void cPlayer::UpdateMovementStats(const Vector3d & a_DeltaPos)
{
StatValue Value = (StatValue)floor(a_DeltaPos.Length() * 100 + 0.5);
if (m_AttachedTo == NULL)
{
if (IsClimbing())
{
if (a_DeltaPos.y > 0.0) // Going up
{
m_Stats.AddValue(statDistClimbed, (StatValue)floor(a_DeltaPos.y * 100 + 0.5));
}
}
else if (IsSubmerged())
{
m_Stats.AddValue(statDistDove, Value);
AddFoodExhaustion(0.00015 * (double)Value);
}
else if (IsSwimming())
{
m_Stats.AddValue(statDistSwum, Value);
AddFoodExhaustion(0.00015 * (double)Value);
}
else if (IsOnGround())
{
m_Stats.AddValue(statDistWalked, Value);
AddFoodExhaustion((m_IsSprinting ? 0.001 : 0.0001) * (double)Value);
}
else
{
if (Value >= 25) // Ignore small/slow movement
{
m_Stats.AddValue(statDistFlown, Value);
}
}
}
else
{
switch (m_AttachedTo->GetEntityType())
{
case cEntity::etMinecart: m_Stats.AddValue(statDistMinecart, Value); break;
case cEntity::etBoat: m_Stats.AddValue(statDistBoat, Value); break;
case cEntity::etMonster:
{
cMonster * Monster = (cMonster *)m_AttachedTo;
switch (Monster->GetMobType())
{
case cMonster::mtPig: m_Stats.AddValue(statDistPig, Value); break;
case cMonster::mtHorse: m_Stats.AddValue(statDistHorse, Value); break;
default: break;
}
break;
}
default: break;
}
}
}
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 struct
{
int x, y, z;
} 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() + Vector3i(BlockSampleOffsets[j].x, BlockSampleOffsets[j].y, BlockSampleOffsets[j].z);
if (!cChunkDef::IsValidHeight(BlockTestPosition.y))
{
continue;
}
BLOCKTYPE Block = 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(Block);
IsFootInLiquid |= IsFootInWater || IsBlockLava(Block) || (Block == E_BLOCK_COBWEB); // okay so cobweb is not _technically_ a liquid...
IsFootOnSlimeBlock |= (Block == 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(Block)) && (cBlockInfo::GetHandler(Block)->IsInsideBlock(CrossTestPosition - BlockTestPosition, Block, 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)
{
TakeDamage(dtFalling, nullptr, Damage, Damage, 0);
// Fall particles
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)
{ { GetWorld()->GetBlock(POS_TOINT - Vector3i(0, 1, 0)), 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. */
}