85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
#include <stdlib.h>
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#include "zbuffer.h"
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#define ZCMP(z,zpix) ((z) >= (zpix))
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void ZB_plot(ZBuffer * zb, ZBufferPoint * p)
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{
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unsigned short *pz;
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PIXEL *pp;
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int zz;
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pz = zb->zbuf + (p->y * zb->xsize + p->x);
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pp = (PIXEL *) ((char *) zb->pbuf + zb->linesize * p->y + p->x * PSZB);
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zz = p->z >> ZB_POINT_Z_FRAC_BITS;
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if (ZCMP(zz, *pz)) {
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#if TGL_FEATURE_RENDER_BITS == 24
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pp[0]=p->r>>8;
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pp[1]=p->g>>8;
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pp[2]=p->b>>8;
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#else
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*pp = RGB_TO_PIXEL(p->r, p->g, p->b);
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#endif
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*pz = zz;
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}
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}
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#define INTERP_Z
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static void ZB_line_flat_z(ZBuffer * zb, ZBufferPoint * p1, ZBufferPoint * p2,
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int color)
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{
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#include "zline.h"
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}
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/* line with color interpolation */
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#define INTERP_Z
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#define INTERP_RGB
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static void ZB_line_interp_z(ZBuffer * zb, ZBufferPoint * p1, ZBufferPoint * p2)
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{
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#include "zline.h"
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}
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/* no Z interpolation */
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static void ZB_line_flat(ZBuffer * zb, ZBufferPoint * p1, ZBufferPoint * p2,
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int color)
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{
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#include "zline.h"
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}
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#define INTERP_RGB
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static void ZB_line_interp(ZBuffer * zb, ZBufferPoint * p1, ZBufferPoint * p2)
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{
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#include "zline.h"
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}
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void ZB_line_z(ZBuffer * zb, ZBufferPoint * p1, ZBufferPoint * p2)
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{
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int color1, color2;
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color1 = RGB_TO_PIXEL(p1->r, p1->g, p1->b);
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color2 = RGB_TO_PIXEL(p2->r, p2->g, p2->b);
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/* choose if the line should have its color interpolated or not */
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if (color1 == color2) {
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ZB_line_flat_z(zb, p1, p2, color1);
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} else {
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ZB_line_interp_z(zb, p1, p2);
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}
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}
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void ZB_line(ZBuffer * zb, ZBufferPoint * p1, ZBufferPoint * p2)
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{
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int color1, color2;
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color1 = RGB_TO_PIXEL(p1->r, p1->g, p1->b);
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color2 = RGB_TO_PIXEL(p2->r, p2->g, p2->b);
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/* choose if the line should have its color interpolated or not */
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if (color1 == color2) {
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ZB_line_flat(zb, p1, p2, color1);
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} else {
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ZB_line_interp(zb, p1, p2);
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}
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}
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