| 1 | // This is part of Pico Library |
| 2 | |
| 3 | // (c) Copyright 2004 Dave, All rights reserved. |
| 4 | // (c) Copyright 2007 notaz, All rights reserved. |
| 5 | // Free for non-commercial use. |
| 6 | |
| 7 | // For commercial use, separate licencing terms must be obtained. |
| 8 | |
| 9 | |
| 10 | #include "../PicoInt.h" |
| 11 | #include "../sound/sound.h" |
| 12 | |
| 13 | |
| 14 | static int counter75hz = 0; // TODO: move 2 context |
| 15 | |
| 16 | |
| 17 | int PicoInitMCD(void) |
| 18 | { |
| 19 | SekInitS68k(); |
| 20 | Init_CD_Driver(); |
| 21 | |
| 22 | return 0; |
| 23 | } |
| 24 | |
| 25 | |
| 26 | void PicoExitMCD(void) |
| 27 | { |
| 28 | End_CD_Driver(); |
| 29 | } |
| 30 | |
| 31 | int PicoResetMCD(int hard) |
| 32 | { |
| 33 | // clear everything except BIOS |
| 34 | memset(Pico_mcd->prg_ram, 0, sizeof(mcd_state) - sizeof(Pico_mcd->bios)); |
| 35 | PicoMCD |= 2; // s68k reset pending |
| 36 | Pico_mcd->s68k_regs[3] = 1; // 2M word RAM mode with m68k access after reset |
| 37 | counter75hz = 0; |
| 38 | |
| 39 | LC89510_Reset(); |
| 40 | Reset_CD(); |
| 41 | |
| 42 | return 0; |
| 43 | } |
| 44 | |
| 45 | static __inline void SekRun(int cyc) |
| 46 | { |
| 47 | int cyc_do; |
| 48 | SekCycleAim+=cyc; |
| 49 | if((cyc_do=SekCycleAim-SekCycleCnt) < 0) return; |
| 50 | #if defined(EMU_M68K) |
| 51 | m68k_set_context(&PicoM68kCPU); |
| 52 | SekCycleCnt+=m68k_execute(cyc_do); |
| 53 | #endif |
| 54 | } |
| 55 | |
| 56 | static __inline void SekRunS68k(int cyc) |
| 57 | { |
| 58 | int cyc_do; |
| 59 | SekCycleAimS68k+=cyc; |
| 60 | if((cyc_do=SekCycleAimS68k-SekCycleCntS68k) < 0) return; |
| 61 | #if defined(EMU_M68K) |
| 62 | m68k_set_context(&PicoS68kCPU); |
| 63 | SekCycleCntS68k+=m68k_execute(cyc_do); |
| 64 | #endif |
| 65 | } |
| 66 | |
| 67 | static int Status_CDC; |
| 68 | |
| 69 | static __inline void check_cd_dma(void) |
| 70 | { |
| 71 | int ddx; |
| 72 | |
| 73 | if (!(Status_CDC & 0x08)) return; |
| 74 | |
| 75 | ddx = Pico_mcd->s68k_regs[4] & 7; |
| 76 | if (ddx < 2) return; // invalid |
| 77 | if (ddx < 4) Pico_mcd->s68k_regs[4] |= 0x40; // Data set ready in host port |
| 78 | if (ddx == 6) return; // invalid |
| 79 | |
| 80 | Update_CDC_TRansfer(ddx); // now go and do the actual transfer |
| 81 | } |
| 82 | |
| 83 | |
| 84 | // Accurate but slower frame which does hints |
| 85 | static int PicoFrameHintsMCD(void) |
| 86 | { |
| 87 | struct PicoVideo *pv=&Pico.video; |
| 88 | int total_z80=0,lines,y,lines_vis = 224,z80CycleAim = 0,line_sample,counter75hz_lim; |
| 89 | const int cycles_68k=488,cycles_z80=228,cycles_s68k=795; // both PAL and NTSC compile to same values |
| 90 | int skip=PicoSkipFrame || (PicoOpt&0x10); |
| 91 | int hint; // Hint counter |
| 92 | |
| 93 | if(Pico.m.pal) { // |
| 94 | //cycles_68k = (int) ((double) OSC_PAL / 7 / 50 / 312 + 0.4); // should compile to a constant (488) |
| 95 | //cycles_z80 = (int) ((double) OSC_PAL / 15 / 50 / 312 + 0.4); // 228 |
| 96 | lines = 312; // Steve Snake says there are 313 lines, but this seems to also work well |
| 97 | line_sample = 68; |
| 98 | counter75hz_lim = 2080; |
| 99 | if(pv->reg[1]&8) lines_vis = 240; |
| 100 | } else { |
| 101 | //cycles_68k = (int) ((double) OSC_NTSC / 7 / 60 / 262 + 0.4); // 488 |
| 102 | //cycles_z80 = (int) ((double) OSC_NTSC / 15 / 60 / 262 + 0.4); // 228 |
| 103 | lines = 262; |
| 104 | counter75hz_lim = 2096; |
| 105 | line_sample = 93; |
| 106 | } |
| 107 | |
| 108 | SekCyclesReset(); |
| 109 | SekCyclesResetS68k(); |
| 110 | //z80ExtraCycles = 0; |
| 111 | |
| 112 | if(PicoOpt&4) |
| 113 | z80CycleAim = 0; |
| 114 | // z80_resetCycles(); |
| 115 | |
| 116 | pv->status&=~0x88; // clear V-Int, come out of vblank |
| 117 | |
| 118 | hint=pv->reg[10]; // Load H-Int counter |
| 119 | //dprintf("-hint: %i", hint); |
| 120 | |
| 121 | for (y=0;y<lines;y++) |
| 122 | { |
| 123 | Pico.m.scanline=(short)y; |
| 124 | |
| 125 | // pad delay (for 6 button pads) |
| 126 | if(PicoOpt&0x20) { |
| 127 | if(Pico.m.padDelay[0]++ > 25) Pico.m.padTHPhase[0]=0; |
| 128 | if(Pico.m.padDelay[1]++ > 25) Pico.m.padTHPhase[1]=0; |
| 129 | } |
| 130 | |
| 131 | check_cd_dma(); |
| 132 | |
| 133 | // H-Interrupts: |
| 134 | if(y <= lines_vis && --hint < 0) // y <= lines_vis: Comix Zone, Golden Axe |
| 135 | { |
| 136 | //dprintf("rhint:old @ %06x", SekPc); |
| 137 | hint=pv->reg[10]; // Reload H-Int counter |
| 138 | pv->pending_ints|=0x10; |
| 139 | if (pv->reg[0]&0x10) SekInterrupt(4); |
| 140 | //dprintf("rhint: %i @ %06x [%i|%i]", hint, SekPc, y, SekCycleCnt); |
| 141 | //dprintf("hint_routine: %x", (*(unsigned short*)(Pico.ram+0x0B84)<<16)|*(unsigned short*)(Pico.ram+0x0B86)); |
| 142 | } |
| 143 | |
| 144 | // V-Interrupt: |
| 145 | if (y == lines_vis) |
| 146 | { |
| 147 | //dprintf("vint: @ %06x [%i|%i]", SekPc, y, SekCycleCnt); |
| 148 | pv->status|=0x88; // V-Int happened, go into vblank |
| 149 | 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) |
| 150 | /*if(Pico.m.z80Run && (PicoOpt&4)) { |
| 151 | z80CycleAim+=cycles_z80/2; |
| 152 | total_z80+=z80_run(z80CycleAim-total_z80); |
| 153 | z80CycleAim-=cycles_z80/2; |
| 154 | }*/ |
| 155 | pv->pending_ints|=0x20; |
| 156 | if(pv->reg[1]&0x20) SekInterrupt(6); |
| 157 | if(Pico.m.z80Run && (PicoOpt&4)) // ? |
| 158 | z80_int(); |
| 159 | //dprintf("zint: [%i|%i] zPC=%04x", Pico.m.scanline, SekCyclesDone(), mz80GetRegisterValue(NULL, 0)); |
| 160 | } |
| 161 | |
| 162 | // decide if we draw this line |
| 163 | #if CAN_HANDLE_240_LINES |
| 164 | if(!skip && ((!(pv->reg[1]&8) && y<224) || ((pv->reg[1]&8) && y<240)) ) |
| 165 | #else |
| 166 | if(!skip && y<224) |
| 167 | #endif |
| 168 | PicoLine(y); |
| 169 | |
| 170 | if(PicoOpt&1) |
| 171 | sound_timers_and_dac(y); |
| 172 | |
| 173 | // get samples from sound chips |
| 174 | if(y == 32 && PsndOut) |
| 175 | emustatus &= ~1; |
| 176 | else if((y == 224 || y == line_sample) && PsndOut) |
| 177 | ;//getSamples(y); |
| 178 | |
| 179 | // Run scanline: |
| 180 | //dprintf("m68k starting exec @ %06x", SekPc); |
| 181 | if(Pico.m.dma_bytes) SekCycleCnt+=CheckDMA(); |
| 182 | SekRun(cycles_68k); |
| 183 | if ((Pico_mcd->m68k_regs[1]&3) == 1) { // no busreq/no reset |
| 184 | #if 0 |
| 185 | int i; |
| 186 | FILE *f = fopen("prg_ram.bin", "wb"); |
| 187 | for (i = 0; i < 0x80000; i+=2) |
| 188 | { |
| 189 | int tmp = Pico_mcd->prg_ram[i]; |
| 190 | Pico_mcd->prg_ram[i] = Pico_mcd->prg_ram[i+1]; |
| 191 | Pico_mcd->prg_ram[i+1] = tmp; |
| 192 | } |
| 193 | fwrite(Pico_mcd->prg_ram, 1, 0x80000, f); |
| 194 | fclose(f); |
| 195 | exit(1); |
| 196 | #endif |
| 197 | //dprintf("s68k starting exec @ %06x", SekPcS68k); |
| 198 | SekRunS68k(cycles_s68k); |
| 199 | } |
| 200 | |
| 201 | if((PicoOpt&4) && Pico.m.z80Run) { |
| 202 | Pico.m.z80Run|=2; |
| 203 | z80CycleAim+=cycles_z80; |
| 204 | total_z80+=z80_run(z80CycleAim-total_z80); |
| 205 | } |
| 206 | |
| 207 | if ((counter75hz+=10) >= counter75hz_lim) { |
| 208 | counter75hz -= counter75hz_lim; |
| 209 | Check_CD_Command(); |
| 210 | } |
| 211 | } |
| 212 | |
| 213 | // draw a frame just after vblank in alternative render mode |
| 214 | if(!PicoSkipFrame && (PicoOpt&0x10)) |
| 215 | PicoFrameFull(); |
| 216 | |
| 217 | return 0; |
| 218 | } |
| 219 | |
| 220 | |
| 221 | int PicoFrameMCD(void) |
| 222 | { |
| 223 | if(!(PicoOpt&0x10)) |
| 224 | PicoFrameStart(); |
| 225 | |
| 226 | PicoFrameHintsMCD(); |
| 227 | |
| 228 | return 0; |
| 229 | } |
| 230 | |
| 231 | |