diff --git a/src/gx/CGxDevice.hpp b/src/gx/CGxDevice.hpp
index be142f0..312ae15 100644
--- a/src/gx/CGxDevice.hpp
+++ b/src/gx/CGxDevice.hpp
@@ -120,7 +120,7 @@ class CGxDevice {
         virtual void PoolSizeSet(CGxPool*, uint32_t) = 0;
         virtual char* BufLock(CGxBuf*);
         virtual int32_t BufUnlock(CGxBuf*, uint32_t);
-        virtual void BufData(CGxBuf*, void*, size_t, uintptr_t);
+        virtual void BufData(CGxBuf* buf, void* data, size_t size, uintptr_t offset);
         virtual int32_t TexCreate(EGxTexTarget, uint32_t, uint32_t, uint32_t, EGxTexFormat, EGxTexFormat, CGxTexFlags, void*, void (*)(EGxTexCommand, uint32_t, uint32_t, uint32_t, uint32_t, void*, uint32_t&, const void*&), const char*, CGxTex*&);
         virtual void TexDestroy(CGxTex* texId);
         virtual void ShaderCreate(CGxShader*[], EGxShTarget, const char*, const char*, int32_t);
diff --git a/src/gx/d3d/CGxDeviceD3d.hpp b/src/gx/d3d/CGxDeviceD3d.hpp
index edea738..9a59d20 100644
--- a/src/gx/d3d/CGxDeviceD3d.hpp
+++ b/src/gx/d3d/CGxDeviceD3d.hpp
@@ -258,7 +258,7 @@ class CGxDeviceD3d : public CGxDevice {
     virtual void PoolSizeSet(CGxPool* pool, uint32_t size);
     virtual char* BufLock(CGxBuf* buf);
     virtual int32_t BufUnlock(CGxBuf* buf, uint32_t size);
-    virtual void BufData(CGxBuf*, void*, size_t, uintptr_t);
+    virtual void BufData(CGxBuf* buf, void* data, size_t size, uintptr_t offset);
     virtual void IShaderCreate(CGxShader* shader);
     virtual void ShaderCreate(CGxShader* shaders[], EGxShTarget target, const char* a4, const char* a5, int32_t permutations);
     virtual int32_t StereoEnabled();
diff --git a/src/gx/gll/CGxDeviceGLL.hpp b/src/gx/gll/CGxDeviceGLL.hpp
index df6cb89..e5940cc 100644
--- a/src/gx/gll/CGxDeviceGLL.hpp
+++ b/src/gx/gll/CGxDeviceGLL.hpp
@@ -43,7 +43,7 @@ class CGxDeviceGLL : public CGxDevice {
         virtual void PoolSizeSet(CGxPool*, uint32_t);
         virtual char* BufLock(CGxBuf*);
         virtual int32_t BufUnlock(CGxBuf*, uint32_t);
-        virtual void BufData(CGxBuf*, void*, size_t, uintptr_t);
+        virtual void BufData(CGxBuf* buf, void* data, size_t size, uintptr_t offset);
         virtual void TexDestroy(CGxTex* texId);
         virtual void IShaderCreate(CGxShader*);
         virtual void ShaderCreate(CGxShader*[], EGxShTarget, const char*, const char*, int32_t);