void SetTileset(int index)
{
tilesetHeaderGroup = Project.GetIndexedDataType<TilesetHeaderGroup>(index);
// Generate usedTileList for quick lookup of which metatiles use
// which 4 gameboy tiles
for (int j=0; j<256; j++)
usedTileList[j] = new List<byte>();
for (int j=0; j<256; j++) {
// j = index of metatile
bool[] used = new bool[256];
for (int k=0; k<4; k++) {
int tile = tilesetHeaderGroup.GetMappingsData(j*8+k);
if (!used[tile]) {
usedTileList[tile].Add((byte)j);
used[tile] = true;
}
}
}
InvalidateAllTiles();
}