source: data/branches/Shader_HS18/programs/GLSL120/BlurH_ps20.glsl

//-------------------------------
//BlurH_ps20.glsl
// Horizontal Gaussian-Blur pass
//-------------------------------
#version 120

uniform sampler2D Blur0;
varying vec2 texCoord;

vec2 pos[11] = vec2[11]
(
        vec2( -5, 0),
        vec2( -4, 0),
        vec2( -3, 0),
        vec2( -2, 0),
        vec2( -1, 0),
        vec2( 0, 0),
        vec2( 1, 0),
        vec2( 2, 0),
        vec2( 3, 0),
        vec2( 4, 0),
        vec2( 5, 0)
);

//We use the Normal-gauss distribution formula
//f(x) being the formula, we used f(0.5)-f(-0.5); f(1.5)-f(0.5)...
float samples[11] = float[11]
(//stddev=2.0
0.01222447,
0.02783468,
0.06559061,
0.12097757,
0.17466632,

0.19741265,

0.17466632,
0.12097757,
0.06559061,
0.02783468,
0.01222447
);

void main()
{
    vec4 retVal;
    vec4 sum;
    int i = 0;

    sum = vec4( 0 );
    for( i=0;i < 11; i++ )
    {
        sum += texture2D( Blur0, texCoord + (pos[i] * 0.0100000) ) * samples[i];
    }

    gl_FragColor = sum;
}