DOOM-3-BFG/doomclassic/doom/r_main.h

/*
===========================================================================

Doom 3 BFG Edition GPL Source Code
Copyright (C) 1993-2012 id Software LLC, a ZeniMax Media company. 

This file is part of the Doom 3 BFG Edition GPL Source Code ("Doom 3 BFG Edition Source Code").  

Doom 3 BFG Edition Source Code 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 3 of the License, or
(at your option) any later version.

Doom 3 BFG Edition Source Code 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 Doom 3 BFG Edition Source Code.  If not, see <http://www.gnu.org/licenses/>.

In addition, the Doom 3 BFG Edition Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 BFG Edition Source Code.  If not, please request a copy in writing from id Software at the address below.

If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.

===========================================================================
*/

#ifndef __R_MAIN__
#define __R_MAIN__

#include "d_player.h"
#include "r_data.h"


#ifdef __GNUG__
#pragma interface
#endif


//
// POV related.
//
extern fixed_t		viewcos;
extern fixed_t		viewsin;

extern int		viewwidth;
extern int		viewheight;
extern int		viewwindowx;
extern int		viewwindowy;



extern int		centerx;
extern int		centery;

extern fixed_t		centerxfrac;
extern fixed_t		centeryfrac;
extern fixed_t		projection;

extern int		validcount;

extern int		linecount;
extern int		loopcount;


//
// Lighting LUT.
// Used for z-depth cuing per column/row,
//  and other lighting effects (sector ambient, flash).
//

// Lighting constants.
// Now why not 32 levels here?
#define LIGHTLEVELS	        16
#define LIGHTSEGSHIFT	         4

#define MAXLIGHTSCALE		48
#define LIGHTSCALESHIFT		12
#define MAXLIGHTZ	       128
#define LIGHTZSHIFT		20

extern lighttable_t*	scalelight[LIGHTLEVELS][MAXLIGHTSCALE];
extern lighttable_t*	scalelightfixed[MAXLIGHTSCALE];
extern lighttable_t*	zlight[LIGHTLEVELS][MAXLIGHTZ];

extern int		extralight;
extern lighttable_t*	fixedcolormap;


// Number of diminishing brightness levels.
// There a 0-31, i.e. 32 LUT in the COLORMAP lump.
#define NUMCOLORMAPS		32


// Blocky/low detail mode.
//B remove this?
//  0 = high, 1 = low
extern	int		detailshift;	


//
// Function pointers to switch refresh/drawing functions.
// Used to select shadow mode etc.
//
extern void		(*colfunc) ( lighttable_t * ds_colormap,
						byte * ds_source );
extern void		(*basecolfunc) ( lighttable_t * ds_colormap,
						byte * ds_source );
extern void		(*fuzzcolfunc) ( lighttable_t * ds_colormap,
						byte * ds_source );
// No shadow effects on floors.
extern void		(*spanfunc) (
	fixed_t xfrac,
	fixed_t yfrac,
	fixed_t ds_y,
	int ds_x1,
	int ds_x2,
	fixed_t ds_xstep,
	fixed_t ds_ystep,
	lighttable_t * ds_colormap,
	byte * ds_source );


//
// Utility functions.
int
R_PointOnSide
( fixed_t	x,
  fixed_t	y,
  node_t*	node );

int
R_PointOnSegSide
( fixed_t	x,
  fixed_t	y,
  seg_t*	line );

angle_t
R_PointToAngle
( fixed_t	x,
  fixed_t	y );

angle_t
R_PointToAngle2
( fixed_t	x1,
  fixed_t	y1,
  fixed_t	x2,
  fixed_t	y2 );

fixed_t
R_PointToDist
( fixed_t	x,
  fixed_t	y );


fixed_t R_ScaleFromGlobalAngle (angle_t visangle);

subsector_t*
R_PointInSubsector
( fixed_t	x,
  fixed_t	y );

void
R_AddPointToBox
( int		x,
  int		y,
  fixed_t*	box );



//
// REFRESH - the actual rendering functions.
//

// Called by G_Drawer.
void R_RenderPlayerView (player_t *player);

// Called by startup code.
void R_Init (void);

// Called by M_Responder.
void R_SetViewSize (int blocks, int detail);

#endif