1 files changed, 592 insertions, 0 deletions

diff --git a/src/ChunkData.cpp b/src/ChunkData.cpp
new file mode 100644
index 000000000..f2d220bd2
--- /dev/null
+++ b/src/ChunkData.cpp
@@ -0,0 +1,592 @@
+
+// ChunkData.cpp
+
+// Implements the cChunkData class that represents the block's type, meta, blocklight and skylight storage for a chunk
+
+#include "Globals.h"
+#include "ChunkData.h"
+
+
+
+
+
+/** Returns true if all a_Array's elements between [0] and [a_NumElements - 1] are equal to a_Value. */
+template <typename T> inline bool IsAllValue(const T * a_Array, size_t a_NumElements, T a_Value)
+{
+	for (size_t i = 0; i < a_NumElements; i++)
+	{
+		if (a_Array[i] != a_Value)
+		{
+			return false;
+		}
+	}
+	return true;
+}
+
+
+
+
+
+cChunkData::cChunkData(void)
+#if __cplusplus < 201103L
+	// auto_ptr style interface for memory management
+	: m_IsOwner(true)
+#endif
+{
+	for (size_t i = 0; i < NumSections; i++)
+	{
+		m_Sections[i] = NULL;
+	}
+}
+
+
+
+
+
+cChunkData::~cChunkData()
+{
+	#if __cplusplus < 201103L
+		// auto_ptr style interface for memory management
+		if (!m_IsOwner)
+		{
+			return;
+		}
+	#endif
+	for (size_t i = 0; i < NumSections; i++)
+	{
+		Free(m_Sections[i]);
+		m_Sections[i] = NULL;
+	}
+}
+
+
+
+
+
+#if __cplusplus < 201103L
+	// auto_ptr style interface for memory management
+	cChunkData::cChunkData(const cChunkData & a_Other) :
+		m_IsOwner(true)
+	{
+		// Move contents and ownership from a_Other to this, pointer-wise:
+		for (size_t i = 0; i < NumSections; i++)
+		{
+			m_Sections[i] = a_Other.m_Sections[i];
+		}
+		a_Other.m_IsOwner = false;
+	}
+
+
+
+
+
+	cChunkData & cChunkData::operator =(const cChunkData & a_Other)
+	{
+		// If assigning to self, no-op
+		if (&a_Other == this)
+		{
+			return *this;
+		}
+		
+		// Free any currently held contents:
+		if (m_IsOwner)
+		{
+			for (size_t i = 0; i < NumSections; i++)
+			{
+				Free(m_Sections[i]);
+				m_Sections[i] = NULL;
+			}
+		}
+		
+		// Move contents and ownership from a_Other to this, pointer-wise:
+		m_IsOwner = true;
+		for (size_t i = 0; i < NumSections; i++)
+		{
+			m_Sections[i] = a_Other.m_Sections[i];
+		}
+		a_Other.m_IsOwner = false;
+		return *this;
+	}
+	
+#else
+
+	// unique_ptr style interface for memory management
+	cChunkData::cChunkData(cChunkData && other)
+	{
+		for (size_t i = 0; i < NumSections; i++)
+		{
+			m_Sections[i] = other.m_Sections[i];
+			other.m_Sections[i] = NULL;
+		}
+	}
+	
+	
+	
+	
+
+	cChunkData & cChunkData::operator =(cChunkData && other)
+	{
+		if (&other != this)
+		{
+			for (size_t i = 0; i < NumSections; i++)
+			{
+				Free(m_Sections[i]);
+				m_Sections[i] = other.m_Sections[i];
+				other.m_Sections[i] = NULL;
+			}
+		}
+		return *this;
+	}
+#endif
+
+
+
+
+
+BLOCKTYPE cChunkData::GetBlock(int a_X, int a_Y, int a_Z) const
+{
+	ASSERT((a_X >= 0) && (a_X < cChunkDef::Width));
+	ASSERT((a_Y >= 0) && (a_Y < cChunkDef::Height));
+	ASSERT((a_Z >= 0) && (a_Z < cChunkDef::Width));
+	int Section = a_Y / SectionHeight;
+	if (m_Sections[Section] != NULL)
+	{
+		int Index = cChunkDef::MakeIndexNoCheck(a_X, a_Y - (Section * SectionHeight), a_Z);
+		return m_Sections[Section]->m_BlockTypes[Index];
+	}
+	else
+	{
+		return 0;
+	}
+}
+
+
+
+
+
+void cChunkData::SetBlock(int a_RelX, int a_RelY, int a_RelZ, BLOCKTYPE a_Block)
+{
+	if (
+		(a_RelX >= cChunkDef::Width)  || (a_RelX < 0) ||
+		(a_RelY >= cChunkDef::Height) || (a_RelY < 0) ||
+		(a_RelZ >= cChunkDef::Width)  || (a_RelZ < 0)
+	)
+	{
+		ASSERT(!"cChunkData::SetMeta(): index out of range!");
+		return;
+	}
+
+	int Section = a_RelY / SectionHeight;
+	if (m_Sections[Section] == NULL)
+	{
+		if (a_Block == 0x00)
+		{
+			return;
+		}
+		m_Sections[Section] = Allocate();
+		if (m_Sections[Section] == NULL)
+		{
+			ASSERT(!"Failed to allocate a new section in Chunkbuffer");
+			return;
+		}
+		ZeroSection(m_Sections[Section]);
+	}
+	int Index = cChunkDef::MakeIndexNoCheck(a_RelX, a_RelY - (Section * SectionHeight), a_RelZ);
+	m_Sections[Section]->m_BlockTypes[Index] = a_Block;
+}
+
+
+
+
+
+NIBBLETYPE cChunkData::GetMeta(int a_RelX, int a_RelY, int a_RelZ) const
+{
+	if (
+		(a_RelX < cChunkDef::Width) && (a_RelX > -1) &&
+		(a_RelY < cChunkDef::Height) && (a_RelY > -1) &&
+		(a_RelZ < cChunkDef::Width) && (a_RelZ > -1))
+	{
+		int Section = a_RelY / SectionHeight;
+		if (m_Sections[Section] != NULL)
+		{
+			int Index = cChunkDef::MakeIndexNoCheck(a_RelX, a_RelY - (Section * SectionHeight), a_RelZ);
+			return (m_Sections[Section]->m_BlockMetas[Index / 2] >> ((Index & 1) * 4)) & 0x0f;
+		}
+		else
+		{
+			return 0;
+		}
+	}
+	ASSERT(!"cChunkData::GetMeta(): coords out of chunk range!");
+	return 0;
+}
+
+
+
+
+
+bool cChunkData::SetMeta(int a_RelX, int a_RelY, int a_RelZ, NIBBLETYPE a_Nibble)
+{
+	if (
+		(a_RelX >= cChunkDef::Width)  || (a_RelX < 0) ||
+		(a_RelY >= cChunkDef::Height) || (a_RelY < 0) ||
+		(a_RelZ >= cChunkDef::Width)  || (a_RelZ < 0)
+	)
+	{
+		ASSERT(!"cChunkData::SetMeta(): index out of range!");
+		return false;
+	}
+
+	int Section = a_RelY / SectionHeight;
+	if (m_Sections[Section] == NULL)
+	{
+		if ((a_Nibble & 0xf) == 0x00)
+		{
+			return false;
+		}
+		m_Sections[Section] = Allocate();
+		if (m_Sections[Section] == NULL)
+		{
+			ASSERT(!"Failed to allocate a new section in Chunkbuffer");
+			return false;
+		}
+		ZeroSection(m_Sections[Section]);
+	}
+	int Index = cChunkDef::MakeIndexNoCheck(a_RelX, a_RelY - (Section * SectionHeight), a_RelZ);
+	NIBBLETYPE oldval = m_Sections[Section]->m_BlockMetas[Index / 2] >> ((Index & 1) * 4) & 0xf;
+	m_Sections[Section]->m_BlockMetas[Index / 2] = static_cast<NIBBLETYPE>(
+		(m_Sections[Section]->m_BlockMetas[Index / 2] & (0xf0 >> ((Index & 1) * 4))) |  // The untouched nibble
+		((a_Nibble & 0x0f) << ((Index & 1) * 4))  // The nibble being set
+	);
+	return oldval != a_Nibble;
+}
+
+
+
+
+
+NIBBLETYPE cChunkData::GetBlockLight(int a_RelX, int a_RelY, int a_RelZ) const
+{
+	if (
+		(a_RelX < cChunkDef::Width) && (a_RelX > -1) &&
+		(a_RelY < cChunkDef::Height) && (a_RelY > -1) &&
+		(a_RelZ < cChunkDef::Width) && (a_RelZ > -1)
+	)
+	{
+		int Section = a_RelY / SectionHeight;
+		if (m_Sections[Section] != NULL)
+		{
+			int Index = cChunkDef::MakeIndexNoCheck(a_RelX, a_RelY - (Section * SectionHeight), a_RelZ);
+			return (m_Sections[Section]->m_BlockLight[Index / 2] >> ((Index & 1) * 4)) & 0x0f;
+		}
+		else
+		{
+			return 0;
+		}
+	}
+	ASSERT(!"cChunkData::GetMeta(): coords out of chunk range!");
+	return 0;
+}
+
+
+
+
+
+NIBBLETYPE cChunkData::GetSkyLight(int a_RelX, int a_RelY, int a_RelZ) const
+{
+	if ((a_RelX < cChunkDef::Width) && (a_RelX > -1) && (a_RelY < cChunkDef::Height) && (a_RelY > -1) && (a_RelZ < cChunkDef::Width) && (a_RelZ > -1))
+	{
+		int Section = a_RelY / SectionHeight;
+		if (m_Sections[Section] != NULL)
+		{
+			int Index = cChunkDef::MakeIndexNoCheck(a_RelX, a_RelY - (Section * SectionHeight), a_RelZ);
+			return (m_Sections[Section]->m_BlockSkyLight[Index / 2] >> ((Index & 1) * 4)) & 0x0f;
+		}
+		else
+		{
+			return 0xF;
+		}
+	}
+	ASSERT(!"cChunkData::GetMeta(): coords out of chunk range!");
+	return 0;
+}
+
+
+
+
+
+cChunkData cChunkData::Copy(void) const
+{
+	cChunkData copy;
+	for (size_t i = 0; i < NumSections; i++)
+	{
+		if (m_Sections[i] != NULL)
+		{
+			copy.m_Sections[i] = Allocate();
+			*copy.m_Sections[i] = *m_Sections[i];
+		}
+	}
+	return copy;
+}
+
+
+
+
+
+void cChunkData::CopyBlockTypes(BLOCKTYPE * a_Dest, size_t a_Idx, size_t a_Length) const
+{
+	size_t ToSkip = a_Idx;
+	
+	for (size_t i = 0; i < NumSections; i++)
+	{
+		size_t StartPos = 0;
+		if (ToSkip > 0)
+		{
+			StartPos = std::min(ToSkip, +SectionBlockCount);
+			ToSkip -= StartPos;
+		}
+		if (StartPos < SectionBlockCount)
+		{
+			size_t ToCopy = std::min(+SectionBlockCount - StartPos, a_Length);
+			a_Length -= ToCopy;
+			if (m_Sections[i] != NULL)
+			{
+				BLOCKTYPE * blockbuffer = m_Sections[i]->m_BlockTypes;
+				memcpy(&a_Dest[(i * SectionBlockCount) + StartPos - a_Idx], blockbuffer + StartPos, sizeof(BLOCKTYPE) * ToCopy);
+			}
+			else
+			{
+				memset(&a_Dest[(i * SectionBlockCount) - a_Idx], 0, sizeof(BLOCKTYPE) * ToCopy);
+			}
+		}
+	}
+}
+
+
+
+
+
+void cChunkData::CopyMetas(NIBBLETYPE * a_Dest) const
+{
+	for (size_t i = 0; i < NumSections; i++)
+	{
+		if (m_Sections[i] != NULL)
+		{
+			memcpy(&a_Dest[i * SectionBlockCount / 2], &m_Sections[i]->m_BlockMetas, sizeof(m_Sections[i]->m_BlockMetas));
+		}
+		else
+		{
+			memset(&a_Dest[i * SectionBlockCount / 2], 0, sizeof(m_Sections[i]->m_BlockMetas));
+		}
+	}
+}
+
+
+
+
+
+void cChunkData::CopyBlockLight(NIBBLETYPE * a_Dest) const
+{
+	for (size_t i = 0; i < NumSections; i++)
+	{
+		if (m_Sections[i] != NULL)
+		{
+			memcpy(&a_Dest[i * SectionBlockCount / 2], &m_Sections[i]->m_BlockLight, sizeof(m_Sections[i]->m_BlockLight));
+		}
+		else
+		{
+			memset(&a_Dest[i * SectionBlockCount / 2], 0, sizeof(m_Sections[i]->m_BlockLight));
+		}
+	}
+}
+
+
+
+
+
+void cChunkData::CopySkyLight(NIBBLETYPE * a_Dest) const
+{
+	for (size_t i = 0; i < NumSections; i++)
+	{
+		if (m_Sections[i] != NULL)
+		{
+			memcpy(&a_Dest[i * SectionBlockCount / 2], &m_Sections[i]->m_BlockSkyLight, sizeof(m_Sections[i]->m_BlockSkyLight));
+		}
+		else
+		{
+			memset(&a_Dest[i * SectionBlockCount / 2], 0xff, sizeof(m_Sections[i]->m_BlockSkyLight));
+		}
+	}
+}
+
+
+
+
+
+void cChunkData::SetBlockTypes(const BLOCKTYPE * a_Src)
+{
+	ASSERT(a_Src != NULL);
+	
+	for (size_t i = 0; i < NumSections; i++)
+	{
+		// If the section is already allocated, copy the data into it:
+		if (m_Sections[i] != NULL)
+		{
+			memcpy(m_Sections[i]->m_BlockTypes, &a_Src[i * SectionBlockCount], sizeof(m_Sections[i]->m_BlockTypes));
+			continue;
+		}
+
+		// The section doesn't exist, find out if it is needed:
+		if (IsAllValue(a_Src + i * SectionBlockCount, SectionBlockCount, (const BLOCKTYPE)0))
+		{
+			// No need for the section, the data is all-air
+			continue;
+		}
+		
+		// Allocate the section and copy the data into it:
+		m_Sections[i] = Allocate();
+		memcpy(m_Sections[i]->m_BlockTypes, &a_Src[i * SectionBlockCount], sizeof(m_Sections[i]->m_BlockTypes));
+		memset(m_Sections[i]->m_BlockMetas,    0x00, sizeof(m_Sections[i]->m_BlockMetas));
+		memset(m_Sections[i]->m_BlockLight,    0x00, sizeof(m_Sections[i]->m_BlockLight));
+		memset(m_Sections[i]->m_BlockSkyLight, 0xff, sizeof(m_Sections[i]->m_BlockSkyLight));
+	}  // for i - m_Sections[]
+}
+
+
+
+
+void cChunkData::SetMetas(const NIBBLETYPE * a_Src)
+{
+	ASSERT(a_Src != NULL);
+	
+	for (size_t i = 0; i < NumSections; i++)
+	{
+		// If the section is already allocated, copy the data into it:
+		if (m_Sections[i] != NULL)
+		{
+			memcpy(m_Sections[i]->m_BlockMetas, &a_Src[i * SectionBlockCount / 2], sizeof(m_Sections[i]->m_BlockMetas));
+			continue;
+		}
+		
+		// The section doesn't exist, find out if it is needed:
+		if (IsAllValue(a_Src + i * SectionBlockCount / 2, SectionBlockCount / 2, (NIBBLETYPE)0))
+		{
+			// No need for the section, the data is all zeroes
+			continue;
+		}
+		
+		// Allocate the section and copy the data into it:
+		m_Sections[i] = Allocate();
+		memcpy(m_Sections[i]->m_BlockMetas, &a_Src[i * SectionBlockCount / 2], sizeof(m_Sections[i]->m_BlockMetas));
+		memset(m_Sections[i]->m_BlockTypes,    0x00, sizeof(m_Sections[i]->m_BlockTypes));
+		memset(m_Sections[i]->m_BlockLight,    0x00, sizeof(m_Sections[i]->m_BlockLight));
+		memset(m_Sections[i]->m_BlockSkyLight, 0xff, sizeof(m_Sections[i]->m_BlockSkyLight));
+	}  // for i - m_Sections[]
+}
+
+
+
+
+
+void cChunkData::SetBlockLight(const NIBBLETYPE * a_Src)
+{
+	if (a_Src == NULL)
+	{
+		return;
+	}
+	
+	for (size_t i = 0; i < NumSections; i++)
+	{
+		// If the section is already allocated, copy the data into it:
+		if (m_Sections[i] != NULL)
+		{
+			memcpy(m_Sections[i]->m_BlockLight, &a_Src[i * SectionBlockCount / 2], sizeof(m_Sections[i]->m_BlockLight));
+			continue;
+		}
+		
+		// The section doesn't exist, find out if it is needed:
+		if (IsAllValue(a_Src + i * SectionBlockCount / 2, SectionBlockCount / 2, (NIBBLETYPE)0))
+		{
+			// No need for the section, the data is all zeroes
+			continue;
+		}
+		
+		// Allocate the section and copy the data into it:
+		m_Sections[i] = Allocate();
+		memcpy(m_Sections[i]->m_BlockLight, &a_Src[i * SectionBlockCount / 2], sizeof(m_Sections[i]->m_BlockLight));
+		memset(m_Sections[i]->m_BlockTypes,    0x00, sizeof(m_Sections[i]->m_BlockTypes));
+		memset(m_Sections[i]->m_BlockMetas,    0x00, sizeof(m_Sections[i]->m_BlockMetas));
+		memset(m_Sections[i]->m_BlockSkyLight, 0xff, sizeof(m_Sections[i]->m_BlockSkyLight));
+	}  // for i - m_Sections[]
+}
+
+
+
+
+void cChunkData::SetSkyLight(const NIBBLETYPE * a_Src)
+{
+	if (a_Src == NULL)
+	{
+		return;
+	}
+	
+	for (size_t i = 0; i < NumSections; i++)
+	{
+		// If the section is already allocated, copy the data into it:
+		if (m_Sections[i] != NULL)
+		{
+			memcpy(m_Sections[i]->m_BlockSkyLight, &a_Src[i * SectionBlockCount / 2], sizeof(m_Sections[i]->m_BlockSkyLight));
+			continue;
+		}
+
+		// The section doesn't exist, find out if it is needed:
+		if (IsAllValue(a_Src + i * SectionBlockCount / 2, SectionBlockCount / 2, (NIBBLETYPE)0xff))
+		{
+			// No need for the section, the data is all zeroes
+			continue;
+		}
+		
+		// Allocate the section and copy the data into it:
+		m_Sections[i] = Allocate();
+		memcpy(m_Sections[i]->m_BlockSkyLight, &a_Src[i * SectionBlockCount / 2], sizeof(m_Sections[i]->m_BlockSkyLight));
+		memset(m_Sections[i]->m_BlockTypes, 0x00, sizeof(m_Sections[i]->m_BlockTypes));
+		memset(m_Sections[i]->m_BlockMetas, 0x00, sizeof(m_Sections[i]->m_BlockMetas));
+		memset(m_Sections[i]->m_BlockLight, 0x00, sizeof(m_Sections[i]->m_BlockLight));
+	}  // for i - m_Sections[]
+}
+
+
+
+
+
+cChunkData::sChunkSection * cChunkData::Allocate(void)
+{
+	// TODO: Use an allocation pool
+	return new cChunkData::sChunkSection;
+}
+
+
+
+
+
+void cChunkData::Free(cChunkData::sChunkSection * a_Section)
+{
+	// TODO: Use an allocation pool
+	delete a_Section;
+}
+
+
+
+
+
+void cChunkData::ZeroSection(cChunkData::sChunkSection * a_Section) const
+{
+	memset(a_Section->m_BlockTypes,    0x00, sizeof(a_Section->m_BlockTypes));
+	memset(a_Section->m_BlockMetas,    0x00, sizeof(a_Section->m_BlockMetas));
+	memset(a_Section->m_BlockLight,    0x00, sizeof(a_Section->m_BlockLight));
+	memset(a_Section->m_BlockSkyLight, 0xff, sizeof(a_Section->m_BlockSkyLight));
+}
+
+
+
+