ref: fe5d1976a0b4376c955ca8423eb9005f5d035403
dir: /sys/src/games/2600/2600.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" u8int *rom, *rop; u16int bnk[8]; int mask = 0xfff; void togdifc(void) { p0difc ^= 1<<6; } void togbw(void) { bwmod ^= 1<<3; } static void loadrom(char *name) { int i, sz, fd; fd = open(name, OREAD); if(fd < 0) sysfatal("open: %r"); sz = seek(fd, 0, 2); switch(sz){ case 0x800: mask = 0x7ff; case 0x1000: break; case 0x3000: bnk[6] = 2<<12; case 0x2000: bnk[5] = 1<<12; break; case 0x4000: for(i=1; i<4; bnk[i+2] = i<<12, i++); break; case 0x8000: for(i=1; i<8; bnk[i] = i<<12, i++); break; default: sysfatal("unsupported ROM size"); } rom = malloc(sz); if(rom == nil) sysfatal("malloc: %r"); rop = rom; pread(fd, rom, sz, 0); close(fd); } void usage(void) { fprint(2, "usage: %s [-a] [-x scale] rom\n", argv0); exits("usage"); } void threadmain(int argc, char **argv) { ARGBEGIN { case 'a': initaudio(); break; case 'x': fixscale = strtol(EARGF(usage()), nil, 0); break; default: usage(); } ARGEND; if(argc != 1) usage(); loadrom(argv[0]); initemu(PICW, PICH, 4, XRGB32, 1, nil); regkey("a", ' ', 1<<4); regkey("start", 'q', 1<<5); regkey("control", 'w', 1<<6); regkey("up", Kup, 1<<0); regkey("down", Kdown, 1<<1); regkey("left", Kleft, 1<<2); regkey("right", Kright, 1<<3); regkeyfn('e', togdifc); regkeyfn('r', togbw); pc = memread(0xFFFC) | memread(0xFFFD) << 8; rP = FLAGI; for(;;){ if(paused){ qlock(&pauselock); qunlock(&pauselock); } step(); } } void flush(void) { flushmouse(1); flushscreen(); flushaudio(audioout); }