc = vec2(u * 4.0, z * 3.0 - P);
  vec2 fw = px * vec2(4.0 * (abs(gu.x) + abs(gu.y)), 3.0 * (abs(gz.x) + abs(gz.y)));
  vec2 gl = abs(fract(gc + 0.5) - 0.5) / max(fw, 1e-5);
  vec2 lines = 1.0 - min(gl, 1.0);
  // fade lines out before they get too fine to resolve, and right at the lens
  float resolve = 1.0 - smoothstep(0.15, 0.45, max(fw.x, fw.y));
  float near = smoothstep(0.85, 1.4, z);
  float fog = exp(-z * 0.16);
  float grid = max(lines.x, lines.y) * resolve * near;

  // token packets: light running along the rails toward you
  vec2 cell = floor(vec2(gc.x, gc.y / 4.0));
  float h = hash12(vec2(mod(cell.y, 64.0), cell.x + side * 31.0));
  float lit = step(h, 0.05 + 0.3 * e);
  float f = fract(gc.y / 4.0);
  float rail = 1.0 - min(abs(fract(gc.x + 0.5) - 0.5) / max(fw.x * 1.6, 1e-5), 1.0);
  float packet = lit * rail * smoothstep(0.0, 0.8, f) * smoothstep(1.0, 0.92, f) * resolve * near;

  vec3 col = vec3(0.006, 0.007, 0.011);
  col += mix(B, A, fog) * grid * fog * (0.5 + 0.45 * e);
  col += mix(mix(A, vec3(1.0), 0.6), B, h * 3.0) * packet * fog * (0.7 + 0.5 * e);
  col += A * packet * fog * 0.2;
  // vanishing point bloom
  float r = length(uv * vec2(0.5, 1.0));
  col += A * exp(-r * 9.0) * (0.12 + 0.3 * e) + mix(A, vec3(1.0), 0.5) * exp(-r * 40.0) * (0.2 + 0.3 * e);
  fragColor = finish(col, fragCoord);
}

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