Merge with mitsuba branch (fully working material compiler)

Author: Crisspl

examples_tests/18.MitsubaLoader/main.cpp

@@ -412,7 +412,7 @@ int main()
 		}
 	}
 
-	constexpr uint32_t ENVMAP_SAMPLE_COUNT = 16u;
+	constexpr uint32_t ENVMAP_SAMPLE_COUNT = 64u;
 	constexpr float LIGHT_INTENSITY_SCALE = 0.01f;
 
 	core::unordered_set<const asset::ICPURenderpassIndependentPipeline*> modifiedPipelines;

include/nbl/builtin/material_compiler/glsl/common.glsl

@@ -592,15 +592,13 @@ void instr_eval_and_pdf_execute(in instr_t instr, in MC_precomputed_t precomp, i
 
 			bool is_valid = true;
 			bool refraction = false;
-#ifdef OP_DIELECTRIC
-			if (op == OP_DIELECTRIC && nbl_glsl_isTransmissionPath(currInteraction.inner.isotropic.NdotV, s.NdotL))
+			if (nbl_glsl_isTransmissionPath(currInteraction.inner.isotropic.NdotV, s.NdotL))
 			{
 				nbl_glsl_calcAnisotropicMicrofacetCache(microfacet.inner, true, currInteraction.inner.isotropic.V.dir, s.L, currInteraction.inner.T, currInteraction.inner.B, currInteraction.inner.isotropic.N, s.NdotL, s.VdotL, eta, rcp_eta);
 				finalizeMicrofacet(microfacet);
 				refraction = true;
 			}
 			else
-#endif
 				microfacet = _microfacet;
 
 #if defined(OP_DIELECTRIC) || defined(OP_CONDUCTOR)

include/nbl/builtin/material_compiler/glsl/rasterization/impl.glsl

@@ -203,6 +203,7 @@ bxdf_eval_t runEvalStream(in MC_precomputed_t precomp, in instr_stream_t stream,
 	nbl_glsl_LightSample s = nbl_glsl_createLightSample(L, currInteraction.inner);
 	MC_microfacet_t microfacet;
 	microfacet.inner = nbl_glsl_calcAnisotropicMicrofacetCache(currInteraction.inner, s);
+	finalizeMicrofacet(microfacet);
 	for (uint i = 0u; i < stream.count; ++i)
 	{
 		instr_t instr = nbl_glsl_MC_fetchInstr(stream.offset+i);

src/nbl/ext/MitsubaLoader/CMitsubaMaterialCompilerFrontend.cpp

@@ -107,7 +107,7 @@ namespace MitsubaLoader
                 if (tex.image)
                     dst = std::move(tex);
                 else
-                    dst = IR::INode::color_t(1.f, 0.f, 0.f); // red in case of no texture
+                    dst = IR::INode::color_t(0.5f, 0.5f, 0.5f); // red in case of no texture
             }
             else dst = src.value.vvalue;
         };
@@ -478,6 +478,7 @@ auto CMitsubaMaterialCompilerFrontend::compileToIRTree(asset::material_compiler:
             else
                 ir_node = createIRNode(ir, node.bsdf);
         }
+        node.ir_node = ir_node;
 
         IRNode** dst = nullptr;
         if (node.parent_ix >= bfs.size())