1 #version 410 compatibility

2

3 uniform int tess_level;

4

5 in vec3 normal;

6 in vec3 vpos;

7 in vec2 uv;

8

9

10 void main()

11 {

12 vec3 ldir = gl_LightSource[0].position.xyz - vpos;

13

14 vec3 n = normalize(normal);

15 vec3 v = -normalize(vpos);

16 vec3 l = normalize(ldir);

17 vec3 h = normalize(l + v);

18

19 float ndotl = max(dot(n, l), 0.0);

20 float ndoth = max(dot(n, h), 0.0);

21

22 vec3 ka = gl_FrontMaterial.ambient.xyz;

23 vec3 kd = gl_FrontMaterial.diffuse.xyz;

24 vec3 ks = gl_FrontMaterial.specular.xyz;

25 float shin = gl_FrontMaterial.shininess;

26

27 vec3 diffuse = kd * ndotl * gl_LightSource[0].diffuse.xyz;

28 vec3 specular = ks * pow(ndoth, shin) * gl_LightSource[0].specular.xyz;

29 vec3 ambient = ka * gl_LightModel.ambient.xyz;

30 vec3 color = ambient + diffuse + specular;

31

32 vec2 tess_uv = mod(uv * float(tess_level), 1.0);

33

34 #define STEPSZ 0.1

35 float wire = smoothstep(0.0, STEPSZ, tess_uv.x) * smoothstep(1.0, 1.0 - STEPSZ, tess_uv.x);

36 wire *= smoothstep(0.0, STEPSZ, tess_uv.y) * smoothstep(1.0, 1.0 - STEPSZ, tess_uv.y);

37

38 gl_FragColor = vec4(mix(vec3(0.0, 0.0, 0.0), color, wire), gl_FrontMaterial.diffuse.w);

39 }