Function loadMap

source/core/maploader.cpp:469–561

}

void loadMap(const char* filename, int flags, DVector3* pos, int16_t* ang, sectortype** cursect, SpawnSpriteDef& sprites)
{
	FileReader fr = fileSystem.OpenFileReader(filename);
	if (!fr.isOpen()) I_Error("Unable to open map %s", filename);
	int mapversion = fr.ReadInt32();
	if (mapversion < 5 || mapversion > 9) // 9 is most likely useless but let's try anyway.
	{
		I_Error("%s: Invalid map format, expected 5-9, got %d", filename, mapversion);
	}

	pos->X = fr.ReadInt32() * maptoworld;
	pos->Y = fr.ReadInt32() * maptoworld;
	pos->Z = fr.ReadInt32() * zmaptoworld;
	*ang = fr.ReadInt16() & 2047;

	int cursectnum = fr.ReadUInt16();

	// Get the basics out before loading the data so that we can set up the global storage.
	unsigned numsectors = fr.ReadUInt16();
	auto sectorpos = fr.Tell();
	fr.Seek((mapversion == 5 ? sectorsize5 : mapversion == 6 ? sectorsize6 : sectorsize7) * numsectors, FileReader::SeekCur);
	unsigned numwalls = fr.ReadUInt16();
	auto wallpos = fr.Tell();
	fr.Seek((mapversion == 5 ? wallsize5 : mapversion == 6 ? wallsize6 : wallsize7)* numwalls, FileReader::SeekCur);
	int numsprites = fr.ReadUInt16();
	auto spritepos = fr.Tell();

	// Now that we know the map's size, set up the globals.
	allocateMapArrays(numwalls, numsectors, numsprites);
	sprites.sprites.Resize(numsprites);
	memset(sprites.sprites.Data(), 0, numsprites * sizeof(spritetype));

	// Now load the actual data.
	fr.Seek(sectorpos, FileReader::SeekSet);
	for (unsigned i = 0; i < sector.Size(); i++)
	{
		switch (mapversion)
		{
		case 5: ReadSectorV5(fr, sector[i]); break;
		case 6: ReadSectorV6(fr, sector[i]); break;
		default: ReadSectorV7(fr, sector[i]); break;
		}
		// If we do not do this here, we need to do a lot more contortions to exclude this default from getting written out to savegames.
		if (isExhumed())
		{
			sector[i].Sound = -1;
		}
	}

	fr.Seek(wallpos, FileReader::SeekSet);
	for (unsigned i = 0; i < wall.Size(); i++)
	{
		switch (mapversion)
		{
		case 5: ReadWallV5(fr, wall[i]); break;
		case 6: ReadWallV6(fr, wall[i]); break;
		default: ReadWallV7(fr, wall[i]); break;
		}