48 /* This takes value (probably of the variable specified in the group) and

    49  * chooses corresponding SpriteGroup accordingly to the given

    50  * DeterministicSpriteGroup. */

    51 SpriteGroup *EvalDeterministicSpriteGroup(const DeterministicSpriteGroup *dsg, int value);

    52 /* Get value of a common deterministic SpriteGroup variable. */

    53 int GetDeterministicSpriteValue(byte var);

    54 

    55 /* This takes randomized bitmask (probably associated with

    56  * vehicle/station/whatever) and chooses corresponding SpriteGroup

    57  * accordingly to the given RandomizedSpriteGroup. */

    58 SpriteGroup *EvalRandomizedSpriteGroup(const RandomizedSpriteGroup *rsg, byte random_bits);

    59 /* Triggers given RandomizedSpriteGroup with given bitmask and returns and-mask

    60  * of random bits to be reseeded, or zero if there were no triggers matched

    61  * (then they are |ed to @waiting_triggers instead). */

    62 byte RandomizedSpriteGroupTriggeredBits(const RandomizedSpriteGroup *rsg, byte triggers, byte *waiting_triggers);

    63