mirror of
https://github.com/RaySollium99/picodrive.git
synced 2025-09-05 15:27:46 -04:00
272 lines
7.1 KiB
C
272 lines
7.1 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 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 "../PicoInt.h"
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#include "../sound/sound.h"
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extern unsigned char formatted_bram[8*0x10];
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int PicoInitMCD(void)
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{
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SekInitS68k();
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Init_CD_Driver();
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return 0;
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}
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void PicoExitMCD(void)
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{
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End_CD_Driver();
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}
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int PicoResetMCD(int hard)
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{
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memset(Pico_mcd->prg_ram, 0, sizeof(Pico_mcd->prg_ram));
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memset(Pico_mcd->word_ram, 0, sizeof(Pico_mcd->word_ram));
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if (hard) {
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memset(Pico_mcd->bram, 0, sizeof(Pico_mcd->bram));
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memcpy(Pico_mcd->bram + sizeof(Pico_mcd->bram) - 8*0x10, formatted_bram, 8*0x10);
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}
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memset(Pico_mcd->s68k_regs, 0, sizeof(Pico_mcd->s68k_regs));
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*(unsigned int *)(Pico_mcd->bios + 0x70) = 0xffffffff; // reset hint vector (simplest way to implement reg6)
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Pico_mcd->m.state_flags |= 2; // s68k reset pending
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Pico_mcd->s68k_regs[3] = 1; // 2M word RAM mode with m68k access after reset
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Pico_mcd->m.counter75hz = 0;
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LC89510_Reset();
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Reset_CD();
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gfx_cd_reset();
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return 0;
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}
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static __inline void SekRun(int cyc)
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{
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int cyc_do;
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SekCycleAim+=cyc;
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if((cyc_do=SekCycleAim-SekCycleCnt) < 0) return;
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#if defined(EMU_C68K)
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PicoCpu.cycles=cyc_do;
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CycloneRun(&PicoCpu);
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SekCycleCnt+=cyc_do-PicoCpu.cycles;
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#elif defined(EMU_M68K)
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m68k_set_context(&PicoM68kCPU);
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SekCycleCnt+=m68k_execute(cyc_do);
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#endif
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}
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static __inline void SekRunS68k(int cyc)
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{
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int cyc_do;
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SekCycleAimS68k+=cyc;
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if((cyc_do=SekCycleAimS68k-SekCycleCntS68k) < 0) return;
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#if defined(EMU_C68K)
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PicoCpuS68k.cycles=cyc_do;
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CycloneRun(&PicoCpuS68k);
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SekCycleCntS68k+=cyc_do-PicoCpuS68k.cycles;
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#elif defined(EMU_M68K)
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m68k_set_context(&PicoS68kCPU);
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SekCycleCntS68k+=m68k_execute(cyc_do);
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#endif
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}
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static __inline void check_cd_dma(void)
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{
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int ddx;
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if (!(Pico_mcd->scd.Status_CDC & 0x08)) return;
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ddx = Pico_mcd->s68k_regs[4] & 7;
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if (ddx < 2) return; // invalid
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if (ddx < 4) {
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Pico_mcd->s68k_regs[4] |= 0x40; // Data set ready in host port
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return;
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}
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if (ddx == 6) return; // invalid
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Update_CDC_TRansfer(ddx); // now go and do the actual transfer
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}
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// to be called on 224 or line_sample scanlines only
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static __inline void getSamples(int y)
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{
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if(y == 224) {
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//dprintf("sta%i: %i [%i]", (emustatus & 2), emustatus, y);
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if(emustatus & 2)
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sound_render(PsndLen/2, PsndLen-PsndLen/2);
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else sound_render(0, PsndLen);
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if (emustatus&1) emustatus|=2; else emustatus&=~2;
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if (PicoWriteSound) PicoWriteSound();
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// clear sound buffer
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memset(PsndOut, 0, (PicoOpt & 8) ? (PsndLen<<2) : (PsndLen<<1));
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}
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else if(emustatus & 3) {
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emustatus|= 2;
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emustatus&=~1;
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sound_render(0, PsndLen/2);
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}
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}
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// Accurate but slower frame which does hints
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static int PicoFrameHintsMCD(void)
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{
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struct PicoVideo *pv=&Pico.video;
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int total_z80=0,lines,y,lines_vis = 224,z80CycleAim = 0,line_sample,counter75hz_lim;
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const int cycles_68k=488,cycles_z80=228,cycles_s68k=795; // both PAL and NTSC compile to same values
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int skip=PicoSkipFrame || (PicoOpt&0x10);
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int hint; // Hint counter
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if(Pico.m.pal) { //
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//cycles_68k = (int) ((double) OSC_PAL / 7 / 50 / 312 + 0.4); // should compile to a constant (488)
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//cycles_z80 = (int) ((double) OSC_PAL / 15 / 50 / 312 + 0.4); // 228
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lines = 312; // Steve Snake says there are 313 lines, but this seems to also work well
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line_sample = 68;
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counter75hz_lim = 2080;
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if(pv->reg[1]&8) lines_vis = 240;
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} else {
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//cycles_68k = (int) ((double) OSC_NTSC / 7 / 60 / 262 + 0.4); // 488
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//cycles_z80 = (int) ((double) OSC_NTSC / 15 / 60 / 262 + 0.4); // 228
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lines = 262;
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counter75hz_lim = 2096;
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line_sample = 93;
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}
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SekCyclesReset();
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SekCyclesResetS68k();
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//z80ExtraCycles = 0;
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if(PicoOpt&4)
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z80CycleAim = 0;
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// z80_resetCycles();
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pv->status&=~0x88; // clear V-Int, come out of vblank
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hint=pv->reg[10]; // Load H-Int counter
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//dprintf("-hint: %i", hint);
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for (y=0;y<lines;y++)
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{
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Pico.m.scanline=(short)y;
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// pad delay (for 6 button pads)
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if(PicoOpt&0x20) {
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if(Pico.m.padDelay[0]++ > 25) Pico.m.padTHPhase[0]=0;
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if(Pico.m.padDelay[1]++ > 25) Pico.m.padTHPhase[1]=0;
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}
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check_cd_dma();
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// H-Interrupts:
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if(y <= lines_vis && --hint < 0) // y <= lines_vis: Comix Zone, Golden Axe
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{
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//dprintf("rhint:old @ %06x", SekPc);
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hint=pv->reg[10]; // Reload H-Int counter
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pv->pending_ints|=0x10;
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if (pv->reg[0]&0x10) SekInterrupt(4);
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//dprintf("rhint: %i @ %06x [%i|%i]", hint, SekPc, y, SekCycleCnt);
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//dprintf("hint_routine: %x", (*(unsigned short*)(Pico.ram+0x0B84)<<16)|*(unsigned short*)(Pico.ram+0x0B86));
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}
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// V-Interrupt:
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if (y == lines_vis)
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{
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//dprintf("vint: @ %06x [%i|%i]", SekPc, y, SekCycleCnt);
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pv->status|=0x88; // V-Int happened, go into vblank
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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)
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/*if(Pico.m.z80Run && (PicoOpt&4)) {
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z80CycleAim+=cycles_z80/2;
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total_z80+=z80_run(z80CycleAim-total_z80);
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z80CycleAim-=cycles_z80/2;
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}*/
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pv->pending_ints|=0x20;
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if(pv->reg[1]&0x20) SekInterrupt(6);
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if(Pico.m.z80Run && (PicoOpt&4)) // ?
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z80_int();
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//dprintf("zint: [%i|%i] zPC=%04x", Pico.m.scanline, SekCyclesDone(), mz80GetRegisterValue(NULL, 0));
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}
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// decide if we draw this line
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#if CAN_HANDLE_240_LINES
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if(!skip && ((!(pv->reg[1]&8) && y<224) || ((pv->reg[1]&8) && y<240)) )
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#else
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if(!skip && y<224)
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#endif
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PicoLine(y);
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if(PicoOpt&1)
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sound_timers_and_dac(y);
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// get samples from sound chips
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if(y == 32 && PsndOut)
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emustatus &= ~1;
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else if((y == 224 || y == line_sample) && PsndOut)
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getSamples(y);
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// Run scanline:
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//dprintf("m68k starting exec @ %06x", SekPc);
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if(Pico.m.dma_bytes) SekCycleCnt+=CheckDMA();
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SekRun(cycles_68k);
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if ((Pico_mcd->m.busreq&3) == 1) { // no busreq/no reset
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#if 0
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int i;
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FILE *f = fopen("prg_ram.bin", "wb");
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for (i = 0; i < 0x80000; i+=2)
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{
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int tmp = Pico_mcd->prg_ram[i];
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Pico_mcd->prg_ram[i] = Pico_mcd->prg_ram[i+1];
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Pico_mcd->prg_ram[i+1] = tmp;
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}
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fwrite(Pico_mcd->prg_ram, 1, 0x80000, f);
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fclose(f);
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exit(1);
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#endif
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//dprintf("s68k starting exec @ %06x", SekPcS68k);
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SekRunS68k(cycles_s68k);
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}
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if((PicoOpt&4) && Pico.m.z80Run) {
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Pico.m.z80Run|=2;
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z80CycleAim+=cycles_z80;
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total_z80+=z80_run(z80CycleAim-total_z80);
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}
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if ((Pico_mcd->m.counter75hz+=10) >= counter75hz_lim) {
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Pico_mcd->m.counter75hz -= counter75hz_lim;
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Check_CD_Command();
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}
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if (Pico_mcd->rot_comp.Reg_58 & 0x8000)
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gfx_cd_update();
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}
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// draw a frame just after vblank in alternative render mode
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if(!PicoSkipFrame && (PicoOpt&0x10))
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PicoFrameFull();
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return 0;
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}
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int PicoFrameMCD(void)
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{
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if(!(PicoOpt&0x10))
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PicoFrameStart();
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PicoFrameHintsMCD();
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return 0;
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}
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