void PerformTileRelocation()
{
const int chrBankSize = 0x1000;
const int tileSize = 0x10;
byte[] CHR = new byte[chrBankSize];
var oBgPatterns = EnhancedPatternOffsets.GetBgBank(levelData.Index);
var bankCount = rom.ChrUsage.GetBgLastPage(levelData.Index) - rom.ChrUsage.GetBgFirstPage(levelData.Index) + 1;
// Re-arrange CHR ROM
for (int i = 0; i < bankCount; i++)
{
// Copy CHR bank
Array.Copy(rom.data, oBgPatterns, CHR, 0, chrBankSize);
// Paste new arrangement of tiles into ROM
for (int tile = 0; tile < 0x100; tile++)
{
byte tileIndex = tdArrangement.GetTile(tile);
Array.Copy(CHR, tileIndex * 0x10, rom.data, oBgPatterns, tileSize);
oBgPatterns += tileSize;
}
// oBgPatterns now points to next CHR bank
}
// Re-arrange combos (metatiles)
byte[] lookup = tdArrangement.CreateLookupTable();
// Assuming 256 combos
for (int i = 0; i < 0x100; i++)
{
var def = levelData.Combos[i];
def[0] = lookup[def[0]];
def[1] = lookup[def[1]];
def[2] = lookup[def[2]];
def[3] = lookup[def[3]];
}
}