mirror of
https://github.com/deater/dos33fsprogs.git
synced 2025-02-25 02:29:04 +00:00
139 lines
1.9 KiB
ArmAsm
139 lines
1.9 KiB
ArmAsm
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;===============================================
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; hgr 7x30 draw sprite, with bg mask in GR $400
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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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; for now, BG mask is only all or nothing
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; so we just skip drawing if behind
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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 ; X is row counter
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hgr_7x30_sprite_yloop:
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txa ; X is current row
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clc
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adc CURSOR_Y ; add in cursor_y
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; calc GBASL/GBASH
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tay ; get output ROW into GBASL/H
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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 (GBASL),Y ; load background
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h730_smc3:
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and $d000,X ; mask with sprite mask
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h730_smc1:
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ora $d000,X ; or in sprite
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sta (GBASL),Y ; store out
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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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; 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_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 ; 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_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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