1 #version 330 core
 2
 3 layout(location = 0) in vec3 inPosition;// 顶点位置
 4
 5 uniform mat4 mvpMatrix;
 6
 7 out vec3 texCoord;// 立方体纹理在此顶点处的坐标值
 8
 9 void main()
10 {
11     vec4 position = mvpMatrix * vec4(inPosition, 1.0);
12     gl_Position = position.xyww;// 保证天空盒的深度始终为最深
13     texCoord = inPosition;// 立方体纹理的特殊情况
14 }

 1 #version 330 core
 2
 3 uniform samplerCube skybox;
 4
 5 in vec3 texCoord;
 6
 7 out vec4 color;
 8
 9 void main()
10 {
11     color = texture(skybox, texCoord);
12 }

 1 #version 330 core
 2
 3 layout (location = 0) in vec3 inPosition;
 4 layout (location = 1) in vec3 inNormal;
 5
 6 uniform mat4 projection;
 7 uniform mat4 view;
 8 uniform mat4 model;
 9
10 out vec3 passNormal;
11 out vec3 passPosition;
12
13 void main()
14 {
15     gl_Position = projection * view * model * vec4(inPosition, 1.0);
16
17     passNormal = mat3(transpose(inverse(model))) * inNormal;
18     passPosition = vec3(model * vec4(inPosition, 1.0));
19 }

 1 #version 330 core
 2
 3 uniform vec3 cameraPos;
 4 uniform samplerCube skybox;
 5
 6 in vec3 passNormal;
 7 in vec3 passPosition;
 8
 9 out vec4 FragColor;
10
11 void main()
12 {
13     vec3 I = normalize(passPosition - cameraPos);
14     vec3 R = reflect(I, normalize(passNormal));
15     FragColor = vec4(texture(skybox, R).rgb, 1.0);
16 }

 1 #version 330 core
 2
 3 uniform vec3 cameraPos;
 4 uniform samplerCube skybox;
 5
 6 in vec3 passNormal;
 7 in vec3 passPosition;
 8
 9 out vec4 FragColor;
10
11 void main()
12 {
13     float ratio = 1.00 / 1.52;
14     vec3 I = normalize(passPosition - cameraPos);
15     vec3 R = refract(I, normalize(passNormal), ratio);
16     FragColor = vec4(texture(skybox, R).rgb, 1);
17 }