blurx.frag

 #version 330
uniform sampler2D u_tex;
uniform float u_tex_w;
uniform float u_tex_h;
in vec2 v_tex;
layout( location = 0 ) out vec4 fragcolor;

void main() {
  float sy = (1.0 / u_tex_h);
  float sx = (1.0 / u_tex_w);
  fragcolor = texture(u_tex, v_tex) * 0.186315;
  fragcolor += texture(u_tex, vec2(v_tex.s + (1.42556 * sx), v_tex.t)) * 0.293476;
  fragcolor += texture(u_tex, vec2(v_tex.s - (1.42556 * sx), v_tex.t)) * 0.293476;
  fragcolor += texture(u_tex, vec2(v_tex.s + (3.33181 * sx), v_tex.t)) * 0.113367;
  fragcolor += texture(u_tex, vec2(v_tex.s - (3.33181 * sx), v_tex.t)) * 0.113367;
}