125 lines
5.7 KiB
PHP
125 lines
5.7 KiB
PHP
;-----------------------------------------------------------------------------
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; defs.inc
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; Part of penetrator, the zx spectrum game, made for Apple II
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;
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; Stefan Wessels, 2019
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; This is free and unencumbered software released into the public domain.
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;-----------------------------------------------------------------------------
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; System locations
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PATHNAME = $0280
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ram_layer0 = $2000 ; HGR Pages
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ram_layer1 = $4000
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MLI = $BF00 ; ProDOS API
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SPEAKER = $C030 ; Access to toggle the speaker
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PADDL0 = $C064 ; Read to get POT
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PTRIG = $C070 ; Reset PADDLE values
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;-----------------------------------------------------------------------------
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; MLI call type bytes
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QUIT_CALL = $65
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OPEN_CALL = $C8
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READ_CALL = $CA
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WRITE_CALL = $CB
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CLOSE_CALL = $CC
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CREATE_CALL = $C0
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;-----------------------------------------------------------------------------
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; self-modifying address marker
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PLACEHOLDER = $FFFF
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;-----------------------------------------------------------------------------
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; modes
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GAME_MODE_PLAY = $00
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GAME_MODE_TRAIN = $01
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GAME_MODE_EDIT = $02
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BRUSH_TERRAIN = $00
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BRUSH_ENEMIES = $01
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;-----------------------------------------------------------------------------
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; digital input constants
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KEY_RIGHT = %00000001
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KEY_LEFT = %00000010
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KEY_DOWN = %00000100
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KEY_UP = %00001000
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KEY_START = %00010000
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KEY_SELECT = %00100000
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KEY_FIRE = %01000000
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KEY_BOMB = %10000000
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;-----------------------------------------------------------------------------
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; game constants
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XINSET = 4 ; By how many BYTE cols the display is offset into X
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XSIZE = (80 - (4 * XINSET)) ; columns on screen (1 BYTE col = 2 game cols)
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YSIZE = 192 ; lines on screen
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WORLD_START = $08 ; top line where world is drawn
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WORLD_END = $B3 ; last line where world is drawn
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BUFLENGTH = $100 ; size for buffers that hold enemies
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NUM_LIVES = 5 ; How many lives to start with
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NUM_STAGES = 5
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NUM_BOMBS = 2 ; How many bombs the player can drop
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NUM_INFLIGHT = 3 ; How many missiles can be in-flight at once
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NUM_SKIP_MONST = 4 ; How many rockets to skip before making one a monster
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DANGER_FONT = 4 ; Number of font characters that make one filled column
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DANGER_LENGTH = ((textEnd-1)-textDangerBar) ; how many characters in the danger column (skip trailing 0)
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DANGER_TICKS = ((((worldDataEnd-worldDataStart) / 3) / DANGER_LENGTH) / DANGER_FONT)
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; audio constants
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AUDIO_BOMB_DROP = %01000000 ; Releasing a bomb
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AUDIO_FIRE = %00100000 ; Firing the gun
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AUDIO_EXPLOSION = %00010000 ; An enemy exploding
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AUDIO_MOTOR_FWD = %00001000 ; Speeding up
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AUDIO_MOTOR_REW = %00000100 ; slowing down
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AUDIO_MOTOR_PLAY = %00000010 ; flying at a constant speed
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AUDIO_UI_TICK = %00000001 ; UI selection
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; The enemyBuffer is filled with these values, which break down as:
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;
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; Bits 1 & 2 - Type. 0 - monster, 1 - missile, 2 - radar & 3 - nuke
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; Bits 3 & 4 - Column of sprite - Missile 2 wide, radar 4 wide, etc.
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; Bits 5, 6 & 7 - Animation frame number, 0 - 7 (Radar has 8 frames)
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; Bit 8 - 1 - Flying, 0 - on ground
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;
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; For monsters, Bits 5, 6 and 7 mean the following:
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; Monster Bit 5 - Direction - 0 is up and 1 is down
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; Monster Bit 6 & 7 - The delay counter while it is stopped. 0 - moving, <> 0 paused
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;
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; All 0 means empty, no enemy at that location
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SPR_MONSTER0 = %10000000 ; enemy buffer mask MONSTER left
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SPR_MONSTER1 = %10000100 ; enemy buffer mask MONSTER col 2
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SPR_MONSTER2 = %10001000 ; enemy buffer mask MONSTER right
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SPR_MISSILE0 = %00000001 ; enemy buffer mask missile left
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SPR_MISSILE1 = %00000101 ; enemy buffer mask missile right
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SPR_RADAR0 = %00000010 ; enemy buffer mask radar left
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SPR_RADAR1 = %00000110 ; enemy buffer mask radar col 2
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SPR_RADAR2 = %00001010 ; enemy buffer mask radar col 3
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SPR_RADAR3 = %00001110 ; enemy buffer mask radar right
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SPR_NUKE0 = %00000011 ; enemy buffer mask nuke left
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SPR_NUKE1 = %00000111 ; enemy buffer mask nuke right
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MONSTER_HEIGHT = 13 ; rows in monster sprite
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MONSTER_WIDTH = 3 ; cols in monster sprite
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MONSTER_SPEED = 4 ; speed at which monster moves (in rows)
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MISSILE_HEIGHT = 14 ; rows in missile sprite
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RADAR_HEIGHT = 16 ; rows in radar sprite
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NUKE_HEIGHT = 8 ; rows in nuke sprite
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EXPLOSION_HEIGHT = 16 ; rows in explosion sprite
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BOMB_HEIGHT = 6 ; rows in bomb sprite
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BOMB_FRWRD_FRMS = 6 ; horz bomb travel duration
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SHIP_HEIGHT = 12 ; rows in player ship sprite
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SHIP_WIDTH = 4 ; cols in player ship sprite
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SHIP_START = 16 ; height above world where ship starts
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