#ifdef GL_ES
#define LOWP lowp
    precision mediump float;
#else
    #define LOWP
#endif
varying LOWP vec4 vColor;
varying vec2 vTexCoord;

uniform sampler2D u_texture;
uniform float resolution;
uniform float radius;
uniform vec2 dir;

void main() {

	vec4 sum = vec4(0.0);
	vec2 tc = vTexCoord;
	float blur = radius/resolution;

	float hstep = dir.x;
	float vstep = dir.y;

	sum += texture2D(u_texture, vec2(tc.x - 4.0*blur*hstep, tc.y - 4.0*blur*vstep)) * 0.05;
	sum += texture2D(u_texture, vec2(tc.x - 3.0*blur*hstep, tc.y - 3.0*blur*vstep)) * 0.09;
	sum += texture2D(u_texture, vec2(tc.x - 2.0*blur*hstep, tc.y - 2.0*blur*vstep)) * 0.12;
	sum += texture2D(u_texture, vec2(tc.x - 1.0*blur*hstep, tc.y - 1.0*blur*vstep)) * 0.15;

	sum += texture2D(u_texture, vec2(tc.x, tc.y)) * 0.16;

	sum += texture2D(u_texture, vec2(tc.x + 1.0*blur*hstep, tc.y + 1.0*blur*vstep)) * 0.15;
	sum += texture2D(u_texture, vec2(tc.x + 2.0*blur*hstep, tc.y + 2.0*blur*vstep)) * 0.12;
	sum += texture2D(u_texture, vec2(tc.x + 3.0*blur*hstep, tc.y + 3.0*blur*vstep)) * 0.09;
	sum += texture2D(u_texture, vec2(tc.x + 4.0*blur*hstep, tc.y + 4.0*blur*vstep)) * 0.05;

	gl_FragColor = vColor * vec4(sum.rgb, 1.0);
}