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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Usage: python3 mask.py [pokegold-spaceworld.map] [mask.png]
Generate a 2BPP visualizing the space used by each bank in the ROM.
"""
import sys
from mapreader import MapReader
def main():
mapfile = sys.argv[1] if len(sys.argv) >= 2 else 'pokegold-spaceworld.map'
filename = sys.argv[2] if len(sys.argv) >= 3 else 'mask.w1024.2bpp'
num_banks = 0x40
bank_mask = 0x3FFF
bank_size = 0x4000 # bytes
r = MapReader()
with open(mapfile, 'r', encoding='utf-8') as f:
l = f.readlines()
r.read_map_data(l)
default_bank_data = {'sections': [], 'used': 0, 'slack': bank_size}
with open(filename, 'wb') as f:
for bank in range(num_banks):
hits = bytearray([0x00] * bank_size)
data = r.bank_data['rom bank'].get(bank, default_bank_data)
for s in data['sections']:
if s['beg'] > s['end']:
continue
if s['beg'] == 0x0000 and s['end'] > 0xFFFF:
# https://github.com/gbdev/rgbds/issues/515
continue
beg = s['beg'] & bank_mask
end = s['end'] & bank_mask
for i in range(beg, end + 1):
hits[i] = 0xFF
f.write(hits)
if __name__ == '__main__':
main()
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