const WaveShaderMaterial = shaderMaterial(
// uniforms
  { uTime: 0, uTexture: new THREE.Texture() },
// vertex
  glsl'
    varying vec2 vUv;
    void main() {
      vUv = uv;
      gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.0);
    }
  ',
// fragment
  glsl'
    precision mediump float;
    uniform float uTime;
    uniform sampler2D uTexture;
    varying vec2 vUv;
    void main() {
      vec3 texture = texture2D(uTexture, vUv).rgb;
      gl_FragColor = vec4(texture, 1.0);
    }
  '
)
extend({ WaveShaderMaterial })