mirror of https://github.com/jeremysrand/BuGS.git
Add the code to support switching between fast and slow spiders.
This commit is contained in:
Jeremy Rand
parent
883d882d0e
commit
8bcd4fccf6
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@ -725,12 +725,16 @@ checkKey_fast anop
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lda #SPRITE_SPEED_FAST
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jsl setFleaSpeed
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lda #SPRITE_SPEED_FAST
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jsl setSpiderSpeed
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lda #SPRITE_SPEED_FAST
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jmp setScorpionSpeed
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checkKey_slow anop
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lda #SPRITE_SPEED_SLOW
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jsl setFleaSpeed
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lda #SPRITE_SPEED_SLOW
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jsl setSpiderSpeed
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lda #SPRITE_SPEED_SLOW
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jmp setScorpionSpeed
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checkKey_quit anop
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@ -35,9 +35,10 @@ SPIDER_RHS_TILE_OFFSET equ SPIDER_TOP_ROW_OFFSET+(GAME_NUM_TILES_WIDE-1)*SI
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; The spider starts 2 pixel rows above the top row offset so it can slide in on the edge of
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; the screen on a diagonal and hit the centre of the tiles with the middle of its body.
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SPIDER_STARTING_SHIFT equ 2
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SPIDER_LHS_STARTING_SCREEN_OFFSET equ SCREEN_BYTES_PER_ROW*SPIDER_STARTING_SHIFT+6
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SPIDER_RHS_STARTING_SCREEN_OFFSET equ SCREEN_BYTES_PER_ROW*SPIDER_STARTING_SHIFT+4
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SPIDER_STARTING_SHIFT_SLOW equ 2
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SPIDER_STARTING_SHIFT_FAST equ 1
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SPIDER_LHS_STARTING_SCREEN_OFFSET equ SCREEN_BYTES_PER_ROW*SPIDER_STARTING_SHIFT_SLOW+6
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SPIDER_RHS_STARTING_SCREEN_OFFSET equ SCREEN_BYTES_PER_ROW*SPIDER_STARTING_SHIFT_SLOW+4
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; Every four frames, change the spider sprite
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SPIDER_SPRITE_REFRESH_COUNT equ 4
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@ -48,6 +49,17 @@ SPIDER_SCORE_300 equ 0
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SPIDER_SCORE_600 equ 4
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SPIDER_SCORE_900 equ 8
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SPIDER_VERT_SPEED_SLOW equ SCREEN_BYTES_PER_ROW
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SPIDER_VERT_SPEED_FAST equ SCREEN_BYTES_PER_ROW*2
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SPIDER_MAX_SHIFT_IN_TILE_SLOW equ TILE_PIXEL_HEIGHT
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SPIDER_MAX_SHIFT_IN_TILE_FAST equ TILE_PIXEL_HEIGHT/2
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SPIDER_LEFT_SCREEN_SHIFT_SLOW equ 1
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SPIDER_LEFT_SCREEN_SHIFT_FAST equ 0
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SPIDER_RIGHT_SCREEN_SHIFT_SLOW equ 0
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SPIDER_RIGHT_SCREEN_SHIFT_FAST equ 1
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drawSpider entry
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lda spiderState
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@ -316,7 +328,7 @@ updateSpider_leftDown anop
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updateSpider_rightDown anop
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lda spiderScreenOffset
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clc
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adc #SCREEN_BYTES_PER_ROW
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adc spiderVertSpeed
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sta spiderScreenOffset
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lda spiderShiftInTile
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@ -329,7 +341,7 @@ updateSpider_leftUp anop
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updateSpider_rightUp anop
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lda spiderScreenOffset
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sec
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sbc #SCREEN_BYTES_PER_ROW
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sbc spiderVertSpeed
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sta spiderScreenOffset
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lda spiderShiftInTile
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@ -341,12 +353,14 @@ updateSpider_rightUp anop
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updateSpider_rightDiagDown anop
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lda spiderScreenOffset
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clc
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adc #SCREEN_BYTES_PER_ROW
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adc spiderVertSpeed
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sta spiderScreenOffset
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lda spiderScreenShift
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updateSpider_rightDiagDown_eor anop
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eor #1
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sta spiderScreenShift
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cmp spiderRightStartingScreenShift
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bne updateSpider_rightDiagDown_skipInc
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inc spiderScreenOffset
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@ -358,20 +372,22 @@ updateSpider_rightDiagDown_skipInc anop
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jmp updateSpider_tilesDown
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updateSpider_rightDiagDown_cont anop
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cmp #SPIDER_STARTING_SHIFT
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cmp spiderStartingShift
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bne updateSpider_done
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jmp updateSpider_tilesRight
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updateSpider_leftDiagDown anop
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lda spiderScreenOffset
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clc
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adc #SCREEN_BYTES_PER_ROW
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adc spiderVertSpeed
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sta spiderScreenOffset
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lda spiderScreenShift
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updateSpider_leftDiagDown_eor anop
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eor #1
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sta spiderScreenShift
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beq updateSpider_leftDiagDown_skipInc
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cmp spiderLeftStartingScreenShift
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bne updateSpider_leftDiagDown_skipInc
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dec spiderScreenOffset
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updateSpider_leftDiagDown_skipInc anop
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@ -382,7 +398,7 @@ updateSpider_leftDiagDown_skipInc anop
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jmp updateSpider_tilesDown
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updateSpider_leftDiagDown_cont anop
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cmp #SPIDER_STARTING_SHIFT
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cmp spiderStartingShift
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bne updateSpider_done
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jmp updateSpider_tilesLeft
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@ -392,13 +408,15 @@ updateSpider_done anop
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updateSpider_leftDiagUp anop
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lda spiderScreenOffset
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sec
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sbc #SCREEN_BYTES_PER_ROW
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sbc spiderVertSpeed
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sta spiderScreenOffset
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lda spiderScreenShift
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updateSpider_leftDiagUp_eor anop
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eor #1
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sta spiderScreenShift
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beq updateSpider_lefttDiagUp_skipInc
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cmp spiderLeftStartingScreenShift
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bne updateSpider_lefttDiagUp_skipInc
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dec spiderScreenOffset
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updateSpider_lefttDiagUp_skipInc anop
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@ -409,7 +427,7 @@ updateSpider_lefttDiagUp_skipInc anop
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jmp updateSpider_tilesUp
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updateSpider_lefttDiagUp_cont anop
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cmp #SPIDER_STARTING_SHIFT
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cmp spiderStartingShift
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bne updateSpider_done
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jmp updateSpider_tilesLeft
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rtl
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@ -417,12 +435,14 @@ updateSpider_lefttDiagUp_cont anop
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updateSpider_rightDiagUp anop
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lda spiderScreenOffset
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sec
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sbc #SCREEN_BYTES_PER_ROW
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sbc spiderVertSpeed
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sta spiderScreenOffset
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lda spiderScreenShift
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updateSpider_rightDiagUp_eor anop
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eor #1
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sta spiderScreenShift
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cmp spiderRightStartingScreenShift
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bne updateSpider_rightDiagUp_skipInc
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inc spiderScreenOffset
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@ -434,7 +454,7 @@ updateSpider_rightDiagUp_skipInc anop
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jmp updateSpider_tilesUp
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updateSpider_rightDiagUp_cont anop
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cmp #SPIDER_STARTING_SHIFT
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cmp spiderStartingShift
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bne updateSpider_done
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jmp updateSpider_tilesRight
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rtl
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@ -487,7 +507,7 @@ updateSpider_tilesLeft_cont anop
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rtl
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updateSpider_tilesUp anop
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lda #TILE_PIXEL_HEIGHT
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lda spiderMaxShiftInTile
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sta spiderShiftInTile
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lda spiderCurrentRow
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@ -558,7 +578,7 @@ updateSpider_upChangeDirDiagRight anop
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rtl
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updateSpider_tilesDown anop
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lda #TILE_PIXEL_HEIGHT
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lda spiderMaxShiftInTile
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sta spiderShiftInTile
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lda spiderCurrentRow
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@ -640,8 +660,7 @@ addSpider entry
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rtl
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addSpider_doit anop
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lda #SPIDER_STARTING_SHIFT
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lda spiderStartingShift
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sta spiderShiftInTile
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lda #SPIDER_SPRITE_LAST_OFFSET
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@ -666,7 +685,7 @@ addSpider_left anop
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lda #SPIDER_STATE_LEFT_DIAG_DOWN
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sta spiderState
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lda #1
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lda spiderLeftStartingScreenShift
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sta spiderScreenShift
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ldx #SPIDER_RHS_TILE_OFFSET
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@ -700,7 +719,8 @@ addSpider_right anop
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lda #SPIDER_STATE_RIGHT_DIAG_DOWN
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sta spiderState
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stz spiderScreenShift
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lda spiderRightStartingScreenShift
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sta spiderScreenShift
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ldx #SPIDER_LHS_TILE_OFFSET
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stx spiderTileOffsets
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@ -730,6 +750,68 @@ addSpider_right anop
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rtl
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setSpiderSpeed entry
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cmp #SPRITE_SPEED_FAST
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beq setSpiderSpeed_fast
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lda #SPIDER_VERT_SPEED_SLOW
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sta spiderVertSpeed
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lda #SPIDER_MAX_SHIFT_IN_TILE_SLOW
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sta spiderMaxShiftInTile
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lda #SPIDER_STARTING_SHIFT_SLOW
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sta spiderStartingShift
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lda #SPIDER_LEFT_SCREEN_SHIFT_SLOW
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sta spiderLeftStartingScreenShift
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lda #SPIDER_RIGHT_SCREEN_SHIFT_SLOW
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sta spiderRightStartingScreenShift
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; This is funky. This sets the instruction at these location to be an immediate eor
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; instruction. That causes us to only move to the next byte every other frame.
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short i,m
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lda #$49
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sta updateSpider_rightDiagDown_eor
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sta updateSpider_rightDiagUp_eor
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sta updateSpider_leftDiagDown_eor
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sta updateSpider_leftDiagUp_eor
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long i,m
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rtl
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setSpiderSpeed_fast anop
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lda #SPIDER_VERT_SPEED_FAST
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sta spiderVertSpeed
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lda #SPIDER_MAX_SHIFT_IN_TILE_FAST
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sta spiderMaxShiftInTile
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lda #SPIDER_STARTING_SHIFT_FAST
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sta spiderStartingShift
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lda #SPIDER_LEFT_SCREEN_SHIFT_FAST
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sta spiderLeftStartingScreenShift
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lda #SPIDER_RIGHT_SCREEN_SHIFT_FAST
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sta spiderRightStartingScreenShift
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; This is funky. This sets the instruction at these location to be an immediate or
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; instruction for the right and and immediate and instruction for the left. That causes
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; us to only move to the next byte on every frame.
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short i,m
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lda #$09
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sta updateSpider_rightDiagDown_eor
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sta updateSpider_rightDiagUp_eor
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lda #$29
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sta updateSpider_leftDiagDown_eor
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sta updateSpider_leftDiagUp_eor
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long i,m
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rtl
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shootSpider entry
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lda spiderState
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cmp #SPIDER_STATE_LEFT_DIAG_DOWN
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@ -767,6 +849,12 @@ spiderTargetRow dc i2'0'
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spiderScoreType dc i2'0'
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spiderScoreFrames dc i2'0'
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spiderVertSpeed dc i2'SPIDER_VERT_SPEED_SLOW'
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spiderMaxShiftInTile dc i2'SPIDER_MAX_SHIFT_IN_TILE_SLOW'
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spiderStartingShift dc i2'SPIDER_STARTING_SHIFT_SLOW'
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spiderLeftStartingScreenShift dc i2'SPIDER_LEFT_SCREEN_SHIFT_SLOW'
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spiderRightStartingScreenShift dc i2'SPIDER_RIGHT_SCREEN_SHIFT_SLOW'
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; 10 6 2
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; 8 4 0
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