1 uniform sampler2D tex_dif, tex_norm;

2

3 varying vec3 pos, norm, tang;

4

5 const float fog_start = 3.0;

6 const float fog_end = 6.0;

7

8 void main()

9 {

10 vec3 texel = texture2D(tex_dif, gl_TexCoord[0].st).xyz;

11

12 vec3 n = normalize(norm);

13 vec3 t = normalize(tang);

14 vec3 b = cross(n, t);

15

16 mat3 tbn_mat = mat3(

17 t.x, b.x, n.x,

18 t.y, b.y, n.y,

19 t.z, b.z, n.z);

20

21

22 const vec3 lpos = vec3(0.0, 0.0, -0.5);

23 vec3 ldir = tbn_mat * normalize(lpos - pos);

24

25 const vec3 vdir = vec3(0.0, 0.0, 1.0);

26 vec3 hvec = normalize(vdir + ldir);

27

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

29 float ndotl = max(dot(n, ldir), 0.0);

30 float ndoth = max(dot(n, hvec), 0.0);

31

32 vec3 diffuse = gl_FrontMaterial.diffuse.xyz * texel * ndotl;

33 vec3 specular = gl_FrontMaterial.specular.xyz * pow(ndoth, gl_FrontMaterial.shininess);

34

35 float fog = clamp((fog_end + pos.z) / (fog_end - fog_start), 0.0, 1.0);

36

37 gl_FragColor = vec4((diffuse + specular) * fog, 1.0);

38 }