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#!/usr/bin/env python3
from argparse import ArgumentParser
import subprocess
import os
import json
__version__ = "1.0"
ld = os.environ.get("LD", "i586-pc-msdosdjgpp-ld")
strip = os.environ.get("STRIP", "i586-pc-msdosdjgpp-strip")
entity_types = (
"Player",
"Snake",
"Bat",
"Old",
"Bones",
"Time",
"Bonus",
"Pickaxe",
"GoldKey",
"SilverKey",
)
def get_layer(data, name):
for layer in data["layers"]:
if layer["name"] == name:
return layer
raise ValueError("Layer %r not found" % name)
def get_prop(data, name, default):
if "properties" not in data:
return default
for prop in data["properties"]:
if prop["name"] == name:
return prop["value"]
return default
def main():
parser = ArgumentParser(
description="Tiled JSON Map to .o",
epilog="Copyright (C) 2023 Juan J Martinez <jjm@usebox.net>",
)
parser.add_argument(
"--version", action="version", version="%(prog)s " + __version__
)
parser.add_argument(
"--max-ents",
dest="max_ents",
type=int,
default=None,
help="limit of entities in the map",
)
parser.add_argument("file_json", help="JSON map to convert")
parser.add_argument("output", help="object name for the map data")
args = parser.parse_args()
with open(args.file_json, "rt") as fd:
data = json.load(fd)
if len(data["tilesets"]) != 1:
parser.error("Unsupported number of tilesets %d" % len(data["tilesets"]))
tileset = data["tilesets"][0]
map_layer = get_layer(data, "Map")
out = list(map(lambda x: (x - tileset["firstgid"]) & 0xFF, map_layer["data"]))
gold_layer = get_layer(data, "Gold")
total_gold = 0
for t in gold_layer["data"]:
if t != 0:
total_gold += 1
if total_gold > 255:
parser.error("There are more than 255 gold pieces on the screen")
out.extend(map(lambda x: (x - tileset["firstgid"]) & 0xFF, gold_layer["data"]))
entity_layer = get_layer(data, "Entities")
# some entities will never change their y coordinate, so sorting them by y
# should help the drawing order in the game
objs_sorted = sorted(entity_layer["objects"], key=lambda o: o["y"])
if args.max_ents and len(objs_sorted) > args.max_ents:
parser.error("Too many entities (limit: %s)" % args.max_ents)
for ent in objs_sorted:
try:
typ = entity_types.index(ent["name"])
except ValueError:
parser.error("Entity in map %r not found in entity types" % ent["name"])
x = ent["x"] // tileset["tilewidth"]
y = ent["y"] // tileset["tileheight"]
flags = 0
dir = get_prop(ent, "dir", "right")
if dir not in ("left", "right"):
parser.error("Invalid value for property dir: %r" % dir)
if dir == "left":
flags |= 1
out.extend([typ, x, y, flags])
# end of entity list
out.append(0xFF)
tmp = args.output.removesuffix(".o")
with open(tmp, "wb") as fd:
fd.write(bytearray(out))
fd.flush()
# create an object file from the binary
rc = subprocess.call(
[
ld,
"-r",
"-b",
"binary",
"-o",
args.output,
tmp,
]
)
os.unlink(tmp)
if rc != 0:
parser.error("Failed to run %s" % ld)
# strip unwanted symbols
rc = subprocess.call([strip, "-w", "-K", "*_%s_*" % tmp, args.output])
if rc != 0:
parser.error("Failed to run %s" % ld)
if __name__ == "__main__":
main()
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