Add missing VFT related functions for IntersectionFunctionTable

Author: FlannyH

src/accelerator_structure.rs

@@ -345,6 +345,34 @@ impl IntersectionFunctionTableRef {
     pub fn set_function(&self, function: &FunctionHandleRef, index: NSUInteger) {
         unsafe { msg_send![self, setFunction: function atIndex: index] }
     }
+
+    pub fn set_visible_function_table(
+        &self,
+        visible_function_table: Option<&VisibleFunctionTableRef>,
+        buffer_index: NSUInteger,
+    ) {
+        unsafe {
+            msg_send![self, 
+            setVisibleFunctionTable:visible_function_table 
+            atBufferIndex:buffer_index]
+        }
+    }
+
+    pub fn set_visible_function_tables(
+        &self,
+        visible_function_tables: &[&VisibleFunctionTableRef],
+        buffer_start_index: NSUInteger,
+    ) {
+        unsafe {
+            msg_send![self, 
+                setVisibleFunctionTables:visible_function_tables.as_ptr()
+                withBufferRange: NSRange { 
+                    location: buffer_start_index,
+                    length: visible_function_tables.len() as _,
+                }
+            ]
+        }
+    }
 }
 
 /// See <https://developer.apple.com/documentation/metal/mtlvisiblefunctiontabledescriptor>