forked from KolibriOS/kolibrios
85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
#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);
|
|
}
|
|
}
|