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AdLib Gold: Correctly use separate pseudo-stereo X and Y for the two sources.

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OBattler
2025-09-23 17:55:46 +02:00
parent c2607f8671
commit 288b6454ee
2 changed files with 12 additions and 12 deletions
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18
src/include/86box/filters.h
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@@ -75,7 +75,7 @@ adgold_lowpass_iir(int c, int i, float NewSample)
/* fc=56Hz */
static inline float
adgold_pseudo_stereo_iir(float NewSample)
adgold_pseudo_stereo_iir(int i, float NewSample)
{
float ACoef[NCoef + 1] = {
0.00001409030866231767,
@@ -89,23 +89,23 @@ adgold_pseudo_stereo_iir(float NewSample)
0.98738361004063568000
};
static float y[NCoef + 1]; /* output samples */
static float x[NCoef + 1]; /* input samples */
static float y[2][NCoef + 1]; /* output samples */
static float x[2][NCoef + 1]; /* input samples */
int n;
/* shift the old samples */
for (n = NCoef; n > 0; n--) {
x[n] = x[n - 1];
y[n] = y[n - 1];
x[i][n] = x[i][n - 1];
y[i][n] = y[i][n - 1];
}
/* Calculate the new output */
x[0] = NewSample;
y[0] = ACoef[0] * x[0];
x[i][0] = NewSample;
y[i][0] = ACoef[0] * x[i][0];
for (n = 1; n <= NCoef; n++)
y[0] += ACoef[n] * x[n] - BCoef[n] * y[n];
y[i][0] += ACoef[n] * x[i][n] - BCoef[n] * y[i][n];
return y[0];
return y[i][0];
}
/* fc=3.2kHz - probably incorrect */

6
src/sound/snd_adlibgold.c
View File

@@ -82,7 +82,7 @@ typedef struct adgold_t {
int treble;
int bass;
int16_t opl_buffer[SOUNDBUFLEN * 2];
int16_t opl_buffer[MUSICBUFLEN * 2];
int16_t mma_buffer[2][SOUNDBUFLEN];
int pos;
@@ -829,7 +829,7 @@ adgold_get_buffer(int32_t *buffer, int len, void *priv)
/*Filter left channel, leave right channel unchanged*/
/*Filter cutoff is largely a guess*/
for (c = 0; c < len * 2; c += 2)
adgold_buffer[c] += adgold_pseudo_stereo_iir(adgold_buffer[c]);
adgold_buffer[c] += adgold_pseudo_stereo_iir(0, adgold_buffer[c]);
break;
case 0x18: /*Spatial stereo*/
/*Quite probably wrong, I only have the diagram in the TDA8425 datasheet
@@ -944,7 +944,7 @@ adgold_get_music_buffer(int32_t *buffer, int len, void *priv)
/*Filter left channel, leave right channel unchanged*/
/*Filter cutoff is largely a guess*/
for (c = 0; c < len * 2; c += 2)
adgold_buffer[c] += adgold_pseudo_stereo_iir(adgold_buffer[c]);
adgold_buffer[c] += adgold_pseudo_stereo_iir(1, adgold_buffer[c]);
break;
case 0x18: /*Spatial stereo*/
/*Quite probably wrong, I only have the diagram in the TDA8425 datasheet