SPV: Add OpSource shader source code and file name.

glslang/MachineIndependent/ShaderLang.cpp

@@ -728,6 +728,11 @@ bool ProcessDeferred(
         intermediate.setOriginUpperLeft();
     if ((messages & EShMsgHlslOffsets) || (messages & EShMsgReadHlsl))
         intermediate.setHlslOffsets();
+    if (messages & EShMsgDebugInfo) {
+        intermediate.setSourceFile(names[numPre]);
+        for (int s = 0; s < numStrings; ++s)
+            intermediate.addSourceText(strings[numPre]);
+    }
     SetupBuiltinSymbolTable(version, profile, spvVersion, source);
 
     TSymbolTable* cachedTable = SharedSymbolTables[MapVersionToIndex(version)]

glslang/MachineIndependent/localintermediate.h

@@ -451,6 +451,11 @@ public:
         return semanticNameSet.insert(name).first->c_str();
     }
 
+    void setSourceFile(const char* file) { sourceFile = file; }
+    const std::string& getSourceFile() const { return sourceFile; }
+    void addSourceText(const char* text) { sourceText = sourceText + text; }
+    const std::string& getSourceText() const { return sourceText; }
+
     const char* const implicitThisName = "@this";
 
 protected:
@@ -541,6 +546,10 @@ protected:
 
     EShTextureSamplerTransformMode textureSamplerTransformMode;
 
+    // source code of shader, useful as part of debug information
+    std::string sourceFile;
+    std::string sourceText;
+
 private:
     void operator=(TIntermediate&); // prevent assignments
 };

glslang/Public/ShaderLang.h

@@ -157,6 +157,7 @@ enum EShMessages {
     EShMsgCascadingErrors  = (1 << 7),  // get cascading errors; risks error-recovery issues, instead of an early exit
     EShMsgKeepUncalled     = (1 << 8),  // for testing, don't eliminate uncalled functions
     EShMsgHlslOffsets      = (1 << 9),  // allow block offsets to follow HLSL rules instead of GLSL rules
+    EShMsgDebugInfo        = (1 << 10), // save debug information
 };
 
 //