FallingBlock.cpp

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#include "Globals.h"

#include "FallingBlock.h"
#include "../World.h"
#include "../ClientHandle.h"
#include "../Simulator/SandSimulator.h"
#include "../Chunk.h"





cFallingBlock::cFallingBlock(Vector3i a_BlockPosition, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta) :
    super(etFallingBlock, Vector3d(0.5, 0, 0.5) + a_BlockPosition, 0.98, 0.98),
    m_BlockType(a_BlockType),
    m_BlockMeta(a_BlockMeta),
    m_OriginalPosition(a_BlockPosition)
{
    SetGravity(-16.0f);
    SetAirDrag(0.02f);
}





void cFallingBlock::SpawnOn(cClientHandle & a_ClientHandle)
{
    a_ClientHandle.SendSpawnFallingBlock(*this);
}





void cFallingBlock::Tick(std::chrono::milliseconds a_Dt, cChunk & a_Chunk)
{
    // GetWorld()->BroadcastTeleportEntity(*this);  // Test position

    int BlockX = POSX_TOINT;
    int BlockY = static_cast<int>(GetPosY() - 0.5);
    int BlockZ = POSZ_TOINT;

    if (BlockY < 0)
    {
        // Fallen out of this world, just continue falling until out of sight, then destroy:
        if (BlockY < VOID_BOUNDARY)
        {
            Destroy(true);
        }
        return;
    }

    if (BlockY >= cChunkDef::Height)
    {
        // Above the world, just wait for it to fall back down
        return;
    }

    BLOCKTYPE BlockBelow = a_Chunk.GetBlock(BlockX - a_Chunk.GetPosX() * cChunkDef::Width, BlockY, BlockZ - a_Chunk.GetPosZ() * cChunkDef::Width);
    NIBBLETYPE BelowMeta = a_Chunk.GetMeta(BlockX - a_Chunk.GetPosX() * cChunkDef::Width, BlockY, BlockZ - a_Chunk.GetPosZ() * cChunkDef::Width);
    if (cSandSimulator::DoesBreakFallingThrough(BlockBelow, BelowMeta))
    {
        // Fallen onto a block that breaks this into pickups (e. g. half-slab)
        // Must finish the fall with coords one below the block:
        cSandSimulator::FinishFalling(m_World, BlockX, BlockY, BlockZ, m_BlockType, m_BlockMeta);
        Destroy(true);
        return;
    }
    else if (!cSandSimulator::CanContinueFallThrough(BlockBelow))
    {
        // Fallen onto a solid block
        /*
        FLOGD(
            "Sand: Checked below at {0} (rel {1}), it's {2}, finishing the fall.",
            Vector3i{BlockX, BlockY, BlockZ},
            cChunkDef::AbsoluteToRelative({BlockX, BlockY, BlockZ}, {a_Chunk.GetPosX(), a_Chunk.GetPosZ()}),
            ItemTypeToString(BlockBelow)
        );
        */

        if (BlockY < cChunkDef::Height - 1)
        {
            cSandSimulator::FinishFalling(m_World, BlockX, BlockY + 1, BlockZ, m_BlockType, m_BlockMeta);
        }
        Destroy(true);
        return;
    }
    else if ((m_BlockType == E_BLOCK_CONCRETE_POWDER) && IsBlockWater(BlockBelow))
    {
        // Concrete powder falling into water solidifies on the first water it touches
        cSandSimulator::FinishFalling(m_World, BlockX, BlockY, BlockZ, E_BLOCK_CONCRETE, m_BlockMeta);
        Destroy(true);
        return;
    }

    float MilliDt = a_Dt.count() * 0.001f;
    AddSpeedY(MilliDt * -9.8f);
    AddPosition(GetSpeed() * MilliDt);

    // If not static (one billionth precision) broadcast movement
    if ((fabs(GetSpeedX()) > std::numeric_limits<double>::epsilon()) || (fabs(GetSpeedZ()) > std::numeric_limits<double>::epsilon()))
    {
        BroadcastMovementUpdate();
    }
}