src/hardware/snd_pc98/sound/tms3631g.c

#include    "np2glue.h"
//#include      "compiler.h"
#include        "sound.h"
#include        "tms3631.h"


extern  TMS3631CFG      tms3631cfg;


void SOUNDCALL tms3631_getpcm(TMS3631 tms, SINT32 *pcm, UINT count) {

        UINT    i;

        if (tms->enable == 0) {
                return;
        }
        while(count--) {
                UINT ch = 0;
                SINT32 data = 0;
                do {                                                                    // centre
                        if ((tms->enable & (1 << ch)) && (tms->ch[ch].freq)) {
                                for (i=0; i<4; i++) {
                                        tms->ch[ch].count += tms->ch[ch].freq;
                                        data += (tms->ch[ch].count & 0x10000)?1:-1;
                                }
                        }
                } while(++ch < 2);
                pcm[0] += data * tms3631cfg.left;
                pcm[1] += data * tms3631cfg.right;
                do {                                                                    // left
                        if ((tms->enable & (1 << ch)) && (tms->ch[ch].freq)) {
                                for (i=0; i<4; i++) {
                                        tms->ch[ch].count += tms->ch[ch].freq;
                                        pcm[0] += tms3631cfg.feet[(tms->ch[ch].count >> 16) & 15];
                                }
                        }
                } while(++ch < 5);
                do {                                                                    // right
                        if ((tms->enable & (1 << ch)) && (tms->ch[ch].freq)) {
                                for (i=0; i<4; i++) {
                                        tms->ch[ch].count += tms->ch[ch].freq;
                                        pcm[1] += tms3631cfg.feet[(tms->ch[ch].count >> 16) & 15];
                                }
                        }
                } while(++ch < 8);
                pcm += 2;
        }
}