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swan: fix edge case in APU emulation

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Adrian Siekierka 2025-03-16 18:32:55 +01:00 committed by tildearrow
parent 17363d9a28
commit b4b0481b3f
1 changed files with 1 additions and 1 deletions
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2
src/engine/platform/sound/swan.c
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@ -136,7 +136,7 @@ void swan_sound_tick(swan_sound_t *snd, uint32_t cycles) {
snd->period_counter[ch] -= step;
// Update noise counter
if (ch == 3 && (snd->ch_ctrl & SND_CH4_NOISE) && (snd->noise_ctrl & SND_NOISE_ENABLE)) {
if (ch == 3 && (snd->noise_ctrl & SND_NOISE_ENABLE)) {
uint8_t lfsr_new = (1 ^ (snd->noise_lfsr >> 7) ^ (snd->noise_lfsr >> lfsr_tap_bits[snd->noise_ctrl & 7])) & 0x1;
snd->noise_lfsr = (snd->noise_lfsr << 1) | lfsr_new;
}