gallium/u_blit: bail out if src is a multisample texture

Reviewed-by: Brian Paul <brianp@vmware.com>

diff --git a/src/gallium/auxiliary/util/u_blit.c b/src/gallium/auxiliary/util/u_blit.c
index 1300872b043029d5a48fafafae9ffb48ca40679e..3887e65fbd43accf4738ee42e7092ff632b54983 100644 (file)
--- a/src/gallium/auxiliary/util/u_blit.c
+++ b/src/gallium/auxiliary/util/u_blit.c
@@ -507,6 +507,12 @@ util_blit_pixels(struct blit_state *ctx,
       return;
    }
 
+   /* XXX Reading multisample textures is unimplemented. */
+   assert(src_tex->nr_samples <= 1);
+   if (src_tex->nr_samples > 1) {
+      return;
+   }
+
    /* It's a mistake to call this function with a stencil format and
     * without shader stencil export. We don't do software fallbacks here.
     * Ignore stencil and only copy depth.