径向模糊

 1 #version 330 core
 2 out vec4 FragColor;
 3 in vec2 TexCoords;
 4 uniform sampler2D screenTexture;
 5 
 6 void main()
 7 {
 8     vec2 uv = TexCoords;
 9     vec4 clraverge = vec4(0, 0, 0, 0);
10     float range = 10.0;
11     float count = 0;
12     vec2 cpos = vec2(0.5, 0.5);
13     float x1, y1;
14     for (float j = 1; j <= range; j++)
15     {
16         if (cpos.x - uv.x == 0)
17         {
18             x1 = uv.x;
19             y1 = uv.y + (cpos.y - uv.y) * j / (10 * range);
20         }
21         else
22         {
23             float k = (cpos.y - uv.y) / (cpos.x - uv.x);
24             x1 = uv.x + (cpos.x - uv.x) * j / (10.0 * range);
25             y1 = cpos.y - (cpos.x - x1) * k;
26 
27             if (x1 < 0.0 || y1 < 0.0 || x1 > 1.0 || y1 > 1.0)
28             {
29                 continue;
30             }
31         }
32         clraverge += texture(screenTexture, vec2(x1, y1));
33         count += 1;
34     } 
35     clraverge /= count;
36 
37     FragColor = clraverge;
38 }