#ifdef GL_ES
#ifdef GL_FRAGMENT_PRECISION_HIGH
precision highp float;
#else
precision mediump float;
#endif
#endif
uniform sampler2D tex;
varying vec2 tex_c;
varying vec2 tex_s[4];
varying vec4 div_s;
void main()
{
   vec4 col00 = texture2D(tex, tex_c + tex_s[0]);
   vec4 col01 = texture2D(tex, tex_c + tex_s[1]);
   vec4 col10 = texture2D(tex, tex_c + tex_s[2]);
   vec4 col11 = texture2D(tex, tex_c + tex_s[3]);
   vec4 c = (col00 + col01 + col10 + col11) / div_s;
   gl_FragColor = vec4(c.r, c.g, c.b, 1);
}