diff --git a/Source/Resource/ImfLayerIndex.cpp b/Source/Resource/ImfLayerIndex.cpp
new file mode 100644
index 0000000..7ee4b69
--- /dev/null
+++ b/Source/Resource/ImfLayerIndex.cpp
@@ -0,0 +1,19 @@
+#include "Resource/ImfResource.h"
+
+// OFFSET: 0x00750550
+// FUNCTION: fn_07938
+int CImfRes::GetLayer(int priority, int action, int motion) {
+  if (priority >= 15 || action >= this->m_maxAction[priority] ||
+      motion >= this->m_maxMotion[priority][action]) {
+    return -1;
+  }
+
+  int numLayer = this->m_imfData.size();
+  for (int layer = 0; layer < numLayer; ++layer) {
+    if (this->m_imfData[layer][action].priority[motion] == priority) {
+      return layer;
+    }
+  }
+
+  return -1;
+}
diff --git a/Source/Resource/ImfResource.h b/Source/Resource/ImfResource.h
index 1f334f0..914ef68 100644
--- a/Source/Resource/ImfResource.h
+++ b/Source/Resource/ImfResource.h
@@ -15,6 +15,8 @@ class CImfRes : public CRes {
 public:
   bool Load(const char* name) override;
 
+  int GetLayer(int priority, int action, int motion);
+
 private:
   /* 0110 */ std::vector<std::vector<ImfData>> m_imfData;
   /* 011C */ int m_maxAction[15];
diff --git a/data/compile.json b/data/compile.json
index 1234e34..d506cba 100644
--- a/data/compile.json
+++ b/data/compile.json
@@ -532,6 +532,7 @@
   "Source/Resource/EZeffectResource.cpp": 3,
   "Source/Resource/GifLzw.cpp": 3,
   "Source/Resource/GifResource.cpp": 3,
+  "Source/Resource/ImfLayerIndex.cpp": 3,
   "Source/Resource/ImfResource.cpp": 3,
   "Source/Resource/Models/AnimatedModelResource.cpp": 3,
   "Source/Resource/Models/ModelMesh.cpp": 3,