mg2d: add a function for getting maximum supported fd_stencil

This is needed for the caller to know the number of boundary zones that
can be filled.

API bump.

3 files changed, 11 insertions, 1 deletions

diff --git a/libmg2d.v b/libmg2d.v
index a51d313..ec37512 100644
--- a/libmg2d.v
+++ b/libmg2d.v
@@ -1,4 +1,4 @@
-LIBMG2D_3 {
+LIBMG2D_4 {
     global: mg2d_*;
     local: *;
 };
diff --git a/mg2d.c b/mg2d.c
index 55b8ed9..6b94def 100644
--- a/mg2d.c
+++ b/mg2d.c
@@ -714,3 +714,8 @@ void mg2d_print_stats(MG2DContext *ctx, const char *prefix)
               other / 1e6, other / 1e3 / priv->count_solve);
 
 }
+
+unsigned int mg2d_max_fd_stencil(void)
+{
+    return FD_STENCIL_MAX;
+}
diff --git a/mg2d.h b/mg2d.h
index f697b76..834e717 100644
--- a/mg2d.h
+++ b/mg2d.h
@@ -302,4 +302,9 @@ void mg2d_solver_free(MG2DContext **ctx);
  */
 void mg2d_print_stats(MG2DContext *ctx, const char *prefix);
 
+/**
+ * @return maximum supported value of fd_stencil.
+ */
+unsigned int mg2d_max_fd_stencil(void);
+
 #endif /* MG2D_H */