mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-09-05 07:17:45 -04:00
279 lines
7.3 KiB
C
279 lines
7.3 KiB
C
// This is part of Pico Library
|
|
|
|
// (c) Copyright 2004 Dave, All rights reserved.
|
|
// (c) Copyright 2007 notaz, All rights reserved.
|
|
// Free for non-commercial use.
|
|
|
|
// For commercial use, separate licencing terms must be obtained.
|
|
|
|
|
|
#include "../PicoInt.h"
|
|
#include "../sound/sound.h"
|
|
|
|
|
|
extern unsigned char formatted_bram[4*0x10];
|
|
|
|
|
|
int PicoInitMCD(void)
|
|
{
|
|
SekInitS68k();
|
|
Init_CD_Driver();
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
void PicoExitMCD(void)
|
|
{
|
|
End_CD_Driver();
|
|
}
|
|
|
|
int PicoResetMCD(int hard)
|
|
{
|
|
memset(Pico_mcd->prg_ram, 0, sizeof(Pico_mcd->prg_ram));
|
|
memset(Pico_mcd->word_ram2M, 0, sizeof(Pico_mcd->word_ram2M));
|
|
memset(Pico_mcd->pcm_ram, 0, sizeof(Pico_mcd->pcm_ram));
|
|
if (hard) {
|
|
int fmt_size = sizeof(formatted_bram);
|
|
memset(Pico_mcd->bram, 0, sizeof(Pico_mcd->bram));
|
|
memcpy(Pico_mcd->bram + sizeof(Pico_mcd->bram) - fmt_size, formatted_bram, fmt_size);
|
|
}
|
|
memset(Pico_mcd->s68k_regs, 0, sizeof(Pico_mcd->s68k_regs));
|
|
memset(&Pico_mcd->pcm, 0, sizeof(Pico_mcd->pcm));
|
|
|
|
*(unsigned int *)(Pico_mcd->bios + 0x70) = 0xffffffff; // reset hint vector (simplest way to implement reg6)
|
|
Pico_mcd->m.state_flags |= 2; // s68k reset pending
|
|
Pico_mcd->s68k_regs[3] = 1; // 2M word RAM mode with m68k access after reset
|
|
Pico_mcd->m.counter75hz = 0;
|
|
|
|
LC89510_Reset();
|
|
Reset_CD();
|
|
gfx_cd_reset();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static __inline void SekRun(int cyc)
|
|
{
|
|
int cyc_do;
|
|
SekCycleAim+=cyc;
|
|
if((cyc_do=SekCycleAim-SekCycleCnt) < 0) return;
|
|
#if defined(EMU_C68K)
|
|
PicoCpu.cycles=cyc_do;
|
|
CycloneRun(&PicoCpu);
|
|
SekCycleCnt+=cyc_do-PicoCpu.cycles;
|
|
#elif defined(EMU_M68K)
|
|
m68k_set_context(&PicoM68kCPU);
|
|
SekCycleCnt+=m68k_execute(cyc_do);
|
|
#endif
|
|
}
|
|
|
|
static __inline void SekRunS68k(int cyc)
|
|
{
|
|
int cyc_do;
|
|
SekCycleAimS68k+=cyc;
|
|
if((cyc_do=SekCycleAimS68k-SekCycleCntS68k) < 0) return;
|
|
#if defined(EMU_C68K)
|
|
PicoCpuS68k.cycles=cyc_do;
|
|
CycloneRun(&PicoCpuS68k);
|
|
SekCycleCntS68k+=cyc_do-PicoCpuS68k.cycles;
|
|
#elif defined(EMU_M68K)
|
|
m68k_set_context(&PicoS68kCPU);
|
|
SekCycleCntS68k+=m68k_execute(cyc_do);
|
|
#endif
|
|
}
|
|
|
|
static __inline void check_cd_dma(void)
|
|
{
|
|
int ddx;
|
|
|
|
if (!(Pico_mcd->scd.Status_CDC & 0x08)) return;
|
|
|
|
ddx = Pico_mcd->s68k_regs[4] & 7;
|
|
if (ddx < 2) return; // invalid
|
|
if (ddx < 4) {
|
|
Pico_mcd->s68k_regs[4] |= 0x40; // Data set ready in host port
|
|
return;
|
|
}
|
|
if (ddx == 6) return; // invalid
|
|
|
|
Update_CDC_TRansfer(ddx); // now go and do the actual transfer
|
|
}
|
|
|
|
static __inline void update_chips(void)
|
|
{
|
|
int counter_timer, int3_set;
|
|
int counter75hz_lim = Pico.m.pal ? 2080 : 2096;
|
|
|
|
// 75Hz CDC update
|
|
if ((Pico_mcd->m.counter75hz+=10) >= counter75hz_lim) {
|
|
Pico_mcd->m.counter75hz -= counter75hz_lim;
|
|
Check_CD_Command();
|
|
}
|
|
|
|
// update timers
|
|
counter_timer = Pico.m.pal ? 0x21630 : 0x2121c; // 136752 : 135708;
|
|
Pico_mcd->m.timer_stopwatch += counter_timer;
|
|
if ((int3_set = Pico_mcd->s68k_regs[0x31])) {
|
|
Pico_mcd->m.timer_int3 -= counter_timer;
|
|
if (Pico_mcd->m.timer_int3 < 0) {
|
|
if (Pico_mcd->s68k_regs[0x33] & (1<<3)) {
|
|
dprintf("s68k: timer irq 3");
|
|
SekInterruptS68k(3);
|
|
Pico_mcd->m.timer_int3 += int3_set << 16;
|
|
}
|
|
// is this really what happens if irq3 is masked out?
|
|
Pico_mcd->m.timer_int3 &= 0xffffff;
|
|
}
|
|
}
|
|
|
|
// update gfx chip
|
|
if (Pico_mcd->rot_comp.Reg_58 & 0x8000)
|
|
gfx_cd_update();
|
|
}
|
|
|
|
|
|
static int PicoFrameHintsMCD(void)
|
|
{
|
|
struct PicoVideo *pv=&Pico.video;
|
|
int total_z80=0,lines,y,lines_vis = 224,z80CycleAim = 0,line_sample;
|
|
const int cycles_68k=488,cycles_z80=228,cycles_s68k=795; // both PAL and NTSC compile to same values
|
|
int skip=PicoSkipFrame || (PicoOpt&0x10);
|
|
int hint; // Hint counter
|
|
|
|
if(Pico.m.pal) { //
|
|
//cycles_68k = (int) ((double) OSC_PAL / 7 / 50 / 312 + 0.4); // should compile to a constant (488)
|
|
//cycles_z80 = (int) ((double) OSC_PAL / 15 / 50 / 312 + 0.4); // 228
|
|
lines = 312; // Steve Snake says there are 313 lines, but this seems to also work well
|
|
line_sample = 68;
|
|
if(pv->reg[1]&8) lines_vis = 240;
|
|
} else {
|
|
//cycles_68k = (int) ((double) OSC_NTSC / 7 / 60 / 262 + 0.4); // 488
|
|
//cycles_z80 = (int) ((double) OSC_NTSC / 15 / 60 / 262 + 0.4); // 228
|
|
lines = 262;
|
|
line_sample = 93;
|
|
}
|
|
|
|
SekCyclesReset();
|
|
SekCyclesResetS68k();
|
|
//z80ExtraCycles = 0;
|
|
|
|
if(PicoOpt&4)
|
|
z80CycleAim = 0;
|
|
// z80_resetCycles();
|
|
|
|
pv->status&=~0x88; // clear V-Int, come out of vblank
|
|
|
|
hint=pv->reg[10]; // Load H-Int counter
|
|
//dprintf("-hint: %i", hint);
|
|
|
|
for (y=0;y<lines;y++)
|
|
{
|
|
Pico.m.scanline=(short)y;
|
|
|
|
// pad delay (for 6 button pads)
|
|
if(PicoOpt&0x20) {
|
|
if(Pico.m.padDelay[0]++ > 25) Pico.m.padTHPhase[0]=0;
|
|
if(Pico.m.padDelay[1]++ > 25) Pico.m.padTHPhase[1]=0;
|
|
}
|
|
|
|
check_cd_dma();
|
|
|
|
// H-Interrupts:
|
|
if(y <= lines_vis && --hint < 0) // y <= lines_vis: Comix Zone, Golden Axe
|
|
{
|
|
//dprintf("rhint:old @ %06x", SekPc);
|
|
hint=pv->reg[10]; // Reload H-Int counter
|
|
pv->pending_ints|=0x10;
|
|
if (pv->reg[0]&0x10) SekInterrupt(4);
|
|
//dprintf("rhint: %i @ %06x [%i|%i]", hint, SekPc, y, SekCycleCnt);
|
|
//dprintf("hint_routine: %x", (*(unsigned short*)(Pico.ram+0x0B84)<<16)|*(unsigned short*)(Pico.ram+0x0B86));
|
|
}
|
|
|
|
// V-Interrupt:
|
|
if (y == lines_vis)
|
|
{
|
|
//dprintf("vint: @ %06x [%i|%i]", SekPc, y, SekCycleCnt);
|
|
pv->status|=0x88; // V-Int happened, go into vblank
|
|
SekRun(128); SekCycleAim-=128; // there must be a gap between H and V ints, also after vblank bit set (Mazin Saga, Bram Stoker's Dracula)
|
|
/*if(Pico.m.z80Run && (PicoOpt&4)) {
|
|
z80CycleAim+=cycles_z80/2;
|
|
total_z80+=z80_run(z80CycleAim-total_z80);
|
|
z80CycleAim-=cycles_z80/2;
|
|
}*/
|
|
pv->pending_ints|=0x20;
|
|
if(pv->reg[1]&0x20) SekInterrupt(6);
|
|
if(Pico.m.z80Run && (PicoOpt&4)) // ?
|
|
z80_int();
|
|
//dprintf("zint: [%i|%i] zPC=%04x", Pico.m.scanline, SekCyclesDone(), mz80GetRegisterValue(NULL, 0));
|
|
}
|
|
|
|
// decide if we draw this line
|
|
#if CAN_HANDLE_240_LINES
|
|
if(!skip && ((!(pv->reg[1]&8) && y<224) || ((pv->reg[1]&8) && y<240)) )
|
|
#else
|
|
if(!skip && y<224)
|
|
#endif
|
|
PicoLine(y);
|
|
|
|
if(PicoOpt&1)
|
|
sound_timers_and_dac(y);
|
|
|
|
// get samples from sound chips
|
|
if (y == 224 && PsndOut) {
|
|
int len = sound_render(0, PsndLen);
|
|
if (PicoWriteSound) PicoWriteSound(len);
|
|
// clear sound buffer
|
|
sound_clear();
|
|
}
|
|
|
|
// Run scanline:
|
|
//dprintf("m68k starting exec @ %06x", SekPc);
|
|
if(Pico.m.dma_bytes) SekCycleCnt+=CheckDMA();
|
|
SekRun(cycles_68k);
|
|
if ((Pico_mcd->m.busreq&3) == 1) { // no busreq/no reset
|
|
#if 0
|
|
int i;
|
|
FILE *f = fopen("prg_ram.bin", "wb");
|
|
for (i = 0; i < 0x80000; i+=2)
|
|
{
|
|
int tmp = Pico_mcd->prg_ram[i];
|
|
Pico_mcd->prg_ram[i] = Pico_mcd->prg_ram[i+1];
|
|
Pico_mcd->prg_ram[i+1] = tmp;
|
|
}
|
|
fwrite(Pico_mcd->prg_ram, 1, 0x80000, f);
|
|
fclose(f);
|
|
exit(1);
|
|
#endif
|
|
//dprintf("s68k starting exec @ %06x", SekPcS68k);
|
|
SekRunS68k(cycles_s68k);
|
|
}
|
|
|
|
if((PicoOpt&4) && Pico.m.z80Run) {
|
|
Pico.m.z80Run|=2;
|
|
z80CycleAim+=cycles_z80;
|
|
total_z80+=z80_run(z80CycleAim-total_z80);
|
|
}
|
|
|
|
update_chips();
|
|
}
|
|
|
|
// draw a frame just after vblank in alternative render mode
|
|
if(!PicoSkipFrame && (PicoOpt&0x10))
|
|
PicoFrameFull();
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int PicoFrameMCD(void)
|
|
{
|
|
if(!(PicoOpt&0x10))
|
|
PicoFrameStart();
|
|
|
|
PicoFrameHintsMCD();
|
|
|
|
return 0;
|
|
}
|
|
|
|
|