A C64 Game - Step 92

Poor Sam was left out again. Now he can kill the boss too.



Since the boss is a special beast you wouldn't want Sam just to stand there and kill him without any reaction.

We add a new variable BOSS_HELD, similar to the SPRITE_HELD value.
So if SAM hurts the enemy, and it's the boss, the boss is released from Sam's grip:

          dec SPRITE_HP,x
          beq .EnemyKilled

          ;enemy was hurt
          lda BOSS_HELD
          beq .EnemyWasHurt

          ;release if end boss
          jmp .SamNotFirePushed

BOSS_HELD is set to 1 if Sam has the boss in his force grip. We check if the sprite caught is the last boss or one of his parts:

.EnemyHit
          ;enemy hit!
          stx SPRITE_HELD
          ldy SPRITE_HELD
          inc SPRITE_HELD
          lda SPRITE_ACTIVE,y
          cmp #TYPE_BOSS7
          beq .HoldingBoss

          cmp #TYPE_BOSS_PART
          beq .HoldingBoss

          jmp .NotHoldingBoss

.HoldingBoss
          sty BOSS_HELD
          inc BOSS_HELD

.NotHoldingBoss

Therefore we also need to clear the bit in case the enemy or Sam is killed:

!zone KillEnemy
KillEnemy
          ;is the enemy currently held?
          ldy SPRITE_HELD
          dey
          sty PARAM4
          cpx PARAM4
          bne .WasNotHeld

          lda #0
          sta SPRITE_HELD
          sta BOSS_HELD

Obviously the boss should not move when being caught, so in BehaviourBoss7 we add an early bail out:

.NoHitBack
          lda BOSS_HELD
          beq +
          rts

+

The step also adds a few bug fixes, as in the boss not auto-moving the bats he spawned (as if they were body parts).

Have fun!


step92.zip