raze/source/games/blood/src/aihound.cpp

//-------------------------------------------------------------------------
/*
Copyright (C) 2010-2019 EDuke32 developers and contributors
Copyright (C) 2019 Nuke.YKT

This file is part of NBlood.

NBlood is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License version 2
as published by the Free Software Foundation.

This program 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/
//-------------------------------------------------------------------------

#include "ns.h"	// Must come before everything else!

#include "compat.h"
#include "build.h"

#include "blood.h"

BEGIN_BLD_NS

static void houndThinkSearch(DBloodActor *);
static void houndThinkGoto(DBloodActor *);
static void houndThinkChase(DBloodActor *);

AISTATE houndIdle = { kAiStateIdle, 0, -1, 0, NULL, NULL, aiThinkTarget, NULL };
AISTATE houndSearch = { kAiStateMove, 8, -1, 1800, NULL, aiMoveForward, houndThinkSearch, &houndIdle };
AISTATE houndChase = { kAiStateChase, 8, -1, 0, NULL, aiMoveForward, houndThinkChase, NULL };
AISTATE houndRecoil = { kAiStateRecoil, 5, -1, 0, NULL, NULL, NULL, &houndSearch };
AISTATE houndTeslaRecoil = { kAiStateRecoil, 4, -1, 0, NULL, NULL, NULL, &houndSearch };
AISTATE houndGoto = { kAiStateMove, 8, -1, 600, NULL, aiMoveForward, houndThinkGoto, &houndIdle };
AISTATE houndBite = { kAiStateChase, 6, nHoundBiteClient, 60, NULL, NULL, NULL, &houndChase };
AISTATE houndBurn = { kAiStateChase, 7, nHoundBurnClient, 60, NULL, NULL, NULL, &houndChase };

void houndBiteSeqCallback(int, DBloodActor* actor)
{
    XSPRITE* pXSprite = &actor->x();
    spritetype* pSprite = &actor->s();
    int dx = CosScale16(pSprite->ang);
    int dy = SinScale16(pSprite->ang);
    ///assert(pSprite->type >= kDudeBase && pSprite->type < kDudeMax);
    if (!(pSprite->type >= kDudeBase && pSprite->type < kDudeMax)) {
        Printf(PRINT_HIGH, "pSprite->type >= kDudeBase && pSprite->type < kDudeMax");
        return;
    }

    ///assert(pXSprite->target_i >= 0 && pXSprite->target_i < kMaxSprites);
    if (!(pXSprite->target_i >= 0 && pXSprite->target_i < kMaxSprites)) {
        Printf(PRINT_HIGH, "pXSprite->target_i >= 0 && pXSprite->target_i < kMaxSprites");
        return;
    }
    spritetype *pTarget = &sprite[pXSprite->target_i];
    #ifdef NOONE_EXTENSIONS
        if (IsPlayerSprite(pTarget) || gModernMap) // allow to hit non-player targets
            actFireVector(actor, 0, 0, dx, dy, pTarget->z - pSprite->z, kVectorHoundBite);
    #else
        if (IsPlayerSprite(pTarget))
            actFireVector(actor, 0, 0, dx, dy, pTarget->z - pSprite->z, kVectorHoundBite);
    #endif
}

void houndBurnSeqCallback(int, DBloodActor* actor)
{
    spritetype* pSprite = &actor->s();
    actFireMissile(pSprite, 0, 0, CosScale16(pSprite->ang), SinScale16(pSprite->ang), 0, kMissileFlameHound);
}

static void houndThinkSearch(DBloodActor* actor)
{
    auto pXSprite = &actor->x();
    auto pSprite = &actor->s();
    aiChooseDirection(actor,pXSprite->goalAng);
    aiThinkTarget(actor);
}

static void houndThinkGoto(DBloodActor* actor)
{
    auto pXSprite = &actor->x();
    auto pSprite = &actor->s();
    ///assert(pSprite->type >= kDudeBase && pSprite->type < kDudeMax);
    if (!(pSprite->type >= kDudeBase && pSprite->type < kDudeMax)) {
        Printf(PRINT_HIGH, "pSprite->type >= kDudeBase && pSprite->type < kDudeMax");
        return;
    }
    
    DUDEINFO *pDudeInfo = getDudeInfo(pSprite->type);
    int dx = pXSprite->targetX-pSprite->x;
    int dy = pXSprite->targetY-pSprite->y;
    int nAngle = getangle(dx, dy);
    int nDist = approxDist(dx, dy);
    aiChooseDirection(actor,nAngle);
    if (nDist < 512 && abs(pSprite->ang - nAngle) < pDudeInfo->periphery)
        aiNewState(actor, &houndSearch);
    aiThinkTarget(actor);
}

static void houndThinkChase(DBloodActor* actor)
{
    auto pXSprite = &actor->x();
    auto pSprite = &actor->s();
    if (actor->GetTarget() == nullptr)
    {
        aiNewState(actor, &houndGoto);
        return;
    }
    ///assert(pSprite->type >= kDudeBase && pSprite->type < kDudeMax);
    if (!(pSprite->type >= kDudeBase && pSprite->type < kDudeMax)) {
        Printf(PRINT_HIGH, "pSprite->type >= kDudeBase && pSprite->type < kDudeMax");
        return;
    }
    DUDEINFO *pDudeInfo = getDudeInfo(pSprite->type);
    ///assert(pXSprite->target_i >= 0 && pXSprite->target_i < kMaxSprites);
    if (!(pXSprite->target_i >= 0 && pXSprite->target_i < kMaxSprites)) {
        Printf(PRINT_HIGH, "pXSprite->target_i >= 0 && pXSprite->target_i < kMaxSprites");
        return;
    }
    spritetype *pTarget = &sprite[pXSprite->target_i];
    XSPRITE *pXTarget = &xsprite[pTarget->extra];
    int dx = pTarget->x-pSprite->x;
    int dy = pTarget->y-pSprite->y;
    aiChooseDirection(actor,getangle(dx, dy));
    if (pXTarget->health == 0)
    {
        aiNewState(actor, &houndSearch);
        return;
    }
    if (IsPlayerSprite(pTarget) && powerupCheck(&gPlayer[pTarget->type-kDudePlayer1], kPwUpShadowCloak) > 0)
    {
        aiNewState(actor, &houndSearch);
        return;
    }
    int nDist = approxDist(dx, dy);
    if (nDist <= pDudeInfo->seeDist)
    {
        int nDeltaAngle = ((getangle(dx,dy)+1024-pSprite->ang)&2047)-1024;
        int height = (pDudeInfo->eyeHeight*pSprite->yrepeat)<<2;
        if (cansee(pTarget->x, pTarget->y, pTarget->z, pTarget->sectnum, pSprite->x, pSprite->y, pSprite->z - height, pSprite->sectnum))
        {
            if (nDist < pDudeInfo->seeDist && abs(nDeltaAngle) <= pDudeInfo->periphery)
            {
                aiSetTarget(actor, actor->GetTarget());
                if (nDist < 0xb00 && nDist > 0x500 && abs(nDeltaAngle) < 85)
                    aiNewState(actor, &houndBurn);
                else if(nDist < 0x266 && abs(nDeltaAngle) < 85)
                    aiNewState(actor, &houndBite);
                return;
            }
        }
    }

    aiNewState(actor, &houndGoto);
    actor->SetTarget(nullptr);
}

END_BLD_NS