#version 110

uniform sampler2D tex;
uniform vec4 color;

varying vec2 v_tex;

void main()
{
  vec4 t = texture2D(tex, v_tex);
  gl_FragColor.rgb = vec3(dot(t.rgb, vec3(0.3, 0.59, 0.11)));
  gl_FragColor.a = t.a;
}