mirror of
https://github.com/RaySollium99/picodrive.git
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c6196c0f01
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@300 be3aeb3a-fb24-0410-a615-afba39da0efa
475 lines
12 KiB
C
475 lines
12 KiB
C
// This is part of Pico Library
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// (c) Copyright 2004 Dave, All rights reserved.
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// (c) Copyright 2006,2007 notaz, All rights reserved.
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// Free for non-commercial use.
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// For commercial use, separate licencing terms must be obtained.
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#include <string.h>
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#include "ym2612.h"
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#include "sn76496.h"
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#include "../PicoInt.h"
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#include "../cd/pcm.h"
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#include "mix.h"
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// master int buffer to mix to
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static int PsndBuffer[2*44100/50];
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// dac
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static unsigned short dac_info[312]; // pppppppp ppppllll, p - pos in buff, l - length to write for this sample
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// for Pico
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int PsndRate=0;
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int PsndLen=0; // number of mono samples, multiply by 2 for stereo
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int PsndLen_exc_add=0; // this is for non-integer sample counts per line, eg. 22050/60
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int PsndLen_exc_cnt=0;
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short *PsndOut=NULL; // PCM data buffer
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// sn76496
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extern int *sn76496_regs;
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static void dac_recalculate(void)
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{
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int i, dac_cnt, pos, len, lines = Pico.m.pal ? 312 : 262, mid = Pico.m.pal ? 68 : 93;
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if(PsndLen <= lines) {
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// shrinking algo
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dac_cnt = -PsndLen;
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len=1; pos=0;
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dac_info[225] = 1;
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for(i=226; i != 225; i++) {
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if (i >= lines) i = 0;
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len = 0;
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if(dac_cnt < 0) {
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len=1;
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pos++;
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dac_cnt += lines;
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}
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dac_cnt -= PsndLen;
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dac_info[i] = (pos<<4)|len;
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}
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} else {
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// stretching
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dac_cnt = PsndLen;
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pos=0;
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for(i = 225; i != 224; i++) {
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if (i >= lines) i = 0;
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len=0;
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while(dac_cnt >= 0) {
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dac_cnt -= lines;
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len++;
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}
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if (i == mid) // midpoint
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while(pos+len < PsndLen/2) {
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dac_cnt -= lines;
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len++;
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}
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dac_cnt += PsndLen;
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dac_info[i] = (pos<<4)|len;
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pos+=len;
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}
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// last sample
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for(len = 0, i = pos; i < PsndLen; i++) len++;
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if (PsndLen_exc_add) len++;
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dac_info[224] = (pos<<4)|len;
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}
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//for(i=len=0; i < lines; i++) {
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// printf("%03i : %03i : %i\n", i, dac_info[i]>>4, dac_info[i]&0xf);
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// len+=dac_info[i]&0xf;
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//}
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//printf("rate is %i, len %f\n", PsndRate, (double)PsndRate/(Pico.m.pal ? 50.0 : 60.0));
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//printf("len total: %i, last pos: %i\n", len, pos);
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//exit(8);
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}
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PICO_INTERNAL void PsndReset(void)
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{
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void *ym2612_regs;
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// also clear the internal registers+addr line
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ym2612_regs = YM2612GetRegs();
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memset(ym2612_regs, 0, 0x200+4);
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z80startCycle = z80stopCycle = 0;
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PsndRerate(0);
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}
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// to be called after changing sound rate or chips
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void PsndRerate(int preserve_state)
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{
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void *state = NULL;
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int target_fps = Pico.m.pal ? 50 : 60;
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// not all rates are supported in MCD mode due to mp3 decoder limitations
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if (PicoMCD & 1) {
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if (PsndRate != 11025 && PsndRate != 22050 && PsndRate != 44100) PsndRate = 22050;
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PicoOpt |= 8; // force stereo
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}
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if (preserve_state) {
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state = malloc(0x200);
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if (state == NULL) return;
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memcpy(state, YM2612GetRegs(), 0x200);
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if ((PicoMCD & 1) && Pico_mcd->m.audio_track)
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Pico_mcd->m.audio_offset = mp3_get_offset();
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}
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YM2612Init(Pico.m.pal ? OSC_PAL/7 : OSC_NTSC/7, PsndRate);
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if (preserve_state) {
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// feed it back it's own registers, just like after loading state
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memcpy(YM2612GetRegs(), state, 0x200);
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YM2612PicoStateLoad();
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if ((PicoMCD & 1) && Pico_mcd->m.audio_track)
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mp3_start_play(Pico_mcd->TOC.Tracks[Pico_mcd->m.audio_track].F, Pico_mcd->m.audio_offset);
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}
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if (preserve_state) memcpy(state, sn76496_regs, 28*4); // remember old state
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SN76496_init(Pico.m.pal ? OSC_PAL/15 : OSC_NTSC/15, PsndRate);
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if (preserve_state) memcpy(sn76496_regs, state, 28*4); // restore old state
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if (state)
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free(state);
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// calculate PsndLen
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PsndLen=PsndRate / target_fps;
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PsndLen_exc_add=((PsndRate - PsndLen*target_fps)<<16) / target_fps;
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PsndLen_exc_cnt=0;
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// recalculate dac info
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dac_recalculate();
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if (PicoMCD & 1)
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pcm_set_rate(PsndRate);
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// clear all buffers
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memset32(PsndBuffer, 0, sizeof(PsndBuffer)/4);
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if (PsndOut)
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PsndClear();
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}
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// This is called once per raster (aka line), but not necessarily for every line
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PICO_INTERNAL void Psnd_timers_and_dac(int raster)
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{
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int pos, len;
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int do_dac = PsndOut && (PicoOpt&1) && *ym2612_dacen;
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// int do_pcm = PsndOut && (PicoMCD&1) && (PicoOpt&0x400);
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// Our raster lasts 63.61323/64.102564 microseconds (NTSC/PAL)
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YM2612PicoTick(1);
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if (!do_dac /*&& !do_pcm*/) return;
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pos=dac_info[raster], len=pos&0xf;
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if (!len) return;
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pos>>=4;
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if (do_dac) {
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short *d = PsndOut + pos*2;
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int dout = *ym2612_dacout;
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if(PicoOpt&8) {
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// some manual loop unrolling here :)
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d[0] = dout;
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if (len > 1) {
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d[2] = dout;
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if (len > 2)
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d[4] = dout;
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}
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} else {
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short *d = PsndOut + pos;
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d[0] = dout;
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if (len > 1) {
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d[1] = dout;
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if (len > 2)
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d[2] = dout;
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}
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}
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}
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#if 0
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if (do_pcm) {
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int *d = PsndBuffer;
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d += (PicoOpt&8) ? pos*2 : pos;
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pcm_update(d, len, 1);
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}
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#endif
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}
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PICO_INTERNAL void PsndClear(void)
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{
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int len = PsndLen;
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if (PsndLen_exc_add) len++;
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if (PicoOpt & 8)
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memset32((int *) PsndOut, 0, len); // assume PsndOut to be aligned
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else {
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short *out = PsndOut;
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if ((int)out & 2) { *out++ = 0; len--; }
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memset32((int *) out, 0, len/2);
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if (len & 1) out[len-1] = 0;
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}
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}
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PICO_INTERNAL int PsndRender(int offset, int length)
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{
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int buf32_updated = 0;
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int *buf32 = PsndBuffer+offset;
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int stereo = (PicoOpt & 8) >> 3;
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// emulating CD && PCM option enabled && PCM chip on && have enabled channels
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int do_pcm = (PicoMCD&1) && (PicoOpt&0x400) && (Pico_mcd->pcm.control & 0x80) && Pico_mcd->pcm.enabled;
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offset <<= stereo;
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if (offset == 0) { // should happen once per frame
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// compensate for float part of PsndLen
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PsndLen_exc_cnt += PsndLen_exc_add;
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if (PsndLen_exc_cnt >= 0x10000) {
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PsndLen_exc_cnt -= 0x10000;
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length++;
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}
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}
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// PSG
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if (PicoOpt & 2)
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SN76496Update(PsndOut+offset, length, stereo);
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// Add in the stereo FM buffer
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if (PicoOpt & 1) {
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buf32_updated = YM2612UpdateOne(buf32, length, stereo, 1);
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} else
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memset32(buf32, 0, length<<stereo);
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//printf("active_chs: %02x\n", buf32_updated);
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// CD: PCM sound
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if (do_pcm) {
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pcm_update(buf32, length, stereo);
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//buf32_updated = 1;
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}
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// CD: CDDA audio
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// CD mode, cdda enabled, not data track, CDC is reading
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if ((PicoMCD & 1) && (PicoOpt & 0x800) && !(Pico_mcd->s68k_regs[0x36] & 1) && (Pico_mcd->scd.Status_CDC & 1))
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mp3_update(buf32, length, stereo);
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// convert + limit to normal 16bit output
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if (stereo)
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mix_32_to_16l_stereo(PsndOut+offset, buf32, length);
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else mix_32_to_16_mono (PsndOut+offset, buf32, length);
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return length;
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}
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#if defined(_USE_MZ80)
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// memhandlers for mz80 core
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unsigned char mz80_read(UINT32 a, struct MemoryReadByte *w) { return z80_read(a); }
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void mz80_write(UINT32 a, UINT8 d, struct MemoryWriteByte *w) { z80_write(d, a); }
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// structures for mz80 core
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static struct MemoryReadByte mz80_mem_read[]=
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{
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{0x0000,0xffff,mz80_read},
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{(UINT32) -1,(UINT32) -1,NULL}
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};
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static struct MemoryWriteByte mz80_mem_write[]=
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{
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{0x0000,0xffff,mz80_write},
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{(UINT32) -1,(UINT32) -1,NULL}
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};
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static struct z80PortRead mz80_io_read[] ={
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{(UINT16) -1,(UINT16) -1,NULL}
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};
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static struct z80PortWrite mz80_io_write[]={
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{(UINT16) -1,(UINT16) -1,NULL}
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};
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int mz80_run(int cycles)
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{
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int ticks_pre = mz80GetElapsedTicks(0);
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mz80exec(cycles);
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return mz80GetElapsedTicks(0) - ticks_pre;
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}
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#elif defined(_USE_DRZ80)
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struct DrZ80 drZ80;
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static unsigned int DrZ80_rebasePC(unsigned short a)
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{
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drZ80.Z80PC_BASE = (unsigned int) Pico.zram;
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return drZ80.Z80PC_BASE + a;
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}
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static unsigned int DrZ80_rebaseSP(unsigned short a)
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{
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drZ80.Z80SP_BASE = (unsigned int) Pico.zram;
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return drZ80.Z80SP_BASE + a;
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}
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static void DrZ80_irq_callback()
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{
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drZ80.Z80_IRQ = 0; // lower irq when accepted
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}
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#endif
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#if defined(_USE_DRZ80) || defined(_USE_CZ80)
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static unsigned char z80_in(unsigned short p)
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{
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elprintf(EL_ANOMALY, "Z80 port %04x read", p);
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return 0xff;
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}
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static void z80_out(unsigned short p,unsigned char d)
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{
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elprintf(EL_ANOMALY, "Z80 port %04x write %02x", p, d);
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}
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#endif
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// z80 functionality wrappers
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PICO_INTERNAL void z80_init(void)
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{
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#if defined(_USE_MZ80)
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struct mz80context z80;
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// z80
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mz80init();
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// Modify the default context
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mz80GetContext(&z80);
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// point mz80 stuff
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z80.z80Base=Pico.zram;
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z80.z80MemRead=mz80_mem_read;
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z80.z80MemWrite=mz80_mem_write;
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z80.z80IoRead=mz80_io_read;
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z80.z80IoWrite=mz80_io_write;
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mz80SetContext(&z80);
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#elif defined(_USE_DRZ80)
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memset(&drZ80, 0, sizeof(struct DrZ80));
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drZ80.z80_rebasePC=DrZ80_rebasePC;
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drZ80.z80_rebaseSP=DrZ80_rebaseSP;
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drZ80.z80_read8 =z80_read;
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drZ80.z80_read16 =z80_read16;
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drZ80.z80_write8 =z80_write;
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drZ80.z80_write16 =z80_write16;
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drZ80.z80_in =z80_in;
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drZ80.z80_out =z80_out;
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drZ80.z80_irq_callback=DrZ80_irq_callback;
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#elif defined(_USE_CZ80)
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memset(&CZ80, 0, sizeof(CZ80));
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Cz80_Init(&CZ80);
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Cz80_Set_Fetch(&CZ80, 0x0000, 0x1fff, (UINT32)Pico.zram); // main RAM
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Cz80_Set_Fetch(&CZ80, 0x2000, 0x3fff, (UINT32)Pico.zram); // mirror
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Cz80_Set_ReadB(&CZ80, (UINT8 (*)(UINT32 address))z80_read); // unused (hacked in)
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Cz80_Set_WriteB(&CZ80, z80_write);
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Cz80_Set_INPort(&CZ80, z80_in);
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Cz80_Set_OUTPort(&CZ80, z80_out);
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#endif
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}
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PICO_INTERNAL void z80_reset(void)
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{
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#if defined(_USE_MZ80)
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mz80reset();
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#elif defined(_USE_DRZ80)
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memset(&drZ80, 0, 0x54);
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drZ80.Z80F = (1<<2); // set ZFlag
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drZ80.Z80F2 = (1<<2); // set ZFlag
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drZ80.Z80IX = 0xFFFF << 16;
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drZ80.Z80IY = 0xFFFF << 16;
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drZ80.Z80IM = 0; // 1?
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drZ80.Z80PC = drZ80.z80_rebasePC(0);
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drZ80.Z80SP = drZ80.z80_rebaseSP(0x2000); // 0xf000 ?
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#elif defined(_USE_CZ80)
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Cz80_Reset(&CZ80);
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Cz80_Set_Reg(&CZ80, CZ80_IX, 0xffff);
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Cz80_Set_Reg(&CZ80, CZ80_IY, 0xffff);
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Cz80_Set_Reg(&CZ80, CZ80_SP, 0x2000);
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#endif
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Pico.m.z80_fakeval = 0; // for faking when Z80 is disabled
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}
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PICO_INTERNAL void z80_pack(unsigned char *data)
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{
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#if defined(_USE_MZ80)
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struct mz80context mz80;
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*(int *)data = 0x00005A6D; // "mZ"
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mz80GetContext(&mz80);
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memcpy(data+4, &mz80.z80clockticks, sizeof(mz80)-5*4); // don't save base&memhandlers
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#elif defined(_USE_DRZ80)
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*(int *)data = 0x015A7244; // "DrZ" v1
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drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);
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drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);
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memcpy(data+4, &drZ80, 0x54);
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#elif defined(_USE_CZ80)
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*(int *)data = 0x00007a43; // "Cz"
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*(int *)(data+4) = Cz80_Get_Reg(&CZ80, CZ80_PC);
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memcpy(data+8, &CZ80, (INT32)&CZ80.BasePC - (INT32)&CZ80);
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#endif
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}
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PICO_INTERNAL void z80_unpack(unsigned char *data)
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{
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#if defined(_USE_MZ80)
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if (*(int *)data == 0x00005A6D) { // "mZ" save?
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struct mz80context mz80;
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mz80GetContext(&mz80);
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memcpy(&mz80.z80clockticks, data+4, sizeof(mz80)-5*4);
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mz80SetContext(&mz80);
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} else {
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z80_reset();
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z80_int();
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}
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#elif defined(_USE_DRZ80)
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if (*(int *)data == 0x015A7244) { // "DrZ" v1 save?
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memcpy(&drZ80, data+4, 0x54);
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// update bases
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drZ80.Z80PC = drZ80.z80_rebasePC(drZ80.Z80PC-drZ80.Z80PC_BASE);
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drZ80.Z80SP = drZ80.z80_rebaseSP(drZ80.Z80SP-drZ80.Z80SP_BASE);
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} else {
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z80_reset();
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drZ80.Z80IM = 1;
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z80_int(); // try to goto int handler, maybe we won't execute trash there?
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}
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#elif defined(_USE_CZ80)
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if (*(int *)data == 0x00007a43) { // "Cz" save?
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memcpy(&CZ80, data+8, (INT32)&CZ80.BasePC - (INT32)&CZ80);
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Cz80_Set_Reg(&CZ80, CZ80_PC, *(int *)(data+4));
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} else {
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z80_reset();
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z80_int();
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}
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#endif
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}
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PICO_INTERNAL void z80_exit(void)
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{
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#if defined(_USE_MZ80)
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mz80shutdown();
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#endif
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}
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#if 1 // defined(__DEBUG_PRINT) || defined(__GP2X__) || defined(__GIZ__)
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PICO_INTERNAL void z80_debug(char *dstr)
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{
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#if defined(_USE_DRZ80)
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sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", drZ80.Z80PC-drZ80.Z80PC_BASE, drZ80.Z80SP-drZ80.Z80SP_BASE);
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#elif defined(_USE_CZ80)
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sprintf(dstr, "Z80 state: PC: %04x SP: %04x\n", CZ80.PC - CZ80.BasePC, CZ80.SP.W);
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#endif
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}
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#endif
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