Time of day palettes and fade functions

4 files changed, 120 insertions, 1 deletions

diff --git a/home/fade.asm b/home/fade.asm
new file mode 100644
index 0000000..e39bd83
--- /dev/null
+++ b/home/fade.asm
@@ -0,0 +1,95 @@
+include "constants.asm"
+
+if DEBUG
+SECTION "DMG Palette Fade Effect", ROM0 [$0343]
+else
+SECTION "DMG Palette Fade Effect", ROM0 [$0307]
+endc
+
+Function0343:: ; 0343
+	ld a, [wTimeOfDayPal]
+	ld b, a
+	ld hl, IncGradGBPalTable_11 ; $39f
+	ld a, l
+	sub b
+	ld l, a
+	jr nc, .okay
+	dec h
+.okay
+	ld a, [hli]
+	ld [rBGP], a
+	ld a, [hli]
+	ld [rOBP0], a
+	ld a, [hli]
+	ld [rOBP1], a
+	ret
+
+RotateFourPalettesRight::
+	ld hl, IncGradGBPalTable_08 ; $396
+	ld b, $4
+	jr RotatePalettesRight
+
+RotateThreePalettesRight::
+	ld hl, IncGradGBPalTable_13 ; $3a5
+	ld b, $3
+RotatePalettesRight:: ; 0366
+; Rotate palettes to the right and fill with loaded colors from the left
+; If we're already at the leftmost color, fill with the leftmost color
+.loop
+	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, .loop
+	ret
+
+RotateFourPalettesLeft::
+	ld hl, IncGradGBPalTable_12 - 1 ; $3a1
+	ld b, $4
+	jr RotatePalettesLeft
+
+RotateThreePalettesLeft::
+	ld hl, IncGradGBPalTable_15 - 1 ; $3aa
+	ld b, $3
+RotatePalettesLeft:: ; 0384
+; Rotate palettes to the left and fill with loaded colors from the right
+; If we're already at the rightmost color, fill with the rightmost color
+.loop
+	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, .loop
+	ret
+
+; IncGradGBPalTable_00:: db %11111111, %11111111, %11111111
+; IncGradGBPalTable_01:: db %11111110, %11111110, %11111110
+; IncGradGBPalTable_02:: db %11111001, %11111001, %11111001
+; IncGradGBPalTable_03:: db %11100100, %11100100, %11100100
+
+; IncGradGBPalTable_04:: db %11100100, %11100100, %11100100
+; IncGradGBPalTable_05:: db %10010000, %10010000, %10010000
+; IncGradGBPalTable_06:: db %01000000, %01000000, %01000000
+
+; IncGradGBPalTable_07:: db %00000000, %00000000, %00000000
+;                           bgp       obp1       obp2
+IncGradGBPalTable_08:: db %11111111, %11111111, %11111111
+IncGradGBPalTable_09:: db %11111110, %11111110, %11111000
+IncGradGBPalTable_10:: db %11111001, %11100100, %11100100
+IncGradGBPalTable_11:: db %11100100, %11010000, %11100000
+
+IncGradGBPalTable_12:: db %11100100, %11010000, %11100000
+IncGradGBPalTable_13:: db %10010000, %10000000, %10010000
+IncGradGBPalTable_14:: db %01000000, %01000000, %01000000
+
+IncGradGBPalTable_15:: db %00000000, %00000000, %00000000
diff --git a/home/rtc.asm b/home/rtc.asm
new file mode 100644
index 0000000..6179278
--- /dev/null
+++ b/home/rtc.asm
@@ -0,0 +1,20 @@
+include "constants.asm"
+
+if DEBUG
+SECTION "Time Of Day Palettes", ROM0 [$032B]
+else
+SECTION "Time Of Day Palettes", ROM0 [$02EF]
+endc
+
+UpdateTimeOfDayPalettes: ; 32b (0:032b)
+	ld a, [wVramState]
+	bit 0, a
+	ret z
+TimeOfDayPals::
+	callab _TimeOfDayPals ; Func_8c2e3
+	ret
+
+UpdateTimePals:: ; 33a
+	callab _UpdateTimePals ; Func_8c335
+	ret
+
diff --git a/shim.sym b/shim.sym
index ac185f2..2a3fc3f 100644
--- a/shim.sym
+++ b/shim.sym
@@ -1,5 +1,4 @@
 ; ROM0
-00:032b UpdateTimeOfDayPalettes
 00:0436 UpdateTime
 00:051C Reset
 00:0D0A LoadFont
@@ -170,6 +169,8 @@
 
 23:4000 AnimateTilesetImpl
 23:42dc UpdateTimeOfDayPal
+23:42e3 _TimeOfDayPals
+23:4335 _UpdateTimePals
 23:4354 ReplaceTimeOfDayPals
 23:4370 GetTimePalette
 23:44BE Function_8c4be
diff --git a/wram.asm b/wram.asm
index 8042d4d..c0b1f13 100644
--- a/wram.asm
+++ b/wram.asm
@@ -347,6 +347,9 @@ wPredefBC:: ; cd54
 wFarCallBCBuffer:: ; cd54
     dw
 
+    ds 3
+wVramState:: db
+
 SECTION "CD76", WRAM0[$CD76]
 
 wCurItem:: db ; cd76