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authorRoland Scheidegger <sroland@vmware.com>2010-02-17 16:41:30 +0100
committerRoland Scheidegger <sroland@vmware.com>2010-02-17 16:41:30 +0100
commitc2ad9e380121d43f8ac066b590f9929a56bd1b0f (patch)
treea9ad9400766eb4cb01c276b85d233b47b7a08d60
parentb0f9717105301ee85afee0d03ee7e62e3e883326 (diff)
util: new util_format_get_nr_components helper
-rw-r--r--src/gallium/auxiliary/util/u_format.h17
1 files changed, 17 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/util/u_format.h b/src/gallium/auxiliary/util/u_format.h
index 2fbbb83d4b..6345a11a8c 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.