#version 330 core

uniform sampler2D sceneTex;

uniform int isVertical;

in Vertex {
 vec2 texCoord;
} IN;

out vec4 fragColor;

const float scaleFactors [7] =
	float [](0.006 , 0.061 , 0.242 , 0.383 , 0.242 , 0.061 , 0.006);

void main ( void ) {
	fragColor = vec4 (0 ,0 ,0 ,1);

	vec2 delta = vec2 (0 ,0);

	if( isVertical == 1) {
		delta = dFdy ( IN.texCoord );
	}
	else {
		delta = dFdx ( IN.texCoord );
	}
 
	for (int i = 0; i < 7; i ++ ) {
		vec2 offset = delta * ( i - 3);
		vec4 tmp = texture ( sceneTex , IN.texCoord. xy + offset );
		fragColor += tmp * scaleFactors [i];
	}
}