Create reflection.hlsl

Author: devshgraphicsprogramming

include/nbl/builtin/hlsl/bxdf/reflection.hlsl

@@ -0,0 +1,41 @@
+// Copyright (C) 2018-2020 - 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_BUILTIN_HLSL_BXDF_REFLECTION_INCLUDED_
+#define _NBL_BUILTIN_HLSL_BXDF_REFLECTION_INCLUDED_
+
+#include <nbl/builtin/hlsl/bxdf/common.hlsl>
+
+namespace nbl
+{
+namespace hlsl
+{
+namespace bxdf
+{
+namespace reflection
+{
+
+template<class RayDirInfo>
+LightSample<RayDirInfo> cos_generate(const surface_interactions::Isotropic<RayDirInfo> interaction)
+{
+  return LightSample<RayDirInfo>(interaction.V.reflect(interaction.N,interaction.NdotV),interaction.NdotV,interaction.N);
+}
+template<class RayDirInfo>
+LightSample<RayDirInfo> cos_generate(const surface_interactions::Anisotropic<RayDirInfo> interaction)
+{
+  return LightSample<RayDirInfo>(interaction.V.reflect(interaction.N,interaction.NdotV),interaction.NdotV,interaction.T,interaction.B,interaction.N);
+}
+
+// for information why we don't check the relation between `V` and `L` or `N` and `H`, see comments for `nbl::hlsl::transmission::cos_quotient_and_pdf`
+template<typename SpectralBins>
+quotient_and_pdf<SpectralBins> cos_quotient_and_pdf()
+{
+  return quotient_and_pdf<SpectralBins>::create(SpectralBins(1.f),nbl::hlsl::numeric_limits<float>::inf());
+}
+
+}
+}
+}
+}
+
+#endif