/*
THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
SOFTWARE CORPORATION ("PARALLAX").  PARALLAX, IN DISTRIBUTING THE CODE TO
END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
IN USING, DISPLAYING,  AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
FREE PURPOSES.  IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES.  THE END-USER UNDERSTANDS
AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.  
COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION.  ALL RIGHTS RESERVED.
*/
/*
 * $Source: /cvs/cvsroot/d2x/3d/setup.c,v $
 * $Revision: 1.1.1.1 $
 * $Author: bradleyb $
 * $Date: 2001-01-19 03:29:58 $
 * 
 * Setup for 3d library
 * 
 * $Log: not supported by cvs2svn $
 * Revision 1.3  1999/10/07 02:27:14  donut
 * OGL includes to remove warnings
 *
 * Revision 1.2  1999/09/21 04:05:55  donut
 * mostly complete OGL implementation (still needs bitmap handling (reticle), and door/fan textures are corrupt)
 *
 * Revision 1.1.1.1  1999/06/14 21:57:50  donut
 * Import of d1x 1.37 source.
 *
 * Revision 1.4  1995/10/11  00:27:04  allender
 * bash free_num_points to 0
 *
 * Revision 1.3  1995/09/13  11:31:58  allender
 * calc for fCanv_w2 and fCanv_h2
 *
 * Revision 1.2  1995/06/25  21:57:57  allender
 * *** empty log message ***
 *
 * Revision 1.1  1995/05/05  08:52:54  allender
 * Initial revision
 *
 * Revision 1.1  1995/04/17  03:59:01  matt
 * Initial revision
 * 
 * 
 */


#ifdef RCS
static char rcsid[] = "$Id: setup.c,v 1.1.1.1 2001-01-19 03:29:58 bradleyb Exp $";
#endif

#include <conf.h>
#include <stdlib.h>

#include "error.h"

#include "fix.h"
#include "vecmat.h"
#include "gr.h"
#include "3d.h"
#include "globvars.h"
#include "clipper.h"

#ifdef OGL
#include "ogl_init.h"
#endif

//initialize the 3d system
void g3_init(void)
{
//	div0_init(DM_ERROR);
	atexit(g3_close);
}

//close down the 3d system
void g3_close(void) {}

extern void init_interface_vars_to_assembler(void);

//start the frame
void g3_start_frame(void)
{
	fix s;

	//set int w,h & fixed-point w,h/2
	Canv_w2 = (Canvas_width  = grd_curcanv->cv_bitmap.bm_w)<<15;
	Canv_h2 = (Canvas_height = grd_curcanv->cv_bitmap.bm_h)<<15;
#ifdef __powerc
	fCanv_w2 = f2fl((Canvas_width  = grd_curcanv->cv_bitmap.bm_w)<<15);
	fCanv_h2 = f2fl((Canvas_height = grd_curcanv->cv_bitmap.bm_h)<<15);
#endif

	//compute aspect ratio for this canvas

	s = fixmuldiv(grd_curscreen->sc_aspect,Canvas_height,Canvas_width);

	if (s <= f1_0) {	   //scale x
		Window_scale.x = s;
		Window_scale.y = f1_0;
	}
	else {
		Window_scale.y = fixdiv(f1_0,s);
		Window_scale.x = f1_0;
	}
	
	Window_scale.z = f1_0;		//always 1

	init_free_points();

#ifdef D1XD3D
	Win32_start_frame ();
#else
#ifdef OGL
	ogl_start_frame();
#else
	init_interface_vars_to_assembler();		//for the texture-mapper
#endif
#endif

}

//this doesn't do anything, but is here for completeness
void g3_end_frame(void)
{
#ifdef D1XD3D
	Win32_end_frame ();
#endif
#ifdef OGL
	ogl_end_frame();
#endif

//	Assert(free_point_num==0);
	free_point_num = 0;

}