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https://github.com/RaySollium99/picodrive.git
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602133e1c6
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@408 be3aeb3a-fb24-0410-a615-afba39da0efa
523 lines
15 KiB
C
523 lines
15 KiB
C
// This is part of Pico Library
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// (c) Copyright 2004 Dave, All rights reserved.
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// (c) Copyright 2006-2007, Grazvydas "notaz" Ignotas
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// Free for non-commercial use.
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// For commercial use, separate licencing terms must be obtained.
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#include "PicoInt.h"
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#include "cd/gfx_cd.h"
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extern const unsigned char hcounts_32[];
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extern const unsigned char hcounts_40[];
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extern const unsigned short vcounts[];
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#ifndef UTYPES_DEFINED
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typedef unsigned char u8;
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typedef unsigned short u16;
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typedef unsigned int u32;
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#define UTYPES_DEFINED
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#endif
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int (*PicoDmaHook)(unsigned int source, int len, unsigned short **srcp, unsigned short **limitp) = NULL;
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static __inline void AutoIncrement(void)
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{
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Pico.video.addr=(unsigned short)(Pico.video.addr+Pico.video.reg[0xf]);
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}
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static void VideoWrite(u16 d)
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{
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unsigned int a=Pico.video.addr;
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switch (Pico.video.type)
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{
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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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Pico.vram [(a>>1)&0x7fff]=d;
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rendstatus |= PDRAW_DIRTY_SPRITES; break;
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case 3: Pico.m.dirtyPal = 1;
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Pico.cram [(a>>1)&0x003f]=d; break; // wraps (Desert Strike)
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case 5: Pico.vsram[(a>>1)&0x003f]=d; break;
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//default:elprintf(EL_ANOMALY, "VDP write %04x with bad type %i", d, Pico.video.type); break;
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}
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//dprintf("w[%i] @ %04x, inc=%i [%i|%i]", Pico.video.type, a, Pico.video.reg[0xf], Pico.m.scanline, SekCyclesDone());
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AutoIncrement();
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}
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static unsigned int VideoRead(void)
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{
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unsigned int a=0,d=0;
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a=Pico.video.addr; a>>=1;
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switch (Pico.video.type)
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{
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case 0: d=Pico.vram [a&0x7fff]; break;
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case 8: d=Pico.cram [a&0x003f]; break;
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case 4: d=Pico.vsram[a&0x003f]; break;
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default:elprintf(EL_ANOMALY, "VDP read with bad type %i", Pico.video.type); break;
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}
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AutoIncrement();
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return d;
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}
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static int GetDmaLength(void)
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{
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struct PicoVideo *pvid=&Pico.video;
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int len=0;
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// 16-bit words to transfer:
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len =pvid->reg[0x13];
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len|=pvid->reg[0x14]<<8;
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// Charles MacDonald:
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if(!len) len = 0xffff;
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return len;
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}
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static void DmaSlow(int len)
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{
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u16 *pd=0, *pdend, *r;
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unsigned int a=Pico.video.addr, a2, d;
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unsigned char inc=Pico.video.reg[0xf];
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unsigned int source;
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source =Pico.video.reg[0x15]<<1;
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source|=Pico.video.reg[0x16]<<9;
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source|=Pico.video.reg[0x17]<<17;
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elprintf(EL_VDPDMA, "DmaSlow[%i] %06x->%04x len %i inc=%i blank %i [%i] @ %06x",
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Pico.video.type, source, a, len, inc, (Pico.video.status&8)||!(Pico.video.reg[1]&0x40),
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SekCyclesDone(), SekPc);
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if (Pico.m.scanline != -1) {
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Pico.m.dma_xfers += len;
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if ((PicoAHW & PAHW_MCD) && (PicoOpt & POPT_EN_MCD_PSYNC)) SekCyclesBurn(CheckDMA());
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else SekSetCyclesLeftNoMCD(SekCyclesLeftNoMCD - CheckDMA());
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} else {
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// be approximate in non-accurate mode
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SekSetCyclesLeft(SekCyclesLeft - (len*(((488<<8)/167))>>8));
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}
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if ((source&0xe00000)==0xe00000) { // Ram
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pd=(u16 *)(Pico.ram+(source&0xfffe));
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pdend=(u16 *)(Pico.ram+0x10000);
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}
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else if (PicoAHW & PAHW_MCD)
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{
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elprintf(EL_VDPDMA, "DmaSlow CD, r3=%02x", Pico_mcd->s68k_regs[3]);
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if(source<0x20000) { // Bios area
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pd=(u16 *)(Pico_mcd->bios+(source&~1));
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pdend=(u16 *)(Pico_mcd->bios+0x20000);
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} else if ((source&0xfc0000)==0x200000) { // Word Ram
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source -= 2;
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if (!(Pico_mcd->s68k_regs[3]&4)) { // 2M mode
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pd=(u16 *)(Pico_mcd->word_ram2M+(source&0x3fffe));
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pdend=(u16 *)(Pico_mcd->word_ram2M+0x40000);
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} else {
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if (source < 0x220000) { // 1M mode
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int bank = Pico_mcd->s68k_regs[3]&1;
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pd=(u16 *)(Pico_mcd->word_ram1M[bank]+(source&0x1fffe));
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pdend=(u16 *)(Pico_mcd->word_ram1M[bank]+0x20000);
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} else {
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DmaSlowCell(source, a, len, inc);
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return;
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}
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}
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} else if ((source&0xfe0000)==0x020000) { // Prg Ram
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u8 *prg_ram = Pico_mcd->prg_ram_b[Pico_mcd->s68k_regs[3]>>6];
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pd=(u16 *)(prg_ram+(source&0x1fffe));
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pdend=(u16 *)(prg_ram+0x20000);
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} else {
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elprintf(EL_VDPDMA|EL_ANOMALY, "DmaSlow[%i] %06x->%04x: FIXME: unsupported src", Pico.video.type, source, a);
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return;
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}
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}
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else
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{
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// if we have DmaHook, let it handle ROM because of possible DMA delay
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if (PicoDmaHook && PicoDmaHook(source, len, &pd, &pdend));
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else if (source<Pico.romsize) { // Rom
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pd=(u16 *)(Pico.rom+(source&~1));
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pdend=(u16 *)(Pico.rom+Pico.romsize);
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}
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else {
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elprintf(EL_VDPDMA|EL_ANOMALY, "DmaSlow[%i] %06x->%04x: invalid src", Pico.video.type, source, a);
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return;
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}
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}
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// overflow protection, might break something..
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if (len > pdend - pd) {
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len = pdend - pd;
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elprintf(EL_VDPDMA|EL_ANOMALY, "DmaSlow overflow");
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}
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switch (Pico.video.type)
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{
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case 1: // vram
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r = Pico.vram;
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if (inc == 2 && !(a&1) && a+len*2 < 0x10000)
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{
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// most used DMA mode
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memcpy16(r + (a>>1), pd, len);
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a += len*2;
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}
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else
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{
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for(; len; len--)
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{
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d=*pd++;
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if(a&1) d=(d<<8)|(d>>8);
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r[a>>1] = (u16)d; // will drop the upper bits
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// AutoIncrement
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a=(u16)(a+inc);
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// didn't src overlap?
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//if(pd >= pdend) pd-=0x8000; // should be good for RAM, bad for ROM
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}
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}
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rendstatus |= PDRAW_DIRTY_SPRITES;
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break;
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case 3: // cram
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Pico.m.dirtyPal = 1;
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r = Pico.cram;
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for(a2=a&0x7f; len; len--)
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{
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r[a2>>1] = (u16)*pd++; // bit 0 is ignored
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// AutoIncrement
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a2+=inc;
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// didn't src overlap?
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//if(pd >= pdend) pd-=0x8000;
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// good dest?
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if(a2 >= 0x80) break; // Todds Adventures in Slime World / Andre Agassi tennis
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}
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a=(a&0xff00)|a2;
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break;
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case 5: // vsram[a&0x003f]=d;
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r = Pico.vsram;
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for(a2=a&0x7f; len; len--)
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{
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r[a2>>1] = (u16)*pd++;
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// AutoIncrement
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a2+=inc;
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// didn't src overlap?
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//if(pd >= pdend) pd-=0x8000;
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// good dest?
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if(a2 >= 0x80) break;
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}
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a=(a&0xff00)|a2;
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break;
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default:
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elprintf(EL_VDPDMA|EL_ANOMALY, "DMA with bad type %i", Pico.video.type);
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break;
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}
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// remember addr
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Pico.video.addr=(u16)a;
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}
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static void DmaCopy(int len)
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{
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u16 a=Pico.video.addr;
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unsigned char *vr = (unsigned char *) Pico.vram;
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unsigned char *vrs;
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unsigned char inc=Pico.video.reg[0xf];
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int source;
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elprintf(EL_VDPDMA, "DmaCopy len %i [%i]", len, SekCyclesDone());
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Pico.m.dma_xfers += len;
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if(Pico.m.scanline != -1)
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Pico.video.status|=2; // dma busy
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source =Pico.video.reg[0x15];
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source|=Pico.video.reg[0x16]<<8;
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vrs=vr+source;
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if(source+len > 0x10000) len=0x10000-source; // clip??
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for(;len;len--)
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{
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vr[a] = *vrs++;
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// AutoIncrement
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a=(u16)(a+inc);
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}
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// remember addr
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Pico.video.addr=a;
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rendstatus |= PDRAW_DIRTY_SPRITES;
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}
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// check: Contra, Megaman
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// note: this is still inaccurate
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static void DmaFill(int data)
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{
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int len;
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unsigned short a=Pico.video.addr;
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unsigned char *vr=(unsigned char *) Pico.vram;
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unsigned char high = (unsigned char) (data >> 8);
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unsigned char inc=Pico.video.reg[0xf];
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len=GetDmaLength();
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elprintf(EL_VDPDMA, "DmaFill len %i inc %i [%i]", len, inc, SekCyclesDone());
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Pico.m.dma_xfers += len;
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if(Pico.m.scanline != -1)
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Pico.video.status|=2; // dma busy (in accurate mode)
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// from Charles MacDonald's genvdp.txt:
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// Write lower byte to address specified
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vr[a] = (unsigned char) data;
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a=(u16)(a+inc);
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if(!inc) len=1;
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for(;len;len--) {
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// Write upper byte to adjacent address
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// (here we are byteswapped, so address is already 'adjacent')
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vr[a] = high;
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// Increment address register
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a=(u16)(a+inc);
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}
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// remember addr
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Pico.video.addr=a;
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// update length
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Pico.video.reg[0x13] = Pico.video.reg[0x14] = 0; // Dino Dini's Soccer (E) (by Haze)
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rendstatus |= PDRAW_DIRTY_SPRITES;
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}
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static void CommandDma(void)
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{
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struct PicoVideo *pvid=&Pico.video;
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int len=0,method=0;
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if ((pvid->reg[1]&0x10)==0) return; // DMA not enabled
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len=GetDmaLength();
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method=pvid->reg[0x17]>>6;
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if (method< 2) DmaSlow(len); // 68000 to VDP
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if (method==3) DmaCopy(len); // VRAM Copy
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}
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static void CommandChange(void)
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{
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struct PicoVideo *pvid=&Pico.video;
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unsigned int cmd=0,addr=0;
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cmd=pvid->command;
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// Get type of transfer 0xc0000030 (v/c/vsram read/write)
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pvid->type=(unsigned char)(((cmd>>2)&0xc)|(cmd>>30));
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// Get address 0x3fff0003
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addr =(cmd>>16)&0x3fff;
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addr|=(cmd<<14)&0xc000;
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pvid->addr=(unsigned short)addr;
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// Check for dma:
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if (cmd&0x80) CommandDma();
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}
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PICO_INTERNAL_ASM void PicoVideoWrite(unsigned int a,unsigned short d)
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{
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struct PicoVideo *pvid=&Pico.video;
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a&=0x1c;
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if (a==0x00) // Data port 0 or 2
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{
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if (pvid->pending) {
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CommandChange();
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pvid->pending=0;
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}
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// If a DMA fill has been set up, do it
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if ((pvid->command&0x80) && (pvid->reg[1]&0x10) && (pvid->reg[0x17]>>6)==2)
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{
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DmaFill(d);
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}
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else
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{
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// preliminary FIFO emulation for Chaos Engine, The (E)
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if(!(pvid->status&8) && (pvid->reg[1]&0x40) && Pico.m.scanline!=-1 && !(PicoOpt&POPT_DIS_VDP_FIFO)) // active display, accurate mode?
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{
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pvid->status&=~0x200; // FIFO no longer empty
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pvid->lwrite_cnt++;
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if (pvid->lwrite_cnt >= 4) pvid->status|=0x100; // FIFO full
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if (pvid->lwrite_cnt > 4) {
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SekCyclesBurn(32); // penalty // 488/12-8
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if (SekCycleCnt>=SekCycleAim) SekEndRun(0);
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}
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elprintf(EL_ASVDP, "VDP data write: %04x {%i} #%i @ %06x", d, Pico.video.type, pvid->lwrite_cnt, SekPc);
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}
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VideoWrite(d);
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}
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return;
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}
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if (a==0x04) // Control (command) port 4 or 6
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{
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if(pvid->pending)
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{
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// Low word of command:
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pvid->command&=0xffff0000;
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pvid->command|=d;
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pvid->pending=0;
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CommandChange();
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}
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else
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{
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if ((d&0xc000)==0x8000)
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{
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// Register write:
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int num=(d>>8)&0x1f;
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int dold=pvid->reg[num];
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pvid->type=0; // register writes clear command (else no Sega logo in Golden Axe II)
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if (num > 0x0a && !(pvid->reg[1]&4)) {
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elprintf(EL_ANOMALY, "%02x written to reg %02x in SMS mode @ %06x", d, num, SekPc);
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return;
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} else
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pvid->reg[num]=(unsigned char)d;
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switch (num)
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{
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case 0x00:
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elprintf(EL_INTSW, "hint_onoff: %i->%i [%i] pend=%i @ %06x", (dold&0x10)>>4,
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(d&0x10)>>4, SekCyclesDone(), (pvid->pending_ints&0x10)>>4, SekPc);
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goto update_irq;
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case 0x01:
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elprintf(EL_INTSW, "vint_onoff: %i->%i [%i] pend=%i @ %06x", (dold&0x20)>>5,
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(d&0x20)>>5, SekCyclesDone(), (pvid->pending_ints&0x20)>>5, SekPc);
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if (!(d&0x40) && SekCyclesLeft > 420) { /*elprintf(EL_ANOMALY, "aa %i", SekCyclesLeft);*/ rendstatus |= PDRAW_EARLY_BLANK; }
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goto update_irq;
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case 0x05:
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if (d^dold) rendstatus |= PDRAW_SPRITES_MOVED;
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break;
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case 0x0c:
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// renderers should update their palettes if sh/hi mode is changed
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if ((d^dold)&8) Pico.m.dirtyPal = 2;
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break;
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}
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return;
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update_irq:
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#ifndef EMU_CORE_DEBUG
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// update IRQ level (Lemmings, Wiz 'n' Liz intro, ... )
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// may break if done improperly:
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// International Superstar Soccer Deluxe (crash), Street Racer (logos), Burning Force (gfx),
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// Fatal Rewind (crash), Sesame Street Counting Cafe
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if (!SekShouldInterrupt) // hack
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{
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int lines, pints, irq=0;
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lines = (pvid->reg[1] & 0x20) | (pvid->reg[0] & 0x10);
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pints = (pvid->pending_ints&lines);
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if(pints & 0x20) irq = 6;
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else if(pints & 0x10) irq = 4;
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SekInterrupt(irq); // update line
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if (irq && Pico.m.scanline!=-1) SekEndRun(24); // make it delayed
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}
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#endif
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}
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else
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{
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// High word of command:
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pvid->command&=0x0000ffff;
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pvid->command|=d<<16;
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pvid->pending=1;
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}
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}
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}
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}
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PICO_INTERNAL_ASM unsigned int PicoVideoRead(unsigned int a)
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{
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unsigned int d=0;
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a&=0x1c;
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if (a==0x00) // data port
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{
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d=VideoRead();
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goto end;
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}
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if (a==0x04) // control port
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{
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struct PicoVideo *pv=&Pico.video;
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d=pv->status;
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if (PicoOpt&POPT_ALT_RENDERER) d|=0x0020; // sprite collision (Shadow of the Beast)
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if (!(pv->reg[1]&0x40)) d|=0x0008; // set V-Blank if display is disabled
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if (SekCyclesLeft < 84+4) d|=0x0004; // H-Blank (Sonic3 vs)
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d|=(pv->pending_ints&0x20)<<2; // V-int pending?
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if (d&0x100) pv->status&=~0x100; // FIFO no longer full
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pv->pending=0; // ctrl port reads clear write-pending flag (Charles MacDonald)
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elprintf(EL_SR, "SR read: %04x @ %06x", d, SekPc);
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goto end;
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|
}
|
|
|
|
// H-counter info (based on Generator):
|
|
// frame:
|
|
// | <- hblank? -> |
|
|
// start <416> hint <36> hdisplay <38> end // CPU cycles
|
|
// |---------...---------|------------|-------------|
|
|
// 0 B6 E4 FF // 40 cells
|
|
// 0 93 E8 FF // 32 cells
|
|
|
|
// Gens (?) v-render
|
|
// start <hblank=84> hint hdisplay <404> |
|
|
// |---------------------|--------------------------|
|
|
// E4 (hc[0x43]==0) 07 B1 // 40
|
|
// E8 (hc[0x45]==0) 05 91 // 32
|
|
|
|
// check: Sonic 3D Blast bonus, Cannon Fodder, Chase HQ II, 3 Ninjas kick back, Road Rash 3, Skitchin', Wheel of Fortune
|
|
if ((a&0x1c)==0x08)
|
|
{
|
|
unsigned int hc;
|
|
|
|
if(Pico.m.scanline != -1) {
|
|
int lineCycles=(488-SekCyclesLeft)&0x1ff;
|
|
d=Pico.m.scanline; // V-Counter
|
|
|
|
if(Pico.video.reg[12]&1)
|
|
hc=hcounts_40[lineCycles];
|
|
else hc=hcounts_32[lineCycles];
|
|
|
|
//if(lineCycles > 488-12) d++; // Wheel of Fortune
|
|
} else {
|
|
// get approximate V-Counter
|
|
d=vcounts[SekCyclesDone()>>8];
|
|
hc = Pico.m.rotate&0xff;
|
|
}
|
|
|
|
if(Pico.m.pal) {
|
|
if(d >= 0x103) d-=56; // based on Gens
|
|
} else {
|
|
if(d >= 0xEB) d-=6;
|
|
}
|
|
|
|
if((Pico.video.reg[12]&6) == 6) {
|
|
// interlace mode 2 (Combat Cars (UE) [!])
|
|
d <<= 1;
|
|
if (d&0xf00) d|= 1;
|
|
}
|
|
|
|
elprintf(EL_HVCNT, "hv: %02x %02x (%i) @ %06x", hc, d, SekCyclesDone(), SekPc);
|
|
d&=0xff; d<<=8;
|
|
d|=hc;
|
|
goto end;
|
|
}
|
|
|
|
end:
|
|
|
|
return d;
|
|
}
|