Merge pull request #110 from ElectroDeoxys/master

Split Home bank

1 files changed, 65 insertions, 0 deletions

diff --git a/src/home/frames.asm b/src/home/frames.asm
new file mode 100644
index 0000000..c32053d
--- /dev/null
+++ b/src/home/frames.asm
@@ -0,0 +1,65 @@
+; calls DoFrame a times
+DoAFrames:
+.loop
+	push af
+	call DoFrame
+	pop af
+	dec a
+	jr nz, .loop
+	ret
+
+; updates background, sprites and other game variables, halts until vblank, and reads user input
+; if wDebugPauseAllowed is not 0, the game can be paused (and resumed) by pressing the SELECT button
+DoFrame:
+	push af
+	push hl
+	push de
+	push bc
+	ld hl, wDoFrameFunction ; context-specific function
+	call CallIndirect
+	call WaitForVBlank
+	call ReadJoypad
+	call HandleDPadRepeat
+	ld a, [wDebugPauseAllowed]
+	or a
+	jr z, .done
+	ldh a, [hKeysPressed]
+	and SELECT
+	jr z, .done
+.game_paused_loop
+	call WaitForVBlank
+	call ReadJoypad
+	call HandleDPadRepeat
+	ldh a, [hKeysPressed]
+	and SELECT
+	jr z, .game_paused_loop
+.done
+	pop bc
+	pop de
+	pop hl
+	pop af
+	ret
+
+; handle D-pad repeat counter
+; used to quickly scroll through menus when a relevant D-pad key is held
+HandleDPadRepeat:
+	ldh a, [hKeysHeld]
+	ldh [hDPadHeld], a
+	and D_PAD
+	jr z, .done
+	ld hl, hDPadRepeat
+	ldh a, [hKeysPressed]
+	and D_PAD
+	jr z, .dpad_key_held
+	ld [hl], 24
+	ret
+.dpad_key_held
+	dec [hl]
+	jr nz, .done
+	ld [hl], 6
+	ret
+.done
+	ldh a, [hKeysPressed]
+	and BUTTONS
+	ldh [hDPadHeld], a
+	ret