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/ym2612.h"
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15 int PicoOpt=0; // disable everything by default
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16 int PicoSkipFrame=0; // skip rendering frame?
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17 int PicoRegionOverride = 0; // override the region detection 0: Auto, 1: Japan NTSC, 2: Japan PAL, 4: US, 8: Europe
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18 int PicoAutoRgnOrder = 0;
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19 int emustatus = 0; // rapid_ym2612, multi_ym_updates
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20 void (*PicoWriteSound)(int len) = NULL; // called at the best time to send sound buffer (PsndOut) to hardware
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21 void (*PicoResetHook)(void) = NULL;
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22 void (*PicoLineHook)(void) = NULL;
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24 struct PicoSRAM SRam = {0,};
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25 int z80startCycle, z80stopCycle; // in 68k cycles
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26 int PicoPad[2]; // Joypads, format is SACB RLDU
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27 int PicoMCD = 0; // mega CD status: scd_started
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29 // to be called once on emu init
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32 // Blank space for state:
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33 memset(&Pico,0,sizeof(Pico));
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34 memset(&PicoPad,0,sizeof(PicoPad));
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38 z80_init(); // init even if we aren't going to use it
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47 // to be called once on emu exit
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54 if(SRam.data) free(SRam.data); SRam.data=0;
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57 int PicoReset(int hard)
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59 unsigned int region=0;
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60 int support=0,hw=0,i=0;
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61 unsigned char pal=0;
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62 unsigned char sram_reg=Pico.m.sram_reg; // must be preserved
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64 if (Pico.romsize<=0) return 1;
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68 // s68k doesn't have the TAS quirk, so we just globally set normal TAS handler in MCD mode (used by Batman games).
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69 SekSetRealTAS(PicoMCD & 1);
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73 // reset VDP state, VRAM and PicoMisc
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74 //memset(&Pico.video,0,sizeof(Pico.video));
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75 //memset(&Pico.vram,0,sizeof(Pico.vram));
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76 memset(Pico.ioports,0,sizeof(Pico.ioports)); // needed for MCD to reset properly
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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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111 else if (c=='j') {support|=1; break; }
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112 else if (c=='u') {support|=4; break; }
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113 else if (c=='e') {support|=8; break; }
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119 support|=strtol(s,NULL,16);
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124 // auto detection order override
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125 if (PicoAutoRgnOrder) {
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126 if (((PicoAutoRgnOrder>>0)&0xf) & support) support = (PicoAutoRgnOrder>>0)&0xf;
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127 else if (((PicoAutoRgnOrder>>4)&0xf) & support) support = (PicoAutoRgnOrder>>4)&0xf;
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128 else if (((PicoAutoRgnOrder>>8)&0xf) & support) support = (PicoAutoRgnOrder>>8)&0xf;
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131 // Try to pick the best hardware value for English/50hz:
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132 if (support&8) { hw=0xc0; pal=1; } // Europe
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133 else if (support&4) hw=0x80; // USA
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134 else if (support&2) { hw=0x40; pal=1; } // Japan PAL
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135 else if (support&1) hw=0x00; // Japan NTSC
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136 else hw=0x80; // USA
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138 Pico.m.hardware=(unsigned char)(hw|0x20); // No disk attached
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140 Pico.video.status = 0x3408 | pal; // always set bits | vblank | pal
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142 PsndReset(); // pal must be known here
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144 if (PicoResetHook) PicoResetHook();
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147 PicoResetMCD(hard);
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151 // reset sram state; enable sram access by default if it doesn't overlap with ROM
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152 Pico.m.sram_reg=sram_reg&0x14;
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153 if (!(Pico.m.sram_reg&4) && Pico.romsize <= SRam.start) Pico.m.sram_reg |= 1;
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155 elprintf(EL_STATUS, "sram: det: %i; eeprom: %i; start: %06x; end: %06x",
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156 (Pico.m.sram_reg>>4)&1, (Pico.m.sram_reg>>2)&1, SRam.start, SRam.end);
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162 // dma2vram settings are just hacks to unglitch Legend of Galahad (needs <= 104 to work)
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163 // same for Outrunners (92-121, when active is set to 24)
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164 static const int dma_timings[] = {
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165 83, 167, 166, 83, // vblank: 32cell: dma2vram dma2[vs|c]ram vram_fill vram_copy
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166 102, 205, 204, 102, // vblank: 40cell:
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167 16, 16, 15, 8, // active: 32cell:
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168 24, 18, 17, 9 // ...
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171 static const int dma_bsycles[] = {
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172 (488<<8)/82, (488<<8)/167, (488<<8)/166, (488<<8)/83,
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173 (488<<8)/102, (488<<8)/205, (488<<8)/204, (488<<8)/102,
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174 (488<<8)/16, (488<<8)/16, (488<<8)/15, (488<<8)/8,
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175 (488<<8)/24, (488<<8)/18, (488<<8)/17, (488<<8)/9
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178 PICO_INTERNAL int CheckDMA(void)
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180 int burn = 0, xfers_can, dma_op = Pico.video.reg[0x17]>>6; // see gens for 00 and 01 modes
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181 int xfers = Pico.m.dma_xfers;
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184 if(!(dma_op&2)) dma_op = (Pico.video.type==1) ? 0 : 1; // setting dma_timings offset here according to Gens
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186 if(Pico.video.reg[12] & 1) dma_op |= 4; // 40 cell mode?
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187 if(!(Pico.video.status&8)&&(Pico.video.reg[1]&0x40)) dma_op|=8; // active display?
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188 xfers_can = dma_timings[dma_op];
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189 if(xfers <= xfers_can) {
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190 if(dma_op&2) Pico.video.status&=~2; // dma no longer busy
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192 burn = xfers * dma_bsycles[dma_op] >> 8; // have to be approximate because can't afford division..
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194 Pico.m.dma_xfers = 0;
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196 if(!(dma_op&2)) burn = 488;
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197 Pico.m.dma_xfers -= xfers_can;
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200 elprintf(EL_VDPDMA, "~Dma %i op=%i can=%i burn=%i [%i]", Pico.m.dma_xfers, dma_op1, xfers_can, burn, SekCyclesDone());
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201 //dprintf("~aim: %i, cnt: %i", SekCycleAim, SekCycleCnt);
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205 static __inline void SekRunM68k(int cyc)
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209 if((cyc_do=SekCycleAim-SekCycleCnt) <= 0) return;
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210 #if defined(EMU_CORE_DEBUG)
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211 // this means we do run-compare
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212 SekCycleCnt+=CM_compareRun(cyc_do, 0);
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213 #elif defined(EMU_C68K)
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214 PicoCpuCM68k.cycles=cyc_do;
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215 CycloneRun(&PicoCpuCM68k);
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216 SekCycleCnt+=cyc_do-PicoCpuCM68k.cycles;
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217 #elif defined(EMU_M68K)
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218 SekCycleCnt+=m68k_execute(cyc_do);
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219 #elif defined(EMU_F68K)
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220 SekCycleCnt+=fm68k_emulate(cyc_do+1, 0);
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224 static __inline void SekStep(void)
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226 // this is required for timing sensitive stuff to work
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227 int realaim=SekCycleAim; SekCycleAim=SekCycleCnt+1;
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228 #if defined(EMU_CORE_DEBUG)
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229 SekCycleCnt+=CM_compareRun(1, 0);
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230 #elif defined(EMU_C68K)
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231 PicoCpuCM68k.cycles=1;
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232 CycloneRun(&PicoCpuCM68k);
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233 SekCycleCnt+=1-PicoCpuCM68k.cycles;
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234 #elif defined(EMU_M68K)
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235 SekCycleCnt+=m68k_execute(1);
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236 #elif defined(EMU_F68K)
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237 SekCycleCnt+=fm68k_emulate(1, 0);
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239 SekCycleAim=realaim;
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242 static int CheckIdle(void)
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244 int i, state[0x22];
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246 // See if the state is the same after 2 steps:
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247 SekState(state); SekStep(); SekStep(); SekState(state+0x11);
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248 for (i = 0x10; i >= 0; i--)
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249 if (state[i] != state[i+0x11]) return 0;
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255 // to be called on 224 or line_sample scanlines only
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256 static __inline void getSamples(int y)
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258 static int curr_pos = 0;
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262 curr_pos += PsndRender(curr_pos, PsndLen-PsndLen/2);
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263 else curr_pos = PsndRender(0, PsndLen);
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264 if (emustatus&1) emustatus|=2; else emustatus&=~2;
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265 if (PicoWriteSound) PicoWriteSound(curr_pos);
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266 // clear sound buffer
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269 else if(emustatus & 3) {
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272 curr_pos = PsndRender(0, PsndLen/2);
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277 #include "PicoFrameHints.c"
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279 // helper z80 runner. Runs only if z80 is enabled at this point
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280 // (z80WriteBusReq will handle the rest)
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281 static void PicoRunZ80Simple(int line_from, int line_to)
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283 int line_from_r=line_from, line_to_r=line_to, line=0;
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284 int line_sample = Pico.m.pal ? 68 : 93;
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286 if (!(PicoOpt&4) || Pico.m.z80Run == 0) line_to_r = 0;
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288 extern const unsigned short vcounts[];
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289 if (z80startCycle) {
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290 line = vcounts[z80startCycle>>8];
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291 if (line > line_from)
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292 line_from_r = line;
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294 z80startCycle = SekCyclesDone();
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298 // we have ym2612 enabled, so we have to run Z80 in lines, so we could update DAC and timers
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299 for (line = line_from; line < line_to; line++) {
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300 Psnd_timers_and_dac(line);
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301 if ((line == 224 || line == line_sample) && PsndOut) getSamples(line);
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302 if (line == 32 && PsndOut) emustatus &= ~1;
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303 if (line >= line_from_r && line < line_to_r)
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306 } else if (line_to_r-line_from_r > 0) {
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307 z80_run_nr(228*(line_to_r-line_from_r));
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308 // samples will be taken by caller
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312 // Simple frame without H-Ints
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313 static int PicoFrameSimple(void)
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315 struct PicoVideo *pv=&Pico.video;
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316 int y=0,line=0,lines=0,lines_step=0,sects;
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317 int cycles_68k_vblock,cycles_68k_block;
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319 // split to 16 run calls for active scan, for vblank split to 2 (ntsc), 3 (pal 240), 4 (pal 224)
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320 if (Pico.m.pal && (pv->reg[1]&8)) {
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321 if(pv->reg[1]&8) { // 240 lines
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322 cycles_68k_block = 7329; // (488*240+148)/16.0, -4
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323 cycles_68k_vblock = 11640; // (72*488-148-68)/3.0, 0
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326 cycles_68k_block = 6841; // (488*224+148)/16.0, -4
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327 cycles_68k_vblock = 10682; // (88*488-148-68)/4.0, 0
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331 // M68k cycles/frame: 127840.71
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332 cycles_68k_block = 6841; // (488*224+148)/16.0, -4
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333 cycles_68k_vblock = 9164; // (38*488-148-68)/2.0, 0
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337 // we don't emulate DMA timing in this mode
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338 if (Pico.m.dma_xfers) {
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339 Pico.m.dma_xfers=0;
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340 Pico.video.status&=~2;
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344 pv->lwrite_cnt = 0;
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345 Pico.video.status|=0x200;
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347 Pico.m.scanline=-1;
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352 // 6 button pad: let's just say it timed out now
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353 Pico.m.padTHPhase[0]=Pico.m.padTHPhase[1]=0;
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355 // ---- Active Scan ----
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356 pv->status&=~0x88; // clear V-Int, come out of vblank
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358 // Run in sections:
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359 for(sects=16; sects; sects--)
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361 if (CheckIdle()) break;
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363 lines += lines_step;
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364 SekRunM68k(cycles_68k_block);
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366 PicoRunZ80Simple(line, lines);
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370 // run Z80 for remaining sections
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372 int c = sects*cycles_68k_block;
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374 // this "run" is for approriate line counter, etc
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378 lines += sects*lines_step;
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379 PicoRunZ80Simple(line, lines);
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383 if (!PicoSkipFrame)
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385 if (!(PicoOpt&0x10))
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387 #if CAN_HANDLE_240_LINES
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388 if (pv->reg[1]&8) {
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389 for (y=0;y<240;y++) PicoLine(y);
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391 for (y=0;y<224;y++) PicoLine(y);
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394 for (y=0;y<224;y++) PicoLine(y);
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396 else PicoFrameFull();
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397 #ifdef DRAW_FINISH_FUNC
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398 DRAW_FINISH_FUNC();
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402 // here we render sound if ym2612 is disabled
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403 if (!(PicoOpt&1) && PsndOut) {
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404 int len = PsndRender(0, PsndLen);
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405 if (PicoWriteSound) PicoWriteSound(len);
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406 // clear sound buffer
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410 // a gap between flags set and vint
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411 pv->pending_ints|=0x20;
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412 pv->status|=8; // go into vblank
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415 // ---- V-Blanking period ----
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418 if(pv->reg[1]&8) { // 240 lines
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419 lines = line = 240;
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423 lines = line = 224;
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428 lines = line = 224;
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433 if (pv->reg[1]&0x20) SekInterrupt(6); // Set IRQ
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434 if (Pico.m.z80Run && (PicoOpt&4))
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438 lines += lines_step;
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440 SekRunM68k(cycles_68k_vblock);
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442 PicoRunZ80Simple(line, lines);
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446 if (sects && CheckIdle()) break;
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449 // run Z80 for remaining sections
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451 lines += sects*lines_step;
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452 PicoRunZ80Simple(line, lines);
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458 int PicoFrame(void)
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462 Pico.m.frame_count++;
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469 // be accurate if we are asked for this
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470 if(PicoOpt&0x40) acc=1;
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471 // don't be accurate in alternative render mode, as hint effects will not be rendered anyway
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472 else if(PicoOpt&0x10) acc = 0;
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473 else acc=Pico.video.reg[0]&0x10; // be accurate if hints are used
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475 //if(Pico.video.reg[12]&0x2) Pico.video.status ^= 0x10; // change odd bit in interlace mode
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477 if(!(PicoOpt&0x10))
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482 else PicoFrameSimple();
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487 void PicoFrameDrawOnly(void)
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491 for (y=0;y<224;y++) PicoLine(y);
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494 // callback to output message from emu
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495 void (*PicoMessage)(const char *msg)=NULL;
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497 #if 1 // defined(__DEBUG_PRINT)
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498 // tmp debug: dump some stuff
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499 #define bit(r, x) ((r>>x)&1)
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500 void z80_debug(char *dstr);
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501 char *debugString(void)
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504 static char dstr[1024];
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505 struct PicoVideo *pv=&Pico.video;
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506 unsigned char *reg=pv->reg, r;
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510 sprintf(dstrp, "mode set 1: %02x\n", (r=reg[0])); dstrp+=strlen(dstrp);
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511 sprintf(dstrp, "display_disable: %i, M3: %i, palette: %i, ?, hints: %i\n", bit(r,0), bit(r,1), bit(r,2), bit(r,4));
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512 dstrp+=strlen(dstrp);
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513 sprintf(dstrp, "mode set 2: %02x\n", (r=reg[1])); dstrp+=strlen(dstrp);
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514 sprintf(dstrp, "SMS/gen: %i, pal: %i, dma: %i, vints: %i, disp: %i, TMS: %i\n", bit(r,2), bit(r,3), bit(r,4),
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515 bit(r,5), bit(r,6), bit(r,7)); dstrp+=strlen(dstrp);
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516 sprintf(dstrp, "mode set 3: %02x\n", (r=reg[0xB])); dstrp+=strlen(dstrp);
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517 sprintf(dstrp, "LSCR: %i, HSCR: %i, 2cell vscroll: %i, IE2: %i\n", bit(r,0), bit(r,1), bit(r,2), bit(r,3)); dstrp+=strlen(dstrp);
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518 sprintf(dstrp, "mode set 4: %02x\n", (r=reg[0xC])); dstrp+=strlen(dstrp);
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519 sprintf(dstrp, "interlace: %i%i, cells: %i, shadow: %i\n", bit(r,2), bit(r,1), (r&0x80) ? 40 : 32, bit(r,3));
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520 dstrp+=strlen(dstrp);
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521 sprintf(dstrp, "scroll size: w: %i, h: %i SRAM: %i; eeprom: %i (%i)\n", reg[0x10]&3, (reg[0x10]&0x30)>>4,
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522 bit(Pico.m.sram_reg, 4), bit(Pico.m.sram_reg, 2), SRam.eeprom_type); dstrp+=strlen(dstrp);
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523 sprintf(dstrp, "sram range: %06x-%06x, reg: %02x\n", SRam.start, SRam.end, Pico.m.sram_reg); dstrp+=strlen(dstrp);
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524 sprintf(dstrp, "pend int: v:%i, h:%i, vdp status: %04x\n", bit(pv->pending_ints,5), bit(pv->pending_ints,4), pv->status);
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525 dstrp+=strlen(dstrp);
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526 #if defined(EMU_C68K)
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527 sprintf(dstrp, "M68k: PC: %06x, st_flg: %x, cycles: %u\n", SekPc, PicoCpuCM68k.state_flags, SekCyclesDoneT());
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528 dstrp+=strlen(dstrp);
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529 sprintf(dstrp, "d0=%08x, a0=%08x, osp=%08x, irql=%i\n", PicoCpuCM68k.d[0], PicoCpuCM68k.a[0], PicoCpuCM68k.osp, PicoCpuCM68k.irq); dstrp+=strlen(dstrp);
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530 sprintf(dstrp, "d1=%08x, a1=%08x, sr=%04x\n", PicoCpuCM68k.d[1], PicoCpuCM68k.a[1], CycloneGetSr(&PicoCpuCM68k)); dstrp+=strlen(dstrp);
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531 for(r=2; r < 8; r++) {
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532 sprintf(dstrp, "d%i=%08x, a%i=%08x\n", r, PicoCpuCM68k.d[r], r, PicoCpuCM68k.a[r]); dstrp+=strlen(dstrp);
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534 #elif defined(EMU_M68K)
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535 sprintf(dstrp, "M68k: PC: %06x, cycles: %u, irql: %i\n", SekPc, SekCyclesDoneT(), PicoCpuMM68k.int_level>>8); dstrp+=strlen(dstrp);
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536 #elif defined(EMU_F68K)
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537 sprintf(dstrp, "M68k: PC: %06x, cycles: %u, irql: %i\n", SekPc, SekCyclesDoneT(), PicoCpuFM68k.interrupts[0]); dstrp+=strlen(dstrp);
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539 sprintf(dstrp, "z80Run: %i, pal: %i, frame#: %i\n", Pico.m.z80Run, Pico.m.pal, Pico.m.frame_count); dstrp+=strlen(dstrp);
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540 z80_debug(dstrp); dstrp+=strlen(dstrp);
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541 if (strlen(dstr) > sizeof(dstr))
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542 printf("warning: debug buffer overflow (%i/%i)\n", strlen(dstr), sizeof(dstr));
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545 struct PicoVideo *pvid=&Pico.video;
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548 static char dstr[1024*8];
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551 table=pvid->reg[5]&0x7f;
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552 if (pvid->reg[12]&1) table&=0x7e; // Lowest bit 0 in 40-cell mode
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553 table<<=8; // Get sprite table address/2
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555 for (i=u=n=0; u < 80 && n < 20; u++)
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557 unsigned int *sprite;
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558 int code, code2, sx, sy, height;
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560 sprite=(unsigned int *)(Pico.vram+((table+(link<<2))&0x7ffc)); // Find sprite
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565 // check if it is on this line
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566 sy = (code&0x1ff);//-0x80;
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567 height = ((code>>24)&3)+1;
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571 sx = (code2>>16)&0x1ff;
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573 printf("#%02i x: %03i y: %03i %ix%i\n", u, sx, sy, ((code>>26)&3)+1, height);
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575 link=(code>>16)&0x7f;
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576 if(!link) break; // End of sprites
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582 FILE *f = fopen("zram", "wb");
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583 fwrite(Pico.zram, 1, 0x2000, f);
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