uniform sampler2D tex;
uniform vec2 offset;
uniform float inter;
uniform float fade;

//vec2 offset = vec2(0.0, 1.0/600.0);
//float inter = 0.2;

void main( void ) {
	gl_FragColor = texture2D(tex, gl_TexCoord[0].st + offset);
	gl_FragColor += texture2D(tex, gl_TexCoord[0].st - offset);
	gl_FragColor = inter*normalize(gl_FragColor) + (1.0 - inter)*gl_FragColor;
	gl_FragColor *= fade;
	//gl_FragColor = sin(gl_FragColor*3.0);

	gl_FragColor -= 0.033*texture2D(tex, gl_TexCoord[0].st + 15.0*offset);
	gl_FragColor -= 0.033*texture2D(tex, gl_TexCoord[0].st - 15.0*offset);

	gl_FragColor.a = 1.0;
}