普通模糊，動感模糊，高斯模糊演算法實現
模糊演算法在實際應用中經常回碰到，這裡總結下幾種模糊演算法，以便將來的需要。
#ifdef GL_ES
precision mediump float;
#endif
uniform float mode;//0普通模糊 1高斯模糊 2動感模糊
uniform vec2 resolution;
uniform float GlowRange; //模糊半徑
uniform float GlowExpand; //動感模糊角度
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;
float range=GlowRange*3;
float rad=GlowExpand;
for( float j = 1; j<=range ; j += samplerPre )
{
float dx=0.002*cos(rad);
float dy=0.002*sin(rad);
vec2 samplerTexCoord = vec2( v_texCoord.x + j*dx, v_texCoord.y+j*dy );
vec2 samplerTexCoord1= vec2( v_texCoord.x - j*dx,v_texCoord.y-j*dy);
if( samplerTexCoord.x < 0.0 || samplerTexCoord.x > 1.0 ||samplerTexCoord1.x < 0.0 || samplerTexCoord1.x > 1.0||
samplerTexCoord.y < 0.0 || samplerTexCoord.y > 1.0 ||samplerTexCoord1.y < 0.0 || samplerTexCoord1.y > 1.0)
{
continue;
}
vec4 tc= texture2D( CC_Texture0, samplerTexCoord );
vec4 tc1= texture2D( CC_Texture0, samplerTexCoord1 );
clraverge+=tc;
clraverge+=tc1;
}
clraverge/=(range*2);
}
else{
float samplerPre = 3.0;
float radiusX = 1.0 / TextureSize.x;
float radiusY = 1.0 / TextureSize.y;
float count = 0.0;
float range=GlowRange*2.0;
for( float i = -range ; i <= range ; i += samplerPre )
{
for( float j = -range ; j <= range ; j += samplerPre )
{
float nx=j;
float ny=i;
float q=range/1.75;
float gr=(1.0/(2*3.14159*q*q))*exp(-(nx*nx+ny*ny)/(2*q*q))*9.0;
vec2 samplerTexCoord = vec2( v_texCoord.x + j * radiusX , v_texCoord.y + i * radiusY );
if( samplerTexCoord.x < 0.0)
samplerTexCoord.x=-samplerTexCoord.x;
else if(samplerTexCoord.x > 1.0)
samplerTexCoord.x =2-samplerTexCoord.x;
if(samplerTexCoord.y < 0.0)
samplerTexCoord.y=-samplerTexCoord.y;
else if(samplerTexCoord.y > 1.0)
samplerTexCoord.y =2-samplerTexCoord.y;
vec4 tc= texture2D( CC_Texture0, samplerTexCoord );
if(mode==0)
clraverge+=tc;
else if(mode==1)
clraverge+=tc*gr;
count+=1;
}
}
if(mode==0)
clraverge/=count;
}
}
gl_FragColor =clraverge;
}
普通模糊就是取附近一定範圍的顏色平均值，高斯模糊是取加權平均值，動感模糊就是將一條直線的附近顏色取平均值，glsl程式碼在上面已經貼出，實際應用只要設定相應引數就ok了
原圖：
普通模糊：
高斯模糊:
動感模糊：
