NetherPortalScanner.cpp

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

#include "NetherPortalScanner.h"
#include "Entities/Entity.h"
#include "World.h"





const double cNetherPortalScanner::OutOffset = 0.5;
const double cNetherPortalScanner::AcrossOffset = 0.5;





cNetherPortalScanner::cNetherPortalScanner(cEntity * a_MovingEntity, cWorld * a_DestinationWorld, Vector3d a_DestPosition, int a_MaxY) :
    m_Entity(a_MovingEntity),
    m_World(a_DestinationWorld),
    m_FoundPortal(false),
    m_BuildPlatform(true),
    m_Dir(Direction::X),
    m_PortalLoc(a_DestPosition.Floor()),
    m_Position(a_DestPosition),
    m_MaxY(a_MaxY)
{
    int MinX = FloorC((m_Position.x - SearchRadius) / cChunkDef::Width);
    int MinZ = FloorC((m_Position.z - SearchRadius) / cChunkDef::Width);
    int MaxX = CeilC((m_Position.x + SearchRadius) / cChunkDef::Width);
    int MaxZ = CeilC((m_Position.z + SearchRadius) / cChunkDef::Width);
    for (int x = MinX; x < MaxX; x++)
    {
        for (int z = MinZ; z < MaxZ; z++)
        {
            Add(x, z);
        }
    }
    Enable(*a_DestinationWorld->GetChunkMap());
}





void cNetherPortalScanner::OnChunkAvailable(int a_ChunkX, int a_ChunkZ)
{
    cChunkDef::BlockTypes blocks;
    m_World->GetChunkBlockTypes(a_ChunkX, a_ChunkZ, blocks);

    // Iterate through all of the blocks in the chunk
    for (unsigned int i = 0; i < cChunkDef::NumBlocks; i++)
    {
        if (blocks[i] == E_BLOCK_NETHER_PORTAL)
        {
            Vector3i Coordinate = cChunkDef::IndexToCoordinate(i);
            if (Coordinate.y >= m_MaxY)
            {
                // This is above the map, don't consider it.
                continue;
            }

            Vector3d PortalLoc = Vector3d(Coordinate.x + a_ChunkX * cChunkDef::Width, Coordinate.y, Coordinate.z + a_ChunkZ * cChunkDef::Width);
            if (!m_FoundPortal)
            {
                m_FoundPortal = true;
                m_PortalLoc = PortalLoc;
            }
            else
            {
                if ((PortalLoc - m_Position).SqrLength() < (m_PortalLoc - m_Position).SqrLength())
                {
                    m_FoundPortal = true;
                    m_PortalLoc = PortalLoc;
                }
            }
        }
    }
}





bool cNetherPortalScanner::IsValidBuildLocation(Vector3i a_BlockPos)
{
    // Check the base
    for (int i = 0; i < SearchSolidBaseWidth; i++)
    {
        for (int j = 0; j < PortalLength; j++)
        {
            BLOCKTYPE blocktype = m_World->GetBlock(a_BlockPos.x + i, a_BlockPos.y, a_BlockPos.z + j);
            if (!cBlockInfo::IsSolid(blocktype))
            {
                return false;
            }

            // Check the airspace
            for (int k = 1; k < PortalHeight; k++)
            {
                blocktype = m_World->GetBlock(a_BlockPos.x + i, a_BlockPos.y + k, a_BlockPos.z + j);
                if (blocktype != E_BLOCK_AIR)
                {
                    return false;
                }
            }
        }
    }
    return true;
}





bool cNetherPortalScanner::OnAllChunksAvailable(void)
{
    if (m_FoundPortal)
    {
        // Find the bottom of this portal
        while (m_World->GetBlock(m_PortalLoc.x, m_PortalLoc.y, m_PortalLoc.z) == E_BLOCK_NETHER_PORTAL)
        {
            m_PortalLoc.y -= 1;
        }
        m_PortalLoc.y += 1;

        // Figure out which way the portal is facing
        int BXP = m_World->GetBlock(m_PortalLoc.x + 1, m_PortalLoc.y, m_PortalLoc.z);
        int BXM = m_World->GetBlock(m_PortalLoc.x - 1, m_PortalLoc.y, m_PortalLoc.z);
        if ((BXP == E_BLOCK_NETHER_PORTAL) || (BXM == E_BLOCK_NETHER_PORTAL))
        {
            // The long axis is along X
            m_Dir = Direction::X;
        }
        else
        {
            // The long axis is along Z
            m_Dir = Direction::Y;
        }
    }
    else
    {
        // Scan the area for a suitable location
        int minx = FloorC(m_Position.x) - BuildSearchRadius;
        int minz = FloorC(m_Position.z) - BuildSearchRadius;
        int maxx = FloorC(m_Position.x) + BuildSearchRadius;
        int maxz = FloorC(m_Position.z) + BuildSearchRadius;
        int maxy = m_MaxY;
        std::vector<Vector3i> Possibilities;
        int x, y, z;
        for (y = 0; y < maxy - PortalHeight; y++)
        {
            for (x = minx; x < maxx - PortalLength; x++)
            {
                for (z = minz; z < maxz - SearchSolidBaseWidth; z++)
                {
                    Vector3i Location = Vector3i(x, y, z);
                    if (IsValidBuildLocation(Location))
                    {
                        Possibilities.push_back(Vector3i(x, y, z));
                    }
                }
            }
        }

        if (Possibilities.size() > 0)
        {
            m_BuildPlatform = false;

            // Find the nearest
            double DistanceToClosest = (Possibilities[0] - m_Position).SqrLength();
            Vector3i Closest = Possibilities[0];
            for (const auto & itr : Possibilities)
            {
                double Distance = (itr - m_Position).SqrLength();
                if (Distance < DistanceToClosest)
                {
                    DistanceToClosest = Distance;
                    Closest = itr;
                }
            }

            m_PortalLoc = Closest;
        }
    }
    return true;
}





void cNetherPortalScanner::BuildNetherPortal(Vector3i a_Location, Direction a_Direction, bool a_IncludePlatform)
{
    int x = a_Location.x;
    int y = a_Location.y;
    int z = a_Location.z;

    // Clear a 3x4x4 area starting right above the base
    for (int i = 0; i < SearchSolidBaseWidth; i++)
    {
        for (int j = 0; j < PortalLength; j++)
        {
            for (int k = 1; k < PortalHeight; k++)
            {
                if (a_Direction == Direction::Y)
                {
                    m_World->SetBlock(x + i, y + k, z + j, E_BLOCK_AIR, 0);
                }
                else if (a_Direction == Direction::X)
                {
                    m_World->SetBlock(x + j, y + k, z + i, E_BLOCK_AIR, 0);
                }
            }
        }
    }

    // Put in an obsidian base
    if (a_IncludePlatform)
    {
        for (int j = 0; j < PortalLength; j++)
        {
            // +2 on the short axis because that's where we deposit the entity
            if (a_Direction == Direction::Y)
            {
                m_World->SetBlock(x + 2, y, z + j, E_BLOCK_OBSIDIAN, 0);
            }
            else if (a_Direction == Direction::X)
            {
                m_World->SetBlock(x + j, y, z + 2, E_BLOCK_OBSIDIAN, 0);
            }
        }
    }

    // Build an obsidian frame
    for (int i = 0; i < PortalHeight; i++)
    {
        if (a_Direction == Direction::Y)
        {
            m_World->SetBlock(x + 1, y + i, z, E_BLOCK_OBSIDIAN, 0);
            m_World->SetBlock(x + 1, y + i, z + 3, E_BLOCK_OBSIDIAN, 0);
        }
        else if (a_Direction == Direction::X)
        {
            m_World->SetBlock(x, y + i, z + 1, E_BLOCK_OBSIDIAN, 0);
            m_World->SetBlock(x + 3, y + i, z + 1, E_BLOCK_OBSIDIAN, 0);
        }
    }
    for (int i = 0; i < PortalLength; i++)
    {
        if (a_Direction == Direction::Y)
        {
            m_World->SetBlock(x + 1, y + 4, z + i, E_BLOCK_OBSIDIAN, 0);
            m_World->SetBlock(x + 1, y, z + i, E_BLOCK_OBSIDIAN, 0);
        }
        else if (a_Direction == Direction::X)
        {
            m_World->SetBlock(x + i, y + 4, z + 1, E_BLOCK_OBSIDIAN, 0);
            m_World->SetBlock(x + i, y, z + 1, E_BLOCK_OBSIDIAN, 0);
        }
    }

    // Fill the frame (place a fire in the bottom)
    m_World->SetBlock(x + 1, y + 1, z + 1, E_BLOCK_FIRE, 0);
}





void cNetherPortalScanner::OnDisabled(void)
{
    // Now we actually move the player
    if (!m_FoundPortal)
    {
        // Build a new nether portal.
        FLOGD("Building nether portal at {0}", m_PortalLoc);
        BuildNetherPortal(m_PortalLoc, m_Dir, m_BuildPlatform);
        m_PortalLoc.x += 1;
        m_PortalLoc.y += 1;
        m_PortalLoc.z += 1;
    }

    // Put the entity near the opening
    Vector3d Position = m_PortalLoc;
    if (m_Dir == Direction::Y)
    {
        Position.x += OutOffset;
        Position.z += AcrossOffset;
    }
    else if (m_Dir == Direction::X)
    {
        Position.x += AcrossOffset;
        Position.z += OutOffset;
    }

    FLOGD("Placing player at {0}", Position);
    m_Entity->ScheduleMoveToWorld(m_World, Position, true);
    delete this;
}