diff options
Diffstat (limited to 'sys/src/games/snes/mem.c')
| -rw-r--r-- | sys/src/games/snes/mem.c | 48 |
1 files changed, 42 insertions, 6 deletions
diff --git a/sys/src/games/snes/mem.c b/sys/src/games/snes/mem.c index dcf136e3d..3cb44ee35 100644 --- a/sys/src/games/snes/mem.c +++ b/sys/src/games/snes/mem.c @@ -8,7 +8,8 @@ u8int reg[32768]; u8int mem[131072]; u8int oam[544], vram[65536]; u16int cgram[256]; -u16int oamaddr, vramlatch, keylatch; +u16int oamaddr, vramlatch; +u32int keylatch, lastkeys; enum { OAMLATCH, CGLATCH, @@ -62,6 +63,31 @@ swaprb(u16int a) return (a & 0x83e0) | (a & 0x7c00) >> 10 | (a & 0x001f) << 10; } +static void +mouselatch(void) +{ + int x, y; + u32int v; + + v = keys & 0xffff0000; + x = (keys & 0xff) - (lastkeys & 0xff); + y = (keys >> 8 & 0xff) - (lastkeys >> 8 & 0xff); + if(x < 0){ + v |= 0x80; + x = -x; + } + if(y < 0){ + v |= 0x8000; + y = -y; + } + if(x > 127) + x = 127; + if(y > 127) + y = 127; + keylatch = v | x | y << 8; + lastkeys = keys; +} + u8int regread(u16int p) { @@ -124,9 +150,15 @@ regread(u16int p) reg[0x2181]++; return v; case 0x4016: - if((reg[0x4016] & 1) != 0) - return keylatch >> 15; - v = keylatch >> 15; + if((reg[0x4016] & 1) != 0){ + if(mouse) + if((keys & 0x300000) == 0x300000) + keys &= ~0x300000; + else + keys += 0x100000; + return keys >> 31; + } + v = keylatch >> 31; keylatch = (keylatch << 1) | 1; return v; case 0x4017: @@ -235,8 +267,12 @@ regwrite(u16int p, u8int v) case 0x213e: return; case 0x4016: - if((reg[0x4016] & 1) != 0 && (v & 1) == 0) - keylatch = keys; + if((reg[0x4016] & 1) != 0 && (v & 1) == 0){ + if(mouse) + mouselatch(); + else + keylatch = keys; + } break; case 0x4200: if((reg[0x4200] & 0x80) == 0 && (v & 0x80) != 0 && (reg[RDNMI] & 0x80) != 0) |