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fceux/src/ppu.cpp

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/* FCE Ultra - NES/Famicom Emulator
*
* Copyright notice for this file:
* Copyright (C) 1998 BERO
* Copyright (C) 2003 Xodnizel
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "types.h"
#include "x6502.h"
#include "fceu.h"
#include "ppu.h"
#include "nsf.h"
#include "sound.h"
#include "file.h"
#include "utils/endian.h"
#include "utils/memory.h"
#include "cart.h"
#include "palette.h"
#include "state.h"
#include "video.h"
#include "input.h"
#include "driver.h"
#define VBlankON (PPU[0]&0x80) //Generate VBlank NMI
#define Sprite16 (PPU[0]&0x20) //Sprites 8x16/8x8
#define BGAdrHI (PPU[0]&0x10) //BG pattern adr $0000/$1000
#define SpAdrHI (PPU[0]&0x08) //Sprite pattern adr $0000/$1000
#define INC32 (PPU[0]&0x04) //auto increment 1/32
#define SpriteON (PPU[1]&0x10) //Show Sprite
#define ScreenON (PPU[1]&0x08) //Show screen
#define PPUON (PPU[1]&0x18) //PPU should operate
#define GRAYSCALE (PPU[1]&0x01) //Grayscale (AND palette entries with 0x30)
#define SpriteLeft8 (PPU[1]&0x04)
#define BGLeft8 (PPU[1]&0x02)
#define PPU_status (PPU[2])
#define Pal (PALRAM)
static void FetchSpriteData(void);
static void RefreshLine(int lastpixel);
static void RefreshSprites(void);
static void CopySprites(uint8 *target);
static void Fixit1(void);
static uint32 ppulut1[256];
static uint32 ppulut2[256];
static uint32 ppulut3[128];
PPUPHASE ppuphase;
int test = 0;
template<typename T, int BITS>
struct BITREVLUT {
T* lut;
BITREVLUT() {
int bits = BITS;
int n = 1<<BITS;
lut = new T[n];
int m = 1;
int a = n>>1;
int j = 2;
lut[0] = 0;
lut[1] = a;
while(--bits) {
m <<= 1;
a >>= 1;
for(int i=0;i<m;i++)
lut[j++] = lut[i] + a;
}
}
T operator[](int index) { return lut[index]; }
};
BITREVLUT<uint8,8> bitrevlut;
int cpu_ignore;
struct PPUSTATUS
{
int sl;
int cycle, end_cycle;
};
struct SPRITE_READ
{
int num;
int count;
int fetch;
int found;
int found_pos[8];
int ret;
int last;
int mode;
};
struct SPRITE_READ spr_read = { 0 };
//uses the internal counters concept at http://nesdev.icequake.net/PPU%20addressing.txt
struct PPUREGS {
uint32 fv;//3
uint32 v;//1
uint32 h;//1
uint32 vt;//5
uint32 ht;//5
uint32 fh;//3
uint32 s;//1
uint32 par;//8
uint32 ar;//2
uint32 _fv, _v, _h, _vt, _ht;
struct PPUSTATUS status;
PPUREGS()
: fv(0), v(0), h(0), vt(0), ht(0), fh(0), s(0), par(0), ar(0)
, _fv(0), _v(0), _h(0), _vt(0), _ht(0)
{ status.cycle = 0; status.end_cycle = 341;
status.sl = 241;
}
void install_latches() {
fv = _fv;
v = _v;
h = _h;
vt = _vt;
ht = _ht;
}
void install_h_latches() {
ht = _ht;
h = _h;
}
void clear_latches() {
_fv = _v = _h = _vt = _ht = 0;
fh = 0;
}
void increment_hsc() {
//The first one, the horizontal scroll counter, consists of 6 bits, and is
//made up by daisy-chaining the HT counter to the H counter. The HT counter is
//then clocked every 8 pixel dot clocks (or every 8/3 CPU clock cycles).
ht++;
h += (ht>>5);
ht &= 31;
h &= 1;
}
void increment_vs() {
fv++;
vt += (fv>>3);
v += (vt==30)?1:0;
fv &= 7;
if(vt==30) vt=0;
v &= 1;
}
uint32 get_ntread() {
return 0x2000 | (v<<0xB) | (h<<0xA) | (vt<<5) | ht;
}
uint32 get_2007access() {
return ((fv&3)<<0xC) | (v<<0xB) | (h<<0xA) | (vt<<5) | ht;
}
//The PPU has an internal 4-position, 2-bit shifter, which it uses for
//obtaining the 2-bit palette select data during an attribute table byte
//fetch. To represent how this data is shifted in the diagram, letters a..c
//are used in the diagram to represent the right-shift position amount to
//apply to the data read from the attribute data (a is always 0). This is why
//you only see bits 0 and 1 used off the read attribute data in the diagram.
uint32 get_atread() {
return 0x2000 | (v<<0xB) | (h<<0xA) | 0x3C0 | ((vt&0x1C)<<1) | ((ht&0x1C)>>2);
}
//address line 3 relates to the pattern table fetch occuring (the PPU always makes them in pairs).
uint32 get_ptread() {
return (s<<0xC) | (par<<0x4) | fv;
}
void increment2007(bool by32) {
//If the VRAM address increment bit (2000.2) is clear (inc. amt. = 1), all the
//scroll counters are daisy-chained (in the order of HT, VT, H, V, FV) so that
//the carry out of each counter controls the next counter's clock rate. The
//result is that all 5 counters function as a single 15-bit one. Any access to
//2007 clocks the HT counter here.
//
//If the VRAM address increment bit is set (inc. amt. = 32), the only
//difference is that the HT counter is no longer being clocked, and the VT
//counter is now being clocked by access to 2007.
if(by32) {
vt++;
} else {
ht++;
vt+=(ht>>5)&1;
}
h+=(vt>>5);
v+=(h>>1);
fv+=(v>>1);
ht &= 31;
vt &= 31;
h &= 1;
v &= 1;
fv &= 7;
}
} ppur;
static void makeppulut(void)
{
int x;
int y;
int cc,xo,pixel;
for(x=0;x<256;x++)
{
ppulut1[x] = 0;
for(y=0;y<8;y++)
{
ppulut1[x] |= ((x>>(7-y))&1)<<(y*4);
}
ppulut2[x] = ppulut1[x] << 1;
}
for(cc=0;cc<16;cc++)
{
for(xo=0;xo<8;xo++)
{
ppulut3[ xo | ( cc << 3 ) ] = 0;
for(pixel=0;pixel<8;pixel++)
{
int shiftr;
shiftr = ( pixel + xo ) / 8;
shiftr *= 2;
ppulut3[ xo | (cc<<3) ] |= ( ( cc >> shiftr ) & 3 ) << ( 2 + pixel * 4 );
}
// printf("%08x\n",ppulut3[xo|(cc<<3)]);
}
}
}
static int ppudead=1;
static int kook=0;
int fceuindbg=0;
//mbg 6/23/08
//make the no-bg fill color configurable
//0xFF shall indicate to use palette[0]
uint8 gNoBGFillColor = 0xFF;
int MMC5Hack=0;
uint32 MMC5HackVROMMask=0;
uint8 *MMC5HackExNTARAMPtr=0;
uint8 *MMC5HackVROMPTR=0;
uint8 MMC5HackCHRMode=0;
uint8 MMC5HackSPMode=0;
uint8 MMC50x5130=0;
uint8 MMC5HackSPScroll=0;
uint8 MMC5HackSPPage=0;
uint8 VRAMBuffer=0,PPUGenLatch=0;
uint8 *vnapage[4];
uint8 PPUNTARAM=0;
uint8 PPUCHRRAM=0;
//Color deemphasis emulation. Joy...
static uint8 deemp=0;
static int deempcnt[8];
void (*GameHBIRQHook)(void), (*GameHBIRQHook2)(void);
void (*PPU_hook)(uint32 A);
uint8 vtoggle=0;
uint8 XOffset=0;
uint32 TempAddr=0,RefreshAddr=0;
static int maxsprites=8;
//scanline is equal to the current visible scanline we're on.
int scanline;
static uint32 scanlines_per_frame;
uint8 PPU[4];
uint8 PPUSPL;
uint8 NTARAM[0x800],PALRAM[0x20],SPRAM[0x100],SPRBUF[0x100];
uint8 UPALRAM[0x03]; //for 0x4/0x8/0xC addresses in palette, the ones in
//0x20 are 0 to not break fceu rendering.
#define MMC5SPRVRAMADR(V) &MMC5SPRVPage[(V)>>10][(V)]
#define VRAMADR(V) &VPage[(V)>>10][(V)]
//mbg 8/6/08 - fix a bug relating to
//"When in 8x8 sprite mode, only one set is used for both BG and sprites."
//in mmc5 docs
uint8 * MMC5BGVRAMADR(uint32 V) {
if(!Sprite16) {
extern uint8 mmc5ABMode; /* A=0, B=1 */
if(mmc5ABMode==0)
return MMC5SPRVRAMADR(V);
else
return &MMC5BGVPage[(V)>>10][(V)];
} else return &MMC5BGVPage[(V)>>10][(V)];
}
//this duplicates logic which is embedded in the ppu rendering code
//which figures out where to get CHR data from depending on various hack modes
//mostly involving mmc5.
//this might be incomplete.
uint8* FCEUPPU_GetCHR(uint32 vadr, uint32 refreshaddr) {
if(MMC5Hack) {
if(MMC5HackCHRMode==1) {
uint8 *C = MMC5HackVROMPTR;
C += (((MMC5HackExNTARAMPtr[refreshaddr & 0x3ff]) & 0x3f & MMC5HackVROMMask) << 12) + (vadr & 0xfff);
C += (MMC50x5130&0x3)<<18; //11-jun-2009 for kuja_killer
return C;
} else {
return MMC5BGVRAMADR(vadr);
}
}
else return VRAMADR(vadr);
}
//likewise for ATTR
int FCEUPPU_GetAttr(int ntnum, int xt, int yt) {
int attraddr = 0x3C0+((yt>>2)<<3)+(xt>>2);
int temp = (((yt&2)<<1)+(xt&2));
int refreshaddr = xt+yt*32;
if(MMC5Hack && MMC5HackCHRMode==1)
return (MMC5HackExNTARAMPtr[refreshaddr & 0x3ff] & 0xC0)>>6;
else
return (vnapage[ntnum][attraddr] & (3<<temp)) >> temp;
}
//new ppu-----
inline void FFCEUX_PPUWrite_Default(uint32 A, uint8 V) {
uint32 tmp = A;
if(tmp<0x2000)
{
if(PPUCHRRAM&(1<<(tmp>>10)))
VPage[tmp>>10][tmp]=V;
}
else if (tmp<0x3F00)
{
if(PPUNTARAM&(1<<((tmp&0xF00)>>10)))
vnapage[((tmp&0xF00)>>10)][tmp&0x3FF]=V;
}
else
{
if (!(tmp & 3))
{
if (!(tmp & 0xC))
PALRAM[0x00] = PALRAM[0x04] =
PALRAM[0x08] = PALRAM[0x0C] = V & 0x3F;
else
UPALRAM[((tmp & 0xC) >> 2) - 1] = V & 0x3F;
}
else
PALRAM[tmp & 0x1F] = V & 0x3F;
}
}
uint8 FFCEUX_PPURead_Default(uint32 A) {
uint32 tmp = A;
if(tmp<0x2000)
{
return VPage[tmp>>10][tmp];
}
else if (tmp < 0x3F00)
{
return vnapage[(tmp>>10)&0x3][tmp&0x3FF];
}
else
{
uint8 ret;
if (!(tmp & 3))
{
if (!(tmp & 0xC))
ret = PALRAM[0x00];
else
ret = UPALRAM[((tmp & 0xC) >> 2) - 1];
}
else
ret = PALRAM[tmp & 0x1F];
if (GRAYSCALE)
ret &= 0x30;
return ret;
}
}
uint8 (*FFCEUX_PPURead)(uint32 A) = 0;
void (*FFCEUX_PPUWrite)(uint32 A, uint8 V) = 0;
#define CALL_PPUREAD(A) (FFCEUX_PPURead?FFCEUX_PPURead(A):(\
((A)<0x2000)? \
VPage[(A)>>10][(A)] \
: vnapage[((A)>>10)&0x3][(A)&0x3FF] \
))
#define CALL_PPUWRITE(A,V) (FFCEUX_PPUWrite?FFCEUX_PPUWrite(A,V):FFCEUX_PPUWrite_Default(A,V))
//whether to use the new ppu (new PPU doesn't handle MMC5 extra nametables at all
int newppu = 0;
//---------------
static DECLFR(A2002)
{
if(newppu)
{
//once we thought we clear latches here, but that caused midframe glitches.
//i think we should only reset the state machine for 2005/2006
//ppur.clear_latches();
}
uint8 ret;
FCEUPPU_LineUpdate();
ret = PPU_status;
ret|=PPUGenLatch&0x1F;
#ifdef FCEUDEF_DEBUGGER
if(!fceuindbg)
#endif
{
vtoggle=0;
PPU_status&=0x7F;
PPUGenLatch=ret;
}
return ret;
}
static DECLFR(A2004)
{
if (newppu)
{
if ((ppur.status.sl < 241) && PPUON)
{
/* from cycles 0 to 63, the
* 32 byte OAM buffer gets init
* to 0xFF */
if (ppur.status.cycle < 64)
return spr_read.ret = 0xFF;
else
{
for (int i = spr_read.last;
i != ppur.status.cycle; ++i)
{
if (i < 256)
{
switch (spr_read.mode)
{
case 0:
if (spr_read.count < 2)
spr_read.ret = (PPU[3] & 0xF8)
+ (spr_read.count << 2);
else
spr_read.ret = spr_read.count << 2;
spr_read.found_pos[spr_read.found] =
spr_read.ret;
spr_read.ret = SPRAM[spr_read.ret];
if (i & 1) //odd cycle
{
//see if in range
if ( !((ppur.status.sl - 1 -
spr_read.ret)
& ~(Sprite16 ? 0xF : 0x7)) )
{
++spr_read.found;
spr_read.fetch = 1;
spr_read.mode = 1;
}
else
{
if (++spr_read.count == 64)
{
spr_read.mode = 4;
spr_read.count = 0;
}
else if (spr_read.found == 8)
{
spr_read.fetch = 0;
spr_read.mode = 2;
}
}
}
break;
case 1: //sprite is in range fetch next 3 bytes
if (i & 1)
{
++spr_read.fetch;
if (spr_read.fetch == 4)
{
spr_read.fetch = 1;
if (++spr_read.count == 64)
{
spr_read.count = 0;
spr_read.mode = 4;
}
else if (spr_read.found == 8)
{
spr_read.fetch = 0;
spr_read.mode = 2;
}
else
spr_read.mode = 0;
}
}
if (spr_read.count < 2)
spr_read.ret = (PPU[3] & 0xF8)
+ (spr_read.count << 2);
else
spr_read.ret = spr_read.count << 2;
spr_read.ret = SPRAM[spr_read.ret |
spr_read.fetch];
break;
case 2: //8th sprite fetched
spr_read.ret = SPRAM[(spr_read.count << 2)
| spr_read.fetch];
if (i & 1)
{
if ( !((ppur.status.sl - 1 -
SPRAM[((spr_read.count << 2)
| spr_read.fetch)])
& ~((Sprite16) ? 0xF : 0x7)) )
{
spr_read.fetch = 1;
spr_read.mode = 3;
}
else
{
if (++spr_read.count == 64)
{
spr_read.count = 0;
spr_read.mode = 4;
}
spr_read.fetch =
(spr_read.fetch + 1) & 3;
}
}
spr_read.ret = spr_read.count;
break;
case 3: //9th sprite overflow detected
spr_read.ret = SPRAM[spr_read.count
| spr_read.fetch];
if (i & 1)
{
if (++spr_read.fetch == 4)
{
spr_read.count = (spr_read.count
+ 1) & 63;
spr_read.mode = 4;
}
}
break;
case 4: //read OAM[n][0] until hblank
if (i & 1)
spr_read.count =
(spr_read.count + 1) & 63;
spr_read.fetch = 0;
spr_read.ret = SPRAM[spr_read.count << 2];
break;
}
}
else if (i < 320)
{
spr_read.ret = (i & 0x38) >> 3;
if (spr_read.found < (spr_read.ret + 1))
{
if (spr_read.num)
{
spr_read.ret = SPRAM[252];
spr_read.num = 0;
}
else
spr_read.ret = 0xFF;
}
else if ((i & 7) < 4)
{
spr_read.ret =
SPRAM[spr_read.found_pos[spr_read.ret]
| spr_read.fetch++];
if (spr_read.fetch == 4)
spr_read.fetch = 0;
}
else
spr_read.ret = SPRAM[spr_read.found_pos
[spr_read.ret | 3]];
}
else
{
if (!spr_read.found)
spr_read.ret = SPRAM[252];
else
spr_read.ret = SPRAM[spr_read.found_pos[0]];
break;
}
}
spr_read.last = ppur.status.cycle;
return spr_read.ret;
}
}
else
return SPRAM[PPU[3]];
}
else
{
FCEUPPU_LineUpdate();
return PPUGenLatch;
}
}
static DECLFR(A200x) /* Not correct for $2004 reads. */
{
FCEUPPU_LineUpdate();
return PPUGenLatch;
}
/*
static DECLFR(A2004)
{
uint8 ret;
FCEUPPU_LineUpdate();
ret = SPRAM[PPU[3]];
if(PPUSPL>=8)
{
if(PPU[3]>=8)
ret = SPRAM[PPU[3]];
}
else
{
//printf("$%02x:$%02x\n",PPUSPL,V);
ret = SPRAM[PPUSPL];
}
PPU[3]++;
PPUSPL++;
PPUGenLatch = ret;
printf("%d, %02x\n",scanline,ret);
return(ret);
}
*/
static DECLFR(A2007)
{
uint8 ret;
uint32 tmp=RefreshAddr&0x3FFF;
if(newppu) {
ret = VRAMBuffer;
RefreshAddr = ppur.get_2007access() & 0x3FFF;
if ((RefreshAddr & 0x3F00) == 0x3F00)
{
//if it is in the palette range bypass the
//delayed read, and what gets filled in the temp
//buffer is the address - 0x1000, also
//if grayscale is set then the return is AND with 0x30
//to get a gray color reading
if (!(tmp & 3))
{
if (!(tmp & 0xC))
ret = PALRAM[0x00];
else
ret = UPALRAM[((tmp & 0xC) >> 2) - 1];
}
else
ret = PALRAM[tmp & 0x1F];
if (GRAYSCALE)
ret &= 0x30;
VRAMBuffer = CALL_PPUREAD(RefreshAddr - 0x1000);
}
else
VRAMBuffer = CALL_PPUREAD(RefreshAddr);
ppur.increment2007(INC32!=0);
RefreshAddr = ppur.get_2007access();
return ret;
} else {
FCEUPPU_LineUpdate();
ret=VRAMBuffer;
#ifdef FCEUDEF_DEBUGGER
if(!fceuindbg)
#endif
{
if(PPU_hook) PPU_hook(tmp);
PPUGenLatch=VRAMBuffer;
if(tmp<0x2000)
{
VRAMBuffer=VPage[tmp>>10][tmp];
}
else if (tmp < 0x3F00)
{
VRAMBuffer=vnapage[(tmp>>10)&0x3][tmp&0x3FF];
}
}
#ifdef FCEUDEF_DEBUGGER
if(!fceuindbg)
#endif
{
if(INC32) RefreshAddr+=32;
else RefreshAddr++;
if(PPU_hook) PPU_hook(RefreshAddr&0x3fff);
}
return ret;
}
}
static DECLFW(B2000)
{
// FCEU_printf("%04x:%02x, (%d) %02x, %02x\n",A,V,scanline,PPU[0],PPU_status);
FCEUPPU_LineUpdate();
PPUGenLatch=V;
if(!(PPU[0]&0x80) && (V&0x80) && (PPU_status&0x80))
{
// FCEU_printf("Trigger NMI, %d, %d\n",timestamp,ppudead);
TriggerNMI2();
}
PPU[0]=V;
TempAddr&=0xF3FF;
TempAddr|=(V&3)<<10;
ppur._h = V&1;
ppur._v = (V>>1)&1;
ppur.s = (V>>4)&1;
}
static DECLFW(B2001)
{
//printf("%04x:$%02x, %d\n",A,V,scanline);
FCEUPPU_LineUpdate();
PPUGenLatch=V;
PPU[1]=V;
if(V&0xE0)
deemp=V>>5;
}
//
static DECLFW(B2002)
{
PPUGenLatch=V;
}
static DECLFW(B2003)
{
//printf("$%04x:$%02x, %d, %d\n",A,V,timestamp,scanline);
PPUGenLatch=V;
PPU[3]=V;
PPUSPL=V&0x7;
}
static DECLFW(B2004)
{
//printf("Wr: %04x:$%02x\n",A,V);
PPUGenLatch=V;
if (newppu)
{
//the attribute upper bits are not connected
//so AND them out on write, since reading them
//should return 0 in those bits.
if ((PPU[3] & 3) == 2)
V &= 0xE3;
SPRAM[PPU[3]] = V;
PPU[3] = (PPU[3] + 1) & 0xFF;
}
else
{
if(PPUSPL>=8)
{
if(PPU[3]>=8)
SPRAM[PPU[3]]=V;
}
else
{
//printf("$%02x:$%02x\n",PPUSPL,V);
SPRAM[PPUSPL]=V;
}
PPU[3]++;
PPUSPL++;
}
}
static DECLFW(B2005)
{
uint32 tmp=TempAddr;
FCEUPPU_LineUpdate();
PPUGenLatch=V;
if(!vtoggle)
{
tmp&=0xFFE0;
tmp|=V>>3;
XOffset=V&7;
ppur._ht = V>>3;
ppur.fh = V&7;
}
else
{
tmp&=0x8C1F;
tmp|=((V&~0x7)<<2);
tmp|=(V&7)<<12;
ppur._vt = V>>3;
ppur._fv = V&7;
}
TempAddr=tmp;
vtoggle^=1;
}
static DECLFW(B2006)
{
if(!newppu)
FCEUPPU_LineUpdate();
PPUGenLatch=V;
if(!vtoggle)
{
TempAddr&=0x00FF;
TempAddr|=(V&0x3f)<<8;
ppur._vt &= 0x07;
ppur._vt |= (V&0x3)<<3;
ppur._h = (V>>2)&1;
ppur._v = (V>>3)&1;
ppur._fv = (V>>4)&3;
}
else
{
TempAddr&=0xFF00;
TempAddr|=V;
RefreshAddr=TempAddr;
if(PPU_hook)
PPU_hook(RefreshAddr);
//printf("%d, %04x\n",scanline,RefreshAddr);
ppur._vt &= 0x18;
ppur._vt |= (V>>5);
ppur._ht = V&31;
ppur.install_latches();
}
vtoggle^=1;
}
static DECLFW(B2007)
{
uint32 tmp=RefreshAddr&0x3FFF;
if(newppu) {
RefreshAddr = ppur.get_2007access() & 0x3FFF;
CALL_PPUWRITE(RefreshAddr,V);
//printf("%04x ",RefreshAddr);
ppur.increment2007(INC32!=0);
RefreshAddr = ppur.get_2007access();
}
else
{
//printf("%04x ",tmp);
PPUGenLatch=V;
if(tmp>=0x3F00)
{
// hmmm....
if(!(tmp&0xf))
PALRAM[0x00]=PALRAM[0x04]=PALRAM[0x08]=PALRAM[0x0C]=V&0x3F;
else if(tmp&3) PALRAM[(tmp&0x1f)]=V&0x3f;
}
else if(tmp<0x2000)
{
if(PPUCHRRAM&(1<<(tmp>>10)))
VPage[tmp>>10][tmp]=V;
}
else
{
if(PPUNTARAM&(1<<((tmp&0xF00)>>10)))
vnapage[((tmp&0xF00)>>10)][tmp&0x3FF]=V;
}
// FCEU_printf("ppu (%04x) %04x:%04x %d, %d\n",X.PC,RefreshAddr,PPUGenLatch,scanline,timestamp);
if(INC32) RefreshAddr+=32;
else RefreshAddr++;
if(PPU_hook) PPU_hook(RefreshAddr&0x3fff);
}
}
static DECLFW(B4014)
{
uint32 t=V<<8;
int x;
for(x=0;x<256;x++)
X6502_DMW(0x2004,X6502_DMR(t+x));
}
#define PAL(c) ((c)+cc)
#define GETLASTPIXEL (PAL?((timestamp*48-linestartts)/15) : ((timestamp*48-linestartts)>>4) )
static uint8 *Pline,*Plinef;
static int firsttile;
int linestartts; //no longer static so the debugger can see it
static int tofix=0;
static void ResetRL(uint8 *target)
{
memset(target,0xFF,256);
InputScanlineHook(0,0,0,0);
Plinef=target;
Pline=target;
firsttile=0;
linestartts=timestamp*48+X.count;
tofix=0;
FCEUPPU_LineUpdate();
tofix=1;
}
static uint8 sprlinebuf[256+8];
void FCEUPPU_LineUpdate(void)
{
#ifdef FCEUDEF_DEBUGGER
if(!fceuindbg)
#endif
if(Pline)
{
int l=GETLASTPIXEL;
RefreshLine(l);
}
}
static bool rendersprites=true, renderbg=true;
void FCEUI_SetRenderPlanes(bool sprites, bool bg)
{
rendersprites = sprites;
renderbg = bg;
}
void FCEUI_GetRenderPlanes(bool& sprites, bool& bg)
{
sprites = rendersprites;
bg = renderbg;
}
//mbg 6/21/08 - tileview is being ripped out since i dont know how long its been since it worked
//static int tileview=1;
//void FCEUI_ToggleTileView(void)
//{
// tileview^=1;
//}
//mbg 6/21/08 - tileview is being ripped out since i dont know how long its been since it worked
//static void TileView(void)
//{
// uint8 *P=XBuf+16*256;
// int bgh;
// int y;
// int X1;
// for(bgh=0;bgh<2;bgh++)
// for(y=0;y<16*8;y++)
// for(P=XBuf+bgh*128+(16+y)*256,X1=16;X1;X1--,P+=8)
// {
// uint8 *C;
// register uint8 cc;
// uint32 vadr;
//
// vadr=((((16-X1)|((y>>3)<<4))<<4)|(y&7))+bgh*0x1000;
// //C= ROM+vadr+turt*8192;
// C = VRAMADR(vadr);
// //if((vadr+turt*8192)>=524288)
// //printf("%d ",vadr+turt*8192);
// cc=0;
// //#include "pputile.inc"
// }
//}
static void CheckSpriteHit(int p);
static void EndRL(void)
{
RefreshLine(272);
if(tofix)
Fixit1();
CheckSpriteHit(272);
Pline=0;
}
static int32 sphitx;
static uint8 sphitdata;
static void CheckSpriteHit(int p)
{
int l=p-16;
int x;
if(sphitx==0x100) return;
for(x=sphitx;x<(sphitx+8) && x<l;x++)
{
if((sphitdata&(0x80>>(x-sphitx))) && !(Plinef[x]&64))
{
PPU_status|=0x40;
//printf("Ha: %d, %d, Hita: %d, %d, %d, %d, %d\n",p,p&~7,scanline,GETLASTPIXEL-16,&Plinef[x],Pline,Pline-Plinef);
//printf("%d\n",GETLASTPIXEL-16);
//if(Plinef[x] == 0xFF)
//printf("PL: %d, %02x\n",scanline, Plinef[x]);
sphitx=0x100;
break;
}
}
}
//spork the world. Any sprites on this line? Then this will be set to 1.
//Needed for zapper emulation and *gasp* sprite emulation.
static int spork=0;
// lasttile is really "second to last tile."
static void RefreshLine(int lastpixel)
{
static uint32 pshift[2];
static uint32 atlatch;
uint32 smorkus=RefreshAddr;
#define RefreshAddr smorkus
uint32 vofs;
int X1;
register uint8 *P=Pline;
int lasttile=lastpixel>>3;
int numtiles;
static int norecurse=0; /* Yeah, recursion would be bad.
PPU_hook() functions can call
mirroring/chr bank switching functions,
which call FCEUPPU_LineUpdate, which call this
function. */
if(norecurse) return;
if(sphitx != 0x100 && !(PPU_status&0x40))
{
if((sphitx < (lastpixel-16)) && !(sphitx < ((lasttile - 2)*8)))
{
//printf("OK: %d\n",scanline);
lasttile++;
}
}
if(lasttile>34) lasttile=34;
numtiles=lasttile-firsttile;
if(numtiles<=0) return;
P=Pline;
vofs=0;
vofs=((PPU[0]&0x10)<<8) | ((RefreshAddr>>12)&7);
if(!ScreenON && !SpriteON)
{
uint32 tem;
tem=Pal[0]|(Pal[0]<<8)|(Pal[0]<<16)|(Pal[0]<<24);
tem|=0x40404040;
FCEU_dwmemset(Pline,tem,numtiles*8);
P+=numtiles*8;
Pline=P;
firsttile=lasttile;
#define TOFIXNUM (272-0x4)
if(lastpixel>=TOFIXNUM && tofix)
{
Fixit1();
tofix=0;
}
if((lastpixel-16)>=0)
{
InputScanlineHook(Plinef,spork?sprlinebuf:0,linestartts,lasttile*8-16);
}
return;
}
//Priority bits, needed for sprite emulation.
Pal[0]|=64;
Pal[4]|=64;
Pal[8]|=64;
Pal[0xC]|=64;
//This high-level graphics MMC5 emulation code was written for MMC5 carts in "CL" mode.
//It's probably not totally correct for carts in "SL" mode.
#define PPUT_MMC5
if(MMC5Hack && geniestage!=1)
{
if(MMC5HackCHRMode==0 && (MMC5HackSPMode&0x80))
{
int tochange=MMC5HackSPMode&0x1F;
tochange-=firsttile;
for(X1=firsttile;X1<lasttile;X1++)
{
if((tochange<=0 && MMC5HackSPMode&0x40) || (tochange>0 && !(MMC5HackSPMode&0x40)))
{
#define PPUT_MMC5SP
#include "pputile.inc"
#undef PPUT_MMC5SP
}
else
{
#include "pputile.inc"
}
tochange--;
}
}
else if(MMC5HackCHRMode==1 && (MMC5HackSPMode&0x80))
{
int tochange=MMC5HackSPMode&0x1F;
tochange-=firsttile;
#define PPUT_MMC5SP
#define PPUT_MMC5CHR1
for(X1=firsttile;X1<lasttile;X1++)
{
#include "pputile.inc"
}
#undef PPUT_MMC5CHR1
#undef PPUT_MMC5SP
}
else if(MMC5HackCHRMode==1)
{
#define PPUT_MMC5CHR1
for(X1=firsttile;X1<lasttile;X1++)
{
#include "pputile.inc"
}
#undef PPUT_MMC5CHR1
}
else
{
for(X1=firsttile;X1<lasttile;X1++)
{
#include "pputile.inc"
}
}
}
#undef PPUT_MMC5
else if(PPU_hook)
{
norecurse=1;
#define PPUT_HOOK
for(X1=firsttile;X1<lasttile;X1++)
{
#include "pputile.inc"
}
#undef PPUT_HOOK
norecurse=0;
}
else
{
for(X1=firsttile;X1<lasttile;X1++)
{
#include "pputile.inc"
}
}
#undef vofs
#undef RefreshAddr
//Reverse changes made before.
Pal[0]&=63;
Pal[4]&=63;
Pal[8]&=63;
Pal[0xC]&=63;
RefreshAddr=smorkus;
if(firsttile<=2 && 2<lasttile && !(PPU[1]&2))
{
uint32 tem;
tem=Pal[0]|(Pal[0]<<8)|(Pal[0]<<16)|(Pal[0]<<24);
tem|=0x40404040;
*(uint32 *)Plinef=*(uint32 *)(Plinef+4)=tem;
}
if(!ScreenON)
{
uint32 tem;
int tstart,tcount;
tem=Pal[0]|(Pal[0]<<8)|(Pal[0]<<16)|(Pal[0]<<24);
tem|=0x40404040;
tcount=lasttile-firsttile;
tstart=firsttile-2;
if(tstart<0)
{
tcount+=tstart;
tstart=0;
}
if(tcount>0)
FCEU_dwmemset(Plinef+tstart*8,tem,tcount*8);
}
if(lastpixel>=TOFIXNUM && tofix)
{
//puts("Fixed");
Fixit1();
tofix=0;
}
//CheckSpriteHit(lasttile*8); //lasttile*8); //lastpixel);
//This only works right because of a hack earlier in this function.
CheckSpriteHit(lastpixel);
if((lastpixel-16)>=0)
{
InputScanlineHook(Plinef,spork?sprlinebuf:0,linestartts,lasttile*8-16);
}
Pline=P;
firsttile=lasttile;
}
static INLINE void Fixit2(void)
{
if(ScreenON || SpriteON)
{
uint32 rad=RefreshAddr;
rad&=0xFBE0;
rad|=TempAddr&0x041f;
RefreshAddr=rad;
//PPU_hook(RefreshAddr);
//PPU_hook(RefreshAddr,-1);
}
}
static void Fixit1(void)
{
if(ScreenON || SpriteON)
{
uint32 rad=RefreshAddr;
if((rad&0x7000)==0x7000)
{
rad^=0x7000;
if((rad&0x3E0)==0x3A0)
{
rad^=0x3A0;
rad^=0x800;
}
else
{
if((rad&0x3E0)==0x3e0)
rad^=0x3e0;
else rad+=0x20;
}
}
else
rad+=0x1000;
RefreshAddr=rad;
//PPU_hook(RefreshAddr); //,-1);
}
}
void MMC5_hb(int); //Ugh ugh ugh.
static void DoLine(void)
{
int x;
uint8 *target=XBuf+(scanline<<8);
if(MMC5Hack && (ScreenON || SpriteON)) MMC5_hb(scanline);
X6502_Run(256);
EndRL();
if(!renderbg) // User asked to not display background data.
{
uint32 tem;
uint8 col;
if(gNoBGFillColor == 0xFF)
col = Pal[0];
else col = gNoBGFillColor;
tem=col|(col<<8)|(col<<16)|(col<<24);
tem|=0x40404040;
FCEU_dwmemset(target,tem,256);
}
if(SpriteON)
CopySprites(target);
if(ScreenON || SpriteON) // Yes, very el-cheapo.
{
if(PPU[1]&0x01)
{
for(x=63;x>=0;x--)
*(uint32 *)&target[x<<2]=(*(uint32*)&target[x<<2])&0x30303030;
}
}
if((PPU[1]>>5)==0x7)
{
for(x=63;x>=0;x--)
*(uint32 *)&target[x<<2]=((*(uint32*)&target[x<<2])&0x3f3f3f3f)|0xc0c0c0c0;
}
else if(PPU[1]&0xE0)
for(x=63;x>=0;x--)
*(uint32 *)&target[x<<2]=(*(uint32*)&target[x<<2])|0x40404040;
else
for(x=63;x>=0;x--)
*(uint32 *)&target[x<<2]=((*(uint32*)&target[x<<2])&0x3f3f3f3f)|0x80808080;
sphitx=0x100;
if(ScreenON || SpriteON)
FetchSpriteData();
if(GameHBIRQHook && (ScreenON || SpriteON) && ((PPU[0]&0x38)!=0x18))
{
X6502_Run(6);
Fixit2();
X6502_Run(4);
GameHBIRQHook();
X6502_Run(85-16-10);
}
else
{
X6502_Run(6); // Tried 65, caused problems with Slalom(maybe others)
Fixit2();
X6502_Run(85-6-16);
// A semi-hack for Star Trek: 25th Anniversary
if(GameHBIRQHook && (ScreenON || SpriteON) && ((PPU[0]&0x38)!=0x18))
GameHBIRQHook();
}
DEBUG(FCEUD_UpdateNTView(scanline,0));
if(SpriteON)
RefreshSprites();
if(GameHBIRQHook2 && (ScreenON || SpriteON))
GameHBIRQHook2();
scanline++;
if(scanline<240)
{
ResetRL(XBuf+(scanline<<8));
}
X6502_Run(16);
}
#define V_FLIP 0x80
#define H_FLIP 0x40
#define SP_BACK 0x20
typedef struct {
uint8 y,no,atr,x;
} SPR;
typedef struct {
uint8 ca[2],atr,x;
} SPRB;
void FCEUI_DisableSpriteLimitation(int a)
{
maxsprites=a?64:8;
}
static uint8 numsprites,SpriteBlurp;
static void FetchSpriteData(void)
{
uint8 ns,sb;
SPR *spr;
uint8 H;
int n;
int vofs;
uint8 P0=PPU[0];
spr=(SPR *)SPRAM;
H=8;
ns=sb=0;
vofs=(unsigned int)(P0&0x8&(((P0&0x20)^0x20)>>2))<<9;
H+=(P0&0x20)>>2;
if(!PPU_hook)
for(n=63;n>=0;n--,spr++)
{
if((unsigned int)(scanline-spr->y)>=H) continue;
//printf("%d, %u\n",scanline,(unsigned int)(scanline-spr->y));
if(ns<maxsprites)
{
if(n==63) sb=1;
{
SPRB dst;
uint8 *C;
int t;
unsigned int vadr;
t = (int)scanline-(spr->y);
if(Sprite16)
vadr = ((spr->no&1)<<12) + ((spr->no&0xFE)<<4);
else
vadr = (spr->no<<4)+vofs;
if(spr->atr&V_FLIP)
{
vadr+=7;
vadr-=t;
vadr+=(P0&0x20)>>1;
vadr-=t&8;
}
else
{
vadr+=t;
vadr+=t&8;
}
/* Fix this geniestage hack */
if(MMC5Hack && geniestage!=1) C = MMC5SPRVRAMADR(vadr);
else C = VRAMADR(vadr);
dst.ca[0]=C[0];
dst.ca[1]=C[8];
dst.x=spr->x;
dst.atr=spr->atr;
*(uint32 *)&SPRBUF[ns<<2]=*(uint32 *)&dst;
}
ns++;
}
else
{
PPU_status|=0x20;
break;
}
}
else
for(n=63;n>=0;n--,spr++)
{
if((unsigned int)(scanline-spr->y)>=H) continue;
if(ns<maxsprites)
{
if(n==63) sb=1;
{
SPRB dst;
uint8 *C;
int t;
unsigned int vadr;
t = (int)scanline-(spr->y);
if(Sprite16)
vadr = ((spr->no&1)<<12) + ((spr->no&0xFE)<<4);
else
vadr = (spr->no<<4)+vofs;
if(spr->atr&V_FLIP)
{
vadr+=7;
vadr-=t;
vadr+=(P0&0x20)>>1;
vadr-=t&8;
}
else
{
vadr+=t;
vadr+=t&8;
}
if(MMC5Hack) C = MMC5SPRVRAMADR(vadr);
else C = VRAMADR(vadr);
dst.ca[0]=C[0];
if(ns<8)
{
PPU_hook(0x2000);
PPU_hook(vadr);
}
dst.ca[1]=C[8];
dst.x=spr->x;
dst.atr=spr->atr;
*(uint32 *)&SPRBUF[ns<<2]=*(uint32 *)&dst;
}
ns++;
}
else
{
PPU_status|=0x20;
break;
}
}
//if(ns>=7)
//printf("%d %d\n",scanline,ns);
//Handle case when >8 sprites per scanline option is enabled.
if(ns>8) PPU_status|=0x20;
else if(PPU_hook)
{
for(n=0;n<(8-ns);n++)
{
PPU_hook(0x2000);
PPU_hook(vofs);
}
}
numsprites=ns;
SpriteBlurp=sb;
}
static void RefreshSprites(void)
{
int n;
SPRB *spr;
spork=0;
if(!numsprites) return;
FCEU_dwmemset(sprlinebuf,0x80808080,256);
numsprites--;
spr = (SPRB*)SPRBUF+numsprites;
for(n=numsprites;n>=0;n--,spr--)
{
uint32 pixdata;
uint8 J,atr;
int x=spr->x;
uint8 *C;
uint8 *VB;
pixdata=ppulut1[spr->ca[0]]|ppulut2[spr->ca[1]];
J=spr->ca[0]|spr->ca[1];
atr=spr->atr;
if(J)
{
if(n==0 && SpriteBlurp && !(PPU_status&0x40))
{
sphitx=x;
sphitdata=J;
if(atr&H_FLIP)
sphitdata= ((J<<7)&0x80) |
((J<<5)&0x40) |
((J<<3)&0x20) |
((J<<1)&0x10) |
((J>>1)&0x08) |
((J>>3)&0x04) |
((J>>5)&0x02) |
((J>>7)&0x01);
}
C = sprlinebuf+x;
VB = (PALRAM+0x10)+((atr&3)<<2);
if(atr&SP_BACK)
{
if(atr&H_FLIP)
{
if(J&0x80) C[7]=VB[pixdata&3]|0x40;
pixdata>>=4;
if(J&0x40) C[6]=VB[pixdata&3]|0x40;
pixdata>>=4;
if(J&0x20) C[5]=VB[pixdata&3]|0x40;
pixdata>>=4;
if(J&0x10) C[4]=VB[pixdata&3]|0x40;
pixdata>>=4;
if(J&0x08) C[3]=VB[pixdata&3]|0x40;
pixdata>>=4;
if(J&0x04) C[2]=VB[pixdata&3]|0x40;
pixdata>>=4;
if(J&0x02) C[1]=VB[pixdata&3]|0x40;
pixdata>>=4;
if(J&0x01) C[0]=VB[pixdata]|0x40;
} else {
if(J&0x80) C[0]=VB[pixdata&3]|0x40;
pixdata>>=4;
if(J&0x40) C[1]=VB[pixdata&3]|0x40;
pixdata>>=4;
if(J&0x20) C[2]=VB[pixdata&3]|0x40;
pixdata>>=4;
if(J&0x10) C[3]=VB[pixdata&3]|0x40;
pixdata>>=4;
if(J&0x08) C[4]=VB[pixdata&3]|0x40;
pixdata>>=4;
if(J&0x04) C[5]=VB[pixdata&3]|0x40;
pixdata>>=4;
if(J&0x02) C[6]=VB[pixdata&3]|0x40;
pixdata>>=4;
if(J&0x01) C[7]=VB[pixdata]|0x40;
}
} else {
if(atr&H_FLIP)
{
if(J&0x80) C[7]=VB[pixdata&3];
pixdata>>=4;
if(J&0x40) C[6]=VB[pixdata&3];
pixdata>>=4;
if(J&0x20) C[5]=VB[pixdata&3];
pixdata>>=4;
if(J&0x10) C[4]=VB[pixdata&3];
pixdata>>=4;
if(J&0x08) C[3]=VB[pixdata&3];
pixdata>>=4;
if(J&0x04) C[2]=VB[pixdata&3];
pixdata>>=4;
if(J&0x02) C[1]=VB[pixdata&3];
pixdata>>=4;
if(J&0x01) C[0]=VB[pixdata];
}else{
if(J&0x80) C[0]=VB[pixdata&3];
pixdata>>=4;
if(J&0x40) C[1]=VB[pixdata&3];
pixdata>>=4;
if(J&0x20) C[2]=VB[pixdata&3];
pixdata>>=4;
if(J&0x10) C[3]=VB[pixdata&3];
pixdata>>=4;
if(J&0x08) C[4]=VB[pixdata&3];
pixdata>>=4;
if(J&0x04) C[5]=VB[pixdata&3];
pixdata>>=4;
if(J&0x02) C[6]=VB[pixdata&3];
pixdata>>=4;
if(J&0x01) C[7]=VB[pixdata];
}
}
}
}
SpriteBlurp=0;
spork=1;
}
static void CopySprites(uint8 *target)
{
uint8 n=((PPU[1]&4)^4)<<1;
uint8 *P=target;
if(!spork) return;
spork=0;
if(!rendersprites) return; //User asked to not display sprites.
loopskie:
{
uint32 t=*(uint32 *)(sprlinebuf+n);
if(t!=0x80808080)
{
#ifdef LSB_FIRST
if(!(t&0x80))
{
if(!(t&0x40) || (P[n]&0x40)) // Normal sprite || behind bg sprite
P[n]=sprlinebuf[n];
}
if(!(t&0x8000))
{
if(!(t&0x4000) || (P[n+1]&0x40)) // Normal sprite || behind bg sprite
P[n+1]=(sprlinebuf+1)[n];
}
if(!(t&0x800000))
{
if(!(t&0x400000) || (P[n+2]&0x40)) // Normal sprite || behind bg sprite
P[n+2]=(sprlinebuf+2)[n];
}
if(!(t&0x80000000))
{
if(!(t&0x40000000) || (P[n+3]&0x40)) // Normal sprite || behind bg sprite
P[n+3]=(sprlinebuf+3)[n];
}
#else
/* TODO: Simplify */
if(!(t&0x80000000))
{
if(!(t&0x40000000)) // Normal sprite
P[n]=sprlinebuf[n];
else if(P[n]&64) // behind bg sprite
P[n]=sprlinebuf[n];
}
if(!(t&0x800000))
{
if(!(t&0x400000)) // Normal sprite
P[n+1]=(sprlinebuf+1)[n];
else if(P[n+1]&64) // behind bg sprite
P[n+1]=(sprlinebuf+1)[n];
}
if(!(t&0x8000))
{
if(!(t&0x4000)) // Normal sprite
P[n+2]=(sprlinebuf+2)[n];
else if(P[n+2]&64) // behind bg sprite
P[n+2]=(sprlinebuf+2)[n];
}
if(!(t&0x80))
{
if(!(t&0x40)) // Normal sprite
P[n+3]=(sprlinebuf+3)[n];
else if(P[n+3]&64) // behind bg sprite
P[n+3]=(sprlinebuf+3)[n];
}
#endif
}
}
n+=4;
if(n) goto loopskie;
}
void FCEUPPU_SetVideoSystem(int w)
{
if(w)
{
scanlines_per_frame=312;
FSettings.FirstSLine=FSettings.UsrFirstSLine[1];
FSettings.LastSLine=FSettings.UsrLastSLine[1];
}
else
{
scanlines_per_frame=262;
FSettings.FirstSLine=FSettings.UsrFirstSLine[0];
FSettings.LastSLine=FSettings.UsrLastSLine[0];
}
}
//Initializes the PPU
void FCEUPPU_Init(void)
{
makeppulut();
}
void FCEUPPU_Reset(void)
{
VRAMBuffer=PPU[0]=PPU[1]=PPU_status=PPU[3]=0;
PPUSPL=0;
PPUGenLatch=0;
RefreshAddr=TempAddr=0;
vtoggle = 0;
ppudead = 2;
kook = 0;
// XOffset=0;
}
void FCEUPPU_Power(void)
{
int x;
memset(NTARAM,0x00,0x800);
memset(PALRAM,0x00,0x20);
memset(UPALRAM,0x00,0x03);
memset(SPRAM,0x00,0x100);
FCEUPPU_Reset();
for(x=0x2000;x<0x4000;x+=8)
{
ARead[x]=A200x;
BWrite[x]=B2000;
ARead[x+1]=A200x;
BWrite[x+1]=B2001;
ARead[x+2]=A2002;
BWrite[x+2]=B2002;
ARead[x+3]=A200x;
BWrite[x+3]=B2003;
ARead[x+4]=A2004; //A2004;
BWrite[x+4]=B2004;
ARead[x+5]=A200x;
BWrite[x+5]=B2005;
ARead[x+6]=A200x;
BWrite[x+6]=B2006;
ARead[x+7]=A2007;
BWrite[x+7]=B2007;
}
BWrite[0x4014]=B4014;
}
int FCEUPPU_Loop(int skip)
{
if(newppu) {
int FCEUX_PPU_Loop(int skip);
return FCEUX_PPU_Loop(skip);
}
//Needed for Knight Rider, possibly others.
if(ppudead)
{
memset(XBuf, 0x80, 256*240);
X6502_Run(scanlines_per_frame*(256+85));
ppudead--;
}
else
{
X6502_Run(256+85);
PPU_status |= 0x80;
//Not sure if this is correct. According to Matt Conte and my own tests, it is.
//Timing is probably off, though.
//NOTE: Not having this here breaks a Super Donkey Kong game.
PPU[3]=PPUSPL=0;
//I need to figure out the true nature and length of this delay.
X6502_Run(12);
if(GameInfo->type==GIT_NSF)
DoNSFFrame();
else
{
if(VBlankON)
TriggerNMI();
}
X6502_Run((scanlines_per_frame-242)*(256+85)-12); //-12);
PPU_status&=0x1f;
X6502_Run(256);
{
int x;
if(ScreenON || SpriteON)
{
if(GameHBIRQHook && ((PPU[0]&0x38)!=0x18))
GameHBIRQHook();
if(PPU_hook)
for(x=0;x<42;x++) {PPU_hook(0x2000); PPU_hook(0);}
if(GameHBIRQHook2)
GameHBIRQHook2();
}
X6502_Run(85-16);
if(ScreenON || SpriteON)
{
RefreshAddr=TempAddr;
if(PPU_hook) PPU_hook(RefreshAddr&0x3fff);
}
//Clean this stuff up later.
spork=numsprites=0;
ResetRL(XBuf);
X6502_Run(16-kook);
kook ^= 1;
}
if(GameInfo->type==GIT_NSF)
X6502_Run((256+85)*240);
#ifdef FRAMESKIP
else if(skip)
{
int y;
y=SPRAM[0];
y++;
PPU_status|=0x20; // Fixes "Bee 52". Does it break anything?
if(GameHBIRQHook)
{
X6502_Run(256);
for(scanline=0;scanline<240;scanline++)
{
if(ScreenON || SpriteON)
GameHBIRQHook();
if(scanline==y && SpriteON) PPU_status|=0x40;
X6502_Run((scanline==239)?85:(256+85));
}
}
else if(y<240)
{
X6502_Run((256+85)*y);
if(SpriteON) PPU_status|=0x40; // Quick and very dirty hack.
X6502_Run((256+85)*(240-y));
}
else
X6502_Run((256+85)*240);
}
#endif
else
{
int x,max,maxref;
deemp=PPU[1]>>5;
for(scanline=0;scanline<240;) //scanline is incremented in DoLine. Evil. :/
{
deempcnt[deemp]++;
DEBUG(FCEUD_UpdatePPUView(scanline, 1));
DoLine();
}
if(MMC5Hack && (ScreenON || SpriteON)) MMC5_hb(scanline);
for(x=1,max=0,maxref=0;x<7;x++)
{
if(deempcnt[x]>max)
{
max=deempcnt[x];
maxref=x;
}
deempcnt[x]=0;
}
//FCEU_DispMessage("%2x:%2x:%2x:%2x:%2x:%2x:%2x:%2x %d",deempcnt[0],deempcnt[1],deempcnt[2],deempcnt[3],deempcnt[4],deempcnt[5],deempcnt[6],deempcnt[7],maxref);
//memset(deempcnt,0,sizeof(deempcnt));
SetNESDeemph(maxref,0);
}
} //else... to if(ppudead)
#ifdef FRAMESKIP
if(skip)
{
FCEU_PutImageDummy();
return(0);
}
else
#endif
{
//mbg 6/21/08 - tileview is being ripped out since i dont know how long its been since it worked
//if(tileview) TileView();
FCEU_PutImage();
return(1);
}
}
int (*PPU_MASTER)(int skip) = FCEUPPU_Loop;
static uint16 TempAddrT,RefreshAddrT;
void FCEUPPU_LoadState(int version)
{
TempAddr=TempAddrT;
RefreshAddr=RefreshAddrT;
}
SFORMAT FCEUPPU_STATEINFO[]={
{ NTARAM, 0x800, "NTAR"},
{ PALRAM, 0x20, "PRAM"},
{ SPRAM, 0x100, "SPRA"},
{ PPU, 0x4, "PPUR"},
{ &kook, 1, "KOOK"},
{ &ppudead, 1, "DEAD"},
{ &PPUSPL, 1, "PSPL"},
{ &XOffset, 1, "XOFF"},
{ &vtoggle, 1, "VTOG"},
{ &RefreshAddrT, 2|FCEUSTATE_RLSB, "RADD"},
{ &TempAddrT, 2|FCEUSTATE_RLSB, "TADD"},
{ &VRAMBuffer, 1, "VBUF"},
{ &PPUGenLatch, 1, "PGEN"},
{ 0 }
};
void FCEUPPU_SaveState(void)
{
TempAddrT=TempAddr;
RefreshAddrT=RefreshAddr;
}
//---------------------
int pputime=0;
int totpputime=0;
const int kLineTime=341;
const int kFetchTime=2;
int idleSynch = 1;
void runppu(int x) {
//pputime+=x;
//if(cputodo<200) return;
ppur.status.cycle = (ppur.status.cycle + x) %
ppur.status.end_cycle;
if (cpu_ignore)
{
if (cpu_ignore <= x)
{
cpu_ignore = 0;
X6502_Run(x-cpu_ignore);
}
else
cpu_ignore -= x;
}
else
X6502_Run(x);
//pputime -= cputodo<<2;
}
//todo - consider making this a 3 or 4 slot fifo to keep from touching so much memory
struct BGData {
struct Record {
uint8 nt, at, pt[2];
void Read() {
RefreshAddr = ppur.get_ntread();
nt = CALL_PPUREAD(RefreshAddr);
runppu(kFetchTime);
RefreshAddr = ppur.get_atread();
at = CALL_PPUREAD(RefreshAddr);
//modify at to get appropriate palette shift
if(ppur.vt&2) at >>= 4;
if(ppur.ht&2) at >>= 2;
at &= 0x03;
at <<= 2;
//horizontal scroll clocked at cycle 3 and then
//vertical scroll at 251
runppu(1);
if (PPUON)
{
ppur.increment_hsc();
if (ppur.status.cycle == 251)
ppur.increment_vs();
}
runppu(1);
ppur.par = nt;
RefreshAddr = ppur.get_ptread();
pt[0] = CALL_PPUREAD(RefreshAddr);
runppu(kFetchTime);
RefreshAddr |= 8;
pt[1] = CALL_PPUREAD(RefreshAddr);
runppu(kFetchTime);
}
};
Record main[34]; //one at the end is junk, it can never be rendered
} bgdata;
int framectr=0;
int FCEUX_PPU_Loop(int skip) {
//262 scanlines
if (ppudead)
{
/* not quite emulating all the NES power up behavior
* since it is known that the NES ignores writes to some
* register before around a full frame, but no games
* should write to those regs during that time, it needs
* to wait for vblank */
ppur.status.sl = 241;
if (PAL)
runppu(70*kLineTime);
else
runppu(20*kLineTime);
ppur.status.sl = 0;
cpu_ignore = 0;
runppu(242*kLineTime);
ppudead = 0;
cpu_ignore = 0;
goto finish;
}
{
PPU_status |= 0x80;
ppuphase = PPUPHASE_VBL;
//Not sure if this is correct. According to Matt Conte and my own tests, it is.
//Timing is probably off, though.
//NOTE: Not having this here breaks a Super Donkey Kong game.
PPU[3]=PPUSPL=0;
const int delay = 20; //fceu used 12 here but I couldnt get it to work in marble madness and pirates.
ppur.status.sl = 241; //for sprite reads
runppu(delay); //X6502_Run(12);
if(VBlankON) TriggerNMI();
if (PAL)
runppu(70*(kLineTime)-delay);
else
runppu(20*(kLineTime)-delay);
cpu_ignore = 0; //no ignores because NMI runs full cycle
//this seems to run just before the dummy scanline begins
PPU_status = 0;
//this early out caused metroid to fail to boot. I am leaving it here as a reminder of what not to do
//if(!PPUON) { runppu(kLineTime*242); goto finish; }
//There are 2 conditions that update all 5 PPU scroll counters with the
//contents of the latches adjacent to them. The first is after a write to
//2006/2. The second, is at the beginning of scanline 20, when the PPU starts
//rendering data for the first time in a frame (this update won't happen if
//all rendering is disabled via 2001.3 and 2001.4).
//if(PPUON)
// ppur.install_latches();
uint8 oams[2][64][7];
int oamcounts[2]={0,0};
int oamslot=0;
int oamcount;
//capture the initial xscroll
//int xscroll = ppur.fh;
//render 241 scanlines (including 1 dummy at beginning)
for(int sl=0;sl<241;sl++) {
spr_read.num = 1;
spr_read.found = 0;
spr_read.fetch = 1;
spr_read.count = 0;
spr_read.last = 64;
spr_read.mode = 0;
memset(spr_read.found_pos, 0, sizeof(spr_read.found_pos));
ppur.status.sl = sl;
int yp = sl-1;
ppuphase = PPUPHASE_BG;
if(sl != 0) {
DEBUG(FCEUD_UpdatePPUView(scanline=yp,1));
DEBUG(FCEUD_UpdateNTView(scanline=yp,1));
}
if(sl != 0) if(MMC5Hack && PPUON) MMC5_hb(yp);
//twiddle the oam buffers
int scanslot = oamslot^1;
int renderslot = oamslot;
oamslot ^= 1;
oamcount = oamcounts[renderslot];
//the main scanline rendering loop:
//32 times, we will fetch a tile and then render 8 pixels.
//two of those tiles were read in the last scanline.
for(int xt=0;xt<32;xt++) {
bgdata.main[xt+2].Read();
//ok, we're also going to draw here.
//unless we're on the first dummy scanline
if(sl != 0) {
int xstart = xt<<3;
oamcount = oamcounts[renderslot];
uint8 *target=XBuf+(yp<<8)+xstart;
uint8 *ptr = target;
int rasterpos = xstart;
//check all the conditions that can cause things to render in these 8px
bool renderspritenow = SpriteON && rendersprites && (xt>0 || SpriteLeft8);
bool renderbgnow = ScreenON && renderbg && (xt>0 || BGLeft8);
for(int xp=0;xp<8;xp++,rasterpos++) {
//bg pos is different from raster pos due to its offsetability.
//so adjust for that here
int bgpos = rasterpos + ppur.fh;
int bgpx = bgpos&7;
int bgtile = bgpos>>3;
uint8 pixel=0, pixelcolor;
//generate the BG data
if(renderbgnow)
{
uint8* pt = bgdata.main[bgtile].pt;
pixel = ((pt[0]>>(7-bgpx))&1) | (((pt[1]>>(7-bgpx))&1)<<1) | bgdata.main[bgtile].at;
}
pixelcolor = PALRAM[pixel];
//look for a sprite to be drawn
bool havepixel = false;
for(int s=0;s<oamcount;s++) {
uint8* oam = oams[renderslot][s];
int x = oam[3];
if(rasterpos>=x && rasterpos<x+8) {
//build the pixel.
//fetch the LSB of the patterns
uint8 spixel = oam[4]&1;
spixel |= (oam[5]&1)<<1;
//shift down the patterns so the next pixel is in the LSB
oam[4] >>= 1;
oam[5] >>= 1;
if(!renderspritenow) continue;
//bail out if we already have a pixel from a higher priority sprite
if(havepixel) continue;
//transparent pixel bailout
if(spixel==0) continue;
//spritehit:
//1. is it sprite#0?
//2. is the bg pixel nonzero?
//then, it is spritehit.
if(oam[6] == 0 && pixel != 0)
PPU_status |= 0x40;
havepixel = true;
//priority handling
if(oam[2]&0x20) {
//behind background:
if((pixel&3)!=0) continue;
}
//bring in the palette bits and palettize
spixel |= (oam[2]&3)<<2;
pixelcolor = PALRAM[0x10+spixel];
}
}
//fceu rendering system requires that this be set
//(so that it knows there is a valid pixel there?)
pixelcolor |= 0x80;
*ptr++ = pixelcolor;
}
}
}
//look for sprites (was supposed to run concurrent with bg rendering)
oamcounts[scanslot] = 0;
oamcount=0;
int spriteHeight = Sprite16?16:8;
for(int i=0;i<64;i++) {
uint8* spr = SPRAM+i*4;
if(yp >= spr[0] && yp < spr[0]+spriteHeight) {
//if we already have maxsprites, then this new one causes an overflow,
//set the flag and bail out.
if(oamcount == maxsprites) {
PPU_status |= 0x20;
break;
}
//just copy some bytes into the internal sprite buffer
for(int j=0;j<4;j++)
oams[scanslot][oamcount][j] = spr[j];
//note that we stuff the oam index into [6].
//i need to turn this into a struct so we can have fewer magic numbers
oams[scanslot][oamcount][6] = (uint8)i;
oamcount++;
}
}
oamcounts[scanslot] = oamcount;
//FV is clocked by the PPU's horizontal blanking impulse, and therefore will increment every scanline.
//well, according to (which?) tests, maybe at the end of hblank.
//but, according to what it took to get crystalis working, it is at the beginning of hblank.
//this is done at cycle 251
//rendering scanline, it doesn't need to be scanline 0,
//because on the first scanline when the increment is 0, the vs_scroll is reloaded.
//if(PPUON && sl != 0)
// ppur.increment_vs();
//todo - think about clearing oams to a predefined value to force deterministic behavior
//so.. this is the end of hblank. latch horizontal scroll values
//do it cycle at 251
if(PPUON && sl != 0)
ppur.install_h_latches();
ppuphase = PPUPHASE_OBJ;
//fetch sprite patterns
for(int s=0;s<maxsprites;s++) {
//if we have hit our eight sprite pattern and we dont have any more sprites, then bail
if(s==oamcount && s>=8)
break;
//if this is a real sprite sprite, then it is not above the 8 sprite limit.
//this is how we support the no 8 sprite limit feature.
//not that at some point we may need a virtual CALL_PPUREAD which just peeks and doesnt increment any counters
//this could be handy for the debugging tools also
bool realSprite = (s<8);
uint8* oam = oams[scanslot][s];
uint32 line = yp - oam[0];
if(oam[2]&0x80) //vflip
line = spriteHeight-line-1;
uint32 patternNumber = oam[1];
uint32 patternAddress;
//8x16 sprite handling:
if(Sprite16) {
uint32 bank = (patternNumber&1)<<12;
patternNumber = patternNumber&~1;
patternNumber |= (line>>3);
patternAddress = (patternNumber<<4) | bank;
} else {
patternAddress = (patternNumber<<4) | (SpAdrHI<<9);
}
//offset into the pattern for the current line.
//tricky: tall sprites have already had lines>8 taken care of by getting a new pattern number above.
//so we just need the line offset for the second pattern
patternAddress += line&7;
//garbage nametable fetches
//reset the scroll counter, happens at cycle 304
if (realSprite)
{
if ((sl == 0) && PPUON)
{
if (ppur.status.cycle == 304)
{
runppu(1);
ppur.install_latches();
runppu(1);
}
else
runppu(kFetchTime);
}
else
runppu(kFetchTime);
}
if(((PPU[0]&0x38)!=0x18) && s == 2 && SpriteON ) {
//(The MMC3 scanline counter is based entirely on PPU A12, triggered on rising edges (after the line remains low for a sufficiently long period of time))
//http://nesdevwiki.org/wiki/index.php/Nintendo_MMC3
//test cases for timing: SMB3, Crystalis
//crystalis requires deferring this til somewhere in sprite [1,3]
//kirby requires deferring this til somewhere in sprite [2,5..
if(PPUON && GameHBIRQHook) {
GameHBIRQHook();
}
}
if(realSprite) runppu(kFetchTime);
//pattern table fetches
RefreshAddr = patternAddress;
oam[4] = CALL_PPUREAD(RefreshAddr);
if(realSprite) runppu(kFetchTime);
RefreshAddr += 8;
oam[5] = CALL_PPUREAD(RefreshAddr);
if(realSprite) runppu(kFetchTime);
//hflip
if(!(oam[2]&0x40)) {
oam[4] = bitrevlut[oam[4]];
oam[5] = bitrevlut[oam[5]];
}
}
ppuphase = PPUPHASE_BG;
//fetch BG: two tiles for next line
for(int xt=0;xt<2;xt++)
bgdata.main[xt].Read();
//I'm unclear of the reason why this particular access to memory is made.
//The nametable address that is accessed 2 times in a row here, is also the
//same nametable address that points to the 3rd tile to be rendered on the
//screen (or basically, the first nametable address that will be accessed when
//the PPU is fetching background data on the next scanline).
//(not implemented yet)
runppu(kFetchTime);
if (sl == 0)
{
if (idleSynch && PPUON && !PAL)
ppur.status.end_cycle = 340;
else
ppur.status.end_cycle = 341;
idleSynch ^= 1;
}
else
ppur.status.end_cycle = 341;
runppu(kFetchTime);
//After memory access 170, the PPU simply rests for 4 cycles (or the
//equivelant of half a memory access cycle) before repeating the whole
//pixel/scanline rendering process. If the scanline being rendered is the very
//first one on every second frame, then this delay simply doesn't exist.
if (ppur.status.end_cycle == 341)
runppu(1);
}
if(MMC5Hack && PPUON) MMC5_hb(240);
//idle for one line
runppu(kLineTime);
cpu_ignore = 0;
framectr++;
}
finish:
FCEU_PutImage();
return 0;
}
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