1 // This is part of Pico Library
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3 // (c) Copyright 2004 Dave, All rights reserved.
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4 // (c) Copyright 2006 notaz, All rights reserved.
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5 // Free for non-commercial use.
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7 // For commercial use, separate licencing terms must be obtained.
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10 #include "PicoInt.h"
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11 #include "sound/sound.h"
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12 #include "sound/ym2612.h"
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16 int PicoOpt=0; // disable everything by default
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17 int PicoSkipFrame=0; // skip rendering frame?
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18 int PicoRegionOverride = 0; // override the region detection 0: Auto, 1: Japan NTSC, 2: Japan PAL, 4: US, 8: Europe
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20 void (*PicoWriteSound)(void) = 0; // called once per frame at the best time to send sound buffer (PsndOut) to hardware
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22 struct PicoSRAM SRam;
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23 int z80startCycle = 0, z80stopCycle = 0; // in 68k cycles
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24 //int z80ExtraCycles = 0;
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25 int PicoPad[2]; // Joypads, format is SACB RLDU
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26 int PicoMCD = 0; // mega CD status
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28 // to be called once on emu init
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31 // Blank space for state:
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32 memset(&Pico,0,sizeof(Pico));
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33 memset(&PicoPad,0,sizeof(PicoPad));
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37 z80_init(); // init even if we aren't going to use it
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39 // Setup memory callbacks:
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51 // to be called once on emu exit
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58 if(SRam.data) free(SRam.data); SRam.data=0;
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61 int PicoReset(int hard)
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63 unsigned int region=0;
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64 int support=0,hw=0,i=0;
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65 unsigned char pal=0;
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67 if (Pico.romsize<=0) return 1;
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74 // reset VDP state, VRAM and PicoMisc
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75 //memset(&Pico.video,0,sizeof(Pico.video));
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76 //memset(&Pico.vram,0,sizeof(Pico.vram));
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77 memset(&Pico.m,0,sizeof(Pico.m));
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78 Pico.video.pending_ints=0;
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82 // clear all memory of the emulated machine
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83 memset(&Pico.ram,0,(unsigned int)&Pico.rom-(unsigned int)&Pico.ram);
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86 // default VDP register values (based on Fusion)
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87 Pico.video.reg[0] = Pico.video.reg[1] = 0x04;
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88 Pico.video.reg[0xc] = 0x81;
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89 Pico.video.reg[0xf] = 0x02;
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90 Pico.m.dirtyPal = 1;
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92 if(PicoRegionOverride)
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94 support = PicoRegionOverride;
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98 // Read cartridge region data:
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99 region=PicoRead32(0x1f0);
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105 c=region>>(i<<3); c&=0xff;
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106 if (c<=' ') continue;
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108 if (c=='J') support|=1;
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109 else if (c=='U') support|=4;
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110 else if (c=='E') support|=8;
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116 support|=strtol(s,NULL,16);
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121 // Try to pick the best hardware value for English/50hz:
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122 if (support&8) { hw=0xc0; pal=1; } // Europe
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123 else if (support&4) hw=0x80; // USA
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124 else if (support&2) { hw=0x40; pal=1; } // Japan PAL
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125 else if (support&1) hw=0x00; // Japan NTSC
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126 else hw=0x80; // USA
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128 Pico.m.hardware=(unsigned char)(hw|0x20); // No disk attached
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130 Pico.video.status = 0x3408 | pal; // always set bits | vblank | pal
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132 sound_reset(); // pal must be known here
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135 PicoResetMCD(hard);
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144 if(SRam.data) free(SRam.data); SRam.data=0;
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145 Pico.m.sram_reg = 0;
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147 if(*(Pico.rom+0x1B1) == 'R' && *(Pico.rom+0x1B0) == 'A') {
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148 if(*(Pico.rom+0x1B2) & 0x40) {
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150 // what kind of EEPROMs are actually used? X24C02? X24C04? (X24C01 has only 128), but we will support up to 8K
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151 SRam.start = PicoRead32(0x1B4) & ~1; // zero address is used for clock by some games
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152 SRam.end = PicoRead32(0x1B8);
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153 sram_size = 0x2000;
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154 Pico.m.sram_reg = 4;
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157 SRam.start = PicoRead32(0x1B4) & 0xFFFF00;
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158 SRam.end = PicoRead32(0x1B8) | 1;
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159 sram_size = SRam.end - SRam.start + 1;
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161 Pico.m.sram_reg |= 0x10; // SRAM was detected
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163 if(sram_size <= 0) {
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164 // some games may have bad headers, like S&K and Sonic3
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165 SRam.start = 0x200000;
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166 SRam.end = 0x203FFF;
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167 sram_size = 0x004000;
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170 // enable sram access by default if it doesn't overlap with ROM
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171 if(Pico.romsize <= SRam.start) Pico.m.sram_reg |= 1;
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172 SRam.reg_back = Pico.m.sram_reg;
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175 SRam.data = (unsigned char *) calloc(sram_size, 1);
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176 if(!SRam.data) return 1;
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179 // Dino Dini's Soccer malfunctions if SRAM is not filled with 0xff
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180 if (strncmp((char *)Pico.rom+0x150, "IDOND NI'I", 10) == 0)
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181 memset(SRam.data, 0xff, sram_size);
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184 Pico.m.sram_reg = SRam.reg_back; // restore sram_reg
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190 static __inline void SekRun(int cyc)
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194 if((cyc_do=SekCycleAim-SekCycleCnt) < 0) return;
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195 #if defined(EMU_C68K) && defined(EMU_M68K)
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196 // this means we do run-compare Cyclone vs Musashi
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197 SekCycleCnt+=CM_compareRun(cyc_do);
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198 #elif defined(EMU_C68K)
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199 PicoCpu.cycles=cyc_do;
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200 CycloneRun(&PicoCpu);
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201 SekCycleCnt+=cyc_do-PicoCpu.cycles;
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202 #elif defined(EMU_A68K)
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203 m68k_ICount=cyc_do;
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205 SekCycleCnt+=cyc_do-m68k_ICount;
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206 #elif defined(EMU_M68K)
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207 SekCycleCnt+=m68k_execute(cyc_do);
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211 static __inline void SekStep(void)
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213 // this is required for timing sensitive stuff to work
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214 int realaim=SekCycleAim; SekCycleAim=SekCycleCnt+1;
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215 #if defined(EMU_C68K) && defined(EMU_M68K)
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216 // this means we do run-compare Cyclone vs Musashi
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217 SekCycleCnt+=CM_compareRun(1);
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218 #elif defined(EMU_C68K)
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220 CycloneRun(&PicoCpu);
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221 SekCycleCnt+=1-PicoCpu.cycles;
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222 #elif defined(EMU_A68K)
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225 SekCycleCnt+=1-m68k_ICount;
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226 #elif defined(EMU_M68K)
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227 SekCycleCnt+=m68k_execute(1);
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229 SekCycleAim=realaim;
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232 static int CheckIdle(void)
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235 unsigned char state[0x88];
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237 memset(state,0,sizeof(state));
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239 // See if the state is the same after 2 steps:
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240 SekState(state); SekStep(); SekStep(); SekState(state+0x44);
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241 if (memcmp(state,state+0x44,0x44)==0) return 1;
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243 unsigned char state[0x44];
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244 static unsigned char oldstate[0x44];
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247 if(memcmp(state,oldstate,0x40)==0) return 1;
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248 memcpy(oldstate, state, 0x40);
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254 // to be called on 224 or line_sample scanlines only
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255 static __inline void getSamples(int y)
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258 //dprintf("sta%i: %i [%i]", (emustatus & 2), emustatus, y);
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260 sound_render(PsndLen/2, PsndLen-PsndLen/2);
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261 else sound_render(0, PsndLen);
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262 if (emustatus&1) emustatus|=2; else emustatus&=~2;
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263 if (PicoWriteSound) PicoWriteSound();
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264 // clear sound buffer
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265 memset(PsndOut, 0, (PicoOpt & 8) ? (PsndLen<<2) : (PsndLen<<1));
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267 else if(emustatus & 3) {
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270 sound_render(0, PsndLen/2);
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274 //extern UINT32 mz80GetRegisterValue(void *, UINT32);
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276 // Accurate but slower frame which does hints
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277 static int PicoFrameHints(void)
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279 struct PicoVideo *pv=&Pico.video;
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280 int total_z80=0,lines,y,lines_vis = 224,z80CycleAim = 0,line_sample;
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281 const int cycles_68k=488,cycles_z80=228; // both PAL and NTSC compile to same values
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282 int skip=PicoSkipFrame || (PicoOpt&0x10);
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283 int hint; // Hint counter
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285 if(Pico.m.pal) { //
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286 //cycles_68k = (int) ((double) OSC_PAL / 7 / 50 / 312 + 0.4); // should compile to a constant (488)
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287 //cycles_z80 = (int) ((double) OSC_PAL / 15 / 50 / 312 + 0.4); // 228
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288 lines = 312; // Steve Snake says there are 313 lines, but this seems to also work well
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290 if(pv->reg[1]&8) lines_vis = 240;
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292 //cycles_68k = (int) ((double) OSC_NTSC / 7 / 60 / 262 + 0.4); // 488
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293 //cycles_z80 = (int) ((double) OSC_NTSC / 15 / 60 / 262 + 0.4); // 228
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299 //z80ExtraCycles = 0;
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303 // z80_resetCycles();
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305 pv->status&=~0x88; // clear V-Int, come out of vblank
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307 hint=pv->reg[10]; // Load H-Int counter
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308 //dprintf("-hint: %i", hint);
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310 for (y=0;y<lines;y++)
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312 Pico.m.scanline=(short)y;
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314 // pad delay (for 6 button pads)
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316 if(Pico.m.padDelay[0]++ > 25) Pico.m.padTHPhase[0]=0;
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317 if(Pico.m.padDelay[1]++ > 25) Pico.m.padTHPhase[1]=0;
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321 if(y <= lines_vis && --hint < 0) // y <= lines_vis: Comix Zone, Golden Axe
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323 //dprintf("rhint:old @ %06x", SekPc);
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324 hint=pv->reg[10]; // Reload H-Int counter
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325 pv->pending_ints|=0x10;
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326 if (pv->reg[0]&0x10) SekInterrupt(4);
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327 //dprintf("rhint: %i @ %06x [%i|%i]", hint, SekPc, y, SekCycleCnt);
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328 //dprintf("hint_routine: %x", (*(unsigned short*)(Pico.ram+0x0B84)<<16)|*(unsigned short*)(Pico.ram+0x0B86));
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332 if (y == lines_vis)
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334 //dprintf("vint: @ %06x [%i|%i]", SekPc, y, SekCycleCnt);
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335 pv->status|=0x88; // V-Int happened, go into vblank
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336 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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337 /*if(Pico.m.z80Run && (PicoOpt&4)) {
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338 z80CycleAim+=cycles_z80/2;
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339 total_z80+=z80_run(z80CycleAim-total_z80);
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340 z80CycleAim-=cycles_z80/2;
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342 pv->pending_ints|=0x20;
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343 if(pv->reg[1]&0x20) SekInterrupt(6);
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344 if(Pico.m.z80Run && (PicoOpt&4)) // ?
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346 //dprintf("zint: [%i|%i] zPC=%04x", Pico.m.scanline, SekCyclesDone(), mz80GetRegisterValue(NULL, 0));
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349 // decide if we draw this line
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350 #if CAN_HANDLE_240_LINES
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351 if(!skip && ((!(pv->reg[1]&8) && y<224) || ((pv->reg[1]&8) && y<240)) )
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358 sound_timers_and_dac(y);
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360 // get samples from sound chips
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361 if(y == 32 && PsndOut)
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363 else if((y == 224 || y == line_sample) && PsndOut)
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367 SekRun(cycles_68k);
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368 if((PicoOpt&4) && Pico.m.z80Run) {
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370 z80CycleAim+=cycles_z80;
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371 total_z80+=z80_run(z80CycleAim-total_z80);
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375 // draw a frame just after vblank in alternative render mode
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376 if(!PicoSkipFrame && (PicoOpt&0x10))
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382 // helper z80 runner
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383 static void PicoRunZ80Simple(int line_from, int line_to)
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385 int line_from_r=line_from, line_to_r=line_to, line = line_from;
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386 int line_sample = Pico.m.pal ? 68 : 93;
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387 extern const unsigned short vcounts[];
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389 if(!(PicoOpt&4) || Pico.m.z80Run == 0) { line_from_r = line_to_r; line_to_r = 0; }
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391 if(z80startCycle != 0) {
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392 line_from_r = vcounts[z80startCycle>>8]+1;
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395 if(z80stopCycle != 0) {
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396 line_to_r = vcounts[z80stopCycle>>8]+1;
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401 // we have ym2612 enabled, so we have to run Z80 in lines, so we could update DAC and timers
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402 for(; line < line_to; line++) {
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403 sound_timers_and_dac(line);
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404 if((line == 224 || line == line_sample) && PsndOut) getSamples(line);
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405 if(line == 32 && PsndOut) emustatus &= ~1;
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406 if(line >= line_from_r && line < line_to_r)
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409 } else if(line_to_r-line_from_r > 0) {
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410 z80_run(228*(line_to_r-line_from_r));
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411 // samples will be taken by caller
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415 // Simple frame without H-Ints
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416 static int PicoFrameSimple(void)
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418 struct PicoVideo *pv=&Pico.video;
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419 int y=0,line=0,lines=0,lines_step=0,sects;
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420 int cycles_68k_vblock,cycles_68k_block;
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423 // M68k cycles/frame: 152009.78
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424 if(pv->reg[1]&8) { // 240 lines
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425 cycles_68k_block = (int) ((double) OSC_PAL / 7 / 50 / 312 * 15 + 0.4); // 16 sects, 16*15=240, 7308
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426 cycles_68k_vblock = (int) ((double) OSC_PAL / 7 / 50 / 312 * 24 + 0.4); // 3 sects, 3*24=72, 35163?
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429 cycles_68k_block = (int) ((double) OSC_PAL / 7 / 50 / 312 * 14 + 0.4); // 16*14=224
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430 cycles_68k_vblock = (int) ((double) OSC_PAL / 7 / 50 / 312 * 22 + 0.4); // 4 sects, 4*22=88
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434 // M68k cycles/frame: 127840.71
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435 cycles_68k_block = (int) ((double) OSC_NTSC / 7 / 60 / 262 * 14 + 0.4); // 16*14=224, 6831
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436 cycles_68k_vblock = (int) ((double) OSC_NTSC / 7 / 60 / 262 * 19 + 0.4); // 2 sects, 2*19=38, 18544
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440 Pico.m.scanline=-1;
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447 // 6 button pad: let's just say it timed out now
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448 Pico.m.padTHPhase[0]=Pico.m.padTHPhase[1]=0;
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450 // ---- Active Scan ----
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451 pv->status&=~88; // clear V-Int, come out of vblank
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453 // Run in sections:
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454 for(sects=16; sects; sects--)
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456 if (CheckIdle()) break;
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458 lines += lines_step;
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459 SekRun(cycles_68k_block);
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461 PicoRunZ80Simple(line, lines);
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465 // run Z80 for remaining sections
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467 int c = sects*cycles_68k_block;
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469 lines += sects*lines_step;
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470 PicoRunZ80Simple(line, lines);
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471 // this is for approriate line counter, etc
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476 // here we render sound if ym2612 is disabled
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477 if(!(PicoOpt&1) && PsndOut) {
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478 sound_render(0, PsndLen);
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479 if(PicoWriteSound) PicoWriteSound();
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480 // clear sound buffer
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481 memset(PsndOut, 0, (PicoOpt & 8) ? (PsndLen<<2) : (PsndLen<<1));
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485 if(!PicoSkipFrame) {
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486 if(!(PicoOpt&0x10))
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488 #if CAN_HANDLE_240_LINES
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490 for (y=0;y<240;y++) PicoLine(y);
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492 for (y=0;y<224;y++) PicoLine(y);
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495 for (y=0;y<224;y++) PicoLine(y);
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497 else PicoFrameFull();
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500 // ---- V-Blanking period ----
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503 if(pv->reg[1]&8) { // 240 lines
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504 lines = line = 240;
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508 lines = line = 224;
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513 lines = line = 224;
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518 //dprintf("vint: @ %06x [%i]", SekPc, SekCycleCnt);
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519 pv->pending_ints|=0x20;
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520 if (pv->reg[1]&0x20) SekInterrupt(6); // Set IRQ
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521 pv->status|=0x88; // V-Int happened / go into vblank
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522 if(Pico.m.z80Run && (PicoOpt&4)) // ?
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526 lines += lines_step;
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528 SekRun(cycles_68k_vblock);
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530 PicoRunZ80Simple(line, lines);
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534 if(sects && CheckIdle()) break;
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537 // run Z80 for remaining sections
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539 lines += sects*lines_step;
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540 PicoRunZ80Simple(line, lines);
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546 int PicoFrame(void)
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555 // be accurate if we are asked for this
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556 if(PicoOpt&0x40) acc=1;
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557 // don't be accurate in alternative render mode, as hint effects will not be rendered anyway
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558 else if(PicoOpt&0x10) acc = 0;
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559 else acc=Pico.video.reg[0]&0x10; // be accurate if hints are used
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561 //if(Pico.video.reg[12]&0x2) Pico.video.status ^= 0x10; // change odd bit in interlace mode
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563 if(!(PicoOpt&0x10))
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568 else PicoFrameSimple();
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573 static int DefaultCram(int cram)
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576 // Convert 0000bbbb ggggrrrr
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577 // to rrrr1ggg g10bbbb1
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578 high|=(cram&0x00f)<<12; // Red
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579 high|=(cram&0x0f0)<< 3; // Green
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580 high|=(cram&0xf00)>> 7; // Blue
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584 // Function to convert Megadrive Cram into a native colour:
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585 int (*PicoCram)(int cram)=DefaultCram;
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587 #if defined(__DEBUG_PRINT) || defined(WIN32)
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588 // tmp debug: dump some stuff
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589 #define bit(r, x) ((r>>x)&1)
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590 void z80_debug(char *dstr);
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591 char *debugString()
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594 static char dstr[1024];
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595 unsigned char *reg=Pico.video.reg, r;
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598 sprintf(dstr, "mode set 1: %02x\n", (r=reg[0]));
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599 sprintf(dstr, "%sdisplay_disable: %i, M3: %i, palette: %i, ?, hints: %i\n\n", dstr, bit(r,0), bit(r,1), bit(r,2), bit(r,4));
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600 sprintf(dstr, "%smode set 2: %02x\n", dstr, (r=reg[1]));
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601 sprintf(dstr, "%sSMS/genesis: %i, pal: %i, dma: %i, vints: %i, disp: %i, TMS9918: %i\n\n",dstr, bit(r,2), bit(r,3), bit(r,4), bit(r,5), bit(r,6), bit(r,7));
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602 sprintf(dstr, "%smode set 3: %02x\n", dstr, (r=reg[0xB]));
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603 sprintf(dstr, "%sLSCR: %i, HSCR: %i, 2cell vscroll: %i, IE2: %i\n\n", dstr, bit(r,0), bit(r,1), bit(r,2), bit(r,3));
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604 sprintf(dstr, "%smode set 4: %02x\n", dstr, (r=reg[0xC]));
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605 sprintf(dstr, "%sinterlace: %i%i; cells: %i; shadow: %i\n\n", dstr, bit(r,2), bit(r,1), (r&0x80) ? 40 : 32, bit(r,3));
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606 sprintf(dstr, "%sscroll size: w: %i; h: %i\n\n", dstr, reg[0x10]&3, (reg[0x10]&0x30)>>4);
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607 sprintf(dstr, "%sSRAM: det: %i; eeprom: %i\n", dstr, bit(Pico.m.sram_reg, 4), bit(Pico.m.sram_reg, 2));
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608 sprintf(dstr, "%sCPU state: PC: %06x cycles: %i\n", dstr, SekPc, SekCyclesDoneT());
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610 for(r=0; r < 8; r++)
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611 sprintf(dstr, "%sd%i=%08x, a%i=%08x\n", dstr, r, PicoCpu.d[r], r, PicoCpu.a[r]);
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616 struct PicoVideo *pvid=&Pico.video;
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619 static char dstr[1024*8];
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622 table=pvid->reg[5]&0x7f;
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623 if (pvid->reg[12]&1) table&=0x7e; // Lowest bit 0 in 40-cell mode
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624 table<<=8; // Get sprite table address/2
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626 for (i=u=n=0; u < 80 && n < 20; u++)
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628 unsigned int *sprite;
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629 int code, code2, sx, sy, height;
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631 sprite=(unsigned int *)(Pico.vram+((table+(link<<2))&0x7ffc)); // Find sprite
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636 // check if it is on this line
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637 sy = (code&0x1ff);//-0x80;
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638 height = ((code>>24)&3)+1;
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642 sx = (code2>>16)&0x1ff;
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644 dprintf("#%02i x: %03i y: %03i %ix%i", u, sx, sy, ((code>>26)&3)+1, height);
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646 link=(code>>16)&0x7f;
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647 if(!link) break; // End of sprites
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653 FILE *f = fopen("zram", "wb");
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654 fwrite(Pico.zram, 1, 0x2000, f);
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