Reorganise some folders in engine/

1 files changed, 39 insertions, 0 deletions

diff --git a/src/engine/gfx/sprite_vblank.asm b/src/engine/gfx/sprite_vblank.asm
new file mode 100644
index 0000000..5f099a1
--- /dev/null
+++ b/src/engine/gfx/sprite_vblank.asm
@@ -0,0 +1,39 @@
+; empties screen and replaces
+; wVBlankFunctionTrampoline with HandleAllSpriteAnimations
+SetSpriteAnimationsAsVBlankFunction:
+	call EmptyScreen
+	call Set_OBJ_8x8
+	call Func_3ca4
+	lb de, $38, $7f
+	call SetupText
+	ld hl, wVBlankFunctionTrampoline + 1
+	ld de, wVBlankFunctionTrampolineBackup
+	call BackupVBlankFunctionTrampoline
+	di
+	ld [hl], LOW(HandleAllSpriteAnimations)
+	inc hl
+	ld [hl], HIGH(HandleAllSpriteAnimations)
+	ei
+	ret
+
+; sets backup VBlank function as wVBlankFunctionTrampoline
+RestoreVBlankFunction:
+	ld hl, wVBlankFunctionTrampolineBackup
+	ld de, wVBlankFunctionTrampoline + 1
+	call BackupVBlankFunctionTrampoline
+	call Func_3ca4
+	bank1call ZeroObjectPositionsAndToggleOAMCopy
+	ret
+
+; copies 2 bytes from hl to de while interrupts are disabled
+; used to load or store wVBlankFunctionTrampoline
+; to wVBlankFunctionTrampolineBackup
+BackupVBlankFunctionTrampoline:
+	di
+	ld a, [hli]
+	ld [de], a
+	inc de
+	ld a, [hld]
+	ld [de], a
+	ei
+	ret