1 /*

2 Printblobs - typography display hack

3 Copyright (C) 2013 John Tsiombikas <nuclear@member.fsf.org>

4

5 This program is free software: you can redistribute it and/or modify

6 it under the terms of the GNU General Public License as published by

7 the Free Software Foundation, either version 3 of the License, or

8 (at your option) any later version.

9

10 This program is distributed in the hope that it will be useful,

11 but WITHOUT ANY WARRANTY; without even the implied warranty of

12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

13 GNU General Public License for more details.

14

15 You should have received a copy of the GNU General Public License

16 along with this program. If not, see <http://www.gnu.org/licenses/>.

17 */

18 varying vec3 normal, vpos;

19

20 void main()

21 {

22 vec3 n = normalize(normal);

23 vec3 v = -normalize(vpos);

24

25 vec3 color = vec3(0.0, 0.0, 0.0);

26

27 for(int i=0; i<2; i++) {

28 vec3 l = normalize(gl_LightSource[i].position.xyz);

29 vec3 h = normalize(v + l);

30

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

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

33 float spec = pow(ndoth, gl_FrontMaterial.shininess);

34

35 vec3 dcol = gl_FrontMaterial.diffuse.xyz * gl_LightSource[i].diffuse.xyz;

36 vec3 scol = gl_FrontMaterial.specular.xyz * gl_LightSource[i].diffuse.xyz;

37

38 color += dcol * ndotl + scol * spec;

39 }

40

41 vec3 acol = gl_FrontMaterial.ambient.xyz * gl_LightModel.ambient.xyz;

42

43 gl_FragColor.xyz = acol + color;

44 gl_FragColor.w = 1.0;

45 }