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// VanillaFluidSimulator.cpp
#include "Globals.h"
#include "VanillaFluidSimulator.h"
#include "../BlockInfo.h"
#include "../World.h"
#include "../Chunk.h"
#include "../BlockArea.h"
#include "../Blocks/BlockHandler.h"
#include "../BlockInServerPluginInterface.h"
static const int InfiniteCost = 100;
cVanillaFluidSimulator::cVanillaFluidSimulator(
cWorld & a_World,
BLOCKTYPE a_Fluid,
BLOCKTYPE a_StationaryFluid,
NIBBLETYPE a_Falloff,
int a_TickDelay,
int a_NumNeighborsForSource
) :
Super(a_World, a_Fluid, a_StationaryFluid, a_Falloff, a_TickDelay, a_NumNeighborsForSource)
{
}
void cVanillaFluidSimulator::SpreadXZ(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ, NIBBLETYPE a_NewMeta)
{
// Calculate the distance to the nearest "hole" in each direction:
int Cost[4];
Cost[0] = CalculateFlowCost(a_Chunk, a_RelX + 1, a_RelY, a_RelZ, X_PLUS);
Cost[1] = CalculateFlowCost(a_Chunk, a_RelX - 1, a_RelY, a_RelZ, X_MINUS);
Cost[2] = CalculateFlowCost(a_Chunk, a_RelX, a_RelY, a_RelZ + 1, Z_PLUS);
Cost[3] = CalculateFlowCost(a_Chunk, a_RelX, a_RelY, a_RelZ - 1, Z_MINUS);
// Find the minimum distance:
int MinCost = InfiniteCost;
for (unsigned int i = 0; i < ARRAYCOUNT(Cost); ++i)
{
if (Cost[i] < MinCost)
{
MinCost = Cost[i];
}
}
// Spread in all directions where the distance matches the minimum:
if (Cost[0] == MinCost)
{
SpreadToNeighbor(a_Chunk, a_RelX + 1, a_RelY, a_RelZ, a_NewMeta);
}
if (Cost[1] == MinCost)
{
SpreadToNeighbor(a_Chunk, a_RelX - 1, a_RelY, a_RelZ, a_NewMeta);
}
if (Cost[2] == MinCost)
{
SpreadToNeighbor(a_Chunk, a_RelX, a_RelY, a_RelZ + 1, a_NewMeta);
}
if (Cost[3] == MinCost)
{
SpreadToNeighbor(a_Chunk, a_RelX, a_RelY, a_RelZ - 1, a_NewMeta);
}
}
int cVanillaFluidSimulator::CalculateFlowCost(
cChunk * a_Chunk,
int a_RelX,
int a_RelY,
int a_RelZ,
Direction a_Dir,
unsigned a_Iteration
)
{
int Cost = InfiniteCost;
BLOCKTYPE BlockType;
NIBBLETYPE BlockMeta;
// Check if block is passable
if (!a_Chunk->UnboundedRelGetBlock(a_RelX, a_RelY, a_RelZ, BlockType, BlockMeta))
{
return Cost;
}
if (!IsPassableForFluid(BlockType) || // The block cannot be passed by the liquid ...
(IsAllowedBlock(BlockType) && (BlockMeta == 0)) // ... or if it is liquid, it is a source block
)
{
return Cost;
}
// Check if block below is passable
if ((a_RelY > 0) && !a_Chunk->UnboundedRelGetBlock(a_RelX, a_RelY - 1, a_RelZ, BlockType, BlockMeta))
{
return Cost;
}
if (IsPassableForFluid(BlockType) || IsBlockLiquid(BlockType))
{
// Path found, exit
return static_cast<int>(a_Iteration);
}
// 5 blocks away, bail out
if (a_Iteration > 3)
{
return Cost;
}
// Recurse
if (a_Dir != X_MINUS)
{
int NextCost = CalculateFlowCost(a_Chunk, a_RelX + 1, a_RelY, a_RelZ, X_PLUS, a_Iteration + 1);
if (NextCost < Cost)
{
Cost = NextCost;
}
}
if (a_Dir != X_PLUS)
{
int NextCost = CalculateFlowCost(a_Chunk, a_RelX - 1, a_RelY, a_RelZ, X_MINUS, a_Iteration + 1);
if (NextCost < Cost)
{
Cost = NextCost;
}
}
if (a_Dir != Z_MINUS)
{
int NextCost = CalculateFlowCost(a_Chunk, a_RelX, a_RelY, a_RelZ + 1, Z_PLUS, a_Iteration + 1);
if (NextCost < Cost)
{
Cost = NextCost;
}
}
if (a_Dir != Z_PLUS)
{
int NextCost = CalculateFlowCost(a_Chunk, a_RelX, a_RelY, a_RelZ - 1, Z_MINUS, a_Iteration + 1);
if (NextCost < Cost)
{
Cost = NextCost;
}
}
return Cost;
}
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