From e7f4a0b25688b352f5eb590d5abaaba7736894eb Mon Sep 17 00:00:00 2001
From: blondie7575 <qd@quinndunki.com>
Date: Sun, 30 Jul 2017 12:16:19 -0700
Subject: [PATCH] Basic sine wave terrain test

---
 gscats.2mg | Bin 819264 -> 819264 bytes
 terrain.s  |  11 ++++++++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/gscats.2mg b/gscats.2mg
index dfd6e7b7d4b08d092ade806be2702b3f8d54c175..74f7b94a5885822ac98644b8e8348dddd1468f17 100644
GIT binary patch
delta 443
zcmX@mV056tXhRmOpc6C0KP7%128P2793TeMWJji>n;qE1>KOSZhqw5!T;WvMzIl0z
z8l%ce&O-)OOVfLob9(Ij#Hsn8VbzOMAB0v43ic<=d6;4Gasfl{^2r}s)uldhwn|3L
z04i9q(}_#7zP@Ur<cR|T3>RJ}Y&L3hWtwQfy}7(&lOd4UYq)tr=MsZag4i&)uL}SI
CAlKdi

delta 171
zcmX@mV056tXhRmOpgA+cKP5A628P2793TeMWJji>n;qE1>KK_Phqw5!T;^2Rwt0Dr
z8l&<G&O-)OOVfLoaeC~0&Z+sIVb!S*LMsIY`xE9o%&>U5fT4HU<d3cD{LeXCC07P8
zOq4uvAb{b*kI55rr8YaXnKNxR*|pcO*<@F{$u349W&&bnAZ7t#Rv=~rVs;?r0Afxc
M=Gtzui<{>d0J20v;Q#;t

diff --git a/terrain.s b/terrain.s
index 06bf777..f9a06f1 100644
--- a/terrain.s
+++ b/terrain.s
@@ -33,6 +33,7 @@ renderTerrainColumn:
 	lda terrainData,y
 	and #$00ff
 	tax
+	inx		; Prevent x from going negative upon entry to loop
 
 renderTerrainColumnLoop:
 	dex
@@ -86,9 +87,17 @@ generateTerrain:
 	ldy #0
 	lda #terrainData
 	sta SCRATCHL
-	lda #MAXTERRAINHEIGHT
 
 generateTerrainLoop:
+
+	phy
+	tya		; Pull an interesting value out of the sine table
+	and #$00ff
+	tay
+	lda sineTable,y
+	and #$7f7f
+	ply
+
 	sta (SCRATCHL),y
 	iny
 	cpy #TERRAINWIDTH/4