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// C ref: light.c — 985 lines
//
// Ported functions:
// new_light_source() — add a light source
// del_light_source() — remove a light source
// do_light_sources() — mark TEMP_LIT locations for vision
// save_light_sources() — save light sources (stub)
// restore_light_sources() — restore light sources (stub)
// relink_light_sources() — relink light source obj/mon pointers
// obj_move_light_source() — reassign light source from src to dest obj
// any_light_source() — return true if any light sources exist
// snuff_light_source() — extinguish burning light source at position
// obj_is_burning() — is object actively burning?
// obj_sheds_light() — does object shed light?
// begin_burn() — light an object (C: timeout.c)
// end_burn() — extinguish a burning object (C: timeout.c)
// artifact_light() — does object emit artifact/special light?
// arti_light_description() — adverb for artifact light
// arti_light_radius() — radius for artifact light
// candle_light_range() — compute candle/candelabrum light radius
// obj_split_light_source() — copy light source for split stack
// obj_merge_light_sources() — merge light sources (candles)
// obj_adjust_light_radius() — change light source radius
// wiz_light_sources() — #lightsources wizard command
// find_mid() — find monster by m_id
// show_transient_light() — show light for thrown/kicked lit object (stub)
// transient_light_cleanup() — cleanup after transient light (stub)
import { game } from './gstate.js';
import {
LS_OBJECT, LS_MONSTER, MAX_RADIUS, COLNO, ROWNO,
COULD_SEE, TEMP_LIT, W_ARM,
BURN_OBJECT, TIMER_OBJECT, OBJ_INVENT, OBJ_FREE, OBJ_FLOOR, OBJ_MINVENT,
CONTAINED_TOO, BURIED_TOO,
FM_FMON, FM_MIGRATE, FM_MYDOGS, FM_YOU, FM_EVERYWHERE,
} from './const.js';
import { impossible } from './pline.js';
import { circle_data, clear_path } from './vision.js';
import { ART_SUNSWORD, ART_NONARTIFACT } from './artifacts.js';
import { BRASS_LANTERN, CANDELABRUM_OF_INVOCATION, GOLD_DRAGON_SCALES, GOLD_DRAGON_SCALE_MAIL, Is_candle, MAGIC_LAMP, OIL_LAMP, POT_OIL, TALLOW_CANDLE, WAX_CANDLE } from './objects.js';
import { find_oid } from './shk.js';
import { start_timer, stop_timer } from './timeout.js';
import { carried } from './invent.js';
import { update_inventory } from './mon.js';
import { u_at } from './const.js';
import { xname } from './objnam.js';
import { is_art, obj_to_any } from './hacklib.js';
// ── Local stubs for functions not yet available as imports ──
import { get_obj_location } from './mkobj.js';
// C ref: mkobj.c get_mon_location — returns {x, y} or null
function get_mon_location(mon) {
if (!mon) return null;
if (mon === game.youmonst) return { x: game.u.ux, y: game.u.uy };
if (mon.mx > 0) return { x: mon.mx, y: mon.my };
return null;
}
// obj_to_any: imported from hacklib.js
// C ref: objnam.c — stub
// C ref: artifact.c is_art
// C ref: objclass.h Is_candle macro
// Is_candle: imported from objects.js
function ignitable(obj) {
if (!obj) return false;
const otyp = obj.otyp;
return (otyp === BRASS_LANTERN || otyp === OIL_LAMP || otyp === MAGIC_LAMP
|| otyp === CANDELABRUM_OF_INVOCATION
|| otyp === TALLOW_CANDLE || otyp === WAX_CANDLE
|| otyp === POT_OIL);
}
// C ref: mkobj.c obj_is_local — on-level objects are local
function obj_is_local(obj) {
if (!obj) return false;
return obj.where === OBJ_FLOOR || obj.where === OBJ_INVENT
|| obj.where === OBJ_MINVENT;
}
// C ref: light.c #define mon_is_local(mon) ((mon)->mx > 0)
function mon_is_local(mon) { return mon && mon.mx > 0; }
// C ref: restore.c lookup_id_mapping — stub
function lookup_id_mapping(nid, out) { return false; }
// ── Light source flags ──
const LSF_SHOW = 0x1;
const LSF_NEEDS_FIXUP = 0x2;
const LSF_IS_PROBLEMATIC = 0x4;
// ── circle_start table (from vision.c) ──
const circle_start = [0, 1, 3, 6, 10, 15, 21, 38, 36, 45, 55, 66, 78, 91, 105, 120];
// C ref: vision.c circle_ptr
function circle_ptr(range) {
if (range < 1 || range > 15) return null;
return circle_data.slice(circle_start[range], circle_start[range + 1] ?? circle_data.length);
}
// ── Light source list ──
// C uses gl.light_base as a singly-linked list.
// JS uses game.light_base as an array of light_source objects.
function get_light_base() {
if (!game.light_base) game.light_base = [];
return game.light_base;
}
// ── new_light_source ──
// C ref: light.c:62
export function new_light_source(x, y, range, type, id) {
new_light_core(x, y, range, type, id);
}
// C ref: light.c:69 new_light_core
function new_light_core(x, y, range, type, id) {
if (range > MAX_RADIUS || range < 0
|| (range === 0 && (type !== LS_OBJECT || id.a_obj !== null))) {
impossible(`new_light_source: illegal range ${range}`);
return null;
}
const ls = {
x, y,
range,
type,
id: { ...id },
flags: 0,
};
get_light_base().unshift(ls); // prepend like C linked list
game.vision_full_recalc = 1;
return ls;
}
// ── del_light_source ──
// C ref: light.c:99
export function del_light_source(type, id) {
const sources = get_light_base();
let tmp_id_uint = 0;
switch (type) {
case 0: // LS_NONE
impossible('del_light_source:type=none');
break;
case LS_OBJECT:
tmp_id_uint = id.a_obj ? id.a_obj.o_id : 0;
break;
case LS_MONSTER:
tmp_id_uint = id.a_monst ? id.a_monst.m_id : 0;
break;
default:
break;
}
for (let i = 0; i < sources.length; i++) {
const curr = sources[i];
if (curr.type !== type) continue;
// C compares curr->id.a_obj with (needs_fixup ? tmp_id.a_obj : id->a_obj)
if (curr.flags & LSF_NEEDS_FIXUP) {
// During fixup, compare by numeric id
const curr_id = curr.type === LS_OBJECT
? (curr.id.a_obj ? curr.id.a_obj.o_id : 0)
: (curr.id.a_monst ? curr.id.a_monst.m_id : 0);
if (curr_id !== tmp_id_uint) continue;
} else {
if (curr.id.a_obj !== id.a_obj) continue;
}
// delete_ls: remove from list
sources.splice(i, 1);
game.vision_full_recalc = 1;
return;
}
impossible(`del_light_source: not found type=${type}`);
}
// ── do_light_sources ──
// C ref: light.c:169 — mark TEMP_LIT locations
export function do_light_sources(cs_rows) {
const sources = get_light_base();
let at_hero_range = 0;
for (const ls of sources) {
ls.flags &= ~LSF_SHOW;
// Check for moved light sources — update positions
if (ls.type === LS_OBJECT) {
if (ls.range === 0) {
// camera flash; caller has set ls.x, ls.y
ls.flags |= LSF_SHOW;
} else {
const loc = get_obj_location(ls.id.a_obj, 0);
if (loc) {
ls.x = loc.x;
ls.y = loc.y;
ls.flags |= LSF_SHOW;
}
}
} else if (ls.type === LS_MONSTER) {
const loc = get_mon_location(ls.id.a_monst);
if (loc) {
ls.x = loc.x;
ls.y = loc.y;
ls.flags |= LSF_SHOW;
}
}
// minor optimization: don't bother with duplicate at hero
if (u_at(ls.x, ls.y)) {
if (at_hero_range >= ls.range)
ls.flags &= ~LSF_SHOW;
else
at_hero_range = ls.range;
}
if (ls.flags & LSF_SHOW) {
const limits = circle_ptr(ls.range);
if (!limits) continue;
let max_y = ls.y + ls.range;
if (max_y >= ROWNO) max_y = ROWNO - 1;
let y = ls.y - ls.range;
if (y < 0) y = 0;
for (; y <= max_y; y++) {
const row = cs_rows[y];
if (!row) continue;
const offset = limits[Math.abs(y - ls.y)];
let min_x = ls.x - offset;
if (min_x < 1) min_x = 1;
let max_x = ls.x + offset;
if (max_x >= COLNO) max_x = COLNO - 1;
if (u_at(ls.x, ls.y)) {
// Light at hero: use COULD_SEE bits
for (let x = min_x; x <= max_x; x++)
if (row[x] & COULD_SEE)
row[x] |= TEMP_LIT;
} else {
for (let x = min_x; x <= max_x; x++)
if ((ls.x === x && ls.y === y)
|| clear_path(ls.x, ls.y, x, y))
row[x] |= TEMP_LIT;
}
}
}
}
}
// ── save_light_sources ──
// C ref: light.c:421 — stub for save/restore
export function save_light_sources(nhfp, range) {
// TODO: full save implementation
discard_flashes();
game.vision_full_recalc = 0;
}
// ── restore_light_sources ──
// C ref: light.c:479 — stub for save/restore
export function restore_light_sources(nhfp) {
// TODO: full restore implementation
}
// ── relink_light_sources ──
// C ref: light.c:517
export function relink_light_sources(ghostly) {
const sources = get_light_base();
for (const ls of sources) {
if (ls.flags & LSF_NEEDS_FIXUP) {
if (ls.type === LS_OBJECT || ls.type === LS_MONSTER) {
let nid = ls.id.a_uint;
if (ghostly && !lookup_id_mapping(nid, {}))
throw new Error('relink_light_sources: no id mapping');
let which = '\0';
if (ls.type === LS_OBJECT) {
ls.id.a_obj = find_oid(nid);
if (!ls.id.a_obj) which = 'o';
} else {
ls.id.a_monst = find_mid(nid, FM_EVERYWHERE);
if (!ls.id.a_monst) which = 'm';
}
if (which !== '\0')
throw new Error(`relink_light_sources: can't find ${which}_id ${nid}`);
} else {
throw new Error(`relink_light_sources: bad type (${ls.type})`);
}
ls.flags &= ~LSF_NEEDS_FIXUP;
}
}
}
// ── obj_move_light_source ──
// C ref: light.c:706
export function obj_move_light_source(src, dest) {
const sources = get_light_base();
for (const ls of sources) {
if (ls.type === LS_OBJECT && ls.id.a_obj === src)
ls.id.a_obj = dest;
}
src.lamplit = 0;
dest.lamplit = 1;
}
// ── any_light_source ──
// C ref: light.c:719
export function any_light_source() {
return get_light_base().length > 0;
}
// ── snuff_light_source ──
// C ref: light.c:729
export function snuff_light_source(x, y) {
const sources = get_light_base();
for (const ls of sources) {
if (ls.type === LS_OBJECT && ls.x === x && ls.y === y) {
const obj = ls.id.a_obj;
if (obj_is_burning(obj)) {
// Sunsword can only be snuffed by unwielding
if (artifact_light(obj))
continue;
end_burn(obj, obj.otyp !== MAGIC_LAMP);
// ls has been removed; return (one light per object)
return;
}
}
}
}
// ── obj_sheds_light ──
// C ref: light.c:763
export function obj_sheds_light(obj) {
return obj_is_burning(obj);
}
// ── obj_is_burning ──
// C ref: light.c:771
export function obj_is_burning(obj) {
return !!(obj && obj.lamplit && (ignitable(obj) || artifact_light(obj)));
}
// ── obj_split_light_source ──
// C ref: light.c:779
export function obj_split_light_source(src, dest) {
const sources = get_light_base();
const len = sources.length;
for (let i = 0; i < len; i++) {
const ls = sources[i];
if (ls.type === LS_OBJECT && ls.id.a_obj === src) {
const new_ls = { ...ls, id: { ...ls.id } };
if (Is_candle(src)) {
ls.range = candle_light_range(src);
new_ls.range = candle_light_range(dest);
game.vision_full_recalc = 1;
}
new_ls.id.a_obj = dest;
sources.unshift(new_ls); // prepend
dest.lamplit = 1;
return;
}
}
}
// ── obj_merge_light_sources ──
// C ref: light.c:808
export function obj_merge_light_sources(src, dest) {
if (src !== dest)
end_burn(src, true);
const sources = get_light_base();
for (const ls of sources) {
if (ls.type === LS_OBJECT && ls.id.a_obj === dest) {
ls.range = candle_light_range(dest);
game.vision_full_recalc = 1;
break;
}
}
}
// ── obj_adjust_light_radius ──
// C ref: light.c:825
export function obj_adjust_light_radius(obj, new_radius) {
const sources = get_light_base();
for (const ls of sources) {
if (ls.type === LS_OBJECT && ls.id.a_obj === obj) {
if (new_radius !== ls.range)
game.vision_full_recalc = 1;
ls.range = new_radius;
return;
}
}
impossible(`obj_adjust_light_radius: can't find ${xname(obj)}`);
}
// ── candle_light_range ──
// C ref: light.c:843
export function candle_light_range(obj) {
let radius;
if (obj.otyp === CANDELABRUM_OF_INVOCATION) {
radius = (obj.spe < 4) ? 2 : (obj.spe < 7) ? 3 : 4;
} else if (Is_candle(obj)) {
const n = obj.quan;
radius = 1;
while (radius * radius <= n && radius < MAX_RADIUS) {
radius++;
}
} else {
radius = 3; // lamp's value
}
return radius;
}
// ── artifact_light ──
// C ref: artifact.c:2264
export function artifact_light(obj) {
if (!obj) return false;
// Gold dragon scale mail / scales when worn as armor
if ((obj.otyp === GOLD_DRAGON_SCALE_MAIL || obj.otyp === GOLD_DRAGON_SCALES)
&& (obj.owornmask & W_ARM) !== 0)
return true;
// Sunsword
return is_art(obj, ART_SUNSWORD);
}
// ── arti_light_radius ──
// C ref: light.c:881
export function arti_light_radius(obj) {
if (!obj.lamplit || !artifact_light(obj))
return 0;
let res = obj.blessed ? 3 : !obj.cursed ? 2 : 1;
// uskin: poly'd into gold dragon with embedded scales
if (obj === game.u?.uskin)
res = 1;
else if (obj.otyp === GOLD_DRAGON_SCALE_MAIL)
++res;
return res;
}
// ── arti_light_description ──
// C ref: light.c:916
export function arti_light_description(obj) {
switch (arti_light_radius(obj)) {
case 4: return 'radiantly';
case 3: return 'brilliantly';
case 2: return 'brightly';
case 1: return 'dimly';
default: break;
}
return 'strangely';
}
// ── begin_burn ──
// C ref: timeout.c:1712
export function begin_burn(obj, already_lit) {
let radius = 3;
let turns = 0;
let do_timer = true;
if (obj.age === 0 && obj.otyp !== MAGIC_LAMP && !artifact_light(obj))
return;
switch (obj.otyp) {
case MAGIC_LAMP:
obj.lamplit = 1;
do_timer = false;
break;
case POT_OIL:
turns = obj.age;
if (obj.odiluted)
turns = Math.trunc((3 * turns + 2) / 4);
radius = 1;
break;
case BRASS_LANTERN:
case OIL_LAMP:
if (obj.age > 150)
turns = obj.age - 150;
else if (obj.age > 100)
turns = obj.age - 100;
else if (obj.age > 50)
turns = obj.age - 50;
else if (obj.age > 25)
turns = obj.age - 25;
else
turns = obj.age;
break;
case CANDELABRUM_OF_INVOCATION:
case TALLOW_CANDLE:
case WAX_CANDLE:
if (obj.age > 75)
turns = obj.age - 75;
else if (obj.age > 15)
turns = obj.age - 15;
else
turns = obj.age;
radius = candle_light_range(obj);
break;
default:
if (artifact_light(obj)) {
obj.lamplit = 1;
do_timer = false;
radius = arti_light_radius(obj);
} else {
impossible(`begin burn: unexpected ${xname(obj)}`);
turns = obj.age;
}
break;
}
if (do_timer) {
if (start_timer(turns, TIMER_OBJECT, BURN_OBJECT, obj_to_any(obj))) {
obj.lamplit = 1;
obj.age -= turns;
if (carried(obj) && !already_lit)
update_inventory();
} else {
obj.lamplit = 0;
}
} else {
if (carried(obj) && !already_lit)
update_inventory();
}
if (obj.lamplit && !already_lit) {
const loc = get_obj_location(obj, CONTAINED_TOO | BURIED_TOO);
if (loc)
new_light_source(loc.x, loc.y, radius, LS_OBJECT, obj_to_any(obj));
else
impossible("begin_burn: can't get obj position");
}
}
// ── end_burn ──
// C ref: timeout.c:1803
export function end_burn(obj, timer_attached) {
if (!obj.lamplit) {
impossible(`end_burn: obj ${xname(obj)} not lit`);
return;
}
if (obj.otyp === MAGIC_LAMP || artifact_light(obj))
timer_attached = false;
if (!timer_attached) {
del_light_source(LS_OBJECT, obj_to_any(obj));
obj.lamplit = 0;
if (obj.where === OBJ_INVENT)
update_inventory();
} else if (!stop_timer(BURN_OBJECT, obj_to_any(obj))) {
impossible(`end_burn: obj ${xname(obj)} not timed!`);
}
}
// ── discard_flashes ──
// C ref: light.c:361
function discard_flashes() {
const sources = get_light_base();
for (let i = sources.length - 1; i >= 0; i--) {
if (sources[i].type === LS_OBJECT && !sources[i].id.a_obj) {
sources.splice(i, 1);
game.vision_full_recalc = 1;
}
}
}
// ── find_mid ──
// C ref: light.c:376
export function find_mid(nid, fmflags) {
if ((fmflags & FM_YOU) && nid === 1)
return game.youmonst;
if (fmflags & FM_FMON)
for (let mtmp = game.fmon; mtmp; mtmp = mtmp.nmon)
if (!mtmp.mhp || mtmp.mhp > 0) // !DEADMONSTER
if (mtmp.m_id === nid) return mtmp;
if (fmflags & FM_MIGRATE)
for (let mtmp = game.migrating_mons; mtmp; mtmp = mtmp.nmon)
if (mtmp.m_id === nid) return mtmp;
if (fmflags & FM_MYDOGS)
for (let mtmp = game.mydogs; mtmp; mtmp = mtmp.nmon)
if (mtmp.m_id === nid) return mtmp;
return null;
}
// ── show_transient_light ──
// C ref: light.c:257 — stub
export function show_transient_light(obj, x, y) {
// TODO: full implementation requires vision_recalc, place_object, etc.
}
// ── transient_light_cleanup ──
// C ref: light.c:330 — stub
export function transient_light_cleanup() {
discard_flashes();
// TODO: full implementation
}
// ── wiz_light_sources ──
// C ref: light.c:936
export function wiz_light_sources() {
// TODO: requires create_nhwindow/putstr/display_nhwindow
const sources = get_light_base();
if (sources.length > 0) {
for (const ls of sources) {
const typeStr = ls.type === LS_OBJECT ? 'obj'
: ls.type === LS_MONSTER
? (mon_is_local(ls.id.a_monst) ? 'mon'
: (ls.id.a_monst === game.youmonst) ? 'you' : '<m>')
: '???';
// Would putstr to window; stubbed for now
}
}
return 0; // ECMD_OK
}
// ── emits_light ──
// C ref: mondata.h — some monsters glow
export function emits_light(ptr) {
if (!ptr) return 0;
if (ptr.mname === 'fire elemental' || ptr.mname === 'flaming sphere')
return 1;
return 0;
}
// ── Legacy alias ──
export function obj_shines_on(obj) {
return obj_sheds_light(obj);
}
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