// the interface the game uses to access the engine

extern int curtime;                     // current frame time
extern int lastmillis;                  // last time
extern int elapsedtime;                 // elapsed frame time
extern int totalmillis;                 // total elapsed time
extern int gamespeed, paused;

extern void lightent(extentity &e, float height = 8.0f);
extern void lightreaching(const vec &target, vec &color, vec &dir, bool fast = false, extentity *e = 0, float minambient = 0.4f);

enum { RAY_BB = 1, RAY_POLY = 3, RAY_ALPHAPOLY = 7, RAY_ENTS = 9, RAY_CLIPMAT = 16, RAY_SKIPFIRST = 32, RAY_EDITMAT = 64, RAY_SHADOW = 128, RAY_PASS = 256, RAY_SKIPSKY = 512 };

extern float raycube   (const vec &o, const vec &ray,     float radius = 0, int mode = RAY_CLIPMAT, int size = 0, extentity *t = 0);
extern float raycubepos(const vec &o, const vec &ray, vec &hit, float radius = 0, int mode = RAY_CLIPMAT, int size = 0);
extern float rayfloor  (const vec &o, vec &floor, int mode = 0, float radius = 0);
extern bool  raycubelos(const vec &o, const vec &dest, vec &hitpos);

extern int thirdperson;
extern bool isthirdperson();

// octaedit

enum { EDIT_FACE = 0, EDIT_TEX, EDIT_MAT, EDIT_FLIP, EDIT_COPY, EDIT_PASTE, EDIT_ROTATE, EDIT_REPLACE, EDIT_DELCUBE, EDIT_CALCLIGHT, EDIT_REMIP, EDIT_VSLOT, EDIT_UNDO, EDIT_REDO };

struct selinfo;
struct editinfo;
extern editinfo *localedit;

extern bool editmode;

extern int shouldpacktex(int index);
extern bool packeditinfo(editinfo *e, int &inlen, uchar *&outbuf, int &outlen);
extern bool unpackeditinfo(editinfo *&e, const uchar *inbuf, int inlen, int outlen);
extern void freeeditinfo(editinfo *&e);
extern void pruneundos(int maxremain = 0);
extern bool packundo(int op, int &inlen, uchar *&outbuf, int &outlen);
extern bool unpackundo(const uchar *inbuf, int inlen, int outlen);
extern bool noedit(bool view = false, bool msg = true);
extern void toggleedit(bool force = true);
extern void mpeditface(int dir, int mode, selinfo &sel, bool local);
extern void mpedittex(int tex, int allfaces, selinfo &sel, bool local);
extern bool mpedittex(int tex, int allfaces, selinfo &sel, ucharbuf &buf);
extern void mpeditmat(int matid, int filter, selinfo &sel, bool local);
extern void mpflip(selinfo &sel, bool local);
extern void mpcopy(editinfo *&e, selinfo &sel, bool local);
extern void mppaste(editinfo *&e, selinfo &sel, bool local);
extern void mprotate(int cw, selinfo &sel, bool local);
extern void mpreplacetex(int oldtex, int newtex, bool insel, selinfo &sel, bool local);
extern bool mpreplacetex(int oldtex, int newtex, bool insel, selinfo &sel, ucharbuf &buf);
extern void mpdelcube(selinfo &sel, bool local);
extern void mpremip(bool local);
extern bool mpeditvslot(int delta, int allfaces, selinfo &sel, ucharbuf &buf);
extern void mpcalclight(bool local);

// command
extern int variable(const char *name, int min, int cur, int max, int *storage, identfun fun, int flags);
extern float fvariable(const char *name, float min, float cur, float max, float *storage, identfun fun, int flags);
extern char *svariable(const char *name, const char *cur, char **storage, identfun fun, int flags);
extern void setvar(const char *name, int i, bool dofunc = true, bool doclamp = true);
extern void setfvar(const char *name, float f, bool dofunc = true, bool doclamp = true);
extern void setsvar(const char *name, const char *str, bool dofunc = true);
extern void setvarchecked(ident *id, int val);
extern void setfvarchecked(ident *id, float val);
extern void setsvarchecked(ident *id, const char *val);
extern void touchvar(const char *name);
extern int getvar(const char *name);
extern int getvarmin(const char *name);
extern int getvarmax(const char *name);
extern bool identexists(const char *name);
extern ident *getident(const char *name);
extern ident *newident(const char *name, int flags = 0);
extern ident *readident(const char *name);
extern ident *writeident(const char *name, int flags = 0);
extern bool addcommand(const char *name, identfun fun, const char *narg, int type = ID_COMMAND);
extern uint *compilecode(const char *p);
extern void keepcode(uint *p);
extern void freecode(uint *p);
extern void executeret(const uint *code, tagval &result = *commandret);
extern void executeret(const char *p, tagval &result = *commandret);
extern void executeret(ident *id, tagval *args, int numargs, bool lookup = false, tagval &result = *commandret);
extern char *executestr(const uint *code);
extern char *executestr(const char *p);
extern char *executestr(ident *id, tagval *args, int numargs, bool lookup = false);
extern char *execidentstr(const char *name, bool lookup = false);
extern int execute(const uint *code);
extern int execute(const char *p);
extern int execute(ident *id, tagval *args, int numargs, bool lookup = false);
extern int execident(const char *name, int noid = 0, bool lookup = false);
extern float executefloat(const uint *code);
extern float executefloat(const char *p);
extern float executefloat(ident *id, tagval *args, int numargs, bool lookup = false);
extern float execidentfloat(const char *name, float noid = 0, bool lookup = false);
extern bool executebool(const uint *code);
extern bool executebool(const char *p);
extern bool executebool(ident *id, tagval *args, int numargs, bool lookup = false);
extern bool execidentbool(const char *name, bool noid = false, bool lookup = false);
extern bool execfile(const char *cfgfile, bool msg = true);
extern void alias(const char *name, const char *action);
extern void alias(const char *name, tagval &v);
extern const char *getalias(const char *name);
extern const char *escapestring(const char *s);
extern const char *escapeid(const char *s);
static inline const char *escapeid(ident &id) { return escapeid(id.name); }
extern bool validateblock(const char *s);
extern void explodelist(const char *s, vector<char *> &elems, int limit = -1);
extern char *indexlist(const char *s, int pos);
extern int listlen(const char *s);
extern void printvar(ident *id);
extern void printvar(ident *id, int i);
extern void printfvar(ident *id, float f);
extern void printsvar(ident *id, const char *s);
extern int clampvar(ident *id, int i, int minval, int maxval);
extern float clampfvar(ident *id, float f, float minval, float maxval);
extern void loopiter(ident *id, identstack &stack, const tagval &v);
extern void loopend(ident *id, identstack &stack);

#define loopstart(id, stack) if((id)->type != ID_ALIAS) return; identstack stack;
static inline void loopiter(ident *id, identstack &stack, int i) { tagval v; v.setint(i); loopiter(id, stack, v); }
static inline void loopiter(ident *id, identstack &stack, float f) { tagval v; v.setfloat(f); loopiter(id, stack, v); }
static inline void loopiter(ident *id, identstack &stack, const char *s) { tagval v; v.setstr(newstring(s)); loopiter(id, stack, v); }

// console

enum
{
    CON_INFO  = 1<<0,
    CON_WARN  = 1<<1,
    CON_ERROR = 1<<2,
    CON_DEBUG = 1<<3,
    CON_INIT  = 1<<4,
    CON_ECHO  = 1<<5
};

extern void conoutf(const char *s, ...) PRINTFARGS(1, 2);
extern void conoutf(int type, const char *s, ...) PRINTFARGS(2, 3);
extern void conoutfv(int type, const char *fmt, va_list args);

// main
extern void fatal(const char *s, ...) PRINTFARGS(1, 2);

// texture

struct VSlot;

// dynlight
enum
{
    DL_SHRINK = 1<<8,
    DL_EXPAND = 1<<9,
    DL_FLASH  = 1<<10
};

extern void adddynlight(const vec &o, float radius, const vec &color, int fade = 0, int peak = 0, int flags = 0, float initradius = 0, const vec &initcolor = vec(0, 0, 0), physent *owner = NULL, const vec &dir = vec(0, 0, 0), int spot = 0);
extern void dynlightreaching(const vec &target, vec &color, vec &dir, bool hud = false);
extern void removetrackeddynlights(physent *owner = NULL);

// rendergl
extern physent *camera1;
extern vec worldpos, camdir, camright, camup;
extern float curfov, fovy, aspect;

extern void disablezoom();

extern vec calcavatarpos(const vec &pos, float dist);
extern vec calcmodelpreviewpos(const vec &radius, float &yaw);

extern void damageblend(int n);
extern void damagecompass(int n, const vec &loc);

extern vec minimapcenter, minimapradius, minimapscale;
extern void bindminimap();

extern matrix4 hudmatrix;
extern void resethudmatrix();
extern void pushhudmatrix();
extern void flushhudmatrix(bool flushparams = true);
extern void pophudmatrix(bool flush = true, bool flushparams = true);
extern void pushhudscale(float sx, float sy = 0);
extern void pushhudtranslate(float tx, float ty, float sx = 0, float sy = 0);
extern void resethudshader();

// stain
enum
{
    STAIN_BLOOD = 0,
    STAIN_PULSE_SCORCH,
    STAIN_RAIL_HOLE,
    STAIN_PULSE_GLOW,
    STAIN_RAIL_GLOW
};

extern void addstain(int type, const vec &center, const vec &surface, float radius, const bvec &color = bvec(0xFF, 0xFF, 0xFF), int info = 0);

static inline void addstain(int type, const vec &center, const vec &surface, float radius, int color, int info = 0)
{
    addstain(type, center, surface, radius, bvec::hexcolor(color), info);
}

// physics
extern vec collidewall;
extern int collideinside;
extern physent *collideplayer;

extern void moveplayer(physent *pl, int moveres, bool local);
extern bool moveplayer(physent *pl, int moveres, bool local, int curtime);
extern void crouchplayer(physent *pl, int moveres, bool local);
extern bool collide(physent *d, const vec &dir = vec(0, 0, 0), float cutoff = 0.0f, bool playercol = true, bool insideplayercol = false);
extern bool bounce(physent *d, float secs, float elasticity, float waterfric, float grav);
extern bool bounce(physent *d, float elasticity, float waterfric, float grav);
extern void avoidcollision(physent *d, const vec &dir, physent *obstacle, float space);
extern bool overlapsdynent(const vec &o, float radius);
extern bool movecamera(physent *pl, const vec &dir, float dist, float stepdist);
extern void physicsframe();
extern void dropenttofloor(entity *e);
extern bool droptofloor(vec &o, float radius, float height);

extern void vecfromyawpitch(float yaw, float pitch, int move, int strafe, vec &m);
extern void vectoyawpitch(const vec &v, float &yaw, float &pitch);
extern void updatephysstate(physent *d);
extern void cleardynentcache();
extern void updatedynentcache(physent *d);
extern bool entinmap(dynent *d, bool avoidplayers = false);
extern void findplayerspawn(dynent *d, int forceent = -1, int tag = 0);

// sound
enum
{
    SND_MAP     = 1<<0,
    SND_NO_ALT  = 1<<1,
    SND_USE_ALT = 1<<2
};

inline int playsound(
    int, const vec * = NULL, extentity * = NULL, int = 0, int = 0, int = 0,
    int = -1, int = 0, int = -1
) {
    return -1;
}

// rendermodel
enum { MDL_CULL_VFC = 1<<0, MDL_CULL_DIST = 1<<1, MDL_CULL_OCCLUDED = 1<<2, MDL_CULL_QUERY = 1<<3, MDL_FULLBRIGHT = 1<<4, MDL_NORENDER = 1<<5, MDL_MAPMODEL = 1<<6, MDL_NOBATCH = 1<<7, MDL_ONLYSHADOW = 1<<8, MDL_NOSHADOW = 1<<9, MDL_FORCESHADOW = 1<<10, MDL_FORCETRANSPARENT = 1<<11 };

struct model;
struct modelattach
{
    const char *tag, *name;
    int anim, basetime;
    vec *pos;
    model *m;

    modelattach() : tag(NULL), name(NULL), anim(-1), basetime(0), pos(NULL), m(NULL) {}
    modelattach(const char *tag, const char *name, int anim = -1, int basetime = 0) : tag(tag), name(name), anim(anim), basetime(basetime), pos(NULL), m(NULL) {}
    modelattach(const char *tag, vec *pos) : tag(tag), name(NULL), anim(-1), basetime(0), pos(pos), m(NULL) {}
};

extern void rendermodel(const char *mdl, int anim, const vec &o, float yaw = 0, float pitch = 0, float roll = 0, int cull = MDL_CULL_VFC | MDL_CULL_DIST | MDL_CULL_OCCLUDED, dynent *d = NULL, modelattach *a = NULL, int basetime = 0, int basetime2 = 0, float size = 1, const vec4 &color = vec4(1, 1, 1, 1));
extern int intersectmodel(const char *mdl, int anim, const vec &pos, float yaw, float pitch, float roll, const vec &o, const vec &ray, float &dist, int mode = 0, dynent *d = NULL, modelattach *a = NULL, int basetime = 0, int basetime2 = 0, float size = 1);
extern void abovemodel(vec &o, const char *mdl);
extern void renderclient(dynent *d, const char *mdlname, modelattach *attachments, int hold, int attack, int attackdelay, int lastaction, int lastpain, float scale = 1, bool ragdoll = false, float trans = 1);
extern void interpolateorientation(dynent *d, float &interpyaw, float &interppitch);
extern void setbbfrommodel(dynent *d, const char *mdl);
extern const char *mapmodelname(int i);
extern model *loadmodel(const char *name, int i = -1, bool msg = false);
extern void preloadmodel(const char *name);
extern void flushpreloadedmodels(bool msg = true);
extern bool matchanim(const char *name, const char *pattern);

// ragdoll

extern void moveragdoll(dynent *d);
extern void cleanragdoll(dynent *d);

// client
extern bool haslocalclients();
extern bool isconnected(bool attempt = false, bool local = true);
extern bool multiplayer(bool msg = true);