diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4f9378d..71f4c6f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -17,6 +17,7 @@ else ()
 endif ()
 
 include(add_shader.cmake)
+include(add_resource_dir.cmake)
 
 add_subdirectory("aster")
 add_subdirectory("samples")
diff --git a/add_resource_dir.cmake b/add_resource_dir.cmake
new file mode 100644
index 0000000..e414108
--- /dev/null
+++ b/add_resource_dir.cmake
@@ -0,0 +1,7 @@
+function(add_resource_dir TARGET DIR)
+    add_custom_command(
+            TARGET ${TARGET} POST_BUILD
+            COMMAND ${CMAKE_COMMAND} -E copy_directory
+            ${CMAKE_CURRENT_SOURCE_DIR}/${DIR}/
+            ${CMAKE_CURRENT_BINARY_DIR}/${DIR}/)
+endfunction(add_resource_dir)
\ No newline at end of file
diff --git a/samples/02_box/CMakeLists.txt b/samples/02_box/CMakeLists.txt
index 18d09c9..e3195e9 100644
--- a/samples/02_box/CMakeLists.txt
+++ b/samples/02_box/CMakeLists.txt
@@ -11,6 +11,4 @@ add_shader(box shader/box.frag.glsl)
 target_link_libraries(box PRIVATE aster_core)
 target_link_libraries(box PRIVATE util_helper)
 
-add_custom_target(copy-resource-files ALL
-        COMMAND ${CMAKE_COMMAND} -E copy_directory ${CMAKE_CURRENT_SOURCE_DIR}/image/ ${CMAKE_CURRENT_BINARY_DIR}/
-        DEPENDS box)
\ No newline at end of file
+add_resource_dir(box image)
\ No newline at end of file