Unity shader学习之屏幕后期处理效果之高斯模糊

 1 using System;
 2 
 3 namespace TestShell
 4 {
 5     class Program
 6     {
 7         static void Main(string[] args)
 8         {
 9             double[,] r = CalcGaussianBlur(5);
10             for (int i = 0; i < r.GetLongLength(0); i++)
11             {
12                 for (int j = 0; j < r.GetLongLength(1); j++)
13                 {
14                     Console.Write("{0:f4}\t", r[i, j]);
15                 }
16                 Console.WriteLine();
17             }
18             Console.ReadKey();
19         }
20 
21         static double[,] CalcGaussianBlur(int size)
22         {
23             double[,] r = new double[size, size];
24             int center = (int)Math.Floor(size / 2f);
25             double sum = 0;
26 
27             for (int i = 0; i < size; i++)
28             {
29                 for (int j = 0; j < size; j++)
30                 {
31                     int x = Math.Abs(i - center);
32                     int y = Math.Abs(j - center);
33                     double d = CalcItem(x, y);
34                     r[i, j] = d;
35                     sum += d;
36                 }
37             }
38 
39             for (int i = 0; i < size; i++)
40             {
41                 for (int j = 0; j < size; j++)
42                 {
43                     r[i, j] /= sum;
44                 }
45             }
46 
47             return r;
48         }
49 
50         static double CalcItem(int x, int y)
51         {
52             return Math.Pow(Math.E, -(x * x + y * y) / 2d);
53         }
54     }
55 }