summaryrefslogtreecommitdiffstats
path: root/src/Entities/Pawn.cpp
blob: a1c3a761044c6347e45d0f83dcb2de5f93ac3887 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634

#include "Globals.h"  // NOTE: MSVC stupidness requires this to be the same across all modules

#include "Pawn.h"
#include "Player.h"
#include "../BlockInfo.h"
#include "../World.h"
#include "../Bindings/PluginManager.h"
#include "../BoundingBox.h"
#include "../Blocks/BlockHandler.h"
#include "../EffectID.h"
#include "../Mobs/Monster.h"




cPawn::cPawn(eEntityType a_EntityType, float a_Width, float a_Height) :
	Super(a_EntityType, Vector3d(), a_Width, a_Height),
	m_EntityEffects(tEffectMap()),
	m_LastGroundHeight(0),
	m_bTouchGround(false)
{
	SetGravity(-32.0f);
	SetAirDrag(0.02f);
}





void cPawn::Tick(std::chrono::milliseconds a_Dt, cChunk & a_Chunk)
{
	std::vector<cEntityEffect *> EffectsToTick;

	// Iterate through this entity's applied effects
	for (tEffectMap::iterator iter = m_EntityEffects.begin(); iter != m_EntityEffects.end();)
	{
		// Copies values to prevent pesky wrong accesses and erasures
		cEntityEffect::eType EffectType = iter->first;
		cEntityEffect * Effect = iter->second.get();

		// Iterates (must be called before any possible erasure)
		++iter;

		// Remove effect if duration has elapsed
		if (Effect->GetDuration() - Effect->GetTicks() <= 0)
		{
			RemoveEntityEffect(EffectType);
		}
		// Call OnTick later to make sure the iterator won't be invalid
		else
		{
			EffectsToTick.push_back(Effect);
		}

		// TODO: Check for discrepancies between client and server effect values
	}


	for (auto * Effect : EffectsToTick)
	{
		Effect->OnTick(*this);
	}

	// Spectators cannot push entities around
	if ((!IsPlayer()) || (!static_cast<cPlayer *>(this)->IsGameModeSpectator()))
	{
		m_World->ForEachEntityInBox(GetBoundingBox(), [=](cEntity & a_Entity)
			{
				if (a_Entity.GetUniqueID() == GetUniqueID())
				{
					return false;
				}

				// we only push other mobs, boats and minecarts
				if ((a_Entity.GetEntityType() != etMonster) && (a_Entity.GetEntityType() != etMinecart) && (a_Entity.GetEntityType() != etBoat))
				{
					return false;
				}

				// do not push a boat / minecart you're sitting in
				if (IsAttachedTo(&a_Entity))
				{
					return false;
				}

				Vector3d v3Delta = a_Entity.GetPosition() - GetPosition();
				v3Delta.y = 0.0;  // we only push sideways
				v3Delta *= 1.0 / (v3Delta.Length() + 0.01);  // we push harder if we're close
				// QUESTION: is there an additional multiplier for this? current shoving seems a bit weak

				a_Entity.AddSpeed(v3Delta);
				return false;
			}
		);
	}

	Super::Tick(a_Dt, a_Chunk);
	if (!IsTicking())
	{
		// The base class tick destroyed us
		return;
	}
	HandleFalling();
}





void cPawn::KilledBy(TakeDamageInfo & a_TDI)
{
	ClearEntityEffects();

	// Is death eligible for totem reanimation?
	if (DeductTotem(a_TDI.DamageType))
	{
		m_World->BroadcastEntityAnimation(*this, EntityAnimation::PawnTotemActivates);

		AddEntityEffect(cEntityEffect::effAbsorption, 100, 1);
		AddEntityEffect(cEntityEffect::effRegeneration, 900, 1);
		AddEntityEffect(cEntityEffect::effFireResistance, 800, 0);

		m_Health = 1;
		return;
	}

	Super::KilledBy(a_TDI);
}





bool cPawn::IsFireproof(void) const
{
	return Super::IsFireproof() || HasEntityEffect(cEntityEffect::effFireResistance);
}





bool cPawn::IsInvisible() const
{
	return HasEntityEffect(cEntityEffect::effInvisibility);
}





void cPawn::HandleAir(void)
{
	if (IsHeadInWater() && HasEntityEffect(cEntityEffect::effWaterBreathing))
	{
		// Prevent the oxygen from decreasing
		return;
	}

	Super::HandleAir();
}





void cPawn::AddEntityEffect(cEntityEffect::eType a_EffectType, int a_Duration, short a_Intensity, double a_DistanceModifier)
{
	// Check if the plugins allow the addition:
	if (cPluginManager::Get()->CallHookEntityAddEffect(*this, a_EffectType, a_Duration, a_Intensity, a_DistanceModifier))
	{
		// A plugin disallows the addition, bail out.
		return;
	}

	// No need to add empty effects:
	if (a_EffectType == cEntityEffect::effNoEffect)
	{
		return;
	}
	a_Duration = static_cast<int>(a_Duration * a_DistanceModifier);

	// If we already have the effect, we have to deactivate it or else it will act cumulatively
	auto ExistingEffect = m_EntityEffects.find(a_EffectType);
	if (ExistingEffect != m_EntityEffects.end())
	{
		ExistingEffect->second->OnDeactivate(*this);
	}

	auto Res = m_EntityEffects.emplace(a_EffectType, cEntityEffect::CreateEntityEffect(a_EffectType, a_Duration, a_Intensity, a_DistanceModifier));
	m_World->BroadcastEntityEffect(*this, a_EffectType, a_Intensity, a_Duration);
	cEntityEffect * Effect = Res.first->second.get();
	Effect->OnActivate(*this);
}





void cPawn::RemoveEntityEffect(cEntityEffect::eType a_EffectType)
{
	m_World->BroadcastRemoveEntityEffect(*this, a_EffectType);
	auto itr = m_EntityEffects.find(a_EffectType);
	if (itr != m_EntityEffects.end())
	{
		// Erase from effect map before calling OnDeactivate to allow metadata broadcasts (e.g. for invisibility effect)
		auto Effect = std::move(itr->second);
		m_EntityEffects.erase(itr);
		Effect->OnDeactivate(*this);
	}
}





bool cPawn::HasEntityEffect(cEntityEffect::eType a_EffectType) const
{
	return m_EntityEffects.find(a_EffectType) != m_EntityEffects.end();
}





void cPawn::ClearEntityEffects()
{
	// Iterate through this entity's applied effects
	for (tEffectMap::iterator iter = m_EntityEffects.begin(); iter != m_EntityEffects.end();)
	{
		// Copy values to prevent pesky wrong erasures
		cEntityEffect::eType EffectType = iter->first;

		// Iterates (must be called before any possible erasure)
		++iter;

		// Remove effect
		RemoveEntityEffect(EffectType);
	}
}





void cPawn::NoLongerTargetingMe(cMonster * a_Monster)
{
	ASSERT(IsTicking());  // Our destroy override is supposed to clear all targets before we're destroyed.
	for (auto i = m_TargetingMe.begin(); i != m_TargetingMe.end(); ++i)
	{
		cMonster * Monster = *i;
		if (Monster == a_Monster)
		{
			ASSERT(Monster->GetTarget() != this);  // The monster is notifying us it is no longer targeting us, assert if that's a lie
			m_TargetingMe.erase(i);
			return;
		}
	}
	ASSERT(false);  // If this happens, something is wrong. Perhaps the monster never called TargetingMe() or called NoLongerTargetingMe() twice.
}





void cPawn::TargetingMe(cMonster * a_Monster)
{
	ASSERT(IsTicking());
	ASSERT(m_TargetingMe.size() < 10000);
	ASSERT(a_Monster->GetTarget() == this);
	m_TargetingMe.push_back(a_Monster);
}





void cPawn::HandleFalling(void)
{
	/* Not pretty looking, and is more suited to wherever server-sided collision detection is implemented.
	The following condition sets on-ground-ness if
	The player isn't swimming or flying (client hardcoded conditions) and
	they're on a block (Y is exact) - ensure any they could be standing on (including on the edges) is solid or
	they're on a slab (Y significand is 0.5) - ditto with slab check
	they're on a snow layer (Y divisible by 0.125) - ditto with snow layer check
	*/

	static const auto HalfWidth = GetWidth() / 2;
	static const auto EPS = 0.0001;

	/* Since swimming is decided in a tick and is asynchronous to this, we have to check for dampeners ourselves.
	The behaviour as of 1.8.9 is the following:
	- Landing in water alleviates all fall damage
	- Passing through any liquid (water + lava) and cobwebs "slows" the player down,
	i.e. resets the fall distance to that block, but only after checking for fall damage
	(this means that plummeting into lava will still kill the player via fall damage, although cobwebs
	will slow players down enough to have multiple updates that keep them alive)
	- Slime blocks reverse falling velocity, unless it's a crouching player, in which case they act as standard blocks.
	They also reset the topmost point of the damage calculation with each bounce,
	so if the block is removed while the player is bouncing or crouches after a bounce, the last bounce's zenith is considered as fall damage.

	With this in mind, we first check the block at the player's feet, then the one below that (because fences),
	and decide which behaviour we want to go with.
	*/
	BLOCKTYPE BlockAtFoot = (cChunkDef::IsValidHeight(POSY_TOINT)) ? GetWorld()->GetBlock(POS_TOINT) : E_BLOCK_AIR;

	/* We initialize these with what the foot is really IN, because for sampling we will move down with the epsilon above */
	bool IsFootInWater = IsBlockWater(BlockAtFoot);
	bool IsFootInLiquid = IsFootInWater || IsBlockLava(BlockAtFoot) || (BlockAtFoot == E_BLOCK_COBWEB);  // okay so cobweb is not _technically_ a liquid...
	bool IsFootOnSlimeBlock = false;

	/* The "cross" we sample around to account for the player width/girth */
	static const struct
	{
		int x, z;
	} CrossSampleCoords[] =
	{
		{ 0, 0 },
		{ 1, 0 },
		{ -1, 0 },
		{ 0, 1 },
		{ 0, -1 },
	};

	/* The blocks we're interested in relative to the player to account for larger than 1 blocks.
	This can be extended to do additional checks in case there are blocks that are represented as one block
	in memory but have a hitbox larger than 1 (like fences) */
	static const Vector3i BlockSampleOffsets[] =
	{
		{ 0, 0, 0 },  // TODO: something went wrong here (offset 0?)
		{ 0, -1, 0 },  // Potentially causes mis-detection (IsFootInWater) when player stands on block diagonal to water (i.e. on side of pool)
	};

	/* Here's the rough outline of how this mechanism works:
	We take the player's pointlike position (sole of feet), and expand it into a crosslike shape.
	If any of the five points hit a block, we consider the player to be "on" (or "in") the ground. */
	bool OnGround = false;
	for (size_t i = 0; i < ARRAYCOUNT(CrossSampleCoords); i++)
	{
		/* We calculate from the player's position, one of the cross-offsets above, and we move it down slightly so it's beyond inaccuracy.
		The added advantage of this method is that if the player is simply standing on the floor,
		the point will move into the next block, and the floor() will retrieve that instead of air. */
		Vector3d CrossTestPosition = GetPosition() + Vector3d(CrossSampleCoords[i].x * HalfWidth, -EPS, CrossSampleCoords[i].z * HalfWidth);

		/* We go through the blocks that we consider "relevant" */
		for (size_t j = 0; j < ARRAYCOUNT(BlockSampleOffsets); j++)
		{
			Vector3i BlockTestPosition = CrossTestPosition.Floor() + BlockSampleOffsets[j];

			if (!cChunkDef::IsValidHeight(BlockTestPosition.y))
			{
				continue;
			}

			BLOCKTYPE BlockType = GetWorld()->GetBlock(BlockTestPosition);
			NIBBLETYPE BlockMeta = GetWorld()->GetBlockMeta(BlockTestPosition);

			/* we do the cross-shaped sampling to check for water / liquids, but only on our level because water blocks are never bigger than unit voxels */
			if (j == 0)
			{
				IsFootInWater |= IsBlockWater(BlockType);
				IsFootInLiquid |= IsFootInWater || IsBlockLava(BlockType) || (BlockType == E_BLOCK_COBWEB);  // okay so cobweb is not _technically_ a liquid...
				IsFootOnSlimeBlock |= (BlockType == E_BLOCK_SLIME_BLOCK);
			}

			/* If the block is solid, and the blockhandler confirms the block to be inside, we're officially on the ground. */
			if ((cBlockInfo::IsSolid(BlockType)) && (cBlockHandler::For(BlockType).IsInsideBlock(CrossTestPosition - BlockTestPosition, BlockMeta)))
			{
				OnGround = true;
			}
		}
	}

	/* So here's the use of the rules above: */
	/* 1. Falling in water absorbs all fall damage */
	bool FallDamageAbsorbed = IsFootInWater;

	/* 2. Falling in liquid (lava, water, cobweb) or hitting a slime block resets the "fall zenith".
	Note: Even though the pawn bounces back with no damage after hitting the slime block,
	the "fall zenith" will continue to increase back up when flying upwards - which is good */
	bool ShouldBounceOnSlime = true;

	if (IsPlayer())
	{
		auto Player = static_cast<cPlayer *>(this);

		/* 3. If the player is flying or climbing, absorb fall damage */
		FallDamageAbsorbed |= Player->IsFlying() || Player->IsClimbing();

		/* 4. If the player is about to bounce on a slime block and is not crouching, absorb all fall damage  */
		ShouldBounceOnSlime = !Player->IsCrouched();
		FallDamageAbsorbed |= (IsFootOnSlimeBlock && ShouldBounceOnSlime);
	}
	else
	{
		/* 5. Bouncing on a slime block absorbs all fall damage  */
		FallDamageAbsorbed |= IsFootOnSlimeBlock;
	}

	/* If the player is not crouching or is not a player, shoot them back up.
	NOTE: this will only work in some cases; should be done in HandlePhysics() */
	if (IsFootOnSlimeBlock && ShouldBounceOnSlime)
	{
		// TODO: doesn't work too well, causes dissatisfactory experience for players on slime blocks - SetSpeedY(-GetSpeedY());
	}

	// TODO: put player speed into GetSpeedY, and use that.
	// If flying, climbing, swimming, or going up...
	if (FallDamageAbsorbed || ((GetPosition() - m_LastPosition).y > 0))
	{
		// ...update the ground height to have the highest position of the player (i.e. jumping up adds to the eventual fall damage)
		m_LastGroundHeight = GetPosY();
	}

	if (OnGround)
	{
		auto Damage = static_cast<int>(m_LastGroundHeight - GetPosY() - 3.0);
		if ((Damage > 0) && !FallDamageAbsorbed)
		{
			if (IsElytraFlying())
			{
				Damage = static_cast<int>(static_cast<float>(Damage) * 0.33);
			}

			// Fall particles:
			if (const auto Below = POS_TOINT.addedY(-1); Below.y >= 0)
			{
				const auto BlockBelow = GetWorld()->GetBlock(Below);

				if (BlockBelow == E_BLOCK_HAY_BALE)
				{
					Damage = std::clamp(static_cast<int>(static_cast<float>(Damage) * 0.2), 1, 20);
				}

				GetWorld()->BroadcastParticleEffect(
					"blockdust",
					GetPosition(),
					{ 0, 0, 0 },
					(Damage - 1.f) * ((0.3f - 0.1f) / (15.f - 1.f)) + 0.1f,  // Map damage (1 - 15) to particle speed (0.1 - 0.3)
					static_cast<int>((Damage - 1.f) * ((50.f - 20.f) / (15.f - 1.f)) + 20.f),  // Map damage (1 - 15) to particle quantity (20 - 50)
					{ { BlockBelow, 0 } }
				);
			}

			TakeDamage(dtFalling, nullptr, Damage, static_cast<float>(Damage), 0);
		}

		m_bTouchGround = true;
		m_LastGroundHeight = GetPosY();
	}
	else
	{
		m_bTouchGround = false;
	}

	/* Note: it is currently possible to fall through lava and still die from fall damage
	because of the client skipping an update about the lava block. This can only be resolved by
	somehow integrating these above checks into the tracer in HandlePhysics. */
}





void cPawn::OnRemoveFromWorld(cWorld & a_World)
{
	StopEveryoneFromTargetingMe();
	Super::OnRemoveFromWorld(a_World);
}





void cPawn::StopEveryoneFromTargetingMe()
{
	std::vector<cMonster*>::iterator i = m_TargetingMe.begin();
	while (i != m_TargetingMe.end())
	{
		cMonster * Monster = *i;
		ASSERT(Monster->GetTarget() == this);
		Monster->UnsafeUnsetTarget();
		i = m_TargetingMe.erase(i);
	}
	ASSERT(m_TargetingMe.size() == 0);
}





std::map<cEntityEffect::eType, cEntityEffect *> cPawn::GetEntityEffects() const
{
	std::map<cEntityEffect::eType, cEntityEffect *> Effects;
	for (auto & Effect : m_EntityEffects)
	{
		Effects.insert({ Effect.first, Effect.second.get() });
	}
	return Effects;
}





cEntityEffect * cPawn::GetEntityEffect(cEntityEffect::eType a_EffectType) const
{
	auto itr = m_EntityEffects.find(a_EffectType);
	return (itr != m_EntityEffects.end()) ? itr->second.get() : nullptr;
}





void cPawn::ResetPosition(Vector3d a_NewPosition)
{
	Super::ResetPosition(a_NewPosition);
	m_LastGroundHeight = GetPosY();
}





bool cPawn::DeductTotem(const eDamageType a_DamageType)
{
	if ((a_DamageType == dtAdmin) || (a_DamageType == dtInVoid))
	{
		// Beyond saving:
		return false;
	}

	if (!IsPlayer())
	{
		// TODO: implement when mobs will be able to pick up items based on CanPickUpLoot attribute:
		return false;
	}

	// If the player is holding a totem of undying in their off-hand or
	// main-hand slot and receives otherwise fatal damage, the totem saves the player from death.

	auto & inv = static_cast<cPlayer *>(this)->GetInventory();
	if (inv.GetEquippedItem().m_ItemType == E_ITEM_TOTEM_OF_UNDYING)
	{
		inv.SetEquippedItem({});
		return true;
	}
	if (inv.GetShieldSlot().m_ItemType == E_ITEM_TOTEM_OF_UNDYING)
	{
		inv.SetShieldSlot({});
		return true;
	}
	return false;
}





bool cPawn::FindTeleportDestination(cWorld & a_World, const int a_HeightRequired, const unsigned int a_NumTries, Vector3d & a_Destination, const Vector3i a_MinBoxCorner, const Vector3i a_MaxBoxCorner)
{
	/*
	Algorithm:
	Choose random destination.
	Seek downwards, regardless of distance until the block is made of movement-blocking material: https://minecraft.fandom.com/wiki/Materials
	Succeeds if no liquid or solid blocks prevents from standing at destination.
	*/
	auto & Random = GetRandomProvider();

	for (unsigned int i = 0; i < a_NumTries; i++)
	{
		const int DestX = Random.RandInt(a_MinBoxCorner.x, a_MaxBoxCorner.x);
		int DestY = Random.RandInt(a_MinBoxCorner.y, a_MaxBoxCorner.y);
		const int DestZ = Random.RandInt(a_MinBoxCorner.z, a_MaxBoxCorner.z);

		// Seek downwards from initial destination until we find a solid block or go into the void
		BLOCKTYPE DestBlock = a_World.GetBlock({DestX, DestY, DestZ});
		while ((DestY >= 0) && !cBlockInfo::IsSolid(DestBlock))
		{
			DestBlock = a_World.GetBlock({DestX, DestY, DestZ});
			DestY--;
		}

		// Couldn't find a solid block so move to next attempt
		if (DestY < 0)
		{
			continue;
		}

		// Succeed if blocks above destination are empty
		bool Success = true;
		for (int j = 1; j <= a_HeightRequired; j++)
		{
			BLOCKTYPE TestBlock = a_World.GetBlock({DestX, DestY + j, DestZ});
			if (cBlockInfo::IsSolid(TestBlock) || IsBlockLiquid(TestBlock))
			{
				Success = false;
				break;
			}
		}

		if (!Success)
		{
			continue;
		}

		// Offsets for entity to be centred and standing on solid block
		a_Destination = Vector3d(DestX + 0.5, DestY + 1, DestZ + 0.5);
		return true;
	}
	return false;
}





bool cPawn::FindTeleportDestination(cWorld & a_World, const int a_HeightRequired, const unsigned int a_NumTries, Vector3d & a_Destination, const cBoundingBox a_BoundingBox)
{
	return FindTeleportDestination(a_World, a_HeightRequired, a_NumTries, a_Destination, a_BoundingBox.GetMin(), a_BoundingBox.GetMax());
}





bool cPawn::FindTeleportDestination(cWorld & a_World, const int a_HeightRequired, const unsigned int a_NumTries, Vector3d & a_Destination, Vector3i a_Centre, const int a_HalfCubeWidth)
{
	Vector3i MinCorner(a_Centre.x - a_HalfCubeWidth, a_Centre.y - a_HalfCubeWidth, a_Centre.z - a_HalfCubeWidth);
	Vector3i MaxCorner(a_Centre.x + a_HalfCubeWidth, a_Centre.y + a_HalfCubeWidth, a_Centre.z + a_HalfCubeWidth);
	return FindTeleportDestination(a_World, a_HeightRequired, a_NumTries, a_Destination, MinCorner, MaxCorner);
}