1 /* MRT assignments

2 * 0 - RGB: position, A: shininess

3 * 1 - RGB: normal

4 * 2 - RGB: diffuse color, A: shininess str.

5 * 3 - unused

6 */

7

8 uniform sampler2D tex_dif, tex_norm;

9

10 varying vec3 pos, norm, tang;

11

12 const float fog_start = 3.0;

13 const float fog_end = 6.0;

14

15 void main()

16 {

17 vec3 n = normalize(norm);

18 vec3 t = normalize(tang);

19 vec3 b = cross(n, t);

20

21 mat3 tbn_mat = mat3(

22 t.x, t.y, t.z,

23 b.x, b.y, b.z,

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

25

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

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

28 n = normalize(tbn_mat * n);

29

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

31

32 vec4 texel = texture2D(tex_dif, gl_TexCoord[0].st);

33 vec3 diffuse = fog * (gl_FrontMaterial.diffuse * texel).xyz;

34 vec3 spec = fog * gl_FrontMaterial.specular.xyz;

35 float sstr = (spec.x + spec.y + spec.z) / 3.0;

36

37 gl_FragData[0] = vec4(pos, gl_FrontMaterial.shininess);

38 gl_FragData[1] = vec4(n, 0.0);

39 gl_FragData[2] = vec4(diffuse, sstr);

40 //gl_FragData[3] = vec4(0.0, 0.0, 0.0, 0.0);

41 }