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Add the ability to shoot centipede segments.

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This commit is contained in:
Jeremy Rand 2020-10-02 14:50:14 -04:00
parent 74a21db9e0
commit eb418fb1c4
3 changed files with 125 additions and 14 deletions
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6
BuGS.xcodeproj/xcuserdata/jrand.xcuserdatad/xcschemes/xcschememanagement.plist
View File

@ -7,7 +7,7 @@
<key>Binary.xcscheme_^#shared#^_</key>
<dict>
<key>orderHint</key>
<integer>1</integer>
<integer>2</integer>
</dict>
<key>BuGS.xcscheme_^#shared#^_</key>
<dict>
@ -17,12 +17,12 @@
<key>DiskImage.xcscheme_^#shared#^_</key>
<dict>
<key>orderHint</key>
<integer>2</integer>
<integer>3</integer>
</dict>
<key>doNotBuild.xcscheme_^#shared#^_</key>
<dict>
<key>orderHint</key>
<integer>3</integer>
<integer>1</integer>
</dict>
</dict>
</dict>

5
BuGS/game.s
View File

@ -243,6 +243,8 @@ checkKey_loop2 anop
cmp #'c'
beq checkKey_centipede
cmp #'C'
beq checkKey_shootCentipede
lda colourPalette
inc a
@ -273,6 +275,9 @@ checkKey_addSpider anop
checkKey_shootSpider anop
jmp shootSpider
checkKey_shootCentipede anop
jmp shootRandomSegment
checkKey_quit anop
stz shouldQuit

128
BuGS/gameSegments.s
View File

@ -18,9 +18,10 @@ SEGMENT_MAX_NUM equ 12
SEGMENT_MAX_OFFSET equ SEGMENT_MAX_NUM*2-2
SEGMENT_STATE_NONE equ 0
SEGMENT_STATE_HEAD equ 1
SEGMENT_STATE_POISONED_HEAD equ 2
SEGMENT_STATE_BODY equ 3
SEGMENT_STATE_EXPLODING equ 1
SEGMENT_STATE_HEAD equ 2
SEGMENT_STATE_POISONED_HEAD equ 3
SEGMENT_STATE_BODY equ 4
SEGMENT_DIR_LEFT equ 0
SEGMENT_DIR_RIGHT equ 1
@ -59,11 +60,17 @@ drawSegments_nextSegment anop
drawSegments_cont anop
phx
cmp #SEGMENT_STATE_EXPLODING
beq drawSegments_exploding
cmp #SEGMENT_STATE_BODY
bne drawSegments_head
jsl segmentBodyJump
bra drawSegments_handleTiles
drawSegments_exploding anop
jsl segmentExplodingJump
bra drawSegments_handleTiles
drawSegments_head anop
jsl segmentHeadJump
@ -91,7 +98,20 @@ drawSegments_skipSegment anop
drawSegments_done anop
rtl
segmentExplodingJump entry
lda segmentPosOffset,x
tax
ldy segmentFacing,x
lda explosionJumpTable,y
sta segmentExplodingJump_jumpInst+1
lda explosionJumpTable+2,y
sta segmentExplodingJump_jumpInst+3
ldy segmentScreenOffsets,x
segmentExplodingJump_jumpInst anop
jmp >leftHead1
nop
segmentHeadJump entry
lda segmentPixelOffset
@ -236,7 +256,7 @@ updateSegments_nextSegment anop
jmp updateSegments_skipSegment
updateSegments_cont anop
cmp #SEGMENT_STATE_BODY
bne updateSegments_head
bne updateSegments_headOrExploding
lda segmentPosOffset,x
beq updateSegments_bodyWrapPos
@ -258,8 +278,7 @@ updateSegments_bodyMarkTile anop
plx
jmp updateSegments_skipSegment
updateSegments_head anop
; jsl waitForKey
updateSegments_headOrExploding anop
lda segmentPosOffset,x
beq updateSegments_headWrapPos
dec a
@ -292,6 +311,14 @@ updateSegments_headWrapPos anop
lda segmentCurrentTile
sta segmentCurrentTile+SEGMENT_MAX_POSITION_OFFSET
; We could be in exploding state and if so, we want to skip the rest of the
; code for update head segments.
lda segmentStates,x
cmp #SEGMENT_STATE_EXPLODING
bne updateSegments_notExplodingWrap
jsr updateSegmentExplodingWrap
bra updateSegments_skipSegment
updateSegments_notExplodingWrap anop
; Important - Do facing last because we use that to index into the jump
; table for update.
lda segmentFacing
@ -316,7 +343,15 @@ updateSegments_headNoWrap anop
sta segmentTileOffsetsLR,y
lda segmentCurrentTile+2,y
sta segmentCurrentTile,y
; We could be in exploding state and if so, we want to skip the rest of the
; code for update head segments.
lda segmentStates,x
cmp #SEGMENT_STATE_EXPLODING
bne updateSegments_notExplodingNoWrap
jsr updateSegmentExplodingNoWrap
bra updateSegments_skipSegment
updateSegments_notExplodingNoWrap anop
; Important - Do facing last because we use that to index into the jump
; table for update.
lda segmentFacing+2,y
@ -352,8 +387,27 @@ updateSegments_skipSegment anop
jmp updateSegments_nextSegment
updateSegments_done anop
rtl
updateSegmentExplodingNoWrap entry
lda segmentFacing+2,y
bra updateSegmentExploding_common
updateSegmentExplodingWrap entry
lda segmentFacing
updateSegmentExploding_common anop
beq updateSegmentExploding_done
sec
sbc #$4
sta segmentFacing,y
rts
updateSegmentExploding_done anop
lda #SEGMENT_STATE_NONE
sta segmentStates,x
rts
updateSegmentLeftFast entry
tyx
dec segmentScreenOffsets,x
@ -1451,9 +1505,61 @@ addFastHeadSegment entry
rtl
; Call this with the segment num * 2 in the X register
shootSegment entry
; Write this code...
dec numSegments
lda #SEGMENT_STATE_EXPLODING
sta segmentStates,x
ldy segmentPosOffset,x
; We take over the segmentFacing value when exploding to be an explosion sprite offset
lda #EXPLOSION_LAST_OFFSET
sta segmentFacing,y
lda segmentCurrentTile,y
cmp #(NUM_GAME_TILES-GAME_NUM_TILES_WIDE)*SIZEOF_TILE_INFO
bge shootSegment_skipMushroom
tay
lda tileType,y
beq shootSegment_normalMushroom
cmp #TILE_POISON_MUSHROOM1
bge shootSegment_poisonMushroom
shootSegment_normalMushroom anop
lda #TILE_MUSHROOM4
bra shootSegment_dirtyTile
shootSegment_poisonMushroom anop
lda #TILE_POISON_MUSHROOM4
shootSegment_dirtyTile anop
sta tileType,y
lda #TILE_STATE_DIRTY
sta tileDirty,y
shootSegment_skipMushroom anop
; If this is the last segment, then do not look for a following body segment
cpx #22
bge shootSegment_done
; If the segment after this is a body segment, then it is now a head segment
lda segmentStates+2,x
cmp #SEGMENT_STATE_BODY
bne shootSegment_done
lda #SEGMENT_STATE_HEAD
sta segmentStates+2,x
shootSegment_done anop
rtl
shootRandomSegment entry
lda numSegments
bne shootRandomSegment_hasSegments
rtl
shootRandomSegment_hasSegments anop
lda #12
jsl randN
asl a
tax
lda segmentStates,x
cmp #SEGMENT_STATE_HEAD
blt shootRandomSegment_hasSegments
jmp shootSegment
numSegments dc i2'0'