1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
|
#include <stdlib.h>
#include "zbuffer.h"
#define ZCMP(z,zpix) ((z) >= (zpix))
void ZB_plot(ZBuffer * zb, ZBufferPoint * p)
{
unsigned short *pz;
PIXEL *pp;
int zz;
pz = zb->zbuf + (p->y * zb->xsize + p->x);
pp = (PIXEL *) ((char *) zb->pbuf + zb->linesize * p->y + p->x * PSZB);
zz = p->z >> ZB_POINT_Z_FRAC_BITS;
if (ZCMP(zz, *pz)) {
#if TGL_FEATURE_RENDER_BITS == 24
pp[0]=p->r>>8;
pp[1]=p->g>>8;
pp[2]=p->b>>8;
#else
*pp = RGB_TO_PIXEL(p->r, p->g, p->b);
#endif
*pz = zz;
}
}
#define INTERP_Z
static void ZB_line_flat_z(ZBuffer * zb, ZBufferPoint * p1, ZBufferPoint * p2,
int color)
{
#include "zline.h"
}
/* line with color interpolation */
#define INTERP_Z
#define INTERP_RGB
static void ZB_line_interp_z(ZBuffer * zb, ZBufferPoint * p1, ZBufferPoint * p2)
{
#include "zline.h"
}
/* no Z interpolation */
static void ZB_line_flat(ZBuffer * zb, ZBufferPoint * p1, ZBufferPoint * p2,
int color)
{
#include "zline.h"
}
#define INTERP_RGB
static void ZB_line_interp(ZBuffer * zb, ZBufferPoint * p1, ZBufferPoint * p2)
{
#include "zline.h"
}
void ZB_line_z(ZBuffer * zb, ZBufferPoint * p1, ZBufferPoint * p2)
{
int color1, color2;
color1 = RGB_TO_PIXEL(p1->r, p1->g, p1->b);
color2 = RGB_TO_PIXEL(p2->r, p2->g, p2->b);
/* choose if the line should have its color interpolated or not */
if (color1 == color2) {
ZB_line_flat_z(zb, p1, p2, color1);
} else {
ZB_line_interp_z(zb, p1, p2);
}
}
void ZB_line(ZBuffer * zb, ZBufferPoint * p1, ZBufferPoint * p2)
{
int color1, color2;
color1 = RGB_TO_PIXEL(p1->r, p1->g, p1->b);
color2 = RGB_TO_PIXEL(p2->r, p2->g, p2->b);
/* choose if the line should have its color interpolated or not */
if (color1 == color2) {
ZB_line_flat(zb, p1, p2, color1);
} else {
ZB_line_interp(zb, p1, p2);
}
}
|
