/*
 * 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_local.h:  private rasterization driver defs

#include "r_shared.h"

//
// TODO: fine-tune this; it's based on providing some overage even if there
// is a 2k-wide scan, with subdivision every 8, for 256 spans of 12 bytes each
//
#define SCANBUFFERPAD		0x1000

#define R_SKY_SMASK	0x007F0000
#define R_SKY_TMASK	0x007F0000

#define DS_SPAN_LIST_END	-128

#define SURFCACHE_SIZE_AT_320X200	600*1024

typedef struct surfcache_s {
    struct surfcache_s *next;
    struct surfcache_s **owner;        // NULL is an empty chunk of memory
    int           lightadj[MAXLIGHTMAPS];       // checked for strobe flush
    int           dlight;
    int           size;                // including header
    unsigned      width;
    unsigned      height;              // DEBUG only needed for debug
    float         mipscale;
    struct texture_s *texture;         // checked for animating textures
    byte          data[4];             // width*height elements
} surfcache_t;

// !!! if this is changed, it must be changed in asm_draw.h too !!!
typedef struct sspan_s {
    int           u, v, count;
} sspan_t;

extern cvar_t d_subdiv16;

extern float  scale_for_mip;

extern qboolean d_roverwrapped;
extern surfcache_t *sc_rover;
extern surfcache_t *d_initial_rover;

extern float  d_sdivzstepu, d_tdivzstepu, d_zistepu;
extern float  d_sdivzstepv, d_tdivzstepv, d_zistepv;
extern float  d_sdivzorigin, d_tdivzorigin, d_ziorigin;

fixed16_t     sadjust, tadjust;
fixed16_t     bbextents, bbextentt;

void          D_DrawSpans8 (espan_t * pspans);
void          D_DrawSpans16 (espan_t * pspans);
void          D_DrawZSpans (espan_t * pspans);
void          Turbulent8 (espan_t * pspan);
void          D_SpriteDrawSpans (sspan_t * pspan);

void          D_DrawSkyScans8 (espan_t * pspan);
void          D_DrawSkyScans16 (espan_t * pspan);

void          R_ShowSubDiv (void);
void          (*prealspandrawer) (void);
surfcache_t  *D_CacheSurface (msurface_t * surface, int miplevel);

extern int    D_MipLevelForScale (float scale);

#if id386
extern void   D_PolysetAff8Start (void);
extern void   D_PolysetAff8End (void);
#endif

extern short *d_pzbuffer;
extern unsigned int d_zrowbytes, d_zwidth;

extern int   *d_pscantable;
extern int    d_scantable[MAXHEIGHT];

extern int    d_vrectx, d_vrecty, d_vrectright_particle, d_vrectbottom_particle;

extern int    d_y_aspect_shift, d_pix_min, d_pix_max, d_pix_shift;

extern pixel_t *d_viewbuffer;

extern short *zspantable[MAXHEIGHT];

extern int    d_minmip;
extern float  d_scalemip[3];

extern void   (*d_drawspans) (espan_t * pspan);
