From 17cc990e5a10142217c34c38dd2da47f87a8c609 Mon Sep 17 00:00:00 2001
From: Vince Weaver <vince@deater.net>
Date: Fri, 18 Jan 2019 00:27:32 -0500
Subject: [PATCH] ootw: add falling boulder

---
 ootw/ootw.s           |  3 +++
 ootw/ootw_cavern.s    | 31 +++++++++++++++++++++++++++++++
 ootw/ootw_sprites.inc |  7 +++++++
 ootw/zp.inc           |  2 ++
 4 files changed, 43 insertions(+)

diff --git a/ootw/ootw.s b/ootw/ootw.s
index 01de826c..1be8f57f 100644
--- a/ootw/ootw.s
+++ b/ootw/ootw.s
@@ -23,6 +23,9 @@ ootw:
 	lda     #1
 	sta     DIRECTION
 
+	lda	#40
+	sta	BOULDER_Y
+
 	jsr	ootw_pool
 
 ;===========================
diff --git a/ootw/ootw_cavern.s b/ootw/ootw_cavern.s
index 00f9a4d4..77073e88 100644
--- a/ootw/ootw_cavern.s
+++ b/ootw/ootw_cavern.s
@@ -94,6 +94,16 @@ earthquake_init:
 	lda	#200
 	sta	EQUAKE_PROGRESS
 
+	lda	#0
+	sta	BOULDER_Y
+	jsr	random16
+	lda	SEEDL
+	and	#$1f
+	clc
+	adc	#4
+	sta	BOULDER_X
+
+
 earth_mover:
 	lda	EQUAKE_PROGRESS
 	beq	earth_still
@@ -144,7 +154,28 @@ done_shake:
 	;======================
 	; draw falling boulders
 
+	lda	BOULDER_Y
+	cmp	#38
+	bpl	no_boulder
 
+	lda	#<boulder
+	sta	INL
+	lda	#>boulder
+	sta	INH
+
+	lda	BOULDER_X
+	sta	XPOS
+	lda	BOULDER_Y
+	sta	YPOS
+        jsr	put_sprite
+
+	lda	FRAMEL
+	and	#$3
+	bne	no_boulder
+	inc	BOULDER_Y
+	inc	BOULDER_Y
+
+no_boulder:
 	;=======================
 	; page flip
 
diff --git a/ootw/ootw_sprites.inc b/ootw/ootw_sprites.inc
index 4b9bebc7..e7138249 100644
--- a/ootw/ootw_sprites.inc
+++ b/ootw/ootw_sprites.inc
@@ -361,6 +361,13 @@ caught8:
 	.byte	$aa,$aa,$aa,$aa
 	.byte	$aa,$aa,$aa,$5e
 
+	;============================
+	; Falling boulder
+
+boulder:
+	.byte	$3,$2
+	.byte	$22,$22,$2a
+	.byte	$22,$22,$22
 
 
 
diff --git a/ootw/zp.inc b/ootw/zp.inc
index 4971671e..559ec245 100644
--- a/ootw/zp.inc
+++ b/ootw/zp.inc
@@ -138,6 +138,8 @@ HGR_COLOR       = $E4
 GAME_OVER	= $E5
 EQUAKE_PROGRESS = $E6
 EARTH_OFFSET	= $E7
+BOULDER_X	= $E8
+BOULDER_Y	= $E9
 			;SHIPY		=	$E4
 			;YADD		=	$E5
 			;LOOP		=	$E6