uniform sampler2D _RampTex;
uniform float _RampOffset;
uniform sampler2D _MainTex;
void main ()
{
  vec4 xlat_var_output;
  vec4 tmpvar_1;
  tmpvar_1 = texture2D (_MainTex, gl_TexCoord[0].xy);
  vec2 tmpvar_2;
  tmpvar_2.y = 0.5;
  tmpvar_2.x = (dot (tmpvar_1.xyz, vec3(0.22, 0.707, 0.071)) + _RampOffset);
  xlat_var_output = texture2D (_RampTex, tmpvar_2);
  xlat_var_output.w = tmpvar_1.w;
  gl_FragData[0] = xlat_var_output;
}