HDR

 1 #version 330 core
 2 out vec4 FragColor;
 3 
 4 in vec2 TexCoords;
 5 
 6 uniform sampler2D screenTexture;
 7 uniform sampler2D textrue0;
 8 
 9 vec4 expose(vec4 col, float gray, float k)
10 {
11     float a = 4.0 * k - 1.0;
12     float b = 2.0 - 4.0 * k;
13     float result = gray * gray * b + gray * a;    //求取曝光参数
14 
15     return result * col;
16 }
17 
18 void main()
19 {
20     vec4 col = texture(screenTexture, TexCoords);
21     vec4 col2 = texture(textrue0, TexCoords);
22     float gray = 0.3 * col.r + 0.59 * col.g + 0.11 * col.b; //获取亮度值（灰度）
23     FragColor = expose(col2, gray, 1.5);    
24 }