Inventory.cpp

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#include "Globals.h"  // NOTE: MSVC stupidness requires this to be the same across all modules
 
#include "Inventory.h"
#include "Entities/Player.h"
#include "ClientHandle.h"
#include "UI/Window.h"
#include "Item.h"
#include "Root.h"
#include "World.h"
 
#include "json/json.h"
 
#include "Items/ItemHandler.h"
 
 
 
 
 
cInventory::cInventory(cPlayer & a_Owner) :
    m_ArmorSlots    (1, 4),  // 1 x 4 slots
    m_InventorySlots(9, 3),  // 9 x 3 slots
    m_HotbarSlots   (9, 1),  // 9 x 1 slots
    m_ShieldSlots   (1, 1),  // 1 x 1 slots
    m_Owner(a_Owner)
{
    // Ask each ItemGrid to report changes to us:
    m_ArmorSlots.AddListener(*this);
    m_InventorySlots.AddListener(*this);
    m_HotbarSlots.AddListener(*this);
    m_ShieldSlots.AddListener(*this);
 
    SetEquippedSlotNum(0);
}
 
 
 
 
 
void cInventory::Clear(void)
{
    m_ArmorSlots.Clear();
    m_InventorySlots.Clear();
    m_HotbarSlots.Clear();
    m_ShieldSlots.Clear();
}
 
 
 
 
 
int cInventory::HowManyCanFit(const cItem & a_ItemStack, bool a_ConsiderEmptySlots)
{
    return HowManyCanFit(a_ItemStack, 0, invNumSlots - 1, a_ConsiderEmptySlots);
}
 
 
 
 
 
int cInventory::HowManyCanFit(const cItem & a_ItemStack, int a_BeginSlotNum, int a_EndSlotNum, bool a_ConsiderEmptySlots)
{
 
    UNUSED(a_ConsiderEmptySlots);
    if ((a_BeginSlotNum < 0) || (a_BeginSlotNum >= invNumSlots))
    {
        LOGWARNING("%s: Bad BeginSlotNum, got %d, there are %d slots; correcting to 0.", __FUNCTION__, a_BeginSlotNum, invNumSlots - 1);
        a_BeginSlotNum = 0;
    }
    if ((a_EndSlotNum < 0) || (a_EndSlotNum >= invNumSlots))
    {
        LOGWARNING("%s: Bad EndSlotNum, got %d, there are %d slots; correcting to %d.", __FUNCTION__, a_BeginSlotNum, invNumSlots, invNumSlots - 1);
        a_EndSlotNum = invNumSlots - 1;
    }
    if (a_BeginSlotNum > a_EndSlotNum)
    {
        std::swap(a_BeginSlotNum, a_EndSlotNum);
    }
 
    char NumLeft = a_ItemStack.m_ItemCount;
    char MaxStack = a_ItemStack.GetMaxStackSize();
    for (int i = a_BeginSlotNum; i <= a_EndSlotNum; i++)
    {
        const cItem & Slot = GetSlot(i);
        if (Slot.IsEmpty())
        {
            NumLeft -= MaxStack;
        }
        else if (Slot.IsEqual(a_ItemStack))
        {
            NumLeft -= MaxStack - Slot.m_ItemCount;
        }
        if (NumLeft <= 0)
        {
            // All items fit
            return a_ItemStack.m_ItemCount;
        }
    }  // for i - m_Slots[]
    return a_ItemStack.m_ItemCount - NumLeft;
}
 
 
 
 
 
char cInventory::AddItem(const cItem & a_Item, bool a_AllowNewStacks)
{
    m_Owner.AddKnownItem(a_Item);
 
    cItem ToAdd(a_Item);
    char res = 0;
 
    // When the item is a armor, try to set it directly to the armor slot.
    if (ItemCategory::IsArmor(a_Item.m_ItemType))
    {
        for (int i = 0; i < m_ArmorSlots.GetNumSlots(); i++)
        {
            if (m_ArmorSlots.GetSlot(i).IsEmpty() && cSlotAreaArmor::CanPlaceArmorInSlot(i, a_Item))
            {
                m_ArmorSlots.SetSlot(i, a_Item);
                return a_Item.m_ItemCount;
            }
        }
    }
 
    // Add to existing stacks in the hotbar.
    res += m_HotbarSlots.AddItem(ToAdd, false);
    ToAdd.m_ItemCount = static_cast<char>(a_Item.m_ItemCount - res);
    if (ToAdd.m_ItemCount == 0)
    {
        return res;
    }
 
    // Add to existing stacks in main inventory.
    res += m_InventorySlots.AddItem(ToAdd, false);
    ToAdd.m_ItemCount = static_cast<char>(a_Item.m_ItemCount - res);
    if (ToAdd.m_ItemCount == 0)
    {
        return res;
    }
 
    // All existing stacks are now filled.
    if (!a_AllowNewStacks)
    {
        return res;
    }
 
    // Try adding new stacks to the hotbar.
    res += m_HotbarSlots.AddItem(ToAdd, true);
    ToAdd.m_ItemCount = static_cast<char>(a_Item.m_ItemCount - res);
    if (ToAdd.m_ItemCount == 0)
    {
        return res;
    }
 
    // Try adding new stacks to the main inventory.
    res += m_InventorySlots.AddItem(ToAdd, true);
    return res;
}
 
 
 
 
 
char cInventory::AddItems(cItems & a_ItemStackList, bool a_AllowNewStacks)
{
    char TotalAdded = 0;
    for (cItems::iterator itr = a_ItemStackList.begin(); itr != a_ItemStackList.end();)
    {
        char NumAdded = AddItem(*itr, a_AllowNewStacks);
        if (itr->m_ItemCount == NumAdded)
        {
            itr = a_ItemStackList.erase(itr);
        }
        else
        {
            itr->m_ItemCount -= NumAdded;
            ++itr;
        }
        TotalAdded += NumAdded;
    }
    return TotalAdded;
}
 
 
 
 
 
int cInventory::RemoveItem(const cItem & a_ItemStack)
{
    char RemovedItems = m_ShieldSlots.RemoveItem(a_ItemStack);
 
    if (RemovedItems < a_ItemStack.m_ItemCount)
    {
        RemovedItems += m_HotbarSlots.RemoveItem(a_ItemStack);
    }
 
    if (RemovedItems < a_ItemStack.m_ItemCount)
    {
        cItem Temp(a_ItemStack);
        Temp.m_ItemCount -= RemovedItems;
        RemovedItems += m_InventorySlots.RemoveItem(Temp);
    }
 
    return RemovedItems;
}
 
 
 
 
 
cItem * cInventory::FindItem(const cItem & a_RecipeItem)
{
    cItem * Item = m_ShieldSlots.FindItem(a_RecipeItem);
    if (Item != nullptr)
    {
        return Item;
    }
    Item = m_HotbarSlots.FindItem(a_RecipeItem);
    if (Item != nullptr)
    {
        return Item;
    }
 
    return  m_InventorySlots.FindItem(a_RecipeItem);
}
 
 
 
 
 
bool cInventory::RemoveOneEquippedItem(void)
{
    if (m_HotbarSlots.GetSlot(m_EquippedSlotNum).IsEmpty())
    {
        return false;
    }
 
    m_HotbarSlots.ChangeSlotCount(m_EquippedSlotNum, -1);
    return true;
}
 
 
 
 
 
int cInventory::ReplaceOneEquippedItem(const cItem & a_Item, bool a_TryOtherSlots)
{
    // Ignore whether there was an item in the slot to remove.
    RemoveOneEquippedItem();
 
    auto EquippedItem = GetEquippedItem();
    if (EquippedItem.IsEmpty())
    {
        SetEquippedItem(a_Item);
        return a_Item.m_ItemCount;
    }
 
    // Handle case when equipped item is the same as the replacement item.
    cItem ItemsToAdd = a_Item;
    if (EquippedItem.IsEqual(ItemsToAdd))
    {
        auto AmountToAdd = std::min(static_cast<char>(ItemsToAdd.GetMaxStackSize() - EquippedItem.m_ItemCount), ItemsToAdd.m_ItemCount);
 
        EquippedItem.m_ItemCount += AmountToAdd;
        SetEquippedItem(EquippedItem);
        ItemsToAdd.m_ItemCount -= AmountToAdd;
    }
 
    auto ItemsAdded = a_Item.m_ItemCount - ItemsToAdd.m_ItemCount;
 
    if (ItemsToAdd.m_ItemCount == 0)
    {
        return ItemsAdded;
    }
 
    if (!a_TryOtherSlots)
    {
        return ItemsAdded;
    }
 
    // Try the rest of the inventory.
    return AddItem(ItemsToAdd) + ItemsAdded;
}
 
 
 
 
 
int cInventory::HowManyItems(const cItem & a_Item)
{
    return
        m_ArmorSlots.HowManyItems(a_Item) +
        m_InventorySlots.HowManyItems(a_Item) +
        m_HotbarSlots.HowManyItems(a_Item) +
        m_ShieldSlots.HowManyItems(a_Item);
}
 
 
 
 
 
bool cInventory::HasItems(const cItem & a_ItemStack)
{
    int CurrentlyHave = HowManyItems(a_ItemStack);
    return (CurrentlyHave >= a_ItemStack.m_ItemCount);
}
 
 
 
 
 
void cInventory::SetSlot(int a_SlotNum, const cItem & a_Item)
{
    if ((a_SlotNum < 0) || (a_SlotNum >= invNumSlots))
    {
        LOGWARNING("%s: requesting an invalid slot index: %d out of %d. Ignoring.", __FUNCTION__, a_SlotNum, invNumSlots - 1);
        return;
    }
 
    int GridSlotNum = 0;
    cItemGrid * Grid = GetGridForSlotNum(a_SlotNum, GridSlotNum);
    if (Grid == nullptr)
    {
        LOGWARNING("%s(%d): requesting an invalid itemgrid. Ignoring.", __FUNCTION__, a_SlotNum);
        return;
    }
    Grid->SetSlot(GridSlotNum, a_Item);
}
 
 
 
 
 
void cInventory::SetArmorSlot(int a_ArmorSlotNum, const cItem & a_Item)
{
    m_ArmorSlots.SetSlot(a_ArmorSlotNum, a_Item);
}
 
 
 
 
 
void cInventory::SetInventorySlot(int a_InventorySlotNum, const cItem & a_Item)
{
    m_InventorySlots.SetSlot(a_InventorySlotNum, a_Item);
}
 
 
 
 
 
void cInventory::SetHotbarSlot(int a_HotBarSlotNum, const cItem & a_Item)
{
    m_HotbarSlots.SetSlot(a_HotBarSlotNum, a_Item);
}
 
 
 
 
 
void cInventory::SetShieldSlot(const cItem & a_Item)
{
    m_ShieldSlots.SetSlot(0, a_Item);
}
 
 
 
 
 
void cInventory::SetEquippedItem(const cItem & a_Item)
{
    SetHotbarSlot(GetEquippedSlotNum(), a_Item);
}
 
 
 
 
 
void cInventory::SendEquippedSlot()
{
    int EquippedSlotNum = cInventory::invArmorCount + cInventory::invInventoryCount + GetEquippedSlotNum();
    SendSlot(EquippedSlotNum);
}
 
 
 
 
 
const cItem & cInventory::GetSlot(int a_SlotNum) const
{
    if ((a_SlotNum < 0) || (a_SlotNum >= invNumSlots))
    {
        LOGWARNING("%s: requesting an invalid slot index: %d out of %d. Returning the first inventory slot instead.", __FUNCTION__, a_SlotNum, invNumSlots - 1);
        return m_InventorySlots.GetSlot(0);
    }
    int GridSlotNum = 0;
    const cItemGrid * Grid = GetGridForSlotNum(a_SlotNum, GridSlotNum);
    if (Grid == nullptr)
    {
        // Something went wrong, but we don't know what. We must return a value, so return the first inventory slot
        LOGWARNING("%s(%d): requesting an invalid ItemGrid, returning the first inventory slot instead.", __FUNCTION__, a_SlotNum);
        return m_InventorySlots.GetSlot(0);
    }
    return Grid->GetSlot(GridSlotNum);
}
 
 
 
 
 
const cItem & cInventory::GetArmorSlot(int a_ArmorSlotNum) const
{
    if ((a_ArmorSlotNum < 0) || (a_ArmorSlotNum >= invArmorCount))
    {
        LOGWARNING("%s: requesting an invalid slot index: %d out of %d. Returning the first one instead", __FUNCTION__, a_ArmorSlotNum, invArmorCount - 1);
        return m_ArmorSlots.GetSlot(0);
    }
    return m_ArmorSlots.GetSlot(a_ArmorSlotNum);
}
 
 
 
 
 
const cItem & cInventory::GetInventorySlot(int a_InventorySlotNum) const
{
    if ((a_InventorySlotNum < 0) || (a_InventorySlotNum >= invInventoryCount))
    {
        LOGWARNING("%s: requesting an invalid slot index: %d out of %d. Returning the first one instead", __FUNCTION__, a_InventorySlotNum, invInventoryCount - 1);
        return m_InventorySlots.GetSlot(0);
    }
    return m_InventorySlots.GetSlot(a_InventorySlotNum);
}
 
 
 
 
 
const cItem & cInventory::GetHotbarSlot(int a_SlotNum) const
{
    if ((a_SlotNum < 0) || (a_SlotNum >= invHotbarCount))
    {
        LOGWARNING("%s: requesting an invalid slot index: %d out of %d. Returning the first one instead", __FUNCTION__, a_SlotNum, invHotbarCount - 1);
        return m_HotbarSlots.GetSlot(0);
    }
    return m_HotbarSlots.GetSlot(a_SlotNum);
}
 
 
 
 
 
const cItem & cInventory::GetShieldSlot() const
{
    return m_ShieldSlots.GetSlot(0);
}
 
 
 
 
 
const cItem & cInventory::GetEquippedItem(void) const
{
    return GetHotbarSlot(m_EquippedSlotNum);
}
 
 
 
 
 
void cInventory::SetEquippedSlotNum(int a_SlotNum)
{
    if ((a_SlotNum < 0) || (a_SlotNum >= invHotbarCount))
    {
        LOGWARNING("%s: requesting invalid slot index: %d out of %d. Setting 0 instead.", __FUNCTION__, a_SlotNum, invHotbarCount - 1);
        m_EquippedSlotNum = 0;
    }
    else
    {
        m_EquippedSlotNum = a_SlotNum;
    }
}
 
 
 
 
 
bool cInventory::DamageEquippedItem(short a_Amount)
{
    return DamageItem(invHotbarOffset + m_EquippedSlotNum, a_Amount);
}
 
 
 
 
 
char cInventory::ChangeSlotCount(int a_SlotNum, char a_AddToCount)
{
    int GridSlotNum = 0;
    cItemGrid * Grid = GetGridForSlotNum(a_SlotNum, GridSlotNum);
    if (Grid == nullptr)
    {
        LOGWARNING("%s: invalid slot number, expected 0 .. %d, got %d; ignoring", __FUNCTION__, invNumSlots, a_SlotNum);
        return -1;
    }
    return Grid->ChangeSlotCount(GridSlotNum, a_AddToCount);
}
 
 
 
 
 
bool cInventory::DamageItem(int a_SlotNum, short a_Amount)
{
    if ((a_SlotNum < 0) || (a_SlotNum >= invNumSlots))
    {
        LOGWARNING("%s: requesting an invalid slot index: %d out of %d", __FUNCTION__, a_SlotNum, invNumSlots - 1);
        return false;
    }
    if (a_Amount <= 0)
    {
        return false;
    }
 
    int GridSlotNum = 0;
    cItemGrid * Grid = GetGridForSlotNum(a_SlotNum, GridSlotNum);
    if (Grid == nullptr)
    {
        LOGWARNING("%s(%d, %d): requesting an invalid grid, ignoring.", __FUNCTION__, a_SlotNum, a_Amount);
        return false;
    }
    if (!Grid->DamageItem(GridSlotNum, a_Amount))
    {
        // The item has been damaged, but did not break yet
        SendSlot(a_SlotNum);
        return false;
    }
 
    // The item has broken, remove it:
    Grid->EmptySlot(GridSlotNum);
    return true;
}
 
 
 
 
 
void cInventory::CopyToItems(cItems & a_Items)
{
    m_ArmorSlots.CopyToItems(a_Items);
    m_InventorySlots.CopyToItems(a_Items);
    m_HotbarSlots.CopyToItems(a_Items);
}
 
 
 
 
 
void cInventory::SendSlot(int a_SlotNum)
{
    cItem Item(GetSlot(a_SlotNum));
    if (Item.IsEmpty())
    {
        // Sanitize items that are not completely empty (ie. count == 0, but type != empty)
        Item.Empty();
    }
    m_Owner.GetClientHandle()->SendInventorySlot(0, static_cast<short>(a_SlotNum + 5), Item);  // Slots in the client are numbered "+ 5" because of crafting grid and result
}
 
 
 
 
 
/*
int cInventory::MoveItem(short a_ItemType, short a_ItemDamage, int a_Count, int a_BeginSlot, int a_EndSlot)
{
    int res = 0;
    for (int i = a_BeginSlot; i <= a_EndSlot; i++)
    {
        if (
            m_Slots[i].IsEmpty() ||
            ((m_Slots[i].m_ItemType == a_ItemType) && (m_Slots[i].m_ItemDamage == a_ItemDamage))
        )
        {
            int MaxCount = ItemHandler(a_ItemType)->GetMaxStackSize();
            ASSERT(m_Slots[i].m_ItemCount <= MaxCount);
            int NumToMove = std::min(a_Count, MaxCount - m_Slots[i].m_ItemCount);
            m_Slots[i].m_ItemCount += NumToMove;
            m_Slots[i].m_ItemDamage = a_ItemDamage;
            m_Slots[i].m_ItemType = a_ItemType;
            SendSlot(i);
            res += NumToMove;
            a_Count -= NumToMove;
            if (a_Count <= 0)
            {
                // No more items to distribute
                return res;
            }
        }
    }  // for i - m_Slots[]
    // No more space to distribute to
    return res;
}
*/
 
 
 
 
 
int cInventory::ArmorSlotNumToEntityEquipmentID(short a_ArmorSlotNum)
{
    switch (a_ArmorSlotNum)
    {
        case 0: return 4;  // Helmet
        case 1: return 3;  // Chestplate
        case 2: return 2;  // Leggings
        case 3: return 1;  // Boots
    }
    LOGWARN("%s: invalid armor slot number: %d", __FUNCTION__, a_ArmorSlotNum);
    return 0;
}
 
 
 
 
 
#if 0
bool cInventory::AddToBar(cItem & a_Item, const int a_Offset, const int a_Size, bool * a_bChangedSlots, int a_Mode /* = 0 */)
{
    // Fill already present stacks
    if (a_Mode < 2)
    {
        int MaxStackSize = cItemHandler::GetItemHandler(a_Item.m_ItemType)->GetMaxStackSize();
        for (int i = 0; i < a_Size; i++)
        {
            if (
                (m_Slots[i + a_Offset].m_ItemType == a_Item.m_ItemType) &&
                (m_Slots[i + a_Offset].m_ItemCount < MaxStackSize) &&
                (m_Slots[i + a_Offset].m_ItemDamage == a_Item.m_ItemDamage)
            )
            {
                int NumFree = MaxStackSize - m_Slots[i + a_Offset].m_ItemCount;
                if (NumFree >= a_Item.m_ItemCount)
                {
 
                    // printf("1. Adding %i items ( free: %i)\n", a_Item.m_ItemCount, NumFree);
                    m_Slots[i + a_Offset].m_ItemCount += a_Item.m_ItemCount;
                    a_Item.m_ItemCount = 0;
                    a_bChangedSlots[i + a_Offset] = true;
                    break;
                }
                else
                {
                    // printf("2. Adding %i items\n", NumFree);
                    m_Slots[i + a_Offset].m_ItemCount += (char)NumFree;
                    a_Item.m_ItemCount -= (char)NumFree;
                    a_bChangedSlots[i + a_Offset] = true;
                }
            }
        }
    }
 
    if (a_Mode > 0)
    {
        // If we got more left, find first empty slot
        for (int i = 0; (i < a_Size) && (a_Item.m_ItemCount > 0); i++)
        {
            if (m_Slots[i + a_Offset].m_ItemType == -1)
            {
                m_Slots[i + a_Offset] = a_Item;
                a_Item.m_ItemCount = 0;
                a_bChangedSlots[i + a_Offset] = true;
            }
        }
    }
 
    return true;
}
#endif
 
 
 
 
 
void cInventory::UpdateItems(void)
{
    const cItem & Slot = GetEquippedItem();
    if (!Slot.IsEmpty())
    {
        Slot.GetHandler().OnUpdate(m_Owner.GetWorld(), &m_Owner, Slot);
    }
}
 
 
 
 
 
void cInventory::SaveToJson(Json::Value & a_Value)
{
    // The JSON originally included the 4 crafting slots and the result, so we have to put empty items there, too:
    cItem EmptyItem;
    Json::Value EmptyItemJson;
    EmptyItem.GetJson(EmptyItemJson);
    for (int i = 0; i < 5; i++)
    {
        a_Value.append(EmptyItemJson);
    }
 
    // The 4 armor slots follow:
    for (int i = 0; i < invArmorCount; i++)
    {
        Json::Value JSON_Item;
        m_ArmorSlots.GetSlot(i).GetJson(JSON_Item);
        a_Value.append(JSON_Item);
    }
 
    // Next comes the main inventory:
    for (int i = 0; i < invInventoryCount; i++)
    {
        Json::Value JSON_Item;
        m_InventorySlots.GetSlot(i).GetJson(JSON_Item);
        a_Value.append(JSON_Item);
    }
 
    // The hotbar:
    for (int i = 0; i < invHotbarCount; i++)
    {
        Json::Value JSON_Item;
        m_HotbarSlots.GetSlot(i).GetJson(JSON_Item);
        a_Value.append(JSON_Item);
    }
 
    // Shield slot is the last
    Json::Value JSON_Item;
    m_ShieldSlots.GetSlot(0).GetJson(JSON_Item);
    a_Value.append(JSON_Item);
}
 
 
 
 
 
bool cInventory::LoadFromJson(Json::Value & a_Value)
{
    int SlotIdx = 0;
 
    for (Json::Value::iterator itr = a_Value.begin(); itr != a_Value.end(); ++itr, SlotIdx++)
    {
        cItem Item;
        Item.FromJson(*itr);
 
        // The JSON originally included the 4 crafting slots and the result slot, so we need to skip the first 5 items:
        if (SlotIdx < 5)
        {
            continue;
        }
 
        // If we loaded all the slots, stop now, even if the JSON has more:
        if (SlotIdx - 5 >= invNumSlots)
        {
            break;
        }
 
        int GridSlotNum = 0;
        cItemGrid * Grid = GetGridForSlotNum(SlotIdx - 5, GridSlotNum);
        ASSERT(Grid != nullptr);
        Grid->SetSlot(GridSlotNum, Item);
    }  // for itr - a_Value[]
    return true;
}
 
 
 
 
 
const cItemGrid * cInventory::GetGridForSlotNum(int a_SlotNum, int & a_GridSlotNum) const
{
    ASSERT(a_SlotNum >= 0);
 
    if (a_SlotNum < invArmorCount)
    {
        a_GridSlotNum = a_SlotNum;
        return &m_ArmorSlots;
    }
    a_SlotNum -= invArmorCount;
    if (a_SlotNum < invInventoryCount)
    {
        a_GridSlotNum = a_SlotNum;
        return &m_InventorySlots;
    }
    a_SlotNum -= invInventoryCount;
    if (a_SlotNum < invHotbarCount)
    {
        a_GridSlotNum = a_SlotNum;
        return &m_HotbarSlots;
    }
    a_GridSlotNum = a_SlotNum - invHotbarCount;
    return &m_ShieldSlots;
}
 
 
 
 
 
cItemGrid * cInventory::GetGridForSlotNum(int a_SlotNum, int & a_GridSlotNum)
{
    ASSERT(a_SlotNum >= 0);
 
    if (a_SlotNum < invArmorCount)
    {
        a_GridSlotNum = a_SlotNum;
        return &m_ArmorSlots;
    }
    a_SlotNum -= invArmorCount;
    if (a_SlotNum < invInventoryCount)
    {
        a_GridSlotNum = a_SlotNum;
        return &m_InventorySlots;
    }
    a_SlotNum -= invInventoryCount;
    if (a_SlotNum < invHotbarCount)
    {
        a_GridSlotNum = a_SlotNum;
        return &m_HotbarSlots;
    }
    a_GridSlotNum = a_SlotNum - invHotbarCount;
    return &m_ShieldSlots;
}
 
 
 
 
 
void cInventory::OnSlotChanged(cItemGrid * a_ItemGrid, int a_SlotNum)
{
    // Send the neccessary updates to whoever needs them
 
    if (!m_Owner.IsTicking())
    {
        // Owner is not (yet) valid, skip for now
        return;
    }
 
    // Armor update needs broadcast to other players:
    cWorld * World = m_Owner.GetWorld();
    if ((a_ItemGrid == &m_ArmorSlots) && (World != nullptr))
    {
        World->BroadcastEntityEquipment(
            m_Owner, static_cast<short>(ArmorSlotNumToEntityEquipmentID(static_cast<short>(a_SlotNum))),
            m_ArmorSlots.GetSlot(a_SlotNum), m_Owner.GetClientHandle()
        );
    }
 
    // Broadcast the Equipped Item, if the Slot is changed.
    if ((a_ItemGrid == &m_HotbarSlots) && (m_EquippedSlotNum == a_SlotNum))
    {
        m_Owner.GetWorld()->BroadcastEntityEquipment(m_Owner, 0, GetEquippedItem(), m_Owner.GetClientHandle());
    }
 
    // Convert the grid-local a_SlotNum to our global SlotNum:
    int Base = 0;
    if (a_ItemGrid == &m_ArmorSlots)
    {
        Base = invArmorOffset;
    }
    else if (a_ItemGrid == &m_InventorySlots)
    {
        Base = invInventoryOffset;
    }
    else if (a_ItemGrid == &m_HotbarSlots)
    {
        Base = invHotbarOffset;
    }
    else if (a_ItemGrid == &m_ShieldSlots)
    {
        Base = invShieldOffset;
    }
    else
    {
        ASSERT(!"Unknown ItemGrid calling OnSlotChanged()");
        return;
    }
 
    SendSlot(Base + a_SlotNum);
}