uniform sampler2D inTex;
uniform vec2 texSz;
uniform float kerSz;

void main (void )
{
	vec2 texCoord = gl_FragCoord.xy / texSz;

	vec4 color = vec4(0.0, 0.0, 0.0, 0.0);

	for( int i = -kerSz; i <= kerSz; i++ )
		for (int j = -kerSz; j <= kerSz; j++ )
		{
			color += texture2D( inTex, texCoord + vec2( i / texSz.x, j / texSz.y ) );
		}

	gl_FragColor = color / ( (2*kerSz + 1) * (2*kerSz +1) ) ;
}