10 extern uchar ppuram[16384];
11 int nprg, nchr, map, chrram;
16 int clock, ppuclock, apuclock, dmcclock, dmcfreq, sampclock, msgclock, saveclock;
18 int keys, paused, savereq, loadreq, oflag, savefd = -1;
23 message(char *fmt, ...)
29 vsnprint(buf, sizeof buf, fmt, va);
30 string(screen, Pt(10, 10), display->black, ZP, display->defaultfont, buf);
39 pwrite(savefd, mem + 0x6000, 0x2000, 0);
44 loadrom(char *file, int sflag)
49 static uchar header[16];
53 fd = open(file, OREAD);
56 if(readn(fd, header, sizeof(header)) < sizeof(header))
58 if(memcmp(header, "NES\x1a", 4) != 0)
59 sysfatal("not a ROM");
61 memset(header + 7, 0, 9);
62 flags = header[6] | header[7] << 8;
63 nes20 = (flags & FLNES20M) == FLNES20V;
64 if(flags & (FLVS | FLPC10))
65 sysfatal("ROM not supported");
68 nprg |= (header[HROMH] & 0xf) << 8;
70 sysfatal("invalid ROM");
73 nchr |= (header[HROMH] & 0xf0) << 4;
74 map = (flags >> FLMAPPERL) & 0x0f | (((flags >> FLMAPPERH) & 0x0f) << 4);
76 map |= (header[8] & 0x0f) << 8;
77 if(map >= 256 || mapper[map] == nil)
78 sysfatal("unimplemented mapper %d", map);
80 memset(mem, 0, sizeof(mem));
81 if((flags & FLTRAINER) != 0 && readn(fd, mem + 0x7000, 512) < 512)
83 prg = malloc(nprg * PRGSZ);
85 sysfatal("malloc: %r");
86 if(readn(fd, prg, nprg * PRGSZ) < nprg * PRGSZ)
90 chr = malloc(nchr * CHRSZ);
92 sysfatal("malloc: %r");
93 if(readn(fd, chr, nchr * CHRSZ) < nchr * CHRSZ)
97 chr = malloc(nchr * CHRSZ);
99 sysfatal("malloc: %r");
101 if((flags & FLFOUR) != 0)
103 else if((flags & FLMIRROR) != 0)
108 strncpy(buf, file, sizeof buf - 5);
109 s = buf + strlen(buf) - 4;
110 if(s < buf || strcmp(s, ".nes") != 0)
113 savefd = create(buf, ORDWR | OEXCL, 0666);
115 savefd = open(buf, ORDWR);
119 readn(savefd, mem + 0x6000, 0x2000);
122 mapper[map](INIT, 0);
131 static char buf[256];
135 fd = open("/dev/kbd", OREAD);
137 sysfatal("open: %r");
139 if(read(fd, buf, sizeof(buf) - 1) <= 0)
140 sysfatal("read /dev/kbd: %r");
142 if(utfrune(buf, Kdel)){
146 if(utfrune(buf, KF|5))
148 if(utfrune(buf, KF|6))
150 if(utfrune(buf, 't'))
153 if(buf[0] != 'k' && buf[0] != 'K')
158 s += chartorune(&r, s);
160 case Kdel: close(fd); threadexitsall(nil);
161 case 'x': k |= 1<<0; break;
162 case 'z': k |= 1<<1; break;
163 case Kshift: k |= 1<<2; break;
164 case 10: k |= 1<<3; break;
165 case Kup: k |= 1<<4; break;
166 case Kdown: k |= 1<<5; break;
167 case Kleft: k |= 1<<6; break;
168 case Kright: k |= 1<<7; break;
183 threadmain(int argc, char **argv)
214 fprint(2, "usage: %s [-23aos] rom\n", argv0);
215 threadexitsall("usage");
217 loadrom(argv[0], sflag);
218 if(initdraw(nil, nil, nil) < 0)
219 sysfatal("initdraw: %r");
220 mc = initmouse(nil, screen);
222 sysfatal("initmouse: %r");
223 proccreate(keyproc, nil, 8192);
224 originwindow(screen, Pt(0, 0), screen->r.min);
225 p = divpt(addpt(screen->r.min, screen->r.max), 2);
226 picr = (Rectangle){subpt(p, Pt(scale * 128, scale * h/2)), addpt(p, Pt(scale * 128, scale * h/2))};
227 tmp = allocimage(display, Rect(0, 0, scale * 256, scale * h), XRGB32, 0, 0);
228 bg = allocimage(display, Rect(0, 0, 1, 1), screen->chan, 1, 0xCCCCCCFF);
229 draw(screen, screen->r, bg, nil, ZP);
231 pc = memread(0xFFFC) | memread(0xFFFD) << 8;
236 savestate("nes.save");
240 loadstate("nes.save");
253 while(ppuclock >= 4){
257 if(apuclock >= APUDIV){
261 if(sampclock >= SAMPDIV){
263 sampclock -= SAMPDIV;
265 if(dmcclock >= dmcfreq){
272 draw(screen, screen->r, bg, nil, ZP);