IR to HLSL reference backend

include/nbl/asset/material_compiler3/CReferenceUnidirectionalPathTracing.h

@@ -0,0 +1,60 @@
+// Copyright (C) 2018-2026 - 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_MATERIAL_COMPILER_V3_C_REFERENCE_UNIDIRECTIONAL_PATH_TRACING_H_INCLUDED_
+#define _NBL_ASSET_MATERIAL_COMPILER_V3_C_REFERENCE_UNIDIRECTIONAL_PATH_TRACING_H_INCLUDED_
+
+#include "nbl/asset/material_compiler3/IBackend.h"
+
+namespace nbl::asset::material_compiler3
+{
+
+class CReferenceUnidirectionalPathTracing final : public IBackend
+{
+public:
+    class CResult final : public IBackend::IResult
+    {
+    public:
+        std::string fragmentShaderSource_common;
+        std::string fragmentShaderSource_raytracingPipeline;    // only maps entry point to templated funcs
+    };
+
+    core::smart_refctd_ptr<CResult> compile(const CTrueIR* ir, const std::span<const CTrueIR::SMaterialHandle> materials, system::logger_opt_ptr logger);
+
+private:
+    struct TraversalNodeInfo
+    {
+        const CTrueIR::INode* node;
+        bool isTransmission;
+        bool needsNeighborVdotH;
+        system::logger_opt_ptr logger;
+    };
+
+    void traverseIRNode(const CTrueIR::INode* node, const CTrueIR* ir, system::logger_opt_ptr logger, core::vector<CTrueIR::typed_pointer_type<const CTrueIR::INode>>& nodeStack, core::unordered_map<CTrueIR::typed_pointer_type<const CTrueIR::INode>, TraversalNodeInfo>& nodeInfos);
+
+    std::string getHashAs4UintsString(const CTrueIR::INode* node, const CTrueIR* ir, const std::string& separator = ",") const;
+
+    bool isNodeTypeContributor(CTrueIR::INode::EFinalType type) const;
+    void getMaterialDeclarationCode(std::ostringstream& sstr, const CTrueIR::INode* node, const CTrueIR* ir);
+    void getCacheDefineCode(std::ostringstream& sstr, const TraversalNodeInfo& nodeInfo, const CTrueIR* ir);
+
+    void getCallableEntryPointsHLSLCode(std::ostringstream& sstr, const CTrueIR::INode* node, const CTrueIR* ir);
+    void getAlbedoHLSLCode(std::ostringstream& sstr, const TraversalNodeInfo& nodeInfo, const CTrueIR* ir);
+    void getNormalHLSLCode(std::ostringstream& sstr, const TraversalNodeInfo& nodeInfo, const CTrueIR* ir);
+    void getAOVThroughputHLSLCode(std::ostringstream& sstr, const TraversalNodeInfo& nodeInfo, const CTrueIR* ir);
+    void getTransparencyHLSLCode(std::ostringstream& sstr, const TraversalNodeInfo& nodeInfo, const CTrueIR* ir);
+    void getGenerateHLSLCode(std::ostringstream& sstr, const TraversalNodeInfo& nodeInfo, const CTrueIR* ir);
+    void getQuotientWeightHLSLCode(std::ostringstream& sstr, const TraversalNodeInfo& nodeInfo, const CTrueIR* ir);
+    void getEvalWeightHLSLCode(std::ostringstream& sstr, const TraversalNodeInfo& nodeInfo, const CTrueIR* ir);
+    void getEmissionHLSLCode(std::ostringstream& sstr, const TraversalNodeInfo& nodeInfo, const CTrueIR* ir);
+
+    void getCanGenerateHLSLCode(std::ostringstream& sstr, const TraversalNodeInfo& nodeInfo, const CTrueIR* ir);
+    void getChoiceTargetHLSLCode(std::ostringstream& sstr, const TraversalNodeInfo& nodeInfo, const CTrueIR* ir);
+
+    void getOrenNayarBxDFHLSLCode(const TraversalNodeInfo& nodeInfo, const CTrueIR* ir, std::string& bxdf_type);
+    void getCookTorranceBxDFHLSLCode(const TraversalNodeInfo& nodeInfo, const CTrueIR* ir, std::string& bxdf_type, std::string& fresnel_create);
+};
+
+}
+
+#endif

include/nbl/asset/material_compiler3/IBackend.h

@@ -0,0 +1,25 @@
+// Copyright (C) 2018-2026 - 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_MATERIAL_COMPILER_V3_I_BACKEND_H_INCLUDED_
+#define _NBL_ASSET_MATERIAL_COMPILER_V3_I_BACKEND_H_INCLUDED_
+
+#include "nbl/asset/material_compiler3/CTrueIR.h"
+
+namespace nbl::asset::material_compiler3
+{
+
+class IBackend : public core::IReferenceCounted
+{
+public:
+    class IResult : public core::IReferenceCounted
+    {
+
+    };
+
+    core::smart_refctd_ptr<IResult> compile(const CTrueIR*, const std::span<const CTrueIR::SMaterialHandle>);
+};
+
+}
+
+#endif

src/nbl/CMakeLists.txt

@@ -170,6 +170,7 @@ set(NBL_ASSET_SOURCES
 # Materials
 	asset/material_compiler3/CFrontendIR.cpp
 	asset/material_compiler3/CTrueIR.cpp
+	asset/material_compiler3/CReferenceUnidirectionalPathTracing.cpp
 
 # Shaders
 	asset/utils/ISPIRVOptimizer.cpp