diff --git a/inc/hgl/shadergen/ShaderCreateInfo.h b/inc/hgl/shadergen/ShaderCreateInfo.h
index c1210922..bfecdf16 100644
--- a/inc/hgl/shadergen/ShaderCreateInfo.h
+++ b/inc/hgl/shadergen/ShaderCreateInfo.h
@@ -37,6 +37,7 @@ protected:
 
     AnsiString mi_codes;
 
+    ArrayList<const char *> user_data_list;
     ArrayList<const char *> function_list;
     AnsiString main_function;
 
@@ -88,6 +89,7 @@ public:
     bool AddUBO(DescriptorSetType type,const UBODescriptor *sd);
     bool AddSampler(DescriptorSetType type,const SamplerDescriptor *sd);
 
+    void AddUserData(const char *str){user_data_list.Add(str);}
     void AddFunction(const char *str){function_list.Add(str);}
 
     void SetMaterialInstance(UBODescriptor *,const AnsiString &);
diff --git a/src/ShaderGen/ShaderCreateInfo.cpp b/src/ShaderGen/ShaderCreateInfo.cpp
index 6fd7d1e8..1fe8055a 100644
--- a/src/ShaderGen/ShaderCreateInfo.cpp
+++ b/src/ShaderGen/ShaderCreateInfo.cpp
@@ -358,6 +358,9 @@ bool ShaderCreateInfo::CreateShader(ShaderCreateInfo *last_sc)
 
     ProcOutput();
 
+    for(const char *str:user_data_list)
+        final_shader+=str;
+
     for(const char *str:function_list)
         final_shader+=str;