Mesa (9.1): i965/vs: Fix flaky texture swizzling

[Carl Worth]

Module: Mesa
Branch: 9.1
Commit: f437513bed58749b812f1f773631eca3c70ec673
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=f437513bed58749b812f1f773631eca3c70ec673

Author: Chris Forbes <chrisf at ijw.co.nz>
Date:   Wed Jul 24 07:21:22 2013 +1200

i965/vs: Fix flaky texture swizzling

If any component used the ZERO or ONE swizzle, its corresponding member
in the `swizzle` array would never be initialized. We *mostly* got away
with this, except when that memory happened to contain a value that
clobbered another channel when combined using BRW_SWIZZLE4().

NOTE: This is a candidate for stable branches.

Signed-off-by: Chris Forbes <chrisf at ijw.co.nz>
Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>
(cherry picked from commit 124f567f1d575eaea98a6ae1d0a4687b8fb5bba2)

---

 src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
index a0b5c8c..86f9a33 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
@@ -2285,7 +2285,7 @@ vec4_visitor::swizzle_result(ir_texture *ir, src_reg orig_val, int sampler)
    }
 
    int zero_mask = 0, one_mask = 0, copy_mask = 0;
-   int swizzle[4];
+   int swizzle[4] = {0};
 
    for (int i = 0; i < 4; i++) {
       switch (GET_SWZ(s, i)) {