1 files changed, 73 insertions, 0 deletions
diff --git a/home/fade.asm b/home/fade.asm
new file mode 100644
index 00000000..9b55eaf2
--- /dev/null
+++ b/home/fade.asm
@@ -0,0 +1,73 @@
+; These routines manage gradual fading
+; (e.g., entering a doorway)
+LoadGBPal::
+	ld a, [wd35d] ;tells if cur.map is dark (requires HM5_FLASH?)
+	ld b, a
+	ld hl, FadePal4
+	ld a, l
+	sub b
+	ld l, a
+	jr nc, .ok
+	dec h
+.ok
+	ld a, [hli]
+	ld [rBGP], a
+	ld a, [hli]
+	ld [rOBP0], a
+	ld a, [hli]
+	ld [rOBP1], a
+	ret
+
+GBFadeOut1::
+	ld hl, FadePal1
+	ld b, 4
+	jr GBFadeOutCommon
+
+GBFadeOut2::
+	ld hl, FadePal6
+	ld b, 3
+
+GBFadeOutCommon::
+	ld a, [hli]
+	ld [rBGP], a
+	ld a, [hli]
+	ld [rOBP0], a
+	ld a, [hli]
+	ld [rOBP1], a
+	ld c, 8
+	call DelayFrames
+	dec b
+	jr nz, GBFadeOutCommon
+	ret
+
+GBFadeIn1::
+	ld hl, FadePal4 + 2
+	ld b, 4
+	jr GBFadeInCommon
+
+GBFadeIn2::
+	ld hl, FadePal7 + 2
+	ld b, 3
+
+GBFadeInCommon::
+	ld a, [hld]
+	ld [rOBP1], a
+	ld a, [hld]
+	ld [rOBP0], a
+	ld a, [hld]
+	ld [rBGP], a
+	ld c, 8
+	call DelayFrames
+	dec b
+	jr nz, GBFadeInCommon
+	ret
+
+FadePal1:: db %11111111, %11111111, %11111111
+FadePal2:: db %11111110, %11111110, %11111000
+FadePal3:: db %11111001, %11100100, %11100100
+FadePal4:: db %11100100, %11010000, %11100000
+;                rBGP      rOBP0      rOBP1
+FadePal5:: db %11100100, %11010000, %11100000
+FadePal6:: db %10010000, %10000000, %10010000
+FadePal7:: db %01000000, %01000000, %01000000
+FadePal8:: db %00000000, %00000000, %00000000