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-rw-r--r--src/mesa/swrast/s_texture.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/mesa/swrast/s_texture.c b/src/mesa/swrast/s_texture.c
index e31cd62679b..ffd78a2b895 100644
--- a/src/mesa/swrast/s_texture.c
+++ b/src/mesa/swrast/s_texture.c
@@ -189,6 +189,9 @@ _swrast_map_teximage(struct gl_context *ctx,
stride = _mesa_format_row_stride(texImage->TexFormat, texImage->Width);
_mesa_get_format_block_size(texImage->TexFormat, &bw, &bh);
+ assert(x % bw == 0);
+ assert(y % bh == 0);
+
if (!swImage->Buffer) {
/* probably ran out of memory when allocating tex mem */
*mapOut = NULL;