191 lines
2.3 KiB
ArmAsm
191 lines
2.3 KiB
ArmAsm
;===============================
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; hgr 14x14 draw sprite with mask
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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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; sprite AT INL/INH
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; mask at INL/INH + 28
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hgr_draw_sprite_14x14:
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; set up sprite pointers
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lda INL
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sta h1414_smc1+1
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sta h1414_smc2+1
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lda INH
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sta h1414_smc1+2
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sta h1414_smc2+2
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; clc
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; lda INL
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; adc #1
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; sta h1414_smc2+1
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; lda INH
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; adc #0
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; sta h1414_smc2+2
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; set up mask pointers
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clc
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lda INL
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adc #28
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sta h1414_smc3+1
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sta h1414_smc4+1
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lda INH
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adc #0
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sta h1414_smc3+2
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sta h1414_smc4+2
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; clc
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; lda INL
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; adc #29
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; sta h1414_smc4+1
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; lda INH
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; adc #0
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; sta h1414_smc4+2
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ldx #0 ; X is pointer offset
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stx MASK ; actually counter
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hgr_14x14_sprite_yloop:
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lda MASK
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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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h1414_smc3:
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and $d000,X ; mask with sprite mask
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h1414_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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iny
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lda (GBASL),Y ; load background
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h1414_smc4:
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and $d000,X ; mask with sprite mask
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h1414_smc2:
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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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inc MASK
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lda MASK
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h1414_smc_len:
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cmp #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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lsr
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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_14x14,X
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iny
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inx
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lda (GBASL),Y
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sta save_sprite_14x14,X
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inx
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cpx #28
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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 ; current row
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lsr
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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_14x14,X
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sta (GBASL),Y
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inx
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iny
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lda save_sprite_14x14,X
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sta (GBASL),Y
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inx
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cpx #28
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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_14x14:
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.byte $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
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.byte $00,$00,$00,$00,$00,$00,$00,$00
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