1 /* multipass renderer shader 1: RGB: normal */

2

3 uniform sampler2D tex_norm;

4

5 varying vec3 pos, norm, tang;

6

7 void main()

8 {

9 vec3 n = normalize(norm);

10 vec3 t = normalize(tang);

11 vec3 b = cross(n, t);

12

13 mat3 tbn_mat = mat3(

14 t.x, t.y, t.z,

15 b.x, b.y, b.z,

16 n.x, n.y, n.z);

17

18 // grab normal from the normal map, remap it and transform it to view space

19 n = texture2D(tex_norm, gl_TexCoord[0].st).xyz * 2.0 - 1.0;

20 n = normalize(tbn_mat * n);

21

22 gl_FragColor = vec4(n, 0.0);

23 }