TombEngine/TR5Main/Objects/TR4/Entity/tr4_bat.cpp

#include "framework.h"
#include "tr4_bat.h"
#include "box.h"
#include "control.h"
#include "effect2.h"
#include "misc.h"
#include "lara.h"
#include "lot.h"
#include "setup.h"
#include "trmath.h"

namespace TEN::Entities::TR4
{
    enum BAT_STATE
    {
        STATE_BAT_EMPTY,
        STATE_BAT_START,
        STATE_BAT_FLY,
        STATE_BAT_ATK,
        STATE_BAT_FALLING,
        STATE_BAT_DEATH,
        STATE_BAT_IDLE
    };

#define BAT_ANGLE ANGLE(20.0f)
    constexpr auto BAT_ANIM_FALLING = 3;
    constexpr auto BAT_ANIM_IDLE = 5;
    constexpr auto BAT_ATTACK_RANGE = SQUARE(CLICK(1));
    constexpr auto BAT_TARGETING_RANGE = SQUARE(SECTOR(5));
    constexpr auto BAT_TARGET_YPOS = 896;
    constexpr auto BAT_DAMAGE = 2;
    static BITE_INFO batBite(0, 16, 45, 4);

    static bool isBatCollideTarget(ITEM_INFO* item)
    {
        return item->touchBits >= 0;
    }

    void InitialiseBat(short itemNumber)
    {
        ITEM_INFO* item = &g_Level.Items[itemNumber];

        InitialiseCreature(itemNumber);

        item->animNumber = Objects[item->objectNumber].animIndex + BAT_ANIM_IDLE;
        item->frameNumber = g_Level.Anims[item->animNumber].frameBase;
        item->goalAnimState = STATE_BAT_IDLE;
        item->currentAnimState = STATE_BAT_IDLE;
    }

    void BatControl(short itemNumber)
    {
        if (!CreatureActive(itemNumber))
            return;

        ITEM_INFO* item, * target;
        CREATURE_INFO* bat, * slots;
        AI_INFO info;
        int distance, bestdistance;
        short angle;

        item = &g_Level.Items[itemNumber];
        bat = GetCreatureInfo(item);
        angle = 0;

        if (item->hitPoints > 0)
        {
            if (item->aiBits)
            {
                GetAITarget(bat);
            }
            else
            {
                bat->enemy = LaraItem;

                // NOTE: it seems weird, bat could target any enemy including dogs for example

                // check if voncroy are in range !
                // take in account that the bat will always target voncroy if he exist and triggered !
                // the bat will ignore lara completly !
                /*bestdistance = MAXINT;
                bat->enemy = LaraItem;

                slots = &BaddieSlots[0];
                for (int i = 0; i < NUM_SLOTS; i++, slots++)
                {
                    if (slots->itemNum != NO_ITEM && slots->itemNum != itemNumber)
                    {
                        target = &g_Level.Items[slots->itemNum];
                        if (target->objectNumber == ID_VON_CROY)
                        {
                            int x, z;
                            x = target->pos.xPos - item->pos.xPos;
                            z = target->pos.zPos - item->pos.zPos;
                            distance = SQUARE(x) + SQUARE(z);
                            if (distance < bestdistance)
                            {
                                bat->enemy = target;
                                bestdistance = distance;
                            }
                        }
                    }
                }*/
            }

            // NOTE: chaned from TIMID to VIOLENT, otherwise the bat seems to ignore Lara. 
            // Personally, i feel fine with bat always VIOLENT, but I will inspect also GetCreatureMood and CreatureMood functions
            // for bugs.

            CreatureAIInfo(item, &info);
            GetCreatureMood(item, &info, VIOLENT);

            if (bat->flags)
                bat->mood = ESCAPE_MOOD;

            CreatureMood(item, &info, VIOLENT);

            angle = CreatureTurn(item, BAT_ANGLE);

            switch (item->currentAnimState)
            {
            case STATE_BAT_IDLE:
                if (info.distance < BAT_TARGETING_RANGE
                    || item->hitStatus
                    || bat->hurtByLara)
                    item->goalAnimState = STATE_BAT_START;
                break;

            case STATE_BAT_FLY:
                if (info.distance < BAT_ATTACK_RANGE || !(GetRandomControl() & 0x3F))
                    bat->flags = 0;

                if (!bat->flags)
                {
                    if (item->touchBits
                        || bat->enemy != LaraItem
                        && info.distance < BAT_ATTACK_RANGE
                        && info.ahead
                        && abs(item->pos.yPos - bat->enemy->pos.yPos) < BAT_TARGET_YPOS)
                    {
                        item->goalAnimState = STATE_BAT_ATK;
                    }
                }
                break;

            case STATE_BAT_ATK:
                if (!bat->flags
                    && (item->touchBits
                        || bat->enemy != LaraItem)
                    && info.distance < BAT_ATTACK_RANGE
                    && info.ahead &&
                    abs(item->pos.yPos - bat->enemy->pos.yPos) < BAT_TARGET_YPOS)
                {
                    CreatureEffect(item, &batBite, DoBloodSplat);
                    if (bat->enemy == LaraItem)
                    {
                        LaraItem->hitPoints -= BAT_DAMAGE;
                        LaraItem->hitStatus = true;
                    }
                    bat->flags = 1;
                }
                else
                {
                    item->goalAnimState = STATE_BAT_FLY;
                    bat->mood = BORED_MOOD;
                }
                break;
            }
        }
        else if (item->currentAnimState == STATE_BAT_ATK)
        {
            item->animNumber = Objects[item->objectNumber].animIndex + 1;
            item->frameNumber = g_Level.Anims[item->animNumber].frameBase;
            item->goalAnimState = STATE_BAT_FLY;
            item->currentAnimState = STATE_BAT_FLY;
        }
        else
        {
            if (item->pos.yPos >= item->floor)
            {
                item->goalAnimState = STATE_BAT_DEATH;
                item->pos.yPos = item->floor;
                item->gravityStatus = false;
            }
            else
            {
                item->gravityStatus = true;
                item->animNumber = Objects[item->objectNumber].animIndex + BAT_ANIM_FALLING;
                item->frameNumber = g_Level.Anims[item->animNumber].frameBase;
                item->goalAnimState = STATE_BAT_FALLING;
                item->currentAnimState = STATE_BAT_FALLING;
                item->speed = 0;
            }
        }

        CreatureAnimation(itemNumber, angle, 0);
    }
}