warp: full quick-warp menu (B2)

SELECT in the overworld now opens a drawn town list (Pallet..Indigo) with a
moving cursor; A warps to the highlighted town via the fly-warp machinery, B
cancels. WarpMenu draws its box into wTileMap then replicates the tail of
DisplayTextIDInit (CopyScreenTileBufferToVRAM + hWY=0 + LoadFontTilePatterns +
hAutoBGTransferEnabled) so the menu is actually pushed to the screen - without
it the box drew into the shadow buffer but the overworld's direct-to-VRAM
scrolled map left it invisible. HandleMenuInput drives selection; the chosen
index maps through WarpMapTable to a map id.

1 files changed, 64 insertions, 6 deletions

diff --git a/engine/warp_menu.asm b/engine/warp_menu.asm
index 17cc3904..d31aba45 100644
--- a/engine/warp_menu.asm
+++ b/engine/warp_menu.asm
@@ -1,17 +1,75 @@
 ; Quick-warp menu, opened with SELECT in the overworld (hooked in
-; home/overworld.asm). Reuses the game's fly-warp machinery: set the
-; destination map and the fly-warp flags, then return to the overworld loop,
-; which fades out and warps us in at the destination's fly coordinates.
+; home/overworld.asm). Draws a town list, and on selection reuses the game's
+; fly-warp machinery (wDestinationMap + BIT_FLY_WARP/BIT_USED_FLY); the
+; overworld loop then fades out and warps us in at the destination fly coords.
+
+DEF WARP_COUNT EQU 10
 
 SECTION "Warp Menu", ROMX
 
 WarpMenu::
-; B1 (pipeline validation): unconditionally warp to Pallet Town.
-	ld a, PALLET_TOWN
+	call SaveScreenTilesToBuffer2      ; stash the overworld so we can restore
+	hlcoord 0, 0
+	lb bc, 11, 11
+	call TextBoxBorder
+	hlcoord 2, 1
+	ld de, WarpMenuText
+	call PlaceString
+; push wTileMap to VRAM and switch on the menu/window display (the overworld
+; renders the scrolled map straight to VRAM, so without this our box drawn into
+; wTileMap would be invisible - mirrors the tail of DisplayTextIDInit)
+	ld b, HIGH(vBGMap1)
+	call CopyScreenTileBufferToVRAM
+	xor a
+	ldh [hWY], a
+	call LoadFontTilePatterns
+	ld a, $01
+	ldh [hAutoBGTransferEnabled], a
+	xor a
+	ld [wCurrentMenuItem], a
+	ld [wLastMenuItem], a
+	ld [wMenuWatchMovingOutOfBounds], a
+	ld [wMenuJoypadPollCount], a
+	inc a                              ; 1
+	ld [wTopMenuItemX], a              ; cursor column (text is at column 2)
+	ld [wTopMenuItemY], a              ; first item row
+	ld a, PAD_A | PAD_B
+	ld [wMenuWatchedKeys], a
+	ld a, WARP_COUNT - 1
+	ld [wMaxMenuItem], a
+	call HandleMenuInput
+	bit B_PAD_B, a
+	jr nz, .cancel
+; A pressed: look up the chosen map id and fire the fly-warp
+	ld a, [wCurrentMenuItem]
+	ld e, a
+	ld d, 0
+	ld hl, WarpMapTable
+	add hl, de
+	ld a, [hl]
 	ld [wDestinationMap], a
 	ld hl, wStatusFlags6
 	set BIT_FLY_WARP, [hl]
 	ASSERT wStatusFlags6 + 1 == wStatusFlags7
 	inc hl
 	set BIT_USED_FLY, [hl]
-	ret
+	ret                                ; overworld loop performs the warp
+.cancel
+	call LoadScreenTilesFromBuffer2
+	jp CloseTextDisplay                ; redraw the overworld and return
+
+WarpMenuText:
+	db   "PALLET"
+	next "VIRIDIAN"
+	next "PEWTER"
+	next "CERULEAN"
+	next "VERMILION"
+	next "CELADON"
+	next "FUCHSIA"
+	next "SAFFRON"
+	next "CINNABAR"
+	next "INDIGO@"
+
+WarpMapTable:
+	db PALLET_TOWN, VIRIDIAN_CITY, PEWTER_CITY, CERULEAN_CITY, VERMILION_CITY
+	db CELADON_CITY, FUCHSIA_CITY, SAFFRON_CITY, CINNABAR_ISLAND, INDIGO_PLATEAU