/*
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"
#ifndef _D_LOCAL_H_
#define _D_LOCAL_H_
#endif

//
// 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;

#ifndef _R_LOCAL_H_
extern fixed16_t sadjust, tadjust;
extern fixed16_t bbextents, bbextentt;
#endif


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);
/* never used??? 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);