/* SPDX-License-Identifier: Apache-2.0
 * Copyright 2011-2022 Blender Foundation */

#include "testing/testing.h"

#include "util/transform.h"
#include "util/vector.h"

CCL_NAMESPACE_BEGIN

TEST(transform_motion_decompose, Degenerated)
{
  // Simple case: single degenerated matrix.
  {
    vector<Transform> motion = {transform_scale(0.0f, 0.0f, 0.0f)};
    vector<DecomposedTransform> decomp(motion.size());
    transform_motion_decompose(decomp.data(), motion.data(), motion.size());
    EXPECT_TRUE(transform_decomposed_isfinite_safe(&decomp[0]));
  }

  // Copy from previous to current.
  {
    vector<Transform> motion = {transform_rotate(M_PI_4_F, one_float3()),
                                transform_scale(0.0f, 0.0f, 0.0f)};
    vector<DecomposedTransform> decomp(motion.size());
    transform_motion_decompose(decomp.data(), motion.data(), motion.size());
    EXPECT_NEAR(len(decomp[1].x - decomp[0].x), 0.0f, 1e-6f);
  }

  // Copy from next to current.
  {
    vector<Transform> motion = {transform_scale(0.0f, 0.0f, 0.0f),
                                transform_rotate(M_PI_4_F, one_float3())};
    vector<DecomposedTransform> decomp(motion.size());
    transform_motion_decompose(decomp.data(), motion.data(), motion.size());
    EXPECT_NEAR(len(decomp[0].x - decomp[1].x), 0.0f, 1e-6f);
  }
}

CCL_NAMESPACE_END