mirror of
https://github.com/TorqueGameEngines/Torque3D.git
synced 2026-03-24 14:49:27 +00:00
a745fc3757
added libraries: opus flac libsndfile updated: libvorbis libogg openal - Everything works as expected for now. Bare in mind libsndfile needed the check for whether or not it could find the xiph libraries removed in order for this to work.
214 lines
7.3 KiB
C++
214 lines
7.3 KiB
C++
#ifndef PHASE_SHIFTER_H
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#define PHASE_SHIFTER_H
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#ifdef HAVE_SSE_INTRINSICS
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#include <xmmintrin.h>
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#elif defined(HAVE_NEON)
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#include <arm_neon.h>
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#endif
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#include <array>
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#include <stddef.h>
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#include "alcomplex.h"
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#include "alspan.h"
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/* Implements a wide-band +90 degree phase-shift. Note that this should be
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* given one sample less of a delay (FilterSize/2 - 1) compared to the direct
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* signal delay (FilterSize/2) to properly align.
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*/
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template<size_t FilterSize>
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struct PhaseShifterT {
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static_assert(FilterSize >= 16, "FilterSize needs to be at least 16");
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static_assert((FilterSize&(FilterSize-1)) == 0, "FilterSize needs to be power-of-two");
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alignas(16) std::array<float,FilterSize/2> mCoeffs{};
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/* Some notes on this filter construction.
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*
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* A wide-band phase-shift filter needs a delay to maintain linearity. A
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* dirac impulse in the center of a time-domain buffer represents a filter
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* passing all frequencies through as-is with a pure delay. Converting that
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* to the frequency domain, adjusting the phase of each frequency bin by
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* +90 degrees, then converting back to the time domain, results in a FIR
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* filter that applies a +90 degree wide-band phase-shift.
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*
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* A particularly notable aspect of the time-domain filter response is that
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* every other coefficient is 0. This allows doubling the effective size of
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* the filter, by storing only the non-0 coefficients and double-stepping
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* over the input to apply it.
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*
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* Additionally, the resulting filter is independent of the sample rate.
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* The same filter can be applied regardless of the device's sample rate
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* and achieve the same effect.
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*/
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PhaseShifterT()
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{
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using complex_d = std::complex<double>;
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constexpr size_t fft_size{FilterSize};
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constexpr size_t half_size{fft_size / 2};
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auto fftBuffer = std::make_unique<complex_d[]>(fft_size);
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std::fill_n(fftBuffer.get(), fft_size, complex_d{});
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fftBuffer[half_size] = 1.0;
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forward_fft(al::as_span(fftBuffer.get(), fft_size));
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for(size_t i{0};i < half_size+1;++i)
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fftBuffer[i] = complex_d{-fftBuffer[i].imag(), fftBuffer[i].real()};
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for(size_t i{half_size+1};i < fft_size;++i)
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fftBuffer[i] = std::conj(fftBuffer[fft_size - i]);
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inverse_fft(al::as_span(fftBuffer.get(), fft_size));
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auto fftiter = fftBuffer.get() + half_size + (FilterSize/2 - 1);
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for(float &coeff : mCoeffs)
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{
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coeff = static_cast<float>(fftiter->real() / double{fft_size});
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fftiter -= 2;
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}
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}
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void process(al::span<float> dst, const float *RESTRICT src) const;
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private:
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#if defined(HAVE_NEON)
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/* There doesn't seem to be NEON intrinsics to do this kind of stipple
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* shuffling, so there's two custom methods for it.
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*/
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static auto shuffle_2020(float32x4_t a, float32x4_t b)
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{
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float32x4_t ret{vmovq_n_f32(vgetq_lane_f32(a, 0))};
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ret = vsetq_lane_f32(vgetq_lane_f32(a, 2), ret, 1);
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ret = vsetq_lane_f32(vgetq_lane_f32(b, 0), ret, 2);
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ret = vsetq_lane_f32(vgetq_lane_f32(b, 2), ret, 3);
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return ret;
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}
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static auto shuffle_3131(float32x4_t a, float32x4_t b)
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{
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float32x4_t ret{vmovq_n_f32(vgetq_lane_f32(a, 1))};
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ret = vsetq_lane_f32(vgetq_lane_f32(a, 3), ret, 1);
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ret = vsetq_lane_f32(vgetq_lane_f32(b, 1), ret, 2);
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ret = vsetq_lane_f32(vgetq_lane_f32(b, 3), ret, 3);
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return ret;
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}
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static auto unpacklo(float32x4_t a, float32x4_t b)
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{
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float32x2x2_t result{vzip_f32(vget_low_f32(a), vget_low_f32(b))};
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return vcombine_f32(result.val[0], result.val[1]);
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}
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static auto unpackhi(float32x4_t a, float32x4_t b)
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{
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float32x2x2_t result{vzip_f32(vget_high_f32(a), vget_high_f32(b))};
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return vcombine_f32(result.val[0], result.val[1]);
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}
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static auto load4(float32_t a, float32_t b, float32_t c, float32_t d)
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{
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float32x4_t ret{vmovq_n_f32(a)};
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ret = vsetq_lane_f32(b, ret, 1);
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ret = vsetq_lane_f32(c, ret, 2);
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ret = vsetq_lane_f32(d, ret, 3);
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return ret;
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}
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#endif
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};
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template<size_t S>
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inline void PhaseShifterT<S>::process(al::span<float> dst, const float *RESTRICT src) const
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{
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#ifdef HAVE_SSE_INTRINSICS
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if(size_t todo{dst.size()>>1})
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{
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auto *out = reinterpret_cast<__m64*>(dst.data());
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do {
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__m128 r04{_mm_setzero_ps()};
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__m128 r14{_mm_setzero_ps()};
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for(size_t j{0};j < mCoeffs.size();j+=4)
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{
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const __m128 coeffs{_mm_load_ps(&mCoeffs[j])};
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const __m128 s0{_mm_loadu_ps(&src[j*2])};
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const __m128 s1{_mm_loadu_ps(&src[j*2 + 4])};
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__m128 s{_mm_shuffle_ps(s0, s1, _MM_SHUFFLE(2, 0, 2, 0))};
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r04 = _mm_add_ps(r04, _mm_mul_ps(s, coeffs));
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s = _mm_shuffle_ps(s0, s1, _MM_SHUFFLE(3, 1, 3, 1));
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r14 = _mm_add_ps(r14, _mm_mul_ps(s, coeffs));
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}
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src += 2;
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__m128 r4{_mm_add_ps(_mm_unpackhi_ps(r04, r14), _mm_unpacklo_ps(r04, r14))};
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r4 = _mm_add_ps(r4, _mm_movehl_ps(r4, r4));
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_mm_storel_pi(out, r4);
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++out;
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} while(--todo);
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}
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if((dst.size()&1))
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{
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__m128 r4{_mm_setzero_ps()};
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for(size_t j{0};j < mCoeffs.size();j+=4)
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{
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const __m128 coeffs{_mm_load_ps(&mCoeffs[j])};
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const __m128 s{_mm_setr_ps(src[j*2], src[j*2 + 2], src[j*2 + 4], src[j*2 + 6])};
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r4 = _mm_add_ps(r4, _mm_mul_ps(s, coeffs));
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}
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r4 = _mm_add_ps(r4, _mm_shuffle_ps(r4, r4, _MM_SHUFFLE(0, 1, 2, 3)));
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r4 = _mm_add_ps(r4, _mm_movehl_ps(r4, r4));
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dst.back() = _mm_cvtss_f32(r4);
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}
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#elif defined(HAVE_NEON)
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size_t pos{0};
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if(size_t todo{dst.size()>>1})
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{
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do {
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float32x4_t r04{vdupq_n_f32(0.0f)};
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float32x4_t r14{vdupq_n_f32(0.0f)};
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for(size_t j{0};j < mCoeffs.size();j+=4)
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{
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const float32x4_t coeffs{vld1q_f32(&mCoeffs[j])};
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const float32x4_t s0{vld1q_f32(&src[j*2])};
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const float32x4_t s1{vld1q_f32(&src[j*2 + 4])};
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r04 = vmlaq_f32(r04, shuffle_2020(s0, s1), coeffs);
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r14 = vmlaq_f32(r14, shuffle_3131(s0, s1), coeffs);
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}
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src += 2;
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float32x4_t r4{vaddq_f32(unpackhi(r04, r14), unpacklo(r04, r14))};
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float32x2_t r2{vadd_f32(vget_low_f32(r4), vget_high_f32(r4))};
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vst1_f32(&dst[pos], r2);
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pos += 2;
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} while(--todo);
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}
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if((dst.size()&1))
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{
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float32x4_t r4{vdupq_n_f32(0.0f)};
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for(size_t j{0};j < mCoeffs.size();j+=4)
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{
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const float32x4_t coeffs{vld1q_f32(&mCoeffs[j])};
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const float32x4_t s{load4(src[j*2], src[j*2 + 2], src[j*2 + 4], src[j*2 + 6])};
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r4 = vmlaq_f32(r4, s, coeffs);
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}
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r4 = vaddq_f32(r4, vrev64q_f32(r4));
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dst[pos] = vget_lane_f32(vadd_f32(vget_low_f32(r4), vget_high_f32(r4)), 0);
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}
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#else
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for(float &output : dst)
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{
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float ret{0.0f};
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for(size_t j{0};j < mCoeffs.size();++j)
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ret += src[j*2] * mCoeffs[j];
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output = ret;
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++src;
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}
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#endif
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}
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#endif /* PHASE_SHIFTER_H */
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