#version 150

uniform sampler2D source[];
uniform vec4 sourceSize[];
uniform vec4 targetSize;

in Vertex { vec2 texCoord; };
out vec4 fragColor;

void main()
{
	vec3 Picture = texture(source[0],texCoord).xyz;

    float Lum = ((0.299*Picture.x) + (0.587*Picture.y) + (0.114*Picture.z));
          Lum = 1-Lum;
          Lum = Lum * 0.5;

    vec3 PictureBlur = texture(source[0],texCoord+sourceSize[0].zw*vec2( Lum, Lum)).xyz;
        PictureBlur += texture(source[0],texCoord+sourceSize[0].zw*vec2(-Lum, Lum)).xyz;
        PictureBlur += texture(source[0],texCoord+sourceSize[0].zw*vec2( Lum,-Lum)).xyz;
        PictureBlur += texture(source[0],texCoord+sourceSize[0].zw*vec2(-Lum,-Lum)).xyz;
        PictureBlur *= 0.25;

    fragColor = vec4(PictureBlur,0);
}