From: Roland Scheidegger <sroland@vmware.com>
Date: Wed, 17 Feb 2010 15:41:30 +0000 (+0100)
Subject: util: new util_format_get_nr_components helper
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=c2ad9e380121d43f8ac066b590f9929a56bd1b0f;p=mesa.git

util: new util_format_get_nr_components helper
---

diff --git a/src/gallium/auxiliary/util/u_format.h b/src/gallium/auxiliary/util/u_format.h
index 2fbbb83d4ba..6345a11a8cf 100644
--- a/src/gallium/auxiliary/util/u_format.h
+++ b/src/gallium/auxiliary/util/u_format.h
@@ -404,6 +404,23 @@ util_format_has_alpha(enum pipe_format format)
    }
 }
 
+/**
+ * Return the number of components stored.
+ * Formats with block size != 1x1 will always have 1 component (the block).
+ */
+static INLINE unsigned
+util_format_get_nr_components(enum pipe_format format)
+{
+   const struct util_format_description *desc = util_format_description(format);
+   unsigned chan;
+   unsigned nr_comp = 0;
+   for (chan = 0; chan < 4; chan++) {
+      if (desc->channel[chan].size != 0) {
+         nr_comp++;
+      }
+   }
+   return nr_comp;
+}
 
 /*
  * Format access functions.