58 lines
1.7 KiB
Python
58 lines
1.7 KiB
Python
import struct
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from dataclasses import dataclass
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@dataclass
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class RegionArrayTile:
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last_region: int
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z_clear: int
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flush_accumulate: int
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tile_y_position: int
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tile_x_position: int
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def __init__(self, value):
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assert (value >> 29) & 1 == 0, value
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assert (value >> 14) & 0x3fff == 0, value
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assert (value >> 0) & 0b11 == 0, value
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self.last_region = (value >> 31) & 0b1
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self.z_clear = (value >> 30) & 0b1
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self.flush_accumulate = (value >> 28) & 0b1
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self.tile_y_position = (value >> 8) & 0b111111
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self.tile_x_position = (value >> 2) & 0b111111
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@dataclass
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class RegionArrayPointer:
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empty_ptr: int
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pointer_to_object_list: int
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def __init__(self, value):
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assert (value >> 24) & 0x7f == 0
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assert (value >> 0) & 0b11 == 0
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self.empty_ptr = (value >> 31) & 1
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self.pointer_to_object_list = value & 0xffffff
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@dataclass
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class RegionArrayEntry:
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tile: RegionArrayTile
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opaque_list_pointer: RegionArrayPointer
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opaque_modifier_volume_list_pointer: RegionArrayPointer
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translucent_list_pointer: RegionArrayPointer
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translucent_modifier_volume_list_pointer: RegionArrayPointer
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punch_through_list_pointer: RegionArrayPointer
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def decode_region_array_entry(mem, offset):
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next_offset = offset + 6 * 4
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tile, *pointers = struct.unpack("<IIIIII", mem[offset:next_offset])
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return next_offset, RegionArrayEntry(
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RegionArrayTile(tile),
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*map(RegionArrayPointer, pointers),
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)
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def decode_region_array_entries(mem, offset):
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entries = []
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while True:
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offset, entry = decode_region_array_entry(mem, offset)
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entries.append(entry)
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if entry.tile.last_region:
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break
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return entries
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