How to draw squared dot on PointCloudLayer ?

[kaorukitao]

I want to draw point cloud using PointCloudLayer. I found "if" clause on the fragment shader of PointCloudLayer. I want to remove it because of improvement of performance. So I created LightPointCloudLayer extended from PointCloudLayer like this;

#version 300 es
#define SHADER_NAME light-point-cloud-layer-fragment-shader
precision highp float;
in vec4 vColor;
in vec2 unitPosition;
out vec4 fragColor;
void main(void) {
  geometry.uv = unitPosition;
  // float distToCenter = length(unitPosition);
  // if (distToCenter > 1.0) {
  // 	discard;
  // }
  fragColor = vColor;
  DECKGL_FILTER_COLOR(fragColor, geometry);
}

export class LightPointCloudLayer extends PointCloudLayer {
  getShaders () {
    return Layer.prototype.getShaders.call( this, {
      vs,
      fs: lfs,
      modules: [ project32, gouraudLighting, picking ]
    });
  }
}

I expected the squared dot drawn but triangular. Because I thought that gl.drawArrays(gl.drawElements) using primitive "gl.POINTS" create squared dot.

I want to know why triangular dot is drawn.
How do I draw a point with quared dot ?