mirror of
https://github.com/RaySollium99/picodrive.git
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552 lines
16 KiB
C
552 lines
16 KiB
C
/*
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* PicoDrive
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* (c) Copyright Dave, 2004
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* (C) notaz, 2006-2009
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*
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* This work is licensed under the terms of MAME license.
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* See COPYING file in the top-level directory.
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*/
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#include "pico_int.h"
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#define NEED_DMA_SOURCE
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#include "memory.h"
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int line_base_cycles;
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extern const unsigned char hcounts_32[];
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extern const unsigned char hcounts_40[];
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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 **base, unsigned int *mask) = 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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if (a - ((unsigned)(Pico.video.reg[5]&0x7f) << 9) < 0x400)
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Pico.est.rendstatus |= PDRAW_DIRTY_SPRITES;
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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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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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len = ((len - 1) & 0xffff) + 1;
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return len;
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}
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static void DmaSlow(int len, unsigned int source)
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{
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u32 inc = Pico.video.reg[0xf];
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u32 a = Pico.video.addr;
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u16 *r, *base = NULL;
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u32 mask = 0x1ffff;
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elprintf(EL_VDPDMA, "DmaSlow[%i] %06x->%04x len %i inc=%i blank %i [%u] @ %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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Pico.m.dma_xfers += len;
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if (Pico.m.dma_xfers < len) // lame 16bit var
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Pico.m.dma_xfers = ~0;
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SekCyclesBurnRun(CheckDMA());
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if ((source & 0xe00000) == 0xe00000) { // Ram
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base = (u16 *)Pico.ram;
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mask = 0xffff;
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}
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else if (PicoAHW & PAHW_MCD)
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{
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u8 r3 = Pico_mcd->s68k_regs[3];
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elprintf(EL_VDPDMA, "DmaSlow CD, r3=%02x", r3);
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if (source < 0x20000) { // Bios area
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base = (u16 *)Pico_mcd->bios;
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} else if ((source & 0xfc0000) == 0x200000) { // Word Ram
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if (!(r3 & 4)) { // 2M mode
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base = (u16 *)(Pico_mcd->word_ram2M + (source & 0x20000));
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} else {
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if (source < 0x220000) { // 1M mode
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int bank = r3 & 1;
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base = (u16 *)(Pico_mcd->word_ram1M[bank]);
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} else {
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DmaSlowCell(source - 2, a, len, inc);
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return;
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}
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}
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source -= 2;
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} else if ((source & 0xfe0000) == 0x020000) { // Prg Ram
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base = (u16 *)Pico_mcd->prg_ram_b[r3 >> 6];
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source -= 2; // XXX: test
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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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u32 source2;
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if (PicoDmaHook && (source2 = PicoDmaHook(source, len, &base, &mask)))
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source = source2;
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else // Rom
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base = m68k_dma_source(source);
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}
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if (!base) {
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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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// operate in words
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source >>= 1;
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mask >>= 1;
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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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&& !(((source + len - 1) ^ source) & ~mask))
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{
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// most used DMA mode
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memcpy((char *)r + a, base + (source & mask), len * 2);
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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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u16 d = base[source++ & mask];
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if(a & 1) d=(d<<8)|(d>>8);
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r[a >> 1] = d;
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// AutoIncrement
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a = (u16)(a + inc);
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}
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}
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Pico.est.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 (; len; len--)
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{
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r[(a / 2) & 0x3f] = base[source++ & mask];
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// AutoIncrement
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a += inc;
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}
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break;
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case 5: // vsram
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r = Pico.vsram;
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for (; len; len--)
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{
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r[(a / 2) & 0x3f] = base[source++ & mask];
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// AutoIncrement
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a += inc;
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}
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break;
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default:
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if (Pico.video.type != 0 || (EL_LOGMASK & EL_VDPDMA))
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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 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.dma_xfers < len)
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Pico.m.dma_xfers = ~0;
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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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for (; len; len--)
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{
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vr[a] = vr[source++ & 0xffff];
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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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Pico.est.rendstatus |= PDRAW_DIRTY_SPRITES;
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}
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static NOINLINE void DmaFill(int data)
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{
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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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int source;
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int len, l;
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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.dma_xfers < len) // lame 16bit var
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Pico.m.dma_xfers = ~0;
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Pico.video.status |= 2; // dma busy
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switch (Pico.video.type)
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{
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case 1: // vram
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for (l = len; l; l--) {
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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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break;
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case 3: // cram
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case 5: { // vsram
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// TODO: needs fifo; anyone using these?
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static int once;
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if (!once++)
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elprintf(EL_STATUS|EL_ANOMALY|EL_VDPDMA, "TODO: cram/vsram fill");
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}
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default:
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a += len * inc;
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break;
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}
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// remember addr
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Pico.video.addr = a;
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// register update
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Pico.video.reg[0x13] = Pico.video.reg[0x14] = 0;
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source = Pico.video.reg[0x15];
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source |= Pico.video.reg[0x16] << 8;
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source += len;
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Pico.video.reg[0x15] = source;
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Pico.video.reg[0x16] = source >> 8;
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Pico.est.rendstatus |= PDRAW_DIRTY_SPRITES;
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}
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static NOINLINE void CommandDma(void)
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{
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struct PicoVideo *pvid=&Pico.video;
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u32 len, method;
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u32 source;
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if ((pvid->reg[1]&0x10)==0) return; // DMA not enabled
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len = GetDmaLength();
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source =Pico.video.reg[0x15];
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source|=Pico.video.reg[0x16] << 8;
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source|=Pico.video.reg[0x17] << 16;
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method=pvid->reg[0x17]>>6;
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if (method < 2)
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DmaSlow(len, source << 1); // 68000 to VDP
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else if (method == 3)
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DmaCopy(len); // VRAM Copy
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else
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return;
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source += len;
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Pico.video.reg[0x13] = Pico.video.reg[0x14] = 0;
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Pico.video.reg[0x15] = source;
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Pico.video.reg[0x16] = source >> 8;
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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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}
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static void DrawSync(int blank_on)
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{
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if (Pico.m.scanline < 224 && !(PicoOpt & POPT_ALT_RENDERER) &&
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!PicoSkipFrame && Pico.est.DrawScanline <= Pico.m.scanline) {
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//elprintf(EL_ANOMALY, "sync");
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PicoDrawSync(Pico.m.scanline, blank_on);
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}
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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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//if (Pico.m.scanline < 224)
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// elprintf(EL_STATUS, "PicoVideoWrite [%06x] %04x", a, d);
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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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// try avoiding the sync..
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if (Pico.m.scanline < 224 && (pvid->reg[1]&0x40) &&
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!(!pvid->pending &&
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((pvid->command & 0xc00000f0) == 0x40000010 && Pico.vsram[pvid->addr>>1] == d))
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)
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DrawSync(0);
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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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// preliminary FIFO emulation for Chaos Engine, The (E)
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if (!(pvid->status&8) && (pvid->reg[1]&0x40) && !(PicoOpt&POPT_DIS_VDP_FIFO)) // active display?
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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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SekCyclesBurnRun(32); // penalty // 488/12-8
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}
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elprintf(EL_ASVDP, "VDP data write: %04x [%06x] {%i} #%i @ %06x", d, Pico.video.addr,
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Pico.video.type, pvid->lwrite_cnt, SekPc);
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}
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VideoWrite(d);
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if ((pvid->command&0x80) && (pvid->reg[1]&0x10) && (pvid->reg[0x17]>>6)==2)
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DmaFill(d);
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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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// Check for dma:
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if (d & 0x80) {
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DrawSync(0);
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CommandDma();
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}
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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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int blank_on = 0;
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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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}
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if (num == 1 && !(d&0x40) && SekCyclesDone() - line_base_cycles <= 488-390)
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blank_on = 1;
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DrawSync(blank_on);
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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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goto update_irq;
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case 0x05:
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//elprintf(EL_STATUS, "spritep moved to %04x", (unsigned)(Pico.video.reg[5]&0x7f) << 9);
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if (d^dold) Pico.est.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
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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) 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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a&=0x1c;
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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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unsigned int d;
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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 (SekCyclesDone() - line_base_cycles >= 488-88)
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d|=0x0004; // H-Blank (Sonic3 vs)
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d |= ((pv->reg[1]&0x40)^0x40) >> 3; // set V-Blank if display is disabled
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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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return d;
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}
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// H-counter info (based on Generator):
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// frame:
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// | <- hblank? -> |
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// start <416> hint <36> hdisplay <38> end // CPU cycles
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// |---------...---------|------------|-------------|
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// 0 B6 E4 FF // 40 cells
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// 0 93 E8 FF // 32 cells
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// Gens (?) v-render
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// start <hblank=84> hint hdisplay <404> |
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// |---------------------|--------------------------|
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// E4 (hc[0x43]==0) 07 B1 // 40
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// E8 (hc[0x45]==0) 05 91 // 32
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// 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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if ((a&0x1c)==0x08)
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{
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unsigned int d;
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d = (SekCyclesDone() - line_base_cycles) & 0x1ff; // FIXME
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if (Pico.video.reg[12]&1)
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d = hcounts_40[d];
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else d = hcounts_32[d];
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elprintf(EL_HVCNT, "hv: %02x %02x (%i) @ %06x", d, Pico.video.v_counter, SekCyclesDone(), SekPc);
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return d | (Pico.video.v_counter << 8);
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}
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if (a==0x00) // data port
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{
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return VideoRead();
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}
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return 0;
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}
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unsigned int PicoVideoRead8(unsigned int a)
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{
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unsigned int d;
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a&=0x1d;
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switch (a)
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{
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case 0: return VideoRead() >> 8;
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case 1: return VideoRead() & 0xff;
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case 4: // control port/status reg
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d = Pico.video.status >> 8;
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if (d&1) Pico.video.status&=~0x100; // FIFO no longer full
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Pico.video.pending = 0;
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elprintf(EL_SR, "SR read (h): %02x @ %06x", d, SekPc);
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return d;
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case 5:
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d = Pico.video.status & 0xff;
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//if (PicoOpt&POPT_ALT_RENDERER) d|=0x0020; // sprite collision (Shadow of the Beast)
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d |= ((Pico.video.reg[1]&0x40)^0x40) >> 3; // set V-Blank if display is disabled
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d |= (Pico.video.pending_ints&0x20)<<2; // V-int pending?
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if (SekCyclesDone() - line_base_cycles >= 488-88) d |= 4; // H-Blank
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Pico.video.pending = 0;
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elprintf(EL_SR, "SR read (l): %02x @ %06x", d, SekPc);
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return d;
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case 8: // hv counter
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elprintf(EL_HVCNT, "vcounter: %02x (%i) @ %06x", Pico.video.v_counter, SekCyclesDone(), SekPc);
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return Pico.video.v_counter;
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case 9:
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d = (SekCyclesDone() - line_base_cycles) & 0x1ff; // FIXME
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if (Pico.video.reg[12]&1)
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d = hcounts_40[d];
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else d = hcounts_32[d];
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elprintf(EL_HVCNT, "hcounter: %02x (%i) @ %06x", d, SekCyclesDone(), SekPc);
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return d;
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}
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return 0;
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}
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// vim:shiftwidth=2:ts=2:expandtab
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