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implement 4 items on belt tile

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mlangkabel
2026-05-01 21:19:07 +02:00
parent 0ce7cd7ae8
commit b30addab3d
3 changed files with 204 additions and 243 deletions
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387
src/lib/sim/BeltSystem.cpp
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@@ -66,7 +66,6 @@ void BeltSystem::placeSplitter(QPoint tile, Rotation outputA, Rotation outputB)
st.outputA = outputA;
st.outputB = outputB;
st.nextOutputIsA = true;
st.backDir = Rotation::North; // irrelevant until back is set
m_splitters[key(tile)] = st;
}
@@ -211,10 +210,10 @@ bool BeltSystem::tryPutItem(QPoint tile, Item item, Rotation fromDir)
m_splitters.find(key(tile));
if (splIt != m_splitters.end())
{
if (!splIt->second.back)
if (splIt->second.back.size() < 2)
{
splIt->second.back = BeltItemSlot{item, 0.0};
splIt->second.backDir = fromDir;
splIt->second.back.push_back(BeltItemSlot{item, 0.0});
splIt->second.backDir.push_back(fromDir);
return true;
}
return false;
@@ -224,15 +223,9 @@ bool BeltSystem::tryPutItem(QPoint tile, Item item, Rotation fromDir)
m_tunnelEntries.find(key(tile));
if (teIt != m_tunnelEntries.end())
{
TunnelEntryTile& te = teIt->second;
if (!te.front)
if (teIt->second.itemSlots.size() < 4)
{
te.front = BeltItemSlot{item, 0.0};
return true;
}
if (!te.back)
{
te.back = BeltItemSlot{item, 0.0};
teIt->second.itemSlots.push_back(BeltItemSlot{item, 0.0});
return true;
}
return false;
@@ -251,11 +244,10 @@ std::optional<Item> BeltSystem::tryTakeItem(Port port)
return std::nullopt;
}
BeltTile& bt = beltIt->second;
if (bt.front && bt.front->progress >= 1.0)
if (!bt.itemSlots.empty() && bt.itemSlots.front().progress >= 1.0)
{
const Item taken = bt.front->item;
bt.front = bt.back;
bt.back = std::nullopt;
const Item taken = bt.itemSlots.front().item;
bt.itemSlots.erase(bt.itemSlots.begin());
return taken;
}
return std::nullopt;
@@ -285,11 +277,11 @@ std::optional<Item> BeltSystem::tryTakeItem(Port port)
if (txIt != m_tunnelExits.end())
{
TunnelExitTile& tx = txIt->second;
if (tx.direction == port.direction && tx.front && tx.front->progress >= 1.0)
if (tx.direction == port.direction && !tx.itemSlots.empty()
&& tx.itemSlots.front().progress >= 1.0)
{
const Item taken = tx.front->item;
tx.front = tx.back;
tx.back = std::nullopt;
const Item taken = tx.itemSlots.front().item;
tx.itemSlots.erase(tx.itemSlots.begin());
return taken;
}
}
@@ -308,9 +300,9 @@ std::optional<ItemType> BeltSystem::peekItem(Port port) const
return std::nullopt;
}
const BeltTile& bt = beltIt->second;
if (bt.front && bt.front->progress >= 1.0)
if (!bt.itemSlots.empty() && bt.itemSlots.front().progress >= 1.0)
{
return bt.front->item.type;
return bt.itemSlots.front().item.type;
}
return std::nullopt;
}
@@ -335,9 +327,10 @@ std::optional<ItemType> BeltSystem::peekItem(Port port) const
if (txIt != m_tunnelExits.end())
{
const TunnelExitTile& tx = txIt->second;
if (tx.direction == port.direction && tx.front && tx.front->progress >= 1.0)
if (tx.direction == port.direction && !tx.itemSlots.empty()
&& tx.itemSlots.front().progress >= 1.0)
{
return tx.front->item.type;
return tx.itemSlots.front().item.type;
}
}
@@ -355,14 +348,14 @@ void BeltSystem::clearTiles(const std::vector<QPoint>& tiles)
const std::map<std::pair<int, int>, BeltTile>::iterator bIt = m_belts.find(key(tile));
if (bIt != m_belts.end())
{
bIt->second.front = std::nullopt;
bIt->second.back = std::nullopt;
bIt->second.itemSlots.clear();
}
const std::map<std::pair<int, int>, SplitterTile>::iterator sIt = m_splitters.find(key(tile));
if (sIt != m_splitters.end())
{
sIt->second.back = std::nullopt;
sIt->second.back.clear();
sIt->second.backDir.clear();
sIt->second.frontA = std::nullopt;
sIt->second.frontB = std::nullopt;
}
@@ -371,8 +364,7 @@ void BeltSystem::clearTiles(const std::vector<QPoint>& tiles)
m_tunnelEntries.find(key(tile));
if (teIt != m_tunnelEntries.end())
{
teIt->second.front = std::nullopt;
teIt->second.back = std::nullopt;
teIt->second.itemSlots.clear();
for (TunnelLink& link : m_tunnelLinks)
{
if (link.entryTile == tile)
@@ -386,8 +378,7 @@ void BeltSystem::clearTiles(const std::vector<QPoint>& tiles)
m_tunnelExits.find(key(tile));
if (txIt != m_tunnelExits.end())
{
txIt->second.front = std::nullopt;
txIt->second.back = std::nullopt;
txIt->second.itemSlots.clear();
for (TunnelLink& link : m_tunnelLinks)
{
if (link.exitTile == tile)
@@ -419,33 +410,26 @@ void BeltSystem::advanceProgress()
{
BeltTile& bt = it->second;
if (bt.front)
for (std::size_t i = 0; i < bt.itemSlots.size(); ++i)
{
bt.front->progress += m_progressPerTick;
if (bt.front->progress > 1.0)
bt.itemSlots[i].progress += m_progressPerTick;
// Absolute cap: slot i cannot exceed 1.0 - i * 0.25.
const double absoluteCap = 1.0 - i * 0.25;
if (bt.itemSlots[i].progress > absoluteCap)
{
bt.front->progress = 1.0;
bt.itemSlots[i].progress = absoluteCap;
}
}
if (bt.back)
{
bt.back->progress += m_progressPerTick;
// Back must not overtake front.
if (bt.front && bt.back->progress >= bt.front->progress)
// Gap constraint: must stay 0.25 behind the slot ahead.
if (i > 0)
{
bt.back->progress = bt.front->progress - m_progressPerTick;
if (bt.back->progress < 0.0)
const double gapCap = bt.itemSlots[i - 1].progress - 0.25;
if (bt.itemSlots[i].progress > gapCap)
{
bt.back->progress = 0.0;
bt.itemSlots[i].progress = (gapCap < 0.0 ? 0.0 : gapCap);
}
}
if (bt.back->progress > 0.5)
{
bt.back->progress = 0.5;
}
}
}
@@ -454,12 +438,26 @@ void BeltSystem::advanceProgress()
{
SplitterTile& st = it->second;
if (st.back)
for (std::size_t i = 0; i < st.back.size(); ++i)
{
st.back->progress += m_progressPerTick;
if (st.back->progress > 0.5)
st.back[i].progress += m_progressPerTick;
const double absoluteCap = 0.5 - i * 0.25;
if (st.back[i].progress > absoluteCap)
{
st.back->progress = 0.5;
st.back[i].progress = absoluteCap;
}
if (i > 0)
{
const double gapCap = st.back[i - 1].progress - 0.25;
if (gapCap < 0.0)
{
st.back[i].progress = 0.0;
}
else if (st.back[i].progress > gapCap)
{
st.back[i].progress = gapCap;
}
}
}
@@ -490,29 +488,23 @@ void BeltSystem::advanceTunnelProgress()
{
TunnelEntryTile& te = it->second;
if (te.front)
for (std::size_t i = 0; i < te.itemSlots.size(); ++i)
{
te.front->progress += m_progressPerTick;
if (te.front->progress > 1.0)
{
te.front->progress = 1.0;
}
}
te.itemSlots[i].progress += m_progressPerTick;
if (te.back)
{
te.back->progress += m_progressPerTick;
if (te.front && te.back->progress >= te.front->progress)
const double absoluteCap = 1.0 - i * 0.25;
if (te.itemSlots[i].progress > absoluteCap)
{
te.back->progress = te.front->progress - m_progressPerTick;
if (te.back->progress < 0.0)
{
te.back->progress = 0.0;
}
te.itemSlots[i].progress = absoluteCap;
}
if (te.back->progress > 0.5)
if (i > 0)
{
te.back->progress = 0.5;
const double gapCap = te.itemSlots[i - 1].progress - 0.25;
if (te.itemSlots[i].progress > gapCap)
{
te.itemSlots[i].progress = (gapCap < 0.0 ? 0.0 : gapCap);
}
}
}
}
@@ -522,29 +514,23 @@ void BeltSystem::advanceTunnelProgress()
{
TunnelExitTile& tx = it->second;
if (tx.front)
for (std::size_t i = 0; i < tx.itemSlots.size(); ++i)
{
tx.front->progress += m_progressPerTick;
if (tx.front->progress > 1.0)
{
tx.front->progress = 1.0;
}
}
tx.itemSlots[i].progress += m_progressPerTick;
if (tx.back)
{
tx.back->progress += m_progressPerTick;
if (tx.front && tx.back->progress >= tx.front->progress)
const double absoluteCap = 1.0 - i * 0.25;
if (tx.itemSlots[i].progress > absoluteCap)
{
tx.back->progress = tx.front->progress - m_progressPerTick;
if (tx.back->progress < 0.0)
{
tx.back->progress = 0.0;
}
tx.itemSlots[i].progress = absoluteCap;
}
if (tx.back->progress > 0.5)
if (i > 0)
{
tx.back->progress = 0.5;
const double gapCap = tx.itemSlots[i - 1].progress - 0.25;
if (tx.itemSlots[i].progress > gapCap)
{
tx.itemSlots[i].progress = (gapCap < 0.0 ? 0.0 : gapCap);
}
}
}
}
@@ -561,7 +547,7 @@ void BeltSystem::advanceTunnelProgress()
}
if (i > 0)
{
const double maxProgress = link.items[i - 1].progress - 0.5;
const double maxProgress = link.items[i - 1].progress - 0.25;
if (ti.progress > maxProgress)
{
ti.progress = maxProgress;
@@ -582,7 +568,7 @@ void BeltSystem::moveItemsToNextTile()
it != m_belts.end(); ++it)
{
BeltTile& bt = it->second;
if (!bt.front || bt.front->progress < 1.0)
if (bt.itemSlots.empty() || bt.itemSlots.front().progress < 1.0)
{
continue;
}
@@ -595,39 +581,31 @@ void BeltSystem::moveItemsToNextTile()
if (nextBelt != m_belts.end())
{
if (tryPlaceOnBelt(next, bt.front->item))
if (tryPlaceOnBelt(next, bt.itemSlots.front().item))
{
bt.front = bt.back;
bt.back = std::nullopt;
bt.itemSlots.erase(bt.itemSlots.begin());
}
// else: next belt is full — item stays blocked at progress 1.0.
}
else if (nextSplitter != m_splitters.end())
{
if (!nextSplitter->second.back)
if (nextSplitter->second.back.size() < 2)
{
nextSplitter->second.back = BeltItemSlot{bt.front->item, 0.0};
nextSplitter->second.backDir = bt.direction;
bt.front = bt.back;
bt.back = std::nullopt;
nextSplitter->second.back.push_back(BeltItemSlot{bt.itemSlots.front().item, 0.0});
nextSplitter->second.backDir.push_back(bt.direction);
bt.itemSlots.erase(bt.itemSlots.begin());
}
}
else
{
const std::map<std::pair<int, int>, TunnelEntryTile>::iterator nextEntry =
m_tunnelEntries.find(key(next));
if (nextEntry != m_tunnelEntries.end() && !nextEntry->second.back)
if (nextEntry != m_tunnelEntries.end()
&& nextEntry->second.itemSlots.size() < 4)
{
if (!nextEntry->second.front)
{
nextEntry->second.front = BeltItemSlot{bt.front->item, 0.0};
}
else
{
nextEntry->second.back = BeltItemSlot{bt.front->item, 0.0};
}
bt.front = bt.back;
bt.back = std::nullopt;
nextEntry->second.itemSlots.push_back(
BeltItemSlot{bt.itemSlots.front().item, 0.0});
bt.itemSlots.erase(bt.itemSlots.begin());
}
}
}
@@ -663,17 +641,16 @@ void BeltSystem::moveItemsToNextTile()
it != m_tunnelExits.end(); ++it)
{
TunnelExitTile& tx = it->second;
if (!tx.front || tx.front->progress < 1.0)
if (tx.itemSlots.empty() || tx.itemSlots.front().progress < 1.0)
{
continue;
}
const QPoint here = QPoint(it->first.first, it->first.second);
const QPoint next = adjacentTile(here, tx.direction);
if (tryPushToTile(next, tx.front->item, tx.direction))
if (tryPushToTile(next, tx.itemSlots.front().item, tx.direction))
{
tx.front = tx.back;
tx.back = std::nullopt;
tx.itemSlots.erase(tx.itemSlots.begin());
}
}
}
@@ -688,23 +665,22 @@ void BeltSystem::moveTunnelItems()
if (teIt != m_tunnelEntries.end())
{
TunnelEntryTile& te = teIt->second;
if (te.front && te.front->progress >= 1.0)
if (!te.itemSlots.empty() && te.itemSlots.front().progress >= 1.0)
{
const bool canEnter = link.items.empty()
|| link.items.back().progress >= 0.5;
|| link.items.back().progress >= 0.25;
if (canEnter)
{
TunnelTransitItem ti;
ti.item = te.front->item;
ti.item = te.itemSlots.front().item;
ti.progress = 0.0;
link.items.push_back(ti);
te.front = te.back;
te.back = std::nullopt;
te.itemSlots.erase(te.itemSlots.begin());
}
}
}
// Transit front → exit back
// Transit front → exit
if (!link.items.empty() && link.items.front().progress >= link.length)
{
const std::map<std::pair<int, int>, TunnelExitTile>::iterator txIt =
@@ -712,14 +688,9 @@ void BeltSystem::moveTunnelItems()
if (txIt != m_tunnelExits.end())
{
TunnelExitTile& tx = txIt->second;
if (!tx.back && !tx.front)
if (tx.itemSlots.size() < 4)
{
tx.front = BeltItemSlot{link.items.front().item, 0.0};
link.items.erase(link.items.begin());
}
else if (!tx.back && tx.front)
{
tx.back = BeltItemSlot{link.items.front().item, 0.0};
tx.itemSlots.push_back(BeltItemSlot{link.items.front().item, 0.0});
link.items.erase(link.items.begin());
}
}
@@ -733,24 +704,26 @@ void BeltSystem::routeSplitterItems()
it != m_splitters.end(); ++it)
{
SplitterTile& st = it->second;
if (!st.back || st.back->progress < 0.5)
if (st.back.empty() || st.back.front().progress < 0.5)
{
continue;
}
const Item& item = st.back->item;
const Item& item = st.back.front().item;
const bool matchesA = st.filterA.empty() ||
std::find(st.filterA.begin(), st.filterA.end(), item.type) != st.filterA.end();
const bool matchesB = st.filterB.empty() ||
std::find(st.filterB.begin(), st.filterB.end(), item.type) != st.filterB.end();
bool routed = false;
if (matchesA && !matchesB)
{
if (!st.frontA)
{
st.frontA = BeltItemSlot{item, 0.0};
st.back = std::nullopt;
routed = true;
}
}
else if (matchesB && !matchesA)
@@ -758,7 +731,7 @@ void BeltSystem::routeSplitterItems()
if (!st.frontB)
{
st.frontB = BeltItemSlot{item, 0.0};
st.back = std::nullopt;
routed = true;
}
}
else if (matchesA && matchesB)
@@ -769,30 +742,36 @@ void BeltSystem::routeSplitterItems()
if (preferA && !st.frontA)
{
st.frontA = BeltItemSlot{item, 0.0};
st.back = std::nullopt;
st.nextOutputIsA = false;
routed = true;
}
else if (!preferA && !st.frontB)
{
st.frontB = BeltItemSlot{item, 0.0};
st.back = std::nullopt;
st.nextOutputIsA = true;
routed = true;
}
else if (preferA && !st.frontB)
{
// Preferred (A) is full — fall back to B; nextOutputIsA stays.
st.frontB = BeltItemSlot{item, 0.0};
st.back = std::nullopt;
routed = true;
}
else if (!preferA && !st.frontA)
{
// Preferred (B) is full — fall back to A; nextOutputIsA stays.
st.frontA = BeltItemSlot{item, 0.0};
st.back = std::nullopt;
routed = true;
}
// else both fronts occupied — back stays.
}
// else (!matchesA && !matchesB): stall — back stays.
if (routed)
{
st.back.erase(st.back.begin());
st.backDir.erase(st.backDir.begin());
}
}
}
@@ -805,24 +784,12 @@ bool BeltSystem::tryPlaceOnBelt(QPoint tile, Item item)
}
BeltTile& bt = it->second;
if (!bt.front)
if (bt.itemSlots.size() < 4)
{
bt.front = BeltItemSlot{item, 0.0};
bt.itemSlots.push_back(BeltItemSlot{item, 0.0});
return true;
}
if (!bt.back)
{
bt.back = BeltItemSlot{item, 0.0};
// Ensure ordering invariant: front has higher progress.
if (bt.back->progress > bt.front->progress)
{
std::swap(bt.front, bt.back);
}
return true;
}
return false; // both slots occupied
return false; // all slots occupied
}
bool BeltSystem::tryPushToTile(QPoint dest, Item item, Rotation fromDir)
@@ -836,10 +803,10 @@ bool BeltSystem::tryPushToTile(QPoint dest, Item item, Rotation fromDir)
m_splitters.find(key(dest));
if (splIt != m_splitters.end())
{
if (!splIt->second.back)
if (splIt->second.back.size() < 2)
{
splIt->second.back = BeltItemSlot{item, 0.0};
splIt->second.backDir = fromDir;
splIt->second.back.push_back(BeltItemSlot{item, 0.0});
splIt->second.backDir.push_back(fromDir);
return true;
}
return false;
@@ -849,15 +816,9 @@ bool BeltSystem::tryPushToTile(QPoint dest, Item item, Rotation fromDir)
m_tunnelEntries.find(key(dest));
if (teIt != m_tunnelEntries.end())
{
TunnelEntryTile& te = teIt->second;
if (!te.front)
if (teIt->second.itemSlots.size() < 4)
{
te.front = BeltItemSlot{item, 0.0};
return true;
}
if (!te.back)
{
te.back = BeltItemSlot{item, 0.0};
teIt->second.itemSlots.push_back(BeltItemSlot{item, 0.0});
return true;
}
return false;
@@ -867,15 +828,9 @@ bool BeltSystem::tryPushToTile(QPoint dest, Item item, Rotation fromDir)
m_tunnelExits.find(key(dest));
if (txIt != m_tunnelExits.end())
{
TunnelExitTile& tx = txIt->second;
if (!tx.front)
if (txIt->second.itemSlots.size() < 4)
{
tx.front = BeltItemSlot{item, 0.0};
return true;
}
if (!tx.back)
{
tx.back = BeltItemSlot{item, 0.0};
txIt->second.itemSlots.push_back(BeltItemSlot{item, 0.0});
return true;
}
return false;
@@ -901,19 +856,12 @@ void BeltSystem::forEachVisualItem(QRect viewportTiles,
const BeltTile& bt = entry.second;
if (bt.front)
// Render least-progressed first (bottom) → most-progressed last (top).
for (int i = static_cast<int>(bt.itemSlots.size()) - 1; i >= 0; --i)
{
VisualItem vi;
vi.type = bt.front->item.type;
vi.worldPos = slotWorldPos(tile, bt.direction, bt.front->progress);
visit(vi);
}
if (bt.back)
{
VisualItem vi;
vi.type = bt.back->item.type;
vi.worldPos = slotWorldPos(tile, bt.direction, bt.back->progress);
vi.type = bt.itemSlots[i].item.type;
vi.worldPos = slotWorldPos(tile, bt.direction, bt.itemSlots[i].progress);
visit(vi);
}
}
@@ -928,28 +876,51 @@ void BeltSystem::forEachVisualItem(QRect viewportTiles,
const SplitterTile& st = entry.second;
if (st.back)
// Unassigned items: least-progressed first (bottom), then higher-progressed (top).
for (int i = static_cast<int>(st.back.size()) - 1; i >= 0; --i)
{
VisualItem vi;
vi.type = st.back->item.type;
vi.worldPos = slotWorldPos(tile, st.backDir, st.back->progress);
vi.type = st.back[i].item.type;
vi.worldPos = slotWorldPos(tile, st.backDir[i], st.back[i].progress);
visit(vi);
}
if (st.frontA)
// Output-slot items rendered on top of unassigned, in clockwise order from East.
// East=0, South=1, West=2, North=3 — lower rank rendered first (bottom).
auto clockwiseRank = [](Rotation r) -> int
{
VisualItem vi;
vi.type = st.frontA->item.type;
vi.worldPos = slotWorldPos(tile, st.outputA, st.frontA->progress);
visit(vi);
}
switch (r)
{
case Rotation::East: return 0;
case Rotation::South: return 1;
case Rotation::West: return 2;
case Rotation::North: return 3;
}
return 0;
};
if (st.frontB)
const bool aBeforeB = clockwiseRank(st.outputA) <= clockwiseRank(st.outputB);
auto renderFront = [&](const std::optional<BeltItemSlot>& slot, Rotation dir)
{
VisualItem vi;
vi.type = st.frontB->item.type;
vi.worldPos = slotWorldPos(tile, st.outputB, st.frontB->progress);
visit(vi);
if (slot)
{
VisualItem vi;
vi.type = slot->item.type;
vi.worldPos = slotWorldPos(tile, dir, slot->progress);
visit(vi);
}
};
if (aBeforeB)
{
renderFront(st.frontA, st.outputA);
renderFront(st.frontB, st.outputB);
}
else
{
renderFront(st.frontB, st.outputB);
renderFront(st.frontA, st.outputA);
}
}
@@ -962,18 +933,11 @@ void BeltSystem::forEachVisualItem(QRect viewportTiles,
}
const TunnelEntryTile& te = entry.second;
if (te.front)
for (int i = static_cast<int>(te.itemSlots.size()) - 1; i >= 0; --i)
{
VisualItem vi;
vi.type = te.front->item.type;
vi.worldPos = slotWorldPos(tile, te.direction, te.front->progress);
visit(vi);
}
if (te.back)
{
VisualItem vi;
vi.type = te.back->item.type;
vi.worldPos = slotWorldPos(tile, te.direction, te.back->progress);
vi.type = te.itemSlots[i].item.type;
vi.worldPos = slotWorldPos(tile, te.direction, te.itemSlots[i].progress);
visit(vi);
}
}
@@ -987,18 +951,11 @@ void BeltSystem::forEachVisualItem(QRect viewportTiles,
}
const TunnelExitTile& tx = entry.second;
if (tx.front)
for (int i = static_cast<int>(tx.itemSlots.size()) - 1; i >= 0; --i)
{
VisualItem vi;
vi.type = tx.front->item.type;
vi.worldPos = slotWorldPos(tile, tx.direction, tx.front->progress);
visit(vi);
}
if (tx.back)
{
VisualItem vi;
vi.type = tx.back->item.type;
vi.worldPos = slotWorldPos(tile, tx.direction, tx.back->progress);
vi.type = tx.itemSlots[i].item.type;
vi.worldPos = slotWorldPos(tile, tx.direction, tx.itemSlots[i].progress);
visit(vi);
}
}

17
src/lib/sim/BeltSystem.h
View File

@@ -123,8 +123,8 @@ private:
struct BeltTile
{
Rotation direction;
std::optional<BeltItemSlot> front; // higher progress; closer to output
std::optional<BeltItemSlot> back; // lower progress; closer to input
// front (highest progress) at index 0; back (just entered) at end. Max 4.
std::vector<BeltItemSlot> itemSlots;
};
struct SplitterTile
@@ -134,8 +134,9 @@ private:
std::vector<ItemType> filterA; // empty = accept all
std::vector<ItemType> filterB;
bool nextOutputIsA; // alternation state
std::optional<BeltItemSlot> back; // progress [0, 0.5]; entering from input belt
Rotation backDir; // direction of the feeding belt (for animation)
// Unassigned items: [0] = routing candidate (higher progress, caps at 0.5). Max 2.
std::vector<BeltItemSlot> back;
std::vector<Rotation> backDir; // feeding belt direction, parallel to back
std::optional<BeltItemSlot> frontA; // progress [0, 1]; routed to outputA
std::optional<BeltItemSlot> frontB; // progress [0, 1]; routed to outputB
};
@@ -144,15 +145,15 @@ private:
{
Rotation direction;
int maxDistance;
std::optional<BeltItemSlot> front;
std::optional<BeltItemSlot> back;
// front (highest progress) at index 0; back at end. Max 4.
std::vector<BeltItemSlot> itemSlots;
};
struct TunnelExitTile
{
Rotation direction;
std::optional<BeltItemSlot> front;
std::optional<BeltItemSlot> back;
// front (highest progress) at index 0; back at end. Max 4.
std::vector<BeltItemSlot> itemSlots;
};
struct TunnelTransitItem