added main_function value and SetMain function at ShaderCreateInfo class.

inc/hgl/shadergen/ShaderCreateInfo.h

@@ -28,6 +28,7 @@ protected:
     AnsiString output_struct;
 
     AnsiStringList function_list;
+    AnsiString main_function;
 
     AnsiString final_shader;
 
@@ -67,6 +68,8 @@ public:
 
     void SetMaterialInstance(UBODescriptor *);
 
+    void SetMain(const AnsiString &str){main_function=str;}
+
     const AnsiString &GetOutputStruct()const{return output_struct;}
     const AnsiString &GetShaderSource()const{return final_shader;}