3 // (c) Copyright 2004 Dave, All rights reserved.
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4 // (c) Copyright 2006-2008, 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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16 #ifndef UTYPES_DEFINED
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17 typedef unsigned char u8;
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18 typedef unsigned short u16;
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19 typedef unsigned int u32;
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20 #define UTYPES_DEFINED
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23 int (*PicoDmaHook)(unsigned int source, int len, unsigned short **srcp, unsigned short **limitp) = NULL;
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25 static __inline void AutoIncrement(void)
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27 Pico.video.addr=(unsigned short)(Pico.video.addr+Pico.video.reg[0xf]);
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30 static void VideoWrite(u16 d)
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32 unsigned int a=Pico.video.addr;
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34 switch (Pico.video.type)
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36 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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37 Pico.vram [(a>>1)&0x7fff]=d;
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38 if (a - ((unsigned)(Pico.video.reg[5]&0x7f) << 9) < 0x400)
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39 rendstatus |= PDRAW_DIRTY_SPRITES;
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41 case 3: Pico.m.dirtyPal = 1;
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42 Pico.cram [(a>>1)&0x003f]=d; break; // wraps (Desert Strike)
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43 case 5: Pico.vsram[(a>>1)&0x003f]=d; break;
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44 //default:elprintf(EL_ANOMALY, "VDP write %04x with bad type %i", d, Pico.video.type); break;
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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 Pico.m.dma_xfers += len;
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96 if ((PicoAHW & PAHW_MCD) && (PicoOpt & POPT_EN_MCD_PSYNC)) SekCyclesBurn(CheckDMA());
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97 else SekSetCyclesLeftNoMCD(SekCyclesLeftNoMCD - CheckDMA());
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99 if ((source&0xe00000)==0xe00000) { // Ram
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100 pd=(u16 *)(Pico.ram+(source&0xfffe));
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101 pdend=(u16 *)(Pico.ram+0x10000);
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103 else if (PicoAHW & PAHW_MCD)
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105 elprintf(EL_VDPDMA, "DmaSlow CD, r3=%02x", Pico_mcd->s68k_regs[3]);
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106 if(source<0x20000) { // Bios area
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107 pd=(u16 *)(Pico_mcd->bios+(source&~1));
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108 pdend=(u16 *)(Pico_mcd->bios+0x20000);
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109 } else if ((source&0xfc0000)==0x200000) { // Word Ram
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111 if (!(Pico_mcd->s68k_regs[3]&4)) { // 2M mode
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112 pd=(u16 *)(Pico_mcd->word_ram2M+(source&0x3fffe));
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113 pdend=(u16 *)(Pico_mcd->word_ram2M+0x40000);
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115 if (source < 0x220000) { // 1M mode
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116 int bank = Pico_mcd->s68k_regs[3]&1;
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117 pd=(u16 *)(Pico_mcd->word_ram1M[bank]+(source&0x1fffe));
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118 pdend=(u16 *)(Pico_mcd->word_ram1M[bank]+0x20000);
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120 DmaSlowCell(source, a, len, inc);
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124 } else if ((source&0xfe0000)==0x020000) { // Prg Ram
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125 u8 *prg_ram = Pico_mcd->prg_ram_b[Pico_mcd->s68k_regs[3]>>6];
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126 pd=(u16 *)(prg_ram+(source&0x1fffe));
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127 pdend=(u16 *)(prg_ram+0x20000);
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129 elprintf(EL_VDPDMA|EL_ANOMALY, "DmaSlow[%i] %06x->%04x: FIXME: unsupported src", Pico.video.type, source, a);
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135 // if we have DmaHook, let it handle ROM because of possible DMA delay
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136 if (PicoDmaHook && PicoDmaHook(source, len, &pd, &pdend));
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137 else if (source<Pico.romsize) { // Rom
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138 pd=(u16 *)(Pico.rom+(source&~1));
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139 pdend=(u16 *)(Pico.rom+Pico.romsize);
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142 elprintf(EL_VDPDMA|EL_ANOMALY, "DmaSlow[%i] %06x->%04x: invalid src", Pico.video.type, source, a);
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147 // overflow protection, might break something..
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148 if (len > pdend - pd) {
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150 elprintf(EL_VDPDMA|EL_ANOMALY, "DmaSlow overflow");
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153 switch (Pico.video.type)
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157 if (inc == 2 && !(a&1) && a+len*2 < 0x10000)
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159 // most used DMA mode
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160 memcpy16(r + (a>>1), pd, len);
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168 if(a&1) d=(d<<8)|(d>>8);
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169 r[a>>1] = (u16)d; // will drop the upper bits
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172 // didn't src overlap?
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173 //if(pd >= pdend) pd-=0x8000; // should be good for RAM, bad for ROM
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176 rendstatus |= PDRAW_DIRTY_SPRITES;
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180 Pico.m.dirtyPal = 1;
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182 for(a2=a&0x7f; len; len--)
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184 r[a2>>1] = (u16)*pd++; // bit 0 is ignored
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187 // didn't src overlap?
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188 //if(pd >= pdend) pd-=0x8000;
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190 if(a2 >= 0x80) break; // Todds Adventures in Slime World / Andre Agassi tennis
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195 case 5: // vsram[a&0x003f]=d;
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197 for(a2=a&0x7f; len; len--)
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199 r[a2>>1] = (u16)*pd++;
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202 // didn't src overlap?
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203 //if(pd >= pdend) pd-=0x8000;
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205 if(a2 >= 0x80) break;
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211 elprintf(EL_VDPDMA|EL_ANOMALY, "DMA with bad type %i", Pico.video.type);
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215 Pico.video.addr=(u16)a;
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218 static void DmaCopy(int len)
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220 u16 a=Pico.video.addr;
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221 unsigned char *vr = (unsigned char *) Pico.vram;
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222 unsigned char *vrs;
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223 unsigned char inc=Pico.video.reg[0xf];
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225 elprintf(EL_VDPDMA, "DmaCopy len %i [%i]", len, SekCyclesDone());
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227 Pico.m.dma_xfers += len;
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228 Pico.video.status |= 2; // dma busy
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230 source =Pico.video.reg[0x15];
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231 source|=Pico.video.reg[0x16]<<8;
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234 if (source+len > 0x10000) len=0x10000-source; // clip??
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244 rendstatus |= PDRAW_DIRTY_SPRITES;
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247 // check: Contra, Megaman
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248 // note: this is still inaccurate
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249 static void DmaFill(int data)
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252 unsigned short a=Pico.video.addr;
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253 unsigned char *vr=(unsigned char *) Pico.vram;
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254 unsigned char high = (unsigned char) (data >> 8);
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255 unsigned char inc=Pico.video.reg[0xf];
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257 len=GetDmaLength();
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258 elprintf(EL_VDPDMA, "DmaFill len %i inc %i [%i]", len, inc, SekCyclesDone());
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260 Pico.m.dma_xfers += len;
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261 Pico.video.status |= 2; // dma busy
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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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270 for (; len; len--) {
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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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283 rendstatus |= PDRAW_DIRTY_SPRITES;
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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 static __inline void DrawSync(int blank_on)
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321 if (Pico.m.scanline < 224 && !(PicoOpt & POPT_ALT_RENDERER) &&
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322 !PicoSkipFrame && DrawScanline <= Pico.m.scanline) {
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323 //elprintf(EL_ANOMALY, "sync");
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324 PicoDrawSync(Pico.m.scanline, blank_on);
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328 PICO_INTERNAL_ASM void PicoVideoWrite(unsigned int a,unsigned short d)
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330 struct PicoVideo *pvid=&Pico.video;
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332 //if (Pico.m.scanline < 224)
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333 // elprintf(EL_STATUS, "PicoVideoWrite [%06x] %04x", a, d);
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336 if (a==0x00) // Data port 0 or 2
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338 // try avoiding the sync..
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339 if (Pico.m.scanline < 224 && (pvid->reg[1]&0x40) &&
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340 !(!pvid->pending &&
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341 ((pvid->command & 0xc00000f0) == 0x40000010 && Pico.vsram[pvid->addr>>1] == d))
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345 if (pvid->pending) {
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350 // If a DMA fill has been set up, do it
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351 if ((pvid->command&0x80) && (pvid->reg[1]&0x10) && (pvid->reg[0x17]>>6)==2)
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357 // preliminary FIFO emulation for Chaos Engine, The (E)
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358 if (!(pvid->status&8) && (pvid->reg[1]&0x40) && !(PicoOpt&POPT_DIS_VDP_FIFO)) // active display?
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360 pvid->status&=~0x200; // FIFO no longer empty
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361 pvid->lwrite_cnt++;
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362 if (pvid->lwrite_cnt >= 4) pvid->status|=0x100; // FIFO full
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363 if (pvid->lwrite_cnt > 4) {
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364 SekCyclesBurn(32); // penalty // 488/12-8
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365 if (SekCycleCnt>=SekCycleAim) SekEndRun(0);
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367 elprintf(EL_ASVDP, "VDP data write: %04x {%i} #%i @ %06x", d, Pico.video.type, pvid->lwrite_cnt, SekPc);
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374 if (a==0x04) // Control (command) port 4 or 6
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378 if (d & 0x80) DrawSync(0); // only need sync for DMA
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379 // Low word of command:
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380 pvid->command&=0xffff0000;
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387 if ((d&0xc000)==0x8000)
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390 int num=(d>>8)&0x1f;
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391 int dold=pvid->reg[num];
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392 int update_irq = 0, blank_on = 0;
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393 pvid->type=0; // register writes clear command (else no Sega logo in Golden Axe II)
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394 if (num > 0x0a && !(pvid->reg[1]&4)) {
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395 elprintf(EL_ANOMALY, "%02x written to reg %02x in SMS mode @ %06x", d, num, SekPc);
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402 elprintf(EL_INTSW, "hint_onoff: %i->%i [%i] pend=%i @ %06x", (dold&0x10)>>4,
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403 (d&0x10)>>4, SekCyclesDone(), (pvid->pending_ints&0x10)>>4, SekPc);
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407 elprintf(EL_INTSW, "vint_onoff: %i->%i [%i] pend=%i @ %06x", (dold&0x20)>>5,
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408 (d&0x20)>>5, SekCyclesDone(), (pvid->pending_ints&0x20)>>5, SekPc);
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409 if (!(d&0x40) && SekCyclesLeft > 390) blank_on = 1;
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413 if (d^dold) rendstatus |= PDRAW_SPRITES_MOVED;
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416 // renderers should update their palettes if sh/hi mode is changed
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417 if ((d^dold)&8) Pico.m.dirtyPal = 2;
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420 DrawSync(blank_on);
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421 pvid->reg[num]=(unsigned char)d;
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422 if (!update_irq) return;
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424 #ifndef EMU_CORE_DEBUG
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425 // update IRQ level
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426 if (!SekShouldInterrupt) // hack
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428 int lines, pints, irq=0;
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429 lines = (pvid->reg[1] & 0x20) | (pvid->reg[0] & 0x10);
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430 pints = (pvid->pending_ints&lines);
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431 if (pints & 0x20) irq = 6;
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432 else if (pints & 0x10) irq = 4;
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433 SekInterrupt(irq); // update line
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435 if (irq) SekEndRun(24); // make it delayed
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441 // High word of command:
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442 pvid->command&=0x0000ffff;
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443 pvid->command|=d<<16;
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450 PICO_INTERNAL_ASM unsigned int PicoVideoRead(unsigned int a)
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454 if (a==0x04) // control port
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456 struct PicoVideo *pv=&Pico.video;
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459 //if (PicoOpt&POPT_ALT_RENDERER) d|=0x0020; // sprite collision (Shadow of the Beast)
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460 if (SekCyclesLeft < 84+4) d|=0x0004; // H-Blank (Sonic3 vs)
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462 d |= ((pv->reg[1]&0x40)^0x40) >> 3; // set V-Blank if display is disabled
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463 d |= (pv->pending_ints&0x20)<<2; // V-int pending?
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464 if (d&0x100) pv->status&=~0x100; // FIFO no longer full
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466 pv->pending = 0; // ctrl port reads clear write-pending flag (Charles MacDonald)
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468 elprintf(EL_SR, "SR read: %04x @ %06x", d, SekPc);
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472 // H-counter info (based on Generator):
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474 // | <- hblank? -> |
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475 // start <416> hint <36> hdisplay <38> end // CPU cycles
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476 // |---------...---------|------------|-------------|
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477 // 0 B6 E4 FF // 40 cells
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478 // 0 93 E8 FF // 32 cells
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480 // Gens (?) v-render
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481 // start <hblank=84> hint hdisplay <404> |
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482 // |---------------------|--------------------------|
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483 // E4 (hc[0x43]==0) 07 B1 // 40
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484 // E8 (hc[0x45]==0) 05 91 // 32
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486 // 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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487 if ((a&0x1c)==0x08)
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492 lineCycles = (488-SekCyclesLeft)&0x1ff;
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493 if (Pico.video.reg[12]&1)
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494 d = hcounts_40[lineCycles];
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495 else d = hcounts_32[lineCycles];
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497 elprintf(EL_HVCNT, "hv: %02x %02x (%i) @ %06x", d, Pico.video.v_counter, SekCyclesDone(), SekPc);
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498 return d | (Pico.video.v_counter << 8);
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501 if (a==0x00) // data port
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503 return VideoRead();
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509 unsigned int PicoVideoRead8(unsigned int a)
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516 case 0: return VideoRead() >> 8;
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517 case 1: return VideoRead() & 0xff;
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518 case 4: // control port/status reg
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519 d = Pico.video.status >> 8;
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520 if (d&1) Pico.video.status&=~0x100; // FIFO no longer full
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521 Pico.video.pending = 0;
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522 elprintf(EL_SR, "SR read (h): %02x @ %06x", d, SekPc);
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525 d = Pico.video.status & 0xff;
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526 //if (PicoOpt&POPT_ALT_RENDERER) d|=0x0020; // sprite collision (Shadow of the Beast)
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527 d |= ((Pico.video.reg[1]&0x40)^0x40) >> 3; // set V-Blank if display is disabled
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528 d |= (Pico.video.pending_ints&0x20)<<2; // V-int pending?
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529 if (SekCyclesLeft < 84+4) d |= 4; // H-Blank
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530 Pico.video.pending = 0;
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531 elprintf(EL_SR, "SR read (l): %02x @ %06x", d, SekPc);
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533 case 8: // hv counter
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534 elprintf(EL_HVCNT, "vcounter: %02x (%i) @ %06x", Pico.video.v_counter, SekCyclesDone(), SekPc);
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535 return Pico.video.v_counter;
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537 d = (488-SekCyclesLeft)&0x1ff;
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538 if (Pico.video.reg[12]&1)
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540 else d = hcounts_32[d];
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541 elprintf(EL_HVCNT, "hcounter: %02x (%i) @ %06x", d, SekCyclesDone(), SekPc);
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