71 lines
3 KiB
C++
71 lines
3 KiB
C++
// SPDX-License-Identifier: BSD-2-Clause
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// This code is part of the sfizz library and is licensed under a BSD 2-clause
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// license. You should have receive a LICENSE.md file along with the code.
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// If not, contact the sfizz maintainers at https://github.com/sfztools/sfizz
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#include "sfizz/Interpolators.h"
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#include "catch2/catch.hpp"
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#include <algorithm>
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using namespace Catch::literals;
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TEST_CASE("[Interpolators] Sample at points")
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{
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std::array<float, 32> values;
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std::iota(values.begin(), values.end(), 0.0f);
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for (unsigned i = 2; i < values.size() - 2; ++i) {
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REQUIRE(sfz::interpolate<sfz::InterpolatorModel::kInterpolatorLinear>(&values[i], 0.0f)
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== Approx(values[i]).margin(1e-2));
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REQUIRE(sfz::interpolate<sfz::InterpolatorModel::kInterpolatorHermite3>(&values[i], 0.0f)
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== Approx(values[i]).margin(1e-2));
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REQUIRE(sfz::interpolate<sfz::InterpolatorModel::kInterpolatorBspline3>(&values[i], 0.0f)
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== Approx(values[i]).margin(1e-2));
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}
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}
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TEST_CASE("[Interpolators] Sample next")
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{
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std::array<float, 32> values;
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std::iota(values.begin(), values.end(), 0.0f);
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for (unsigned i = 2; i < values.size() - 2; ++i) {
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REQUIRE(sfz::interpolate<sfz::InterpolatorModel::kInterpolatorLinear>(&values[i], 1.0f)
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== Approx(values[i + 1]).margin(1e-2));
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REQUIRE(sfz::interpolate<sfz::InterpolatorModel::kInterpolatorHermite3>(&values[i], 1.0f)
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== Approx(values[i + 1]).margin(1e-2));
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REQUIRE(sfz::interpolate<sfz::InterpolatorModel::kInterpolatorBspline3>(&values[i], 1.0f)
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== Approx(values[i + 1]).margin(1e-2));
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}
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}
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TEST_CASE("[Interpolators] Straight line")
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{
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std::array<float, 32> values;
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std::iota(values.begin(), values.end(), 0.0f);
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for (unsigned i = 2; i < values.size() - 2; ++i) {
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REQUIRE(sfz::interpolate<sfz::InterpolatorModel::kInterpolatorLinear>(&values[i], 0.5f)
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== Approx(values[i] + 0.5f).margin(1e-2));
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REQUIRE(sfz::interpolate<sfz::InterpolatorModel::kInterpolatorHermite3>(&values[i], 0.5f)
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== Approx(values[i] + 0.5f).margin(1e-2));
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REQUIRE(sfz::interpolate<sfz::InterpolatorModel::kInterpolatorBspline3>(&values[i], 0.5f)
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== Approx(values[i] + 0.5f).margin(1e-2));
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}
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}
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TEST_CASE("[Interpolators] Squares")
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{
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std::array<float, 32> x;
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std::array<float, 32> y;
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for (unsigned i = 0; i < x.size(); ++i) {
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x[i] = static_cast<float>(i) / static_cast<float>(x.size());
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y[i] = x[i] * x[i];
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}
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for (unsigned i = 2; i < x.size() - 2; ++i) {
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const auto half_x = x[i] + 0.5f / static_cast<float>(x.size());
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const auto expected = (half_x) * (half_x);
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REQUIRE(sfz::interpolate<sfz::InterpolatorModel::kInterpolatorHermite3>(&y[i], 0.5f)
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== Approx(expected).margin(1e-2));
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REQUIRE(sfz::interpolate<sfz::InterpolatorModel::kInterpolatorBspline3>(&y[i], 0.5f)
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== Approx(expected).margin(1e-2));
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}
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}
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