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cuberite-2a/src/Simulator/FireSimulator.cpp

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C++
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#include "Globals.h" // NOTE: MSVC stupidness requires this to be the same across all modules
#include "FireSimulator.h"
#include "../BlockInfo.h"
#include "../World.h"
#include "../Defines.h"
#include "../Chunk.h"
#include "../Root.h"
#include "../Bindings/PluginManager.h"
// Easy switch for turning on debugging logging:
#if 0
#define FIRE_FLOG FLOGD
#else
#define FIRE_FLOG(...)
#endif
#define MAX_CHANCE_REPLACE_FUEL 100000
#define MAX_CHANCE_FLAMMABILITY 100000
// The base chance that in a tick, rain will extinguish a fire block.
#define CHANCE_BASE_RAIN_EXTINGUISH 0.2
// The additional chance, multiplied by the meta of the fire block, that rain
// will extinguish a fire block in a tick.
#define CHANCE_AGE_M_RAIN_EXTINGUISH 0.03
static constexpr Vector3i gCrossCoords[] =
{
{ 1, 0, 0},
{-1, 0, 0},
{ 0, 0, 1},
{ 0, 0, -1},
} ;
static constexpr Vector3i gNeighborCoords[] =
{
{ 1, 0, 0},
{-1, 0, 0},
{ 0, 1, 0},
{ 0, -1, 0},
{ 0, 0, 1},
{ 0, 0, -1},
};
////////////////////////////////////////////////////////////////////////////////
// cFireSimulator:
cFireSimulator::cFireSimulator(cWorld & a_World, cIniFile & a_IniFile) :
cSimulator(a_World)
{
// Read params from the ini file:
m_BurnStepTimeFuel = static_cast<unsigned>(a_IniFile.GetValueSetI("FireSimulator", "BurnStepTimeFuel", 500));
m_BurnStepTimeNonfuel = static_cast<unsigned>(a_IniFile.GetValueSetI("FireSimulator", "BurnStepTimeNonfuel", 100));
m_Flammability = a_IniFile.GetValueSetI("FireSimulator", "Flammability", 50);
m_ReplaceFuelChance = a_IniFile.GetValueSetI("FireSimulator", "ReplaceFuelChance", 50000);
}
void cFireSimulator::SimulateChunk(std::chrono::milliseconds a_Dt, int a_ChunkX, int a_ChunkZ, cChunk * a_Chunk)
{
cCoordWithIntList & Data = a_Chunk->GetFireSimulatorData();
int NumMSecs = static_cast<int>(a_Dt.count());
for (cCoordWithIntList::iterator itr = Data.begin(); itr != Data.end();)
{
Vector3i relPos(itr->x, itr->y, itr->z);
auto blockType = a_Chunk->GetBlock(relPos);
if (!IsAllowedBlock(blockType))
{
// The block is no longer eligible (not a fire block anymore; a player probably placed a block over the fire)
FIRE_FLOG("FS: Removing block {0}", absPos);
itr = Data.erase(itr);
continue;
}
auto BurnsForever = ((relPos.y > 0) && DoesBurnForever(a_Chunk->GetBlock(relPos.addedY(-1))));
auto BlockMeta = a_Chunk->GetMeta(relPos);
auto Raining = std::any_of(std::begin(gCrossCoords), std::end(gCrossCoords), [a_Chunk, relPos](Vector3i cc)
{
auto Adjusted = relPos + cc;
const auto Chunk = a_Chunk->GetRelNeighborChunkAdjustCoords(Adjusted);
if ((Chunk != nullptr) && Chunk->IsValid())
{
return Chunk->IsWeatherWetAt(Adjusted);
}
return false;
});
// Randomly burn out the fire if it is raining:
if (!BurnsForever && Raining && GetRandomProvider().RandBool(CHANCE_BASE_RAIN_EXTINGUISH + (BlockMeta * CHANCE_AGE_M_RAIN_EXTINGUISH)))
{
a_Chunk->SetBlock(relPos, E_BLOCK_AIR, 0);
itr = Data.erase(itr);
continue;
}
// Try to spread the fire:
TrySpreadFire(a_Chunk, relPos);
itr->Data -= NumMSecs;
if (itr->Data >= 0)
{
// Not yet, wait for it longer
++itr;
continue;
}
// FIRE_FLOG("FS: Fire at {0} is stepping", absPos);
// TODO: Add some randomness into this
const auto BurnStep = GetBurnStepTime(a_Chunk, relPos);
if (BurnStep == 0)
{
// Fire has no fuel or ground block, extinguish flame
a_Chunk->SetBlock(relPos, E_BLOCK_AIR, 0);
itr = Data.erase(itr);
continue;
}
// Has the fire burnt out?
if (BlockMeta == 0x0f)
{
// The fire burnt out completely
FIRE_FLOG("FS: Fire at {0} burnt out, removing the fire block", absPos);
a_Chunk->SetBlock(relPos, E_BLOCK_AIR, 0);
RemoveFuelNeighbors(a_Chunk, relPos);
itr = Data.erase(itr);
continue;
}
// Burn out the fire one step by increasing the meta:
if (!BurnsForever)
{
a_Chunk->SetMeta(relPos, BlockMeta + 1);
}
itr->Data = BurnStep;
++itr;
} // for itr - Data[]
}
bool cFireSimulator::IsAllowedBlock(BLOCKTYPE a_BlockType)
{
return (a_BlockType == E_BLOCK_FIRE);
}
bool cFireSimulator::IsFuel(BLOCKTYPE a_BlockType)
{
switch (a_BlockType)
{
case E_BLOCK_PLANKS:
case E_BLOCK_DOUBLE_WOODEN_SLAB:
case E_BLOCK_WOODEN_SLAB:
case E_BLOCK_OAK_WOOD_STAIRS:
case E_BLOCK_SPRUCE_WOOD_STAIRS:
case E_BLOCK_BIRCH_WOOD_STAIRS:
case E_BLOCK_JUNGLE_WOOD_STAIRS:
case E_BLOCK_LEAVES:
case E_BLOCK_NEW_LEAVES:
case E_BLOCK_LOG:
case E_BLOCK_NEW_LOG:
case E_BLOCK_WOOL:
case E_BLOCK_BOOKCASE:
case E_BLOCK_FENCE:
case E_BLOCK_SPRUCE_FENCE:
case E_BLOCK_BIRCH_FENCE:
case E_BLOCK_JUNGLE_FENCE:
case E_BLOCK_DARK_OAK_FENCE:
case E_BLOCK_ACACIA_FENCE:
case E_BLOCK_OAK_FENCE_GATE:
case E_BLOCK_SPRUCE_FENCE_GATE:
case E_BLOCK_BIRCH_FENCE_GATE:
case E_BLOCK_JUNGLE_FENCE_GATE:
case E_BLOCK_DARK_OAK_FENCE_GATE:
case E_BLOCK_ACACIA_FENCE_GATE:
case E_BLOCK_TNT:
case E_BLOCK_VINES:
case E_BLOCK_HAY_BALE:
case E_BLOCK_TALL_GRASS:
case E_BLOCK_BIG_FLOWER:
case E_BLOCK_DANDELION:
case E_BLOCK_FLOWER:
case E_BLOCK_CARPET:
{
return true;
}
}
return false;
}
bool cFireSimulator::DoesBurnForever(BLOCKTYPE a_BlockType)
{
return (a_BlockType == E_BLOCK_NETHERRACK);
}
void cFireSimulator::AddBlock(cChunk & a_Chunk, Vector3i a_Position, BLOCKTYPE a_Block)
{
if (!IsAllowedBlock(a_Block))
{
return;
}
// Check for duplicates:
cFireSimulatorChunkData & ChunkData = a_Chunk.GetFireSimulatorData();
for (cCoordWithIntList::iterator itr = ChunkData.begin(), end = ChunkData.end(); itr != end; ++itr)
{
const Vector3i ItrPos{itr->x, itr->y, itr->z};
if (ItrPos == a_Position)
{
// Block already present, check if burn step should decrease
// This means if fuel is removed, then the fire burns out sooner
const auto NewBurnStep = GetBurnStepTime(&a_Chunk, a_Position);
if (itr->Data > NewBurnStep)
{
FIRE_FLOG("FS: Block lost its fuel at {0}", a_Block);
itr->Data = NewBurnStep;
}
return;
}
} // for itr - ChunkData[]
FIRE_FLOG("FS: Adding block {0}", a_Block);
ChunkData.emplace_back(a_Position.x, a_Position.y, a_Position.z, 100);
}
int cFireSimulator::GetBurnStepTime(cChunk * a_Chunk, Vector3i a_RelPos)
{
bool IsBlockBelowSolid = false;
if (a_RelPos.y > 0)
{
BLOCKTYPE BlockBelow = a_Chunk->GetBlock(a_RelPos.addedY(-1));
if (DoesBurnForever(BlockBelow))
{
// Is burning atop of netherrack, burn forever (re-check in 10 sec)
return 10000;
}
if (IsFuel(BlockBelow))
{
return static_cast<int>(m_BurnStepTimeFuel);
}
IsBlockBelowSolid = cBlockInfo::IsSolid(BlockBelow);
}
for (const auto & cross: gCrossCoords)
{
BLOCKTYPE BlockType;
NIBBLETYPE BlockMeta;
if (a_Chunk->UnboundedRelGetBlock(a_RelPos + cross, BlockType, BlockMeta))
{
if (IsFuel(BlockType))
{
return static_cast<int>(m_BurnStepTimeFuel);
}
}
} // for i - gCrossCoords[]
if (!IsBlockBelowSolid)
{
// Checked through everything, nothing was flammable
// If block below isn't solid, we can't have fire, it would be a non-fueled fire
return 0;
}
return static_cast<int>(m_BurnStepTimeNonfuel);
}
void cFireSimulator::TrySpreadFire(cChunk * a_Chunk, Vector3i a_RelPos)
{
/*
if (GetRandomProvider().RandBool(0.99))
{
// Make the chance to spread 100x smaller
return;
}
*/
for (int x = -1; x <= 1; x++)
{
for (int z = -1; z <= 1; z++)
{
for (int y = 1; y <= 2; y++) // flames spread up one more block than around
{
// No need to check the coords for equality with the parent block,
// it cannot catch fire anyway (because it's not an air block)
if (!GetRandomProvider().RandBool(m_Flammability * (1.0 / MAX_CHANCE_FLAMMABILITY)))
{
continue;
}
// Start the fire in the neighbor a_RelPos + {x, y, z}
auto dstRelPos = a_RelPos + Vector3i{x, y, z};
if (CanStartFireInBlock(a_Chunk, dstRelPos))
{
auto dstAbsPos = a_Chunk->RelativeToAbsolute(dstRelPos);
if (cRoot::Get()->GetPluginManager()->CallHookBlockSpread(m_World, dstAbsPos.x, dstAbsPos.y, dstAbsPos.z, ssFireSpread))
{
return;
}
FIRE_FLOG("FS: Starting new fire at {0}.", dstAbsPos);
a_Chunk->UnboundedRelSetBlock(dstRelPos, E_BLOCK_FIRE, 0);
}
} // for y
} // for z
} // for x
}
void cFireSimulator::RemoveFuelNeighbors(cChunk * a_Chunk, Vector3i a_RelPos)
{
for (auto & coord : gNeighborCoords)
{
BLOCKTYPE BlockType;
auto relPos = a_RelPos + coord;
auto neighbor = a_Chunk->GetRelNeighborChunkAdjustCoords(relPos);
if (neighbor == nullptr)
{
continue;
}
BlockType = neighbor->GetBlock(relPos);
if (!IsFuel(BlockType))
{
continue;
}
auto absPos = neighbor->RelativeToAbsolute(relPos);
if (BlockType == E_BLOCK_TNT)
{
neighbor->SetBlock(relPos, E_BLOCK_AIR, 0);
m_World.SpawnPrimedTNT(Vector3d(absPos) + Vector3d(0.5, 0.5, 0.5)); // 80 ticks to boom
return;
}
bool ShouldReplaceFuel = (GetRandomProvider().RandBool(m_ReplaceFuelChance * (1.0 / MAX_CHANCE_REPLACE_FUEL)));
if (ShouldReplaceFuel && !cRoot::Get()->GetPluginManager()->CallHookBlockSpread(m_World, absPos.x, absPos.y, absPos.z, ssFireSpread))
{
neighbor->SetBlock(relPos, E_BLOCK_FIRE, 0);
}
else
{
neighbor->SetBlock(relPos, E_BLOCK_AIR, 0);
}
} // for i - Coords[]
}
bool cFireSimulator::CanStartFireInBlock(cChunk * a_NearChunk, Vector3i a_RelPos)
{
BLOCKTYPE BlockType;
NIBBLETYPE BlockMeta;
if (!a_NearChunk->UnboundedRelGetBlock(a_RelPos, BlockType, BlockMeta))
{
// The chunk is not accessible
return false;
}
if (BlockType != E_BLOCK_AIR)
{
// Only an air block can be replaced by a fire block
return false;
}
for (const auto & neighbor: gNeighborCoords)
{
if (!a_NearChunk->UnboundedRelGetBlock(a_RelPos + neighbor, BlockType, BlockMeta))
{
// Neighbor inaccessible, skip it while evaluating
continue;
}
if (IsFuel(BlockType))
{
return true;
}
} // for i - Coords[]
return false;
}
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