updated gpu accuracy tests

added posibility to specify device on which tests will be executed

modules/gpu/test/utility.hpp

@@ -80,14 +80,23 @@ cv::Mat readImageType(const std::string& fname, int type);
 //! return true if device supports specified feature and gpu module was built with support the feature.
 bool supportFeature(const cv::gpu::DeviceInfo& info, cv::gpu::FeatureSet feature);
 
-//! return all devices compatible with current gpu module build.
-const std::vector<cv::gpu::DeviceInfo>& devices();
+class DeviceManager
+{
+public:
+    static DeviceManager& instance();
 
-//! return all devices compatible with current gpu module build which support specified feature.
-std::vector<cv::gpu::DeviceInfo> devices(cv::gpu::FeatureSet feature);
+    void load(int i);
+    void loadAll();
 
-#define ALL_DEVICES testing::ValuesIn(devices())
-#define DEVICES(feature) testing::ValuesIn(devices(feature))
+    const std::vector<cv::gpu::DeviceInfo>& values() const { return devices_; }
+
+private:
+    std::vector<cv::gpu::DeviceInfo> devices_;
+};
+
+testing::internal::ParamGenerator<cv::gpu::DeviceInfo> DevicesGenerator_();
+
+#define ALL_DEVICES DevicesGenerator_()
 
 //////////////////////////////////////////////////////////////////////
 // Additional assertion