Ranges:
0x000...0x07f (0...127): param2 is fully usable
126 and 127 are reserved (CONTENT_AIR and CONTENT_IGNORE).
- 0x800...0xfff (2048...4095): higher 4 bytes of param2 are not usable
+ 0x800...0xfff (2048...4095): higher 4 bits of param2 are not usable
*/
#define CONTENT_STONE 0
#define CONTENT_WATER 2