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/*
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);

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