ref: d457a43461852636db313c4854590b2c62a21e23
dir: /sys/src/games/gba/gba.c/
#include <u.h>
#include <libc.h>
#include <thread.h>
#include <draw.h>
#include <mouse.h>
#include <keyboard.h>
#include "dat.h"
#include "fns.h"
int cpuhalt;
int scale, profile;
Rectangle picr;
Image *bg, *tmp;
Mousectl *mc;
int keys, paused, framestep, backup;
QLock pauselock;
int savefd, saveframes;
int clock;
int savereq, loadreq;
char *biosfile = "/sys/games/lib/gbabios.bin";
void *
emalloc(ulong sz)
{
void *v;
v = malloc(sz);
if(v == nil)
sysfatal("malloc: %r");
setmalloctag(v, getcallerpc(&sz));
return v;
}
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;
return FLASH;
}
if(memcmp(p - 1, "FLASH1M_V", 9) == 0){
*size = 128*KB;
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;
return FLASH;
}else if(strcmp(s, "flash1024") == 0){
*size = 128*KB;
return FLASH;
}else
return NOBACK;
}
void
typename(char *s, int type, int size)
{
char *st;
switch(type){
case EEPROM:
st = "eeprom";
break;
case FLASH:
st = "flash";
break;
case SRAM:
st = "sram";
break;
default:
sysfatal("typestr: unknown type %d -- shouldn't happen", type);
return;
}
snprint(s, BACKTYPELEN, "%s%d", st, size/128);
}
void
loadsave(char *file)
{
char *buf, *p;
char tstr[BACKTYPELEN];
int type, size;
buf = emalloc(strlen(file) + 4);
strcpy(buf, file);
p = strchr(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
screeninit(void)
{
Point p;
p = divpt(addpt(screen->r.min, screen->r.max), 2);
picr = (Rectangle){subpt(p, Pt(scale * 120, scale * 80)), addpt(p, Pt(scale * 120, scale * 80))};
tmp = allocimage(display, Rect(0, 0, scale * 240, scale > 1 ? 1 : scale * 160), CHAN4(CIgnore, 1, CBlue, 5, CGreen, 5, CRed, 5), scale > 1, 0);
bg = allocimage(display, Rect(0, 0, 1, 1), screen->chan, 1, 0xCCCCCCFF);
draw(screen, screen->r, bg, nil, ZP);
}
void
keyproc(void *)
{
int fd, k;
static char buf[256];
char *s;
Rune r;
fd = open("/dev/kbd", OREAD);
if(fd < 0)
sysfatal("open: %r");
for(;;){
if(read(fd, buf, sizeof(buf) - 1) <= 0)
sysfatal("read /dev/kbd: %r");
if(buf[0] == 'c'){
if(utfrune(buf, KF|5))
savereq = 1;
if(utfrune(buf, KF|6))
loadreq = 1;
if(utfrune(buf, Kdel)){
close(fd);
threadexitsall(nil);
}
if(utfrune(buf, 't'))
trace = !trace;
}
if(buf[0] != 'k' && buf[0] != 'K')
continue;
s = buf + 1;
k = 0;
while(*s != 0){
s += chartorune(&r, s);
switch(r){
case Kdel: close(fd); threadexitsall(nil);
case 'z': k |= 1<<1; break;
case 'x': k |= 1<<0; break;
case 'a': k |= 1<<9; break;
case 's': k |= 1<<8; break;
case Kshift: k |= 1<<2; break;
case 10: k |= 1<<3; break;
case Kup: k |= 1<<6; break;
case Kdown: k |= 1<<7; break;
case Kleft: k |= 1<<5; break;
case Kright: k |= 1<<4; break;
case Kesc:
if(paused)
qunlock(&pauselock);
else
qlock(&pauselock);
paused = !paused;
break;
case KF|1:
if(paused){
qunlock(&pauselock);
paused=0;
}
framestep = !framestep;
break;
}
}
k &= ~(k << 1 & 0xa0 | k >> 1 & 0x50);
keys = k;
}
}
void
timing(void)
{
static int fcount;
static vlong old;
static char buf[32];
vlong new;
if(++fcount == 60)
fcount = 0;
else
return;
new = nsec();
if(new != old)
sprint(buf, "%6.2f%%", 1e11 / (new - old));
else
buf[0] = 0;
draw(screen, rectaddpt(Rect(10, 10, 200, 30), screen->r.min), bg, nil, ZP);
string(screen, addpt(screen->r.min, Pt(10, 10)), display->black, ZP, display->defaultfont, buf);
old = nsec();
}
void
flush(void)
{
extern uchar pic[];
Mouse m;
int x;
static vlong old, delta;
vlong new, diff;
if(nbrecvul(mc->resizec) > 0){
if(getwindow(display, Refnone) < 0)
sysfatal("resize failed: %r");
screeninit();
}
while(nbrecv(mc->c, &m) > 0)
;
if(scale == 1){
loadimage(tmp, tmp->r, pic, 240*160*2);
draw(screen, picr, tmp, nil, ZP);
} else {
Rectangle r;
uchar *s;
int w;
s = pic;
r = picr;
w = 240*2*scale;
while(r.min.y < picr.max.y){
loadimage(tmp, tmp->r, s, w);
s += w;
r.max.y = r.min.y+scale;
draw(screen, r, tmp, nil, ZP);
r.min.y = r.max.y;
}
}
flushimage(display, 1);
if(profile)
timing();
if(audioout() < 0){
new = nsec();
diff = 0;
if(old != 0){
diff = BILLION/60 - (new - old) - delta;
if(diff >= MILLION)
sleep(diff/MILLION);
}
old = nsec();
if(diff != 0){
diff = (old - new) - (diff / MILLION) * MILLION;
delta += (diff - delta) / 100;
}
}
if(framestep){
paused = 1;
qlock(&pauselock);
framestep = 0;
}
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 [-23aT] [-s savetype] [-b biosfile] rom\n", argv0);
exits("usage");
}
void
threadmain(int argc, char **argv)
{
char *s;
int t;
scale = 1;
ARGBEGIN {
case '2':
scale = 2;
break;
case '3':
scale = 3;
break;
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 'T':
profile++;
break;
default:
usage();
} ARGEND;
if(argc < 1)
usage();
loadbios();
loadrom(argv[0]);
if(initdraw(nil, nil, nil) < 0)
sysfatal("initdraw: %r");
mc = initmouse(nil, screen);
if(mc == nil)
sysfatal("initmouse: %r");
proccreate(keyproc, nil, mainstacksize);
screeninit();
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();
}
}