mirror of https://github.com/jeremysrand/BuGS.git
301 lines
5.7 KiB
ArmAsm
301 lines
5.7 KiB
ArmAsm
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; game.s
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; BuGS
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;
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; Created by Jeremy Rand on 2020-06-10.
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;Copyright © 2020 Jeremy Rand. All rights reserved.
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;
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;
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; The actual game is a 30x30 grid of 8x8 tiles.
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; The GS can do 30 wide with 10 tiles to spare.
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; The GS can only do 25 tiles tall though. So,
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; the screen will be 30 wide pushed to the right-
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; most side. The left side will have the score,
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; count of lives and the high score. Rather than
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; having them at the top, running that info on
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; the side will give us more vertical height for
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; more on-screen action.
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case on
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mcopy game.macros
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keep game
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game start
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using globalData
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using tileData
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jsl setupScreen
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lda #0
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jsl setColour
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gameLoop anop
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_drawDirtyGameRow 0
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_drawDirtyGameRow 1
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_drawDirtyGameRow 2
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_drawDirtyGameRow 3
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_drawDirtyGameRow 4
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_drawDirtyGameRow 5
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_drawDirtyGameRow 6
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_drawDirtyGameRow 7
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_drawDirtyGameRow 8
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_drawDirtyGameRow 9
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_drawDirtyGameRow 10
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_drawDirtyGameRow 11
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_drawDirtyGameRow 12
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_drawDirtyGameRow 13
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_drawDirtyGameRow 14
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jsl drawScorpion
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_drawDirtyGameRow 15
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_drawDirtyGameRow 16
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_drawDirtyGameRow 17
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_drawDirtyGameRow 18
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_drawDirtyGameRow 19
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_drawDirtyGameRow 20
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_drawDirtyGameRow 21
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_drawDirtyGameRow 22
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_drawDirtyGameRow 23
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_drawDirtyGameRow 24
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jsl drawSpider
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jsl drawFlea
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jsl drawSegments
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jsl drawDirtyNonGameTiles
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jsl updatePlayer
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jsl updateShot
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jsl updateScorpion
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jsl updateSpider
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jsl updateFlea
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jsl updateSegments
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jsl updateLevel
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jsl checkKeyboard
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jsl waitForVbl
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lda shouldQuit
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beq gameDone
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jmp gameLoop
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gameDone anop
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short i,m
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lda >BORDER_COLOUR_REGISTER
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and #$f0
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ora borderColour
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sta >BORDER_COLOUR_REGISTER
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long i,m
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rtl
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drawDirtyNonGameTiles entry
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ldy numDirtyNonGameTiles
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beq dirtyTileLoopDone2
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dirtyTileLoop2 anop
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dey
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dey
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phy
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ldx dirtyNonGameTiles,y
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stz tileDirty,x
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ldy tileScreenOffset,x
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lda tileType,x
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jsl drawTile
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ply
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bne dirtyTileLoop2
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dirtyTileLoopDone2 anop
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stz numDirtyNonGameTiles
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rtl
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drawTile entry
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tax
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lda tileJumpTable,x
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sta jumpInst+1
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lda tileJumpTable+2,x
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sta jumpInst+3
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jumpInst jmp >mushroom1
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nop
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setupScreen entry
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short i,m
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lda >SHADOW_REGISTER ; Enable shadowing of SHR
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and #$f7
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sta >SHADOW_REGISTER
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lda #$a1
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sta >NEW_VIDEO_REGISTER ; Enable SHR mode
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lda >BORDER_COLOUR_REGISTER
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long i,m
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and #$000f
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sta borderColour
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short i,m
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lda >BORDER_COLOUR_REGISTER
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and #$f0
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sta >BORDER_COLOUR_REGISTER
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long i,m
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sei
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phd
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tsc
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sta >backupStack
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lda >STATE_REGISTER ; Direct Page and Stack in Bank 01/
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ora #$0030
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sta >STATE_REGISTER
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ldx #$0000
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lda #$9dfe
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tcs
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ldy #$7e00
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nextWord anop
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phx
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dey
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dey
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bpl nextWord
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lda >STATE_REGISTER
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and #$ffcf
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sta >STATE_REGISTER
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lda >backupStack
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tcs
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pld
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cli
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rtl
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; The accumulator has a 0 in it when starting a one player game, 1 when
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; starting a two player game.
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startGame entry
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ldx gameRunning
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bne startGame_notRunning
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rtl
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startGame_notRunning anop
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stz gameRunning
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jsl addRandomMushrooms
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jsl scoreStartGame
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jsl initPlayer
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jsl spiderInitGame
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jsl levelInit
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; Fall through intentionally here...
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startLevel entry
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jsl segmentsInitLevel
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jsl scorpionInitLevel
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jsl spiderInitLevel
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jsl fleaInitLevel
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jsl shotInitLevel
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jsl playerLevelStart
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jmp levelStart
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pauseGame entry
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; TODO - Write this code...
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rtl
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gameOver entry
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lda #1
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sta gameRunning
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jsl segmentsInitLevel
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jsl scorpionInitLevel
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jsl spiderInitLevel
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jsl fleaInitLevel
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ldx #0
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gameOver_loop anop
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lda tileType,x
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beq gameOver_tileEmpty
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stz tileType,x
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lda #TILE_STATE_DIRTY
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sta tileDirty,x
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gameOver_tileEmpty anop
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inx
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inx
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cpx #RHS_FIRST_TILE_OFFSET
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blt gameOver_loop
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jmp checkHighScore
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checkKeyboard entry
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checkKey_loop2 anop
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short i,m
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lda >KEYBOARD
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bpl checkKey_done
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sta >KEYBOARD_STROBE
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long i,m
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and #$007f
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cmp #'q'
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beq checkKey_quit
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cmp #'Q'
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beq checkKey_quit
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cmp #'p'
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beq checkKey_pause
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cmp #'P'
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beq checkKey_pause
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cmp #$001b
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beq checkKey_pause
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cmp #'1'
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beq checkKey_game
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cmp #'2'
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beq checkKey_game
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checkKey_done anop
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long i,m
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rtl
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checkKey_pause anop
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jmp pauseGame
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checkKey_quit anop
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stz shouldQuit
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rtl
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checkKey_game anop
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sec
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sbc #'1'
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jmp startGame
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waitForKey entry
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short i,m
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waitForKey_loop anop
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lda >KEYBOARD
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bpl waitForKey_loop
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sta >KEYBOARD_STROBE
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long i,m
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rtl
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waitForVbl entry
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vblLoop anop
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lda >VERTICAL_COUNTER ; load the counter value
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and #$80ff ; mask out the VBL bits
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asl a ; shift the word around
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adc #0 ; move MSB -> LSB
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cmp #$1c8
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bge vblLoop
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rtl
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shouldQuit dc i2'1'
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borderColour dc i2'0'
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end
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