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62 lines
2.0 KiB
62 lines
2.0 KiB
; Memory layout:
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; 0000-000F: scratch space for functions.
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; 0010-0011: controller state of joypad #1.
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; 0012-0013: controller state of joypad #2.
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; 0014-0016: 24-bit counter of vblanks.
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; 0017-0019: RGB color values to use for background color, from [0-31].
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; 001A-001B: 16-bit pointer to next random byte.
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; 001C-001D: 16-bit high-score.
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; [gap]
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; 0020-0021: (x, y) coordinates of player.
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; 0022: player health.
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; 0023: shot cooldown timer.
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; 0024: next-shot state.
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; 0025: number of frames until the next enemy ship spawns.
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; 0026-0027: player score.
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; [gap]
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; 0030-003F: (x, y) velocities of each of the 8 possible shot states.
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; 0040-009F: {sprite, x, y, x-velocity, y-velocity, unused} per player shot.
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; If sprite is 0, the shot is disabled.
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; 00A0-015F: As above, for enemy shots.
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; 0160-????: {sprite, x, y, move AI type, shoot AI type, shot cooldown}
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; per enemy ship.
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; [gap]
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; Sprite table buffers -- copied each frame to OAM during VBlank, using DMA.
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; 1000-11FF: table 1 (4 bytes each: x/y coord, tile #, flip/priority/palette)
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; 1200-121F: table 2 (2 bits each: high x-coord bit, size)
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; 1220-12A0: scratch table. One byte per sprite for high x-coord & size.
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.define joy1 $10
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.define joy2 $12
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.define vBlankCounter $14
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.define backgroundRed $17
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.define backgroundGreen $18
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.define backgroundBlue $19
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.define randomBytePtr $1A
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.define highScore $1C
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.define playerX $20
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.define playerY $21
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.define playerHealth $22
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.define shotCooldown $23
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.define nextShotState $24
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.define enemyShipSpawnCooldown $25
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.define playerScore $26
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.define shotVelocityTable $30
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.define playerShotArray $40
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.define playerShotArrayLength 16
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.define enemyShotArray $A0
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.define enemyShotArrayLength 32
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.define shotSize 6
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.define enemyShipArray $160
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.define enemyShipArrayLength 8
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.define enemyShipSize 6
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.define numSprites 128
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.define spriteTableStart $1000
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.define spriteTable1Size $200
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.define spriteTable2Start $1200
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.define spriteTableSize $220
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.define spriteTableScratchStart $1220
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