Android WebVR implementation, Cardboard 0.5.5 SDK

content/browser/vr/vr_transform_util_unittest.cc

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <math.h>
+
+#include "content/browser/vr/vr_transform_util.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace content {
+
+const float kPi = 3.14159265f;
+
+void EXPECT_QUATERNION(
+    float x, float y, float z, float w,
+    const VRVector4Ptr& quat) {
+  EXPECT_NEAR(x, quat->x, 0.0001f);
+  EXPECT_NEAR(y, quat->y, 0.0001f);
+  EXPECT_NEAR(z, quat->z, 0.0001f);
+  EXPECT_NEAR(w, quat->w, 0.0001f);
+}
+
+TEST(VRTransformUtilTest, IdentityMatrixToQuaternion) {
+  float matrix[9] = {
+    1.0f, 0.0f, 0.0f,
+    0.0f, 1.0f, 0.0f,
+    0.0f, 0.0f, 1.0f
+  };
+
+  VRVector4Ptr orientation = MatrixToOrientationQuaternion(
+      &matrix[0], &matrix[3], &matrix[6]);
+
+  EXPECT_QUATERNION(0.0f, 0.0f, 0.0f, 1.0f, orientation);
+}
+
+TEST(VRTransformUtilTest, 90DegXMatrixToQuaternion) {
+  float rad = kPi * 0.5f;
+  float matrix[9] = {
+    1.0f, 0.0f, 0.0f,
+    0.0f, cosf(rad), -sinf(rad),
+    0.0f, sinf(rad), cosf(rad)
+  };
+
+  VRVector4Ptr orientation = MatrixToOrientationQuaternion(
+      &matrix[0], &matrix[3], &matrix[6]);
+
+  EXPECT_QUATERNION(0.7071f, 0.0f, 0.0f, 0.7071f, orientation);
+}
+
+TEST(VRTransformUtilTest, 180DegYMatrixToQuaternion) {
+  float matrix[9] = {
+    cosf(kPi), 0.0f, sinf(kPi),
+    0.0f, 1.0f, 0.0f,
+    -sinf(kPi), 0.0f, cosf(kPi)
+  };
+
+  VRVector4Ptr orientation = MatrixToOrientationQuaternion(
+      &matrix[0], &matrix[3], &matrix[6]);
+
+  EXPECT_QUATERNION(0.0f, 1.0f, 0.0f, 0.0f, orientation);
+}
+
+}  // namespace content