84 lines
842 B
ArmAsm
84 lines
842 B
ArmAsm
.if 0
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;======================
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; save bg 1x5
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;======================
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save_bg_1x5:
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ldx #0
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save_yloop:
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txa
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pha
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clc
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adc CURSOR_Y
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; calc GBASL/GBASH
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tax
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lda hposn_low,X
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sta GBASL
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lda hposn_high,X
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sta GBASH
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pla
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tax
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ldy CURSOR_X
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lda (GBASL),Y
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sta save_sprite_1x5,X
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inx
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cpx #5
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bne save_yloop
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rts
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;======================
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; restore bg 1x5
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;======================
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restore_bg_1x5:
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ldx #0
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restore_yloop:
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txa ; current row
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clc
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adc CURSOR_Y ; add in y start point
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; calc GBASL/GBASH using lookup table
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tay
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lda hposn_low,Y
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sta GBASL
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lda hposn_high,Y
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sta GBASH
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ldy CURSOR_X
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lda save_sprite_1x5,X
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sta (GBASL),Y
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inx
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cpx #5
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bne restore_yloop
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rts
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;====================
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; save area
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;====================
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save_sprite_1x5:
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.byte $00,$00,$00,$00,$00
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;ysave:
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;.byte $00
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;xsave:
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;.byte $00
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.endif
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