creating buffer info without initial attrib values

[Vadi]

I didn't know discussions exist in Github.

I'm trying to create a bufferInfo object without any initial data. Below one works, passing empty array for data does not throw error nor works.

This one works:

  const arrays = {
    position: {numComponents:2,  data: [
      0, 0,
      10, 10,
      0, 10,
    ]},
    indices: [
      0, 1, 2,
    ]
  };

  const bufferInfo = twgl.createBufferInfoFromArrays(gl, arrays);

Passing empty array,

  const arrays = {
    position: {numComponents:2,  data: []},
    indices: []
  };

  const bufferInfo = twgl.createBufferInfoFromArrays(gl, arrays);

// .. later in the code, during render

    twgl.setAttribInfoBufferFromArray(
      gl,
      bufferInfo.attribs.position,
      new Float32Array([tri[0], tri[1], tri[2], tri[3], tri[4], tri[5]])
    );

I don't see anything getting rendererd.

QUESTION: Is this valid approach? Or is there a way to setup buffer info during initialization phase.

Thanks!

[greggman]

It's not really clear what you're trying to do. For now you could do this

  const arrays = {
    position: {numComponents:2,  data: new Float32Array(6)},
    indices: new Uint16Array(numIndices),
  };

twgl does not provide a way to update indices. For that you'll have to use raw WebGL.

[Vadi]

You answered my question. I was passing empty arrays to data it doesn't work.