Merge in dungeon map changes (#1)

known issues:
- in-room stairs in door shuffle draw slightly bugged sometimes
- entrance sprites in non-doors are sometimes drawn on the wrong floor
- in some modes, sanctuary will open HC map instead of sewers/HC2 map

Reviewed-on: #1
Co-authored-by: Kara Alexandra <ardnaxelarak@gmail.com>
Co-committed-by: Kara Alexandra <ardnaxelarak@gmail.com>

gk/blink_loot.asm

@@ -0,0 +1,108 @@
+; we want the icons indicating what is left in a room to blink
+; but we don't want to redraw to BG1 every few frames
+; so we duplicate the left side of BG1 to a lower portion and just toggle vertical scroll
+
+BlinkLoot:
+	; do not show icons if we're scrolling
+	LDA.w $0210
+	BNE .hide
+
+	LDA.b FrameCounter
+	AND.b #$20
+	BEQ .show
+.hide
+	LDA.b #$01
+.show
+	STZ.b $E6
+	STA.w $E7
+	JSL $8AE96B
+	RTL
+
+StartDoubleWrite:
+	; what we wrote over
+	LDA.l DRMode
+	BEQ .draw
+
+	INC.w $020D ; next subsubmode
+	PLA : PLA : PLA ; pull our jump to here off the stack
+	PLB
+	RTL
+
+.draw
+	REP #$30
+	STZ.w GFXStripes
+
+	STZ.w $021B
+	RTL
+
+CheckDoubleWrite:
+	LDA.w $021C
+	BNE .done
+
+	LDA.b #$08
+	STA.w $021C
+	REP #$30
+	JML $8AE20B
+
+.done
+	; what we wrote over
+	REP #$10
+	LDY.w GFXStripes
+	LDA.b #$FF
+	JML $8AE2E7
+
+DrawMountain:
+	LDX.w GFXStripes
+	PHX
+	LDY.w #$0000
+.next_word
+	LDA.w $8AEFEF, Y
+	STA.w GFXStripes+2, X
+	INX : INX
+	INY : INY
+	CPY.w #$002A
+	BCC .next_word
+
+	PLY
+	LDA.w $021B
+	BEQ .done
+
+	; if second copy of mountain, adjust VRAM addresses
+	SEP #$20
+	LDA.w GFXStripes+$02, Y
+	ORA.w $021C
+	STA.w GFXStripes+$02, Y
+
+	LDA.w GFXStripes+$08, Y
+	ORA.w $021C
+	STA.w GFXStripes+$08, Y
+
+	LDA.w GFXStripes+$10, Y
+	ORA.w $021C
+	STA.w GFXStripes+$10, Y
+
+	LDA.w GFXStripes+$20, Y
+	ORA.w $021C
+	STA.w GFXStripes+$20, Y
+
+	LDA.w GFXStripes+$26, Y
+	ORA.w $021C
+	STA.w GFXStripes+$26, Y
+	REP #$20
+
+.done
+	RTL
+
+WriteBigEndianAddressX:
+	ORA.w $021B
+	XBA
+	STA.w GFXStripes+2, X
+	AND.w #$FFF7
+	RTL
+
+WriteBigEndianAddressY:
+	ORA.w $021B
+	XBA
+	STA.w GFXStripes+2, Y
+	AND.w #$FFF7
+	RTL