From: Eduardo Lima Mitev <elima@igalia.com>
Date: Tue, 16 Jun 2015 18:53:28 +0000 (+0200)
Subject: i965/vec4: Add auxiliary func to build a writemask from a component size
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=a5a3287f7392356386aa305c791d94b6d5dde6cc;p=mesa.git

i965/vec4: Add auxiliary func to build a writemask from a component size

New method brw_writemask_for_size() will return a writemask with the first
'size' components activated.

Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>
---

diff --git a/src/mesa/drivers/dri/i965/brw_reg.h b/src/mesa/drivers/dri/i965/brw_reg.h
index 4867148c12f..31806f769bd 100644
--- a/src/mesa/drivers/dri/i965/brw_reg.h
+++ b/src/mesa/drivers/dri/i965/brw_reg.h
@@ -950,6 +950,12 @@ brw_set_writemask(struct brw_reg reg, unsigned mask)
    return reg;
 }
 
+static inline unsigned
+brw_writemask_for_size(unsigned n)
+{
+   return (1 << n) - 1;
+}
+
 static inline struct brw_reg
 negate(struct brw_reg reg)
 {