uniform sampler2D background_tex;
uniform sampler2D noise_tex;
varying vec2      tex_coord;
varying vec2      tex_coord2;

void main()
{
  vec4 uv_col  = texture2D(noise_tex, tex_coord2.xy);
  vec4 uv_col2  = texture2D(noise_tex, tex_coord2.xy + vec2(0.3, 0.3));

  //  vec2 pos = tex_coord.xy;
  vec2 pos = tex_coord.xy + ((uv_col.rg-0.5) * (uv_col.b*.05));
 vec2 pos2 = pos + vec2(0.3, 0.3);
    vec4 tex_col;
    vec4 tex_col2;

  // blur
    for(int i = -2; i <= 2; ++i) {
      tex_col += texture2D(background_tex, pos.xy + vec2(0, i*(1/128.0)));
      tex_col += texture2D(background_tex, pos.xy + vec2(i*(1/128.0), 0));
    }
    tex_col *= 1.0/5.0;

float r = -tex_coord.y;
  tex_col = mix(tex_col, vec4(r, r*0.5, 0, 1), r);

    tex_col2= texture2D(background_tex, pos.xy);


//  vec4 uv_col  = vec4(tex_coord.x, tex_coord.y, 0, 1);
    gl_FragColor = mix(tex_col, tex_col2, clamp(pow(uv_col2.b*2, 1.5)/2.0, 0, 1.0));

//  gl_FragColor = (tex_col + uv_col) * 0.5;
}