400 lines
7.2 KiB
ArmAsm
400 lines
7.2 KiB
ArmAsm
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; gamemanager
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; The manager for overall game logic
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;
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; Created by Quinn Dunki on 8/15/17
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;
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NUMPLAYERS = 2
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beginGameplay:
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; Set up palette for terrain and players
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lda #basePalette
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sta PARAML0
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lda #0
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jsr setPalette
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; Set up palette for status bar
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lda #statusBarPalette
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sta PARAML0
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lda #1
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jsr setPalette
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lda #1
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sta PARAML0
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ldx #0
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ldy #10
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jsr setScanlinePalette
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; Set up sprite rendering
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BITS8
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lda #3
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sta SpriteBankBank00+3 ; Tell compiled sprites what bank they are in
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BITS16
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; Erase the screen
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ldx #$0000
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ldy #200
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jsr colorFill
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; Generate, compile, and clip terrain
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stz leftScreenEdge
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jsr generateTerrain
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; Create players
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lda #56
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ldy #0
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jsr playerCreate
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lda #568
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ldy #1
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jsr playerCreate
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ldy #0
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jsr renderPlayerHeader
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jsr protectPlayers
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jsr protectProjectiles
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jsr prepareRowRendering
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jsr compileTerrain
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jsr clipTerrain
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; jsl renderTerrainSpans ; Part of the now disabled fill-mode renderer
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gameplayLoop:
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jsr kbdScan
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; BORDER_COLOR #$F
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jsr nextVBL
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; BORDER_COLOR #$0
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; Check for pause
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lda paused
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bne gameplayLoopEndFrame
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;;;;;;;;;;;
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; Update
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;
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lda #1
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sta projectilesDirty
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lda projectileActive
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bpl gameplayLoopShotTracking ; Skip input during shots
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bra gameplayLoopScroll
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gameplayLoopShotTracking:
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jsr trackActiveShot
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; BORDER_COLOR #$1
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gameplayLoopScroll:
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; Scroll map if needed
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lda mapScrollRequested
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bmi gameplayLoopAngle
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jsr scrollMap
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gameplayLoopAngle:
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; Update aim angle if needed
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lda angleDeltaRequested
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beq gameplayLoopPower
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jsr changeAngle
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gameplayLoopPower:
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; Update power if needed
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lda powerDeltaRequested
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beq gameplayLoopFire
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jsr changePower
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gameplayLoopFire:
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lda fireRequested
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beq gameplayLoopRender
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jsr fire
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; BORDER_COLOR #$2
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gameplayLoopRender:
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; sta KBDSTROBE
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;;;;;;;;;;;
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; Render
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;
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; Render the terrain if needed
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lda terrainDirty
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beq gameplayLoopProjectiles
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; jsl renderTerrainSpans ; Part of the now disabled fill-mode renderer
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jsr renderTerrain
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stz terrainDirty
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; Render players
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jsr renderPlayers
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gameplayLoopProjectiles:
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; BORDER_COLOR #$3
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lda projectilesDirty
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beq gameplayLoopProjectilesSkip
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jsr unrenderProjectiles
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jsr updateProjectilesPhysics
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jsr protectProjectiles
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jsr renderProjectiles
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gameplayLoopProjectilesSkip:
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jsr updateProjectilesCollisions
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lda inventoryDirty
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beq gameplayLoopVictoryCondition
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stz inventoryDirty
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jsr renderInventory
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; BORDER_COLOR #$4
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gameplayLoopVictoryCondition:
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lda gameOver
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bmi gameplayEndTurnCondition
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jsr endGame
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gameplayEndTurnCondition:
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lda turnRequested
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beq gameplayLoopEndFrame
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jsr endTurn
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gameplayLoopEndFrame:
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lda quitRequested
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beq gameplayLoopContinue
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jmp quitGame
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gameplayLoopContinue:
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jmp gameplayLoop
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; trackActiveShot
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;
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; Handles tracking the projectile with the camera
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;
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; Trashes SCRATCHL
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;
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trackActiveShot:
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ldy projectileActive
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lda projectileData+JD_PRECISEX,y
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lsr ; Convert to integer and divide by two for byte distance
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lsr
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lsr
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lsr
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lsr
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sta SCRATCHL ; Save this for later
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lda projectileData+JD_VX,y
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bmi trackActiveShotNeg
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; Left-to-right
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lda mapScrollPos
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cmp #VISIBLETERRAINWIDTH-VISIBLETERRAINWINDOW
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beq trackActiveShotDone ; Logical-right edge clamp
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lda SCRATCHL
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sec
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sbc #150 ; Check for moving close to right edge
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cmp leftScreenEdge
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bmi trackActiveShotDone
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lda #80 ; Move screen right to see shot land
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sta mapScrollRequested
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trackActiveShotNeg:
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; Right-to-left
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lda mapScrollPos
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beq trackActiveShotDone ; Logical-left edge clamp
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lda SCRATCHL
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clc
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adc #150 ; Check for moving close to left edge
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cmp rightScreenEdge
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bpl trackActiveShotDone
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stz mapScrollRequested ; Move screen left to see shot land
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trackActiveShotDone:
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; endTurn
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;
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; Handles changing the active player
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;
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endTurn:
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lda currentPlayer
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inc
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cmp #NUMPLAYERS
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beq endTurnWrap
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sta currentPlayer
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endTurnRefresh:
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ldy currentPlayer
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beq endTurnFocusPlayer0
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lda #VISIBLETERRAINWINDOW
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sta mapScrollRequested
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endTurnHeader:
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jsr renderPlayerHeader
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jsr renderInventory
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stz turnRequested
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rts
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endTurnFocusPlayer0:
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stz mapScrollRequested
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bra endTurnHeader
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endTurnWrap:
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stz currentPlayer
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bra endTurnRefresh
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; endGame
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;
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; Handles someone winning
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;
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endGame:
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lda #1
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sta quitRequested
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; scrollMap
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;
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; Handles updating the state of the terrain in response to scrolling
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;
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; A = New map scroll position
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;
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scrollMap:
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jsr unclipTerrain
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; jsl unrenderTerrainSpans ; Part of the now disabled fill-mode renderer
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jsr unrenderPlayers
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jsr unrenderProjectiles
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; jsr updateProjectilePhysics ; Good idea?
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sta mapScrollPos
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asl
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sta leftScreenEdge
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clc
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adc #160-GAMEOBJECTWIDTH/4-1
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sta rightScreenEdge
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jsr clipTerrain
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lda #$ffff
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sta mapScrollRequested
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jsr protectPlayers
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jsr protectProjectiles
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jsr renderPlayers
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jsr renderProjectiles ; Prevents flicker, but ads jitter to shot tracking
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lda #1
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sta terrainDirty
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stz projectilesDirty
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; changeAngle
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;
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; Handles changing a player's aim
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;
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changeAngle:
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ldy currentPlayer
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tax
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jsr playerDeltaAngle
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ldy currentPlayer
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jsr renderPlayerHeader
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stz angleDeltaRequested
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; changePower
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;
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; Handles changing a player's power
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;
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changePower:
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ldy currentPlayer
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tax
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jsr playerDeltaPower
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ldy currentPlayer
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jsr renderPlayerHeader
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stz powerDeltaRequested
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; fire
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;
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; Handles firing a player's weapon
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;
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fire:
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stz fireRequested
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ldy currentPlayer
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jsr playerFire
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rts
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basePalette:
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; Color 0 and 1 must both be sky blue. Compiled rendering uses PHD (which must contain $0000),
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; and span rendering uses fill mode, so 0 can't be used there
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.word $0aef,$0080,$0080,$0861,$0c93,$0eb4,$0d66,$0f9a,$0777,$0f00,$0bbb,$ddd,$007b,$0ff0,$0000,$0fff
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statusBarPalette:
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.word $0888,$0aef,$0F00,$0861,$0c93,$0eb4,$0d66,$0f9a,$00f0,$0fff,$0bbb,$ddd,$007b,$0000,$0ff0,$0fff
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quitRequested:
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.word $0000
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mapScrollRequested:
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.word $FFFF
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angleDeltaRequested:
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.word $0000
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powerDeltaRequested:
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.word $0000
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fireRequested:
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.word $0000
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turnRequested:
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.word $0000
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terrainDirty:
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.word 1
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projectilesDirty:
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.word 1
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inventoryDirty:
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.word 1
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currentPlayer:
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.word 0
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gameOver:
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.word -1 ; Player index of winner
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projectileActive:
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.word -1 ; Y offset of active shot
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paused:
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.word 0
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globalWind:
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.word 0 ; 12.4 velocity
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; Position of map viewing window. Can be visualized in two ways:
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; a) Word-distance from right edge of terrain data (which is in memory right-to-left) to left edge of visible screen
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; b) Byte-distance from left edge of logical terrain to left edge of visible screen
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; c) Byte-distance from left edge of logical terrain to right edge of visible screen minus game object width in words
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mapScrollPos:
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.word 0
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;leftScreenEdge = $6E ; Moved to zero page for speed and cross-bank convenience
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; .word 0
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rightScreenEdge:
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.word 160-GAMEOBJECTWIDTH/4-1
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