prosperon/source/engine/sound/mix.c

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#include "mix.h"
#include "stddef.h"
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#include "time.h"
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#include "sound.h"
#include "dsp.h"
#include <string.h>
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static struct bus bus[256];
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static int first = 0; /* First bus available */
static int first_on = -1;
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short mastermix[BUF_FRAMES*CHANNELS];
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void mixer_init() {
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for (int i = 0; i < 256; i++) {
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bus[i].next = i+1;
bus[i].on = 0;
bus[i].id = i;
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}
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bus[255].next = -1;
}
struct bus *first_free_bus(struct dsp_filter in) {
if (first == -1) return NULL;
struct bus *ret = bus[first];
first = ret->next;
ret->on = 1;
ret->in = in;
ret->next = first_on;
first_on = ret->id;
return ret;
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}
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void bus_free(struct bus *bus)
{
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bus->next = first;
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bus->on = 0;
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first = bus->id;
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}
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void bus_fill_buffers(short *master, int n) {
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int curbus = first_one
memset(master, 0, BUF_FRAMES*CHANNELS*sizeof(short));
while (bus[curbus].next != -1) {
dsp_run(bus[curbus].in, bus[curbus].buf, BUF_FRAMES);
for (int i = 0; i < BUF_FRAMES*CHANNELS; i++)
master[i] += bus[curbus].buf[i];
curbus = bus[curbus].next;
}
/*
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for (int i = 0; i < 256; i++) {
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if (bus[i].on != 1) continue;
dsp_run(bus[i].in, bus[i].buf, BUF_FRAMES);
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}
for (int j = 0; j < 256; j++) {
if (!bus[j].on) continue;
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for (int i = 0; i < BUF_FRAMES*CHANNELS; i++) {
master[i] += bus[j].buf[i];
}
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}
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*/
}