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GUS: Refactor the buffer/mixer code and fix the MAX mixer's GF1 input

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This commit is contained in:
Alexander Babikov
2025-09-11 16:43:15 +05:00
parent 14cf9ee80b
commit 1340b031ee
1 changed files with 71 additions and 46 deletions
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117
src/sound/snd_gus.c
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@@ -1277,6 +1277,58 @@ gus_poll_wave(void *priv)
gus_update_int_status(gus);
}
void
gus_ics2101_filter(void *priv, int channel, double *out_l, double *out_r)
{
ics2101_t *ics2101 = (ics2101_t *) priv;
double temp_l = 0.0;
double temp_r = 0.0;
double master_l = 0.0;
double master_r = 0.0;
uint8_t ctrl_l = ics2101->channels[channel].ctrl[0];
uint8_t ctrl_r = ics2101->channels[channel].ctrl[1];
if (!(ctrl_l & 0xC)) { /* Normal mode */
if (ctrl_l & 1)
temp_l += *out_l * ics2101->channels[channel].level[0];
if (ctrl_l & 2)
temp_r += *out_l * ics2101->channels[channel].level[0];
if (ctrl_r & 1)
temp_l += *out_r * ics2101->channels[channel].level[1];
if (ctrl_r & 2)
temp_r += *out_r * ics2101->channels[channel].level[1];
} else { /* Stereo or Balance/Pan mode */
if (ctrl_l & 2) { /* Mono/Pan */
temp_l = (*out_l + *out_r) * 0.5 * ics2101->channels[channel].level[(ctrl_l & 1)];
temp_r = (*out_r + *out_l) * 0.5 * ics2101->channels[channel].level[!(ctrl_l & 1)];
} else { /* Stereo/Balance */
temp_l = ((ctrl_l & 1) ? *out_l : *out_r) * ics2101->channels[channel].level[(ctrl_l & 1)];
temp_r = ((ctrl_l & 1) ? *out_r : *out_l) * ics2101->channels[channel].level[!(ctrl_l & 1)];
}
}
/* Master */
ctrl_l = ics2101->channels[GUS_ICS2101_MASTER].ctrl[0];
ctrl_r = ics2101->channels[GUS_ICS2101_MASTER].ctrl[1];
if (!(ctrl_l & 0xC)) { /* Normal mode */
if (ctrl_l & 1)
master_l += temp_l * ics2101->channels[GUS_ICS2101_MASTER].level[0];
if (ctrl_l & 2)
master_r += temp_l * ics2101->channels[GUS_ICS2101_MASTER].level[0];
if (ctrl_r & 1)
master_l += temp_r * ics2101->channels[GUS_ICS2101_MASTER].level[1];
if (ctrl_r & 2)
master_r += temp_r * ics2101->channels[GUS_ICS2101_MASTER].level[1];
} else { /* Stereo or Balance mode - no mono/pan for master */
master_l = ((ctrl_l & 1) ? temp_l : temp_r) * ics2101->channels[GUS_ICS2101_MASTER].level[(ctrl_l & 1)];
master_r = ((ctrl_l & 1) ? temp_r : temp_l) * ics2101->channels[GUS_ICS2101_MASTER].level[!(ctrl_l & 1)];
}
*out_l = master_l;
*out_r = master_r;
}
static void
gus_get_buffer(int32_t *buffer, int len, void *priv)
{
@@ -1286,54 +1338,27 @@ gus_get_buffer(int32_t *buffer, int len, void *priv)
ad1848_update(&gus->ad1848);
gus_update(gus);
if (gus->type == GUS_CLASSIC_37)
for (int c = 0; c < len * 2; c += 2) {
double temp_l = 0.0;
double temp_r = 0.0;
/* GF1 out */
uint8_t ctrl_l = gus->ics2101.channels[GUS_ICS2101_GF1_OUT].ctrl[0];
uint8_t ctrl_r = gus->ics2101.channels[GUS_ICS2101_GF1_OUT].ctrl[1];
if (!(ctrl_l & 0xC)) { /* Normal mode */
if (ctrl_l & 1)
temp_l += (double) gus->buffer[0][c >> 1] * gus->ics2101.channels[GUS_ICS2101_GF1_OUT].level[0];
if (ctrl_l & 2)
temp_r += (double) gus->buffer[0][c >> 1] * gus->ics2101.channels[GUS_ICS2101_GF1_OUT].level[0];
if (ctrl_r & 1)
temp_l += (double) gus->buffer[1][c >> 1] * gus->ics2101.channels[GUS_ICS2101_GF1_OUT].level[1];
if (ctrl_r & 2)
temp_r += (double) gus->buffer[1][c >> 1] * gus->ics2101.channels[GUS_ICS2101_GF1_OUT].level[1];
} else { /* Stereo or Balance/Pan mode */
if (ctrl_l & 2) { /* Mono/Pan */
temp_l += ((double) gus->buffer[0][c >> 1] + (double) gus->buffer[1][c >> 1]) * 0.5 * gus->ics2101.channels[GUS_ICS2101_GF1_OUT].level[(ctrl_l & 1)];
temp_r += ((double) gus->buffer[0][c >> 1] + (double) gus->buffer[1][c >> 1]) * 0.5 * gus->ics2101.channels[GUS_ICS2101_GF1_OUT].level[!(ctrl_l & 1)];
} else { /* Stereo/Balance */
temp_l += (double) gus->buffer[(ctrl_l & 1)][c >> 1] * gus->ics2101.channels[GUS_ICS2101_GF1_OUT].level[(ctrl_l & 1)];
temp_r += (double) gus->buffer[!(ctrl_l & 1)][c >> 1] * gus->ics2101.channels[GUS_ICS2101_GF1_OUT].level[!(ctrl_l & 1)];
for (int c = 0; c < len * 2; c += 2) {
double temp_l = 0.0;
double temp_r = 0.0;
if ((gus->type == GUS_CLASSIC_37) || (gus->type == GUS_MAX)) {
temp_l = (double) gus->buffer[0][c >> 1];
temp_r = (double) gus->buffer[1][c >> 1];
if (gus->type == GUS_MAX) {
if (gus->max_ctrl) {
buffer[c] += (int32_t) (gus->ad1848.buffer[c] / 2);
buffer[c + 1] += (int32_t) (gus->ad1848.buffer[c + 1] / 2);
}
}
/* Master */
ctrl_l = gus->ics2101.channels[GUS_ICS2101_MASTER].ctrl[0];
ctrl_r = gus->ics2101.channels[GUS_ICS2101_MASTER].ctrl[1];
if (!(ctrl_l & 0xC)) { /* Normal mode */
if (ctrl_l & 1)
buffer[c] += (int32_t) (temp_l * gus->ics2101.channels[GUS_ICS2101_MASTER].level[0]);
if (ctrl_l & 2)
buffer[c + 1] += (int32_t) (temp_r * gus->ics2101.channels[GUS_ICS2101_MASTER].level[0]);
if (ctrl_r & 1)
buffer[c] += (int32_t) (temp_l * gus->ics2101.channels[GUS_ICS2101_MASTER].level[1]);
if (ctrl_r & 2)
buffer[c + 1] += (int32_t) (temp_r * gus->ics2101.channels[GUS_ICS2101_MASTER].level[1]);
} else { /* Stereo or Balance mode - no mono/pan for master */
buffer[c] += (int32_t) (((ctrl_l & 1) ? temp_l : temp_r) * gus->ics2101.channels[GUS_ICS2101_MASTER].level[(ctrl_l & 1)]);
buffer[c + 1] += (int32_t) (((ctrl_l & 1) ? temp_r : temp_l) * gus->ics2101.channels[GUS_ICS2101_MASTER].level[!(ctrl_l & 1)]);
}
}
else
for (int c = 0; c < len * 2; c++) {
if ((gus->type == GUS_MAX) && (gus->max_ctrl))
buffer[c] += (int32_t) (gus->ad1848.buffer[c] / 2);
buffer[c] += (int32_t) gus->buffer[c & 1][c >> 1];
ad1848_filter_channel(&gus->ad1848, AD1848_AUX1, &temp_l, &temp_r);
} else
gus_ics2101_filter(&gus->ics2101, GUS_ICS2101_GF1_OUT, &temp_l, &temp_r);
buffer[c] += (int32_t) temp_l;
buffer[c + 1] += (int32_t) temp_r;
} else {
buffer[c] += (int32_t) gus->buffer[0][c >> 1];
buffer[c + 1] += (int32_t) gus->buffer[1][c >> 1];
}
}
if ((gus->type == GUS_MAX) && (gus->max_ctrl))
gus->ad1848.pos = 0;