From 32b02147925566bac93bf71b002860335583574c Mon Sep 17 00:00:00 2001
From: ElectroDeoxys <ElectroDeoxys@gmail.com>
Date: Thu, 9 Sep 2021 08:51:12 +0100
Subject: Split home bank

---
 src/home/bg_map.asm | 117 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 117 insertions(+)
 create mode 100644 src/home/bg_map.asm

(limited to 'src/home/bg_map.asm')

diff --git a/src/home/bg_map.asm b/src/home/bg_map.asm
new file mode 100644
index 0000000..c49f179
--- /dev/null
+++ b/src/home/bg_map.asm
@@ -0,0 +1,117 @@
+; reads structs:
+;   x (1 byte), y (1 byte), data (n bytes), $00
+;   x (1 byte), y (1 byte), data (n bytes), $00
+;   ...
+;   $ff
+; for each struct, writes data to BGMap0-translated x,y
+WriteDataBlocksToBGMap0: ; 0695 (0:0695)
+	call WriteDataBlockToBGMap0
+	bit 7, [hl] ; check for $ff
+	jr z, WriteDataBlocksToBGMap0
+	ret
+
+; reads struct:
+;   x (1 byte), y (1 byte), data (n bytes), $00
+; writes data to BGMap0-translated x,y
+WriteDataBlockToBGMap0: ; 069d (0:069d)
+	ld b, [hl]
+	inc hl
+	ld c, [hl]
+	inc hl
+	push hl ; hl = addr of data
+	push bc ; b,c = x,y
+	ld b, -1
+.find_zero_loop
+	inc b
+	ld a, [hli]
+	or a
+	jr nz, .find_zero_loop
+	ld a, b ; length of data
+	pop bc ; x,y
+	push af
+	call BCCoordToBGMap0Address
+	pop af
+	ld b, a ; length of data
+	pop hl ; addr of data
+	or a
+	jr z, .move_to_next
+	push bc
+	push hl
+	call SafeCopyDataHLtoDE ; copy data to de (BGMap0 translated x,y)
+	pop hl
+	pop bc
+
+.move_to_next
+	inc b ; length of data += 1 (to account for the last $0)
+	ld c, b
+	ld b, 0
+	add hl, bc ; point to next structure
+	ret
+
+; writes a to [v*BGMap0 + BG_MAP_WIDTH * c + b]
+WriteByteToBGMap0: ; 06c3 (0:06c3)
+	push af
+	ld a, [wLCDC]
+	rla
+	jr c, .lcd_on
+	pop af
+	push hl
+	push de
+	push bc
+	push af
+	call BCCoordToBGMap0Address
+	pop af
+	ld [de], a
+	pop bc
+	pop de
+	pop hl
+	ret
+.lcd_on
+	pop af
+;	fallthrough
+
+; writes a to [v*BGMap0 + BG_MAP_WIDTH * c + b] during hblank
+HblankWriteByteToBGMap0: ; 06d9
+	push hl
+	push de
+	push bc
+	ld hl, wTempByte
+	push hl
+	ld [hl], a
+	call BCCoordToBGMap0Address
+	pop hl
+	ld b, 1
+	call HblankCopyDataHLtoDE
+	pop bc
+	pop de
+	pop hl
+	ret
+
+; copy a bytes of data from hl to vBGMap0 address pointed to by coord at bc
+CopyDataToBGMap0: ; 06ee (0:06ee)
+	push bc
+	push hl
+	push af
+	call BCCoordToBGMap0Address
+	pop af
+	ld b, a
+	pop hl
+	call SafeCopyDataHLtoDE
+	pop bc
+	ret
+
+; copy b bytes of data from hl to de
+; if LCD on, copy during h-blank only
+SafeCopyDataHLtoDE: ; 6fc (0:6fc)
+	ld a, [wLCDC]
+	rla
+	jr c, JPHblankCopyDataHLtoDE
+.lcd_off_loop
+	ld a, [hli]
+	ld [de], a
+	inc de
+	dec b
+	jr nz, .lcd_off_loop
+	ret
+JPHblankCopyDataHLtoDE: ; 0709 (0:0709)
+	jp HblankCopyDataHLtoDE
-- 
cgit v1.2.3


From 0017fc2d171c87d7bab4c9be90e1069ae95a8071 Mon Sep 17 00:00:00 2001
From: ElectroDeoxys <ElectroDeoxys@gmail.com>
Date: Thu, 9 Sep 2021 08:54:29 +0100
Subject: Remove home bank address comments

---
 src/home/bg_map.asm | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

(limited to 'src/home/bg_map.asm')

diff --git a/src/home/bg_map.asm b/src/home/bg_map.asm
index c49f179..43dfe7b 100644
--- a/src/home/bg_map.asm
+++ b/src/home/bg_map.asm
@@ -4,7 +4,7 @@
 ;   ...
 ;   $ff
 ; for each struct, writes data to BGMap0-translated x,y
-WriteDataBlocksToBGMap0: ; 0695 (0:0695)
+WriteDataBlocksToBGMap0:
 	call WriteDataBlockToBGMap0
 	bit 7, [hl] ; check for $ff
 	jr z, WriteDataBlocksToBGMap0
@@ -13,7 +13,7 @@ WriteDataBlocksToBGMap0: ; 0695 (0:0695)
 ; reads struct:
 ;   x (1 byte), y (1 byte), data (n bytes), $00
 ; writes data to BGMap0-translated x,y
-WriteDataBlockToBGMap0: ; 069d (0:069d)
+WriteDataBlockToBGMap0:
 	ld b, [hl]
 	inc hl
 	ld c, [hl]
@@ -49,7 +49,7 @@ WriteDataBlockToBGMap0: ; 069d (0:069d)
 	ret
 
 ; writes a to [v*BGMap0 + BG_MAP_WIDTH * c + b]
-WriteByteToBGMap0: ; 06c3 (0:06c3)
+WriteByteToBGMap0:
 	push af
 	ld a, [wLCDC]
 	rla
@@ -88,7 +88,7 @@ HblankWriteByteToBGMap0: ; 06d9
 	ret
 
 ; copy a bytes of data from hl to vBGMap0 address pointed to by coord at bc
-CopyDataToBGMap0: ; 06ee (0:06ee)
+CopyDataToBGMap0:
 	push bc
 	push hl
 	push af
@@ -113,5 +113,5 @@ SafeCopyDataHLtoDE: ; 6fc (0:6fc)
 	dec b
 	jr nz, .lcd_off_loop
 	ret
-JPHblankCopyDataHLtoDE: ; 0709 (0:0709)
+JPHblankCopyDataHLtoDE:
 	jp HblankCopyDataHLtoDE
-- 
cgit v1.2.3