Restored CQuantNormalCache.h

Author: Przemog1

include/nbl/asset/utils/CQuantNormalCache.h

@@ -0,0 +1,68 @@
+// Copyright (C) 2018-2021 - DevSH Graphics Programming Sp. z O.O.
+// This file is part of the "Nabla Engine".
+// For conditions of distribution and use, see copyright notice in nabla.h
+
+#ifndef __NBL_ASSET_C_QUANT_NORMAL_CACHE_H_INCLUDED
+#define __NBL_ASSET_C_QUANT_NORMAL_CACHE_H_INCLUDED
+
+
+#include "nbl/asset/utils/CDirQuantCacheBase.h"
+
+
+namespace nbl 
+{
+namespace asset 
+{
+	
+namespace impl
+{
+
+struct VectorUV
+{
+	inline VectorUV(const core::vectorSIMDf& absNormal)
+	{
+		const float rcpManhattanNorm = 1.f / (absNormal.x + absNormal.y + absNormal.z);
+		u = absNormal.x * rcpManhattanNorm;
+		v = absNormal.z * rcpManhattanNorm;
+	}
+
+	inline bool operator==(const VectorUV& other) const
+	{
+		return (u == other.u && v == other.v);
+	}
+
+	float u;
+	float v;
+};
+
+struct QuantNormalHash
+{
+	inline size_t operator()(const VectorUV& vec) const noexcept
+	{
+		static constexpr size_t primeNumber1 = 18446744073709551557ull;
+		static constexpr size_t primeNumber2 = 4611686018427388273ull;
+				
+		return  ((static_cast<size_t>(static_cast<double>(vec.u)*(std::numeric_limits<size_t>::max)()) * primeNumber1) ^
+			(static_cast<size_t>(static_cast<double>(vec.v)*(std::numeric_limits<size_t>::max)()) * primeNumber2));
+	}
+};
+
+}
+
+
+class CQuantNormalCache : public CDirQuantCacheBase<impl::VectorUV,impl::QuantNormalHash,EF_A2B10G10R10_SNORM_PACK32,EF_R8G8B8_SNORM,EF_R16G16B16_SNORM>
+{
+		using Base = CDirQuantCacheBase<impl::VectorUV,impl::QuantNormalHash,EF_A2B10G10R10_SNORM_PACK32,EF_R8G8B8_SNORM,EF_R16G16B16_SNORM>;
+
+	public:
+		template<E_FORMAT CacheFormat>
+		value_type_t<CacheFormat> quantize(core::vectorSIMDf normal)
+		{
+			normal.makeSafe3D();
+			return Base::quantize<3u,CacheFormat>(normal);
+		}
+};
+
+}
+}
+#endif