w_level_lumps.h

/*
 * level data lumps
 */

#ifndef W_LEVEL_LUMPS_H
#define W_LEVEL_LUMPS_H

#include <stdint.h>

/* level lump order */
enum {
    ML_LABEL,
    ML_THINGS,
    ML_LINEDEFS,
    ML_SIDEDEFS,
    ML_VERTEXES,
    ML_SEGS,
    ML_SSECTORS,
    ML_NODES,
    ML_SECTORS,
    ML_REJECT,
    ML_BLOCKMAP
};

/* lump data layout */

/* vertex */
typedef struct {
    int16_t     x;
    int16_t     y;
} vertexlump_t;

/* sidedef, defines wall appearance */
typedef struct {
    int16_t     xoff;             // texture x offset
    int16_t     yoff;             // texture y offset
    char        toptexture[8];    // top texture name
    char        bottomtexture[8]; // bottom texture name
    char        midtexture[8];    // middle texture name
    int16_t     sector;           // sector number the wall is facing
} sidedeflump_t;

/* linedef, used for editing and input for BSP builder */
typedef struct {
    int16_t     v1;         // start vertex
    int16_t     v2;         // end vertex
    int16_t     flags;      // flags
    int16_t     special;    // special type
    int16_t     tag;        // sector tag
    int16_t     sidenum[2]; // sidedefs, sidenum[1] = -1 if one sided
} linedeflump_t;

/* map sector, from editing */
typedef struct {
    int16_t     floorheight;
    int16_t     ceilingheight;
    char        floortexture[8];   // floor texture name
    char        ceilingtexture[8]; // ceiling texture name
    int16_t     lightlevel;        // sector brightness
    int16_t     special;           // sector properties (blink, player damage)
    int16_t     tag;               // tag for actions specified in linedefs
} sectorlump_t;

/* subsectors as generated by BSP */
typedef struct {
    int16_t     numsegs;  // number of line segments in subsector
    int16_t     firstseg; // index of first line segment, stored sequentially
} subsectorlump_t;

/* line segment, result of splitting linedefs with BSP splitter */
typedef struct {
    int16_t     v1;      // start vertex
    int16_t     v2;      // end vertex
    int16_t     angle;   // seg angle
    int16_t     linedef; // linedef index this seg belongs to
    int16_t     side;    // 0: right (front) side of linedef, 1: left (back) side
    int16_t     offset;  // distance from start of linedef to start of seg
} seglump_t;



/* BSP node */
#define NF_SUBSECTOR 0x8000 // sign bit is used to indicate a leaf

typedef struct {
    // partition line from (x,y) to (x+dx,y+dy)
    int16_t     x;
    int16_t     y;
    int16_t     dx;
    int16_t     dy;

    // bounding box for each child
    // each bounding box has top, bottom, left, right coordinates
    int16_t     bbox[2][4];

    // child node indices
    // if NF_SUBSECTOR is set the child is a leaf
    uint16_t     children[2];
} nodelump_t;



/* map thing (item, monster, player, ...) */
typedef struct {
    int16_t     x;     // x position
    int16_t     y;     // y position
    int16_t     angle; // angle facing
    int16_t     type;  // thing type
    int16_t     flags; // skill/visibility flags
} thinglump_t;

#endif // W_LEVEL_LUMPS_H