RaySollium99/picodrive
1
0
Fork 0
mirror of https://github.com/RaySollium99/picodrive.git synced 2025-09-05 07:17:45 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions
picodrive/pico/videoport.c

608 lines
16 KiB
C
Raw Blame History

/*
* PicoDrive
* (c) Copyright Dave, 2004
* (C) notaz, 2006-2009
*
* This work is licensed under the terms of MAME license.
* See COPYING file in the top-level directory.
*/
#include "pico_int.h"
#define NEED_DMA_SOURCE
#include "memory.h"
extern const unsigned char hcounts_32[];
extern const unsigned char hcounts_40[];
int (*PicoDmaHook)(unsigned int source, int len, unsigned short **base, unsigned int *mask) = NULL;
static __inline void AutoIncrement(void)
{
Pico.video.addr=(unsigned short)(Pico.video.addr+Pico.video.reg[0xf]);
}
static NOINLINE void VideoWrite128(u32 a, u16 d)
{
// nasty
a = ((a & 2) >> 1) | ((a & 0x400) >> 9) | (a & 0x3FC) | ((a & 0x1F800) >> 1);
((u8 *)PicoMem.vram)[a] = d;
}
static void VideoWrite(u16 d)
{
unsigned int a = Pico.video.addr;
switch (Pico.video.type)
{
case 1: if (a & 1)
d = (u16)((d << 8) | (d >> 8));
PicoMem.vram [(a >> 1) & 0x7fff] = d;
if (a - ((unsigned)(Pico.video.reg[5]&0x7f) << 9) < 0x400)
Pico.est.rendstatus |= PDRAW_DIRTY_SPRITES;
break;
case 3: if (PicoMem.cram [(a >> 1) & 0x3f] != d) Pico.m.dirtyPal = 1;
PicoMem.cram [(a >> 1) & 0x3f] = d; break;
case 5: PicoMem.vsram[(a >> 1) & 0x3f] = d; break;
case 0x81:
a |= Pico.video.addr_u << 16;
VideoWrite128(a, d);
break;
//default:elprintf(EL_ANOMALY, "VDP write %04x with bad type %i", d, Pico.video.type); break;
}
AutoIncrement();
}
static unsigned int VideoRead(void)
{
unsigned int a=0,d=0;
a=Pico.video.addr; a>>=1;
switch (Pico.video.type)
{
case 0: d=PicoMem.vram [a & 0x7fff]; break;
case 8: d=PicoMem.cram [a & 0x003f]; break;
case 4: d=PicoMem.vsram[a & 0x003f]; break;
default:elprintf(EL_ANOMALY, "VDP read with bad type %i", Pico.video.type); break;
}
AutoIncrement();
return d;
}
static int GetDmaLength(void)
{
struct PicoVideo *pvid=&Pico.video;
int len=0;
// 16-bit words to transfer:
len =pvid->reg[0x13];
len|=pvid->reg[0x14]<<8;
len = ((len - 1) & 0xffff) + 1;
return len;
}
static void DmaSlow(int len, unsigned int source)
{
u32 inc = Pico.video.reg[0xf];
u32 a = Pico.video.addr;
u16 *r, *base = NULL;
u32 mask = 0x1ffff;
elprintf(EL_VDPDMA, "DmaSlow[%i] %06x->%04x len %i inc=%i blank %i [%u] @ %06x",
Pico.video.type, source, a, len, inc, (Pico.video.status&8)||!(Pico.video.reg[1]&0x40),
SekCyclesDone(), SekPc);
Pico.m.dma_xfers = len;
if (Pico.m.dma_xfers < len) // lame 16bit var
Pico.m.dma_xfers = ~0;
SekCyclesBurnRun(CheckDMA());
if ((source & 0xe00000) == 0xe00000) { // Ram
base = (u16 *)PicoMem.ram;
mask = 0xffff;
}
else if (PicoIn.AHW & PAHW_MCD)
{
u8 r3 = Pico_mcd->s68k_regs[3];
elprintf(EL_VDPDMA, "DmaSlow CD, r3=%02x", r3);
if (source < 0x20000) { // Bios area
base = (u16 *)Pico_mcd->bios;
} else if ((source & 0xfc0000) == 0x200000) { // Word Ram
if (!(r3 & 4)) { // 2M mode
base = (u16 *)(Pico_mcd->word_ram2M + (source & 0x20000));
} else {
if (source < 0x220000) { // 1M mode
int bank = r3 & 1;
base = (u16 *)(Pico_mcd->word_ram1M[bank]);
} else {
DmaSlowCell(source - 2, a, len, inc);
return;
}
}
source -= 2;
} else if ((source & 0xfe0000) == 0x020000) { // Prg Ram
base = (u16 *)Pico_mcd->prg_ram_b[r3 >> 6];
source -= 2; // XXX: test
}
}
else
{
// if we have DmaHook, let it handle ROM because of possible DMA delay
u32 source2;
if (PicoDmaHook && (source2 = PicoDmaHook(source, len, &base, &mask)))
source = source2;
else // Rom
base = m68k_dma_source(source);
}
if (!base) {
elprintf(EL_VDPDMA|EL_ANOMALY, "DmaSlow[%i] %06x->%04x: invalid src", Pico.video.type, source, a);
return;
}
// operate in words
source >>= 1;
mask >>= 1;
switch (Pico.video.type)
{
case 1: // vram
r = PicoMem.vram;
if (inc == 2 && !(a & 1) && a + len * 2 < 0x10000
&& !(((source + len - 1) ^ source) & ~mask))
{
// most used DMA mode
memcpy((char *)r + a, base + (source & mask), len * 2);
a += len * 2;
}
else
{
for(; len; len--)
{
u16 d = base[source++ & mask];
if(a & 1) d=(d<<8)|(d>>8);
r[a >> 1] = d;
// AutoIncrement
a = (u16)(a + inc);
}
}
Pico.est.rendstatus |= PDRAW_DIRTY_SPRITES;
break;
case 3: // cram
Pico.m.dirtyPal = 1;
r = PicoMem.cram;
for (; len; len--)
{
r[(a / 2) & 0x3f] = base[source++ & mask];
// AutoIncrement
a += inc;
}
break;
case 5: // vsram
r = PicoMem.vsram;
for (; len; len--)
{
r[(a / 2) & 0x3f] = base[source++ & mask];
// AutoIncrement
a += inc;
}
break;
case 0x81: // vram 128k
a |= Pico.video.addr_u << 16;
for(; len; len--)
{
VideoWrite128(a, base[source++ & mask]);
// AutoIncrement
a = (a + inc) & 0x1ffff;
}
Pico.video.addr_u = a >> 16;
break;
default:
if (Pico.video.type != 0 || (EL_LOGMASK & EL_VDPDMA))
elprintf(EL_VDPDMA|EL_ANOMALY, "DMA with bad type %i", Pico.video.type);
break;
}
// remember addr
Pico.video.addr=(u16)a;
}
static void DmaCopy(int len)
{
u16 a = Pico.video.addr;
u8 *vr = (u8 *)PicoMem.vram;
u8 inc = Pico.video.reg[0xf];
int source;
elprintf(EL_VDPDMA, "DmaCopy len %i [%u]", len, SekCyclesDone());
Pico.m.dma_xfers = len;
if (Pico.m.dma_xfers < len)
Pico.m.dma_xfers = ~0;
Pico.video.status |= SR_DMA;
source =Pico.video.reg[0x15];
source|=Pico.video.reg[0x16]<<8;
for (; len; len--)
{
vr[a] = vr[source++ & 0xffff];
// AutoIncrement
a=(u16)(a+inc);
}
// remember addr
Pico.video.addr=a;
Pico.est.rendstatus |= PDRAW_DIRTY_SPRITES;
}
static NOINLINE void DmaFill(int data)
{
u16 a = Pico.video.addr;
u8 *vr = (u8 *)PicoMem.vram;
u8 high = (u8)(data >> 8);
u8 inc = Pico.video.reg[0xf];
int source;
int len, l;
len = GetDmaLength();
elprintf(EL_VDPDMA, "DmaFill len %i inc %i [%u]", len, inc, SekCyclesDone());
Pico.m.dma_xfers = len;
if (Pico.m.dma_xfers < len) // lame 16bit var
Pico.m.dma_xfers = ~0;
Pico.video.status |= SR_DMA;
switch (Pico.video.type)
{
case 1: // vram
for (l = len; l; l--) {
// Write upper byte to adjacent address
// (here we are byteswapped, so address is already 'adjacent')
vr[a] = high;
// Increment address register
a = (u16)(a + inc);
}
break;
case 3: // cram
case 5: { // vsram
// TODO: needs fifo; anyone using these?
static int once;
if (!once++)
elprintf(EL_STATUS|EL_ANOMALY|EL_VDPDMA, "TODO: cram/vsram fill");
}
default:
a += len * inc;
break;
}
// remember addr
Pico.video.addr = a;
// register update
Pico.video.reg[0x13] = Pico.video.reg[0x14] = 0;
source = Pico.video.reg[0x15];
source |= Pico.video.reg[0x16] << 8;
source += len;
Pico.video.reg[0x15] = source;
Pico.video.reg[0x16] = source >> 8;
Pico.est.rendstatus |= PDRAW_DIRTY_SPRITES;
}
static NOINLINE void CommandDma(void)
{
struct PicoVideo *pvid=&Pico.video;
u32 len, method;
u32 source;
if ((pvid->reg[1]&0x10)==0) return; // DMA not enabled
if (Pico.m.dma_xfers)
elprintf(EL_VDPDMA, "Dma overlap, left=%d @ %06x",
Pico.m.dma_xfers, SekPc);
len = GetDmaLength();
source =Pico.video.reg[0x15];
source|=Pico.video.reg[0x16] << 8;
source|=Pico.video.reg[0x17] << 16;
method=pvid->reg[0x17]>>6;
if (method < 2)
DmaSlow(len, source << 1); // 68000 to VDP
else if (method == 3)
DmaCopy(len); // VRAM Copy
else
return;
source += len;
Pico.video.reg[0x13] = Pico.video.reg[0x14] = 0;
Pico.video.reg[0x15] = source;
Pico.video.reg[0x16] = source >> 8;
}
static NOINLINE void CommandChange(void)
{
struct PicoVideo *pvid = &Pico.video;
unsigned int cmd, addr;
cmd = pvid->command;
// Get type of transfer 0xc0000030 (v/c/vsram read/write)
pvid->type = (u8)(((cmd >> 2) & 0xc) | (cmd >> 30));
if (pvid->type == 1) // vram
pvid->type |= pvid->reg[1] & 0x80; // 128k
// Get address 0x3fff0003
addr = (cmd >> 16) & 0x3fff;
addr |= (cmd << 14) & 0xc000;
pvid->addr = (u16)addr;
pvid->addr_u = (u8)((cmd >> 2) & 1);
}
static void DrawSync(int blank_on)
{
if (Pico.m.scanline < 224 && !(PicoIn.opt & POPT_ALT_RENDERER) &&
!PicoIn.skipFrame && Pico.est.DrawScanline <= Pico.m.scanline) {
//elprintf(EL_ANOMALY, "sync");
PicoDrawSync(Pico.m.scanline, blank_on);
}
}
PICO_INTERNAL_ASM void PicoVideoWrite(unsigned int a,unsigned short d)
{
struct PicoVideo *pvid=&Pico.video;
//elprintf(EL_STATUS, "PicoVideoWrite [%06x] %04x [%u] @ %06x",
// a, d, SekCyclesDone(), SekPc);
a &= 0x1c;
switch (a)
{
case 0x00: // Data port 0 or 2
// try avoiding the sync..
if (Pico.m.scanline < 224 && (pvid->reg[1]&0x40) &&
!(!pvid->pending &&
((pvid->command & 0xc00000f0) == 0x40000010 && PicoMem.vsram[pvid->addr>>1] == d))
)
DrawSync(0);
if (pvid->pending) {
CommandChange();
pvid->pending=0;
}
if (!(pvid->status & SR_VB) && !(PicoIn.opt&POPT_DIS_VDP_FIFO))
{
int use = pvid->type == 1 ? 2 : 1;
pvid->lwrite_cnt -= use;
if (pvid->lwrite_cnt < 0)
SekCyclesLeft = 0;
elprintf(EL_ASVDP, "VDP data write: [%04x] %04x [%u] {%i} #%i @ %06x",
Pico.video.addr, d, SekCyclesDone(), Pico.video.type, pvid->lwrite_cnt, SekPc);
}
VideoWrite(d);
if ((pvid->command&0x80) && (pvid->reg[1]&0x10) && (pvid->reg[0x17]>>6)==2)
DmaFill(d);
break;
case 0x04: // Control (command) port 4 or 6
if (pvid->pending)
{
// Low word of command:
pvid->command &= 0xffff0000;
pvid->command |= d;
pvid->pending = 0;
CommandChange();
// Check for dma:
if (d & 0x80) {
DrawSync(0);
CommandDma();
}
}
else
{
if ((d&0xc000)==0x8000)
{
// Register write:
int num=(d>>8)&0x1f;
int dold=pvid->reg[num];
int blank_on = 0;
pvid->type=0; // register writes clear command (else no Sega logo in Golden Axe II)
if (num > 0x0a && !(pvid->reg[1]&4)) {
elprintf(EL_ANOMALY, "%02x written to reg %02x in SMS mode @ %06x", d, num, SekPc);
return;
}
if (num == 1 && !(d&0x40) && SekCyclesDone() - Pico.t.m68c_line_start <= 488-390)
blank_on = 1;
DrawSync(blank_on);
pvid->reg[num]=(unsigned char)d;
switch (num)
{
case 0x00:
elprintf(EL_INTSW, "hint_onoff: %i->%i [%u] pend=%i @ %06x", (dold&0x10)>>4,
(d&0x10)>>4, SekCyclesDone(), (pvid->pending_ints&0x10)>>4, SekPc);
goto update_irq;
case 0x01:
elprintf(EL_INTSW, "vint_onoff: %i->%i [%u] pend=%i @ %06x", (dold&0x20)>>5,
(d&0x20)>>5, SekCyclesDone(), (pvid->pending_ints&0x20)>>5, SekPc);
if (!(pvid->status & PVS_VB2))
pvid->status &= ~SR_VB;
pvid->status |= ((d >> 3) ^ SR_VB) & SR_VB; // forced blanking
goto update_irq;
case 0x05:
//elprintf(EL_STATUS, "spritep moved to %04x", (unsigned)(Pico.video.reg[5]&0x7f) << 9);
if (d^dold) Pico.est.rendstatus |= PDRAW_SPRITES_MOVED;
break;
case 0x0c:
// renderers should update their palettes if sh/hi mode is changed
if ((d^dold)&8) Pico.m.dirtyPal = 1;
break;
}
return;
update_irq:
#ifndef EMU_CORE_DEBUG
// update IRQ level
if (!SekShouldInterrupt()) // hack
{
int lines, pints, irq = 0;
lines = (pvid->reg[1] & 0x20) | (pvid->reg[0] & 0x10);
pints = pvid->pending_ints & lines;
if (pints & 0x20) irq = 6;
else if (pints & 0x10) irq = 4;
SekInterrupt(irq); // update line
// this is broken because cost of current insn isn't known here
if (irq) SekEndRun(21); // make it delayed
}
#endif
}
else
{
// High word of command:
pvid->command&=0x0000ffff;
pvid->command|=d<<16;
pvid->pending=1;
}
}
break;
// case 0x08: // 08 0a - HV counter - lock up
// case 0x0c: // 0c 0e - HV counter - lock up
// case 0x10: // 10 12 - PSG - handled by caller
// case 0x14: // 14 16 - PSG - handled by caller
// case 0x18: // 18 1a - no effect?
case 0x1c: // 1c 1e - debug
pvid->debug = d;
pvid->debug_p = 0;
if (d & (1 << 6)) {
pvid->debug_p |= PVD_KILL_A | PVD_KILL_B;
pvid->debug_p |= PVD_KILL_S_LO | PVD_KILL_S_HI;
}
switch ((d >> 7) & 3) {
case 1:
pvid->debug_p &= ~(PVD_KILL_S_LO | PVD_KILL_S_HI);
pvid->debug_p |= PVD_FORCE_S;
break;
case 2:
pvid->debug_p &= ~PVD_KILL_A;
pvid->debug_p |= PVD_FORCE_A;
break;
case 3:
pvid->debug_p &= ~PVD_KILL_B;
pvid->debug_p |= PVD_FORCE_B;
break;
}
break;
}
}
static u32 SrLow(const struct PicoVideo *pv)
{
unsigned int c, d = pv->status;
c = SekCyclesDone() - Pico.t.m68c_line_start - 39;
if (c < 92)
d |= SR_HB;
return d;
}
PICO_INTERNAL_ASM unsigned int PicoVideoRead(unsigned int a)
{
a &= 0x1c;
if (a == 0x04) // control port
{
struct PicoVideo *pv = &Pico.video;
unsigned int d = SrLow(pv);
pv->pending = 0;
elprintf(EL_SR, "SR read: %04x [%u] @ %06x", d, SekCyclesDone(), SekPc);
return d;
}
// 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 d;
d = (SekCyclesDone() - Pico.t.m68c_line_start) & 0x1ff; // FIXME
if (Pico.video.reg[12]&1)
d = hcounts_40[d];
else d = hcounts_32[d];
elprintf(EL_HVCNT, "hv: %02x %02x [%u] @ %06x", d, Pico.video.v_counter, SekCyclesDone(), SekPc);
return d | (Pico.video.v_counter << 8);
}
if (a==0x00) // data port
{
return VideoRead();
}
return 0;
}
unsigned char PicoVideoRead8DataH(void)
{
return VideoRead() >> 8;
}
unsigned char PicoVideoRead8DataL(void)
{
return VideoRead();
}
unsigned char PicoVideoRead8CtlH(void)
{
u8 d = (u8)(Pico.video.status >> 8);
Pico.video.pending = 0;
elprintf(EL_SR, "SR read (h): %02x @ %06x", d, SekPc);
return d;
}
unsigned char PicoVideoRead8CtlL(void)
{
u8 d = SrLow(&Pico.video);
Pico.video.pending = 0;
elprintf(EL_SR, "SR read (l): %02x @ %06x", d, SekPc);
return d;
}
unsigned char PicoVideoRead8HV_H(void)
{
elprintf(EL_HVCNT, "vcounter: %02x [%u] @ %06x", Pico.video.v_counter, SekCyclesDone(), SekPc);
return Pico.video.v_counter;
}
// FIXME: broken
unsigned char PicoVideoRead8HV_L(void)
{
u32 d = (SekCyclesDone() - Pico.t.m68c_line_start) & 0x1ff; // FIXME
if (Pico.video.reg[12]&1)
d = hcounts_40[d];
else d = hcounts_32[d];
elprintf(EL_HVCNT, "hcounter: %02x [%u] @ %06x", d, SekCyclesDone(), SekPc);
return d;
}
// vim:shiftwidth=2:ts=2:expandtab
Reference in a new issue View git blame Copy permalink