From eb7757a8b3687395189692cdd509dd8d71ff444f Mon Sep 17 00:00:00 2001
From: Colin McMillen <c@16bit.cc>
Date: Sun, 31 May 2015 15:05:37 -0400
Subject: [PATCH] Change shot sprite to be up against left edge.

Also fix a bug where some entries of the sprite buffer weren't being
cleared.
---
 pewpew.asm    |  17 ++++++++++++++---
 sprites32.pcx | Bin 2205 -> 2205 bytes
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/pewpew.asm b/pewpew.asm
index 9f9b8f4..c32e98b 100644
--- a/pewpew.asm
+++ b/pewpew.asm
@@ -464,13 +464,14 @@ MaybeShoot:
     beq MaybeShootDone
     jmp -
 +
-    ; Enable shot; set its position to player position.
+    ; Enable shot; set its position based on player position.
     ; TODO(mcmillen): it might be easier/faster to keep N arrays: one for each
     ; field of shot (shotSpriteArray, shotXArray, shotYArray, ...)
     lda #8  ; Sprite number.
     sta 0, X
 
     lda playerX
+    adc #20
     sta 1, X
 
     lda playerY
@@ -484,12 +485,12 @@ MaybeShoot:
     lda nextShotState
     cmp #1
     beq +
-    lda #3
+    lda #2
     sta 4, X
     inc nextShotState
     jmp ++
 +
-    lda #-3
+    lda #-2
     sta 4, X
     dec nextShotState
 ++
@@ -660,6 +661,16 @@ UpdateSprites:
     cpy #(shotArrayLength * shotSize)
     bne -
 
+    ; Now clear out the unused entries in the sprite table.
+-
+    cpx #spriteTable1Size
+    beq +
+    lda #1
+    sta spriteTableStart, X
+    .rept 4
+        inx
+    .endr
++
     rts
 
 
diff --git a/sprites32.pcx b/sprites32.pcx
index 31e3af64569e10141e186f430325b315bd40ee76..9eea6970bb72d90ae178da43270f9cdc501f8a39 100644
GIT binary patch
delta 100
zcmbO$I9G7O3)b@thuH2;W@J@lKh3~)h>Pvc<clnt?5CjY)hvpvr$H(<XEP=;LzpNE
XkTgy_FUbxzjp4+^g`%6|SnZhs{t+W3

delta 100
zcmbO$I9G7O3)V*rhuBU{W@J@lzsJCKh>Pvy<clnt?02E;)hvpv_dqH(XEP=;LzpNE
XkTgy_FUbxzjp4+^g`%6|SnZhs0T?4C