d3d8: Store the fvf in the d3d8 vertex buffer.

dlls/d3d8/d3d8_private.h

@@ -326,6 +326,8 @@ struct IDirect3DVertexBuffer8Impl
 
     /* Parent reference */
     LPDIRECT3DDEVICE8                 parentDevice;
+
+    DWORD                             fvf;
 };
 
 /* --------------------- */

dlls/d3d8/device.c

@@ -739,6 +739,7 @@ static HRESULT WINAPI IDirect3DDevice8Impl_CreateVertexBuffer(LPDIRECT3DDEVICE8
     EnterCriticalSection(&d3d8_cs);
     hrc = IWineD3DDevice_CreateVertexBuffer(This->WineD3DDevice, Size, Usage & WINED3DUSAGE_MASK, FVF, (WINED3DPOOL) Pool, &(object->wineD3DVertexBuffer), NULL, (IUnknown *)object);
     LeaveCriticalSection(&d3d8_cs);
+    object->fvf = FVF;
 
     if (D3D_OK != hrc) {
 

dlls/d3d8/vertexbuffer.c

@@ -194,7 +194,7 @@ static HRESULT WINAPI IDirect3DVertexBuffer8Impl_GetDesc(LPDIRECT3DVERTEXBUFFER8
         pDesc->Usage = desc.Usage;
         pDesc->Pool = desc.Pool;
         pDesc->Size = desc.Size;
-        pDesc->FVF = desc.FVF;
+        pDesc->FVF = This->fvf;
         pDesc->Format = d3dformat_from_wined3dformat(desc.Format);
     }