- xstep = (((COS(vox->angle) >> 4) * len) >> 4) / FBWIDTH;
- ystep = (((SIN(vox->angle) >> 4) * len) >> 4) / FBWIDTH;
-
- x = vox->x - SIN(vox->angle) * z - xstep * (FBWIDTH / 2);
- y = vox->y + COS(vox->angle) * z - ystep * (FBWIDTH / 2);
-
- for(i=1; i<FBWIDTH / 2; i++) {
- col = i * 2;
- offs = (((y >> 16) & YMASK) << XSHIFT) + ((x >> 16) & XMASK);
- if(offs == last_offs) {
- hval = last_hval;
- color = last_col;
- } else {
- hval = vox->height[offs] - vox->vheight;
- hval = hval * HSCALE / (vox->znear + n) + vox->horizon;
- if(hval > FBHEIGHT) hval = FBHEIGHT;
- color = vox->color[offs];
- last_offs = offs;
- last_hval = hval;
- last_col = color;
- }
- if(hval > vox->coltop[col]) {
- colstart = FBHEIGHT - hval;
- colheight = hval - vox->coltop[col];
- fbptr = vox->fb + colstart * (FBWIDTH / 2) + i;
+ xstep = (((COS(vox->angle) >> 4) * len) >> 4) / (FBWIDTH / 2);
+ ystep = (((SIN(vox->angle) >> 4) * len) >> 4) / (FBWIDTH / 2);