lord help me why glsl

frontend/js/sketch.js

@@ -18,7 +18,6 @@ socket.on("paramUpdate", ({ key, value }) => {
   console.log(`Updated param ${key} to ${value}`);
 });
 
-let bg;
 let cw = 1;
 let ch = 1;
 
@@ -31,23 +30,44 @@ predicament \
 autism alienation and sitting beach \
 this depression's a symptom but it's disease too \
 spaces \
-interiors in berlin city reach peach intention lover drag sleepless depth fear dirt lone";
+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) => {
   let sobel;
-  const imageW = 37418,
-    imageH = 27178;
+  const imageW = 20384,
+    imageH = 28064;
   const tileW = 8192;
-  const tileH = 4096;
+  const tileH = 8192;
   const tileCols = Math.ceil(imageW / tileW);
   const tileRows = Math.ceil(imageH / tileH);
   const tileCount = tileCols * tileRows;
   const tiles = [];
+  const tileTextures = [];
+  let gl;
+  let texArray;
+  let shaderProgram;
+
   p.setup = async () => {
-    // bg = await p.loadImage("assets/scans/1200dpi 16bit grayscale.png");
+    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;
@@ -55,29 +75,28 @@ const sketch = (p) => {
         const w = Math.min(tileW, imageW - x);
         const h = Math.min(tileH, imageH - y);
         promises.push(
-          fetch(
-            `assets/img/tiles/37418x27178_3200dpi_16bit_grayscale/tile_x${x}_y${y}_w${w}_h${h}.png`,
-          )
+          fetch(`assets/img/tiles/tile_x${x}_y${y}_w${w}_h${h}.png`)
             .then((res) => res.arrayBuffer())
             .then((buffer) => {
-              // divide width by 2 because we are colorpacking
-              const p5img = p.createImage(w / 2, h);
-              p5img.loadPixels();
-
-              console.log(
-                `p5img.pixels.length: ${p5img.pixels.length}, p5img.width: ${p5img.width}, p5img.height: ${p5img.height}`,
-              );
-
               const img = UPNG.decode(buffer);
               console.log(
                 `img.data.length: ${img.data.length}, img.width: ${img.width}, img.height: ${img.height}`,
               );
 
-              // BEWARE: weird things happening with dimension of the loaded image (4096 values too many)
-              for (let i = 0; i < w * h * 4; i++) {
-                p5img.pixels[i] = img.data[i];
-              }
-              tiles[row * tileCols + column] = img;
+              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,
+                img.data,
+              );
               n_downloaded++;
               console.log(
                 `Downloaded ${n_downloaded} / ${tileCount} (${Math.round((n_downloaded / tileCount) * 100)}%) tiles`,
@@ -87,14 +106,18 @@ const sketch = (p) => {
       }
     }
     await Promise.all(promises);
-    p.createCanvas(p.windowWidth, p.windowHeight, p.WEBGL);
-    const shaderFile = await fetch("shader/sobel.frag");
-    const shaderText = await shaderFile.text();
-    sobel = p.createFilterShader(shaderText);
-    console.log(
-      "Max texture size:",
-      p._renderer.GL.getParameter(p._renderer.GL.MAX_TEXTURE_SIZE),
-    );
+
+    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 = p.loadShader("shader/shader.vert", "shader/shader.frag");
+
+    // const shaderFile = await fetch("shader/sobel.frag");
+    // const shaderText = await shaderFile.text();
+    // sobel = p.createFilterShader(shaderText);
+
     // const stream = c.elt.captureStream(60);
   };
 
@@ -160,7 +183,22 @@ const sketch = (p) => {
     p.text(word, bounds.x, bounds.y + p.textAscent());
   }
 
-  function drawTiles(x, y, width, height) {}
+  function drawTiles(x, y, width, height) {
+    p.ortho(x, x + width, y, y + height);
+    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++
+      ) {
+        p.image(tiles[row * tileCols + col], col * tileW, row * tileH);
+      }
+    }
+  }
 };
 
 new p5(sketch);