source_of_the_sovereign/src/overworld/overworld.c

/****************************************************************************
 * Copyright (C) 2015-2016 by the SotS Team                                 *
 *                                                                          *
 * This file is part of Sovereign of the Skies.                             *
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 *   Sovereign of the Skies is free software: you can redistribute it       *
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 *   licence and this header.                                               *
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 *   Sovereign of the Skies is distributed in the hope that it will be      *
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 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
 *   GNU Lesser General Public License for more details.                    *
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 *   You should have received a copy of the GNU Lesser General Public       *
 *   License along with Sovereign of the Skies.                             *
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/**
 * @file overworld.c
 * @author Sturmvogel
 * @date 15 dec 2016
 * @brief Routines to work with the new overworld npc table
 */

/* === INCLUDES === */
#include <game_engine.h>
#include <npc.h>

/* === DEFINES === */
#define OW_REPLACE_VAR 0x500A
#define OW_REPLACE_TO_VAR 0x500B

/* === PROTOTYPES === */
/**
 * @brief get the npc type struct by given 16 bit npc id
 * @param npc_id short npc id
 * @return pointer to corresponding npc_type structure
 */
struct npc_type *npc_get_type(u16 npc_id);

/* === EXTERN STATICS ===*/
struct npc_type **ow_main_table;
struct npc_type **ow_second_table;
struct npc_type **ow_third_table;

/* === IMPLEMENTATIONS === */
struct npc_type *npc_get_type(u16 npc_id)
{

    /* Not possible in a global scope because of gcc cow magic */
    struct npc_type **npc_tables[3] = {ow_main_table, ow_second_table, ow_third_table};
    //struct npc_type** npc_tables[] = {ow_main_table, ow_second_table, ow_third_table};
    u8 table_id = npc_id >> 8;
    if (table_id > 2)
        npc_id = (u8)npc_id;

    u16 replace_ow = var_get(OW_REPLACE_VAR);
    if (replace_ow > 0 && replace_ow - 1 == npc_id)
    {
        npc_id = var_get(OW_REPLACE_TO_VAR);
    }
    u8 table = (npc_id >> 8);
    return (npc_tables[table][npc_id & 0xFF]);
}