mirror of https://github.com/bsnes-emu/bsnes.git
51 lines
1.0 KiB
C++
51 lines
1.0 KiB
C++
#pragma once
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struct ResampleCubic : Resampler {
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ResampleCubic(DSP& dsp) : Resampler(dsp) {}
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inline auto setFrequency() -> void;
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inline auto clear() -> void;
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inline auto sample() -> void;
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private:
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double fraction;
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double step;
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};
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auto ResampleCubic::setFrequency() -> void {
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fraction = 0.0;
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step = dsp.settings.frequency / frequency;
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}
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auto ResampleCubic::clear() -> void {
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fraction = 0.0;
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}
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auto ResampleCubic::sample() -> void {
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while(fraction <= 1.0) {
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double channel[dsp.settings.channels];
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for(auto n : range(dsp.settings.channels)) {
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double a = dsp.buffer.read(n, -3);
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double b = dsp.buffer.read(n, -2);
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double c = dsp.buffer.read(n, -1);
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double d = dsp.buffer.read(n, -0);
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double mu = fraction;
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double A = d - c - a + b;
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double B = a - b - A;
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double C = c - a;
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double D = b;
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channel[n] = A * (mu * 3) + B * (mu * 2) + C * mu + D;
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}
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dsp.write(channel);
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fraction += step;
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}
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dsp.buffer.rdoffset++;
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fraction -= 1.0;
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}
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