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

WinQuake/d_init.c

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+/*
+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_init.c: rasterization driver initialization
+
+#include "quakedef.h"
+#include "d_local.h"
+
+#define NUM_MIPS	4
+
+cvar_t	d_subdiv16 = {"d_subdiv16", "1"};
+cvar_t	d_mipcap = {"d_mipcap", "0"};
+cvar_t	d_mipscale = {"d_mipscale", "1"};
+
+surfcache_t		*d_initial_rover;
+qboolean		d_roverwrapped;
+int				d_minmip;
+float			d_scalemip[NUM_MIPS-1];
+
+static float	basemip[NUM_MIPS-1] = {1.0, 0.5*0.8, 0.25*0.8};
+
+extern int			d_aflatcolor;
+
+void (*d_drawspans) (espan_t *pspan);
+
+
+/*
+===============
+D_Init
+===============
+*/
+void D_Init (void)
+{
+
+	r_skydirect = 1;
+
+	Cvar_RegisterVariable (&d_subdiv16);
+	Cvar_RegisterVariable (&d_mipcap);
+	Cvar_RegisterVariable (&d_mipscale);
+
+	r_drawpolys = false;
+	r_worldpolysbacktofront = false;
+	r_recursiveaffinetriangles = true;
+	r_pixbytes = 1;
+	r_aliasuvscale = 1.0;
+}
+
+
+/*
+===============
+D_CopyRects
+===============
+*/
+void D_CopyRects (vrect_t *prects, int transparent)
+{
+
+// this function is only required if the CPU doesn't have direct access to the
+// back buffer, and there's some driver interface function that the driver
+// doesn't support and requires Quake to do in software (such as drawing the
+// console); Quake will then draw into wherever the driver points vid.buffer
+// and will call this function before swapping buffers
+
+	UNUSED(prects);
+	UNUSED(transparent);
+}
+
+
+/*
+===============
+D_EnableBackBufferAccess
+===============
+*/
+void D_EnableBackBufferAccess (void)
+{
+	VID_LockBuffer ();
+}
+
+
+/*
+===============
+D_TurnZOn
+===============
+*/
+void D_TurnZOn (void)
+{
+// not needed for software version
+}
+
+
+/*
+===============
+D_DisableBackBufferAccess
+===============
+*/
+void D_DisableBackBufferAccess (void)
+{
+	VID_UnlockBuffer ();
+}
+
+
+/*
+===============
+D_SetupFrame
+===============
+*/
+void D_SetupFrame (void)
+{
+	int		i;
+
+	if (r_dowarp)
+		d_viewbuffer = r_warpbuffer;
+	else
+		d_viewbuffer = (void *)(byte *)vid.buffer;
+
+	if (r_dowarp)
+		screenwidth = WARP_WIDTH;
+	else
+		screenwidth = vid.rowbytes;
+
+	d_roverwrapped = false;
+	d_initial_rover = sc_rover;
+
+	d_minmip = d_mipcap.value;
+	if (d_minmip > 3)
+		d_minmip = 3;
+	else if (d_minmip < 0)
+		d_minmip = 0;
+
+	for (i=0 ; i<(NUM_MIPS-1) ; i++)
+		d_scalemip[i] = basemip[i] * d_mipscale.value;
+
+#if	id386
+				if (d_subdiv16.value)
+					d_drawspans = D_DrawSpans16;
+				else
+					d_drawspans = D_DrawSpans8;
+#else
+				d_drawspans = D_DrawSpans8;
+#endif
+
+	d_aflatcolor = 0;
+}
+
+
+/*
+===============
+D_UpdateRects
+===============
+*/
+void D_UpdateRects (vrect_t *prect)
+{
+
+// the software driver draws these directly to the vid buffer
+
+	UNUSED(prect);
+}
+