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Adds Int16/Uint16 -> Int8/Uint8 converters for multiple vertex color … #255

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Adds Int16/Uint16 -> Int8/Uint8 converters for multiple vertex color … #255

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19 changes: 19 additions & 0 deletions AssetLoader/src/GLTFBuilder.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -118,6 +118,25 @@ inline float ConvertElement<float, true, Uint16>(Uint16 Src)
}


// ========================== Int16/Uint16 -> Int8/Uint8 ===========================
template <>
inline Uint8 ConvertElement<Uint8, true, Uint16>(Uint16 Src)
{
return static_cast<Uint8>((static_cast<Uint32>(Src) * 255 + 128) / 65535);
}

template <>
inline Int8 ConvertElement<Int8, true, Int16>(Int16 Src)
{
// Scale from [-32768, 32767] ? [-128, 127] with rounding
// Use 32-bit math to avoid overflow
Int32 temp = static_cast<Int32>(Src) * 127; // multiply first
temp += (Src >= 0 ? 16384 : -16384); // add 0.5 for rounding
temp /= 32767; // scale down
return static_cast<Int8>(temp);
}


template <typename SrcType, typename DstType, bool IsNormalized>
inline void WriteGltfData(const void* pSrc,
Uint32 NumComponents,
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