/* Emacs style mode select   -*- C++ -*-
 *-----------------------------------------------------------------------------
 *
 *
 *  PrBoom a Doom port merged with LxDoom and LSDLDoom
 *  based on BOOM, a modified and improved DOOM engine
 *  Copyright (C) 1999 by
 *  id Software, Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman
 *  Copyright (C) 1999-2000 by
 *  Jess Haas, Nicolas Kalkhof, Colin Phipps, Florian Schulze
 *
 *  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.
 *
 * DESCRIPTION:
 *      Refresh/rendering module, shared data struct definitions.
 *
 *-----------------------------------------------------------------------------*/

#ifndef __R_DEFS__
#define __R_DEFS__

// Screenwidth.
#include "doomdef.h"

// Some more or less basic data types
// we depend on.
#include "m_fixed.h"

// We rely on the thinker data struct
// to handle sound origins in sectors.
#include "d_think.h"
// SECTORS do store MObjs anyway.
#include "p_mobj.h"

#ifdef __GNUG__
#pragma interface
#endif

// Silhouette, needed for clipping Segs (mainly)
// and sprites representing things.
#define SIL_NONE  0
#define SIL_BOTTOM  1
#define SIL_TOP   2
#define SIL_BOTH  3

#define MAXDRAWSEGS  256

//
// INTERNAL MAP TYPES
//  used by play and refresh
//

//
// Your plain vanilla vertex.
// Note: transformed values not buffered locally,
// like some DOOM-alikes ("wt", "WebView") do.
//
typedef struct
{
   fixed_t x, y;
}
vertex_t;

// Each sector has a degenmobj_t in its center for sound origin purposes.
typedef struct
{
   thinker_t thinker;  // not used for anything
   fixed_t x, y, z;
}
degenmobj_t;

//
// The SECTORS record, at runtime.
// Stores things/mobjs.
//

typedef struct
{
   fixed_t floorheight;
   fixed_t ceilingheight;
   int nexttag,firsttag;  // killough 1/30/98: improves searches for tags.
   int soundtraversed;    // 0 = untraversed, 1,2 = sndlines-1
   mobj_t *soundtarget;   // thing that made a sound (or null)
   int blockbox[4];       // mapblock bounding box for height changes
   degenmobj_t soundorg;  // origin for any sounds played by the sector
   int validcount;        // if == validcount, already checked
   mobj_t *thinglist;     // list of mobjs in sector

   /* killough 8/28/98: friction is a sector property, not an mobj property.
    * these fields used to be in mobj_t, but presented performance problems
    * when processed as mobj properties. Fix is to make them sector properties.
    */
   int friction,movefactor;

   // thinker_t for reversable actions
   void *floordata;    // jff 2/22/98 make thinkers on
   void *ceilingdata;  // floors, ceilings, lighting,
   void *lightingdata; // independent of one another

   // jff 2/26/98 lockout machinery for stairbuilding
   int stairlock;   // -2 on first locked -1 after thinker done 0 normally
   int prevsec;     // -1 or number of sector for previous step
   int nextsec;     // -1 or number of next step sector

   // killough 3/7/98: support flat heights drawn at another sector's heights
   int heightsec;    // other sector, or -1 if no other sector

   int bottommap, midmap, topmap; // killough 4/4/98: dynamic colormaps

   // list of mobjs that are at least partially in the sector
   // thinglist is a subset of touching_thinglist
   struct msecnode_s *touching_thinglist;               // phares 3/14/98

   int linecount;
   struct line_s **lines;

   // killough 10/98: support skies coming from sidedefs. Allows scrolling
   // skies and other effects. No "level info" kind of lump is needed,
   // because you can use an arbitrary number of skies per level with this
   // method. This field only applies when skyflatnum is used for floorpic
   // or ceilingpic, because the rest of Doom needs to know which is sky
   // and which isn't, etc.

   int sky;

   // killough 3/7/98: floor and ceiling texture offsets
   fixed_t   floor_xoffs,   floor_yoffs;
   fixed_t ceiling_xoffs, ceiling_yoffs;

   // killough 4/11/98: support for lightlevels coming from another sector
   int floorlightsec, ceilinglightsec;

   short floorpic;
   short ceilingpic;
   short lightlevel;
   short special;
   short oldspecial;      //jff 2/16/98 remembers if sector WAS secret (automap)
   short tag;
}
sector_t;

//
// The SideDef.
//

typedef struct
{
   fixed_t textureoffset; // add this to the calculated texture column
   fixed_t rowoffset;     // add this to the calculated texture top
   short toptexture;      // Texture indices. We do not maintain names here.
   short bottomtexture;
   short midtexture;
   sector_t* sector;      // Sector the SideDef is facing.

   // killough 4/4/98, 4/11/98: highest referencing special linedef's type,
   // or lump number of special effect. Allows texture names to be overloaded
   // for other functions.

   int special;

}
side_t;

//
// Move clipping aid for LineDefs.
//
typedef enum
{
   ST_HORIZONTAL,
   ST_VERTICAL,
   ST_POSITIVE,
   ST_NEGATIVE
} slopetype_t;

typedef struct line_s
{
   vertex_t *v1, *v2;     // Vertices, from v1 to v2.
   fixed_t dx, dy;        // Precalculated v2 - v1 for side checking.
   short flags;           // Animation related.
   short special;
   short tag;
   short sidenum[2];      // Visual appearance: SideDefs.
   fixed_t bbox[4];       // A bounding box, for the linedef's extent
   slopetype_t slopetype; // To aid move clipping.
   sector_t *frontsector; // Front and back sector.
   sector_t *backsector;
   int validcount;        // if == validcount, already checked
   void *specialdata;     // thinker_t for reversable actions
   int tranlump;          // killough 4/11/98: translucency filter, -1 == none
   int firsttag,nexttag;  // killough 4/17/98: improves searches for tags.
   int r_validcount;      // cph: if == gametic, r_flags already done
   enum {                 // cph:
      RF_TOP_TILE  = 1,     // Upper texture needs tiling
      RF_MID_TILE = 2,     // Mid texture needs tiling
      RF_BOT_TILE = 4,     // Lower texture needs tiling
      RF_IGNORE   = 8,     // Renderer can skip this line
      RF_CLOSED   =16,     // Line blocks view
   } r_flags;
}
line_t;

// phares 3/14/98
//
// Sector list node showing all sectors an object appears in.
//
// There are two threads that flow through these nodes. The first thread
// starts at touching_thinglist in a sector_t and flows through the m_snext
// links to find all mobjs that are entirely or partially in the sector.
// The second thread starts at touching_sectorlist in an mobj_t and flows
// through the m_tnext links to find all sectors a thing touches. This is
// useful when applying friction or push effects to sectors. These effects
// can be done as thinkers that act upon all objects touching their sectors.
// As an mobj moves through the world, these nodes are created and
// destroyed, with the links changed appropriately.
//
// For the links, NULL means top or end of list.

typedef struct msecnode_s
{
   sector_t          *m_sector; // a sector containing this object
   struct mobj_s     *m_thing;  // this object
   struct msecnode_s *m_tprev;  // prev msecnode_t for this thing
   struct msecnode_s *m_tnext;  // next msecnode_t for this thing
   struct msecnode_s *m_sprev;  // prev msecnode_t for this sector
   struct msecnode_s *m_snext;  // next msecnode_t for this sector
   boolean visited; // killough 4/4/98, 4/7/98: used in search algorithms
}
msecnode_t;

//
// The LineSeg.
//
typedef struct
{
   vertex_t *v1, *v2;
   fixed_t offset;
   angle_t angle;
   side_t* sidedef;
   line_t* linedef;

   boolean   miniseg;

   // Sector references.
   // Could be retrieved from linedef, too
   // (but that would be slower -- killough)
   // backsector is NULL for one sided lines

   sector_t *frontsector, *backsector;
}
seg_t;

//
// A SubSector.
// References a Sector.
// Basically, this is a list of LineSegs,
//  indicating the visible walls that define
//  (all or some) sides of a convex BSP leaf.
//

typedef struct subsector_s
{
   sector_t *sector;
   unsigned short numlines, firstline;
}
subsector_t;

//
// BSP node.
//
typedef struct
{
   fixed_t  x,  y, dx, dy;        // Partition line.
   fixed_t bbox[2][4];            // Bounding box for each child.
   unsigned short children[2];    // If NF_SUBSECTOR its a subsector.
}
node_t;

// posts are runs of non masked source pixels
typedef struct
{
   byte topdelta; // -1 is the last post in a column
   byte length;   // length data bytes follows
}
post_t;

// column_t is a list of 0 or more post_t, (byte)-1 terminated
typedef post_t column_t;

//
// OTHER TYPES
//

// This could be wider for >8 bit display.
// Indeed, true color support is posibble
//  precalculating 24bpp lightmap/colormap LUT.
//  from darkening PLAYPAL to all black.
// Could use even more than 32 levels.

typedef byte lighttable_t;

//
// Masked 2s linedefs
//
typedef struct drawseg_s
{
   seg_t *curline;
   int   x1, x2;
   fixed_t  scale1, scale2, scalestep;
   int   silhouette;   // 0=none, 1=bottom, 2=top, 3=both
   fixed_t  bsilheight;   // do not clip sprites above this
   fixed_t  tsilheight;   // do not clip sprites below this

   // Pointers to lists for sprite clipping,
   //  all three adjusted so [x1] is first value.
   short  *sprtopclip, *sprbottomclip, *maskedtexturecol;

}
drawseg_t;

//
// Patches.
// A patch holds one or more columns.
// Patches are used for sprites and all masked pictures,
// and we compose textures from the TEXTURE1/2 lists
// of patches.
//

typedef struct
{
   short width, height;  // bounding box size
   short leftoffset;     // pixels to the left of origin
   short topoffset;      // pixels below the origin
   int columnofs[8];     // only [width] used
}
patch_t;

// proff: Added for OpenGL
typedef struct
{
   int width,height;
   int leftoffset,topoffset;
   int lumpnum;
}
patchnum_t;

//
// A vissprite_t is a thing that will be drawn during a refresh.
// i.e. a sprite object that is partly visible.
//

typedef struct vissprite_s
{
   int x1, x2;
   fixed_t gx, gy;              // for line side calculation
   fixed_t gz, gzt;             // global bottom / top for silhouette clipping
   fixed_t startfrac;           // horizontal position of x1
   fixed_t scale;
   fixed_t xiscale;             // negative if flipped
   fixed_t texturemid;
   int patch;
   uint_64_t mobjflags;

   // for color translation and shadow draw, maxbright frames as well
   lighttable_t *colormap;

   // killough 3/27/98: height sector for underwater/fake ceiling support
   int heightsec;
}
vissprite_t;

//
// Sprites are patches with a special naming convention
//  so they can be recognized by R_InitSprites.
// The base name is NNNNFx or NNNNFxFx, with
//  x indicating the rotation, x = 0, 1-7.
// The sprite and frame specified by a thing_t
//  is range checked at run time.
// A sprite is a patch_t that is assumed to represent
//  a three dimensional object and may have multiple
//  rotations pre drawn.
// Horizontal flipping is used to save space,
//  thus NNNNF2F5 defines a mirrored patch.
// Some sprites will only have one picture used
// for all views: NNNNF0
//
typedef struct
{
   // If false use 0 for any position.
   // Note: as eight entries are available,
   //  we might as well insert the same name eight times.
   boolean rotate;

   // Lump to use for view angles 0-7.
   short lump[8];

   // Flip bit (1 = flip) to use for view angles 0-7.
   byte flip[8];

}
spriteframe_t;

//
// A sprite definition:
//  a number of animation frames.
//

typedef struct
{
   int numframes;
   spriteframe_t *spriteframes;
}
spritedef_t;

//
// Now what is a visplane, anyway?
//
typedef struct visplane
{
   struct visplane *next;        // Next visplane in hash chain -- killough
   int picnum, lightlevel, minx, maxx;
   fixed_t height;
   fixed_t xoffs, yoffs;         // killough 2/28/98: Support scrolling flats
   unsigned short pad1;          // leave pads for [minx-1]/[maxx+1]
   unsigned short top[SCREENWIDTH];
   unsigned short pad2, pad3;    // killough 2/8/98, 4/25/98
   unsigned short bottom[SCREENWIDTH];
   unsigned short pad4;
}
visplane_t;

#endif