source_of_the_sovereign/src/savefile/flag_manipulation.c

/****************************************************************************
 * Copyright (C) 2015-2017 by the SotS Team                                 *
 *                                                                          *
 * This file is part of Sovereign of the Skies.                             *
 *                                                                          *
 *   Sovereign of the Skies is free software: you can redistribute it       *
 *   and/or modify it                                                       *
 *   under the terms of the GNU Lesser General Public License as published  *
 *   by the Free Software Foundation, either version 3 of the License, or   *
 *   (at your option) any later version provided you include a copy of the  *
 *   licence and this header.                                               *
 *                                                                          *
 *   Sovereign of the Skies is distributed in the hope that it will be      *
 *   useful, but WITHOUT ANY WARRANTY; without even the implied warranty of *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
 *   GNU Lesser General Public License for more details.                    *
 *                                                                          *
 *   You should have received a copy of the GNU Lesser General Public       *
 *   License along with Sovereign of the Skies.                             *
 *   If not, see <http://www.gnu.org/licenses/>.                            *
 ****************************************************************************/

/**
* @file flag_manipulation.c
* @author Sturmvogel
* @date 25 may 2017
* @brief functions for preserving flags and reusing difficulty
*/
#include <pokeagb/pokeagb.h>

#include <agb_debug.h>

#define TRAINER_FLAG_SPACE_START 0x1000

extern u16 tb_modify_flag_id(u16 flag_id);
u16 trainerflag_fix_difficulty(u16 flag_id);

u16 load_hword(void *ptr) {
    u8 *to_load = (u8 *)ptr;
    u16 result = *to_load;
    u16 result2 = *(to_load + 1) << 8;
    return result | result2;
}

u8 load_byte(void *ptr) { return (u8)(*((u8 *)ptr)); }

u16 trainerflag_fix_difficulty(u16 flag_id) {
    u16 new_flag = ((flag_id - TRAINER_FLAG_SPACE_START + 1) / 3) + TRAINER_FLAG_SPACE_START;
    dprintf("trainerflag_fix_difficulty;; flag_id: 0x%x, reduced: 0x%x, status: %s\n", flag_id, new_flag,
            flag_check(new_flag) ? "true" : "false");
    return new_flag;
}

bool trainer_check_flag_on_spot(u8 npc_id) {
    void *script = npc_get_script_by_npc_id(npc_id);
    /* probably inject some script execution here */

    u16 flag = tb_modify_flag_id(load_hword(script + 2));
    /* check for line of sight */

    u8 hit_result = npc_trainer_and_raycast_hit(&npc_states[npc_id]);

    if (hit_result == 0)
        return false;

    if (flag_check(trainerflag_fix_difficulty(flag + TRAINER_FLAG_SPACE_START)))
        return false;

    if ((load_byte(script + 1) == 4) && (player_cant_double_battle() > 0))
        return false;

    spot_trainer_8080334(npc_id, script);
    spot_trainer_8081E68(&npc_states[npc_id], hit_result - 1);
    return true;
}

u8 trainerflag_read_fix(void *script_location) {
    script_location += 2;
    u16 flag = load_hword(script_location);
    // dprintf("trainerflag_read_fix: 0x%x", flag);
    flag = trainerflag_fix_difficulty(flag + TRAINER_FLAG_SPACE_START);
    return flag_check(flag);
}

volatile u8 test;

u16 trainerflag_opponent_fix(void) {
    return trainerflag_fix_difficulty(trainerbattle_flag_id + TRAINER_FLAG_SPACE_START);
}

bool trainerflag_check_fix(u16 flag) { return flag_check(trainerflag_fix_difficulty(flag + TRAINER_FLAG_SPACE_START)); }

void trainerflag_set_fix(u16 flag) { flag_set(trainerflag_fix_difficulty(flag + TRAINER_FLAG_SPACE_START)); }

void trainerflag_clear_fix(u16 flag) { flag_clear(trainerflag_fix_difficulty(flag + TRAINER_FLAG_SPACE_START)); }

void flag_set_hack(u16 flag) {
    u8 *addr = flag_byte_access(flag);
    if (addr != NULL) {
        dprintf("flag 0x%x was set\n", flag);
        *addr |= 1 << (flag & 7);
    }
}

u16 var_get_hack(u16 var) {
    u16 *ptr = var_access(var);
    if (ptr != NULL)
        return *ptr;
    return var;
}

bool var_set_hack(u16 var, u16 val) {
    u16 *ptr = var_access(var);
    if (ptr != NULL) {
        dprintf("variable 0x%x was set to 0x%x (Address: 0x%x)\n", var, val, ptr);
        *ptr = val;
        return true;
    }
    return false;
}

bool var_set_script_hack(struct ScriptEnvironment *env) {
    u16 var = script_read_halfword(env);
    u16 val = script_read_halfword(env);
    var_set_hack(var, val);
    return 0;
}