/*
	d_modech.c

	called when mode has just changed

	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 "QF/render.h"
#include "QF/sys.h"

#include "r_internal.h"
#include "d_local.h"

int         d_vrectx, d_vrecty, d_vrectright_particle, d_vrectbottom_particle;

int         d_y_aspect_shift, d_pix_min, d_pix_max, d_pix_shift;

int         d_scantable[MAXHEIGHT];
short      *zspantable[MAXHEIGHT];


static void
D_Patch (void)
{
#ifdef PIC
#undef USE_INTEL_ASM //XXX asm pic hack
#endif

#ifdef USE_INTEL_ASM

	static qboolean protectset8 = false;

	if (!protectset8) {
		Sys_MakeCodeWriteable ((int) D_PolysetAff8Start,
							   (int) D_PolysetAff8End -
							   (int) D_PolysetAff8Start);
		protectset8 = true;
	}
#endif // USE_INTEL_ASM
}

void
D_ViewChanged (void)
{
	int         rowpixels;

	if (r_dowarp)
		rowpixels = WARP_WIDTH;
	else
		rowpixels = vid.rowbytes;

	scale_for_mip = xscale;
	if (yscale > xscale)
		scale_for_mip = yscale;

	d_zrowbytes = vid.width * 2;
	d_zwidth = vid.width;

	d_pix_min = r_refdef.vrect.width / 320;
	if (d_pix_min < 1)
		d_pix_min = 1;

	d_pix_max = (int) ((float) r_refdef.vrect.width / (320.0 / 4.0) + 0.5);
	d_pix_shift = 8 - (int) ((float) r_refdef.vrect.width / 320.0 + 0.5);
	if (d_pix_max < 1)
		d_pix_max = 1;

	if (pixelAspect > 1.4)
		d_y_aspect_shift = 1;
	else
		d_y_aspect_shift = 0;

	d_vrectx = r_refdef.vrect.x;
	d_vrecty = r_refdef.vrect.y;
	d_vrectright_particle = r_refdef.vrectright - d_pix_max;
	d_vrectbottom_particle =
		r_refdef.vrectbottom - (d_pix_max << d_y_aspect_shift);

	{
		unsigned    i;

		for (i = 0; i < vid.height; i++) {
			d_scantable[i] = i * rowpixels;
			zspantable[i] = d_pzbuffer + i * d_zwidth;
		}
	}

	D_Patch ();
}