Overworld HUD implementation (#15)

ram/hram.asm

@@ -148,7 +148,7 @@ if DEF(_DEBUG)
 hDebugRoomMenuPage:: db
 endc
 
-hWindowHUD::
+hWindowHUDLY::
 ; Window HUD is enabled when non-0.
 ; Its value indicates the last scanline that the window spans from the top.
 	db

ram/wram.asm

@@ -697,12 +697,11 @@ wPuzzlePieces:: ds 6 * 6
 ENDU
 
 
-SECTION "Unused Map Buffer", WRAM0
+SECTION "Overworld HUD", WRAM0
 
-; This was a buffer for map-related pointers in the 1997 G/S prototype.
-; See wMapBuffer in pokegold-spaceworld's wram.asm.
-wUnusedMapBuffer:: ds 24
-wUnusedMapBufferEnd::
+wOverworldHUDTiles:: ds SCREEN_WIDTH
+wOverworldHUDTilesEnd::
+	ds 4
 
 
 SECTION UNION "Overworld Map", WRAM0
@@ -933,8 +932,8 @@ SECTION "Video", WRAM0
 
 UNION
 ; bg map
-wBGMapBuffer::    ds 40
-wBGMapPalBuffer:: ds 40
+wBGMapBuffer::    ds 2 * SCREEN_WIDTH
+wBGMapPalBuffer:: ds 2 * SCREEN_WIDTH
 wBGMapBufferPointers:: ds 20 * 2
 wBGMapBufferEnd::
 
@@ -1276,6 +1275,10 @@ wMinutesSince:: db
 wHoursSince:: db
 wDaysSince:: db
 
+wWhichHUD::
+; index to LoadHUD
+	db
+
 
 SECTION "WRAM 1", WRAMX