1 files changed, 91 insertions, 0 deletions
diff --git a/tests/validation/CPP/Phase.cpp b/tests/validation/CPP/Phase.cpp
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+++ b/tests/validation/CPP/Phase.cpp
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+/*
+ * Copyright (c) 2017 ARM Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#include "Phase.h"
+
+namespace arm_compute
+{
+namespace test
+{
+namespace validation
+{
+namespace reference
+{
+template <typename T>
+SimpleTensor<uint8_t> phase(const SimpleTensor<T> &gx, const SimpleTensor<T> &gy, PhaseType phase_type)
+{
+    const float pi           = std::atan(1) * 4;
+    const float rad_to_deg   = 180.0f / pi;
+    const float scale_factor = 128.f / 180.f;
+    const float epsilon      = 1e-9f; // used to avoid division by zero
+
+    const float ninety      = scale_factor * 90.f;
+    const float one_eighty  = scale_factor * 180.f;
+    const float two_seventy = scale_factor * 270.f;
+
+    // unsigned: map to [0-255)
+    // signed:   map to [0-180) degrees
+    const float scale = (phase_type == PhaseType::UNSIGNED) ? rad_to_deg : rad_to_deg * scale_factor;
+
+    SimpleTensor<uint8_t> phase(gx.shape(), DataType::U8);
+
+    for(int i = 0; i < gx.num_elements(); ++i)
+    {
+        bool quad_two   = std::signbit(gx[i]) && !std::signbit(gy[i]);
+        bool quad_three = std::signbit(gx[i]) && std::signbit(gy[i]);
+        bool quad_four  = !std::signbit(gx[i]) && std::signbit(gy[i]);
+
+        float  x      = gy[i] / (gx[i] + epsilon);
+        double arctan = std::atan(x);
+
+        const bool is_negative = std::signbit(arctan);
+
+        // Radians to degrees conversion with applied scale factor
+        arctan = arctan * scale;
+
+        if(phase_type == PhaseType::UNSIGNED)
+        {
+            arctan = is_negative ? arctan + 180.f : arctan;
+        }
+        else
+        {
+            arctan = is_negative ? arctan + ninety : arctan;
+
+            // Choose correct quandrant
+            arctan = quad_two ? ninety + arctan : arctan;
+            arctan = quad_three ? one_eighty + arctan : arctan;
+            arctan = quad_four ? two_seventy + arctan : arctan;
+        }
+
+        phase[i] = saturate_cast<uint8_t>(arctan + 0.5f);
+    }
+
+    return phase;
+}
+
+template SimpleTensor<uint8_t> phase(const SimpleTensor<int16_t> &gx, const SimpleTensor<int16_t> &gy, PhaseType phase_type);
+template SimpleTensor<uint8_t> phase(const SimpleTensor<int32_t> &gx, const SimpleTensor<int32_t> &gy, PhaseType phase_type);
+} // namespace reference
+} // namespace validation
+} // namespace test
+} // namespace arm_compute