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Sparkle_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
XOR A
CP E
JP Z, =End_animation
LD (HL), E
LD A, $20
SUB E
LD E, A
.ADD_MOVING_ANIMATION_OFFSET
PUSH HL
LD HL, $mem_oam_buffer
LD A, $mem_oam_buffer_low
LD L, A
LD D, E
SRA D
LD A, C
SUB D
ADD $0c
LD (HL+), A
LD A, B
LD (HL+), A
LD A, E
SRA A
SRA A
AND $02
ADD $vram_animation_index
LD (HL+), A
LD A, $00
LD (HL+), A
SRA D
LD A, C
SUB D
ADD $08
LD (HL+), A
LD A, B
ADD $08
LD (HL+), A
LD A, E
SRA A
SRA A
AND $02
ADD $vram_animation_index
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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