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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"
#include "ChunkData.h"
#include "BlockType.h"
namespace
{
struct SectionIndices
{
size_t Section = 0; // Index into m_Sections
size_t Index = 0; // Index into a single sChunkSection
};
inline SectionIndices IndicesFromRelPos(const Vector3i a_RelPos)
{
ASSERT(cChunkDef::IsValidRelPos(a_RelPos));
return {
static_cast<size_t>(a_RelPos.y / cChunkDef::SectionHeight),
cChunkDef::MakeIndex(a_RelPos.x, a_RelPos.y % cChunkDef::SectionHeight, a_RelPos.z)
};
}
bool IsCompressed(const size_t ElementCount)
{
return ElementCount != ChunkBlockData::SectionBlockCount;
}
template <size_t ElementCount, typename ValueType> ValueType UnpackDefaultValue(const ValueType DefaultValue)
{
if (IsCompressed(ElementCount))
{
return DefaultValue & 0xF;
}
return DefaultValue;
}
} // namespace
template <class ElementType, size_t ElementCount, ElementType DefaultValue>
void ChunkDataStore<ElementType, ElementCount, DefaultValue>::Assign(
const ChunkDataStore<ElementType, ElementCount, DefaultValue> & a_Other
)
{
for (size_t Y = 0; Y != cChunkDef::NumSections; Y++)
{
Store[Y].reset();
if (const auto & Other = a_Other.Store[Y]; Other != nullptr)
{
Store[Y] = std::make_unique<Type>(*Other);
}
}
}
template <class ElementType, size_t ElementCount, ElementType DefaultValue>
ElementType ChunkDataStore<ElementType, ElementCount, DefaultValue>::Get(const Vector3i a_Position) const
{
const auto Indices = IndicesFromRelPos(a_Position);
const auto & Section = Store[Indices.Section];
if (Section != nullptr)
{
if (IsCompressed(ElementCount))
{
return cChunkDef::ExpandNibble(Section->data(), Indices.Index);
}
else
{
return (*Section)[Indices.Index];
}
}
return UnpackDefaultValue<ElementCount>(DefaultValue);
}
template <class ElementType, size_t ElementCount, ElementType DefaultValue>
typename ChunkDataStore<ElementType, ElementCount, DefaultValue>::Type * ChunkDataStore<
ElementType,
ElementCount,
DefaultValue>::GetSection(const size_t a_Y) const
{
return Store[a_Y].get();
}
template <class ElementType, size_t ElementCount, ElementType DefaultValue>
void ChunkDataStore<ElementType, ElementCount, DefaultValue>::Set(const Vector3i a_Position, const ElementType a_Value)
{
const auto Indices = IndicesFromRelPos(a_Position);
auto & Section = Store[Indices.Section];
if (Section == nullptr)
{
if (a_Value == UnpackDefaultValue<ElementCount>(DefaultValue))
{
return;
}
Section = cpp20::make_unique_for_overwrite<Type>();
std::fill(Section->begin(), Section->end(), DefaultValue);
}
if (IsCompressed(ElementCount))
{
cChunkDef::PackNibble(Section->data(), Indices.Index, a_Value);
}
else
{
(*Section)[Indices.Index] = a_Value;
}
}
template <class ElementType, size_t ElementCount, ElementType DefaultValue>
void ChunkDataStore<ElementType, ElementCount, DefaultValue>::SetSection(
const ElementType (&a_Source)[ElementCount],
const size_t a_Y
)
{
auto & Section = Store[a_Y];
const auto SourceEnd = std::end(a_Source);
if (Section != nullptr)
{
std::copy(a_Source, SourceEnd, Section->begin());
}
else if (std::any_of(a_Source, SourceEnd, [](const auto Value) { return Value != DefaultValue; }))
{
Section = cpp20::make_unique_for_overwrite<Type>();
std::copy(a_Source, SourceEnd, Section->begin());
}
}
template <class ElementType, size_t ElementCount, ElementType DefaultValue>
void ChunkDataStore<ElementType, ElementCount, DefaultValue>::SetAll(const ElementType (&a_Source
)[cChunkDef::NumSections * ElementCount])
{
for (size_t Y = 0; Y != cChunkDef::NumSections; Y++)
{
SetSection(*reinterpret_cast<const ElementType(*)[ElementCount]>(a_Source + Y * ElementCount), Y);
}
}
void ChunkBlockData::Assign(const ChunkBlockData & a_Other)
{
m_Blocks.Assign(a_Other.m_Blocks);
m_Metas.Assign(a_Other.m_Metas);
}
void ChunkBlockData::SetAll(const cChunkDef::BlockTypes & a_BlockSource, const cChunkDef::BlockNibbles & a_MetaSource)
{
m_Blocks.SetAll(a_BlockSource);
m_Metas.SetAll(a_MetaSource);
}
void ChunkBlockData::SetSection(
const SectionType & a_BlockSource,
const SectionMetaType & a_MetaSource,
const size_t a_Y
)
{
m_Blocks.SetSection(a_BlockSource, a_Y);
m_Metas.SetSection(a_MetaSource, a_Y);
}
void ChunkLightData::Assign(const ChunkLightData & a_Other)
{
m_BlockLights.Assign(a_Other.m_BlockLights);
m_SkyLights.Assign(a_Other.m_SkyLights);
}
void ChunkLightData::SetAll(
const cChunkDef::BlockNibbles & a_BlockLightSource,
const cChunkDef::BlockNibbles & a_SkyLightSource
)
{
m_BlockLights.SetAll(a_BlockLightSource);
m_SkyLights.SetAll(a_SkyLightSource);
}
void ChunkLightData::SetSection(
const SectionType & a_BlockLightSource,
const SectionType & a_SkyLightSource,
const size_t a_Y
)
{
m_BlockLights.SetSection(a_BlockLightSource, a_Y);
m_SkyLights.SetSection(a_SkyLightSource, a_Y);
}
template struct ChunkDataStore<BLOCKTYPE, ChunkBlockData::SectionBlockCount, ChunkBlockData::DefaultValue>;
template struct ChunkDataStore<NIBBLETYPE, ChunkBlockData::SectionMetaCount, ChunkLightData::DefaultBlockLightValue>;
template struct ChunkDataStore<NIBBLETYPE, ChunkLightData::SectionLightCount, ChunkLightData::DefaultSkyLightValue>;
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