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1 // Copyright 2017 The Chromium Authors. All rights reserved. | 1 // Copyright 2017 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #define _USE_MATH_DEFINES // For VC++ to get M_PI. This has to be first. | 5 #define _USE_MATH_DEFINES // For VC++ to get M_PI. This has to be first. |
6 | 6 |
7 #include <cmath> | 7 #include <cmath> |
8 | 8 |
9 #include "base/macros.h" | 9 #include "base/macros.h" |
10 #include "testing/gtest/include/gtest/gtest.h" | 10 #include "testing/gtest/include/gtest/gtest.h" |
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135 } | 135 } |
136 } | 136 } |
137 | 137 |
138 TEST(QuatTest, SlerpOppositeAngles) { | 138 TEST(QuatTest, SlerpOppositeAngles) { |
139 Vector3dF axis(1, 1, 1); | 139 Vector3dF axis(1, 1, 1); |
140 double start_radians = -M_PI_2; | 140 double start_radians = -M_PI_2; |
141 double stop_radians = M_PI_2; | 141 double stop_radians = M_PI_2; |
142 Quaternion start(axis, start_radians); | 142 Quaternion start(axis, start_radians); |
143 Quaternion stop(axis, stop_radians); | 143 Quaternion stop(axis, stop_radians); |
144 | 144 |
145 // When quaternions are pointed in the fully opposite direction, we take the | 145 // When quaternions are pointed in the fully opposite direction, this is |
146 // interpolated quaternion to be the first. This is arbitrary, but if we | 146 // ambiguous, so we rotate as per https://www.w3.org/TR/css-transforms-1/ |
147 // change this policy, this test should fail. | 147 Quaternion expected(axis, 0); |
148 Quaternion expected = start; | |
149 | 148 |
150 for (size_t i = 0; i < 100; ++i) { | 149 Quaternion interpolated = start.Slerp(stop, 0.5f); |
151 float t = static_cast<float>(i) / 100.0f; | 150 EXPECT_NEAR(expected.x(), interpolated.x(), kEpsilon); |
152 Quaternion interpolated = start.Slerp(stop, t); | 151 EXPECT_NEAR(expected.y(), interpolated.y(), kEpsilon); |
153 CompareQuaternions(expected, interpolated); | 152 EXPECT_NEAR(expected.z(), interpolated.z(), kEpsilon); |
154 } | 153 EXPECT_NEAR(expected.w(), interpolated.w(), kEpsilon); |
155 } | 154 } |
156 | 155 |
157 } // namespace gfx | 156 } // namespace gfx |
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