wined3d: Avoid negative draw start indices.
diff --git a/dlls/wined3d/wined3d_private.h b/dlls/wined3d/wined3d_private.h
index 8b7170f..27f95c8 100644
--- a/dlls/wined3d/wined3d_private.h
+++ b/dlls/wined3d/wined3d_private.h
@@ -1201,7 +1201,8 @@
 
     /* Indices */
     IWineD3DIndexBuffer*      pIndexData;
-    UINT                      baseVertexIndex; /* Note: only used for d3d8 */
+    UINT                      baseVertexIndex;
+    UINT                      loadBaseVertexIndex; /* non-indexed drawing needs 0 here, indexed baseVertexIndex */
 
     /* Transform */
     WINED3DMATRIX             transforms[HIGHEST_TRANSFORMSTATE + 1];