block1.javascript

// construct the pixel data
const floatArray = new Float32Array([ /* pixels */ ]);
const uintArray = new Uint8Array(floatArray.buffer);

// bind the pixel data to a WebGL texture
gl.texImage2D(
  gl.TEXTURE_2D,    // target
  0,                // mipmap level
  gl.RGBA,          // internal format: 4 color channels
  width,            // width of texture in pixels
  height,           // height of texture in pixels
  0,                // border: must be 0
  gl.RGBA,          // format: must be the same as internal format
  gl.UNSIGNED_BYTE, // type: 8 bits per channel
  uintArray,        // pixels
);