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218 lines
6.7 KiB
C++
218 lines
6.7 KiB
C++
/*
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** a_randomspawner.cpp
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** A thing that randomly spawns one item in a list of many, before disappearing.
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** bouncecount is used to keep track of recursions (so as to prevent infinite loops).
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** Species is used to store the index of the spawned actor's name.
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*/
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#include "actor.h"
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#include "info.h"
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#include "m_random.h"
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#include "p_local.h"
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#include "p_enemy.h"
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#include "s_sound.h"
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#include "statnums.h"
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#include "gstrings.h"
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#include "a_action.h"
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#include "thingdef/thingdef.h"
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#define MAX_RANDOMSPAWNERS_RECURSION 32 // Should be largely more than enough, honestly.
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static FRandom pr_randomspawn("RandomSpawn");
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class ARandomSpawner : public AActor
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{
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DECLARE_CLASS (ARandomSpawner, AActor)
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// To handle "RandomSpawning" missiles, the code has to be split in two parts.
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// If the following code is not done in BeginPlay, missiles will use the
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// random spawner's velocity (0...) instead of their own.
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void BeginPlay()
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{
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DDropItem *di; // di will be our drop item list iterator
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DDropItem *drop; // while drop stays as the reference point.
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int n = 0;
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bool nomonsters = (dmflags & DF_NO_MONSTERS) || (level.flags2 & LEVEL2_NOMONSTERS);
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Super::BeginPlay();
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drop = di = GetDropItems();
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if (di != NULL)
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{
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while (di != NULL)
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{
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if (di->Name != NAME_None)
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{
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if (!nomonsters || !(GetDefaultByType(PClass::FindClass(di->Name))->flags3 & MF3_ISMONSTER))
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{
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if (di->Amount < 0) di->Amount = 1; // default value is -1, we need a positive value.
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n += di->Amount; // this is how we can weight the list.
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}
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di = di->Next;
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}
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}
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if (n == 0)
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{ // Nothing left to spawn. They must have all been monsters, and monsters are disabled.
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Destroy();
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return;
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}
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// Then we reset the iterator to the start position...
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di = drop;
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// Take a random number...
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n = pr_randomspawn(n);
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// And iterate in the array up to the random number chosen.
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while (n > -1 && di != NULL)
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{
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if (di->Name != NAME_None &&
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(!nomonsters || !(GetDefaultByType(PClass::FindClass(di->Name))->flags3 & MF3_ISMONSTER)))
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{
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n -= di->Amount;
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if ((di->Next != NULL) && (n > -1))
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di = di->Next;
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else
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n = -1;
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}
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else
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{
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di = di->Next;
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}
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}
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// So now we can spawn the dropped item.
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if (di == NULL || bouncecount >= MAX_RANDOMSPAWNERS_RECURSION) // Prevents infinite recursions
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{
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Spawn("Unknown", x, y, z, NO_REPLACE); // Show that there's a problem.
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Destroy();
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return;
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}
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else if (pr_randomspawn() <= di->Probability) // prob 255 = always spawn, prob 0 = almost never spawn.
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{
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// Handle replacement here so as to get the proper speed and flags for missiles
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PClassActor *cls;
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cls = PClass::FindActor(di->Name);
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if (cls != NULL)
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{
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PClassActor *rep = cls->GetReplacement();
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if (rep != NULL)
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{
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cls = rep;
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}
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}
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if (cls != NULL)
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{
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Species = cls->TypeName;
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AActor *defmobj = GetDefaultByType(cls);
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this->Speed = defmobj->Speed;
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this->flags |= (defmobj->flags & MF_MISSILE);
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this->flags2 |= (defmobj->flags2 & MF2_SEEKERMISSILE);
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this->flags4 |= (defmobj->flags4 & MF4_SPECTRAL);
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}
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else
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{
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Species = NAME_None;
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}
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}
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}
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}
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// The second half of random spawning. Now that the spawner is initialized, the
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// real actor can be created. If the following code were in BeginPlay instead,
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// missiles would not have yet obtained certain information that is absolutely
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// necessary to them -- such as their source and destination.
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void PostBeginPlay()
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{
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Super::PostBeginPlay();
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AActor *newmobj = NULL;
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bool boss = false;
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if (Species == NAME_None)
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{
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Destroy();
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return;
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}
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PClassActor *cls = PClass::FindActor(Species);
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if (this->flags & MF_MISSILE && target && target->target) // Attempting to spawn a missile.
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{
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if ((tracer == NULL) && (flags2 & MF2_SEEKERMISSILE))
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{
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tracer = target->target;
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}
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newmobj = P_SpawnMissileXYZ(x, y, z, target, target->target, cls, false);
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}
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else
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{
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newmobj = Spawn(cls, x, y, z, NO_REPLACE);
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}
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if (newmobj != NULL)
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{
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// copy everything relevant
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newmobj->SpawnAngle = newmobj->angle = angle;
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newmobj->SpawnPoint[2] = SpawnPoint[2];
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newmobj->special = special;
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newmobj->args[0] = args[0];
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newmobj->args[1] = args[1];
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newmobj->args[2] = args[2];
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newmobj->args[3] = args[3];
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newmobj->args[4] = args[4];
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newmobj->special1 = special1;
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newmobj->special2 = special2;
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newmobj->SpawnFlags = SpawnFlags;
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newmobj->HandleSpawnFlags();
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newmobj->tid = tid;
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newmobj->AddToHash();
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newmobj->velx = velx;
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newmobj->vely = vely;
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newmobj->velz = velz;
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newmobj->master = master; // For things such as DamageMaster/DamageChildren, transfer mastery.
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newmobj->target = target;
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newmobj->tracer = tracer;
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newmobj->CopyFriendliness(this, false);
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// This handles things such as projectiles with the MF4_SPECTRAL flag that have
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// a health set to -2 after spawning, for internal reasons.
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if (health != SpawnHealth()) newmobj->health = health;
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if (!(flags & MF_DROPPED)) newmobj->flags &= ~MF_DROPPED;
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// Handle special altitude flags
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if (newmobj->flags & MF_SPAWNCEILING)
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{
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newmobj->z = newmobj->ceilingz - newmobj->height - SpawnPoint[2];
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}
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else if (newmobj->flags2 & MF2_SPAWNFLOAT)
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{
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fixed_t space = newmobj->ceilingz - newmobj->height - newmobj->floorz;
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if (space > 48*FRACUNIT)
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{
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space -= 40*FRACUNIT;
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newmobj->z = MulScale8 (space, pr_randomspawn()) + newmobj->floorz + 40*FRACUNIT;
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}
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newmobj->z += SpawnPoint[2];
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}
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if (newmobj->flags & MF_MISSILE)
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P_CheckMissileSpawn(newmobj, 0);
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// Bouncecount is used to count how many recursions we're in.
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if (newmobj->IsKindOf(PClass::FindClass("RandomSpawner")))
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newmobj->bouncecount = ++bouncecount;
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// If the spawned actor has either of those flags, it's a boss.
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if ((newmobj->flags4 & MF4_BOSSDEATH) || (newmobj->flags2 & MF2_BOSS))
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boss = true;
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// If a replaced actor has either of those same flags, it's also a boss.
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AActor *rep = GetDefaultByType(GetClass()->GetReplacee());
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if (rep && ((rep->flags4 & MF4_BOSSDEATH) || (rep->flags2 & MF2_BOSS)))
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boss = true;
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}
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if (boss)
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this->tracer = newmobj;
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else // "else" because a boss-replacing spawner must wait until it can call A_BossDeath.
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Destroy();
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}
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void Tick() // This function is needed for handling boss replacers
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{
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Super::Tick();
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if (tracer == NULL || tracer->health <= 0)
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{
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A_BossDeath(this);
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Destroy();
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}
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}
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};
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IMPLEMENT_CLASS (ARandomSpawner)
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