/*
	d_init.c

	rasterization driver initialization

	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

	$Id: d_init.c,v 1.1.1.1 2001/03/06 09:33:10 lordhavoc Exp $
*/

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

#include "bothdefs.h"
#include "d_local.h"

#define NUM_MIPS	4

cvar_t     *d_mipcap;
cvar_t     *d_mipscale;

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;

float d_zitable[65536];

/*
	D_Init
*/
void
D_Init (void)
{
	r_skydirect = 1;

	r_drawpolys = false;
	r_worldpolysbacktofront = false;
	r_aliasuvscale = 1.0;

	// LordHavoc: compute 1/zi table for use in rendering code everywhere
	if (!d_zitable[1])
	{
		int i;
		d_zitable[0] = 0;
		for (i = 1;i < 65536;i++)
			d_zitable[i] = (65536.0 * 65536.0 / (double) i);
	}
}

void
D_Init_Cvars (void)
{
	d_mipcap = Cvar_Get ("d_mipcap", "0", CVAR_NONE, "Detail level. 0 is highest, 3 is lowest.");
	d_mipscale = Cvar_Get ("d_mipscale", "1", CVAR_NONE, "Detail level of objects. 0 is highest, 3 is lowest.");
}

/*
	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 = (void *) r_warpbuffer;
	else
		d_viewbuffer = (void *) vid.buffer;

	if (r_dowarp)
		screenwidth = WARP_WIDTH;
	else
		screenwidth = vid.rowbytes / r_pixbytes;

	d_roverwrapped = false;
	d_initial_rover = sc_rover;

	d_minmip = bound (0, d_mipcap->value, 3);

	for (i = 0; i < (NUM_MIPS - 1); i++)
		d_scalemip[i] = basemip[i] * d_mipscale->value;

	d_aflatcolor = 0;
}


/*
	D_UpdateRects
*/
void
D_UpdateRects (vrect_t *prect)
{

// the software driver draws these directly to the vid buffer

	UNUSED (prect);
}