richk@6720: /* $Id$ */
richk@6720: 
richk@6720: /** @file newgrf_townname.cpp
richk@6720:  * Implementation of  Action 0F "universal holder" structure and functions.
richk@6720:  * This file implements a linked-lists of townname generators,
richk@6720:  * holding everything that the newgrf action 0F will send over to OpenTTD.
richk@6720:  */
richk@6720: 
richk@6720: #include "stdafx.h"
richk@6720: #include "openttd.h"
richk@6720: #include "table/strings.h"
richk@6720: #include "newgrf_townname.h"
richk@6720: #include "string.h"
richk@6720: 
richk@6720: static GRFTownName *_grf_townnames = NULL;
richk@6720: 
richk@6720: GRFTownName *GetGRFTownName(uint32 grfid)
richk@6720: {
richk@6720: 	GRFTownName *t = _grf_townnames;
richk@6720: 	for (; t != NULL; t = t->next) {
richk@6720: 		if (t->grfid == grfid) return t;
richk@6720: 	}
richk@6720: 	return NULL;
richk@6720: }
richk@6720: 
richk@6720: GRFTownName *AddGRFTownName(uint32 grfid)
richk@6720: {
richk@6720: 	GRFTownName *t = GetGRFTownName(grfid);
richk@6720: 	if (t == NULL) {
richk@6720: 		t = CallocT<GRFTownName>(1);
richk@6720: 		t->grfid = grfid;
richk@6720: 		t->next = _grf_townnames;
richk@6720: 		_grf_townnames = t;
richk@6720: 	}
richk@6720: 	return t;
richk@6720: }
richk@6720: 
richk@6720: void DelGRFTownName(uint32 grfid)
richk@6720: {
richk@6720: 	GRFTownName *t = _grf_townnames;
richk@6720: 	GRFTownName *p = NULL;
richk@6720: 	for (;t != NULL; p = t, t = t->next) if (t->grfid == grfid) break;
richk@6720: 	if (t != NULL) {
richk@6720: 		for (int i = 0; i < 128; i++) {
richk@6720: 			for (int j = 0; j < t->nbparts[i]; j++) {
richk@6720: 				for (int k = 0; k < t->partlist[i][j].partcount; k++) {
richk@6720: 					if (!HASBIT(t->partlist[i][j].parts[k].prob, 7)) free(t->partlist[i][j].parts[k].data.text);
richk@6720: 				}
richk@6720: 				free(t->partlist[i][j].parts);
richk@6720: 			}
richk@6720: 			free(t->partlist[i]);
richk@6720: 		}
richk@6720: 		if (p != NULL) {
richk@6720: 			p->next = t->next;
richk@6720: 		} else {
richk@6720: 			_grf_townnames = t->next;
richk@6720: 		}
richk@6720: 		free(t);
richk@6720: 	}
richk@6720: }
richk@6720: 
richk@6720: static char *RandomPart(char *buf, GRFTownName *t, uint32 seed, byte id, const char *last)
richk@6720: {
richk@6720: 	assert(t != NULL);
richk@6720: 	for (int i = 0; i < t->nbparts[id]; i++) {
richk@6720: 		byte count = t->partlist[id][i].bitcount;
richk@6720: 		uint16 maxprob = t->partlist[id][i].maxprob;
richk@6720: 		uint32 r = (GB(seed, t->partlist[id][i].bitstart, count) * maxprob) >> count;
richk@6720: 		for (int j = 0; j < t->partlist[id][i].partcount; j++) {
richk@6720: 			byte prob = t->partlist[id][i].parts[j].prob;
richk@6720: 			maxprob -= GB(prob, 0, 7);
richk@6720: 			if (maxprob > r) continue;
richk@6720: 			if (HASBIT(prob, 7)) {
richk@6720: 				buf = RandomPart(buf, t, seed, t->partlist[id][i].parts[j].data.id, last);
richk@6720: 			} else {
richk@6720: 				buf = strecat(buf, t->partlist[id][i].parts[j].data.text, last);
richk@6720: 			}
richk@6720: 			break;
richk@6720: 		}
richk@6720: 	}
richk@6720: 	return buf;
richk@6720: }
richk@6720: 
richk@6720: char *GRFTownNameGenerate(char *buf, uint32 grfid, uint16 gen, uint32 seed, const char *last)
richk@6720: {
richk@6720: 	strecpy(buf, "", last);
richk@6720: 	for (GRFTownName *t = _grf_townnames; t != NULL; t = t->next) {
richk@6720: 		if (t->grfid == grfid) {
richk@6720: 			assert(gen < t->nb_gen);
richk@6720: 			buf = RandomPart(buf, t, seed, t->id[gen], last);
richk@6720: 			break;
richk@6720: 		}
richk@6720: 	}
richk@6720: 	return buf;
richk@6720: }
richk@6720: 
richk@6720: StringID *GetGRFTownNameList()
richk@6720: {
richk@6720: 	int nb_names = 0, n = 0;
richk@6720: 	for (GRFTownName *t = _grf_townnames; t != NULL; t = t->next) nb_names += t->nb_gen;
richk@6720: 	StringID *list = MallocT<StringID>(nb_names + 1);
richk@6720: 	for (GRFTownName *t = _grf_townnames; t != NULL; t = t->next) {
richk@6720: 		for (int j = 0; j < t->nb_gen; j++) list[n++] = t->name[j];
richk@6720: 	}
richk@6720: 	list[n] = INVALID_STRING_ID;
richk@6720: 	return list;
richk@6720: }
richk@6720: 
richk@6720: void CleanUpGRFTownNames()
richk@6720: {
richk@6720: 	while (_grf_townnames != NULL) DelGRFTownName(_grf_townnames->grfid);
richk@6720: }
richk@6720: 
richk@6720: uint32 GetGRFTownNameId(int gen)
richk@6720: {
richk@6720: 	for (GRFTownName *t = _grf_townnames; t != NULL; t = t->next) {
richk@6720: 		if (gen < t->nb_gen) return t->grfid;
richk@6720: 		gen -= t->nb_gen;
richk@6720: 	}
richk@6720: 	/* Fallback to no NewGRF */
richk@6720: 	return 0;
richk@6720: }
richk@6720: 
richk@6720: uint16 GetGRFTownNameType(int gen)
richk@6720: {
richk@6720: 	for (GRFTownName *t = _grf_townnames; t != NULL; t = t->next) {
richk@6720: 		if (gen < t->nb_gen) return gen;
richk@6720: 		gen -= t->nb_gen;
richk@6720: 	}
richk@6720: 	/* Fallback to english original */
richk@6720: 	return SPECSTR_TOWNNAME_ENGLISH;
richk@6720: }