raze-gles/polymer/eduke32/source/lunatic/defs_common.lua

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-- This file contains LuaJIT definitions of stuff that's common to the game and
-- editor. The 'decl' function is expected to be defined in the global
-- environment.
local ffi = require("ffi")
local ffiC = ffi.C
local bit = require("bit")
local string = require("string")
local error = error
local pairs = pairs
local setmetatable = setmetatable
local tostring = tostring
local decl = decl
local getfenv = getfenv
decl "void OSD_Printf(const char *fmt, ...);"
print = function(str)
-- our "print" doesn't use the global "tostring", but the initial one
str = tostring(str)
if (type(str) ~= "string") then
error("invalid argument to print: must be convertible to a string")
end
ffiC.OSD_Printf("%s\n", str)
end
local print=print
module(...)
--== Core engine structs ==--
local SPRITE_STRUCT = [[
{
int32_t x, y, z;
uint16_t cstat;
const int16_t picnum;
int8_t shade;
uint8_t pal, clipdist, filler;
uint8_t xrepeat, yrepeat;
int8_t xoffset, yoffset;
const int16_t sectnum, statnum;
int16_t ang;
// NOTE: yvel is often used as player index in game code. Make xvel/zvel
// "const" for consistency, too.
const int16_t owner, xvel, yvel, zvel;
int16_t lotag, hitag, extra;
}
]]
-- Converts a template struct definition to an internal, unrestricted one.
function strip_const(structstr)
return string.gsub(structstr, "const ", "");
end
-- NOTE for FFI definitions: we're compiling EDuke32 with -funsigned-char, so
-- we need to take care to declare chars as unsigned whenever it matters, for
-- example if it represents a palette index. (I think it's harmless for stuff
-- like passing a function argument, but it should be done there for clarity.)
-- TODO: provide getters for unsigned {hi,lo}tag?
ffi.cdef([[
#pragma pack(push,1)
typedef struct
{
const int16_t wallptr, wallnum;
int32_t ceilingz, floorz;
uint16_t ceilingstat, floorstat;
const int16_t ceilingpicnum;
int16_t ceilingheinum;
int8_t ceilingshade;
uint8_t ceilingpal, ceilingxpanning, ceilingypanning;
const int16_t floorpicnum;
int16_t floorheinum;
int8_t floorshade;
uint8_t floorpal, floorxpanning, floorypanning;
uint8_t visibility, filler;
int16_t lotag, hitag, extra;
} sectortype;
typedef struct
{
int32_t x, y;
const int16_t point2, nextwall, nextsector;
uint16_t cstat;
const int16_t picnum, overpicnum;
int8_t shade;
uint8_t pal, xrepeat, yrepeat, xpanning, ypanning;
int16_t lotag, hitag, extra;
} walltype;
typedef struct
]].. SPRITE_STRUCT ..[[
spritetype;
typedef struct
]].. strip_const(SPRITE_STRUCT) ..[[
spritetype_u_t;
typedef struct {
const uint32_t mdanimtims;
const int16_t mdanimcur;
int16_t angoff, pitch, roll;
int32_t xoff, yoff, zoff;
uint8_t flags;
uint8_t xpanning, ypanning;
const uint8_t filler;
float alpha;
const int32_t _do_not_use1;
const int32_t _do_not_use2;
} spriteext_t;
typedef struct {
int32_t x, y, z;
} vec3_t;
typedef struct {
vec3_t pos;
int16_t sprite, wall, sect;
} hitdata_t;
typedef struct {
unsigned char r,g,b,f;
} palette_t;
#pragma pack(pop)
]])
local vec3_ct = ffi.typeof("vec3_t")
local hitdata_ct = ffi.typeof("hitdata_t")
ffi.cdef[[const int32_t engine_main_arrays_are_static, engine_v8;]]
--== Engine data and functions ==--
-- NOTE TO SELF: This is not C, never EVER write
-- if (x)
-- when checking a C variable x for 'thuthiness'
if (ffiC.engine_main_arrays_are_static ~= 0) then
decl[[
sectortype sector[];
walltype wall[];
spritetype sprite[];
spriteext_t spriteext[];
]]
else
decl[[
sectortype *sector;
walltype *wall;
spritetype *sprite;
spriteext_t *spriteext;
]]
end
if (ffiC.engine_v8 == 0) then
-- V7
ffi.cdef[[
enum
{
MAXSECTORS = 1024,
MAXWALLS = 8192,
MAXSPRITES = 4096,
}
]]
else
-- V8
ffi.cdef[[
enum
{
MAXSECTORS = 4096,
MAXWALLS = 16384,
MAXSPRITES = 16384,
}
]]
end
ffi.cdef[[
enum {
MAXSTATUS = 1024,
MAXTILES = 30720,
MAXBUNCHES = 256,
CEILING = 0,
FLOOR = 1,
CLIPMASK0 = (1<<16)+1, // blocking
CLIPMASK1 = (256<<16)+64, // hittable
};
]]
ffi.cdef[[
const int16_t numsectors, numwalls;
const int32_t numyaxbunches;
const int32_t totalclock;
const int32_t xdim, ydim;
]]
decl[[
const int16_t headspritesect[MAXSECTORS+1], headspritestat[MAXSTATUS+1];
const int16_t prevspritesect[MAXSPRITES], prevspritestat[MAXSPRITES];
const int16_t nextspritesect[MAXSPRITES], nextspritestat[MAXSPRITES];
const int16_t headsectbunch[2][MAXBUNCHES], nextsectbunch[2][MAXSECTORS];
int16_t yax_getbunch(int16_t i, int16_t cf);
int32_t getceilzofslopeptr(const sectortype *sec, int32_t dax, int32_t day);
int32_t getflorzofslopeptr(const sectortype *sec, int32_t dax, int32_t day);
void getzsofslopeptr(const sectortype *sec, int32_t dax, int32_t day,
int32_t *ceilz, int32_t *florz);
int32_t hitscan(const vec3_t *sv, int16_t sectnum, int32_t vx, int32_t vy, int32_t vz,
hitdata_t *hitinfo, uint32_t cliptype);
int32_t cansee(int32_t x1, int32_t y1, int32_t z1, int16_t sect1,
int32_t x2, int32_t y2, int32_t z2, int16_t sect2);
void neartag(int32_t xs, int32_t ys, int32_t zs, int16_t sectnum, int16_t ange, int16_t *neartagsector, int16_t *neartagwall,
int16_t *neartagsprite, int32_t *neartaghitdist, int32_t neartagrange, uint8_t tagsearch,
int32_t (*blacklist_sprite_func)(int32_t));
int32_t ldist(const spritetype *s1, const spritetype *s2);
int32_t dist(const spritetype *s1, const spritetype *s2);
int32_t inside(int32_t x, int32_t y, int16_t sectnum);
void updatesector(int32_t x, int32_t y, int16_t *sectnum);
void updatesectorbreadth(int32_t x, int32_t y, int16_t *sectnum);
void updatesectorz(int32_t x, int32_t y, int32_t z, int16_t *sectnum);
void rotatesprite(int32_t sx, int32_t sy, int32_t z, int16_t a, int16_t picnum,
int8_t dashade, unsigned char dapalnum, int32_t dastat,
int32_t cx1, int32_t cy1, int32_t cx2, int32_t cy2);
]]
-- misc. functions
ffi.cdef[[
double gethitickms(void);
int32_t krand(void);
int32_t ksqrt(uint32_t num);
int32_t __fastcall getangle(int32_t xvect, int32_t yvect);
]]
local ivec3_
local ivec3_mt = {
-- '^' is the "translate upwards" operator
__pow = function(v, zofs)
return ivec3_(v.x, v.y, v.z-zofs)
end,
}
ivec3_ = ffi.metatype("vec3_t", ivec3_mt)
local sectortype_mt = {
__index = {
ceilingzat = function(s, pos)
return ffiC.getceilzofslopeptr(s, pos.x, pos.y)
end,
floorzat = function(s, pos)
return ffiC.getflorzofslopeptr(s, pos.x, pos.y)
end,
}
}
ffi.metatype("sectortype", sectortype_mt)
local walltype_mt = {
__index = {
isblocking = function(w)
return (bit.band(w.cstat, 1)~=0)
end,
ismasked = function(w)
return (bit.band(w.cstat, 16)~=0)
end,
isoneway = function(w)
return (bit.band(w.cstat, 32)~=0)
end,
ishittable = function(w)
return (bit.band(w.cstat, 64)~=0)
end,
}
}
ffi.metatype("walltype", walltype_mt)
local spritetype_ptr_ct = ffi.typeof("spritetype_u_t *")
spritetype_mt = {
__pow = function(s, zofs)
return ivec3_(s.x, s.y, s.z-zofs)
end,
__index = {
set_picnum = function(s, tilenum)
if (tilenum >= ffiC.MAXTILES+0ULL) then
error("attempt to set invalid picnum "..tilenum, 2)
end
ffi.cast(spritetype_ptr_ct, s).picnum = tilenum
end,
set_yvel = function(s, yvel)
-- XXX: for now, no checking
ffi.cast(spritetype_ptr_ct, s).yvel = yvel
end,
},
}
-- The user of this module can insert additional "spritetype" metamethods and
-- register them with "ffi.metatype".
---=== Restricted access to C variables from Lunatic ===---
-- set metatable and forbid setting it further
function setmtonce(tab, mt)
mt.__metatable = true
return setmetatable(tab, mt)
end
---- indirect C array access ----
local sector_mt = {
__index = function(tab, key)
if (key >= 0 and key < ffiC.numsectors) then return ffiC.sector[key] end
error('out-of-bounds sector[] read access', 2)
end,
__newindex = function(tab, key, val) error('cannot write directly to sector[] struct', 2) end,
}
local wall_mt = {
__index = function(tab, key)
if (key >= 0 and key < ffiC.numwalls) then return ffiC.wall[key] end
error('out-of-bounds wall[] read access', 2)
end,
__newindex = function(tab, key, val) error('cannot write directly to wall[] struct', 2) end,
}
-- create a safe indirection for an ffi.C array
function creategtab(ctab, maxidx, name)
local tab = {}
local tmpmt = {
__index = function(tab, key)
if (key>=0 and key < maxidx) then
return ctab[key]
end
error('out-of-bounds '..name..' read access', 2)
end,
__newindex = function(tab, key, val)
error('cannot write directly to '..name, 2)
end,
}
return setmtonce(tab, tmpmt)
end
local vars_to_ignore = {}
for varname,_ in pairs(getfenv(1)) do
-- print("IGNORE "..varname)
vars_to_ignore[varname] = true
end
--== ALL GLOBALS FROM HERE ON ARE EXPORTED UPWARDS (see create_globals() below) ==--
sector = setmtonce({}, sector_mt)
wall = setmtonce({}, wall_mt)
sprite = creategtab(ffiC.sprite, ffiC.MAXSPRITES, 'sprite[] struct')
spriteext = creategtab(ffiC.spriteext, ffiC.MAXSPRITES, 'spriteext[] struct')
headspritesect = creategtab(ffiC.headspritesect, ffiC.MAXSECTORS, 'headspritesect[]')
-- TODO: allow sprite freelist access via the status list for CON compatibility?
headspritestat = creategtab(ffiC.headspritestat, ffiC.MAXSTATUS, 'headspritestat[]')
nextspritesect = creategtab(ffiC.nextspritesect, ffiC.MAXSPRITES, 'nextspritesect[]')
nextspritestat = creategtab(ffiC.nextspritestat, ffiC.MAXSPRITES, 'nextspritestat[]')
prevspritesect = creategtab(ffiC.prevspritesect, ffiC.MAXSPRITES, 'prevspritesect[]')
prevspritestat = creategtab(ffiC.prevspritestat, ffiC.MAXSPRITES, 'prevspritestat[]')
function check_sector_idx(sectnum)
if (sectnum >= ffiC.numsectors+0ULL) then
error("passed out-of-bounds sector number "..sectnum, 3)
end
end
--== Per-sector/per-statnum sprite iterators ==--
local function iter_spritesofsect(sect, i)
if (i < 0) then
i = ffiC.headspritesect[sect]
else
i = ffiC.nextspritesect[i]
end
if (i >= 0) then return i end
end
function spritesofsect(sect)
check_sector_idx(sect)
return iter_spritesofsect, sect, -1
end
local function iter_spritesofstat(stat, i)
if (i < 0) then
i = ffiC.headspritestat[stat]
else
i = ffiC.nextspritestat[i]
end
if (i >= 0) then return i end
end
function spritesofstat(stat)
if (stat >= ffiC.MAXSTATUS+0ULL) then
error("passed invalid statnum to spritesofstat iterator", 2)
end
return iter_spritesofstat, stat, -1
end
--== TROR iterators ==--
local function iter_sectorsofbunch(cf, i)
if (i < 0) then
i = ffiC.headsectbunch[cf][-i-1];
else
i = ffiC.nextsectbunch[cf][i];
end
if (i >= 0) then return i end
end
function sectorsofbunch(bunchnum, cf)
if (bunchnum < 0 or bunchnum >= ffiC.numyaxbunches) then
error("passed invalid bunchnum to sectorsofbunch iterator", 2)
end
if (cf ~= 0 and cf ~= 1) then
error("passed invalid 'cf' to sectorsofbunch iterator, must be 0 or 1", 2)
end
return iter_sectorsofbunch, cf, -bunchnum-1
end
function getbunch(sectnum, cf)
check_sector_idx(sectnum)
if (cf ~= 0 and cf ~= 1) then
error("passed invalid 'cf' to getbunch, must be 0 or 1", 2)
end
return ffiC.yax_getbunch(sectnum, cf)
end
---=== Engine functions, wrapped for Lua convenience ===---
-- returns a hitdata_ct
-- TODO: make v[xyz] be passed as one aggregate, too?
-- Additionally, permit different coordinates? (ang&horiz, ...)
function hitscan(pos, sectnum, vx,vy,vz, cliptype)
check_sector_idx(sectnum)
local vec = vec3_ct(pos.x, pos.y, pos.z)
local hitdata = hitdata_ct()
ffiC.hitscan(vec, sectnum, vx,vy,vz, hitdata, cliptype)
return hitdata
end
function cansee(pos1,sect1, pos2,sect2)
if (sect1 >= ffiC.numsectors+0ULL) then
error("passed out-of-bounds first sector number "..sect1, 2)
end
if (sect2 >= ffiC.numsectors+0ULL) then
error("passed out-of-bounds second sector number "..sect2, 2)
end
local ret = ffiC.cansee(pos1.x,pos1.y,pos1.z, sect1,
pos2.x,pos2.y,pos2.z, sect2)
return (ret~=0)
end
ffi.cdef[[
typedef struct {
int32_t sector, wall, sprite;
int32_t dist;
} neartag_ret_t;
]]
local neartag_ret_ct = ffi.typeof("const neartag_ret_t")
-- TODO: make tagsearch something more convenient
function neartag(pos, sectnum, ang, range, tagsearch)
check_sector_idx(sectnum)
local newar = function() return ffi.new("int16_t [1]") end
local a, b, c, d = newar(), newar(), newar(), ffi.new("int32_t [1]")
ffiC.neartag(pos.x, pos.y, pos.z, sectnum, ang, a, b, c, d, range, tagsearch, nil)
return neartag_ret_ct(a[0], b[0], c[0], d[0])
end
-- TODO: reimplement in Lua (benefit: no int overflow)? On the engine side,
-- make it take a sectortype pointer, and add as metamethod to our LuaJIT
-- sector type ("contains"?)
function inside(pos, sectnum)
check_sector_idx(sectnum)
return (ffiC.inside(pos.x, pos.y, sectnum)==1)
end
-- TODO: should these rather be one function, and the specific kind of updating
-- controlled by an argument?
function updatesector(pos, sectnum)
local sect = ffi.new("int16_t [1]")
sect[0] = sectnum
ffiC.updatesector(pos.x, pos.y, sect)
return sect[0]
end
function updatesectorbreadth(pos, sectnum)
local sect = ffi.new("int16_t [1]")
sect[0] = sectnum
ffiC.updatesectorbreadth(pos.x, pos.y, sect)
return sect[0]
end
function updatesectorz(pos, sectnum)
local sect = ffi.new("int16_t [1]")
sect[0] = sectnum
ffiC.updatesectorz(pos.x, pos.y, pos.z, sect)
return sect[0]
end
-- This is supposed to be run from the file that 'require's this module to take
-- over the non-local variables from here into the global environment.
function create_globals(_G_their)
local _G_our = getfenv(1)
vars_to_ignore["create_globals"] = true
for varname,obj in pairs(_G_our) do
if (not vars_to_ignore[varname]) then
-- print("EXPORT "..varname)
_G_their[varname] = obj
end
end
end