A sort of game ....

it really is just a test for my pixel collision routine which I've just written.

It is the basis of a game, it's just not very hard, you can't fight back. You can just shoot the baddies (with the completely inappropriate hologram) and get a point each time you do it.

Still next up is the first proper game, which will be Asteroids, or really a simpler version of the Intellivision Astrosmash.

I did get Asteroids in 64x32 on a Studio2, but 7 x 6 resolution .... nope.

Studio II Asteroids

The code hasn't changed much, basically MovePlayerMissile skips if the missile is in flight - if you need to check collisions. It calls the new CheckCollision function, which skips itself if there is a collision, with the pixel ID in A + B. This object is killed, the PlayerMissile is killed, the score is bumped and round we go again.

I realised why the NOPs are there ; it's a feature of MoveUp/Down/Left/Right which the MoveXPlayer routines use.  I think I'll leave it.

    jsrp     Update
    jsrp     MoveHPlayer
    nop
    jsrp     MoveVPlayer
    nop

    jsrp     CheckFire
    jsrp     MovePlayerMissile
    jp         game_code

    lbi     0,PlayerMissile
    jsrp     CheckCollision
    jp         game_code

    jsrp     Kill
    jsrp    KillPlayerMissile   
    jsrp     BumpCounter
    jp         game_code