#ifdef GL_ES
#ifdef GL_FRAGMENT_PRECISION_HIGH
precision highp float;
#else
precision mediump float;
#endif
#endif
uniform sampler2D tex;
varying vec4 col;
varying vec2 tex_c;
void main()
{
	vec3 inp = texture2D(tex,tex_c.xy).abg;
	vec4 sep;
	sep.r = dot(inp, vec3(.393, .769, .189));
	sep.g = dot(inp, vec3(.349, .686, .168));
	sep.b = dot(inp, vec3(.272, .534, .131));
	sep.a = texture2D(tex,tex_c.xy).r;
	gl_FragColor = sep * col;
}