ref: 832eb032a1ed49e8704e0178eab312a7aa47bcee
dir: /src/zline.c/
#include <stdlib.h> #include "../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); } }