diff --git a/glslang/CInterface/glslang_c_interface.cpp b/glslang/CInterface/glslang_c_interface.cpp
index 1dbdeec0..d4e3dff3 100644
--- a/glslang/CInterface/glslang_c_interface.cpp
+++ b/glslang/CInterface/glslang_c_interface.cpp
@@ -345,6 +345,11 @@ GLSLANG_EXPORT glslang_shader_t* glslang_shader_create(const glslang_input_t* in
     shader->shader->setEnvTarget(c_shader_target_language(input->target_language),
                                  c_shader_target_language_version(input->target_language_version));
 
+#ifdef ENABLE_HLSL
+    if (input->hlsl_functionality_1)
+        shader->shader->setEnvTargetHlslFunctionality1();
+#endif
+
     if (input->entrypoint != nullptr)
         shader->shader->setEntryPoint(input->entrypoint);
 
diff --git a/glslang/Include/glslang_c_interface.h b/glslang/Include/glslang_c_interface.h
index fd9d597c..10cebab5 100644
--- a/glslang/Include/glslang_c_interface.h
+++ b/glslang/Include/glslang_c_interface.h
@@ -220,6 +220,7 @@ typedef struct glslang_input_s {
     const char* entrypoint; // This is what actually gets called by the GPU. Best to leave it at 'main' or something so opengl doesn't trip over itself.
     const char* source_entrypoint; // This just renames the source entrypoint in the code to 'entrypoint' and should be what is used to set different entrypoint names.
     int invert_y;
+    int hlsl_functionality_1;
     int default_version;
     glslang_profile_t default_profile;
     int force_default_version_and_profile;