Gaussian Blur-GLSL

/* @desc: Horizontal Blur */
#version 130
uniform int g_iViewPortSize;
uniform float g_fDistribRange;
uniform sampler2D g_SourceMap;

in vec2 g_vec2FragTexCoord;

out vec4 g_vec3FragColor;

// @desc: The entry of fragment shader.
void main(void)
{
   #define SAMPLER_NUMBER 13
   vec2 arySamplerDistribution[SAMPLER_NUMBER] = vec2[SAMPLER_NUMBER]
   (
      vec2(-6.0f, 0.0f), vec2(-5.0f, 0.0f), vec2(-4.0f, 0.0f), 
      vec2(-3.0f, 0.0f), vec2(-2.0f, 0.0f), vec2(-1.0f, 0.0f), 
      vec2( 0.0f, 0.0f),
      vec2( 6.0f, 0.0f), vec2( 5.0f, 0.0f), vec2( 4.0f, 0.0f), 
      vec2( 3.0f, 0.0f), vec2( 2.0f, 0.0f), vec2( 1.0f, 0.0f)
      
   );
   float arySamplerWeight[SAMPLER_NUMBER] = float[SAMPLER_NUMBER]
   (   
      0.002216f, 0.008764f, 0.026995f, 0.064759f, 0.120985f, 0.176033f,
      0.199471f,
      0.176033f, 0.120985f, 0.064759f, 0.026995f, 0.008764f, 0.002216f
   );
   vec4 vec4Result = vec4(0.0f);
   for (int i = 0; i < SAMPLER_NUMBER; ++i)
   {
      vec4Result += texture2D(g_SourceMap, g_vec2FragTexCoord + arySamplerDistribution[i]/g_iViewPortSize*g_fDistribRange)*arySamplerWeight[i];
   }
   g_vec3FragColor = vec4Result;
}

/* @desc: Vertical Blur */
#version 130
uniform int g_iViewPortSize;
uniform float g_fDistribRange;
uniform sampler2D g_SourceMap;

in vec2 g_vec2FragTexCoord;

out vec4 g_vec3FragColor;

// @desc: The entry of fragment shader.
void main(void)
{
   #define SAMPLER_NUMBER 13
   vec2 arySamplerDistribution[SAMPLER_NUMBER] = vec2[SAMPLER_NUMBER]
   (
      vec2(0.0f, -6.0f), vec2(0.0f, -5.0f), vec2(0.0f, -4.0f), 
      vec2(0.0f, -3.0f), vec2(0.0f, -2.0f), vec2(0.0f, -1.0f), 
      vec2(0.0f,  0.0f),
      vec2(0.0f,  6.0f), vec2(0.0f,  5.0f), vec2(0.0f,  4.0f), 
      vec2(0.0f,  3.0f), vec2(0.0f,  2.0f), vec2(0.0f,  1.0f)
      
   );
   float arySamplerWeight[SAMPLER_NUMBER] = float[SAMPLER_NUMBER]
   (   
      0.002216f, 0.008764f, 0.026995f, 0.064759f, 0.120985f, 0.176033f,
      0.199471f,
      0.176033f, 0.120985f, 0.064759f, 0.026995f, 0.008764f, 0.002216f
   );
   vec4 vec4Result = vec4(0.0f);
   for (int i = 0; i < SAMPLER_NUMBER; ++i)
   {
      vec4Result += texture2D(g_SourceMap, g_vec2FragTexCoord + arySamplerDistribution[i]/g_iViewPortSize*g_fDistribRange)*arySamplerWeight[i];
   }
   g_vec3FragColor = vec4Result;
}

 

图1: 未模糊

图2: 已模糊