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add support for more background modes

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This commit is contained in:
Zack Buhman 2026-01-06 11:20:27 -06:00
parent dd70828576
commit 78b78e2e0f
1 changed files with 45 additions and 22 deletions
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67
background.py
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@ -27,23 +27,31 @@ def pack_bgr555(red, green, blue):
# 2x2
def pack_index_2word(y_flip, x_flip, id):
tile_id = id * 8
def pack_index_2word(character_size, y_flip, x_flip, id):
tile_id = id * character_size
assert tile_id < 0x7fff, tile_id
pattern = (int(y_flip) << 31) | (int(x_flip) << 30) | tile_id
return struct.pack(">I", pattern)
def pack_index_1word(y_flip, x_flip, id):
tile_id = (id * 8) >> 2
def pack_index_1word(character_size, y_flip, x_flip, id):
if character_size == 8:
# 2x2 cell
tile_id = (id * character_size) >> 2
elif character_size == 2:
# 1x1 cell
tile_id = (id * character_size) >> 0
else:
assert False, character_size
assert tile_id < 0x3ff, tile_id
pattern = (int(y_flip) << 11) | (int(x_flip) << 10) | tile_id
return struct.pack(">H", pattern)
def pack_index(y_flip, x_flip, id):
def pack_index(character_size, y_flip, x_flip, id):
if PNB == "2WORD":
return pack_index_2word(y_flip, x_flip, id)
return pack_index_2word(character_size, y_flip, x_flip, id)
else:
return pack_index_1word(y_flip, x_flip, id)
return pack_index_1word(character_size, y_flip, x_flip, id)
def pack_old_palette_chunk(old_palette_chunk):
with open("palette.bin", "wb") as f:
@ -66,10 +74,6 @@ def pack_palette(f, palette):
assert False, type(palette)
def pack_character_2x2(tileset_chunk, offset):
#tileset_chunk.number_of_tiles,
#tileset_chunk.tile_width,
#tileset_chunk.tile_height,
assert tileset_chunk.tile_width == 16
assert tileset_chunk.tile_height == 16
assert type(tileset_chunk.data) == TilesetChunkInternal
@ -115,7 +119,20 @@ def pack_character_patterns(f, tileset_chunk):
f.write(buf)
def pack_pattern_name_table(f, cel_chunk, x_cells, y_cells):
def tileset_chunk_character_size(tileset_chunk):
# assumes 256 color
if tileset_chunk.tile_width == 8 and tileset_chunk.tile_height == 8:
return 2
elif tileset_chunk.tile_width == 16 and tileset_chunk.tile_height == 16:
return 8
else:
assert False, (tileset_chunk.tile_width, tileset_chunk.tile_height)
def pack_pattern_name_table(f, cel_chunk, tileset_chunk):
x_cells = 64 // (tileset_chunk.tile_width // 8)
y_cells = 64 // (tileset_chunk.tile_height // 8)
character_size = tileset_chunk_character_size(tileset_chunk)
assert type(cel_chunk.data) == CelChunk_CompressedTilemap
#assert cel_chunk.data.width_in_number_of_tiles <= 64
#assert cel_chunk.data.height_in_number_of_tiles <= 64
@ -140,7 +157,7 @@ def pack_pattern_name_table(f, cel_chunk, x_cells, y_cells):
tx = (h_page * x_cells) + x
ty = (v_page * y_cells) + y
if tx >= tile_width or ty >= tile_height:
f.write(pack_index(0, 0, 0))
f.write(pack_index(0, 0, 0, 0))
else:
cel_chunk_ix = ty * tile_width + tx
tile_data = cel_chunk.data.tile[cel_chunk_ix]
@ -149,7 +166,7 @@ def pack_pattern_name_table(f, cel_chunk, x_cells, y_cells):
x_flip = (tile_data & cel_chunk.data.bitmask_for_x_flip.value) != 0
y_flip = (tile_data & cel_chunk.data.bitmask_for_y_flip.value) != 0
f.write(pack_index(y_flip, x_flip, tile_id))
f.write(pack_index(character_size, y_flip, x_flip, tile_id))
def generate_separate_files(mem):
tilesets, layers, palette, cel_chunks = parse_file(mem)
@ -166,15 +183,12 @@ def generate_separate_files(mem):
for layer_index, cel_chunk in sorted(cel_chunks.items(), key=itemgetter(0)):
#layers[layer_index]
print(f"layer={layer_index} layer_name={layers[layer_index].layer_name} tileset={layers[layer_index].tileset_index}");
tileset_chunk = tilesets[layers[layer_index].tileset_index]
x_cells = 64 // (tileset_chunk.tile_width // 8)
y_cells = 64 // (tileset_chunk.tile_height // 8)
filename = f"pattern_name_table__layer_{layer_index}.bin"
print(filename)
with open(filename, "wb") as f:
pack_pattern_name_table(f, cel_chunk, x_cells, y_cells)
tileset_chunk = tilesets[layers[layer_index].tileset_index]
pack_pattern_name_table(f, cel_chunk, tileset_chunk)
PNCN0__N0PNB__2WORD = (0 << 15) # PNB_2WORD
PNCN0__N0PNB__1WORD = (1 << 15) # PNB_1WORD
@ -204,6 +218,17 @@ def header_7shades(size_of_cel_data, # bytes
width = 1
height = 1
print("7shades:\n"
f" file_type_id: {file_type_id}\n"
f" size_of_cel_data: {size_of_cel_data}\n"
f" size_of_map_data: {size_of_map_data}\n"
f" tile_character_size: {tile_character_size}\n"
f" tile_color_mode: {tile_color_mode}\n"
f" plane_size: {plane_size}\n"
f" map_data: {map_data}\n"
f" width: {width}\n"
f" height: {height}\n")
return struct.pack(">IIIIIIIHH",
file_type_id,
size_of_cel_data,
@ -249,9 +274,7 @@ def generate_7shades(mem, output_filename):
pattern_name_tables_start = f_tmp.getbuffer().nbytes
for layer_index, cel_chunk in sorted(cel_chunks.items(), key=itemgetter(0)):
tileset_chunk = tilesets[layers[layer_index].tileset_index]
x_cells = 64 // (tileset_chunk.tile_width // 8)
y_cells = 64 // (tileset_chunk.tile_height // 8)
pack_pattern_name_table(f_tmp, cel_chunk, x_cells, y_cells)
pack_pattern_name_table(f_tmp, cel_chunk, tileset_chunk)
break
pattern_name_tables_end = f_tmp.getbuffer().nbytes
size_of_map_data = pattern_name_tables_end - pattern_name_tables_start