noise-fields/frontend/js/sketch.js

import p5 from "p5";
import io from "socket.io-client";
const socket = io("http://localhost:3000");

const params = {
  fps: 60,
  zoom: 1, //in pixels per pixel
  backgroundTicks: 60,
  disableScreen: false,
  textSpread: 0,
  maxSpawns: 1,
  textAlpha: 0.0,
  textTicks: 1,
};

socket.on("paramUpdate", ({ key, value }) => {
  params[key] = value;
  console.log(`Updated param ${key} to ${value}`);
});

let bgTick = 0;
socket.on("pulse", () => {
  bgTick = 0;
});

const poem =
  "everybody is pretty ugly \
lover \
you are my mirror \
I can't judge this \
predicament \
autism alienation and sitting beach \
this depression's a symptom but it's disease too \
spaces \
interiors in city reach peach intention lover drag sleepless depth fear dirt lone";
const realText = poem.split(" ").filter((t) => t.length > 0);

const sketch = (p) => {
  const imageW = 20384,
    imageH = 28064;
  const tileW = 8192;
  const tileH = 8192;
  const tileCols = Math.ceil(imageW / tileW);
  const tileRows = Math.ceil(imageH / tileH);
  const tileCount = tileCols * tileRows;
  const aleph = 0; // to fix tile gaps
  let gl;
  let texArray;
  let shaderProgram;

  p.setup = async () => {
    p.createCanvas(p.windowWidth, p.windowHeight, p.WEBGL);
    // Check for correct webgl version
    gl = p._renderer.GL;
    if (!(gl instanceof WebGL2RenderingContext)) {
      console.error("WebGL2 required!");
    } else {
      console.log("WebGL2 supported!");
    }

    // Create texture array
    texArray = gl.createTexture();
    gl.bindTexture(gl.TEXTURE_2D_ARRAY, texArray);

    // Allocate texture storage
    gl.texStorage3D(gl.TEXTURE_2D_ARRAY, 1, gl.R8, tileW, tileH, tileCount);

    const promises = [];
    let n_downloaded = 0;

    for (let row = 0; row < tileRows; row++) {
      for (let column = 0; column < tileCols; column++) {
        const x = column * tileW;
        const y = row * tileH;
        const w = Math.min(tileW, imageW - x);
        const h = Math.min(tileH, imageH - y);
        promises.push(
          p
            .loadImage(`assets/img/tiles/tile_x${x}_y${y}_w${w}_h${h}.png`)
            .then((img) => {
              img.loadPixels();
              let pixels = new Uint8Array(img.width * img.height);
              for (let i = 0; i < img.pixels.length; i++) {
                pixels[i] = img.pixels[i * 4];
              }
              const i = row * tileCols + column;
              gl.texSubImage3D(
                gl.TEXTURE_2D_ARRAY,
                0,
                0,
                0,
                i,
                img.width,
                img.height,
                1,
                gl.RED,
                gl.UNSIGNED_BYTE,
                pixels,
              );
              n_downloaded++;
              console.log(
                `Downloaded ${n_downloaded} / ${tileCount} (${Math.round((n_downloaded / tileCount) * 100)}%) tiles`,
              );
            }),
        );
      }
    }
    await Promise.all(promises);

    gl.texParameteri(gl.TEXTURE_2D_ARRAY, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
    gl.texParameteri(gl.TEXTURE_2D_ARRAY, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
    gl.texParameteri(gl.TEXTURE_2D_ARRAY, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
    gl.texParameteri(gl.TEXTURE_2D_ARRAY, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);

    shaderProgram = await p.loadShader(
      "shader/shader.vert",
      "shader/shader.frag",
    );
    console.log(shaderProgram);

    // const shaderFile = await fetch("shader/sobel.frag");
    // const shaderText = await shaderFile.text();
    // sobel = p.createFilterShader(shaderText);

    // const stream = c.elt.captureStream(60);
  };

  let textTick = 0;
  let sx, sy;
  let cw, ch;
  let word, bounds;

  p.draw = () => {
    p.background(220);
    // update scale
    p.setFrameRate(params.fps);

    bgTick %= params.backgroundTicks;

    // current width/height

    if (bgTick++ == 0) {
      cw = Math.floor(p.width * params.zoom);
      ch = Math.floor(p.height * params.zoom);
      // random starting position
      // subtract cw/ch to avoid going out of bounds
      sx = Math.random(0) * (imageW - cw);
      sy = Math.random(0) * (imageH - ch);
    }

    textTick %= params.textTicks;
    if (textTick++ == 0) {
      (word, (bounds = nextText()));
    }
    drawTiles(sx, sy, cw, ch);
    if (word && bounds) drawText(word, bounds);
  };

  function nextText() {
    for (let i = 0; i < Math.random() * params.maxSpawns; i++) {
      const word = realText[Math.floor(Math.random() * realText.length)];
      const wx =
        p.windowWidth / 2 -
        p.textWidth(word) / 2 +
        p.random(-params.textSpread, params.textSpread);
      const wy =
        p.windowHeight / 2 -
        p.textAscent() / 2 +
        p.random(-params.textSpread, params.textSpread);
      const bounds = p.textBounds(word, wx, wy);
      return { word, bounds };
    }
  }

  function drawText(word, bounds) {
    const whitespace = 2;
    p.stroke(0, 0, 0, params.textAlpha);
    p.fill(255, 255, 255, params.textAlpha);
    p.rect(
      bounds.x - whitespace,
      bounds.y - whitespace,
      bounds.w + 2 * whitespace,
      bounds.h + 2 * whitespace,
    );

    p.noStroke();
    p.fill(0, 0, 0, params.textAlpha);
    p.text(word, bounds.x, bounds.y + p.textAscent());
  }

  function drawTiles(x, y, width, height) {
    // clear screen
    p.background(p.color(1, 0, 0, 0));
    if (params.disableScreen) return;

    p.shader(shaderProgram);
    // p.ortho(0, p.width, -p.height, 0);
    p.ortho(x, x + width, -y - height, -y);

    // Bind texture array
    gl.activeTexture(gl.TEXTURE0);
    gl.bindTexture(gl.TEXTURE_2D_ARRAY, texArray);

    for (
      let row = Math.floor(y / tileW);
      row <= Math.floor((y + height) / tileW);
      row++
    ) {
      for (
        let col = Math.floor(x / tileW);
        col <= Math.floor((x + width) / tileW);
        col++
      ) {
        const currentLayer = row * tileCols + col;
        // Tell shader which layer to sample
        shaderProgram.setUniform("uLayer", currentLayer);
        p.noStroke();
        p.rect(
          col * tileW - aleph,
          row * tileH - aleph,
          tileW + 2 * aleph,
          tileH + 2 * aleph,
        );
        // p.rect(0, 0, tileW, tileH);
      }
    }
  }
};

new p5(sketch);