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Add FieldOffsets class

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Jérôme Leclercq
2020-08-04 01:33:52 +02:00
parent 7736312c2f
commit 7fd3264d08
4 changed files with 356 additions and 0 deletions
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169
include/Nazara/Utility/FieldOffsets.inl Normal file
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// Copyright (C) 2019 Jérôme Leclercq
// This file is part of the "Nazara Engine - Utility module"
// For conditions of distribution and use, see copyright notice in Config.hpp
#include <Nazara/Utility/FieldOffsets.hpp>
#include <cassert>
#include <memory>
#include <Nazara/Utility/Debug.hpp>
namespace Nz
{
inline FieldOffsets::FieldOffsets(StructLayout layout) :
m_largestFieldAlignment(1),
m_offsetRounding(1),
m_size(0),
m_layout(layout)
{
}
inline std::size_t FieldOffsets::GetLargestFieldAlignement() const
{
return m_largestFieldAlignment;
}
inline std::size_t FieldOffsets::GetSize() const
{
return m_size;
}
inline std::size_t FieldOffsets::GetAlignement(StructLayout layout, StructFieldType fieldType)
{
switch (layout)
{
case StructLayout_Packed:
return 1;
case StructLayout_Std140:
{
switch (fieldType)
{
case StructFieldType_Bool1:
case StructFieldType_Float1:
case StructFieldType_Int1:
case StructFieldType_UInt1:
return 4;
case StructFieldType_Bool2:
case StructFieldType_Float2:
case StructFieldType_Int2:
case StructFieldType_UInt2:
return 2 * 4;
case StructFieldType_Bool3:
case StructFieldType_Float3:
case StructFieldType_Int3:
case StructFieldType_UInt3:
case StructFieldType_Bool4:
case StructFieldType_Float4:
case StructFieldType_Int4:
case StructFieldType_UInt4:
return 4 * 4;
case StructFieldType_Double1:
return 8;
case StructFieldType_Double2:
return 2 * 8;
case StructFieldType_Double3:
case StructFieldType_Double4:
return 4 * 8;
}
}
}
return 0;
}
inline std::size_t FieldOffsets::GetCount(StructFieldType fieldType)
{
switch (fieldType)
{
case StructFieldType_Bool1:
case StructFieldType_Double1:
case StructFieldType_Float1:
case StructFieldType_Int1:
case StructFieldType_UInt1:
return 1;
case StructFieldType_Bool2:
case StructFieldType_Double2:
case StructFieldType_Float2:
case StructFieldType_Int2:
case StructFieldType_UInt2:
return 2;
case StructFieldType_Bool3:
case StructFieldType_Double3:
case StructFieldType_Float3:
case StructFieldType_Int3:
case StructFieldType_UInt3:
return 3;
case StructFieldType_Bool4:
case StructFieldType_Double4:
case StructFieldType_Float4:
case StructFieldType_Int4:
case StructFieldType_UInt4:
return 4;
}
return 0;
}
inline std::size_t FieldOffsets::GetSize(StructFieldType fieldType)
{
switch (fieldType)
{
case StructFieldType_Bool1:
case StructFieldType_Float1:
case StructFieldType_Int1:
case StructFieldType_UInt1:
return 4;
case StructFieldType_Bool2:
case StructFieldType_Float2:
case StructFieldType_Int2:
case StructFieldType_UInt2:
return 2 * 4;
case StructFieldType_Bool3:
case StructFieldType_Float3:
case StructFieldType_Int3:
case StructFieldType_UInt3:
return 3 * 4;
case StructFieldType_Bool4:
case StructFieldType_Float4:
case StructFieldType_Int4:
case StructFieldType_UInt4:
return 4 * 4;
case StructFieldType_Double1:
return 8;
case StructFieldType_Double2:
return 2 * 8;
case StructFieldType_Double3:
return 3 * 8;
case StructFieldType_Double4:
return 4 * 8;
}
return 0;
}
inline std::size_t FieldOffsets::Align(std::size_t source, std::size_t alignment)
{
if (source == 0)
return source;
assert(alignment > 0);
return ((source + alignment - 1) / alignment) * alignment;
}
}
#include <Nazara/Utility/DebugOff.hpp>