text: export const vertexShaderSource = `\
  attribute vec4 aPosition;
  attribute vec3 aColor;
  attribute vec3 aNormal;
  
  uniform mat4 uMVPMatrix;
  
  varying mediump vec4 vColor;
  
  void main() {
    gl_Position = uMVPMatrix * aPosition;
    vColor = aColor;
  }
  `
  export const fragmentShaderSource = `\
  precision mediump float;
  
  varying vec4 vColor;
  
  void main() {
    gl_FragColor = vColor;
  }
  `
  