From ebfaf4c5d871397d7de10f791907b2e7e0246fbd Mon Sep 17 00:00:00 2001
From: Alexander Karsakov <alexander.karsakov@itseez.com>
Date: Mon, 27 Oct 2014 15:38:44 +0300
Subject: [PATCH] Added checking that z is non zero to buildWarpPlaneMaps
 kernel

---
 modules/stitching/src/opencl/warpers.cl | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/modules/stitching/src/opencl/warpers.cl b/modules/stitching/src/opencl/warpers.cl
index 9d245893cf..a8f04a63cd 100644
--- a/modules/stitching/src/opencl/warpers.cl
+++ b/modules/stitching/src/opencl/warpers.cl
@@ -73,8 +73,10 @@ __kernel void buildWarpPlaneMaps(__global uchar * xmapptr, int xmap_step, int xm
             float y = fma(ck_rinv[3], x_, fma(ck_rinv[4], y_, ck_rinv[5] * ct1));
             float z = fma(ck_rinv[6], x_, fma(ck_rinv[7], y_, ck_rinv[8] * ct1));
 
-            x /= z;
-            y /= z;
+            if (z != 0)
+                x /= z, y /= z;
+            else
+                x = y = -1;
 
             xmap[0] = x;
             ymap[0] = y;