1 #include <GL/gl.h>

2 #include "tesquad.h"

3

4 void draw_tess_quad(float x, float y, float w, float h, int usub, int vsub, bool ortho)

5 {

6 if(ortho) {

7 glPushAttrib(GL_ENABLE_BIT);

8 glDisable(GL_DEPTH_TEST);

9 glDisable(GL_LIGHTING);

10

11 glMatrixMode(GL_PROJECTION);

12 glPushMatrix();

13 glLoadIdentity();

14 }

15

16 float du = 1.0 / usub;

17 float dv = 1.0 / vsub;

18

19 float dx = du * w;

20 float dy = dv * h;

21

22 glBegin(GL_QUADS);

23 for (int i=0; i<vsub; i++) {

24 for (int j=0; j<usub; j++) {

25 float u = j * du;

26 float v = 1.0 - i * dv;

27 float sx = x + j * dx;

28 float sy = y + i * dy;

29

30 glTexCoord2f(u, v);

31 glVertex2f(sx, sy);

32 glTexCoord2f(u + du, v);

33 glVertex2f(sx + dx, sy);

34 glTexCoord2f(u + du, v - dv);

35 glVertex2f(sx + dx, sy + dy);

36 glTexCoord2f(u, v - dv);

37 glVertex2f(sx, sy + dy);

38 }

39 }

40 glEnd();

41

42 if(ortho) {

43 glPopMatrix();

44 glPopAttrib();

45 }

46 }