普通模糊，动感模糊，高斯模糊算法实现

     模糊算法在实际应用中经常回碰到，这里总结下几种模糊算法，以便将来的需要。

     #ifdef GL_ES
precision mediump float;
#endif
uniform float mode;//0普通模糊 1高斯模糊 2动感模糊
uniform vec2 resolution;
uniform float GlowRange; //模糊半径
uniform float GlowExpand; //动感模糊角度
varying vec4 v_fragmentColor;
varying vec2 v_texCoord;
void main()                     
{   
     vec4 clraverge=vec4(0,0,0,0);                                                                                                                
     if( GlowRange > 0.0 )                                                                                                         
     {  
       if(mode==2)
       {
           float samplerPre =1;