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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12 extern const unsigned char hcounts_32[];
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13 extern const unsigned char hcounts_40[];
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14 extern const unsigned short vcounts[];
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15 extern int rendstatus;
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17 typedef unsigned short u16;
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20 static __inline void AutoIncrement()
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22 Pico.video.addr=(unsigned short)(Pico.video.addr+Pico.video.reg[0xf]);
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25 static void VideoWrite(u16 d)
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27 unsigned int a=Pico.video.addr;
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29 switch (Pico.video.type)
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31 case 1: if(a&1) d=(u16)((d<<8)|(d>>8)); // If address is odd, bytes are swapped (which game needs this?)
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32 Pico.vram [(a>>1)&0x7fff]=d;
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33 rendstatus|=0x10; break;
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34 case 3: Pico.m.dirtyPal = 1;
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35 //dprintf("w[%i] @ %04x, inc=%i [%i|%i]", Pico.video.type, a, Pico.video.reg[0xf], Pico.m.scanline, SekCyclesDone());
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36 Pico.cram [(a>>1)&0x003f]=d; break; // wraps (Desert Strike)
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37 case 5: Pico.vsram[(a>>1)&0x003f]=d; break;
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40 //dprintf("w[%i] @ %04x, inc=%i [%i|%i]", Pico.video.type, a, Pico.video.reg[0xf], Pico.m.scanline, SekCyclesDone());
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44 static unsigned int VideoRead()
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46 unsigned int a=0,d=0;
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48 a=Pico.video.addr; a>>=1;
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50 switch (Pico.video.type)
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52 case 0: d=Pico.vram [a&0x7fff]; break;
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53 case 8: d=Pico.cram [a&0x003f]; break;
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54 case 4: d=Pico.vsram[a&0x003f]; break;
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61 // calculate the number of cycles 68k->VDP dma operation would take
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62 static int DmaSlowBurn(int len)
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64 // test: Legend of Galahad, Time Killers
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65 int burn,maxlen,line=Pico.m.scanline;
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67 if(line == -1) line=vcounts[SekCyclesDone()>>8];
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68 maxlen=(224-line)*18;
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70 burn = len*(((488<<8)/18))>>8;
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72 burn = maxlen*(((488<<8)/18))>>8;
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73 burn += (len-maxlen)*(((488<<8)/180))>>8;
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79 static int GetDmaLength()
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81 struct PicoVideo *pvid=&Pico.video;
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83 // 16-bit words to transfer:
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84 len =pvid->reg[0x13];
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85 len|=pvid->reg[0x14]<<8;
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86 // Charles MacDonald:
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87 if(!len) len = 0xffff;
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91 static void DmaSlow(int len)
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93 u16 *pd=0, *pdend, *r;
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94 unsigned int a=Pico.video.addr, a2, d;
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95 unsigned char inc=Pico.video.reg[0xf];
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96 unsigned int source, burn;
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98 source =Pico.video.reg[0x15]<<1;
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99 source|=Pico.video.reg[0x16]<<9;
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100 source|=Pico.video.reg[0x17]<<17;
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102 //dprintf("DmaSlow[%i] %06x->%04x len %i inc=%i blank %i [%i|%i]", Pico.video.type, source, a, len, inc,
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103 // (Pico.video.status&8)||!(Pico.video.reg[1]&0x40), Pico.m.scanline, SekCyclesDone());
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105 if ((source&0xe00000)==0xe00000) { pd=(u16 *)(Pico.ram+(source&0xfffe)); pdend=(u16 *)(Pico.ram+0x10000); } // Ram
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106 else if(source<Pico.romsize) { pd=(u16 *)(Pico.rom+(source&~1)); pdend=(u16 *)(Pico.rom+Pico.romsize); } // Rom
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107 else return; // Invalid source address
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109 // CPU is stopped during DMA, so we burn some cycles to compensate that
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110 if((Pico.video.status&8)||!(Pico.video.reg[1]&0x40)) { // vblank?
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111 burn = (len*(((488<<8)/167))>>8); // very approximate
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112 if(!(Pico.video.status&8)) burn+=burn>>1; // a hack for Legend of Galahad
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113 } else burn = DmaSlowBurn(len);
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114 SekCyclesBurn(burn);
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115 if(!(Pico.video.status&8))
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117 //dprintf("DmaSlow burn: %i @ %06x", burn, SekPc);
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119 switch (Pico.video.type)
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126 if(a&1) d=(d<<8)|(d>>8);
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127 r[a>>1] = (u16)d; // will drop the upper bits
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130 // didn't src overlap?
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131 if(pd >= pdend) pd-=0x8000; // should be good for RAM, bad for ROM
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137 //dprintf("DmaSlow[%i] %06x->%04x len %i inc=%i blank %i [%i|%i]", Pico.video.type, source, a, len, inc,
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138 // (Pico.video.status&8)||!(Pico.video.reg[1]&0x40), Pico.m.scanline, SekCyclesDone());
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139 Pico.m.dirtyPal = 1;
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141 for(a2=a&0x7f; len; len--)
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143 r[a2>>1] = (u16)*pd++;; // bit 0 is ignored
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146 // didn't src overlap?
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147 if(pd >= pdend) pd-=0x8000;
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149 if(a2 >= 0x80) break; // Todds Adventures in Slime World / Andre Agassi tennis
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154 case 5: // vsram[a&0x003f]=d;
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156 for(a2=a&0x7f; len; len--)
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158 r[a2>>1] = (u16)*pd++;
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161 // didn't src overlap?
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162 if(pd >= pdend) pd-=0x8000;
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164 if(a2 >= 0x80) break;
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170 Pico.video.addr=(u16)a;
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173 static void DmaCopy(int len)
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175 u16 a=Pico.video.addr;
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176 unsigned char *vr = (unsigned char *) Pico.vram;
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177 unsigned char *vrs;
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178 unsigned char inc=Pico.video.reg[0xf];
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180 //dprintf("DmaCopy len %i [%i|%i]", len, Pico.m.scanline, SekCyclesDone());
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182 source =Pico.video.reg[0x15];
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183 source|=Pico.video.reg[0x16]<<8;
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186 if(source+len > 0x10000) len=0x10000-source; // clip??
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199 // check: Contra, Megaman
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200 // note: this is still inaccurate
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201 static void DmaFill(int data)
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204 unsigned short a=Pico.video.addr;
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205 unsigned char *vr=(unsigned char *) Pico.vram;
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206 unsigned char high = (unsigned char) (data >> 8);
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207 unsigned char inc=Pico.video.reg[0xf];
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209 len=GetDmaLength();
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210 //dprintf("DmaFill len %i inc %i [%i|%i]", len, inc, Pico.m.scanline, SekCyclesDone());
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212 // from Charles MacDonald's genvdp.txt:
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213 // Write lower byte to address specified
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214 vr[a] = (unsigned char) data;
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220 // Write upper byte to adjacent address
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221 // (here we are byteswapped, so address is already 'adjacent')
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224 // Increment address register
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230 Pico.video.reg[0x13] = Pico.video.reg[0x14] = 0; // Dino Dini's Soccer (E) (by Haze)
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235 static void CommandDma()
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237 struct PicoVideo *pvid=&Pico.video;
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238 int len=0,method=0;
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240 if ((pvid->reg[1]&0x10)==0) return; // DMA not enabled
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242 len=GetDmaLength();
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244 method=pvid->reg[0x17]>>6;
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245 if (method< 2) DmaSlow(len); // 68000 to VDP
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246 if (method==3) DmaCopy(len); // VRAM Copy
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249 static void CommandChange()
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251 struct PicoVideo *pvid=&Pico.video;
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252 unsigned int cmd=0,addr=0;
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256 // Get type of transfer 0xc0000030 (v/c/vsram read/write)
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257 pvid->type=(unsigned char)(((cmd>>2)&0xc)|(cmd>>30));
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259 // Get address 0x3fff0003
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260 addr =(cmd>>16)&0x3fff;
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261 addr|=(cmd<<14)&0xc000;
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262 pvid->addr=(unsigned short)addr;
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263 //dprintf("addr set: %04x", addr);
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266 if (cmd&0x80) CommandDma();
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269 void PicoVideoWrite(unsigned int a,unsigned short d)
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271 struct PicoVideo *pvid=&Pico.video;
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275 if (a==0x00) // Data port 0 or 2
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277 if (pvid->pending) CommandChange();
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280 // If a DMA fill has been set up, do it
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281 if ((pvid->command&0x80) && (pvid->reg[1]&0x10) && (pvid->reg[0x17]>>6)==2)
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292 if (a==0x04) // Control (command) port 4 or 6
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294 //dprintf("vdp cw(%04x), p=%i @ %06x [%i]", d, pvid->pending, SekPc, SekCyclesDone());
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297 // Low word of command:
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298 pvid->command&=0xffff0000;
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303 if((d&0xc000)==0x8000)
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306 int num=(d>>8)&0x1f;
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307 //if(num==00) dprintf("hint_onoff: %i->%i [%i|%i] pend=%i @ %06x", (pvid->reg[0]&0x10)>>4, (d&0x10)>>4, Pico.m.scanline, SekCyclesDone(), (pvid->pending_ints&0x10)>>4, SekPc);
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308 //if(num==01) dprintf("vint_onoff: %i->%i [%i|%i] pend=%i @ %06x", (pvid->reg[1]&0x20)>>5, (d&0x20)>>5, Pico.m.scanline, SekCyclesDone(), (pvid->pending_ints&0x20)>>5, SekPc);
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309 //if(num==01) dprintf("set_blank: %i @ %06x [%i|%i]", !((d&0x40)>>6), SekPc, Pico.m.scanline, SekCyclesDone());
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310 //if(num==05) dprintf("spr_set: %i @ %06x [%i|%i]", (unsigned char)d, SekPc, Pico.m.scanline, SekCyclesDone());
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311 //if(num==10) dprintf("hint_set: %i @ %06x [%i|%i]", (unsigned char)d, SekPc, Pico.m.scanline, SekCyclesDone());
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312 pvid->reg[num]=(unsigned char)d;
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313 #if !(defined(EMU_C68K) && defined(EMU_M68K)) // not debugging Cyclone
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314 // update IRQ level (Lemmings, Wiz 'n' Liz intro, ... )
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315 // may break if done improperly:
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316 // International Superstar Soccer Deluxe (crash), Street Racer (logos), Burning Force (gfx), Fatal Rewind (hang), Sesame Street Counting Cafe
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319 // hack: make sure we do not touch the irq line if Cyclone is just about to take the IRQ
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320 if (PicoCpu.irq <= (PicoCpu.srh&7)) {
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323 lines = (pvid->reg[1] & 0x20) | (pvid->reg[0] & 0x10);
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324 pints = (pvid->pending_ints&lines);
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325 if(pints & 0x20) SekInterrupt(6);
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326 else if(pints & 0x10) SekInterrupt(4);
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327 else SekInterrupt(0);
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329 // adjust cycles for Cyclone so it would take the int "in time"
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338 if(num == 5) rendstatus|=1;
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339 else if(num == 0xc) Pico.m.dirtyPal = 2; // renderers should update their palettes if sh/hi mode is changed
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340 pvid->type=0; // register writes clear command (else no Sega logo in Golden Axe II)
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342 // High word of command:
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343 pvid->command&=0x0000ffff;
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344 pvid->command|=d<<16;
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351 unsigned int PicoVideoRead(unsigned int a)
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357 if (a==0x00) // data port
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363 if (a==0x04) // control port
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365 //dprintf("sr_read @ %06x [%i|%i]", SekPc, Pico.m.scanline, SekCyclesDone());
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366 d=Pico.video.status;
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367 if(PicoOpt&0x10) d|=0x0020; // sprite collision (Shadow of the Beast)
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368 if(Pico.m.rotate++&8) d|=0x0100; else d|=0x0200; // Toggle fifo full empty (who uses that stuff?)
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369 if(!(Pico.video.reg[1]&0x40)) d|=0x0008; // set V-Blank if display is disabled
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370 if(SekCyclesLeft < 84+4) d|=0x0004; // H-Blank (Sonic3 vs)
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372 Pico.video.pending=0; // ctrl port reads clear write-pending flag (Charles MacDonald)
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377 // H-counter info (based on Generator):
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379 // | <- hblank? -> |
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380 // start <416> hint <36> hdisplay <38> end // CPU cycles
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381 // |---------...---------|------------|-------------|
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382 // 0 B6 E4 FF // 40 cells
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383 // 0 93 E8 FF // 32 cells
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385 // Gens (?) v-render
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386 // start <hblank=84> hint hdisplay <404> |
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387 // |---------------------|--------------------------|
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388 // E4 (hc[0x43]==0) 07 B1 // 40
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389 // E8 (hc[0x45]==0) 05 91 // 32
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391 // check: Sonic 3D Blast bonus, Cannon Fodder, Chase HQ II, 3 Ninjas kick back, Road Rash 3, Skitchin', Wheel of Fortune
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392 if ((a&0x1c)==0x08)
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396 if(Pico.m.scanline != -1) {
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397 int lineCycles=(488-SekCyclesLeft)&0x1ff;
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398 d=Pico.m.scanline; // V-Counter
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400 if(Pico.video.reg[12]&1)
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401 hc=hcounts_40[lineCycles];
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402 else hc=hcounts_32[lineCycles];
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404 if(lineCycles > 488-12) d++; // Wheel of Fortune
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406 // get approximate V-Counter
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407 d=vcounts[SekCyclesDone()>>8];
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408 hc = Pico.m.rotate&0xff;
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412 if(d >= 0x103) d-=56; // based on Gens
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414 if(d >= 0xEB) d-=6;
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417 if((Pico.video.reg[12]&6) == 6) {
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418 // interlace mode 2 (Combat Cars (UE) [!])
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420 if (d&0xf00) d|= 1;
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423 //dprintf("hv: %02x %02x (%i) @ %06x", hc, d, SekCyclesDone(), SekPc);
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