swrast: assert _swrast_map_teximage() x, y is multiple of block size

diff --git a/src/mesa/swrast/s_texture.c b/src/mesa/swrast/s_texture.c
index e31cd62679b00c1474e60dd1df20422fda015a08..ffd78a2b895e7e7ffb425f0c27aaae8408f1dadd 100644 (file)
--- 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;