port the named Fresnel list from the Mitsuba XML Loader to the Material Compiler Frontend IR

Author: devsh

examples_tests

@@ -650,6 +650,7 @@ class CFrontendIR : public CNodePool
 
 		// To quickly make a matching backface material from a frontface or vice versa
 		NBL_API TypedHandle<IExprNode> reciprocate(const TypedHandle<const IExprNode> other);
+		NBL_API TypedHandle<CFresnel> createNamedFresnel(const std::string_view name);
 
 		// IMPORTANT: Two BxDFs are not allowed to be multiplied together.
 		// NOTE: Right now all Spectral Variables are required to be Monochrome or 3 bucket fixed semantics, all the same wavelength.
@@ -687,7 +688,6 @@ class CFrontendIR : public CNodePool
 		}
 
 		core::vector<TypedHandle<const CLayer>> m_rootNodes;
-		// TODO: named material Fresnels
 };
 
 inline bool CFrontendIR::valid(const TypedHandle<const CLayer> rootHandle, system::logger_opt_ptr logger) const

include/nbl/asset/material_compiler3/CFrontendIR.h

@@ -3,6 +3,9 @@
 // For conditions of distribution and use, see copyright notice in nabla.h
 #include "nbl/asset/material_compiler3/CFrontendIR.h"
 
+#include "nbl/builtin/hlsl/complex.hlsl"
+#include "nbl/builtin/hlsl/portable/vector_t.hlsl"
+
 
 namespace nbl::asset::material_compiler3
 {
@@ -75,10 +78,113 @@ bool CFrontendIR::CCookTorrance::invalid(const SInvalidCheckArgs& args) const
 
 auto CFrontendIR::reciprocate(const TypedHandle<const IExprNode> other) -> TypedHandle<IExprNode>
 {
+	if (const auto* in=deref<CFresnel>({.untyped=other.untyped}); in)
+	{
+		auto fresnelH = _new<CFresnel>();
+		auto* fresnel = deref(fresnelH);
+		*fresnel = *in;
+		fresnel->reciprocateEtas = ~in->reciprocateEtas;
+		return fresnelH;
+	}
 	assert(false); // unimplemented
 	return {};
 }
 
+auto CFrontendIR::createNamedFresnel(const std::string_view name) -> TypedHandle<CFresnel>
+{
+	using complex32_t = hlsl::complex_t<float>;
+	using spectral_complex_t = hlsl::portable_vector_t<complex32_t,3>;
+	const static core::map<std::string_view,spectral_complex_t> creationLambdas = {
+#define SPECTRUM_MACRO(R,G,B,X,Y,Z) spectral_complex_t(complex32_t(R,X),complex32_t(G,Y),complex32_t(B,Z))
+		{"a-C",				SPECTRUM_MACRO(1.6855f, 1.065f, 1.727f,		0.0f, 0.009f, 0.0263f)},			// there is no "a-C", but "a-C:H; data from palik"
+		{"Ag",				SPECTRUM_MACRO(0.059481f, 0.055090f, 0.046878f,		4.1367f, 3.4574f, 2.8028f)},
+		{"Al",				SPECTRUM_MACRO(1.3404f, 0.95151f, 0.68603f,		7.3509f, 6.4542f, 5.6351f)},
+		{"AlAs",			SPECTRUM_MACRO(3.1451f, 3.2636f, 3.4543f,		0.0012319f, 0.0039041f, 0.012940f)},
+		{"AlAs_palik",		SPECTRUM_MACRO(3.145f, 3.273f, 3.570f,		0.0f, 0.000275f, 1.56f)},
+		{"Au",				SPECTRUM_MACRO(0.21415f, 0.52329f, 1.3319f,		3.2508f, 2.2714f, 1.8693f)},
+		{"Be",				SPECTRUM_MACRO(3.3884f, 3.2860f, 3.1238f,		3.1692f, 3.1301f, 3.1246f)},
+		{"Be_palik",		SPECTRUM_MACRO(3.46f, 3.30f, 3.19f,		3.18f, 3.18f, 3.16f)},
+		{"Cr",				SPECTRUM_MACRO(3.2246f, 2.6791f, 2.1411f,		4.2684f, 4.1664f, 3.9300f)},
+		{"CsI",				SPECTRUM_MACRO(1.7834f, 1.7978f, 1.8182f,		0.0f, 0.0f, 0.0f)},
+		{"CsI_palik",		SPECTRUM_MACRO(1.78006f, 1.79750f, 1.82315,		0.0f, 0.0f, 0.0f)},
+		{"Cu",				SPECTRUM_MACRO(0.32075f,1.09860f,1.2469f,		3.17900f,2.59220f,2.4562)},
+		{"Cu_palik",		SPECTRUM_MACRO(0.32000f, 1.04f, 1.16f,		3.15000f, 2.59f, 2.4f)},
+		{"Cu20",			SPECTRUM_MACRO(2.975f, 3.17f, 3.075f,		0.122f, 0.23f, 0.525f)},  // out of range beyond 2.5 um refractiveindex.info and similar websites, so data applied is same as from palik's data
+		{"Cu20_palik",	SPECTRUM_MACRO(2.975f, 3.17f, 3.075f,		0.122f, 0.23f, 0.525f)},
+		{"d-C",			SPECTRUM_MACRO(2.4123f, 2.4246f, 2.4349f,		0.0f, 0.0f, 0.0f)},
+		{"d-C_palik",		SPECTRUM_MACRO(2.4137f, 2.4272f, 2.4446f,		0.0f, 0.0f, 0.0f)},
+		{"Hg",			SPECTRUM_MACRO(1.8847f, 1.4764f, 1.1306f,		5.1147f, 4.5410f, 3.9896f)},
+		{"Hg_palik",		SPECTRUM_MACRO(1.850f, 1.460f, 1.100f,		5.100f, 4.600f, 3.990f)},
+		//{"HgTe",			SPECTRUM_MACRO(,,,		,,)},						// lack of length wave range for our purpose https://www.researchgate.net/publication/3714159_Dispersion_of_refractive_index_in_degenerate_mercury_cadmium_telluride
+		//{"HgTe_palik",		SPECTRUM_MACRO(,,,		,,)},					// the same in palik (wavelength beyond 2 um)			
+		{"Ir",			SPECTRUM_MACRO(2.4200f, 2.0795f, 1.7965f,		5.0665f, 4.6125f, 4.1120f)},
+		{"Ir_palik",		SPECTRUM_MACRO(2.44f, 2.17f, 1.87f,		4.52f, 4.24f, 3.79f)},
+		{"K",			SPECTRUM_MACRO(0.052350f, 0.048270f, 0.042580f,		1.6732f, 1.3919f, 1.1195f)},
+		{"K_palik",		SPECTRUM_MACRO(0.0525f, 0.0483f, 0.0427f,		1.67f, 1.39f, 1.12f)},
+		{"Li",			SPECTRUM_MACRO(0.14872f, 0.14726f, 0.19236f,		2.9594f, 2.5129f, 2.1144f)},
+		{"Li_palik",		SPECTRUM_MACRO(0.218f, 0.2093f, 0.229f,		2.848f, 2.369f, 2.226f)},
+		{"MgO",			SPECTRUM_MACRO(1.7357f, 1.7419f, 1.7501f,		0.0f, 0.0f, 0.0f)},
+		{"MgO_palik",		SPECTRUM_MACRO(1.7355f, 1.7414f, 1.74975f,		0.0f, 0.0f, 1.55f)},				 // Handbook of optical constants of solids vol 2 page 951, weird k compoment alone, no measurements and resoults
+		{"Mo",			SPECTRUM_MACRO(0.76709f, 0.57441f, 0.46711f,		8.5005f, 7.2352f, 6.1383f)},	   	// https://refractiveindex.info/?shelf=main&book=Mo&page=Werner comparing with palik - weird
+		{"Mo_palik",		SPECTRUM_MACRO(3.68f, 3.77f, 3.175f,		3.51f, 3.624f, 3.56f)},
+		{"Na_palik",			SPECTRUM_MACRO(0.0522f, 0.061f, 0.0667f,		2.535f, 2.196f, 1.861f)},
+		{"Nb",			SPECTRUM_MACRO(2.2775f, 2.2225f, 2.0050f,		3.2500f, 3.1325f, 3.0100f)},
+		{"Nb_palik",			SPECTRUM_MACRO(2.869f, 2.9235f, 2.738f,		2.867f, 2.8764f, 2.8983f)},
+		{"Ni_palik",			SPECTRUM_MACRO(1.921f, 1.744f, 1.651f,		3.615f, 3.168f, 2.753f)},
+		{"Rh",			SPECTRUM_MACRO(2.8490f, 2.6410f, 2.4310f,		3.5450f, 3.3150f, 3.1190f)},
+		{"Rh_palik",		SPECTRUM_MACRO(2.092f, 1.934f, 1.8256f,		5.472f, 4.902f, 4.5181f)},
+		{"Se",			SPECTRUM_MACRO(1.4420f, 1.4759f, 1.4501f,		0.018713f, 0.10233f, 0.18418f)},
+		{"Se_palik",		SPECTRUM_MACRO(3.346f, 3.013f, 3.068f,		0.6402f, 0.6711f, 0.553f)},
+		{"SiC",			SPECTRUM_MACRO(2.6398f, 2.6677f, 2.7069f,		0.0f, 0.0f, 0.0f)},
+		{"SiC_palik",		SPECTRUM_MACRO(2.6412f, 2.6684f, 2.7077f,		0.0f, 0.0f, 0.0f)},
+		{"SnTe",			SPECTRUM_MACRO(3.059f, 1.813f, 1.687f,		5.144f, 4.177f, 3.555f)},			   // no data except palik's resources, so data same as palik
+		{"SnTe_palik",		SPECTRUM_MACRO(3.059f, 1.813f, 1.687f,		5.144f, 4.177f, 3.555f)},
+		{"Ta",			SPECTRUM_MACRO(1.0683f, 1.1379f, 1.2243f,		5.5047f, 4.7432f, 4.0988f)},
+		{"Ta_palik",		SPECTRUM_MACRO(1.839f, 2.5875f, 2.8211f,		1.997f, 1.8683f, 2.0514f)},
+		{"Te",			SPECTRUM_MACRO(4.1277f, 3.2968f, 2.6239f,		2.5658f, 2.8789f, 2.7673f)},
+		{"Te_palik",		SPECTRUM_MACRO(5.8101f, 4.5213f, 3.3682f,		2.9428f, 3.7289f, 3.6783f)},
+		{"ThF4",			SPECTRUM_MACRO(1.5113f, 1.5152f, 1.5205f,		0.0f, 0.0f, 0.0f)},
+		{"ThF4_palik",		SPECTRUM_MACRO(1.520f, 1.5125f, 1.524f,		0.0f, 0.0f, 0.0f)},
+		{"TiC",			SPECTRUM_MACRO(3.0460f, 2.9815f, 2.8864f,		2.6585f, 2.4714f, 2.3987f)},
+		{"TiC_palik",		SPECTRUM_MACRO(3.0454f, 2.9763, 2.8674f,		2.6589f, 2.4695f, 2.3959f)},
+		{"TiO2",			SPECTRUM_MACRO(2.1362f, 2.1729f, 2.2298f,		0.0f, 0.0f, 0.0f)},
+		{"TiO2_palik",		SPECTRUM_MACRO(2.5925f, 2.676f, 2.78f,		0.0f, 0.0f, 0.0f)},
+		{"VC",			SPECTRUM_MACRO(3.0033f, 2.8936f, 2.8138f,		2.4981f, 2.3046f, 2.1913f)},
+		{"VC_palik",		SPECTRUM_MACRO(3.0038f, 2.8951f, 2.8184f,		2.4923f, 2.3107f, 2.1902f)},
+		{"V_palik",		SPECTRUM_MACRO(3.512f, 3.671f, 3.2178f,		2.9337, 3.069f, 3.3667f)},
+		{"VN",			SPECTRUM_MACRO(2.3429f, 2.2268f, 2.1550f,		2.4506f, 2.1345f, 1.8753f)},
+		{"VN_palik",		SPECTRUM_MACRO(2.3418f, 2.2239f, 2.1539f,		2.4498f, 2.1371f, 1.8776f)},		
+		{"W",		SPECTRUM_MACRO(0.96133f, 1.5474f, 2.1930f,		6.2902f, 5.1052f, 5.0325f)},
+		{"none",			SPECTRUM_MACRO(0.f,0.f,0.f,		0.f,0.f,0.f)}
+#undef SPECTRUM_MACRO
+	};
+	//
+	const auto found = creationLambdas.find(name);
+	if (found==creationLambdas.end())
+		return {};
+	//
+	const auto frH = _new<CFrontendIR::CFresnel>();
+	auto* fr = deref(frH);
+	fr->debugInfo = _new<CNodePool::CDebugInfo>(found->first);
+	{
+		CSpectralVariable::SCreationParams<3> params = {};
+		params.getSemantics() = CSpectralVariable::Semantics::Fixed3_SRGB;
+		params.knots.params[0].scale = found->second.x.real();
+		params.knots.params[1].scale = found->second.y.real();
+		params.knots.params[2].scale = found->second.z.real();
+		fr->orientedRealEta = _new<CSpectralVariable>(std::move(params));
+	}
+	{
+		CSpectralVariable::SCreationParams<3> params = {};
+		params.getSemantics() = CSpectralVariable::Semantics::Fixed3_SRGB;
+		params.knots.params[0].scale = found->second.x.imag();
+		params.knots.params[1].scale = found->second.y.imag();
+		params.knots.params[2].scale = found->second.z.imag();
+		fr->orientedImagEta = _new<CSpectralVariable>(std::move(params));
+	}
+	return frH;
+}
+
 void CFrontendIR::printDotGraph(std::ostringstream& str) const
 {
 	str << "digraph {\n";