76 lines
4.5 KiB
PHP
76 lines
4.5 KiB
PHP
;-----------------------------------------------------------------------------
|
|
; zpvars.inc
|
|
; Part of penetrator, the zx spectrum game, made for Apple II
|
|
;
|
|
; Stefan Wessels, 2019
|
|
; This is free and unencumbered software released into the public domain.
|
|
|
|
;-----------------------------------------------------------------------------
|
|
.segment "ZEROPAGE"
|
|
|
|
;-----------------------------------------------------------------------------
|
|
; zero page variables
|
|
zWorldPtr: .res 2 ; where data is next read from the world stream
|
|
zVramH: .res 1 ; for HRG writes, points at the Hi of the back bank RAM
|
|
zScreenCol: .res 1 ; used for drawing - the column to draw
|
|
zEnemyCol: .res 1 ; used for enemies - the column to process
|
|
zCollision: .res 1 ; drawSprite will put a 1 in when there's a write collision
|
|
tempBlock: .res 22 ; used by different routines that need local storage
|
|
|
|
;-----------------------------------------------------------------------------
|
|
; zero page constants
|
|
; Bit patterns for the bit instruction
|
|
Bit1Mask: .res 1
|
|
Bit2Mask: .res 1
|
|
Bit3Mask: .res 1
|
|
Bit4Mask: .res 1
|
|
Bit5Mask: .res 1
|
|
Bit6Mask: .res 1
|
|
Bit7Mask: .res 1
|
|
Bit8Mask: .res 1
|
|
Bit12Mask: .res 1
|
|
Bit34Mask: .res 1
|
|
Bit76Mask: .res 1
|
|
Bit8432Mask: .res 1
|
|
Bit8765Mask: .res 1
|
|
|
|
;-----------------------------------------------------------------------------
|
|
; Game variables
|
|
numPlayers: .res 1 ; [0|1] where 0 is a 1 player game, 1 = 2 player game
|
|
activePlayer: .res 1 ; 0 for player 1, 1 for player 2
|
|
gameMode: .res 1 ; 0 for gameplay, 1 for trainer, 2 for edit
|
|
|
|
; per "run" variables
|
|
playerShipX: .res 1 ; x position in columns
|
|
playerShipY: .res 1 ; y position in rows
|
|
terrainOrigin: .res 1 ; from 0 to XSize - where to start world draw on screen
|
|
stopScrolling: .res 1 ; 1 - world will not move (for death)
|
|
playerDead: .res 1 ; 0 - gamePlay flow, > 0 players dead
|
|
monsterCnt: .res 1 ; skip # missiles before turning one into a monster
|
|
inFlight: .res 2 ; count launched missiles for launch control
|
|
victory: .res 1 ; 0 = not done, 1 = hit the nuke so done with run
|
|
nextStage: .res 1 ; -1 nothing, 0 at next stage, >0 count down
|
|
bufferInsert: .res 1 ; index where data gets added to buffers (right hand of screen)
|
|
bufferDraw: .res 1 ; index that corresponds to draw start (usually col 0 of screen)
|
|
bulletIndex: .res 1 ; like bufferDraw but bullets "travel" in opposite direction
|
|
dangerTickCount: .res 1 ; how often a dot is added to the danger line, when the world moves
|
|
dangerTickIdx: .res 1 ; the index into the text that holds the danger line of dots
|
|
moveHorz: .res 1 ; keeps track of horizontal movement - only moves every 2nd frame
|
|
moveVert: .res 1 ; keeps track of vertical movement - moves 4 rows but over 2 frames
|
|
|
|
; helper variables
|
|
updateHUD: .res 1 ; 0 - don't draw, 1+ - clean and redraw
|
|
flipFlop: .res 1 ; counter to advance explosion frames
|
|
backLayer: .res 1 ; [0|1] - Layer not shown to user *=(to be drawn to)
|
|
enemyHit: .res 1 ; the flags of the enemy destroyed in gameKillEnemy
|
|
enemyHitType: .res 1 ; 0 = nuke, 1 = missile, 2 = monster, 3 = radar, $ff - nothing
|
|
lastInput: .res 1 ; holds the value of the prev joystick frame
|
|
pause: .res 1 ; <> 0 when the game is paused
|
|
fireCoolDown: .res 1 ; decay to zero before fire allowed
|
|
pathPos: .res 1 ; index to start of file name in path
|
|
|
|
|
|
; audio variables
|
|
audioMask: .res 1 ; which audio "channels" are active (and with audioFrame)
|
|
audioFrame: .res 1 ; prioritized mask for sounds to make (msb to lsb)
|
|
audioExplFrame: .res 1 ; explosion frame index, for sound |