util: add util_format_is_plain

diff --git a/src/gallium/auxiliary/util/u_format.h b/src/gallium/auxiliary/util/u_format.h
index fb6ade5c06b5f1b7739b9b0ae1439f4df8a51a5c..6514315ea286ca179f2b08e4d82b660ae933bd3c 100644 (file)
--- a/src/gallium/auxiliary/util/u_format.h
+++ b/src/gallium/auxiliary/util/u_format.h
@@ -338,6 +338,21 @@ util_format_name(enum pipe_format format)
    return desc->name;
 }
 
+/**
+ * Whether this format is plain, see UTIL_FORMAT_LAYOUT_PLAIN for more info.
+ */
+static INLINE boolean
+util_format_is_plain(enum pipe_format format)
+{
+   const struct util_format_description *desc = util_format_description(format);
+
+   if (!format) {
+      return FALSE;
+   }
+
+   return desc->layout == UTIL_FORMAT_LAYOUT_PLAIN ? TRUE : FALSE;
+}
+
 static INLINE boolean 
 util_format_is_s3tc(enum pipe_format format)
 {