tiw/visual.html at main · numtel/tiw · GitHub

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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>transimminent.world</title>
<style>
@font-face {
  font-family: "RubikGlitch";
  src: url(fonts/RubikGlitch-Regular.ttf);
}
body{
  margin:0;
  padding:0;
  overflow:hidden;
  font-family:RubikGlitch; /*otherwise it won't be loaded for the texture immediately*/
}
#scene {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
}
</style>
</head>
<body>
<canvas id="scene"></canvas>
<script>
  const canvas = document.getElementById('scene');

  canvas.width = window.innerWidth;
  canvas.height = window.innerHeight;

  const gl = canvas.getContext('webgl2');

  if(!gl)
    throw new Error('webgl2_required');

  gl.clearColor(0, 0, 0, 1);

  // Vertex Shader
  const vsSource = `#version 300 es
    precision highp float;
    layout (location=0) in vec4 position;
    layout (location=1) in vec2 uv;

    out vec2 uv_pos;

    void main() {
      uv_pos = uv;
      gl_Position = position;
    }`;

  // Fragment shader
  const fsSource = `#version 300 es
precision highp float;
precision highp int;

in vec2 uv_pos;
out vec4 fragColor;

uniform uvec4 u_work0;
uniform uvec4 u_work1;
uniform float u_time;

// device orientation (x = roll, y = pitch, z = yaw)
uniform vec3 u_orientation;

uniform sampler2D u_text;

// --- simple hash-based 2D noise ---
float hash21(vec2 p) {
  // cheap, tileable-ish hash
  p = fract(p * vec2(123.34, 345.45));
  p += dot(p, p + 34.345);
  return fract(p.x * p.y);
}

// scrolling grain texture in pixel space
float grainNoise(vec2 p, float time, float frameRand) {
  // scale to "texture" space
  vec2 q = p * 0.015;       // smaller = bigger grain, larger = finer grain
  q.y += cos(time) * 6.;        // scroll upward over time

  float n  = hash21(q);
  n       += 0.5 * hash21(q * 2.3 + 7.1); // second octave for extra grit
  n       /= 1.5;

  // mix in a small per-frame random factor so the noise isn't perfectly repeatable
  n = mix(n, frameRand, 0.15);
  return n;
}

void main() {
  // Pixel coordinates
  float px = uv_pos.x * 1919.;  // ${canvas.width - 1}.
  float py = uv_pos.y * 1079.;  // ${canvas.height - 1}.

  // Centered UV for "3D" perspective tricks
  vec2 p = uv_pos * 2.0 - 1.0;

  // Interpret orientation:
  //  x ~ roll (tilt left/right)
  //  y ~ pitch (tilt forward/back)
  //  z ~ yaw (twist)
  float tiltX = u_orientation.x;
  float tiltY = u_orientation.y;
  float twist = u_orientation.z;

  // Fake depth: fragments "near" the viewer vs "far"
  float depth = 0.5 + 0.5 * (p.y * tiltY - p.x * tiltX);
  depth = clamp(depth, 0.0, 1.0);

  // --- RED: radial sunburst from bottom-center, rotating over time ---
  // Move origin slightly with tilt so it feels like a 3D light
  vec2 origin = vec2(
    0.5 + tiltX * 0.15,
    1.2 + tiltY * 0.25
  );

  vec2 dir = uv_pos - origin;     // vector from origin to fragment
  float angle = atan(dir.y, dir.x);  // [-pi, pi]

  float numRays = ((cos(u_time/4.)*0.25) + 1.) * 40.0;
  float rotationSpeed = ((cos(u_time/4.)*0.25) + 1.) * 4.7;

  // Parallax: rays pack closer together when "far" and spread when "near"
  float rayParallax = mix(0.6, 1.6, depth);

  float baseRed = 0.5 + 0.5 * cos(
    angle * numRays * rayParallax
    - cos(u_time) * rotationSpeed
    + twist * 2.5            // twist the whole fan when you rotate the device
  );

  // Slightly fade red with depth so it looks like it's receding
  baseRed *= mix(0.6, 1.2, 1.0 - depth);

  // --- GREEN: vertical bars with 3D skew ---
  // Cycle between 60-120 px every ~18 seconds (time/3 radians)
  float baseBarSize = (cos(u_time/3.) + 1.) * 60.0;
  float barScale = mix(8.0, 1.0, uv_pos.y); // 8x at top → 1x at bottom
  float barPx = baseBarSize * barScale;

  float greenSpeed = 80.0;

  // skew bars with roll so they lean in 3D
  float skew = tiltX * 0.5;
  float depthScroll = mix(0.6, 1.4, depth);

  float coord = (py + greenSpeed * depthScroll) / barPx;
  coord += p.x * skew;  // sideways parallax

  float baseGreen = sin(fract(coord) * 3.1415926);

  // Boost green when "near" so bars feel like they're coming out of the screen
  baseGreen *= mix(0.5, 1.6, depth);

  // --- Gritty scrolling texture ---
  // slow flicker: grain changes only a few times per second
  float flickerRate = 0.1; // flickers per second (lower = slower)
  float flickerStep = floor(u_time * flickerRate) / flickerRate;

  // stable random per flicker step
  float frameRand = fract(sin(flickerStep * 43758.19) * 43758.5453);

  // grain in pixel space, scrolling with time
  float grain = grainNoise(vec2(px, py), u_time, frameRand);

  // center around 0 and scale
  float grainAmt = 0.60;                 // overall grain strength
  float g = (grain - 0.5) * grainAmt;

  // --- Apply texture to colors ---
  float red   = clamp(baseRed   * 0.5 + g * 1.2, 0.0, 1.0);
  float green = clamp(baseGreen * 0.5 + g * 1.0, 0.0, 1.0);

  // subtle blue haze so the scene feels more like stage light through fog
  float blueBase = 0.08 + 0.12 * (1.0 - uv_pos.y); // slightly brighter near top
  float blue = clamp(blueBase + g * 0.6, 0.0, 1.0);

  vec4 color = vec4(red, green, blue, 1.0);

  // --- WORDS embedded in bands ---

  // Compute a UV for the scrolling / tilting green bands so the
  // text "sticks" to them and follows orientation / mouse input.
  float bandPhase = fract(coord);      // local position inside a band [0,1)
  float bandIndex = floor(coord);      // which band we are in (unused but kept for tweakability)

  // Start from the original screen UV
  vec2 textUV = uv_pos;
  textUV.x = 1. - textUV.x;

  // Slide text vertically with the band motion
  // (so when the bands scroll, the text scrolls with them).
  textUV.y = bandPhase;

  // Add a bit of parallax / skew from orientation so
  // rotating the device or moving the mouse also nudges the text.
  textUV.x += p.x * skew * 0.35 + tiltX * 0.15 + twist * 0.05;

  // Keep things mostly inside the texture domain
  textUV = clamp(textUV, 0.0, 1.0);

  // u_text should be white text on transparent/black background.
  vec4 textSample = texture(u_text, textUV);

  // how "strong" the word is (use alpha or luminance)
  float textMask = clamp(textSample.a + max(textSample.r, max(textSample.g, textSample.b)), 0.0, 1.0);

  // make words only really show where the green band is strong
  float bandMask = smoothstep(0.4, 0.9, baseGreen);

  float wordMask = textMask * bandMask;

  // tint for the words (slightly brighter greenish)
  vec3 wordColor = vec3(0.8, 1.0, 0.9);

  // blend words over the existing color
  color.rgb = mix(color.rgb, wordColor, wordMask * ((cos(u_time*3.) + 0.4) * 0.08));

  fragColor = color;
}

`;

  // ---- FIXED: more robust shader creation ----
  function createShader(gl, type, source) {
    const shader = gl.createShader(type);
    gl.shaderSource(shader, source);
    gl.compileShader(shader);

    const success = gl.getShaderParameter(shader, gl.COMPILE_STATUS);
    const info = gl.getShaderInfoLog(shader);

    if (!success) {
      console.error('Shader compile error:', info);
      gl.deleteShader(shader);
      throw new Error(info || 'Shader compile error');
    }

    if (info) {
      console.warn('Shader compile log:', info);
    }

    return shader;
  }

  // ---- FIXED: more robust program creation ----
  function createProgram(gl, vertexShader, fragmentShader) {
    const program = gl.createProgram();
    gl.attachShader(program, vertexShader);
    gl.attachShader(program, fragmentShader);
    gl.linkProgram(program);

    const success = gl.getProgramParameter(program, gl.LINK_STATUS);
    const info = gl.getProgramInfoLog(program);

    if (!success) {
      console.error('Program link error:', info);
      gl.deleteProgram(program);
      throw new Error(info || 'Program link error');
    }

    if (info) {
      console.warn('Program link log:', info);
    }

    return program;
  }

  const vertexShader = createShader(gl, gl.VERTEX_SHADER, vsSource);
  const fragmentShader = createShader(gl, gl.FRAGMENT_SHADER, fsSource);

  const program = createProgram(gl, vertexShader, fragmentShader);
  gl.useProgram(program);

  // Vertex Positions
  const positions = new Float32Array([
    -1,-1,0, -1,1,0, 1,1,0,
    1,-1,0, 1,1,0, -1,-1,0
  ]);
  const positionBuffer = gl.createBuffer();
  gl.bindBuffer(gl.ARRAY_BUFFER, positionBuffer);
  gl.bufferData(gl.ARRAY_BUFFER, positions, gl.STATIC_DRAW);
  gl.vertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0);
  gl.enableVertexAttribArray(0);

  // Texture Positions
  const uvPosArray = new Float32Array([
    1,1, 1,0, 0,0,   0,1, 0,0, 1,1
  ]);
  const uvBuffer = gl.createBuffer();
  gl.bindBuffer(gl.ARRAY_BUFFER, uvBuffer);
  gl.bufferData(gl.ARRAY_BUFFER, uvPosArray, gl.STATIC_DRAW);
  gl.vertexAttribPointer(1, 2, gl.FLOAT, false, 0, 0);
  gl.enableVertexAttribArray(1);

  const work0Location = gl.getUniformLocation(program, 'u_work0');
  const work1Location = gl.getUniformLocation(program, 'u_work1');
  const timeLocation  = gl.getUniformLocation(program, 'u_time');
  const orientationLocation = gl.getUniformLocation(program, 'u_orientation');

  const work0 = new Uint8Array(4);
  const work1 = new Uint8Array(4);

  // current orientation: [roll, pitch, yaw]
  const orientation = new Float32Array(3);
  let hasDeviceOrientation = false;

  const textCanvas = document.createElement('canvas');
  textCanvas.width  = 1024;
  textCanvas.height = 256;
  const textCtx = textCanvas.getContext('2d');

  function clearTextCanvas() {
    textCtx.clearRect(0, 0, textCanvas.width, textCanvas.height);
  }

  function drawWord(word) {
    clearTextCanvas();
    textCtx.font = 'bold 160px RubikGlitch, sans-serif';
    textCtx.textAlign = 'center';
    textCtx.textBaseline = 'middle';
    textCtx.fillStyle = 'white'; // white text, transparent background
    textCtx.fillText(word, textCanvas.width / 2, textCanvas.height / 2);
  }

  const textTexture = gl.createTexture();
  gl.bindTexture(gl.TEXTURE_2D, textTexture);
  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.CLAMP_TO_EDGE);
  gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);

  // initial upload (blank)
  gl.texImage2D(
    gl.TEXTURE_2D,
    0,
    gl.RGBA,
    gl.RGBA,
    gl.UNSIGNED_BYTE,
    textCanvas
  );

  const textLocation = gl.getUniformLocation(program, 'u_text');
  gl.uniform1i(textLocation, 0); // we’ll use texture unit 0

  const words = ['EXPLORE', 'TRANSITION', 'LOVE', 'BEAUTY', 'FEELING', 'TOGETHER', 'PERSEPECTIVE']; // whatever you like
  let showText = false;
  let lastChange = 0;

  function updateTextForTime(timeMs) {
    // change state every 3 seconds
    if (timeMs - lastChange < 3000) return;
    lastChange = timeMs;

    // 80% chance to show a word
    if (Math.random() < 0.8) {
      showText = true;
      const w = words[Math.floor(Math.random() * words.length)];
      drawWord(w);
    } else {
      showText = false;
      clearTextCanvas();
    }

    gl.bindTexture(gl.TEXTURE_2D, textTexture);
    gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, textCanvas);
  }

  // Device orientation (mobile / tablet)
  if (window.DeviceOrientationEvent) {
    window.addEventListener('deviceorientation', (event) => {
      // event.beta  : [-180, 180] front/back (pitch)
      // event.gamma : [-90,  90]  left/right (roll)
      // event.alpha : [0,    360] compass (yaw)
      const beta  = (event.beta-90  || 0) * Math.PI / 180.0;
      const gamma = (event.gamma || 0) * Math.PI / 180.0;
      const alpha = (event.alpha || 0) * Math.PI / 180.0;

      const roll  = Math.sin(gamma);
      const pitch = Math.sin(beta);
      const yaw   = Math.sin(alpha);

      orientation[0] = roll;
      orientation[1] = pitch;
      orientation[2] = yaw;

      hasDeviceOrientation = true;
    }, true);
  }

  // Mouse position fallback (desktop / sensors unavailable)
  window.addEventListener('mousemove', (event) => {
    // If we're already getting sensor data, don't override it
    if (hasDeviceOrientation) return;

    const x = (event.clientX / window.innerWidth) * 2.0 - 1.0; // [-1, 1]
    const y = (event.clientY / window.innerHeight) * 2.0 - 1.0;

    const roll  = x;        // tilt left/right
    const pitch = -y;       // tilt forward/back
    const yaw   = 0.5 * x;  // subtle twist

    orientation[0] = roll;
    orientation[1] = pitch;
    orientation[2] = yaw;
  });

  function draw(time) {
    window.crypto.getRandomValues(work0);
    window.crypto.getRandomValues(work1);

    gl.uniform4uiv(work0Location, Array.from(work0));
    gl.uniform4uiv(work1Location, Array.from(work1));
    gl.uniform3fv(orientationLocation, orientation);
    gl.uniform1f(timeLocation, time * 0.001);
    updateTextForTime(time);
    gl.activeTexture(gl.TEXTURE0);
    gl.bindTexture(gl.TEXTURE_2D, textTexture);

    gl.clear(gl.COLOR_BUFFER_BIT);
    gl.drawArrays(gl.TRIANGLES, 0, 6);

    window.requestAnimationFrame(draw);
  }

  // Begin generation
  window.requestAnimationFrame(draw);
</script>

</body>
</html>