From c20a27f02e38fa09f5c8fec1b7cd7e1d2d9cf635 Mon Sep 17 00:00:00 2001
From: Jonatan Nilsson <jonatan@nilsson.is>
Date: Wed, 19 Jun 2019 15:07:02 +0000
Subject: [PATCH] Updated text renderer a bit

---
 assets/page1.chr        | Bin 4096 -> 4096 bytes
 assets/page1_backup.chr | Bin 0 -> 4096 bytes
 game/game.asm           |   9 +--
 game/text.asm           | 162 ++++++++++++++++++++++++----------------
 main.asm                |  21 +++++-
 main.o                  | Bin 7649 -> 8045 bytes
 test.gb                 | Bin 32768 -> 32768 bytes
 test.map                |  49 ++++++------
 test.sym                |  37 ++++-----
 tools.asm               |  16 ++++
 10 files changed, 177 insertions(+), 117 deletions(-)
 create mode 100644 assets/page1_backup.chr

diff --git a/assets/page1.chr b/assets/page1.chr
index bdd12507a23373f5c80fa0baa7ec38356f51a478..b98abcdebf8a30cb797be1beeea360ddeabbd15f 100644
GIT binary patch
literal 4096
zcmeHHy-!n76u<IeQK~c+Y()~9C<+ASMTzZD=^GqK)Yt(N;z9=p29mNEYIwvB9T-Sp
zAdyW524b8{M?&7<(3t)K#_0_XH8HU!L@Iglcs}0kdkxAzVDHJh@1FZRpTF~3rCJvl
zFasqNmv;pXe(PO98cZm%n0QuDhc&h+;k%By%b4C<^&;XH<NNGWK%H{wY$e7cpv6MH
zD<BQFUxQ890SEVW)TI{LUB;_W_M%d}5`2JN*g{*%qoB~lN_h7BlL$V(3)`?5z&E*1
zU4H?q5`U{%Emf`ik*@syNS{G&eY^}+u16!nx`GERqh3_vuM2umOCaym9|>i*y!=wP
z%!l%k2**WyYyQYu>J|SI&Q)-ksEg4_#Gg2_FbDBX@g+J%Ae_3?6Kd5R&%T7*Irxyh
zwv@NTU%+{Yh)(%LT6Nuz;8bxCrwT>i2b=5EIQ35)QT+<LYIxnHJ$s!^$0vQpn-6&i
zz6*1n{W@fk|15uR8rS@g?&5?D%t7-p(5uR_!1Fd>34a#`3*iOC;;7}YX3^In3@Lop
z`Fl*E|286V7K&}76cDd6PX0D_L^-H_7m+aAQVxkvh{ok)HT|hxksQ|G*OS0AJv46-
zI;*Bo^c-s`td_n=#*{L7`TrtWUcNrd%h#XsI;rb88rN~OuHy{wQcB-<^YZmGytE!w
z)6uJ4_oH`*(y_72`TmMZS3V`mm8#KS+gkX1z1g4c6v^Fz*RaueQzrp70C|xObV4_L
zg&)Je`bfme-{scd1=(o4#;7)iY3B3disg^tuNbwHV70ug)Y6jwkRH6#y1onQbPk2Y
zUhZFvPe#TEQn7S28J<Sc-_9QP%<c`<(v^zwC}pWmHQD*{_PyR@JTq`BHa}^rDf{B#
zyX=?v;a<6Rd>F(ZCo_FP{QWn#ei~k`{jP^pI)u4<UR}#4pCt1!TP5txTrE;Jb9UWv
z>>!?x9X&h^|C@j7d{-t~=lgLgh_6hnb_DT{QwL@yv>YE9oW7EYTngVAnpUp!Grl`#
zZM!`)#&hK7-}s_oA)oU%wf`OF_xOwN{{a1u9_Ay1-RI8sb@X<HLw(Az9b~{P7L{4t
zF&&kU4y*Hw4_@f)4z=J3w9QAqXP=FXo$z;5#Mv=zwc4TQ8x7yU`VY+3`DWDkz-Wx-
kFSx5__xfuz|0>t-{|?)yHUn)2+6=TAXfx1e;D2G@585Rjk^lez

literal 4096
zcmeHGzi%657=B3|Y{)@QIKd`F;v^_dqe4z4!XA$JkUCf@2oI@bvD5>Dhe*y+<xsD}
zg9i^cc*t;L1`iQpLLQ^)h7MMBe*j{-p@Rn`Ziwiq`h>XW`}+3o6zD&IAIaa{^FHtQ
z{yY;EVVdpsD1{I>iIN0QK8Y;Lwuch7ZCONdJRZYiG#ZcNm`DhSd=~j|NaVWEFD`Jy
zaftBbY{=)j`YX6DQ7MNcf&X|snVg+P(PZLzM2N-^0(uzEW-@4cfIoRMot~b09&AL8
z!<x#^ov9d^KArmh(NWg_WP(1qe#a@5)ct(Dx{iDqvi@Lew@owCXR|O=^(jS7o#>9l
z&W;)a=2t3JD!OhMwvGM(WOrSaU)8O;Kt4dtcsR`F2XEyM9WzK0rK^n!VM{<&y6cuo
zm^b39=!gInUGj>GJc^Y6Xyp4*<oobvPwodd`u)?F08{x8UB%Bh_oH@(ilzI@9il?T
zFD`-rb+V5BF(cGZWZOxiy2JMhs9f1Rz}qRXpG==lyIsXSuhTJ%P6yu`>pUNDAu1Kq
zRQoZ_Za0+Z_Yu!DkB{Tnl)(NRCk*R#)9m$vKylC0v}RM&JP-Xgo87MO3sILq>>!2X
zXj&LT$NeBk5~KhZLQ4T>q)<8(*43Nq@_pHWJbEdzdJKaIKRHHu;GJFp(czB@n@xO?
zEakr(*g6ud5*<op{GP;B&T&}hILtZDrUVh&S0yt3h6M8}9aKLoeO3Kp+p67sf3Ptp
zYyO)tn}_Dc;<W$!Cs*rW3+G|Zd6;vauL~eLK4uT~1kc-;vn|i@esZGx*$$q!F=tzz
z<Gox~{>uJfcTeBlY}Tx5Lpw+d`uXs(a(KSIu;z2~o2E<GXz$vOpMSa5sJAvhtKHuV
zXg_%O@|VuD`sMj-@!~SCf7@uS=k;Iz5b^8u+2ZfGOjbF~UHR$bLF2o|pcar3OnM7F
zwtGPwML}L4)Slmco&In4i~D_etGM5%`+5E0tw$?){ptQ=yH!4^U*9_Tprya3-QGSR
z5&c!4c3odo+U5`GeEwTMGTn5Z_iyn1+j71yo@Mv%r1ziS9q3!DZ@sy`vR2Z{>l6i1
zIsrTVYuUpyJEB4LBYIovTkou`mJ7O(`VOjpcD}!U^UD2*^ythE=+O%Ax2k=b*8kWp
t?zcs|n>#h^U+IDl&o>s>e<<rOeydBioWODd%Lyzeu$;hh0{@2z`~xVecrE|{

diff --git a/assets/page1_backup.chr b/assets/page1_backup.chr
new file mode 100644
index 0000000000000000000000000000000000000000..cb162dc3dbd51c2104105d87ed2347c4e450f136
GIT binary patch
literal 4096
zcmeHGzi%657=B4F*pP#qaDq*Uge7Q6qe4z4!XA$JkUCf@2oI@bvD8Bc50RV&<xsD}
zg9i^cc*t;U89YRY33-gF8#-9k{Q-#Sh7KN(xFMpa>JxC!_x0`FsnCA_KaM}&^FHtQ
z{=5(sVVdpsD1{I>iIN1rd=gofZ4V`E+p>t_csz#3Xfz(jF_91u`7H9`kjQnRUtHjZ
z;}GGOvmu}B8ZY3wL|P6>0{`)NGC4boqRGVbh!Bk-1oSYR&1BH@0DtsoIz2u0JlKdF
zhc%U-J5w<-eLD61qob_<$pn3J{f?t)>VCdn!$7_aS%0v#+oqZ6vsoCb`jn!kPIOCR
zXGaYI^V76)*)ZyL+eUu?vb(Ozuj*D^ARnM+JRD~8gSYaBju|A0($z+VuqB`>-E}n$
z^G19X9TA|SOI}ftN0IU$jeI|fd>{Vo$^GC)zkm81U@9M?tN0n`e$>uTv2=gFLsY2v
z#YGUHPS(*sW`z2QY&%I*cX(d`l`ESEcsm95lj+lGx2w44bvpHWr-S#6b)FBn5aqII
zs{NQ|w;M|I`-o?n$H#GON??DE6Na^#Y4&<Spt$Ghdb6qPo`-&$&2HECg{Vm&c96nx
zbUh5A<9-k%2~vOyp{IZ|QYak?>*~pM`MzvG9=#M<J@q;fzH*H6z%#u7qQf5*Hk)`O
zS<1gTuyrI@B|4PI_#KItImcn0<1ptqn-WB9UzN!CYZA;WbWnL;`=avMwpG3U?qFk1
z*8JD{Y#y2$i_`vZAN`$z(og#LqkI6#eX=?^4_i3Tmjw_VAG3%01<%`<vn|i@d~%}v
z*$$q!F=tzz<GEB){>uK{?w+x`*{oWXhJKJ1^wZ&G`S5&uVa?~}S523$(B75rKmB~I
zQEP2}QoXwu(0=gt<<FfbwafF_;@M?h|GLpy&+EVZF5*||v&CO=iL6qZyZpn4gT^<F
zK{cRyFzGFf*zN^!6a{&GP<?v)Rr<f(FYfpLjpBYE@8|XVHy*6y^~d`U?N;fec6ICE
zy_WHgeslYPMD%BE+I4+VZkzYg`TVzjWV-1*?|#hpZ_4>Tdy?J1mEM1Pdthv>zVZ6{
z%9^H^)+q|2bOLtzuVoL<?1%=H59m#)Z@sm)S}N%E)OS$%qx0?6>o47p$cWDDfF7*y
zek=O5wEl;7alb9v-Q1~S|4J8hc)qc~{zF-R@m*cA<ph=!SWaL$f#n326Zk(&;2+mK
Bh&ccN

literal 0
HcmV?d00001

diff --git a/game/game.asm b/game/game.asm
index 396c851..4263bf9 100644
--- a/game/game.asm
+++ b/game/game.asm
@@ -3,11 +3,6 @@ INCLUDE "game/text.asm"
 SECTION "Game Loop", ROM0
 
 GameLoop:
-.wait
-    ld a, [rLY] ; Load the current vertical line being rendered
-    cp 144 ; Check if we're past VBlank (1 to 144 = carry bit set)
-    jr c, .wait ; Jump back to waitVBlank if rLY is less than 144
-
     ld de, HelloWorldStr
     call StartText
 .mainloop
@@ -19,4 +14,6 @@ GameLoop:
 Section "Hello wrold string", ROM0
 
 HelloWorldStr:
-    db "Hello, Worl'd.!?", 0
+    ;  [                  ]
+    db "...wake up...\n"
+    db "please wake up...", 0
diff --git a/game/text.asm b/game/text.asm
index 25fde2b..dde4276 100644
--- a/game/text.asm
+++ b/game/text.asm
@@ -9,24 +9,62 @@ textwriter_active: ds 1
 SECTION "ram_textmap", ROM0,ALIGN[8]
 textwriter_map:
     ;   00  01  02  03  04  05  06  07  08  09  0A  0B  0C  0D  0E  0F
-    db $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00 ; 0
+    db $50,$50,$50,$50,$50,$50,$50,$50,$50,$50,$50,$50,$50,$50,$50,$50 ; 0
     ;   10  11  12  13  14  15  16  17  18  19  1A  1B  1C  1D  1E  1F
-    db $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00 ; 16
+    db $50,$50,$50,$50,$50,$50,$50,$50,$50,$50,$50,$50,$50,$50,$50,$50 ; 16
     ;   20  21  22  23  24  25  26  27  28  29  2A  2B  2C  2D  2E  2F
-    db $00,$41,$00,$00,$00,$00,$00,$43,$00,$00,$00,$00,$42,$00,$3F,$00 ; 32
+    db $50,$41,$50,$50,$50,$50,$50,$43,$50,$50,$50,$50,$42,$50,$3F,$50 ; 32
     ;   30  31  32  33  34  35  36  37  38  39  3A  3B  3C  3D  3E  3F
-    db $35,$36,$37,$38,$39,$3A,$3B,$3C,$3D,$3E,$00,$00,$00,$00,$00,$40 ; 48
+    db $35,$36,$37,$38,$39,$3A,$3B,$3C,$3D,$3E,$50,$50,$50,$50,$50,$40 ; 48
     ;   40  41  42  43  44  45  46  47  48  49  4A  4B  4C  4D  4E  4F
-    db $00,$01,$02,$03,$04,$05,$06,$07,$08,$09,$0A,$0B,$0C,$0D,$0E,$0F ; 64
+    db $50,$01,$02,$03,$04,$05,$06,$07,$08,$09,$0A,$0B,$0C,$0D,$0E,$0F ; 64
     ;   50  51  52  53  54  55  56  57  58  59  5A  5B  5C  5D  5E  5F
-    db $10,$11,$12,$13,$14,$15,$16,$17,$18,$19,$1A,$00,$00,$00,$00,$00 ; 80
+    db $10,$11,$12,$13,$14,$15,$16,$17,$18,$19,$1A,$50,$50,$50,$50,$50 ; 80
     ;   60  61  62  63  64  65  66  67  68  69  6A  6B  6C  6D  6E  6F
-    db $00,$1B,$1C,$1D,$1E,$1F,$20,$21,$22,$23,$24,$25,$26,$27,$28,$29 ; 96
+    db $50,$1B,$1C,$1D,$1E,$1F,$20,$21,$22,$23,$24,$25,$26,$27,$28,$29 ; 96
     ;   70  71  72  73  74  75  76  77  78  79  7A  7B  7C  7D  7E  7F
-    db $2A,$2B,$2C,$2D,$2E,$2F,$30,$31,$32,$33,$34,$00,$00,$00,$00,$00 ; 112
+    db $2A,$2B,$2C,$2D,$2E,$2F,$30,$31,$32,$33,$34,$50,$50,$50,$50,$50 ; 112
 
 SECTION "TextWriter", ROM0
 
+InitWindow:
+    ; Fill first line in window with straight line
+    ld hl, _SCRN1
+    ld b, $20
+    ld a, $52
+    call Memfill
+    ; Fill rest of the area with dark bg
+    ld b, $40
+    ld a, $50
+    call Memfill
+    ; Fill last line in window with straight line
+    ld b, $20
+    ld a, $57
+    call Memfill
+    ; Top left corner
+    ld hl, _SCRN1
+    ld [hl], $51
+    ; Top right corner
+    ld hl, _SCRN1 + 19
+    ld [hl], $53
+    ; Bottom Left corner
+    ld hl, _SCRN1 + $60
+    ld [hl], $56
+    ; Bottom Right corner
+    ld hl, _SCRN1 + $60 + 19
+    ld [hl], $58
+    ; Left line
+    ld hl, _SCRN1 + $20
+    ld [hl], $54
+    ld hl, _SCRN1 + $40
+    ld [hl], $54
+    ; Right line
+    ld hl, _SCRN1 + $20 + 19
+    ld [hl], $55
+    ld hl, _SCRN1 + $40 + 19
+    ld [hl], $55
+    ret ; Return
+
 ; Start to print a string on screen
 ; @param b - PosX on where to draw text
 ; @param c - PosY on where to draw text
@@ -57,19 +95,20 @@ StartText:
 DrawActiveText:
     ld a, [textwriter_active] ; Check if text is currently active
     and a
-    jr z, .exit
+    jp z, .exit
 
     ; Delay writing a letter by 10 frames
     ld a, [textwriter_curdelay]
     inc a
     ld [textwriter_curdelay], a
-    cp 20
+    cp 10
     jr c, .exit
 
     ; Reset the curdelay
     ld a, 0
     ld [textwriter_curdelay], a
 
+.startdrawtext
     ; Get the memory address pointing to the text currently being
     ; displayed. This is stored in textwriter_curtext
     ld hl, textwriter_curtext ; Get the memory address of the pointer
@@ -78,7 +117,7 @@ DrawActiveText:
     ld e, [hl] ; Store the next byte address to e
     ; We now have the current letter being drawn at [de]
 
-    ld hl, _SCRN0 ; Load the top-left map position to our map
+    ld hl, _SCRN1 ; Load the top-left map position to our map
     ld a, [textwriter_posy]
     ld c, a
     ld a, [textwriter_posx]
@@ -108,22 +147,54 @@ DrawActiveText:
     jr .movexaxis ; Repeat
 .drawletter
     ld a, [de] ; Load the first byte in the string
-    ld bc, textwriter_map
-    ld c, a
-    ld a, [bc]
-    ld [hl], a ; Print the character byte directly onto the map
+    ld bc, textwriter_map ; Get the map for the ASCII->Tile map
+    ld c, a ; Set the position of C to the ASCII byte of current character
+    ld a, [bc] ; Get the tile byte for the ASCII from the map
+    ld [hl], a ; Print the byte to the map
 
     ld a, [de]
     and a ; Check if we reached the end
-    jr nz, .continue
+    jr nz, .checkNewline
+
     ; We have reached the end of the string, disable textwriter
+    ld b, 0 ; Disable repeater
     ld a, 0
     ld [textwriter_active], a
+    jr .continue ; Jump straight to continue. No need to check anything
+
+.checkNewline
+    ld a, [de] ; Regrab the ascii byte we printed
+    cp a, $0A ; Check if it was a new line
+    jr nz, .checkRepeatOnce ; Jump to checkRepeatOnce if it wasn't a new line
+
+    ; The byte we printed was a new line so we increment Y position
+    ; and reset our X position.
+    ld a, 0 ; Usually we'd print into first position but since we're jumping
+            ; into continue, continue will automatically increment x for us.
+    ld [textwriter_posx], a
+    ld a, [textwriter_posy]
+    inc a
+    ld [textwriter_posy], a
+
+    ; We already know we printed empty character so we can skip checking
+    ; if we need to repeat once again and just set the b flag
+    ld b, 1
+    jr .continue
+
+.checkRepeatOnce
+    ld a, [bc] ; Regrab the tile we printer
+    ld b, 0 ; Use b as our marker if we should repeat once
+
+    ; Check if we printed an empty letter
+    cp a, $50
+    jr nz, .continue
+    ld b, 1
+
 .continue
     ; Time to update our work ram
-    ; Load the position pointer of current text to next letter
+    inc de ; Increment de to next letter
+    ; Load the position pointer of current text and update it to the next letter
     ld hl, textwriter_curtext
-    inc de ; Increment to next letter in string
     ld a, d
     ld [hli], a
     ld a, e
@@ -135,56 +206,15 @@ DrawActiveText:
     ; Update the current letter being drawn in ram
     ld a, [textwriter_curletter]
     inc a
+
+    ; Check if we need to repeat whole thing due to printing empty character
+    ld a, b
+    and b
+    jr nz, .startdrawtext
+
+    ; We didn't print an empty
     ld [textwriter_curletter], a
 
 .exit
     ld a, [textwriter_active]
     ret
-
-
-; Print String on screen
-; @param b - PosX on where to draw text
-; @param c - PosY on where to draw text
-; @param de - Address source string
-; @return a
-; @return b
-; @return c
-; @return hl - Destination memory in map
-; @return hl = Address Target to the byte after the last byte on the target (garbage)
-PrintString:
-    ld hl, _SCRN0 ; Load the top-left map position to our map
-.moveyaxis2
-    ; Our first objective is to position the text to correct position
-    ; We do so shifting the position by $20 for each y axis
-    ; and position by $01 for each x axis that needs movement
-    ld a, c ; Load the y position to our accumilator
-    and a ; Check if it's zero
-    jr z, .movexaxis2 ; Jump to x axis if it's zero and no moving necessary
-    ld a, l ; Load the first half of the destination position
-    add a, $20 ; Add $20 (one vertical line)
-    ld l, a ; Store the position back 
-    ld a, b ; Grab the second part of the address
-    adc a, $00 ; Add only the accumilator
-    ld b, a ; Store the position back
-    dec c ; Decrement our y parameter
-    jr .moveyaxis2 ; Repeat
-.movexaxis2
-    ; Now we check and move the position based on the x position
-    ld a, b ; Load the x position to our accimulator
-    and a ; Check if it's zero
-    jr z, .start2 ; Jump to start2 if it's zero already
-    inc hl ; Increment the map position by one since we need to move by x position
-    dec b ; Decrement our x parameter
-    jr .movexaxis2 ; Repeat
-.start2
-    ld a, [de] ; Load the first byte in the string
-    ld [hl], a ; Write the byte from the accumilator to the destination address
-               ; Also increment destination by one.
-               ; This effectively prints the character byte in accumilator
-    inc de ; Increment to next byte in string
-    inc hl
-    and a ; And together a with itself. This sets the flag
-    jr nz, .start2 ; Go back to start if we didn't just copy a zero.
-    ret
-    
-
diff --git a/main.asm b/main.asm
index cab609e..663700a 100644
--- a/main.asm
+++ b/main.asm
@@ -59,11 +59,26 @@ Start:
 
     ld [rNR52], a ; Turn off sound
 
+    ld a, 7
+    ld [rWX], a
+    ld a, (SCRN_Y - 32)
+    ld [rWY], a
+
+    ; Reset OAM memory with zeros
+    ld hl, _OAMRAM ; Set position of OAM Ram to hl
+    ld a, 0 ; Fill that memory space with zero
+    ld b, $FEA0 - _OAMRAM ; Get the full size of the fill
+    call Memfill
+
+    ; Initialize other stuff
+    call InitWindow
+
     ; Turn the screen on, display background
-    ld a, LCDCF_ON|LCDCF_BGON
-    ; ld a, %10000001 ; screen on = 8th bit, background display = 1st bit
+    ld a, LCDCF_ON|LCDCF_BGON|LCDCF_WINON|LCDCF_WIN9C00
     ld [rLCDC], a ; Set the screen flags
-    ei ; Enable interrupts again?
+
+    call WaitVBlank
+
     jp GameLoop
 
 SECTION "Font", ROM0
diff --git a/main.o b/main.o
index d1a1e9a9b779c7333a23609781e3ce459cdc2b13..ab626f637160f80bd4691b995e93413528682b8c 100644
GIT binary patch
literal 8045
zcmeHLZA@HQ89p$~K!FyvQ_7U$_ENUrElgV$P-lmstqZ$tWi0d~Cc7{TciTyaxszdl
zsijI4lO~cZiH&U{yArLoF&pa|VocoBG42|uu=>Ziu8A3w#!#|}Y|^+D3D@U6=YGtc
z3;4%>a!$^j^PcDZe$P4g!kLz1^_7gVO&F);-q*vC2xAFFiS*Tk`g&OzmYo<IFcNYy
zF&Gag<alRye>@^5Fk|dus8_Bfi1RzZM=ck_%HJbLLRYfcU7T5%$Y2k3C&B}AHgmql
zOhOsVF{Lk=&6=mNk~>ybn+p^jH4@2SMTA6UE2g;gb|M}cZ04SJQ225(Y-9fjyd*M*
zk;UGt49Lk)GTfJKVpNm4xw6cam1M4IGT*ez^uWuNYefdgxp9n)$a_PvY?lhbk%K`k
zD~#?-a`)vg%7c+`)K;(`f}ITfbOkXbng~bxZ6d$cL_SzSge;wrV{$0b7VWl4{z8*{
z-!9pg2*neWhm|U-XmY3>Yn3Ar<-8J)^t31RtxfxzZ|zbr==-XjG*Z>GGj&?i){I|k
zrm{IZHO^P?dp;CSoI4f?MK7Zg#@X8s#EC&ivjtw9Qj}OtZzvp%V4|rryej|`?RGjG
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literal 7649
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f>!0WGTYGhn+pEA{1@<biSAo3>>{a0Zr2_v2%Y3m;

diff --git a/test.gb b/test.gb
index 4fc280d90431381ae98a93b9fa836afae172875b..5725dee413e1e8583071b9d92f212796b75b7b2b 100644
GIT binary patch
literal 32768
zcmeI0e`r%z6vt0~_eW~ernND4_NDblTQ!ZgOS>(;zNuiD8)maQ*&nmAsfCFth&Im1
z0_z_R3ib~{g@XN~P#FW+=s!b|Hyopt)W7Gj@CLHg;#h?;vo7@R+<Wu-(z&|724kLg
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zd>?%~<R6ai5A_U34~9++M-PRR;b?bA<3sCk^gw7o4wEX(+VxqNuG(hZ`m95rb?PC|
zKdwL5zj<=Ot&iR9^)I;e7)C6XbezR#7uOFqypI(Yocg{6hrZ|RSYzq=@03L99vm+V
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p2oM1xKm>>Y5g-CYfCvx)B0vO)01+SpM1Tko0U|&Ih`|4qz@Ipo+MECY

literal 32768
zcmeH|Uu;uV9LIm{+O@E5>*&VHm~zMXGsa*Sn5<&yE`Ji5prMIV7aw3oggq>D(ZGsa
z;*5KkNgw*Khw|heW=0GN(d@;rkefivMmnCwKyn|5E(^vQ7pdh2y}x@nv=t$~>BIM%
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zy-GYdj@#n<Df!dW0|O#XrxOW9NhJ7tlfLA`v1R%Fsw(bBRR;!gj)sP~o~n+F<nyW{
zzQ0r|mkWngb#TxyM4V0s0+C1{kWTY?BawlDY}T^Ej<~jAE0qcaayj;Sy<rpz+=64v
z3fSUgZXtYjq%YodU9NWy;0%MdO8Ze1BK|oToq^x!skl1l^9~~s{vxGS{^jso!jW`|
z`W=<xw;Vki%R17Rb!05-G&v%Y^Ik`#*yTvZA&Q08d-jL+v__k^txY!0Q*{1&Wp+NN
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z*9MKeX&U8zviafB7y19RzVd!AbXDH(t)6oKLf1uixqqwYy4L3#4R3CVt?LV}3G8l-
zk!AiKo*vM%mOrkZwD~;WA69jn=ZURy{ceYE@qTIjVSD|<qsd^4cU5)0yT%jn)stzM
zHUZ84)6&MKG?S8{4Yb<vTWV{(z6xKlbCaQ867O!__RM;dg65QF&_%br-%wzSz5nZ4
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z009sH0T2KI5C8!X009sH0T2KI5C8!X009sH0T2KI5C8!X009sH0T2KI5C8!X009sH
z0T2KI5C8!X009sH0T2KI5C8!X009sH0T2KI5C8!X009sH0T2KI5C8!X009sH0T2KI
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diff --git a/test.map b/test.map
index 26c0b98..1956e39 100644
--- a/test.map
+++ b/test.map
@@ -1,39 +1,40 @@
 ROM Bank #0 (HOME):
   SECTION: $0200-$027F ($0080 bytes) ["ram_textmap"]
            $0200 = textwriter_map
-  SECTION: $0150-$01F5 ($00A6 bytes) ["TextWriter"]
-           $01D0 = DrawActiveText.exit
-           $01A2 = DrawActiveText.movexaxis
-           $0193 = DrawActiveText.moveyaxis
-           $01AA = DrawActiveText.drawletter
-           $01BA = DrawActiveText.continue
-           $01E6 = PrintString.movexaxis2
-           $01D7 = PrintString.moveyaxis2
-           $01EE = PrintString.start2
-           $0150 = StartText
-           $016C = DrawActiveText
-  SECTION: $0061-$0074 ($0014 bytes) ["Game Loop"]
-           $0061 = GameLoop.wait
-           $006D = GameLoop.mainloop
-           $0061 = GameLoop
-  SECTION: $0075-$0085 ($0011 bytes) ["Hello wrold string"]
-           $0075 = HelloWorldStr
-  SECTION: $0031-$003C ($000C bytes) ["Tools"]
-           $003A = WaitVBlank
-           $0031 = Memcpy
+  SECTION: $1280-$136B ($00EC bytes) ["TextWriter"]
+           $1368 = DrawActiveText.exit
+           $1314 = DrawActiveText.movexaxis
+           $1305 = DrawActiveText.moveyaxis
+           $131C = DrawActiveText.drawletter
+           $1330 = DrawActiveText.checkNewline
+           $134E = DrawActiveText.continue
+           $1345 = DrawActiveText.checkRepeatOnce
+           $12F4 = DrawActiveText.startdrawtext
+           $12C1 = StartText
+           $12DD = DrawActiveText
+           $1280 = InitWindow
+  SECTION: $0031-$003E ($000E bytes) ["Game Loop"]
+           $0037 = GameLoop.mainloop
+           $0031 = GameLoop
+  SECTION: $0000-$001F ($0020 bytes) ["Hello wrold string"]
+           $0000 = HelloWorldStr
+  SECTION: $0020-$0030 ($0011 bytes) ["Tools"]
+           $0029 = Memfill
+           $002E = WaitVBlank
+           $0020 = Memcpy
+           $0029 = Memfill.repeatFill
   SECTION: $0040-$0040 ($0001 bytes) ["InterruptVblank"]
   SECTION: $0048-$0048 ($0001 bytes) ["InterruptLCDC"]
   SECTION: $0050-$0050 ($0001 bytes) ["InterruptTimer_Overflow"]
   SECTION: $0058-$0058 ($0001 bytes) ["InterruptSerial"]
   SECTION: $0060-$0060 ($0001 bytes) ["Interruptp1thru4"]
   SECTION: $0100-$014F ($0050 bytes) ["Header"]
-  SECTION: $0000-$0030 ($0031 bytes) ["Intro code"]
-           $0000 = Start
-           $0000 = Start.waitVBlank
+  SECTION: $0061-$00A1 ($0041 bytes) ["Intro code"]
+           $0061 = Start
   SECTION: $0280-$127F ($1000 bytes) ["Font"]
            $0280 = Page1
            $1280 = Page1End
-    SLACK: $2E23 bytes
+    SLACK: $2DBF bytes
 
 WRAM Bank #0:
   SECTION: $C000-$C006 ($0007 bytes) ["ram_textwriter"]
diff --git a/test.sym b/test.sym
index 9646501..41425ae 100644
--- a/test.sym
+++ b/test.sym
@@ -1,24 +1,25 @@
 ; File generated by rgblink
 
 00:0200 textwriter_map
-00:01D0 DrawActiveText.exit
-00:01A2 DrawActiveText.movexaxis
-00:0193 DrawActiveText.moveyaxis
-00:01AA DrawActiveText.drawletter
-00:01BA DrawActiveText.continue
-00:01E6 PrintString.movexaxis2
-00:01D7 PrintString.moveyaxis2
-00:01EE PrintString.start2
-00:0150 StartText
-00:016C DrawActiveText
-00:0061 GameLoop.wait
-00:006D GameLoop.mainloop
-00:0061 GameLoop
-00:0075 HelloWorldStr
-00:003A WaitVBlank
-00:0031 Memcpy
-00:0000 Start
-00:0000 Start.waitVBlank
+00:1368 DrawActiveText.exit
+00:1314 DrawActiveText.movexaxis
+00:1305 DrawActiveText.moveyaxis
+00:131C DrawActiveText.drawletter
+00:1330 DrawActiveText.checkNewline
+00:134E DrawActiveText.continue
+00:1345 DrawActiveText.checkRepeatOnce
+00:12F4 DrawActiveText.startdrawtext
+00:12C1 StartText
+00:12DD DrawActiveText
+00:1280 InitWindow
+00:0037 GameLoop.mainloop
+00:0031 GameLoop
+00:0000 HelloWorldStr
+00:0029 Memfill
+00:002E WaitVBlank
+00:0020 Memcpy
+00:0029 Memfill.repeatFill
+00:0061 Start
 00:0280 Page1
 00:1280 Page1End
 00:C002 textwriter_curletter
diff --git a/tools.asm b/tools.asm
index 0a8438b..b0017be 100644
--- a/tools.asm
+++ b/tools.asm
@@ -18,6 +18,22 @@ Memcpy:
     jr nz, Memcpy ; Loop back to Memcpy if not zero
     ret
 
+Memfill:
+; Fill an area in memory at position hl with value a for b amount of times
+; 
+; @param hl - Starting address in memory to fill
+; @param a - The value to fill said address space with
+; @param b - How many bytes we should fill starting from said address space
+; @return a - garbage
+; @return b - PosX on where to draw text
+; @return c - PosY on where to draw text
+; @return hl - Workram position for text pointer
+; @return de - Memory address to source string
+.repeatFill
+    ld [hli], a
+    dec b
+    jr nz, .repeatFill
+    ret
 
 ;;
 ; Waits for the vblank ISR to increment the count of vertical blanks.