sys/src/games/nes/state.c

   1 #include <u.h>
   2 #include <libc.h>
   3 #include <thread.h>
   4 #include <draw.h>
   5 #include "dat.h"
   6 #include "fns.h"
   7
   8 static int fd;
   9
  10 void
  11 put8(u8int i)
  12 {
  13         write(fd, &i, 1);
  14 }
  15
  16 void
  17 put16(u16int i)
  18 {
  19         put8(i);
  20         put8(i >> 8);
  21 }
  22
  23 void
  24 put32(u32int i)
  25 {
  26         put8(i);
  27         put8(i >> 8);
  28         put8(i >> 16);
  29         put8(i >> 24);
  30 }
  31
  32 int
  33 get8(void)
  34 {
  35         u8int c;
  36
  37         read(fd, &c, 1);
  38         return c;
  39 }
  40
  41 int
  42 get16(void)
  43 {
  44         int i;
  45
  46         i = get8();
  47         i |= get8() << 8;
  48         return i;
  49 }
  50
  51 int
  52 get32(void)
  53 {
  54         int i;
  55
  56         i = get8();
  57         i |= get8() << 8;
  58         i |= get8() << 16;
  59         i |= get8() << 24;
  60         return i;
  61 }
  62
  63 void
  64 loadstate(char *file)
  65 {
  66         fd = open(file, OREAD);
  67         if(fd < 0){
  68                 message("open: %r");
  69                 return;
  70         }
  71         read(fd, mem, sizeof(mem));
  72         read(fd, ppuram, sizeof(ppuram));
  73         read(fd, oam, sizeof(oam));
  74         if(chrram)
  75                 read(fd, chr, nchr * CHRSZ);
  76         rA = get8();
  77         rX = get8();
  78         rY = get8();
  79         rS = get8();
  80         rP = get8();
  81         nmi = get8();
  82         pc = get16();
  83         pput = get16();
  84         ppuv = get16();
  85         ppusx = get8();
  86         ppux = get16();
  87         ppuy = get16();
  88         mirr = get8();
  89         odd = get8();
  90         vramlatch = get8();
  91         keylatch = get8();
  92         vrambuf = get8();
  93         clock = get32();
  94         ppuclock = get32();
  95         apuclock = get32();
  96         apuseq = get8();
  97         dmcaddr = get16();
  98         dmccnt = get16();
  99         read(fd, apuctr, sizeof(apuctr));
 100         mapper[map](RSTR, 0);
 101         close(fd);
 102 }
 103
 104 void
 105 savestate(char *file)
 106 {
 107         fd = create(file, ORDWR, 0666);
 108         if(fd < 0){
 109                 message("create: %r");
 110                 return;
 111         }
 112         write(fd, mem, sizeof(mem));
 113         write(fd, ppuram, sizeof(ppuram));
 114         write(fd, oam, sizeof(oam));
 115         if(chrram)
 116                 write(fd, chr, nchr * CHRSZ);
 117         put8(rA);
 118         put8(rX);
 119         put8(rY);
 120         put8(rS);
 121         put8(rP);
 122         put8(nmi);
 123         put16(pc);
 124         put16(pput);
 125         put16(ppuv);
 126         put8(ppusx);
 127         put16(ppux);
 128         put16(ppuy);
 129         put8(mirr);
 130         put8(odd);
 131         put8(vramlatch);
 132         put8(keylatch);
 133         put8(vrambuf);
 134         put32(clock);
 135         put32(ppuclock);
 136         put32(apuclock);
 137         put8(apuseq);
 138         put16(dmcaddr);
 139         put16(dmccnt);
 140         write(fd, apuctr, sizeof(apuctr));
 141         mapper[map](SAVE, 0);
 142         close(fd);
 143 }