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Fix BL-synth master wave generation, that wasn't a square step... affects #713

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Lior Halphon
2025-07-12 01:17:47 +03:00
parent 08d58aa992
commit 8505f00cdf
2 changed files with 4 additions and 4 deletions
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6
Core/apu.c
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@@ -11,17 +11,17 @@ static int32_t band_limited_steps[GB_BAND_LIMITED_PHASES][GB_BAND_LIMITED_WIDTH]
static void __attribute__((constructor)) band_limited_init(void)
{
const unsigned master_size = GB_BAND_LIMITED_WIDTH * GB_BAND_LIMITED_PHASES;
const unsigned master_size = GB_BAND_LIMITED_WIDTH * GB_BAND_LIMITED_PHASES + 1;
double *master = malloc(master_size * sizeof(*master));
memset(master, 0, master_size * sizeof(*master));
const unsigned sine_size = 256 * GB_BAND_LIMITED_PHASES + 2;
const unsigned sine_size = (master_size - 1) * 2;
const unsigned max_harmonic = sine_size / 2 / GB_BAND_LIMITED_PHASES;
nounroll for (unsigned harmonic = 1; harmonic <= max_harmonic; harmonic += 2) {
double amplitude = 1.0 / harmonic / 2;
double to_angle = M_PI * 2 / sine_size * harmonic;
nounroll for (unsigned i = 0; i < master_size; i++) {
master[i] += sin(((signed)(i + 1) - (signed)master_size / 2) * to_angle) * amplitude;
master[i] += sin(((signed)(i + 1) - (signed)sine_size / 4) * to_angle) * amplitude;
}
}

2
Core/apu.h
View File

@@ -5,7 +5,7 @@
#include <stdio.h>
#include "defs.h"
#define GB_BAND_LIMITED_WIDTH 16
#define GB_BAND_LIMITED_WIDTH 32
#define GB_BAND_LIMITED_PHASES 512
#ifdef GB_INTERNAL