almost spawnining missiles
This commit is contained in:
Tyrel Souza
parent
0285ec619c
commit
37e998eb7e
@ -15,4 +15,4 @@ clean:
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# Rule to run the final cartridge .nes file in the FCEUX emulator
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###############################################################################
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run:
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on-workspace 6 "fceux atlantico.nes"
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on-workspace 4 "fceux atlantico.nes"
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@ -12,6 +12,4 @@
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Type .byte
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XPos .byte
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YPos .byte
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XVel .byte
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YVel .byte
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.endstruct
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@ -6,17 +6,22 @@
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.segment "ZEROPAGE"
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Buttons: .res 1 ; Pressed buttons (A|B|Select|Start|Up|Dwn|Lft|Rgt)
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PrevButtons: .res 1 ; Pressed buttons (A|B|Select|Start|Up|Dwn|Lft|Rgt) PREVIOUSLY
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XPos: .res 2 ; Player X 16-bit position (8.8 fixed-point): hi+lo/256px
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YPos: .res 2 ; Player Y 16-bit position (8.8 fixed-point): hi+lo/256px
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XPos: .res 1 ; Player X 16-bit position (8.8 fixed-point): hi+lo/256px
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YPos: .res 1 ; Player Y 16-bit position (8.8 fixed-point): hi+lo/256px
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XVel: .res 1 ; Player X (signed) velocity (in pixels per 256 frames)
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YVel: .res 1 ; Player Y (signed) velocity (in pixels per 256 frames)
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PrevSubmarine: .res 1 ; how long ago we added previous submarine in seconds
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Frame: .res 1 ; Counts frames (0 to 255 and repeats)
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IsDrawComplete: .res 1 ; Flag to indicate when vblank is done drawing
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Clock60: .res 1 ; Counter that increments per second (60 frames)
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BgPtr: .res 2 ; Pointer to background address - 16bits (lo,hi)
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SprPtr: .res 2 ; pointer to the sprite address - 16bits (lo,hi)
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XScroll: .res 1 ; Store the horizontal scroll position
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CurrNametable: .res 1 ; Store the current starting nametable (0 or 1)
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@ -27,8 +32,11 @@ SourceAddr: .res 2 ; The source address in ROM of the new c
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ParamType: .res 1 ; Used as param to subrouting
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ParamXPos: .res 1 ; Used as param to subrouting
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ParamYPos: .res 1 ; Used as param to subrouting
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ParamXVel: .res 1 ; Used as param to subrouting
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ParamYVel: .res 1 ; Used as param to subrouting
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ParamTileNum: .res 1 ; Used as param to subrouting
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ParamNumTiles: .res 1 ; Used as param to subrouting
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ParamAttribs: .res 1 ; Used as param to subrouting
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PrevOAMCount: .res 1 ; Store previous number of bytes sent to the OAM
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; Store enough space for an array of actors
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ActorsArray: .res MAX_ACTORS * .sizeof(Actor)
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@ -215,7 +223,7 @@ LoopButtons:
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;AddNewActor
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Subroutine to add new actor to the array in the first empty slot found
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;; Params: ParamType, ParamXPos, ParamYPos, ParamXVel, ParamYVel
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;; Params: ParamType, ParamXPos, ParamYPos, ParamYVel
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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.proc AddNewActor
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ldx #0
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@ -231,6 +239,7 @@ LoopButtons:
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adc #.sizeof(Actor)
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tax
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jmp ArrayLoop
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AddNewActorToArray:
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lda ParamType
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sta ActorsArray+Actor::Type,x
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@ -238,14 +247,239 @@ LoopButtons:
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sta ActorsArray+Actor::XPos,x
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lda ParamYPos
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sta ActorsArray+Actor::YPos,x
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lda ParamXVel
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sta ActorsArray+Actor::XVel,x
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lda ParamYVel
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sta ActorsArray+Actor::YVel,x
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EndRoutine:
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rts
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.endproc
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.proc SpawnActors
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SpawnSubmarine:
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lda Clock60 ; Submarines added in 3 second intervals
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sec ;
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sbc PrevSubmarine ;
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cmp #3 ; Only add if 3 seconds have pased
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bne :+ ;
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lda #ActorType::SUBMARINE ;
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sta ParamType ; Load Param for the actor type
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lda #223 ;
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sta ParamXPos ; Load X Pos
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lda #185 ;
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sta ParamYPos ;
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;
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jsr AddNewActor ; Call subroutine
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;
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lda Clock60 ;
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sta PrevSubmarine ; Save the current clocktime as the submarine clock spawn time
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:
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rts
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.endproc
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.proc UpdateActors
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ldx #0 ; counter of how many actors
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ActorsLoop:
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lda ActorsArray+Actor::Type,x
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cmp #ActorType::MISSILE
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bne :+
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;;Update y Pos
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;; y--
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lda ActorsArray+Actor::YPos,x
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sec
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sbc #1 ; Decrement Y Position
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sta ActorsArray+Actor::YPos,x ;
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bcs SkipMissile
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;; Delete Missile
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lda #ActorType::NULL
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sta ActorsArray+Actor::Type,x ;
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SkipMissile:
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jmp NextActor
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:
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cmp #ActorType::SUBMARINE
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bne :+
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;;Update x Pos
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;; x--
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lda ActorsArray+Actor::XPos,x
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sec
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sbc #1 ; Decrement X Position
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sta ActorsArray+Actor::XPos,x ;
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bcs SkipSubmarine
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;; Delete SUB
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lda #ActorType::NULL
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sta ActorsArray+Actor::Type,x ;
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SkipSubmarine:
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jmp NextActor
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:
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NextActor:
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txa
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clc
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adc #.sizeof(Actor)
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tax
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cmp #MAX_ACTORS * .sizeof(Actor)
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bne ActorsLoop
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rts
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.endproc
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.proc RenderActors
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lda #$02 ;
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sta SprPtr+1 ;
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lda #$00 ;
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sta SprPtr ; set SprPtr to $0200
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ldy #0 ; counter of how many tiles
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ldx #0 ; counter of how many actors
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ActorsLoop:
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lda ActorsArray+Actor::Type,x
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cmp #ActorType::SPRITE0
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bne :+
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;; Load Params with Y, TileNumber, Attribs, X,NumTiles=4
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lda ActorsArray+Actor::XPos,x
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sta ParamXPos
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lda ActorsArray+Actor::YPos,x
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sta ParamYPos
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lda #$70
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sta ParamTileNum
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lda #%00100000
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sta ParamAttribs
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lda #1
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sta ParamNumTiles
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jsr DrawSprite
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jmp NextActor
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:
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cmp #ActorType::PLAYER
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bne :+
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;; Load Params with Y, TileNumber, Attribs, X,NumTiles=4
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lda ActorsArray+Actor::XPos,x
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sta ParamXPos
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lda ActorsArray+Actor::YPos,x
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sta ParamYPos
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lda #$60
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sta ParamTileNum
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lda #%00000000
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sta ParamAttribs
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lda #4
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sta ParamNumTiles
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jsr DrawSprite
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jmp NextActor
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:
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cmp #ActorType::MISSILE
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bne :+
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;; Load Params with Y, TileNumber, Attribs, X,NumTiles=1
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lda ActorsArray+Actor::XPos,x
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sta ParamXPos
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lda ActorsArray+Actor::YPos,x
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sta ParamYPos
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lda #$50
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sta ParamTileNum
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lda #%00000001
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sta ParamAttribs
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lda #1
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sta ParamNumTiles
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jsr DrawSprite
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jmp NextActor
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:
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cmp #ActorType::SUBMARINE
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bne :+
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;; Load Params with Y, TileNumber, Attribs, X,NumTiles=1
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lda ActorsArray+Actor::XPos,x
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sta ParamXPos
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lda ActorsArray+Actor::YPos,x
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sta ParamYPos
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lda #$04
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sta ParamTileNum
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lda #%00000000
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sta ParamAttribs
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lda #4
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sta ParamNumTiles
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jsr DrawSprite
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jmp NextActor
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:
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NextActor:
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txa
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clc
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adc #.sizeof(Actor)
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tax
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cmp #MAX_ACTORS * .sizeof(Actor)
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beq :+
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jmp ActorsLoop
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:
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tya
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pha ; Save Y to the Stack
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LoopTrailingTiles:
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;; Loop all bytes until we reach PrevOAMCount
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cpy PrevOAMCount
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bcs :+
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lda #$FF
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sta (SprPtr),y ; set Y position to $ff to hide
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iny ;
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sta (SprPtr),y ; Set tile number as $FF
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iny ;
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sta (SprPtr),y ; Set attribs as $FF
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iny ;
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sta (SprPtr),y ; Setr X Position to $FF to hide tile
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iny ;
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jmp LoopTrailingTiles
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:
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pla
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sta PrevOAMCount
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rts
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.endproc
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Routine to loop "NumTiles" times, sending bytes to the OAM-RAM
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;; Params = ParamXPos, ParamYPos, ParamTileNum, ParamAttribs, ParamNumTiles
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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.proc DrawSprite
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txa ;push x to stack
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pha ; save value of X register before anything
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ldx #0
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TileLoop:
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lda ParamYPos
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sta (SprPtr),y ; Send Y Position to Ram
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iny
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lda ParamTileNum ; Send Tile# to the OAM
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sta (SprPtr),y ;
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inc ParamTileNum ; ParamTileNum++
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iny
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lda ParamAttribs ; Send Attribs to the OAM
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sta (SprPtr),y
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iny
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lda ParamXPos ; Send X Position to the OAM
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sta (SprPtr),y
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clc
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adc #8
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sta ParamXPos ; increment X Pos 8 pixels
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iny
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inx ; X++
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cpx ParamNumTiles ; loop NumTiles times
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bne TileLoop
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; pop x from stack
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pla
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tax ; pull value of X from stack and transfer to x
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rts
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.endproc
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Reset handler (called when the NES resets or powers on)
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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@ -274,9 +508,6 @@ AddSprite0:
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sta ParamXPos
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lda #27
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sta ParamYPos
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lda #0
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sta ParamXVel
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sta ParamYVel
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jsr AddNewActor
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AddPlayer:
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@ -286,9 +517,6 @@ AddPlayer:
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sta ParamXPos
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lda YPos
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sta ParamYPos
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lda #0
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sta ParamXVel
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sta ParamYVel
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jsr AddNewActor
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InitBackgroundTiles:
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@ -361,6 +589,9 @@ EnableRendering:
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;;;;;;; START GAME LOOP
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GameLoop:
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lda Buttons
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sta PrevButtons
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;Perform Game Logic Here
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jsr ReadControllers
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@ -368,26 +599,21 @@ CheckAButton:
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lda Buttons
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and #BUTTON_A
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beq :+
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lda YPos
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lda Buttons
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and #BUTTON_A ; DEBOUNCE A PRESS
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cmp PrevButtons ; Compare current buttons and check if A was previously pressed
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beq:+
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lda #ActorType::MISSILE
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sta ParamType
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lda XPos
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sta ParamXPos
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lda YPos
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sta ParamYPos
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lda #0
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sta ParamXVel
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lda #255
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sta ParamYVel
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jsr AddNewActor
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:
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;; TODO
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;;------------------
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;jsr SpawnActors
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;jsr UpdateActors
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;jsr RenderActors
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;;------------------
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jsr SpawnActors
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jsr UpdateActors
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jsr RenderActors
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WaitForVBlank: ; we lock execution
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lda IsDrawComplete ; check and only perform game loop call once NMI is done drawing
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@ -433,26 +659,26 @@ NewAttribsCheck:
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jsr DrawNewAttribs
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:
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;SetPPUNoScroll:
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; lda #0
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; sta PPU_SCROLL
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; sta PPU_SCROLL
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;
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;EnablePPUSprite0:
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; lda #%10010000
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; sta PPU_CTRL
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; lda #%00011110
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; sta PPU_MASK
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;
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;WaitForNoSprite0:
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; lda PPU_STATUS
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; and #%01000000
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; bne WaitForNoSprite0
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;
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;WaitForSprite0:
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; lda PPU_STATUS
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; and #%01000000 ; PPU address $2002 bit 6 is the sprite hit flag
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; beq WaitForSprite0 ; loop until we do NOT have a sprite 0 hit
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SetPPUNoScroll:
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lda #0
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sta PPU_SCROLL
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sta PPU_SCROLL
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EnablePPUSprite0:
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lda #%10010000
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sta PPU_CTRL
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lda #%00011110
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sta PPU_MASK
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WaitForNoSprite0:
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lda PPU_STATUS
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and #%01000000
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bne WaitForNoSprite0
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WaitForSprite0:
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lda PPU_STATUS
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and #%01000000 ; PPU address $2002 bit 6 is the sprite hit flag
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beq WaitForSprite0 ; loop until we do NOT have a sprite 0 hit
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ScrollBackground:
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inc XScroll ; XScroll++
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