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Rotation_Values:
.DB $F5, $0A, $F9, $0F, $FE, $13, $0A, $13, $0F, $0F, $13, $0A, $14, $04, $13, $FE, $0F, $F9, $0A, $F5, $04, $F4, $FE, $F5, $F9, $F9, $F5, $FE, $F4, $04, $F5, $0A
Rotating_Ball_Animation:
INC HL
LD A, (HL+)
ADD $80
LD D, A
LD A, $mem_viewport_x
LD B, A
SUB $82
CP D
RET NC
ADD $0e
CP D
RET C
LD A, D
SUB $80
SUB B
AND $0f
SWAP A
LD B, A
LD A, (HL+)
ADD $80
LD D, A
LD A, $mem_viewport_y
LD C, A
SUB $82
CP D
RET NC
ADD $0d
CP D
RET C
LD A, D
SUB $80
SUB C
AND $0f
SWAP A
ADD $06
LD C, A
LD E, (HL)
DEC E
CP E
JP C, =End_animation
LD (HL), E
LD A, $30
SUB E
LD E, A
LD A, E
AND $0f
SLA A
LD DE, =Rotation_Values
ADD E
LD E, A
LD A, D
ADC $00
LD D, A
.ADD_MOVING_ANIMATION_OFFSET
PUSH HL
LD HL, $mem_oam_buffer
LD A, $mem_oam_buffer_low
LD L, A
LD A, (DE)
ADD C
LD (HL+), A
INC DE
LD A, (DE)
ADD B
LD (HL+), A
LD A, $vram_animation_index+4
LD (HL+), A
LD A, $00
LD (HL+), A
LD A, L
LD $mem_oam_buffer_low, A
POP HL
RET
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