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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20 void (*PicoWriteSound)(int len) = 0; // called once per frame at the best time to send sound buffer (PsndOut) to hardware
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22 struct PicoSRAM SRam = {0,};
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23 int z80startCycle, z80stopCycle; // 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: scd_started, reset_pending
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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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46 // to be called once on emu exit
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53 if(SRam.data) free(SRam.data); SRam.data=0;
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56 int PicoReset(int hard)
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58 unsigned int region=0;
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59 int support=0,hw=0,i=0;
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60 unsigned char pal=0;
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61 unsigned char sram_reg=Pico.m.sram_reg; // must be preserved
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63 if (Pico.romsize<=0) return 1;
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67 // 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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68 SekSetRealTAS(PicoMCD & 1);
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72 // reset VDP state, VRAM and PicoMisc
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73 //memset(&Pico.video,0,sizeof(Pico.video));
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74 //memset(&Pico.vram,0,sizeof(Pico.vram));
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75 memset(Pico.ioports,0,sizeof(Pico.ioports)); // needed for MCD to reset properly
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76 memset(&Pico.m,0,sizeof(Pico.m));
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77 Pico.video.pending_ints=0;
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81 // clear all memory of the emulated machine
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82 memset(&Pico.ram,0,(unsigned int)&Pico.rom-(unsigned int)&Pico.ram);
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85 // default VDP register values (based on Fusion)
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86 Pico.video.reg[0] = Pico.video.reg[1] = 0x04;
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87 Pico.video.reg[0xc] = 0x81;
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88 Pico.video.reg[0xf] = 0x02;
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89 Pico.m.dirtyPal = 1;
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91 if(PicoRegionOverride)
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93 support = PicoRegionOverride;
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97 // Read cartridge region data:
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98 region=PicoRead32(0x1f0);
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104 c=region>>(i<<3); c&=0xff;
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105 if (c<=' ') continue;
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107 if (c=='J') support|=1;
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108 else if (c=='U') support|=4;
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109 else if (c=='E') support|=8;
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110 else if (c=='j') {support|=1; break; }
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111 else if (c=='u') {support|=4; break; }
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112 else if (c=='e') {support|=8; break; }
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118 support|=strtol(s,NULL,16);
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123 // auto detection order override
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124 if (PicoAutoRgnOrder) {
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125 if (((PicoAutoRgnOrder>>0)&0xf) & support) support = (PicoAutoRgnOrder>>0)&0xf;
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126 else if (((PicoAutoRgnOrder>>4)&0xf) & support) support = (PicoAutoRgnOrder>>4)&0xf;
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127 else if (((PicoAutoRgnOrder>>8)&0xf) & support) support = (PicoAutoRgnOrder>>8)&0xf;
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130 // Try to pick the best hardware value for English/50hz:
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131 if (support&8) { hw=0xc0; pal=1; } // Europe
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132 else if (support&4) hw=0x80; // USA
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133 else if (support&2) { hw=0x40; pal=1; } // Japan PAL
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134 else if (support&1) hw=0x00; // Japan NTSC
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135 else hw=0x80; // USA
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137 Pico.m.hardware=(unsigned char)(hw|0x20); // No disk attached
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139 Pico.video.status = 0x3408 | pal; // always set bits | vblank | pal
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141 sound_reset(); // pal must be known here
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144 PicoResetMCD(hard);
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148 // reset sram state; enable sram access by default if it doesn't overlap with ROM
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149 Pico.m.sram_reg=sram_reg&0x14;
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150 if (!(Pico.m.sram_reg&4) && Pico.romsize <= SRam.start) Pico.m.sram_reg |= 1;
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152 elprintf(EL_STATUS, "sram: det: %i; eeprom: %i; start: %06x; end: %06x",
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153 (Pico.m.sram_reg>>4)&1, (Pico.m.sram_reg>>2)&1, SRam.start, SRam.end);
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159 // dma2vram settings are just hacks to unglitch Legend of Galahad (needs <= 104 to work)
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160 // same for Outrunners (92-121, when active is set to 24)
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161 static const int dma_timings[] = {
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162 83, 167, 166, 83, // vblank: 32cell: dma2vram dma2[vs|c]ram vram_fill vram_copy
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163 102, 205, 204, 102, // vblank: 40cell:
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164 16, 16, 15, 8, // active: 32cell:
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165 24, 18, 17, 9 // ...
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168 static const int dma_bsycles[] = {
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169 (488<<8)/82, (488<<8)/167, (488<<8)/166, (488<<8)/83,
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170 (488<<8)/102, (488<<8)/205, (488<<8)/204, (488<<8)/102,
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171 (488<<8)/16, (488<<8)/16, (488<<8)/15, (488<<8)/8,
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172 (488<<8)/24, (488<<8)/18, (488<<8)/17, (488<<8)/9
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175 PICO_INTERNAL int CheckDMA(void)
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177 int burn = 0, xfers_can, dma_op = Pico.video.reg[0x17]>>6; // see gens for 00 and 01 modes
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178 int xfers = Pico.m.dma_xfers;
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181 if(!(dma_op&2)) dma_op = (Pico.video.type==1) ? 0 : 1; // setting dma_timings offset here according to Gens
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183 if(Pico.video.reg[12] & 1) dma_op |= 4; // 40 cell mode?
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184 if(!(Pico.video.status&8)&&(Pico.video.reg[1]&0x40)) dma_op|=8; // active display?
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185 xfers_can = dma_timings[dma_op];
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186 if(xfers <= xfers_can) {
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187 if(dma_op&2) Pico.video.status&=~2; // dma no longer busy
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189 burn = xfers * dma_bsycles[dma_op] >> 8; // have to be approximate because can't afford division..
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191 Pico.m.dma_xfers = 0;
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193 if(!(dma_op&2)) burn = 488;
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194 Pico.m.dma_xfers -= xfers_can;
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197 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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198 //dprintf("~aim: %i, cnt: %i", SekCycleAim, SekCycleCnt);
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202 static __inline void SekRunM68k(int cyc)
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206 //printf("aim: %i, cnt: %i\n", SekCycleAim, SekCycleCnt);
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207 if((cyc_do=SekCycleAim-SekCycleCnt) <= 0) return;
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208 //printf("cyc_do: %i\n", cyc_do);
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209 #if defined(EMU_C68K) && defined(EMU_M68K)
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210 // this means we do run-compare Cyclone vs Musashi
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211 SekCycleCnt+=CM_compareRun(cyc_do);
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212 #elif defined(EMU_C68K)
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213 PicoCpu.cycles=cyc_do;
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214 CycloneRun(&PicoCpu);
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215 SekCycleCnt+=cyc_do-PicoCpu.cycles;
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216 #elif defined(EMU_A68K)
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217 m68k_ICount=cyc_do;
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219 SekCycleCnt+=cyc_do-m68k_ICount;
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220 #elif defined(EMU_M68K)
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221 SekCycleCnt+=m68k_execute(cyc_do);
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225 static __inline void SekStep(void)
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227 // this is required for timing sensitive stuff to work
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228 int realaim=SekCycleAim; SekCycleAim=SekCycleCnt+1;
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229 #if defined(EMU_C68K) && defined(EMU_M68K)
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230 // this means we do run-compare Cyclone vs Musashi
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231 SekCycleCnt+=CM_compareRun(1);
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232 #elif defined(EMU_C68K)
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234 CycloneRun(&PicoCpu);
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235 SekCycleCnt+=1-PicoCpu.cycles;
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236 #elif defined(EMU_A68K)
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239 SekCycleCnt+=1-m68k_ICount;
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240 #elif defined(EMU_M68K)
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241 SekCycleCnt+=m68k_execute(1);
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243 SekCycleAim=realaim;
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246 static int CheckIdle(void)
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249 unsigned char state[0x88];
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251 memset(state,0,sizeof(state));
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253 // See if the state is the same after 2 steps:
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254 SekState(state); SekStep(); SekStep(); SekState(state+0x44);
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255 if (memcmp(state,state+0x44,0x44)==0) return 1;
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257 unsigned char state[0x44];
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258 static unsigned char oldstate[0x44];
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261 if(memcmp(state,oldstate,0x40)==0) return 1;
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262 memcpy(oldstate, state, 0x40);
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268 // to be called on 224 or line_sample scanlines only
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269 static __inline void getSamples(int y)
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271 static int curr_pos = 0;
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275 curr_pos += sound_render(curr_pos, PsndLen-PsndLen/2);
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276 else curr_pos = sound_render(0, PsndLen);
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277 if (emustatus&1) emustatus|=2; else emustatus&=~2;
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278 if (PicoWriteSound) PicoWriteSound(curr_pos);
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279 // clear sound buffer
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282 else if(emustatus & 3) {
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285 curr_pos = sound_render(0, PsndLen/2);
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291 int vint_delay = 205/*68*/, as_delay = 18/*148*/;
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293 // Accurate but slower frame which does hints
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294 static int PicoFrameHints(void)
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296 struct PicoVideo *pv=&Pico.video;
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297 int total_z80=0,lines,y,lines_vis = 224,z80CycleAim = 0,line_sample;
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298 const int cycles_68k=488,cycles_z80=228; // both PAL and NTSC compile to same values
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299 int skip=PicoSkipFrame || (PicoOpt&0x10);
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300 int hint; // Hint counter
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302 if(Pico.m.pal) { //
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303 //cycles_68k = (int) ((double) OSC_PAL / 7 / 50 / 312 + 0.4); // should compile to a constant (488)
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304 //cycles_z80 = (int) ((double) OSC_PAL / 15 / 50 / 312 + 0.4); // 228
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305 lines = 312; // Steve Snake says there are 313 lines, but this seems to also work well
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307 if(pv->reg[1]&8) lines_vis = 240;
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309 //cycles_68k = (int) ((double) OSC_NTSC / 7 / 60 / 262 + 0.4); // 488
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310 //cycles_z80 = (int) ((double) OSC_NTSC / 15 / 60 / 262 + 0.4); // 228
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316 //z80ExtraCycles = 0;
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320 // z80_resetCycles();
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322 pv->status&=~0x88; // clear V-Int, come out of vblank
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324 hint=pv->reg[10]; // Load H-Int counter
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325 //dprintf("-hint: %i", hint);
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327 //SekRun(as_delay);
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330 for (y=0;y<lines;y++)
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332 Pico.m.scanline=(short)y;
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335 pv->lwrite_cnt -= 12;
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336 if (pv->lwrite_cnt < 0) pv->lwrite_cnt=0;
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337 if (pv->lwrite_cnt == 0)
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338 Pico.video.status|=0x200;
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340 // pad delay (for 6 button pads)
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342 if(Pico.m.padDelay[0]++ > 25) Pico.m.padTHPhase[0]=0;
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343 if(Pico.m.padDelay[1]++ > 25) Pico.m.padTHPhase[1]=0;
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347 if(y <= lines_vis && --hint < 0) // y <= lines_vis: Comix Zone, Golden Axe
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349 //dprintf("rhint:old @ %06x", SekPc);
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350 hint=pv->reg[10]; // Reload H-Int counter
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351 pv->pending_ints|=0x10;
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352 if (pv->reg[0]&0x10) {
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353 elprintf(EL_INTS, "hint: @ %06x [%i]", SekPc, SekCycleCnt);
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356 //dprintf("hint_routine: %x", (*(unsigned short*)(Pico.ram+0x0B84)<<16)|*(unsigned short*)(Pico.ram+0x0B86));
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360 if (y == lines_vis)
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362 pv->status|=0x08; // go into vblank
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363 //pv->status|=0x80; // V-Int happened
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364 //if(!Pico.m.dma_bytes||(Pico.video.reg[0x17]&0x80)) {
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365 // 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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366 SekRun(68); SekCycleAim-=68; // 128; ?
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368 // SekRun(vint_delay); SekCycleAim-=vint_delay; // 128; ?
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369 // SekCycleAim-=as_delay;
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371 pv->pending_ints|=0x20;
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372 if(pv->reg[1]&0x20) {
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373 elprintf(EL_INTS, "vint: @ %06x [%i]", SekPc, SekCycleCnt);
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376 if(Pico.m.z80Run && (PicoOpt&4)) // ?
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378 //dprintf("zint: [%i|%i] zPC=%04x", Pico.m.scanline, SekCyclesDone(), mz80GetRegisterValue(NULL, 0));
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381 // decide if we draw this line
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382 #if CAN_HANDLE_240_LINES
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383 if(!skip && ((!(pv->reg[1]&8) && y<224) || ((pv->reg[1]&8) && y<240)) )
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390 sound_timers_and_dac(y);
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392 // get samples from sound chips
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393 if(y == 32 && PsndOut)
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395 else if((y == 224 || y == line_sample) && PsndOut)
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399 if (Pico.m.dma_xfers) SekCyclesBurn(CheckDMA());
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400 SekRun(cycles_68k);
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401 if ((PicoOpt&4) && Pico.m.z80Run) {
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402 if (Pico.m.z80Run & 2) z80CycleAim+=cycles_z80;
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404 int cnt = SekCyclesDone() - z80startCycle;
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405 cnt = (cnt>>1)-(cnt>>5);
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406 //if (cnt > cycles_z80) printf("FIXME: z80 cycles: %i\n", cnt);
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407 if (cnt > cycles_z80) cnt = cycles_z80;
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408 Pico.m.z80Run |= 2;
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411 total_z80+=z80_run(z80CycleAim-total_z80);
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415 // draw a frame just after vblank in alternative render mode
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416 if(!PicoSkipFrame && (PicoOpt&0x10))
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422 #include "PicoFrameHints.c"
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425 // helper z80 runner
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426 static void PicoRunZ80Simple(int line_from, int line_to)
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428 int line_from_r=line_from, line_to_r=line_to, line = line_from;
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429 int line_sample = Pico.m.pal ? 68 : 93;
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431 if(!(PicoOpt&4) || Pico.m.z80Run == 0) { line_from_r = line_to_r; line_to_r = 0; }
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434 // we have ym2612 enabled, so we have to run Z80 in lines, so we could update DAC and timers
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435 for(; line < line_to; line++) {
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436 sound_timers_and_dac(line);
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437 if((line == 224 || line == line_sample) && PsndOut) getSamples(line);
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438 if(line == 32 && PsndOut) emustatus &= ~1;
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439 if(line >= line_from_r && line < line_to_r)
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442 } else if(line_to_r-line_from_r > 0) {
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443 z80_run(228*(line_to_r-line_from_r));
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444 // samples will be taken by caller
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448 // Simple frame without H-Ints
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449 static int PicoFrameSimple(void)
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451 struct PicoVideo *pv=&Pico.video;
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452 int y=0,line=0,lines=0,lines_step=0,sects;
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453 int cycles_68k_vblock,cycles_68k_block;
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455 // split to 16 run calls for active scan, for vblank split to 2 (ntsc), 3 (pal 240), 4 (pal 224)
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456 if (Pico.m.pal && (pv->reg[1]&8)) { // 240 lines
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457 if(pv->reg[1]&8) { // 240 lines
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458 cycles_68k_block = 7329; // (488*240+148)/16.0, -4
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459 cycles_68k_vblock = 11640; // (72*488-148-68)/3.0, 0
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462 cycles_68k_block = 6841; // (488*224+148)/16.0, -4
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463 cycles_68k_vblock = 10682; // (88*488-148-68)/4.0, 0
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467 // M68k cycles/frame: 127840.71
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468 cycles_68k_block = 6841; // (488*224+148)/16.0, -4
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469 cycles_68k_vblock = 9164; // (38*488-148-68)/2.0, 0
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473 // we don't emulate DMA timing in this mode
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474 if (Pico.m.dma_xfers) {
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475 Pico.m.dma_xfers=0;
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476 Pico.video.status&=~2;
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480 pv->lwrite_cnt = 0;
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481 Pico.video.status|=0x200;
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483 Pico.m.scanline=-1;
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487 // 6 button pad: let's just say it timed out now
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488 Pico.m.padTHPhase[0]=Pico.m.padTHPhase[1]=0;
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490 // ---- Active Scan ----
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491 pv->status&=~0x88; // clear V-Int, come out of vblank
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493 // Run in sections:
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494 for(sects=16; sects; sects--)
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496 if (CheckIdle()) break;
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498 lines += lines_step;
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499 SekRunM68k(cycles_68k_block);
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501 PicoRunZ80Simple(line, lines);
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505 // run Z80 for remaining sections
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507 int c = sects*cycles_68k_block;
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509 lines += sects*lines_step;
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510 PicoRunZ80Simple(line, lines);
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511 // this is for approriate line counter, etc
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516 // here we render sound if ym2612 is disabled
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517 if (!(PicoOpt&1) && PsndOut) {
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518 int len = sound_render(0, PsndLen);
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519 if (PicoWriteSound) PicoWriteSound(len);
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520 // clear sound buffer
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525 if (!PicoSkipFrame)
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527 if (!(PicoOpt&0x10))
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529 #if CAN_HANDLE_240_LINES
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530 if (pv->reg[1]&8) {
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531 for (y=0;y<240;y++) PicoLine(y);
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533 for (y=0;y<224;y++) PicoLine(y);
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536 for (y=0;y<224;y++) PicoLine(y);
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538 else PicoFrameFull();
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541 // a gap between flags set and vint
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542 pv->pending_ints|=0x20;
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543 pv->status|=8; // go into vblank
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546 // ---- V-Blanking period ----
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549 if(pv->reg[1]&8) { // 240 lines
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550 lines = line = 240;
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554 lines = line = 224;
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559 lines = line = 224;
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564 if (pv->reg[1]&0x20) SekInterrupt(6); // Set IRQ
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565 if (Pico.m.z80Run && (PicoOpt&4))
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569 lines += lines_step;
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571 SekRunM68k(cycles_68k_vblock);
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573 PicoRunZ80Simple(line, lines);
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577 if (sects && CheckIdle()) break;
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580 // run Z80 for remaining sections
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582 lines += sects*lines_step;
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583 PicoRunZ80Simple(line, lines);
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589 int PicoFrame(void)
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593 Pico.m.frame_count++;
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600 // be accurate if we are asked for this
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601 if(PicoOpt&0x40) acc=1;
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602 // don't be accurate in alternative render mode, as hint effects will not be rendered anyway
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603 else if(PicoOpt&0x10) acc = 0;
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604 else acc=Pico.video.reg[0]&0x10; // be accurate if hints are used
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606 //if(Pico.video.reg[12]&0x2) Pico.video.status ^= 0x10; // change odd bit in interlace mode
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608 if(!(PicoOpt&0x10))
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613 else PicoFrameSimple();
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618 void PicoFrameDrawOnly(void)
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622 for (y=0;y<224;y++) PicoLine(y);
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625 // callback to output message from emu
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626 void (*PicoMessage)(const char *msg)=NULL;
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628 #if defined(__DEBUG_PRINT) || defined(__GP2X__)
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629 // tmp debug: dump some stuff
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630 #define bit(r, x) ((r>>x)&1)
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631 void z80_debug(char *dstr);
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632 char *debugString(void)
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635 static char dstr[1024];
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636 struct PicoVideo *pv=&Pico.video;
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637 unsigned char *reg=pv->reg, r;
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641 sprintf(dstrp, "mode set 1: %02x\n", (r=reg[0])); dstrp+=strlen(dstrp);
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642 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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643 dstrp+=strlen(dstrp);
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644 sprintf(dstrp, "mode set 2: %02x\n", (r=reg[1])); dstrp+=strlen(dstrp);
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645 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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646 bit(r,5), bit(r,6), bit(r,7)); dstrp+=strlen(dstrp);
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647 sprintf(dstrp, "mode set 3: %02x\n", (r=reg[0xB])); dstrp+=strlen(dstrp);
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648 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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649 sprintf(dstrp, "mode set 4: %02x\n", (r=reg[0xC])); dstrp+=strlen(dstrp);
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650 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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651 dstrp+=strlen(dstrp);
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652 sprintf(dstrp, "scroll size: w: %i, h: %i SRAM: %i; eeprom: %i (%i)\n", reg[0x10]&3, (reg[0x10]&0x30)>>4,
\r
653 bit(Pico.m.sram_reg, 4), bit(Pico.m.sram_reg, 2), SRam.eeprom_type); dstrp+=strlen(dstrp);
\r
654 sprintf(dstrp, "sram range: %06x-%06x, reg: %02x\n", SRam.start, SRam.end, Pico.m.sram_reg); dstrp+=strlen(dstrp);
\r
655 sprintf(dstrp, "pend int: v:%i, h:%i, vdp status: %04x\n", bit(pv->pending_ints,5), bit(pv->pending_ints,4), pv->status);
\r
656 dstrp+=strlen(dstrp);
\r
658 sprintf(dstrp, "M68k: PC: %06x, st_flg: %x, cycles: %u\n", SekPc, PicoCpu.state_flags, SekCyclesDoneT());
\r
659 dstrp+=strlen(dstrp);
\r
660 sprintf(dstrp, "d0=%08x, a0=%08x, osp=%08x, irql=%i\n", PicoCpu.d[0], PicoCpu.a[0], PicoCpu.osp, PicoCpu.irq); dstrp+=strlen(dstrp);
\r
661 sprintf(dstrp, "d1=%08x, a1=%08x, sr=%04x\n", PicoCpu.d[1], PicoCpu.a[1], CycloneGetSr(&PicoCpu)); dstrp+=strlen(dstrp);
\r
662 for(r=2; r < 8; r++) {
\r
663 sprintf(dstrp, "d%i=%08x, a%i=%08x\n", r, PicoCpu.d[r], r, PicoCpu.a[r]); dstrp+=strlen(dstrp);
\r
666 sprintf(dstrp, "z80Run: %i, pal: %i, frame#: %i\n", Pico.m.z80Run, Pico.m.pal, Pico.m.frame_count); dstrp+=strlen(dstrp);
\r
667 z80_debug(dstrp); dstrp+=strlen(dstrp);
\r
668 if (strlen(dstr) > sizeof(dstr))
\r
669 printf("warning: debug buffer overflow (%i/%i)\n", strlen(dstr), sizeof(dstr));
\r
672 struct PicoVideo *pvid=&Pico.video;
\r
675 static char dstr[1024*8];
\r
678 table=pvid->reg[5]&0x7f;
\r
679 if (pvid->reg[12]&1) table&=0x7e; // Lowest bit 0 in 40-cell mode
\r
680 table<<=8; // Get sprite table address/2
\r
682 for (i=u=n=0; u < 80 && n < 20; u++)
\r
684 unsigned int *sprite;
\r
685 int code, code2, sx, sy, height;
\r
687 sprite=(unsigned int *)(Pico.vram+((table+(link<<2))&0x7ffc)); // Find sprite
\r
692 // check if it is on this line
\r
693 sy = (code&0x1ff);//-0x80;
\r
694 height = ((code>>24)&3)+1;
\r
698 sx = (code2>>16)&0x1ff;
\r
700 printf("#%02i x: %03i y: %03i %ix%i\n", u, sx, sy, ((code>>26)&3)+1, height);
\r
702 link=(code>>16)&0x7f;
\r
703 if(!link) break; // End of sprites
\r
709 FILE *f = fopen("zram", "wb");
\r
710 fwrite(Pico.zram, 1, 0x2000, f);
\r