FluidSimulator.cpp

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#include "Globals.h"

#include "FluidSimulator.h"
#include "../World.h"





cFluidSimulator::cFluidSimulator(cWorld & a_World, BLOCKTYPE a_Fluid, BLOCKTYPE a_StationaryFluid) :
    super(a_World),
    m_FluidBlock(a_Fluid),
    m_StationaryFluidBlock(a_StationaryFluid)
{
}





bool cFluidSimulator::IsAllowedBlock(BLOCKTYPE a_BlockType)
{
    return ((a_BlockType == m_FluidBlock) || (a_BlockType == m_StationaryFluidBlock));
}





bool cFluidSimulator::CanWashAway(BLOCKTYPE a_BlockType)
{
    switch (a_BlockType)
    {
        case E_BLOCK_ACTIVATOR_RAIL:
        case E_BLOCK_ACTIVE_COMPARATOR:
        case E_BLOCK_BEETROOTS:
        case E_BLOCK_BIG_FLOWER:
        case E_BLOCK_BROWN_MUSHROOM:
        case E_BLOCK_CACTUS:
        case E_BLOCK_COBWEB:
        case E_BLOCK_CROPS:
        case E_BLOCK_DEAD_BUSH:
        case E_BLOCK_DETECTOR_RAIL:
        case E_BLOCK_INACTIVE_COMPARATOR:
        case E_BLOCK_LILY_PAD:
        case E_BLOCK_POWERED_RAIL:
        case E_BLOCK_RAIL:
        case E_BLOCK_REDSTONE_REPEATER_OFF:
        case E_BLOCK_REDSTONE_REPEATER_ON:
        case E_BLOCK_REDSTONE_TORCH_OFF:
        case E_BLOCK_REDSTONE_TORCH_ON:
        case E_BLOCK_REDSTONE_WIRE:
        case E_BLOCK_RED_MUSHROOM:
        case E_BLOCK_RED_ROSE:
        case E_BLOCK_SNOW:
        case E_BLOCK_SUGARCANE:
        case E_BLOCK_TALL_GRASS:
        case E_BLOCK_TORCH:
        case E_BLOCK_TRIPWIRE_HOOK:
        case E_BLOCK_TRIPWIRE:
        case E_BLOCK_YELLOW_FLOWER:
        {
            return true;
        }
        default:
        {
            return false;
        }
    }
}





bool cFluidSimulator::IsSolidBlock(BLOCKTYPE a_BlockType)
{
    return !IsPassableForFluid(a_BlockType);
}





bool cFluidSimulator::IsPassableForFluid(BLOCKTYPE a_BlockType)
{
    return (
        (a_BlockType == E_BLOCK_AIR) ||
        (a_BlockType == E_BLOCK_FIRE) ||
        IsAllowedBlock(a_BlockType) ||
        CanWashAway(a_BlockType)
    );
}





bool cFluidSimulator::IsHigherMeta(NIBBLETYPE a_Meta1, NIBBLETYPE a_Meta2)
{
    if (a_Meta1 == 0)
    {
        // Source block is higher than anything, even itself.
        return true;
    }
    if ((a_Meta1 & 0x08) != 0)
    {
        // Falling fluid is higher than anything, including self
        return true;
    }

    if (a_Meta2 == 0)
    {
        // Second block is a source and first block isn't
        return false;
    }
    if ((a_Meta2 & 0x08) != 0)
    {
        // Second block is falling and the first one is neither a source nor falling
        return false;
    }

    // All special cases have been handled, now it's just a raw comparison:
    return (a_Meta1 < a_Meta2);
}





Vector3f cFluidSimulator::GetFlowingDirection(int a_X, int a_Y, int a_Z)
{
    if (!cChunkDef::IsValidHeight(a_Y))
    {
        return {};
    }

    if (!IsAllowedBlock(m_World.GetBlock(a_X, a_Y, a_Z)))  // No Fluid -> No Flowing direction :D
    {
        return {};
    }

    const auto HeightFromMeta = [](NIBBLETYPE a_BlockMeta) -> NIBBLETYPE
        {
            // Falling water blocks are always full height (0)
            return ((a_BlockMeta & 0x08) != 0) ? 0 : a_BlockMeta;
        };

    auto BlockMeta = m_World.GetBlockMeta(a_X, a_Y, a_Z);
    NIBBLETYPE CentralPoint = HeightFromMeta(BlockMeta);
    NIBBLETYPE LevelPoint[4];

    // blocks around the checking pos
    Vector3i Points[]
    {
        { a_X + 1, a_Y, a_Z },
        { a_X, a_Y, a_Z + 1 },
        { a_X - 1, a_Y, a_Z },
        { a_X, a_Y, a_Z - 1 }
    };

    for (size_t i = 0; i < ARRAYCOUNT(LevelPoint); i++)
    {
        if (IsAllowedBlock(m_World.GetBlock(Points[i])))
        {
            LevelPoint[i] = HeightFromMeta(m_World.GetBlockMeta(Points[i]));
        }
        else
        {
            LevelPoint[i] = CentralPoint;
        }
    }

    Vector3f Direction;

    // Calculate the flow direction

    Direction.x = (LevelPoint[0] - LevelPoint[2]) / 2.0f;
    Direction.z = (LevelPoint[1] - LevelPoint[3]) / 2.0f;

    if ((BlockMeta & 0x08) != 0)  // Test falling bit
    {
        Direction.y = -1.0f;
    }

    return Direction;
}