1 #include "m3dimpl.h"

2 #include "lines.h"

3

4

5 void m3d_draw_point(struct min3d_vertex *v)

6 {

7 int x = v->pos[0] + 0.5;

8 int y = v->pos[1] + 0.5;

9 int xsz = m3dctx->cbuf->xsz;

10 m3dctx->cbuf->pixels[y * xsz + x] = v->color;

11 }

12

13 void m3d_draw_line(struct min3d_vertex *v)

14 {

15 int x0, y0, x1, y1;

16

17 x0 = v[0].pos[0];

18 y0 = v[0].pos[1];

19 x1 = v[1].pos[0];

20 y1 = v[1].pos[1];

21

22 if(clip_line2d(&x0, &y0, &x1, &y1, m3dctx->vport)) {

23 draw_line(m3dctx->cbuf->pixels, m3dctx->cbuf->xsz, v->color, x0, y0, x1, y1);

24 }

25 }

26

27 void m3d_draw_poly(struct min3d_vertex *v, int numv)

28 {

29 int i;

30 struct min3d_vertex last[2];

31

32 if(ENABLED(M3D_CULL_FACE)) {

33 float a[2], b[2], crossz = 0;

34

35 for(i=1; i<numv - 1; i++) {

36 int n = i + 1;

37 a[0] = v[i].pos[0] - v[0].pos[0];

38 a[1] = v[i].pos[1] - v[0].pos[1];

39

40 b[0] = v[n].pos[0] - v[0].pos[0];

41 b[1] = v[n].pos[1] - v[0].pos[1];

42

43 crossz += a[0] * b[1] - a[1] * b[0];

44 }

45

46 if(crossz < 0) return;

47 }

48

49 last[0] = v[numv - 1];

50 last[1] = v[0];

51

52 for(i=0; i<numv - 1; i++) {

53 m3d_draw_line(v++);

54 }

55 m3d_draw_line(last);

56 }