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-rw-r--r--src/mesa/main/varray.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/mesa/main/varray.h b/src/mesa/main/varray.h
index 0be57971bd7..2831720edfc 100644
--- a/src/mesa/main/varray.h
+++ b/src/mesa/main/varray.h
@@ -316,6 +316,9 @@ static inline unsigned
_mesa_primitive_restart_index(const struct gl_context *ctx,
unsigned index_size)
{
+ /* The index_size parameter is menat to be in bytes. */
+ assert(index_size == 1 || index_size == 2 || index_size == 4);
+
/* From the OpenGL 4.3 core specification, page 302:
* "If both PRIMITIVE_RESTART and PRIMITIVE_RESTART_FIXED_INDEX are
* enabled, the index value determined by PRIMITIVE_RESTART_FIXED_INDEX