高斯模糊

 1 #version 330 core
 2 out vec4 FragColor;
 3 
 4 in vec2 TexCoords;
 5 
 6 uniform sampler2D texture1;
 7 uniform float gauss[21];
 8 
 9 const vec2 texSize = vec2(1000, 800);
10   
11 void main()
12 {               
13     float xStep, yStep;
14     xStep = 1.0 / 1000.0;
15     vec4 color = vec4(0.0);
16     //X方向
17     for(int i = 1; i < 21; i++)
18     {
19         if(TexCoords.x - xStep * i > 0.0)
20         {
21             color += (texture(texture1, vec2(TexCoords.x - xStep * i, TexCoords.y)) * gauss[i]) ;
22         }
23 
24         if(TexCoords.x + xStep * i < 1.0)
25         {
26             color += (texture(texture1, vec2(TexCoords.x + xStep * i, TexCoords.y)) * gauss[i]);
27         }
28     }
29    FragColor = color;
30 }

 1 float g_GaussNum[21];
 2 float gauss(int x)
 3 {
 4     float pi = 3.1415927f;
 5     float e = 2.71828f;
 6     float theta = 0.1f;
 7     float theta2 = theta * theta;
 8     float temp1 = 1.0f / (theta * sqrt(2 * pi));
 9     float temp2 = pow(e, -(x * x) / 2 * theta2);
10     return temp1 * temp2;
11 }
12 
13 void calculateGauss()
14 {
15     g_GaussNum[0] = 1.0f;
16 
17     for (int i = 1; i < sizeof(g_GaussNum) / sizeof(g_GaussNum[0]); i++) {
18         g_GaussNum[i] = gauss(i);
19     }
20 
21     float total = 0.0f;
22     for (int i = 0; i < sizeof(g_GaussNum) / sizeof(g_GaussNum[0]); i++) {
23         total += g_GaussNum[i];
24     }
25 
26     for (int i = 0; i < sizeof(g_GaussNum) / sizeof(g_GaussNum[0]); i++) {
27         g_GaussNum[i] = g_GaussNum[i] / total;
28     }
29 }