111 lines
1.5 KiB
NASM
111 lines
1.5 KiB
NASM
; we want the icons indicating what is left in a room to blink
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; but we don't want to redraw to BG1 every few frames
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; so we duplicate the left side of BG1 to a lower portion and just toggle vertical scroll
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BlinkLoot:
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; do not show icons if we're scrolling
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LDA.w $0210
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BNE .hide
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LDA.b FrameCounter
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AND.b #$20
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BEQ .show
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.hide
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LDA.b #$01
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.show
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STZ.b $E6
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STA.w $E7
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JSL $8AE96B
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RTL
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StartDoubleWrite:
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; what we wrote over
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LDA.l DRMode
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BEQ .draw
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LDA.l DungeonMapMode
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BNE .draw
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INC.w $020D ; next subsubmode
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PLA : PLA : PLA ; pull our jump to here off the stack
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PLB
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RTL
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.draw
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REP #$30
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STZ.w GFXStripes
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STZ.w $021B
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RTL
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CheckDoubleWrite:
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LDA.w $021C
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BNE .done
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LDA.b #$08
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STA.w $021C
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REP #$30
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JML $8AE20B
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.done
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; what we wrote over
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REP #$10
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LDY.w GFXStripes
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LDA.b #$FF
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JML $8AE2E7
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DrawMountain:
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LDX.w GFXStripes
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PHX
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LDY.w #$0000
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.next_word
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LDA.w $8AEFEF, Y
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STA.w GFXStripes+2, X
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INX : INX
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INY : INY
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CPY.w #$002A
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BCC .next_word
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PLY
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LDA.w $021B
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BEQ .done
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; if second copy of mountain, adjust VRAM addresses
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SEP #$20
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LDA.w GFXStripes+$02, Y
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ORA.w $021C
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STA.w GFXStripes+$02, Y
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LDA.w GFXStripes+$08, Y
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ORA.w $021C
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STA.w GFXStripes+$08, Y
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LDA.w GFXStripes+$10, Y
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ORA.w $021C
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STA.w GFXStripes+$10, Y
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LDA.w GFXStripes+$20, Y
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ORA.w $021C
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STA.w GFXStripes+$20, Y
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LDA.w GFXStripes+$26, Y
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ORA.w $021C
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STA.w GFXStripes+$26, Y
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REP #$20
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.done
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RTL
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WriteBigEndianAddressX:
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ORA.w $021B
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XBA
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STA.w GFXStripes+2, X
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AND.w #$FFF7
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RTL
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WriteBigEndianAddressY:
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ORA.w $021B
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XBA
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STA.w GFXStripes+2, Y
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AND.w #$FFF7
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RTL
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