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Zack Buhman 2025-08-30 23:23:33 -05:00
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README.rst Normal file
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===============
saturn-aseprite
===============
This is a humble conversion utility from ``.aseprite`` files to Sega Saturn VDP2
palette/character/pattern name table formats.
Python >= 3.7 is required.
Usage/example:
.. code::
python aseprite.py rustboro.aseprite
In the case of ``rustboro.aseprite`` (an Aseprite file with two tilesets and two
layers), the following files will be generated (also printed on stderr):
.. code::
palette.bin
character_pattern__tileset_0.bin
character_pattern__tileset_1.bin
pattern_name_table__layer_0.bin
pattern_name_table__layer_1.bin
The ``palette.bin`` and ``character_pattern__tileset_*.bin`` files can be
directly copied to VDP2 CRAM and VRAM
respectively. ``pattern_name_table__layer_*.bin`` need to be trivially modified
to point to the correct character addresses, as in:
.. code:: c
extern uint32_t size;
extern uint32_t * buf;
for (uint32_t i = 0; i < size / 4; i++) {
uint32_t data = buf[i];
uint32_t character_number = (data & 0x7fff) * 8 + character_offset;
uint32_t flags = data & 0xf0000000;
vdp2.vram.u32[(vram_offset / 4) + i] = flags | character_number;
}

2
aseprite.py
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@ -587,8 +587,6 @@ def pack_pattern_name_table_2x2(filename, cel_chunk):
y_flip = (tile_data & cel_chunk.data.bitmask_for_y_flip.value) != 0
pattern = (int(y_flip) << 31) | (int(x_flip) << 30) | tile_id
if x_flip or y_flip:
print("HERE", x_flip, y_flip, hex(pattern))
f.write(pack_index(pattern))