mirror of https://github.com/axmolengine/axmol.git
45 lines
1.1 KiB
C++
45 lines
1.1 KiB
C++
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#include "config.h"
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#include "ambidefs.h"
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#include <cassert>
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namespace {
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constexpr std::array<float,MaxAmbiOrder+1> Ambi3DDecoderHFScale{{
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1.00000000e+00f, 1.00000000e+00f
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}};
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constexpr std::array<float,MaxAmbiOrder+1> Ambi3DDecoderHFScale2O{{
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7.45355990e-01f, 1.00000000e+00f, 1.00000000e+00f
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}};
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constexpr std::array<float,MaxAmbiOrder+1> Ambi3DDecoderHFScale3O{{
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5.89792205e-01f, 8.79693856e-01f, 1.00000000e+00f, 1.00000000e+00f
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}};
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inline auto& GetDecoderHFScales(uint order) noexcept
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{
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if(order >= 3) return Ambi3DDecoderHFScale3O;
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if(order == 2) return Ambi3DDecoderHFScale2O;
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return Ambi3DDecoderHFScale;
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}
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} // namespace
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auto AmbiScale::GetHFOrderScales(const uint in_order, const uint out_order) noexcept
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-> std::array<float,MaxAmbiOrder+1>
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{
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std::array<float,MaxAmbiOrder+1> ret{};
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assert(out_order >= in_order);
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const auto &target = GetDecoderHFScales(out_order);
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const auto &input = GetDecoderHFScales(in_order);
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for(size_t i{0};i < in_order+1;++i)
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ret[i] = input[i] / target[i];
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return ret;
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}
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