ref: af848f17658455d643de41f9cb53b61fe2eb72a6
dir: /sys/src/games/gba/gba.c/
#include <u.h>
#include <libc.h>
#include <thread.h>
#include <draw.h>
#include <keyboard.h>
#include "../eui.h"
#include "dat.h"
#include "fns.h"
int cpuhalt;
Image *tmp;
int backup;
int savefd, saveframes;
int clock;
char *biosfile = "/sys/games/lib/gbabios.bin";
enum {
IDSST = 0xd4bf,
IDMacronix64 = 0x1cc2,
IDPanasonic = 0x1b32,
IDAtmel = 0x3d1f,
IDSanyo = 0x1362,
IDMacronix128 = 0x09c2,
};
void
writeback(void)
{
if(saveframes == 0)
saveframes = 15;
}
void
flushback(void)
{
if(savefd >= 0)
pwrite(savefd, back, nback, BACKTYPELEN);
saveframes = 0;
}
void
loadbios(void)
{
extern uchar bios[16384];
int fd;
fd = open(biosfile, OREAD);
if(fd < 0)
sysfatal("open: %r");
readn(fd, bios, 16384);
close(fd);
}
int
romtype(int *size)
{
u32int *p, n, v;
union {char a[4]; u32int u;} s1 = {"EEPR"}, s2 = {"SRAM"}, s3 = {"FLAS"};
p = (u32int *) rom;
n = nrom / 4;
do{
v = *p++;
if(v == s1.u && memcmp(p - 1, "EEPROM_V", 8) == 0){
print("backup type is either eeprom4 or eeprom64 -- can't detect which one\n");
return NOBACK;
}
if(v == s2.u && memcmp(p - 1, "SRAM_V", 6) == 0){
*size = 32*KB;
return SRAM;
}
if(v == s3.u){
if(memcmp(p - 1, "FLASH_V", 7) == 0 || memcmp(p - 1, "FLASH512_V", 10) == 0){
*size = 64*KB;
flashid = IDSST;
return FLASH;
}
if(memcmp(p - 1, "FLASH1M_V", 9) == 0){
*size = 128*KB;
flashid = IDMacronix128;
return FLASH;
}
}
}while(--n);
return NOBACK;
}
int
parsetype(char *s, int *size)
{
if(strcmp(s, "eeprom4") == 0){
*size = 512;
return EEPROM;
}else if(strcmp(s, "eeprom64") == 0){
*size = 8*KB;
return EEPROM;
}else if(strcmp(s, "sram256") == 0){
*size = 32*KB;
return SRAM;
}else if(strcmp(s, "flash512") == 0){
*size = 64*KB;
flashid = IDSST;
return FLASH;
}else if(strcmp(s, "flash512mx") == 0){
*size = 64*KB;
flashid = IDMacronix64;
return FLASH;
}else if(strcmp(s, "flash512pan") == 0){
*size = 64*KB;
flashid = IDPanasonic;
return FLASH;
}else if(strcmp(s, "flash512atm") == 0){
*size = 64*KB;
flashid = IDAtmel;
return FLASH;
}else if(strcmp(s, "flash1024") == 0){
*size = 128*KB;
flashid = IDMacronix128;
return FLASH;
}else if(strcmp(s, "flash1024san") == 0){
*size = 128*KB;
flashid = IDSanyo;
return FLASH;
}else
return NOBACK;
}
void
typename(char *s, int type, int size)
{
char *st, *id;
id = "";
switch(type){
case EEPROM:
st = "eeprom";
break;
case FLASH:
st = "flash";
switch(flashid){
case IDMacronix64: id = "mx"; break;
case IDPanasonic: id = "pan"; break;
case IDAtmel: id = "atm"; break;
case IDSanyo: id = "san"; break;
}
break;
case SRAM:
st = "sram";
break;
default:
sysfatal("typestr: unknown type %d -- shouldn't happen", type);
return;
}
snprint(s, BACKTYPELEN, "%s%d%s", st, size/128, id);
}
void
loadsave(char *file)
{
char *buf, *p;
char tstr[BACKTYPELEN];
int type, size;
buf = emalloc(strlen(file) + 4);
strcpy(buf, file);
p = strrchr(buf, '.');
if(p == nil)
p = buf + strlen(buf);
strcpy(p, ".sav");
savefd = open(buf, ORDWR);
if(savefd < 0){
if(backup == NOBACK){
backup = romtype(&nback);
if(backup == NOBACK){
fprint(2, "failed to autodetect save format\n");
free(buf);
return;
}
}
savefd = create(buf, OWRITE, 0664);
if(savefd < 0){
fprint(2, "create: %r");
free(buf);
return;
}
memset(tstr, 0, sizeof(tstr));
typename(tstr, backup, nback);
write(savefd, tstr, sizeof(tstr));
back = emalloc(nback);
memset(back, 0, nback);
write(savefd, back, nback);
free(buf);
atexit(flushback);
return;
}
readn(savefd, tstr, sizeof(tstr));
tstr[31] = 0;
type = parsetype(tstr, &size);
if(type == NOBACK || backup != NOBACK && (type != backup || nback != size))
sysfatal("%s: invalid format", buf);
backup = type;
nback = size;
back = emalloc(nback);
readn(savefd, back, nback);
atexit(flushback);
free(buf);
}
void
loadrom(char *file)
{
int fd;
vlong sz;
fd = open(file, OREAD);
if(fd < 0)
sysfatal("open: %r");
sz = seek(fd, 0, 2);
if(sz <= 0 || sz > 32*1024*1024)
sysfatal("invalid file size");
seek(fd, 0, 0);
nrom = sz;
rom = emalloc(nrom);
if(readn(fd, rom, sz) < sz)
sysfatal("read: %r");
close(fd);
loadsave(file);
if(nrom == 32*KB*KB && backup == EEPROM)
nrom -= 256;
}
void
flush(void)
{
int x;
flushmouse(1);
flushscreen();
flushaudio(audioout);
if(saveframes > 0 && --saveframes == 0)
flushback();
if((reg[KEYCNT] & 1<<14) != 0){
x = reg[KEYCNT] & keys;
if((reg[KEYCNT] & 1<<15) != 0){
if(x == (reg[KEYCNT] & 0x3ff))
setif(IRQKEY);
}else
if(x != 0)
setif(IRQKEY);
}
}
void
usage(void)
{
fprint(2, "usage: %s [-a] [-s savetype] [-b biosfile] [-x scale] rom\n", argv0);
exits("usage");
}
void
threadmain(int argc, char **argv)
{
char *s;
int t;
ARGBEGIN {
case 'a':
audioinit();
break;
case 's':
s = EARGF(usage());
backup = parsetype(s, &nback);
if(backup == NOBACK)
sysfatal("unknown save type '%s'", s);
break;
case 'b':
biosfile = strdup(EARGF(usage()));
break;
case 'x':
fixscale = strtol(EARGF(usage()), nil, 0);
break;
default:
usage();
} ARGEND;
if(argc < 1)
usage();
loadbios();
loadrom(argv[0]);
initemu(240, 160, 2, CHAN4(CIgnore, 1, CBlue, 5, CGreen, 5, CRed, 5), 1, nil);
regkey("b", 'z', 1<<1);
regkey("a", 'x', 1<<0);
regkey("l1", 'a', 1<<9);
regkey("r1", 's', 1<<8);
regkey("control", Kshift, 1<<2);
regkey("start", '\n', 1<<3);
regkey("up", Kup, 1<<6);
regkey("down", Kdown, 1<<7);
regkey("left", Kleft, 1<<5);
regkey("right", Kright, 1<<4);
eventinit();
memreset();
reset();
for(;;){
if(savereq){
savestate("gba.save");
savereq = 0;
}
if(loadreq){
loadstate("gba.save");
loadreq = 0;
}
if(paused){
qlock(&pauselock);
qunlock(&pauselock);
}
if(dmaact)
t = dmastep();
else if(cpuhalt)
t = 8;
else
t = step();
clock += t;
if((elist->time -= t) <= 0)
popevent();
}
}