mirror of
https://github.com/RetroPortingToolKit/psxrecomp
synced 2026-10-26 02:11:36 -04:00
Matthew Stanley
7ae052534a
Port the reusable Gaussian interpolation slice from PR #16 while keeping its reverb engine on a separate branch. Co-authored-by: Martin Penkava <mpenkava1337@gmail.com> Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
33 lines
955 B
C
33 lines
955 B
C
#include "spu_gauss.h"
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#include <assert.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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int main(void)
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{
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int16_t previous[3] = { 1000, 2000, 3000 };
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int16_t samples[28];
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memset(samples, 0, sizeof(samples));
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samples[0] = 4000;
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/* At the start of a block all three historical taps must come from the
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* previous block. These coefficients are table entries 255, 511, 256, 0. */
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assert(spu_gaussian_interpolate(previous, samples, 0, 0) == 1994);
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/* The same four values inside a block must produce the same result. */
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samples[0] = 1000;
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samples[1] = 2000;
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samples[2] = 3000;
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samples[3] = 4000;
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assert(spu_gaussian_interpolate(previous, samples, 3, 0) == 1994);
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memset(previous, 0, sizeof(previous));
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memset(samples, 0, sizeof(samples));
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assert(spu_gaussian_interpolate(previous, samples, 0, 0x800u) == 0);
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puts("SPU Gaussian interpolation tests passed");
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return 0;
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}
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