mirror of
https://gitlab.com/ryandwyer/perfect-dark
synced 2026-06-10 12:54:51 -04:00
Ryan Dwyer
100 lines
2.2 KiB
C
100 lines
2.2 KiB
C
#include <os_internal.h>
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#include <ultraerror.h>
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#include "n_synthInternals.h"
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s32 _allocatePVoice(N_PVoice **pvoice, s16 priority);
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s32 n_alSynAllocVoice(N_ALVoice *voice, ALVoiceConfig *vc)
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{
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N_PVoice *pvoice = 0;
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ALParam *update;
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s32 stolen;
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voice->priority = vc->priority;
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voice->unityPitch = vc->unityPitch;
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voice->table = 0;
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voice->fxBus = vc->fxBus;
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voice->state = AL_STOPPED;
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voice->pvoice = 0;
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stolen = _allocatePVoice( &pvoice, vc->priority);
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if (pvoice) { /* if we were able to allocate a voice */
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if (stolen) {
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pvoice->offset = 552;
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pvoice->vvoice->pvoice = 0; /* zero stolen voice */
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pvoice->vvoice = voice;
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voice->pvoice = pvoice;
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/*
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* ramp down stolen voice
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*/
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update = __n_allocParam();
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if (update) {
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update->delta = n_syn->paramSamples;
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update->type = AL_FILTER_SET_VOLUME;
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update->data.i = 0;
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update->moredata.i = 368; /* pvoice->offset - 184 */
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n_alEnvmixerParam(voice->pvoice, AL_FILTER_ADD_UPDATE, update);
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} else {
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// empty
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}
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/*
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* stop stolen voice
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*/
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update = __n_allocParam();
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if (update) {
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update->delta = n_syn->paramSamples + pvoice->offset;
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update->type = AL_FILTER_STOP_VOICE;
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update->next = 0;
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n_alEnvmixerParam(voice->pvoice, AL_FILTER_ADD_UPDATE, update);
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} else {
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// empty
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}
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} else {
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pvoice->offset = 0;
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pvoice->vvoice = voice;
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voice->pvoice = pvoice;
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}
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}
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return (pvoice != 0);
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}
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s32 _allocatePVoice(N_PVoice **pvoice, s16 priority)
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{
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ALLink *dl;
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N_PVoice *pv;
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s32 stolen = 0;
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if ((dl = n_syn->pLameList.next) != 0) { /* check the lame list first */
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*pvoice = (N_PVoice *)dl;
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alUnlink(dl);
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alLink(dl, &n_syn->pAllocList);
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} else if ((dl = n_syn->pFreeList.next) != 0) { /* from the free list */
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*pvoice = (N_PVoice *) dl;
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alUnlink(dl);
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alLink(dl, &n_syn->pAllocList);
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} else { /* steal one */
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for (dl = n_syn->pAllocList.next; dl != 0; dl = dl->next) {
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pv = (N_PVoice *)dl;
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/*
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* if it is lower priority and not already stolen, keep it
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* as a candidate for stealing
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*/
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if ((pv->vvoice->priority <= priority) && (pv->offset == 0)) {
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*pvoice = pv;
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priority = pv->vvoice->priority;
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stolen = 1;
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}
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}
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}
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return stolen;
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}
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