Spark Burst

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-spark-burst" data-tps="95" data-color="#ff8a3d" 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-spark-burst");
  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
uint hu(uint x) { x ^= x >> 16u; x *= 0x7feb352du; x ^= x >> 15u; x *= 0x846ca68bu; x ^= x >> 16u; return x; }
float hf(uint x) { return float(hu(x) >> 8u) * (1.0 / 16777216.0); }
float h1(float a) { return hf(uint(int(floor(a)))); }
float h2(vec2 a) { ivec2 i = ivec2(floor(a)); return hf(uint(i.x) * 0x27d4eb2du ^ hu(uint(i.y) + 0x9e3779b9u)); }
float h3(vec3 a) { ivec3 i = ivec3(floor(a)); return hf(uint(i.x) * 0x27d4eb2du ^ hu(uint(i.y) * 0x165667b1u ^ hu(uint(i.z) + 0x9e3779b9u))); }
float segd(vec2 p, vec2 a, vec2 b, out float t) {
  vec2 pa = p - a, ba = b - a;
  t = clamp(dot(pa, ba) / max(dot(ba, ba), 1e-9), 0.0, 1.0);
  return length(pa - ba * t);
}
vec3 tone(vec3 c) { return 1.0 - exp(-c); }
float dither(vec2 f) { return (h2(f) - 0.5) / 255.0; }
// 0 at idle, about 0.23 at 15 tok/s, 0.46 at 60, 0.7 at 200, 1 at 800
float energy() { return clamp(log2(1.0 + max(uTps, 0.0) / 8.0) / log2(101.0), 0.0, 1.0); }

vec2 sparkPos(vec2 o, vec2 dir, float v0, float tau) {
  return o + dir * v0 * (1.0 - exp(-1.3 * tau)) / 1.3 - vec2(0.0, 0.45 * tau * tau);
}

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();
  float tk = mod(uTokens, 65536.0);
  float it = mod(iTime, 4096.0);
  vec2 o = vec2(0.0, -0.02);

  vec3 col = vec3(0.005, 0.004, 0.006) + uColor * 0.018 * (1.0 - uv.y);
  for (int i = 0; i < 48; i++) {
    float fi = float(i);
    float vis = smoothstep(fi - 1.5, fi + 1.5, 16.0 + 34.0 * e);
    if (vis <= 0.0) break;
    float n = 7.0 + floor(h1(fi * 5.0 + 1.0) * 5.0);
    float q = tk * n / 1024.0 + it * n / 64.0 + h1(fi * 5.0 + 2.0);
    float age = fract(q);
    float cyc = mod(floor(q), 64.0);
    float s1 = h3(vec3(fi, cyc, 1.0)), s2 = h3(vec3(fi, cyc, 2.0)), s3 = h3(vec3(fi, cyc, 3.0));
    float ang = 1.5708 + (s1 - 0.5) * 2.9;
    vec2 dir = vec2(cos(ang), sin(ang));
    float v0 = mix(0.55, 2.0, s2 * s2);
    float life = mix(0.8, 1.35, s3);
    float tau = age * life;
    float cps = max(uTps, 0.0) * n / 1024.0 + n / 64.0;
    float dt = clamp(cps * life * 0.06, 0.006, 0.36);
    vec2 a = sparkPos(o, dir * vec2(1.3, 1.0), v0, tau);
    vec2 b = sparkPos(o, dir * vec2(1.3, 1.0), v0, max(tau - dt, 0.0));
    float tt;
    float d = segd(uv, a, b, tt);
    float heat = 1.0 - age;
    float w = 0.0026 * (0.6 + 0.7 * heat) + px * 0.35;
    float I = pow(heat, 0.8) * smoothstep(0.0, 0.03, age) * 1.3;
    float shape = smoothstep(w + px, w - px, d) + w * w * 5.0 / (d * d + w * w * 5.0) * 0.45;
    shape *= mix(1.0, 0.3, tt);
    vec3 sc = mix(uColor * 0.7, mix(uColor, vec3(1.0, 0.96, 0.9), 0.8), heat * heat);
    col += sc * I * shape * vis * (0.9 + 0.5 * e);
  }
  // the hot point everything is thrown from
  vec2 d0 = uv - o;
  float r2 = dot(d0, d0);
  col += mix(uColor, vec3(1.0), 0.7) * exp(-r2 / 0.0006) * (0.8 + 1.2 * e);
  col += uColor * 0.005 / (r2 + 0.005) * (0.18 + 0.4 * e);
  col += mix(uColor, vec3(1.0), 0.3) * exp(-abs(d0.y) * 110.0) * exp(-abs(d0.x) * 3.5) * (0.04 + 0.2 * e);

  col *= 1.0 - 0.25 * dot(uv * vec2(0.5, 1.0), uv * vec2(0.5, 1.0));
  col = tone(col * 1.25);
  fragColor = vec4(col + dither(fragCoord), 1.0);
}

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 95.0
#define uTokens (iTime * uTps)
#define uColor vec3(1.000, 0.541, 0.239)

#define TAU 6.28318530718
uint hu(uint x) { x ^= x >> 16u; x *= 0x7feb352du; x ^= x >> 15u; x *= 0x846ca68bu; x ^= x >> 16u; return x; }
float hf(uint x) { return float(hu(x) >> 8u) * (1.0 / 16777216.0); }
float h1(float a) { return hf(uint(int(floor(a)))); }
float h2(vec2 a) { ivec2 i = ivec2(floor(a)); return hf(uint(i.x) * 0x27d4eb2du ^ hu(uint(i.y) + 0x9e3779b9u)); }
float h3(vec3 a) { ivec3 i = ivec3(floor(a)); return hf(uint(i.x) * 0x27d4eb2du ^ hu(uint(i.y) * 0x165667b1u ^ hu(uint(i.z) + 0x9e3779b9u))); }
float segd(vec2 p, vec2 a, vec2 b, out float t) {
  vec2 pa = p - a, ba = b - a;
  t = clamp(dot(pa, ba) / max(dot(ba, ba), 1e-9), 0.0, 1.0);
  return length(pa - ba * t);
}
vec3 tone(vec3 c) { return 1.0 - exp(-c); }
float dither(vec2 f) { return (h2(f) - 0.5) / 255.0; }
// 0 at idle, about 0.23 at 15 tok/s, 0.46 at 60, 0.7 at 200, 1 at 800
float energy() { return clamp(log2(1.0 + max(uTps, 0.0) / 8.0) / log2(101.0), 0.0, 1.0); }

vec2 sparkPos(vec2 o, vec2 dir, float v0, float tau) {
  return o + dir * v0 * (1.0 - exp(-1.3 * tau)) / 1.3 - vec2(0.0, 0.45 * tau * tau);
}

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();
  float tk = mod(uTokens, 65536.0);
  float it = mod(iTime, 4096.0);
  vec2 o = vec2(0.0, -0.02);

  vec3 col = vec3(0.005, 0.004, 0.006) + uColor * 0.018 * (1.0 - uv.y);
  for (int i = 0; i < 48; i++) {
    float fi = float(i);
    float vis = smoothstep(fi - 1.5, fi + 1.5, 16.0 + 34.0 * e);
    if (vis <= 0.0) break;
    float n = 7.0 + floor(h1(fi * 5.0 + 1.0) * 5.0);
    float q = tk * n / 1024.0 + it * n / 64.0 + h1(fi * 5.0 + 2.0);
    float age = fract(q);
    float cyc = mod(floor(q), 64.0);
    float s1 = h3(vec3(fi, cyc, 1.0)), s2 = h3(vec3(fi, cyc, 2.0)), s3 = h3(vec3(fi, cyc, 3.0));
    float ang = 1.5708 + (s1 - 0.5) * 2.9;
    vec2 dir = vec2(cos(ang), sin(ang));
    float v0 = mix(0.55, 2.0, s2 * s2);
    float life = mix(0.8, 1.35, s3);
    float tau = age * life;
    float cps = max(uTps, 0.0) * n / 1024.0 + n / 64.0;
    float dt = clamp(cps * life * 0.06, 0.006, 0.36);
    vec2 a = sparkPos(o, dir * vec2(1.3, 1.0), v0, tau);
    vec2 b = sparkPos(o, dir * vec2(1.3, 1.0), v0, max(tau - dt, 0.0));
    float tt;
    float d = segd(uv, a, b, tt);
    float heat = 1.0 - age;
    float w = 0.0026 * (0.6 + 0.7 * heat) + px * 0.35;
    float I = pow(heat, 0.8) * smoothstep(0.0, 0.03, age) * 1.3;
    float shape = smoothstep(w + px, w - px, d) + w * w * 5.0 / (d * d + w * w * 5.0) * 0.45;
    shape *= mix(1.0, 0.3, tt);
    vec3 sc = mix(uColor * 0.7, mix(uColor, vec3(1.0, 0.96, 0.9), 0.8), heat * heat);
    col += sc * I * shape * vis * (0.9 + 0.5 * e);
  }
  // the hot point everything is thrown from
  vec2 d0 = uv - o;
  float r2 = dot(d0, d0);
  col += mix(uColor, vec3(1.0), 0.7) * exp(-r2 / 0.0006) * (0.8 + 1.2 * e);
  col += uColor * 0.005 / (r2 + 0.005) * (0.18 + 0.4 * e);
  col += mix(uColor, vec3(1.0), 0.3) * exp(-abs(d0.y) * 110.0) * exp(-abs(d0.x) * 3.5) * (0.04 + 0.2 * e);

  col *= 1.0 - 0.25 * dot(uv * vec2(0.5, 1.0), uv * vec2(0.5, 1.0));
  col = tone(col * 1.25);
  fragColor = vec4(col + dither(fragCoord), 1.0);
}

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