`#version 300 es
 
// an attribute is an input (in) to a vertex shader.
// It will receive data from a buffer

//WebGL1 attribute vec4 aVertexPosition;
in vec4 aVertexPosition;

// all shaders have a main function
void main() {
 
  // gl_Position is a special variable a vertex shader
  // is responsible for setting
    gl_Position = aVertexPosition ;

  }`