178 lines
1.9 KiB
ArmAsm
178 lines
1.9 KiB
ArmAsm
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;======================
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; hgr 14x14 draw sprite
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;======================
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; SPRITE in INL/INH
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; Location at CURSOR_X CURSOR_Y
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; left sprite AT INL/INH
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; right sprite at INL/INH + 14
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; left mask at INL/INH + 28
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; right mask at INL/INH + 42
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hgr_draw_sprite_14x14:
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; set up pointers
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lda INL
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sta hds_smc1+1
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lda INH
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sta hds_smc1+2
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clc
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lda INL
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adc #14
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sta hds_smc2+1
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lda INH
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adc #0
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sta hds_smc2+2
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clc
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lda INL
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adc #28
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sta hds_smc3+1
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lda INH
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adc #0
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sta hds_smc3+2
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clc
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lda INL
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adc #42
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sta hds_smc4+1
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lda INH
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adc #0
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sta hds_smc4+2
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ldx #0
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hgr_14x14_sprite_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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ldx #0
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ldy #0
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; calc GBASL/GBASH
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jsr HPOSN ; (Y,X),(A) (values stored in HGRX,XH,Y)
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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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hds_smc3:
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and point_mask_l,X
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hds_smc1:
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ora point_sprite_l,X
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sta (GBASL),Y
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iny
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lda (GBASL),Y
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hds_smc4:
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and point_mask_r,X
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hds_smc2:
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ora point_sprite_r,X
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sta (GBASL),Y
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inx
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cpx #14
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bne hgr_14x14_sprite_yloop
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rts
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;======================
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; save bg 14x14
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;======================
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save_bg_14x14:
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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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ldx #0
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ldy #0
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; calc GBASL/GBASH
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jsr HPOSN ; (Y,X),(A) (values stored in HGRX,XH,Y)
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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_left_14x14,X
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iny
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lda (GBASL),Y
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sta save_right_14x14,X
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inx
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cpx #14
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bne save_yloop
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rts
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;======================
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; restore bg 14x14
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;======================
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restore_bg_14x14:
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ldx #0
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restore_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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ldx #0
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ldy #0
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; calc GBASL/GBASH
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jsr HPOSN ; (Y,X),(A) (values stored in HGRX,XH,Y)
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pla
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tax
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ldy CURSOR_X
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lda save_left_14x14,X
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sta (GBASL),Y
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iny
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lda save_right_14x14,X
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sta (GBASL),Y
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inx
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cpx #14
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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_right_14x14:
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.byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
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save_left_14x14:
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.byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
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