From bb23288c3db0d16b4cdd1e98b549dd77313cda9d Mon Sep 17 00:00:00 2001
From: Vladislav Vinogradov <no@email>
Date: Mon, 30 Jan 2012 07:59:14 +0000
Subject: [PATCH] fixed bug in SURF_GPU

---
 modules/gpu/src/cuda/surf.cu | 8 +++-----
 modules/gpu/src/surf.cpp     | 4 +++-
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/modules/gpu/src/cuda/surf.cu b/modules/gpu/src/cuda/surf.cu
index 1325c95e32..67d474dd9e 100644
--- a/modules/gpu/src/cuda/surf.cu
+++ b/modules/gpu/src/cuda/surf.cu
@@ -503,9 +503,7 @@ namespace cv { namespace gpu { namespace device
         __constant__ float c_NY[2][5] = {{0, 0, 4, 2, 1}, {0, 2, 4, 4, -1}};
 
         __global__ void icvCalcOrientation(const float* featureX, const float* featureY, const float* featureSize, float* featureDir)
-        {        
-            #if defined (__CUDA_ARCH__) && __CUDA_ARCH__ >= 110
-
+        {
             __shared__ float s_X[128];
             __shared__ float s_Y[128];
             __shared__ float s_angle[128];
@@ -597,6 +595,8 @@ namespace cv { namespace gpu { namespace device
                         bestx = sumx;
                         besty = sumy;
                     }
+
+                    __syncthreads();
                 }
 
                 if (threadIdx.x == 0)
@@ -642,8 +642,6 @@ namespace cv { namespace gpu { namespace device
                     featureDir[blockIdx.x] = kp_dir;
                 }
             }
-
-            #endif
         }
 
         #undef ORI_SEARCH_INC
diff --git a/modules/gpu/src/surf.cpp b/modules/gpu/src/surf.cpp
index b833312635..a083200763 100644
--- a/modules/gpu/src/surf.cpp
+++ b/modules/gpu/src/surf.cpp
@@ -200,7 +200,9 @@ namespace
 
             keypoints.cols = featureCounter;
 
-            if (!upright)
+            if (upright)
+                keypoints.row(SURF_GPU::SF_DIR).setTo(Scalar::all(90.0));
+            else
                 findOrientation(keypoints);
         }