import UIKit
import ARKit

class EffectNodeHelper {
  static func getAlphaShader() -> SKShader {
   return SKShader(source: """
   void main() {
   vec2 texCoords = v_tex_coord;
   vec2 colorCoords = vec2(texCoords.x, texCoords.y);
   vec2 alphaCoords = vec2(texCoords.x, texCoords.y);
   vec4 color = texture2D(u_texture, colorCoords);
   float alpha = texture2D(u_texture, alphaCoords).r;
   gl_FragColor = vec4(color.rgb, alpha);
   }
   """)
  }
}