mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-09-28 02:55:03 +00:00
157 lines
1.8 KiB
ArmAsm
157 lines
1.8 KiB
ArmAsm
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;======================
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; hgr 7x30 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_7x30:
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; set up pointers
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lda INL
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sta h730_smc1+1
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lda INH
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sta h730_smc1+2
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clc
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lda INL
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adc #30
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sta h730_smc3+1
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lda INH
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adc #0
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sta h730_smc3+2
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ldx #0
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hgr_7x30_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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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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h730_smc3:
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and $d000,X ; mask
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h730_smc1:
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ora $d000,X ; sprite
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sta (GBASL),Y
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inx
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cpx #30
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bne hgr_7x30_sprite_yloop
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rts
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;======================
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; save bg 7x30
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;======================
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save_bg_7x30:
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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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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_7x30,X
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inx
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cpx #30
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bne save_yloop
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rts
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;======================
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; restore bg 7x30
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;======================
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restore_bg_7x30:
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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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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 save_sprite_7x30,X
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sta (GBASL),Y
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inx
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cpx #30
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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_7x30:
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.byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
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.byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
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