Persist level selection menu landmark when coming back (#12)

docs/develop/index.md

@@ -83,7 +83,6 @@
   - **wSpacesLeft**
 
 - Addresses within *wCurMapData* ~ *wCurMapDataEnd*: preserved on save. Initialized when entering a level (in StartMap), and updated accordingly throughout the level. Includes:
-  - **wCurLevel**: this one is not initialized in StartMap, but in LevelSelectionMenu (where it is also used), and stays static during the level.
   - **wCurTurn**
   - **wCurSpace**
   - **wCurLevelCoins**
@@ -98,6 +97,8 @@
   - **wUnlockedLevels**: flag array that tracks progression regarding which levels have been unlocked.
   - **wClearedLevelsStage<N>**: flag array that tracks progression regarding which levels have been cleared. Each level can have up to four clearable endings (N).
   - **wUnlockedTechniques**: flag array that tracks progression regarding which techniques have been unlocked.
+  - **wCurLevel**: initialized in LevelSelectionMenu (where it is also used), and stays static during the level.
+  - **wDefaultLevelSelectionMenuLandmark**: used to know in which landmark to place the player when entering level selection menu.
   - **wCurOverworldMiscPal**
 
 - These addresses share memory region with string buffers from *wStringBuffer3* onwards. They are placed in memory in the following order.

engine/menus/intro_menu.asm

@@ -26,6 +26,8 @@ if DEF(_DEBUG)
 	ld a, -1
 	ld [wUnlockedLevels], a ; debug
 endc
+	xor a ; LANDMARK_LEVEL_1
+	ld [wDefaultLevelSelectionMenuLandmark], a
 	farcall AutoSaveGameOutsideOverworld
 	jp GameMenu
 

engine/menus/level_selection_menu.asm

@@ -17,7 +17,7 @@ LevelSelectionMenu::
 	ld a, LCDC_DEFAULT
 	ldh [rLCDC], a
 
-	xor a
+	ld a, [wDefaultLevelSelectionMenuLandmark]
 	ld [wLevelSelectionMenuCurrentLandmark], a
 	call LevelSelectionMenu_GetLandmarkPage
 	ld [wLevelSelectionMenuCurrentPage], a
@@ -1002,6 +1002,7 @@ _LevelSelectionMenuHandleTransition:
 ; set new landmark
 	ld a, [de]
 	ld [wLevelSelectionMenuCurrentLandmark], a
+	ld [wDefaultLevelSelectionMenuLandmark], a
 ; make the player sprite face down as the default state
 	ld hl, SPRITEANIMSTRUCT_ANIM_SEQ_ID
 	add hl, bc

ram/wram.asm

@@ -2543,6 +2543,8 @@ wRepelEffect:: db ; If a Repel is in use, it contains the nr of steps it's still
 wBikeStep:: dw
 wKurtApricornQuantity:: db
 
+wCurLevel:: db
+wDefaultLevelSelectionMenuLandmark:: db
 wCurOverworldMiscPal:: db
 
 wPlayerDataEnd::
@@ -2571,7 +2573,6 @@ wYCoord:: db
 wXCoord:: db
 wScreenSave:: ds SCREEN_META_WIDTH * SCREEN_META_HEIGHT
 
-wCurLevel:: db
 wCurTurn:: dw
 wCurSpace:: db
 wCurLevelCoins:: ds 3