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cuberite-2a/src/ChunkData.cpp

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// ChunkData.cpp
// Implements the cChunkData class that represents the block's type, meta, blocklight and skylight storage for a chunk
#include "Globals.h"
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#include "ChunkData.h"
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/** 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(cAllocationPool<cChunkData::sChunkSection> & a_Pool) :
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#if __cplusplus < 201103L
// auto_ptr style interface for memory management
m_IsOwner(true),
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#endif
m_Pool(a_Pool)
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{
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for (size_t i = 0; i < NumSections; i++)
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{
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m_Sections[i] = nullptr;
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}
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}
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cChunkData::~cChunkData()
{
#if __cplusplus < 201103L
// auto_ptr style interface for memory management
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if (!m_IsOwner)
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{
return;
}
#endif
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for (size_t i = 0; i < NumSections; i++)
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{
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Free(m_Sections[i]);
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m_Sections[i] = nullptr;
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}
}
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#if __cplusplus < 201103L
// auto_ptr style interface for memory management
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cChunkData::cChunkData(const cChunkData & a_Other) :
m_IsOwner(true),
m_Pool(a_Other.m_Pool)
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{
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// Move contents and ownership from a_Other to this, pointer-wise:
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for (size_t i = 0; i < NumSections; i++)
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{
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m_Sections[i] = a_Other.m_Sections[i];
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}
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a_Other.m_IsOwner = false;
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}
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cChunkData & cChunkData::operator =(const cChunkData & a_Other)
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{
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// If assigning to self, no-op
if (&a_Other == this)
{
return *this;
}
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// Free any currently held contents:
if (m_IsOwner)
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{
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for (size_t i = 0; i < NumSections; i++)
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{
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Free(m_Sections[i]);
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m_Sections[i] = nullptr;
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}
}
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// Move contents and ownership from a_Other to this, pointer-wise:
m_IsOwner = true;
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for (size_t i = 0; i < NumSections; i++)
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{
m_Sections[i] = a_Other.m_Sections[i];
}
a_Other.m_IsOwner = false;
ASSERT(&m_Pool == &a_Other.m_Pool);
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return *this;
}
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#else
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// unique_ptr style interface for memory management
cChunkData::cChunkData(cChunkData && other) :
m_Pool(other.m_Pool)
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{
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for (size_t i = 0; i < NumSections; i++)
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{
m_Sections[i] = other.m_Sections[i];
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other.m_Sections[i] = nullptr;
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}
}
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cChunkData & cChunkData::operator =(cChunkData && other)
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{
if (&other != this)
{
ASSERT(&m_Pool == &other.m_Pool);
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for (size_t i = 0; i < NumSections; i++)
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{
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Free(m_Sections[i]);
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m_Sections[i] = other.m_Sections[i];
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other.m_Sections[i] = nullptr;
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}
}
return *this;
}
#endif
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BLOCKTYPE cChunkData::GetBlock(int a_X, int a_Y, int a_Z) const
{
if (
(a_X < 0) || (a_X >= cChunkDef::Width) ||
(a_Y < 0) || (a_Y >= cChunkDef::Height) ||
(a_Z < 0) || (a_Z >= cChunkDef::Width)
)
{
return E_BLOCK_AIR; // Coordinates are outside outside the world, so this must be an air block
}
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int Section = a_Y / SectionHeight;
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if (m_Sections[Section] != nullptr)
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{
int Index = cChunkDef::MakeIndexNoCheck(a_X, static_cast<int>(static_cast<UInt32>(a_Y) - (static_cast<UInt32>(Section) * SectionHeight)), a_Z);
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return m_Sections[Section]->m_BlockTypes[Index];
}
else
{
return 0;
}
}
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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 = static_cast<int>(static_cast<UInt32>(a_RelY) / SectionHeight);
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if (m_Sections[Section] == nullptr)
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{
if (a_Block == 0x00)
{
return;
}
m_Sections[Section] = Allocate();
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if (m_Sections[Section] == nullptr)
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{
ASSERT(!"Failed to allocate a new section in Chunkbuffer");
return;
}
ZeroSection(m_Sections[Section]);
}
int Index = cChunkDef::MakeIndexNoCheck(a_RelX, static_cast<int>(static_cast<UInt32>(a_RelY) - (static_cast<UInt32>(Section) * SectionHeight)), a_RelZ);
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m_Sections[Section]->m_BlockTypes[Index] = a_Block;
}
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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 = static_cast<int>(static_cast<UInt32>(a_RelY) / SectionHeight);
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if (m_Sections[Section] != nullptr)
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{
int Index = cChunkDef::MakeIndexNoCheck(a_RelX, static_cast<int>(static_cast<UInt32>(a_RelY) - (static_cast<UInt32>(Section) * SectionHeight)), a_RelZ);
return (m_Sections[Section]->m_BlockMetas[Index / 2] >> ((Index & 1) * 4)) & 0x0f;
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}
else
{
return 0;
}
}
// Coordinates are outside outside the world, so it must be an air block with a blank meta
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return 0;
}
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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 = static_cast<int>(static_cast<UInt32>(a_RelY) / SectionHeight);
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if (m_Sections[Section] == nullptr)
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{
if ((a_Nibble & 0xf) == 0x00)
{
return false;
}
m_Sections[Section] = Allocate();
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if (m_Sections[Section] == nullptr)
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{
ASSERT(!"Failed to allocate a new section in Chunkbuffer");
return false;
}
ZeroSection(m_Sections[Section]);
}
int Index = cChunkDef::MakeIndexNoCheck(a_RelX, static_cast<int>(static_cast<UInt32>(a_RelY) - (static_cast<UInt32>(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
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((a_Nibble & 0x0f) << ((Index & 1) * 4)) // The nibble being set
);
return oldval != a_Nibble;
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}
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NIBBLETYPE cChunkData::GetBlockLight(int a_RelX, int a_RelY, int a_RelZ) const
{
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if (
(a_RelX < cChunkDef::Width) && (a_RelX > -1) &&
(a_RelY < cChunkDef::Height) && (a_RelY > -1) &&
(a_RelZ < cChunkDef::Width) && (a_RelZ > -1)
)
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{
int Section = static_cast<int>(static_cast<UInt32>(a_RelY) / SectionHeight);
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if (m_Sections[Section] != nullptr)
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{
int Index = cChunkDef::MakeIndexNoCheck(a_RelX, static_cast<int>(static_cast<UInt32>(a_RelY) - (static_cast<UInt32>(Section) * SectionHeight)), a_RelZ);
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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;
}
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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 = static_cast<int>(static_cast<UInt32>(a_RelY) / SectionHeight);
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if (m_Sections[Section] != nullptr)
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{
int Index = cChunkDef::MakeIndexNoCheck(a_RelX, static_cast<int>(static_cast<UInt32>(a_RelY) - (static_cast<UInt32>(Section) * SectionHeight)), a_RelZ);
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return (m_Sections[Section]->m_BlockSkyLight[Index / 2] >> ((Index & 1) * 4)) & 0x0f;
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}
else
{
return 0xF;
}
}
ASSERT(!"cChunkData::GetMeta(): coords out of chunk range!");
return 0;
}
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cChunkData cChunkData::Copy(void) const
{
cChunkData copy(m_Pool);
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for (size_t i = 0; i < NumSections; i++)
{
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if (m_Sections[i] != nullptr)
{
copy.m_Sections[i] = copy.Allocate();
*copy.m_Sections[i] = *m_Sections[i];
}
}
return copy;
}
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void cChunkData::CopyBlockTypes(BLOCKTYPE * a_Dest, size_t a_Idx, size_t a_Length) const
{
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size_t ToSkip = a_Idx;
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for (size_t i = 0; i < NumSections; i++)
{
size_t StartPos = 0;
if (ToSkip > 0)
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{
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StartPos = std::min(ToSkip, +SectionBlockCount);
ToSkip -= StartPos;
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}
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if (StartPos < SectionBlockCount)
{
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size_t ToCopy = std::min(+SectionBlockCount - StartPos, a_Length);
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a_Length -= ToCopy;
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if (m_Sections[i] != nullptr)
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{
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BLOCKTYPE * blockbuffer = m_Sections[i]->m_BlockTypes;
memcpy(&a_Dest[(i * SectionBlockCount) + StartPos - a_Idx], blockbuffer + StartPos, sizeof(BLOCKTYPE) * ToCopy);
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}
else
{
memset(&a_Dest[(i * SectionBlockCount) + StartPos - a_Idx], 0, sizeof(BLOCKTYPE) * ToCopy);
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}
}
}
}
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void cChunkData::CopyMetas(NIBBLETYPE * a_Dest) const
{
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for (size_t i = 0; i < NumSections; i++)
{
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if (m_Sections[i] != nullptr)
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{
memcpy(&a_Dest[i * SectionBlockCount / 2], &m_Sections[i]->m_BlockMetas, sizeof(m_Sections[i]->m_BlockMetas));
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}
else
{
memset(&a_Dest[i * SectionBlockCount / 2], 0, sizeof(m_Sections[i]->m_BlockMetas));
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}
}
}
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void cChunkData::CopyBlockLight(NIBBLETYPE * a_Dest) const
{
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for (size_t i = 0; i < NumSections; i++)
{
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if (m_Sections[i] != nullptr)
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{
memcpy(&a_Dest[i * SectionBlockCount / 2], &m_Sections[i]->m_BlockLight, sizeof(m_Sections[i]->m_BlockLight));
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}
else
{
memset(&a_Dest[i * SectionBlockCount / 2], 0, sizeof(m_Sections[i]->m_BlockLight));
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}
}
}
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void cChunkData::CopySkyLight(NIBBLETYPE * a_Dest) const
{
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for (size_t i = 0; i < NumSections; i++)
{
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if (m_Sections[i] != nullptr)
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{
memcpy(&a_Dest[i * SectionBlockCount / 2], &m_Sections[i]->m_BlockSkyLight, sizeof(m_Sections[i]->m_BlockSkyLight));
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}
else
{
memset(&a_Dest[i * SectionBlockCount / 2], 0xff, sizeof(m_Sections[i]->m_BlockSkyLight));
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}
}
}
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void cChunkData::SetBlockTypes(const BLOCKTYPE * a_Src)
{
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ASSERT(a_Src != nullptr);
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for (size_t i = 0; i < NumSections; i++)
{
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// If the section is already allocated, copy the data into it:
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if (m_Sections[i] != nullptr)
{
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memcpy(m_Sections[i]->m_BlockTypes, &a_Src[i * SectionBlockCount], sizeof(m_Sections[i]->m_BlockTypes));
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continue;
}
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// The section doesn't exist, find out if it is needed:
if (IsAllValue(a_Src + i * SectionBlockCount, SectionBlockCount, static_cast<BLOCKTYPE>(0)))
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{
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// No need for the section, the data is all-air
continue;
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}
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// Allocate the section and copy the data into it:
m_Sections[i] = Allocate();
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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));
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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[]
}
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void cChunkData::SetMetas(const NIBBLETYPE * a_Src)
{
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ASSERT(a_Src != nullptr);
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for (size_t i = 0; i < NumSections; i++)
{
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// If the section is already allocated, copy the data into it:
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if (m_Sections[i] != nullptr)
{
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memcpy(m_Sections[i]->m_BlockMetas, &a_Src[i * SectionBlockCount / 2], sizeof(m_Sections[i]->m_BlockMetas));
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continue;
}
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// The section doesn't exist, find out if it is needed:
if (IsAllValue(a_Src + i * SectionBlockCount / 2, SectionBlockCount / 2, static_cast<NIBBLETYPE>(0)))
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{
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// No need for the section, the data is all zeroes
continue;
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}
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// Allocate the section and copy the data into it:
m_Sections[i] = Allocate();
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memcpy(m_Sections[i]->m_BlockMetas, &a_Src[i * SectionBlockCount / 2], sizeof(m_Sections[i]->m_BlockMetas));
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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[]
}
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void cChunkData::SetBlockLight(const NIBBLETYPE * a_Src)
{
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if (a_Src == nullptr)
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{
return;
}
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for (size_t i = 0; i < NumSections; i++)
{
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// If the section is already allocated, copy the data into it:
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if (m_Sections[i] != nullptr)
{
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memcpy(m_Sections[i]->m_BlockLight, &a_Src[i * SectionBlockCount / 2], sizeof(m_Sections[i]->m_BlockLight));
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continue;
}
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// The section doesn't exist, find out if it is needed:
if (IsAllValue(a_Src + i * SectionBlockCount / 2, SectionBlockCount / 2, static_cast<NIBBLETYPE>(0)))
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{
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// No need for the section, the data is all zeroes
continue;
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}
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// Allocate the section and copy the data into it:
m_Sections[i] = Allocate();
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memcpy(m_Sections[i]->m_BlockLight, &a_Src[i * SectionBlockCount / 2], sizeof(m_Sections[i]->m_BlockLight));
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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));
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memset(m_Sections[i]->m_BlockSkyLight, 0xff, sizeof(m_Sections[i]->m_BlockSkyLight));
} // for i - m_Sections[]
}
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void cChunkData::SetSkyLight(const NIBBLETYPE * a_Src)
{
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if (a_Src == nullptr)
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{
return;
}
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for (size_t i = 0; i < NumSections; i++)
{
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// If the section is already allocated, copy the data into it:
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if (m_Sections[i] != nullptr)
{
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memcpy(m_Sections[i]->m_BlockSkyLight, &a_Src[i * SectionBlockCount / 2], sizeof(m_Sections[i]->m_BlockSkyLight));
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continue;
}
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// The section doesn't exist, find out if it is needed:
if (IsAllValue(a_Src + i * SectionBlockCount / 2, SectionBlockCount / 2, static_cast<NIBBLETYPE>(0xff)))
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{
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// No need for the section, the data is all zeroes
continue;
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}
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// Allocate the section and copy the data into it:
m_Sections[i] = Allocate();
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memcpy(m_Sections[i]->m_BlockSkyLight, &a_Src[i * SectionBlockCount / 2], sizeof(m_Sections[i]->m_BlockSkyLight));
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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));
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memset(m_Sections[i]->m_BlockLight, 0x00, sizeof(m_Sections[i]->m_BlockLight));
} // for i - m_Sections[]
}
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cChunkData::sChunkSection * cChunkData::Allocate(void)
{
return m_Pool.Allocate();
}
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void cChunkData::Free(cChunkData::sChunkSection * a_Section)
{
m_Pool.Free(a_Section);
}
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void cChunkData::ZeroSection(cChunkData::sChunkSection * a_Section) const
{
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memset(a_Section->m_BlockTypes, 0x00, sizeof(a_Section->m_BlockTypes));
memset(a_Section->m_BlockMetas, 0x00, sizeof(a_Section->m_BlockMetas));
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memset(a_Section->m_BlockLight, 0x00, sizeof(a_Section->m_BlockLight));
memset(a_Section->m_BlockSkyLight, 0xff, sizeof(a_Section->m_BlockSkyLight));
}