sys/src/games/snes/state.c

   1 #include <u.h>
   2 #include <libc.h>
   3 #include <thread.h>
   4 #include <draw.h>
   5 #include <bio.h>
   6 #include "dat.h"
   7 #include "fns.h"
   8
   9 static Biobuf *bp;
  10
  11 void
  12 put8(u8int i)
  13 {
  14         Bputc(bp, i);
  15 }
  16
  17 void
  18 put16(u16int i)
  19 {
  20         put8(i);
  21         put8(i >> 8);
  22 }
  23
  24 void
  25 put32(u32int i)
  26 {
  27         put8(i);
  28         put8(i >> 8);
  29         put8(i >> 16);
  30         put8(i >> 24);
  31 }
  32
  33 void
  34 put16s(u16int *p, int n)
  35 {
  36         while(n--)
  37                 put16(*p++);
  38 }
  39
  40 int
  41 get8(void)
  42 {
  43         return Bgetc(bp);
  44 }
  45
  46 int
  47 get16(void)
  48 {
  49         int i;
  50
  51         i = get8();
  52         i |= get8() << 8;
  53         return i;
  54 }
  55
  56 int
  57 get32(void)
  58 {
  59         int i;
  60
  61         i = get8();
  62         i |= get8() << 8;
  63         i |= get8() << 16;
  64         i |= get8() << 24;
  65         return i;
  66 }
  67
  68 void
  69 get16s(u16int *p, int n)
  70 {
  71         while(n--)
  72                 *p++ = get16();
  73 }
  74
  75 void
  76 loadstate(char *file)
  77 {
  78         bp = Bopen(file, OREAD);
  79         if(bp == nil){
  80                 message("open: %r");
  81                 return;
  82         }
  83         Bread(bp, reg, sizeof(reg));
  84         Bread(bp, mem, sizeof(mem));
  85         Bread(bp, vram, sizeof(vram));
  86         Bread(bp, oam, sizeof(oam));
  87         Bread(bp, spcmem, sizeof(spcmem));
  88         Bread(bp, dsp, sizeof(dsp));
  89         get16s(cgram, nelem(cgram));
  90         ppuclock = get32();
  91         spcclock = get32();
  92         dspclock = get32();
  93         stimerclock = get32();
  94         rA = get16();
  95         rX = get16();
  96         rY = get16();
  97         rS = get16();
  98         rP = get8();
  99         rD = get16();
 100         rDB = get8()<<16;
 101         pc = get16();
 102         rPB = get8()<<16;
 103         emu = get8();
 104         irq = get8();
 105         nmi = get8();
 106         dma = get8();
 107         hdma = get32();
 108         wai = get8();
 109         mdr = get8();
 110         mdr1 = get8();
 111         mdr2 = get8();
 112         oamaddr = get16();
 113         vramlatch = get16();
 114         keylatch = get32();
 115         ppux = get16();
 116         ppuy = get16();
 117         htime = reg[0x4207] | reg[0x4208] << 8 & 0x100;
 118         vtime = reg[0x4209] | reg[0x420a] << 8 & 0x100;
 119         subcolor = get16();
 120         get16s(hofs, nelem(hofs));
 121         get16s(vofs, nelem(vofs));
 122         get16s((u16int*) m7, nelem(m7));
 123         sA = get8();
 124         sX = get8();
 125         sY = get8();
 126         sS = get8();
 127         sP = get8();
 128         dspstate = get8();
 129         dspcounter = get16();
 130         noise = get16();
 131         Bterm(bp);
 132 }
 133
 134 void
 135 savestate(char *file)
 136 {
 137         flushram();
 138         bp = Bopen(file, OWRITE);
 139         if(bp == nil){
 140                 message("open: %r");
 141                 return;
 142         }
 143         Bwrite(bp, reg, sizeof(reg));
 144         Bwrite(bp, mem, sizeof(mem));
 145         Bwrite(bp, vram, sizeof(vram));
 146         Bwrite(bp, oam, sizeof(oam));
 147         Bwrite(bp, spcmem, sizeof(spcmem));
 148         Bwrite(bp, dsp, sizeof(dsp));
 149         put16s(cgram, nelem(cgram));
 150         put32(ppuclock);
 151         put32(spcclock);
 152         put32(dspclock);
 153         put32(stimerclock);
 154         put16(rA);
 155         put16(rX);
 156         put16(rY);
 157         put16(rS);
 158         put8(rP);
 159         put16(rD);
 160         put8(rDB>>16);
 161         put16(pc);
 162         put8(rPB>>16);
 163         put8(emu);
 164         put8(irq);
 165         put8(nmi);
 166         put8(dma);
 167         put32(hdma);
 168         put8(wai);
 169         put8(mdr);
 170         put8(mdr1);
 171         put8(mdr2);
 172         put16(oamaddr);
 173         put16(vramlatch);
 174         put32(keylatch);
 175         put16(ppux);
 176         put16(ppuy);
 177         put16(subcolor);
 178         put16s(hofs, nelem(hofs));
 179         put16s(vofs, nelem(vofs));
 180         put16s((u16int*) m7, nelem(m7));
 181         put8(sA);
 182         put8(sX);
 183         put8(sY);
 184         put8(sS);
 185         put8(sP);
 186         put8(dspstate);
 187         put16(dspcounter);
 188         put16(noise);
 189         Bterm(bp);
 190 }