quakeforge/libs/video/renderer/sw/d_zpoint.c

/*
	d_zpoint.c

	software driver module for drawing z-buffered points

	Copyright (C) 1996-1997  Id Software, Inc.

	This program is free software; you can redistribute it and/or
	modify it under the terms of the GNU General Public License
	as published by the Free Software Foundation; either version 2
	of the License, or (at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

	See the GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to:

		Free Software Foundation, Inc.
		59 Temple Place - Suite 330
		Boston, MA  02111-1307, USA

*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include "d_local.h"
#include "r_internal.h"
#include "vid_internal.h"
#include "vid_sw.h"


void
draw_z_point_8 (void)
{
	byte       *pdest;
	short      *pz;
	int         izi;

	pz = d_pzbuffer + (d_zwidth * r_zpointdesc.v) + r_zpointdesc.u;
	pdest = d_viewbuffer + d_scantable[r_zpointdesc.v] + r_zpointdesc.u;
	izi = (int) (r_zpointdesc.zi * 0x8000);

	if (*pz <= izi) {
		*pz = izi;
		*pdest = r_zpointdesc.color;
	}
}

void
draw_z_point_16 (void)
{
	short      *pz;
	int         izi;

	pz = d_pzbuffer + (d_zwidth * r_zpointdesc.v) + r_zpointdesc.u;
	izi = (int) (r_zpointdesc.zi * 0x8000);

	if (*pz <= izi) {
		*pz = izi;
		((short *) d_viewbuffer) [d_scantable[r_zpointdesc.v]
			+ r_zpointdesc.u] = d_8to16table[r_zpointdesc.color];
	}
}

void
draw_z_point_32 (void)
{
	short      *pz;
	int         izi;

	pz = d_pzbuffer + (d_zwidth * r_zpointdesc.v) + r_zpointdesc.u;
	izi = (int) (r_zpointdesc.zi * 0x8000);

	if (*pz <= izi) {
		*pz = izi;
		((int *) d_viewbuffer) [d_scantable[r_zpointdesc.v]
			+ r_zpointdesc.u] = d_8to24table[r_zpointdesc.color];
	}
}