#ifdef GL_ES

precision mediump float;

#endif

uniform vec4 infiniteRect;

uniform vec4 inputBBox[1];

varying vec4 outputBBox;

uniform float radius;

void main( void )

{

  if(inputBBox[0] == infiniteRect)                    // Better avoid enlarging the infinite 

    outputBBox = infiniteRect;                        // rect...

  else

    outputBBox = vec4(

      inputBBox[0].x - radius,

      inputBBox[0].y - radius,

      inputBBox[0].z + radius,

      inputBBox[0].w + radius);

  gl_Position = vec4(0.0);                            // Does not link without

}