1 files changed, 114 insertions, 0 deletions
diff --git a/src/engine/intro.asm b/src/engine/intro.asm
new file mode 100644
index 0000000..8a16b3a
--- /dev/null
+++ b/src/engine/intro.asm
@@ -0,0 +1,114 @@
+PlayIntroSequence:
+	call DisableLCD
+	farcall Func_10a9b
+	farcall Func_10000
+	call Func_3ca0
+	ld hl, HandleAllSpriteAnimations
+	call SetDoFrameFunction
+	call LoadTitleScreenSprites
+
+	ld a, LOW(IntroSequence)
+	ld [wSequenceCmdPtr + 0], a
+	ld a, HIGH(IntroSequence)
+	ld [wSequenceCmdPtr + 1], a
+
+	xor a
+	ld [wd317], a
+	ld [wIntroSequencePalsNeedUpdate], a
+	ld [wSequenceDelay], a
+	farcall FlashWhiteScreen
+
+.loop_cmds
+	call DoFrameIfLCDEnabled
+	call UpdateRNGSources
+	ldh a, [hKeysPressed]
+	and A_BUTTON | START
+	jr nz, .jump_to_title_screen
+	ld a, [wIntroSequencePalsNeedUpdate]
+	or a
+	jr z, .no_pal_update
+	farcall Func_10d74
+.no_pal_update
+	call ExecuteIntroSequenceCmd
+	ld a, [wSequenceDelay]
+	cp $ff
+	jr nz, .loop_cmds
+	jr .asm_1d39f
+
+.jump_to_title_screen
+	call AssertSongFinished
+	or a
+	jr nz, .asm_1d39f
+	call DisableLCD
+	ld a, MUSIC_TITLESCREEN
+	call PlaySong
+	lb bc, 0, 0
+	ld a, SCENE_TITLE_SCREEN
+	call LoadScene
+	call IntroSequenceEmptyFunc
+.asm_1d39f
+	call Func_3ca0
+	call .ShowPressStart
+	call EnableLCD
+	ret
+
+.ShowPressStart
+	ld a, SPRITE_PRESS_START
+	farcall CreateSpriteAndAnimBufferEntry
+	ld c, SPRITE_ANIM_COORD_X
+	call GetSpriteAnimBufferProperty
+	ld a, 48
+	ld [hli], a ; x
+	ld a, 112
+	ld [hl], a ; y
+	ld c, SPRITE_ANIM_190
+	ld a, [wConsole]
+	cp CONSOLE_CGB
+	jr nz, .asm_1d3c5
+	ld c, SPRITE_ANIM_191
+.asm_1d3c5
+	ld a, c
+	ld bc, 60
+	farcall Func_12ac9
+	ret
+
+LoadTitleScreenSprites:
+	xor a
+	ld [wd4ca], a
+	ld [wd4cb], a
+	ld a, PALETTE_30
+	farcall LoadPaletteData
+
+	ld bc, 0
+	ld de, wTitleScreenSprites
+.loop_load_sprites
+	push bc
+	push de
+	ld hl, .TitleScreenSpriteList
+	add hl, bc
+	ld a, [hl]
+	farcall CreateSpriteAndAnimBufferEntry
+	ld a, [wWhichSprite]
+	ld [de], a
+	call GetFirstSpriteAnimBufferProperty
+	inc hl
+	ld a, [hl] ; SPRITE_ANIM_ATTRIBUTES
+	or c
+	ld [hl], a
+	pop de
+	pop bc
+	inc de
+	inc c
+	ld a, c
+	cp $7
+	jr c, .loop_load_sprites
+	ret
+
+.TitleScreenSpriteList
+	db SPRITE_GRASS
+	db SPRITE_FIRE
+	db SPRITE_WATER
+	db SPRITE_COLORLESS
+	db SPRITE_LIGHTNING
+	db SPRITE_PSYCHIC
+	db SPRITE_FIGHTING