diff --git a/src/gx/Buffer.cpp b/src/gx/Buffer.cpp
index c11006c..40073cf 100644
--- a/src/gx/Buffer.cpp
+++ b/src/gx/Buffer.cpp
@@ -192,6 +192,15 @@ CGxBuf* GxBufCreate(CGxPool* pool, uint32_t itemSize, uint32_t itemCount, uint32
     return g_theGxDevicePtr->BufCreate(pool, itemSize, itemCount, index);
 }
 
+void GxBufData(CGxBuf* buf, const void* data, uint32_t size, uint32_t offset) {
+    if (size == 0) {
+        size = buf->m_itemSize * buf->m_itemCount;
+    }
+
+    g_theGxDevicePtr->BufData(buf, data, size, offset);
+    buf->unk1C = 1;
+}
+
 char* GxBufLock(CGxBuf* buf) {
     return g_theGxDevicePtr->BufLock(buf);
 }
diff --git a/src/gx/Buffer.hpp b/src/gx/Buffer.hpp
index 96f24bf..ae6a6ef 100644
--- a/src/gx/Buffer.hpp
+++ b/src/gx/Buffer.hpp
@@ -27,6 +27,8 @@ uint32_t GxVertexAttribOffset(EGxVertexBufferFormat, EGxVertexAttrib);
 
 CGxBuf* GxBufCreate(CGxPool*, uint32_t, uint32_t, uint32_t);
 
+void GxBufData(CGxBuf* buf, const void* data, uint32_t size, uint32_t offset);
+
 char* GxBufLock(CGxBuf* buf);
 
 void GxBufUnlock(CGxBuf*, uint32_t);