d1dee3c909
On RasPi with gcc 4.8.2, the asserts wouldn't compile when tests were enabled. Enforced the assumption that ASSERT code is generated only in Debug builds.
468 lines
13 KiB
C++
468 lines
13 KiB
C++
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// ProjectileEntity.cpp
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// Implements the cProjectileEntity class representing the common base class for projectiles, as well as individual projectile types
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#include "Globals.h"
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#include "../Bindings/PluginManager.h"
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#include "ProjectileEntity.h"
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#include "../ClientHandle.h"
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#include "../LineBlockTracer.h"
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#include "../BoundingBox.h"
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#include "../ChunkMap.h"
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#include "../Chunk.h"
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#include "ArrowEntity.h"
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#include "ThrownEggEntity.h"
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#include "ThrownEnderPearlEntity.h"
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#include "ExpBottleEntity.h"
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#include "ThrownSnowballEntity.h"
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#include "FireChargeEntity.h"
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#include "FireworkEntity.h"
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#include "GhastFireballEntity.h"
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#include "WitherSkullEntity.h"
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#include "SplashPotionEntity.h"
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#include "Player.h"
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/** Converts an angle in radians into a byte representation used by the network protocol */
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#define ANGLE_TO_PROTO(X) static_cast<Byte>(X * 255 / 360)
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////////////////////////////////////////////////////////////////////////////////
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// cProjectileTracerCallback:
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class cProjectileTracerCallback :
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public cBlockTracer::cCallbacks
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{
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public:
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cProjectileTracerCallback(cProjectileEntity * a_Projectile) :
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m_Projectile(a_Projectile),
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m_SlowdownCoeff(0.99) // Default slowdown when not in water
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{
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}
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double GetSlowdownCoeff(void) const { return m_SlowdownCoeff; }
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protected:
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cProjectileEntity * m_Projectile;
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double m_SlowdownCoeff;
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// cCallbacks overrides:
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virtual bool OnNextBlock(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta, char a_EntryFace) override
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{
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/*
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// DEBUG:
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LOGD("Hit block %d:%d at {%d, %d, %d} face %d, %s (%s)",
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a_BlockType, a_BlockMeta,
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a_BlockX, a_BlockY, a_BlockZ, a_EntryFace,
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cBlockInfo::IsSolid(a_BlockType) ? "solid" : "non-solid",
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ItemToString(cItem(a_BlockType, 1, a_BlockMeta)).c_str()
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);
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*/
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if (cBlockInfo::IsSolid(a_BlockType))
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{
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// The projectile hit a solid block, calculate the exact hit coords:
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cBoundingBox bb(a_BlockX, a_BlockX + 1, a_BlockY, a_BlockY + 1, a_BlockZ, a_BlockZ + 1); // Bounding box of the block hit
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const Vector3d LineStart = m_Projectile->GetPosition(); // Start point for the imaginary line that goes through the block hit
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const Vector3d LineEnd = LineStart + m_Projectile->GetSpeed(); // End point for the imaginary line that goes through the block hit
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double LineCoeff = 0; // Used to calculate where along the line an intersection with the bounding box occurs
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eBlockFace Face; // Face hit
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if (bb.CalcLineIntersection(LineStart, LineEnd, LineCoeff, Face))
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{
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Vector3d Intersection = LineStart + m_Projectile->GetSpeed() * LineCoeff; // Point where projectile goes into the hit block
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if (cPluginManager::Get()->CallHookProjectileHitBlock(*m_Projectile, a_BlockX, a_BlockY, a_BlockZ, Face, &Intersection))
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{
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return false;
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}
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m_Projectile->OnHitSolidBlock(Intersection, Face);
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return true;
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}
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else
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{
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LOGD("WEIRD! block tracer reports a hit, but BBox tracer doesn't. Ignoring the hit.");
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}
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}
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// Convey some special effects from special blocks:
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switch (a_BlockType)
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{
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case E_BLOCK_LAVA:
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case E_BLOCK_STATIONARY_LAVA:
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{
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m_Projectile->StartBurning(30);
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m_SlowdownCoeff = std::min(m_SlowdownCoeff, 0.9); // Slow down to 0.9* the speed each tick when moving through lava
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break;
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}
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case E_BLOCK_WATER:
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case E_BLOCK_STATIONARY_WATER:
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{
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m_Projectile->StopBurning();
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m_SlowdownCoeff = std::min(m_SlowdownCoeff, 0.8); // Slow down to 0.8* the speed each tick when moving through water
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break;
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}
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} // switch (a_BlockType)
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// Continue tracing
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return false;
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}
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} ;
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////////////////////////////////////////////////////////////////////////////////
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// cProjectileEntityCollisionCallback:
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class cProjectileEntityCollisionCallback :
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public cEntityCallback
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{
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public:
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cProjectileEntityCollisionCallback(cProjectileEntity * a_Projectile, const Vector3d & a_Pos, const Vector3d & a_NextPos) :
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m_Projectile(a_Projectile),
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m_Pos(a_Pos),
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m_NextPos(a_NextPos),
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m_MinCoeff(1),
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m_HitEntity(nullptr)
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{
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}
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virtual bool Item(cEntity * a_Entity) override
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{
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if (
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(a_Entity == m_Projectile) || // Do not check collisions with self
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(a_Entity->GetUniqueID() == m_Projectile->GetCreatorUniqueID()) // Do not check whoever shot the projectile
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)
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{
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// Don't check creator only for the first 5 ticks so that projectiles can collide with the creator
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if (m_Projectile->GetTicksAlive() <= 5)
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{
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return false;
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}
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}
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cBoundingBox EntBox(a_Entity->GetPosition(), a_Entity->GetWidth() / 2, a_Entity->GetHeight());
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// Instead of colliding the bounding box with another bounding box in motion, we collide an enlarged bounding box with a hairline.
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// The results should be good enough for our purposes
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double LineCoeff;
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eBlockFace Face;
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EntBox.Expand(m_Projectile->GetWidth() / 2, m_Projectile->GetHeight() / 2, m_Projectile->GetWidth() / 2);
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if (!EntBox.CalcLineIntersection(m_Pos, m_NextPos, LineCoeff, Face))
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{
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// No intersection whatsoever
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return false;
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}
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if (!a_Entity->IsMob() && !a_Entity->IsMinecart() && !a_Entity->IsPlayer() && !a_Entity->IsBoat())
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{
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// Not an entity that interacts with a projectile
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return false;
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}
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if (cPluginManager::Get()->CallHookProjectileHitEntity(*m_Projectile, *a_Entity))
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{
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// A plugin disagreed.
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return false;
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}
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if (LineCoeff < m_MinCoeff)
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{
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// The entity is closer than anything we've stored so far, replace it as the potential victim
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m_MinCoeff = LineCoeff;
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m_HitEntity = a_Entity;
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}
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// Don't break the enumeration, we want all the entities
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return false;
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}
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/** Returns the nearest entity that was hit, after the enumeration has been completed */
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cEntity * GetHitEntity(void) const { return m_HitEntity; }
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/** Returns the line coeff where the hit was encountered, after the enumeration has been completed */
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double GetMinCoeff(void) const { return m_MinCoeff; }
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/** Returns true if the callback has encountered a true hit */
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bool HasHit(void) const { return (m_MinCoeff < 1); }
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protected:
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cProjectileEntity * m_Projectile;
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const Vector3d & m_Pos;
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const Vector3d & m_NextPos;
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double m_MinCoeff; // The coefficient of the nearest hit on the Pos line
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// Although it's bad(tm) to store entity ptrs from a callback, we can afford it here, because the entire callback
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// is processed inside the tick thread, so the entities won't be removed in between the calls and the final processing
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cEntity * m_HitEntity; // The nearest hit entity
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} ;
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////////////////////////////////////////////////////////////////////////////////
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// cProjectileEntity:
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cProjectileEntity::cProjectileEntity(eKind a_Kind, cEntity * a_Creator, double a_X, double a_Y, double a_Z, double a_Width, double a_Height) :
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super(etProjectile, a_X, a_Y, a_Z, a_Width, a_Height),
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m_ProjectileKind(a_Kind),
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m_CreatorData(
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((a_Creator != nullptr) ? a_Creator->GetUniqueID() : cEntity::INVALID_ID),
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((a_Creator != nullptr) ? (a_Creator->IsPlayer() ? static_cast<cPlayer *>(a_Creator)->GetName() : "") : ""),
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((a_Creator != nullptr) ? a_Creator->GetEquippedWeapon().m_Enchantments : cEnchantments())
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),
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m_IsInGround(false)
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{
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SetGravity(-12.0f);
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SetAirDrag(0.01f);
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}
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cProjectileEntity::cProjectileEntity(eKind a_Kind, cEntity * a_Creator, const Vector3d & a_Pos, const Vector3d & a_Speed, double a_Width, double a_Height) :
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super(etProjectile, a_Pos.x, a_Pos.y, a_Pos.z, a_Width, a_Height),
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m_ProjectileKind(a_Kind),
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m_CreatorData(a_Creator->GetUniqueID(), a_Creator->IsPlayer() ? static_cast<cPlayer *>(a_Creator)->GetName() : "", a_Creator->GetEquippedWeapon().m_Enchantments),
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m_IsInGround(false)
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{
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SetSpeed(a_Speed);
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SetYawFromSpeed();
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SetPitchFromSpeed();
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SetGravity(-12.0f);
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SetAirDrag(0.01f);
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}
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cProjectileEntity * cProjectileEntity::Create(eKind a_Kind, cEntity * a_Creator, double a_X, double a_Y, double a_Z, const cItem * a_Item, const Vector3d * a_Speed)
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{
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Vector3d Speed;
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if (a_Speed != nullptr)
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{
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Speed = *a_Speed;
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}
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switch (a_Kind)
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{
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case pkArrow: return new cArrowEntity (a_Creator, a_X, a_Y, a_Z, Speed);
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case pkEgg: return new cThrownEggEntity (a_Creator, a_X, a_Y, a_Z, Speed);
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case pkEnderPearl: return new cThrownEnderPearlEntity(a_Creator, a_X, a_Y, a_Z, Speed);
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case pkSnowball: return new cThrownSnowballEntity (a_Creator, a_X, a_Y, a_Z, Speed);
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case pkGhastFireball: return new cGhastFireballEntity (a_Creator, a_X, a_Y, a_Z, Speed);
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case pkFireCharge: return new cFireChargeEntity (a_Creator, a_X, a_Y, a_Z, Speed);
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case pkExpBottle: return new cExpBottleEntity (a_Creator, a_X, a_Y, a_Z, Speed);
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case pkSplashPotion: return new cSplashPotionEntity (a_Creator, a_X, a_Y, a_Z, Speed, *a_Item);
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case pkWitherSkull: return new cWitherSkullEntity (a_Creator, a_X, a_Y, a_Z, Speed);
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case pkFirework:
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{
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ASSERT(a_Item != nullptr);
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if (a_Item->m_FireworkItem.m_Colours.empty())
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{
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return nullptr;
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}
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return new cFireworkEntity(a_Creator, a_X, a_Y, a_Z, *a_Item);
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}
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case pkFishingFloat: break;
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}
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LOGWARNING("%s: Unknown projectile kind: %d", __FUNCTION__, a_Kind);
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return nullptr;
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}
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void cProjectileEntity::OnHitSolidBlock(const Vector3d & a_HitPos, eBlockFace a_HitFace)
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{
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// Set the position based on what face was hit:
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SetPosition(a_HitPos);
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SetSpeed(0, 0, 0);
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// DEBUG:
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LOGD("Projectile %d: pos {%.02f, %.02f, %.02f}, hit solid block at face %d",
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m_UniqueID,
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a_HitPos.x, a_HitPos.y, a_HitPos.z,
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a_HitFace
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);
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m_IsInGround = true;
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}
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void cProjectileEntity::OnHitEntity(cEntity & a_EntityHit, const Vector3d & a_HitPos)
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{
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UNUSED(a_HitPos);
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// If we were created by a player and we hit a pawn, notify attacking player's wolves
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if (a_EntityHit.IsPawn() && (GetCreatorName() != ""))
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{
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class cNotifyWolves : public cEntityCallback
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{
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public:
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cPawn * m_EntityHit;
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virtual bool Item(cEntity * a_Hitter) override
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{
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static_cast<cPlayer*>(a_Hitter)->NotifyNearbyWolves(m_EntityHit, true);
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return true;
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}
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} Callback;
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Callback.m_EntityHit = static_cast<cPawn*>(&a_EntityHit);
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m_World->DoWithEntityByID(GetCreatorUniqueID(), Callback);
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}
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}
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AString cProjectileEntity::GetMCAClassName(void) const
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{
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switch (m_ProjectileKind)
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{
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case pkArrow: return "Arrow";
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case pkSnowball: return "Snowball";
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case pkEgg: return "Egg";
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case pkGhastFireball: return "Fireball";
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case pkFireCharge: return "SmallFireball";
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case pkEnderPearl: return "ThrownEnderpearl";
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case pkExpBottle: return "ThrownExpBottle";
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case pkSplashPotion: return "SplashPotion";
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case pkWitherSkull: return "WitherSkull";
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case pkFirework: return "Firework";
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case pkFishingFloat: return ""; // Unknown, perhaps MC doesn't save this?
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}
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ASSERT(!"Unhandled projectile entity kind!");
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#ifndef __clang__
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return "";
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#endif
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}
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void cProjectileEntity::Tick(std::chrono::milliseconds a_Dt, cChunk & a_Chunk)
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{
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super::Tick(a_Dt, a_Chunk);
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BroadcastMovementUpdate();
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}
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void cProjectileEntity::HandlePhysics(std::chrono::milliseconds a_Dt, cChunk & a_Chunk)
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{
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if (m_IsInGround)
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{
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// Already-grounded projectiles don't move at all
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return;
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}
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auto DtSec = std::chrono::duration_cast<std::chrono::duration<double>>(a_Dt);
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const Vector3d DeltaSpeed = GetSpeed() * DtSec.count();
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const Vector3d Pos = GetPosition();
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const Vector3d NextPos = Pos + DeltaSpeed;
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// Test for entity collisions:
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cProjectileEntityCollisionCallback EntityCollisionCallback(this, Pos, NextPos);
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a_Chunk.ForEachEntity(EntityCollisionCallback);
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if (EntityCollisionCallback.HasHit())
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{
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// An entity was hit:
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Vector3d HitPos = Pos + (NextPos - Pos) * EntityCollisionCallback.GetMinCoeff();
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// DEBUG:
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LOGD("Projectile %d has hit an entity %d (%s) at {%.02f, %.02f, %.02f} (coeff %.03f)",
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m_UniqueID,
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EntityCollisionCallback.GetHitEntity()->GetUniqueID(),
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EntityCollisionCallback.GetHitEntity()->GetClass(),
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HitPos.x, HitPos.y, HitPos.z,
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EntityCollisionCallback.GetMinCoeff()
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);
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OnHitEntity(*(EntityCollisionCallback.GetHitEntity()), HitPos);
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}
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// TODO: Test the entities in the neighboring chunks, too
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// Trace the tick's worth of movement as a line:
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cProjectileTracerCallback TracerCallback(this);
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if (!cLineBlockTracer::Trace(*m_World, TracerCallback, Pos, NextPos))
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{
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// Something has been hit, abort all other processing
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return;
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}
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// The tracer also checks the blocks for slowdown blocks - water and lava - and stores it for later in its SlowdownCoeff
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// Update the position:
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SetPosition(NextPos);
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// Add slowdown and gravity effect to the speed:
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Vector3d NewSpeed(GetSpeed());
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NewSpeed.y += m_Gravity * DtSec.count();
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NewSpeed -= NewSpeed * (m_AirDrag * 20.0f) * DtSec.count();
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SetSpeed(NewSpeed);
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SetYawFromSpeed();
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SetPitchFromSpeed();
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/*
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LOGD("Projectile %d: pos {%.02f, %.02f, %.02f}, speed {%.02f, %.02f, %.02f}, rot {%.02f, %.02f}",
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m_UniqueID,
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GetPosX(), GetPosY(), GetPosZ(),
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GetSpeedX(), GetSpeedY(), GetSpeedZ(),
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GetYaw(), GetPitch()
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);
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*/
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}
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void cProjectileEntity::SpawnOn(cClientHandle & a_Client)
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{
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// Default spawning - use the projectile kind to spawn an object:
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a_Client.SendSpawnObject(*this, m_ProjectileKind, 12, ANGLE_TO_PROTO(GetYaw()), ANGLE_TO_PROTO(GetPitch()));
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a_Client.SendEntityMetadata(*this);
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}
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void cProjectileEntity::CollectedBy(cPlayer & a_Dest)
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{
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// Overriden in arrow
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UNUSED(a_Dest);
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}
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