src/hardware/snd_pc98/sound/pcm86c.c

#include    "np2glue.h"
//#include      "compiler.h"
//#include      "cpucore.h"
//#include      "pccore.h"
//#include      "iocore.h"
#include        "sound.h"
#include        "fmboard.h"


// �T���v�����O���[�g��8�|������
const UINT pcm86rate8[] = {352800, 264600, 176400, 132300,
                                                        88200,  66150,  44010,  33075};

// 32,24,16,12, 8, 6, 4, 3 - �ŏ����{��: 96
//  3, 4, 6, 8,12,16,24,32

#if 0
static const UINT clk25_128[] = {
                                        0x00001bde, 0x00002527, 0x000037bb, 0x00004a4e,
                                        0x00006f75, 0x0000949c, 0x0000df5f, 0x00012938};
static const UINT clk20_128[] = {
                                        0x000016a4, 0x00001e30, 0x00002d48, 0x00003c60,
                                        0x00005a8f, 0x000078bf, 0x0000b57d, 0x0000f17d};
#endif

        PCM86CFG        pcm86cfg;


void pcm86gen_initialize(UINT rate) {

        pcm86cfg.rate = rate;
}

void pcm86gen_setvol(UINT vol) {

        pcm86cfg.vol = vol;
        pcm86gen_update();
}

void pcm86_reset(void) {

        ZeroMemory(&pcm86, sizeof(pcm86));
        pcm86.fifosize = 0x80;
        pcm86.dactrl = 0x32;
        pcm86.stepmask = (1 << 2) - 1;
        pcm86.stepbit = 2;
        pcm86.stepclock = (pccore.baseclock << 6);
        pcm86.stepclock /= 44100;
        pcm86.stepclock *= pccore.multiple;
        pcm86.rescue = (PCM86_RESCUE * 32) << 2;
}

void pcm86gen_update(void) {

        pcm86.volume = pcm86cfg.vol * pcm86.vol5;
        pcm86_setpcmrate(pcm86.fifo);
}

void pcm86_setpcmrate(REG8 val) {

        SINT32  rate;

        rate = pcm86rate8[val & 7];
        pcm86.stepclock = (pccore.baseclock << 6);
        pcm86.stepclock /= rate;
        pcm86.stepclock *= (pccore.multiple << 3);
        if (pcm86cfg.rate) {
                pcm86.div = (rate << (PCM86_DIVBIT - 3)) / pcm86cfg.rate;
                pcm86.div2 = (pcm86cfg.rate << (PCM86_DIVBIT + 3)) / rate;
        }
}

void pcm86_cb(NEVENTITEM item) {
    (void)item;//UNUSED
#if 0
        if (pcm86.reqirq) {
                sound_sync();
//              RECALC_NOWCLKP;
                if (pcm86.virbuf <= pcm86.fifosize) {
                        pcm86.reqirq = 0;
                        pcm86.irqflag = 1;
                        pic_setirq(fmtimer.irq);
                }
                else {
                        pcm86_setnextintr();
                }
        }
        (void)item;
#endif
}

void pcm86_setnextintr(void) {
#if 0
        SINT32  cnt;
        SINT32  clk;

        if (pcm86.fifo & 0x80) {
                cnt = pcm86.virbuf - pcm86.fifosize;
                if (cnt > 0) {
                        cnt += pcm86.stepmask;
                        cnt >>= pcm86.stepbit;
//                      cnt += 4;                                                               // ������Ɖ��؂�����
                        // ������ clk = pccore.realclock * cnt / 86pcm_rate
                        // clk = ((pccore.baseclock / 86pcm_rate) * cnt) * pccore.multiple
                        if (pccore.cpumode & CPUMODE_8MHZ) {
                                clk = clk20_128[pcm86.fifo & 7];
                        }
                        else {
                                clk = clk25_128[pcm86.fifo & 7];
                        }
                        // cnt�͍ő� 8000h �� 32bit�Ŏ��܂�悤�Ɂc
                        clk *= cnt;
                        clk >>= 7;
//                      clk++;                                          // roundup
                        clk *= pccore.multiple;
                        nevent_set(NEVENT_86PCM, clk, pcm86_cb, NEVENT_ABSOLUTE);
                }
        }
#endif
}

void SOUNDCALL pcm86gen_checkbuf(void) {
#if 0
        long    bufs;
        UINT32  past;

        past = CPU_CLOCK + CPU_BASECLOCK - CPU_REMCLOCK;
        past <<= 6;
        past -= pcm86.lastclock;
        if (past >= pcm86.stepclock) {
                past = past / pcm86.stepclock;
                pcm86.lastclock += (past * pcm86.stepclock);
                RECALC_NOWCLKWAIT(past);
        }

        bufs = pcm86.realbuf - pcm86.virbuf;
        if (bufs < 0) {                                                                 // ����������c
                bufs &= ~3;
                pcm86.virbuf += bufs;
                if (pcm86.virbuf <= pcm86.fifosize) {
                        pcm86.reqirq = 0;
                        pcm86.irqflag = 1;
                        pic_setirq(fmtimer.irq);
                }
                else {
                        pcm86_setnextintr();
                }
        }
        else {
                bufs -= PCM86_EXTBUF;
                if (bufs > 0) {
                        bufs &= ~3;
                        pcm86.realbuf -= bufs;
                        pcm86.readpos += bufs;
                }
        }
#endif
}


BOOL pcm86gen_intrq(void) {

        if (pcm86.irqflag) {
                return(TRUE);
        }
        if (pcm86.fifo & 0x20) {
                sound_sync();
                if ((pcm86.reqirq) && (pcm86.virbuf <= pcm86.fifosize)) {
                        pcm86.reqirq = 0;
                        pcm86.irqflag = 1;
                        return(TRUE);
                }
        }
        return(FALSE);
}