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 2006-2007, Grazvydas "notaz" Ignotas
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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 "cd/gfx_cd.h"
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13 extern const unsigned char hcounts_32[];
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14 extern const unsigned char hcounts_40[];
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15 extern const unsigned short vcounts[];
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16 extern int rendstatus;
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18 #ifndef UTYPES_DEFINED
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19 typedef unsigned char u8;
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20 typedef unsigned short u16;
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21 typedef unsigned int u32;
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22 #define UTYPES_DEFINED
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26 static __inline void AutoIncrement(void)
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28 Pico.video.addr=(unsigned short)(Pico.video.addr+Pico.video.reg[0xf]);
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31 static void VideoWrite(u16 d)
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33 unsigned int a=Pico.video.addr;
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35 switch (Pico.video.type)
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37 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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38 Pico.vram [(a>>1)&0x7fff]=d;
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39 rendstatus|=0x10; break;
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40 case 3: Pico.m.dirtyPal = 1;
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41 Pico.cram [(a>>1)&0x003f]=d; break; // wraps (Desert Strike)
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42 case 5: Pico.vsram[(a>>1)&0x003f]=d; break;
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43 default:elprintf(EL_ANOMALY, "VDP write %04x with bad type %i", d, Pico.video.type); break;
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46 //dprintf("w[%i] @ %04x, inc=%i [%i|%i]", Pico.video.type, a, Pico.video.reg[0xf], Pico.m.scanline, SekCyclesDone());
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50 static unsigned int VideoRead(void)
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52 unsigned int a=0,d=0;
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54 a=Pico.video.addr; a>>=1;
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56 switch (Pico.video.type)
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58 case 0: d=Pico.vram [a&0x7fff]; break;
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59 case 8: d=Pico.cram [a&0x003f]; break;
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60 case 4: d=Pico.vsram[a&0x003f]; break;
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61 default:elprintf(EL_ANOMALY, "VDP read with bad type %i", Pico.video.type); break;
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68 static int GetDmaLength(void)
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70 struct PicoVideo *pvid=&Pico.video;
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72 // 16-bit words to transfer:
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73 len =pvid->reg[0x13];
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74 len|=pvid->reg[0x14]<<8;
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75 // Charles MacDonald:
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76 if(!len) len = 0xffff;
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80 static void DmaSlow(int len)
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82 u16 *pd=0, *pdend, *r;
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83 unsigned int a=Pico.video.addr, a2, d;
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84 unsigned char inc=Pico.video.reg[0xf];
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85 unsigned int source;
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87 source =Pico.video.reg[0x15]<<1;
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88 source|=Pico.video.reg[0x16]<<9;
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89 source|=Pico.video.reg[0x17]<<17;
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91 elprintf(EL_VDPDMA, "DmaSlow[%i] %06x->%04x len %i inc=%i blank %i [%i] @ %06x",
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92 Pico.video.type, source, a, len, inc, (Pico.video.status&8)||!(Pico.video.reg[1]&0x40),
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93 SekCyclesDone(), SekPc);
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95 if(Pico.m.scanline != -1) {
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96 Pico.m.dma_xfers += len;
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97 if ((PicoMCD&1) && (PicoOpt & 0x2000)) SekCyclesBurn(CheckDMA());
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98 else SekSetCyclesLeftNoMCD(SekCyclesLeftNoMCD - CheckDMA());
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100 // be approximate in non-accurate mode
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101 SekSetCyclesLeft(SekCyclesLeft - (len*(((488<<8)/167))>>8));
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104 if ((source&0xe00000)==0xe00000) { // Ram
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105 pd=(u16 *)(Pico.ram+(source&0xfffe));
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106 pdend=(u16 *)(Pico.ram+0x10000);
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107 } else if(PicoMCD & 1) {
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108 elprintf(EL_VDPDMA, "DmaSlow CD, r3=%02x", Pico_mcd->s68k_regs[3]);
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109 if(source<0x20000) { // Bios area
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110 pd=(u16 *)(Pico_mcd->bios+(source&~1));
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111 pdend=(u16 *)(Pico_mcd->bios+0x20000);
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112 } else if ((source&0xfc0000)==0x200000) { // Word Ram
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114 if (!(Pico_mcd->s68k_regs[3]&4)) { // 2M mode
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115 pd=(u16 *)(Pico_mcd->word_ram2M+(source&0x3fffe));
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116 pdend=(u16 *)(Pico_mcd->word_ram2M+0x40000);
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118 if (source < 0x220000) { // 1M mode
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119 int bank = Pico_mcd->s68k_regs[3]&1;
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120 pd=(u16 *)(Pico_mcd->word_ram1M[bank]+(source&0x1fffe));
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121 pdend=(u16 *)(Pico_mcd->word_ram1M[bank]+0x20000);
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123 DmaSlowCell(source, a, len, inc);
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127 } else if ((source&0xfe0000)==0x020000) { // Prg Ram
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128 u8 *prg_ram = Pico_mcd->prg_ram_b[Pico_mcd->s68k_regs[3]>>6];
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129 pd=(u16 *)(prg_ram+(source&0x1fffe));
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130 pdend=(u16 *)(prg_ram+0x20000);
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132 elprintf(EL_VDPDMA|EL_ANOMALY, "DmaSlow FIXME: unsupported src");
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136 if(source<Pico.romsize) { // Rom
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137 pd=(u16 *)(Pico.rom+(source&~1));
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138 pdend=(u16 *)(Pico.rom+Pico.romsize);
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140 elprintf(EL_VDPDMA|EL_ANOMALY, "DmaSlow: invalid dma src");
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145 // overflow protection, might break something..
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146 if (len > pdend - pd) {
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148 elprintf(EL_VDPDMA|EL_ANOMALY, "DmaSlow overflow");
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151 switch (Pico.video.type)
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155 if (inc == 2 && !(a&1) && a+len*2 < 0x10000)
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157 // most used DMA mode
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158 memcpy16(r + (a>>1), pd, len);
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166 if(a&1) d=(d<<8)|(d>>8);
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167 r[a>>1] = (u16)d; // will drop the upper bits
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170 // didn't src overlap?
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171 //if(pd >= pdend) pd-=0x8000; // should be good for RAM, bad for ROM
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178 Pico.m.dirtyPal = 1;
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180 for(a2=a&0x7f; len; len--)
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182 r[a2>>1] = (u16)*pd++; // bit 0 is ignored
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185 // didn't src overlap?
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186 //if(pd >= pdend) pd-=0x8000;
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188 if(a2 >= 0x80) break; // Todds Adventures in Slime World / Andre Agassi tennis
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193 case 5: // vsram[a&0x003f]=d;
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195 for(a2=a&0x7f; len; len--)
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197 r[a2>>1] = (u16)*pd++;
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200 // didn't src overlap?
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201 //if(pd >= pdend) pd-=0x8000;
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203 if(a2 >= 0x80) break;
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209 elprintf(EL_VDPDMA|EL_ANOMALY, "DMA with bad type %i", Pico.video.type);
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213 Pico.video.addr=(u16)a;
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216 static void DmaCopy(int len)
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218 u16 a=Pico.video.addr;
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219 unsigned char *vr = (unsigned char *) Pico.vram;
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220 unsigned char *vrs;
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221 unsigned char inc=Pico.video.reg[0xf];
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223 elprintf(EL_VDPDMA, "DmaCopy len %i [%i]", len, SekCyclesDone());
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225 Pico.m.dma_xfers += len;
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226 if(Pico.m.scanline != -1)
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227 Pico.video.status|=2; // dma busy
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229 source =Pico.video.reg[0x15];
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230 source|=Pico.video.reg[0x16]<<8;
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233 if(source+len > 0x10000) len=0x10000-source; // clip??
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246 // check: Contra, Megaman
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247 // note: this is still inaccurate
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248 static void DmaFill(int data)
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251 unsigned short a=Pico.video.addr;
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252 unsigned char *vr=(unsigned char *) Pico.vram;
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253 unsigned char high = (unsigned char) (data >> 8);
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254 unsigned char inc=Pico.video.reg[0xf];
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256 len=GetDmaLength();
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257 elprintf(EL_VDPDMA, "DmaFill len %i inc %i [%i]", len, inc, SekCyclesDone());
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259 Pico.m.dma_xfers += len;
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260 if(Pico.m.scanline != -1)
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261 Pico.video.status|=2; // dma busy (in accurate mode)
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263 // from Charles MacDonald's genvdp.txt:
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264 // Write lower byte to address specified
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265 vr[a] = (unsigned char) data;
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271 // Write upper byte to adjacent address
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272 // (here we are byteswapped, so address is already 'adjacent')
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275 // Increment address register
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281 Pico.video.reg[0x13] = Pico.video.reg[0x14] = 0; // Dino Dini's Soccer (E) (by Haze)
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286 static void CommandDma(void)
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288 struct PicoVideo *pvid=&Pico.video;
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289 int len=0,method=0;
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291 if ((pvid->reg[1]&0x10)==0) return; // DMA not enabled
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293 len=GetDmaLength();
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295 method=pvid->reg[0x17]>>6;
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296 if (method< 2) DmaSlow(len); // 68000 to VDP
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297 if (method==3) DmaCopy(len); // VRAM Copy
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300 static void CommandChange(void)
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302 struct PicoVideo *pvid=&Pico.video;
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303 unsigned int cmd=0,addr=0;
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307 // Get type of transfer 0xc0000030 (v/c/vsram read/write)
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308 pvid->type=(unsigned char)(((cmd>>2)&0xc)|(cmd>>30));
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310 // Get address 0x3fff0003
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311 addr =(cmd>>16)&0x3fff;
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312 addr|=(cmd<<14)&0xc000;
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313 pvid->addr=(unsigned short)addr;
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316 if (cmd&0x80) CommandDma();
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319 PICO_INTERNAL_ASM void PicoVideoWrite(unsigned int a,unsigned short d)
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321 struct PicoVideo *pvid=&Pico.video;
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325 if (a==0x00) // Data port 0 or 2
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327 if (pvid->pending) {
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332 // If a DMA fill has been set up, do it
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333 if ((pvid->command&0x80) && (pvid->reg[1]&0x10) && (pvid->reg[0x17]>>6)==2)
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339 // preliminary FIFO emulation for Chaos Engine, The (E)
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340 if(!(pvid->status&8) && (pvid->reg[1]&0x40) && Pico.m.scanline!=-1 && !(PicoOpt&0x10000)) // active display, accurate mode?
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342 pvid->status&=~0x200; // FIFO no longer empty
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343 pvid->lwrite_cnt++;
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344 if (pvid->lwrite_cnt >= 4) pvid->status|=0x100; // FIFO full
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345 if (pvid->lwrite_cnt > 4) {
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346 SekCyclesBurn(32); // penalty // 488/12-8
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347 if (SekCycleCnt>=SekCycleAim) SekEndRun(0);
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349 elprintf(EL_ASVDP, "VDP data write: %04x {%i} #%i @ %06x", d, Pico.video.type, pvid->lwrite_cnt, SekPc);
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356 if (a==0x04) // Control (command) port 4 or 6
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360 // Low word of command:
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361 pvid->command&=0xffff0000;
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366 if((d&0xc000)==0x8000)
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369 int num=(d>>8)&0x1f;
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370 if(num==00) elprintf(EL_INTSW, "hint_onoff: %i->%i [%i] pend=%i @ %06x", (pvid->reg[0]&0x10)>>4,
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371 (d&0x10)>>4, SekCyclesDone(), (pvid->pending_ints&0x10)>>4, SekPc);
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372 if(num==01) elprintf(EL_INTSW, "vint_onoff: %i->%i [%i] pend=%i @ %06x", (pvid->reg[1]&0x20)>>5,
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373 (d&0x20)>>5, SekCyclesDone(), (pvid->pending_ints&0x20)>>5, SekPc);
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374 //if(num==01) dprintf("set_blank: %i @ %06x [%i|%i]", !((d&0x40)>>6), SekPc, Pico.m.scanline, SekCyclesDone());
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375 //if(num==10) dprintf("hint_set: %i @ %06x [%i|%i]", (unsigned char)d, SekPc, Pico.m.scanline, SekCyclesDone());
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376 pvid->reg[num]=(unsigned char)d;
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377 #if !(defined(EMU_C68K) && defined(EMU_M68K)) // not debugging Cyclone
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378 // update IRQ level (Lemmings, Wiz 'n' Liz intro, ... )
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379 // may break if done improperly:
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380 // International Superstar Soccer Deluxe (crash), Street Racer (logos), Burning Force (gfx),
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381 // Fatal Rewind (hang), Sesame Street Counting Cafe
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384 // hack: make sure we do not touch the irq line if Cyclone is just about to take the IRQ
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385 if (PicoCpu.irq <= (PicoCpu.srh&7)) {
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388 lines = (pvid->reg[1] & 0x20) | (pvid->reg[0] & 0x10);
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389 pints = (pvid->pending_ints&lines);
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390 if(pints & 0x20) SekInterrupt(6);
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391 else if(pints & 0x10) SekInterrupt(4);
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392 else SekInterrupt(0);
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394 // adjust cycles for Cyclone so it would take the int "in time"
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403 if(num == 5) rendstatus|=1;
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404 else if(num == 0xc) Pico.m.dirtyPal = 2; // renderers should update their palettes if sh/hi mode is changed
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405 pvid->type=0; // register writes clear command (else no Sega logo in Golden Axe II)
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407 // High word of command:
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408 pvid->command&=0x0000ffff;
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409 pvid->command|=d<<16;
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416 PICO_INTERNAL_ASM unsigned int PicoVideoRead(unsigned int a)
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423 if (a==0x00) // data port
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429 if (a==0x04) // control port
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431 struct PicoVideo *pv=&Pico.video;
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433 if (PicoOpt&0x10) d|=0x0020; // sprite collision (Shadow of the Beast)
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434 if (!(pv->reg[1]&0x40)) d|=0x0008; // set V-Blank if display is disabled
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435 if (SekCyclesLeft < 84+4) d|=0x0004; // H-Blank (Sonic3 vs)
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437 d|=(pv->pending_ints&0x20)<<2; // V-int pending?
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438 if (d&0x100) pv->status&=~0x100; // FIFO no longer full
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440 pv->pending=0; // ctrl port reads clear write-pending flag (Charles MacDonald)
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442 elprintf(EL_SR, "SR read: %04x @ %06x", d, SekPc);
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446 // H-counter info (based on Generator):
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448 // | <- hblank? -> |
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449 // start <416> hint <36> hdisplay <38> end // CPU cycles
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450 // |---------...---------|------------|-------------|
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451 // 0 B6 E4 FF // 40 cells
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452 // 0 93 E8 FF // 32 cells
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454 // Gens (?) v-render
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455 // start <hblank=84> hint hdisplay <404> |
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456 // |---------------------|--------------------------|
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457 // E4 (hc[0x43]==0) 07 B1 // 40
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458 // E8 (hc[0x45]==0) 05 91 // 32
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460 // 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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461 if ((a&0x1c)==0x08)
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465 if(Pico.m.scanline != -1) {
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466 int lineCycles=(488-SekCyclesLeft)&0x1ff;
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467 d=Pico.m.scanline; // V-Counter
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469 if(Pico.video.reg[12]&1)
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470 hc=hcounts_40[lineCycles];
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471 else hc=hcounts_32[lineCycles];
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473 //if(lineCycles > 488-12) d++; // Wheel of Fortune
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475 // get approximate V-Counter
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476 d=vcounts[SekCyclesDone()>>8];
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477 hc = Pico.m.rotate&0xff;
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481 if(d >= 0x103) d-=56; // based on Gens
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483 if(d >= 0xEB) d-=6;
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486 if((Pico.video.reg[12]&6) == 6) {
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487 // interlace mode 2 (Combat Cars (UE) [!])
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489 if (d&0xf00) d|= 1;
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492 elprintf(EL_HVCNT, "hv: %02x %02x (%i) @ %06x", hc, d, SekCyclesDone(), SekPc);
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