Nightshade: Routine at 52984

52984: Next Sprite Number

Moves an object on to the next of its four sprites, by adding one to the lowest two bits of the type and wrapping around.

Input
IX	Object

NextSpriteNumber

52984

LD A,(IX+0)

Add one to the lowest two bits of the type, wrapping round, to choose the next sprite.

52987

LD C,A

52988

INC A

52989

AND 3

52991

LD B,A

52992

LD A,C

Put them back in the type of the object.

52993

AND 252

52995

OR B

52996

LD (IX+0),A

52999

RET

Return.

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