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#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;
}
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