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