 and webgl-lessons-ui.
-->
<script src="resources/webgl-utils.js"></script>
<script src="resources/webgl-lessons-ui.js"></script>
<script>
"use strict";

var vertexShaderSource = `#version 300 es

// an attribute is an input (in) to a vertex shader.
// It will receive data from a buffer
in vec2 a_position;

// A matrix to transform the positions by
uniform mat3 u_matrix;

// all shaders have a main function
void main() {
  // Multiply the position by the matrix.
  gl_Position = vec4((u_matrix * vec3(a_posit