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#!/usr/bin/env python3
"""gbshot.py <sock> <out.bmp> — reconstruct the current GB screen from VRAM
(BG + window + sprites, both CGB banks) and save a 24-bit BMP. Grayscale from
the 2bpp tile values (enough to read menus/sprites). Uses the gbc control socket."""
import socket, sys, struct
def main():
sock, out = sys.argv[1], sys.argv[2]
c = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM); c.settimeout(6); c.connect(sock); c.recv(200)
def cmd(l):
c.sendall((l+"\n").encode()); b=b""
while b"\n" not in b: b+=c.recv(65536)
return b.split(b"\n",1)[0].decode()
def rd(a,n):
out=[]
while n>0:
k=min(4096,n); h=cmd(f"read 0x{a:04X} {k}").split()[-1]
out+=[int(h[i*2:i*2+2],16) for i in range(k)]; a+=k; n-=k
return out
reg=lambda a: rd(a,1)[0]
LCDC=reg(0xFF40);SCY=reg(0xFF42);SCX=reg(0xFF43);WY=reg(0xFF4A);WX=reg(0xFF4B)
cmd("write 0xFF4F 00"); v0=rd(0x8000,0x2000)
cmd("write 0xFF4F 01"); v1=rd(0x8000,0x2000)
cmd("write 0xFF4F 00"); oam=rd(0xFE00,0xA0)
vb=lambda bank,addr:(v0 if bank==0 else v1)[addr-0x8000]
bgmap=0x9C00 if (LCDC>>3)&1 else 0x9800
wmap =0x9C00 if (LCDC>>6)&1 else 0x9800
uns=(LCDC>>4)&1
ta=lambda idx:0x8000+idx*16 if uns else 0x9000+((idx^0x80)-0x80)*16
shade=[255,170,85,0]
fb=[[255]*160 for _ in range(144)]
def fetch(mapbase,mx,my):
ent=mapbase+(my//8)*32+(mx//8)
idx=vb(0,ent);attr=vb(1,ent)
bank=(attr>>3)&1;xf=(attr>>5)&1;yf=(attr>>6)&1
a=ta(idx); ry=(7-(my%8)) if yf else (my%8); rx=(7-(mx%8)) if xf else (mx%8)
b1=vb(bank,a+ry*2);b2=vb(bank,a+ry*2+1)
return shade[((b1>>(7-rx))&1)|(((b2>>(7-rx))&1)<<1)]
winon=(LCDC>>5)&1
for sy in range(144):
for sx in range(160):
if winon and sy>=WY and sx>=WX-7:
fb[sy][sx]=fetch(wmap,sx-(WX-7),sy-WY)
elif LCDC&1:
fb[sy][sx]=fetch(bgmap,(sx+SCX)&0xFF,(sy+SCY)&0xFF)
h=16 if (LCDC>>2)&1 else 8
if (LCDC>>1)&1:
for i in range(40):
y=oam[i*4]-16;x=oam[i*4+1]-8;t=oam[i*4+2];a=oam[i*4+3]
bank=(a>>3)&1;xf=(a>>5)&1;yf=(a>>6)&1
if h==16:t&=0xFE
for part in range(h//8):
tp=t+(part if not yf else (h//8-1-part))
base=0x8000+tp*16
for ty in range(8):
ry=7-ty if yf else ty
b1=vb(bank,base+ry*2);b2=vb(bank,base+ry*2+1)
yy=y+part*8+ty
if 0<=yy<144:
for tx in range(8):
rx=7-tx if xf else tx
val=((b1>>(7-rx))&1)|(((b2>>(7-rx))&1)<<1)
if val==0: continue
xx=x+tx
if 0<=xx<160: fb[yy][xx]=shade[val]
W,H=160,144;rowpad=(-W*3)%4;data=bytearray()
for ry in range(H-1,-1,-1):
for x in range(W):
g=fb[ry][x];data+=bytes((g,g,g))
data+=b"\x00"*rowpad
hdr=b"BM"+struct.pack("<IHHI",54+len(data),0,0,54)+struct.pack("<IiiHHIIiiII",40,W,H,1,24,0,len(data),2835,2835,0,0)
open(out,"wb").write(hdr+data)
print(f"saved {out} (map=0x{reg(0xD35D):02X} pos {reg(0xD360)},{reg(0xD361)})")
if __name__=="__main__": main()
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