The Quake sources as originally release under the GPL license on December 21, 1999

WinQuake/d_zpoint.c

@@ -0,0 +1,47 @@
+/*
+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 the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+*/
+// d_zpoint.c: software driver module for drawing z-buffered points
+
+#include "quakedef.h"
+#include "d_local.h"
+
+
+/*
+=====================
+D_DrawZPoint
+=====================
+*/
+void D_DrawZPoint (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;
+	}
+}
+