1 files changed, 309 insertions, 0 deletions

diff --git a/src/Simulator/SandSimulator.cpp b/src/Simulator/SandSimulator.cpp
new file mode 100644
index 000000000..87fb83357
--- /dev/null
+++ b/src/Simulator/SandSimulator.cpp
@@ -0,0 +1,309 @@
+
+#include "Globals.h"  // NOTE: MSVC stupidness requires this to be the same across all modules
+
+#include "SandSimulator.h"
+#include "../World.h"
+#include "../BlockID.h"
+#include "../Defines.h"
+#include "../Entities/FallingBlock.h"
+#include "../Chunk.h"
+
+
+
+
+
+cSandSimulator::cSandSimulator(cWorld & a_World, cIniFile & a_IniFile) :
+	cSimulator(a_World),
+	m_TotalBlocks(0)
+{
+	m_IsInstantFall = a_IniFile.GetValueSetB("Physics", "SandInstantFall", false);
+}
+
+
+
+
+
+void cSandSimulator::SimulateChunk(float a_Dt, int a_ChunkX, int a_ChunkZ, cChunk * a_Chunk)
+{
+	cSandSimulatorChunkData & ChunkData = a_Chunk->GetSandSimulatorData();
+	if (ChunkData.empty())
+	{
+		return;
+	}
+
+	int BaseX = a_Chunk->GetPosX() * cChunkDef::Width;
+	int BaseZ = a_Chunk->GetPosZ() * cChunkDef::Width;
+	for (cSandSimulatorChunkData::const_iterator itr = ChunkData.begin(), end = ChunkData.end(); itr != end; ++itr)
+	{
+		BLOCKTYPE BlockType = a_Chunk->GetBlock(itr->x, itr->y, itr->z);
+		if (!IsAllowedBlock(BlockType) || (itr->y <= 0))
+		{
+			continue;
+		}
+
+		BLOCKTYPE BlockBelow = (itr->y > 0) ? a_Chunk->GetBlock(itr->x, itr->y - 1, itr->z) : E_BLOCK_AIR;
+		if (CanStartFallingThrough(BlockBelow))
+		{
+			if (m_IsInstantFall)
+			{
+				DoInstantFall(a_Chunk, itr->x, itr->y, itr->z);
+				continue;
+			}
+			Vector3i Pos;
+			Pos.x = itr->x + BaseX;
+			Pos.y = itr->y;
+			Pos.z = itr->z + BaseZ;
+			/*
+			LOGD(
+				"Creating a falling block at {%d, %d, %d} of type %s, block below: %s",
+				Pos.x, Pos.y, Pos.z, ItemTypeToString(BlockType).c_str(), ItemTypeToString(BlockBelow).c_str()
+			);
+			*/
+			cFallingBlock * FallingBlock = new cFallingBlock(Pos, BlockType, a_Chunk->GetMeta(itr->x, itr->y, itr->z));
+			FallingBlock->Initialize(&m_World);
+			a_Chunk->SetBlock(itr->x, itr->y, itr->z, E_BLOCK_AIR, 0);
+		}
+	}
+	m_TotalBlocks -= ChunkData.size();
+	ChunkData.clear();
+}
+
+
+
+
+
+bool cSandSimulator::IsAllowedBlock(BLOCKTYPE a_BlockType)
+{
+	switch (a_BlockType)
+	{
+		case E_BLOCK_SAND:
+		case E_BLOCK_GRAVEL:
+		case E_BLOCK_ANVIL:
+		case E_BLOCK_DRAGON_EGG:
+		{
+			return true;
+		}
+	}
+	return false;
+}
+
+
+
+
+
+void cSandSimulator::AddBlock(int a_BlockX, int a_BlockY, int a_BlockZ, cChunk * a_Chunk)
+{
+	if ((a_Chunk == NULL) || !a_Chunk->IsValid())
+	{
+		return;
+	}
+	int RelX = a_BlockX - a_Chunk->GetPosX() * cChunkDef::Width;
+	int RelZ = a_BlockZ - a_Chunk->GetPosZ() * cChunkDef::Width;
+	if (!IsAllowedBlock(a_Chunk->GetBlock(RelX, a_BlockY, RelZ)))
+	{
+		return;
+	}
+
+	// Check for duplicates:
+	cSandSimulatorChunkData & ChunkData = a_Chunk->GetSandSimulatorData();
+	for (cSandSimulatorChunkData::iterator itr = ChunkData.begin(); itr != ChunkData.end(); ++itr)
+	{
+		if ((itr->x == RelX) && (itr->y == a_BlockY) && (itr->z == RelZ))
+		{
+			return;
+		}
+	}
+
+	m_TotalBlocks += 1;
+	ChunkData.push_back(cCoordWithInt(RelX, a_BlockY, RelZ));
+}
+
+
+
+
+
+bool cSandSimulator::CanStartFallingThrough(BLOCKTYPE a_BlockType)
+{
+	// Please keep the list alpha-sorted
+	switch (a_BlockType)
+	{
+		case E_BLOCK_AIR:
+		case E_BLOCK_FIRE:
+		case E_BLOCK_LAVA:
+		case E_BLOCK_SNOW:
+		case E_BLOCK_STATIONARY_LAVA:
+		case E_BLOCK_STATIONARY_WATER:
+		case E_BLOCK_WATER:
+		{
+			return true;
+		}
+	}
+	return false;
+}
+
+
+
+
+
+bool cSandSimulator::CanContinueFallThrough(BLOCKTYPE a_BlockType)
+{
+	// Please keep the list alpha-sorted
+	switch (a_BlockType)
+	{
+		case E_BLOCK_AIR:
+		case E_BLOCK_BROWN_MUSHROOM:
+		case E_BLOCK_COBWEB:
+		case E_BLOCK_CROPS:
+		case E_BLOCK_DEAD_BUSH:
+		case E_BLOCK_DETECTOR_RAIL:
+		case E_BLOCK_FIRE:
+		case E_BLOCK_FLOWER_POT:
+		case E_BLOCK_LAVA:
+		case E_BLOCK_LEVER:
+		case E_BLOCK_MINECART_TRACKS:
+		case E_BLOCK_MELON_STEM:
+		case E_BLOCK_POWERED_RAIL:
+		case E_BLOCK_PUMPKIN_STEM:
+		case E_BLOCK_REDSTONE_REPEATER_OFF:
+		case E_BLOCK_REDSTONE_REPEATER_ON:
+		case E_BLOCK_REDSTONE_TORCH_OFF:
+		case E_BLOCK_REDSTONE_TORCH_ON:
+		case E_BLOCK_REDSTONE_WIRE:
+		case E_BLOCK_RED_MUSHROOM:
+		case E_BLOCK_RED_ROSE:
+		case E_BLOCK_SIGN_POST:
+		case E_BLOCK_SNOW:
+		case E_BLOCK_STATIONARY_LAVA:
+		case E_BLOCK_STATIONARY_WATER:
+		case E_BLOCK_STONE_BUTTON:
+		case E_BLOCK_STONE_PRESSURE_PLATE:
+		case E_BLOCK_TALL_GRASS:
+		case E_BLOCK_TORCH:
+		case E_BLOCK_TRAPDOOR:
+		case E_BLOCK_TRIPWIRE:
+		case E_BLOCK_TRIPWIRE_HOOK:
+		case E_BLOCK_WALLSIGN:
+		case E_BLOCK_WATER:
+		case E_BLOCK_WOODEN_BUTTON:
+		case E_BLOCK_WOODEN_PRESSURE_PLATE:
+		case E_BLOCK_YELLOW_FLOWER:
+		{
+			return true;
+		}
+	}
+	return false;
+}
+
+
+
+
+
+bool cSandSimulator::IsReplacedOnRematerialization(BLOCKTYPE a_BlockType)
+{
+	// Please keep the list alpha-sorted
+	switch (a_BlockType)
+	{
+		case E_BLOCK_AIR:
+		case E_BLOCK_DEAD_BUSH:
+		case E_BLOCK_FIRE:
+		case E_BLOCK_LAVA:
+		case E_BLOCK_SNOW:
+		case E_BLOCK_STATIONARY_LAVA:
+		case E_BLOCK_STATIONARY_WATER:
+		case E_BLOCK_TALL_GRASS:
+		case E_BLOCK_WATER:
+		{
+			return true;
+		}
+	}
+	return false;
+}
+
+
+
+
+
+bool cSandSimulator::DoesBreakFallingThrough(BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta)
+{
+	switch (a_BlockType)
+	{
+		case E_BLOCK_STONE_SLAB:
+		case E_BLOCK_WOODEN_SLAB:
+		{
+			return ((a_BlockMeta & 0x08) == 0);  // Only a bottom-slab breaks the block
+		}
+	}
+	return false;
+}
+
+
+
+
+
+void cSandSimulator::FinishFalling(
+	cWorld * a_World, int a_BlockX, int a_BlockY, int a_BlockZ,
+	BLOCKTYPE a_FallingBlockType, NIBBLETYPE a_FallingBlockMeta
+)
+{
+	ASSERT(a_BlockY < cChunkDef::Height);
+	
+	BLOCKTYPE CurrentBlockType = a_World->GetBlock(a_BlockX, a_BlockY, a_BlockZ);
+	if ((a_FallingBlockType == E_BLOCK_ANVIL) || IsReplacedOnRematerialization(CurrentBlockType))
+	{
+		// Rematerialize the material here:
+		a_World->SetBlock(a_BlockX, a_BlockY, a_BlockZ, a_FallingBlockType, a_FallingBlockMeta);
+		return;
+	}
+	
+	// Create a pickup instead:
+	cItems Pickups;
+	Pickups.Add((ENUM_ITEM_ID)a_FallingBlockType, 1, a_FallingBlockMeta);
+	a_World->SpawnItemPickups(Pickups, (double)a_BlockX + 0.5, (double)a_BlockY + 0.5, (double)a_BlockZ + 0.5);
+}
+
+
+
+
+
+void cSandSimulator::DoInstantFall(cChunk * a_Chunk, int a_RelX, int a_RelY, int a_RelZ)
+{
+	// Remove the original block:
+	BLOCKTYPE  FallingBlockType;
+	NIBBLETYPE FallingBlockMeta;
+	a_Chunk->GetBlockTypeMeta(a_RelX, a_RelY, a_RelZ, FallingBlockType, FallingBlockMeta);
+	a_Chunk->SetBlock(a_RelX, a_RelY, a_RelZ, E_BLOCK_AIR, 0);
+	
+	// Search for a place to put it:
+	for (int y = a_RelY - 1; y >= 0; y--)
+	{
+		BLOCKTYPE BlockType;
+		NIBBLETYPE BlockMeta;
+		a_Chunk->GetBlockTypeMeta(a_RelX, y, a_RelZ, BlockType, BlockMeta);
+		int BlockY;
+		if (DoesBreakFallingThrough(BlockType, BlockMeta))
+		{
+			BlockY = y;
+		}
+		else if (!CanContinueFallThrough(BlockType))
+		{
+			BlockY = y + 1;
+		}
+		else
+		{
+			// Can fall further down
+			continue;
+		}
+		
+		// Finish the fall at the found bottom:
+		int BlockX = a_RelX + a_Chunk->GetPosX() * cChunkDef::Width;
+		int BlockZ = a_RelZ + a_Chunk->GetPosZ() * cChunkDef::Width;
+		FinishFalling(&m_World, BlockX, BlockY, BlockZ, FallingBlockType, FallingBlockMeta);
+		return;
+	}
+	
+	// The block just "fell off the world" without leaving a trace
+}
+
+
+
+