diff options
Diffstat (limited to 'src/enemies.s')
| -rw-r--r-- | src/enemies.s | 25 |
1 files changed, 22 insertions, 3 deletions
diff --git a/src/enemies.s b/src/enemies.s index 5cab560..b6bfdd2 100644 --- a/src/enemies.s +++ b/src/enemies.s @@ -12,6 +12,9 @@ .scope Enemies ;; Maximum amount of enemies allowed on screen at the same time. + ;; + ;; NOTE: EXPLOSIONS_POOL_CAPACITY depends on this value. If you update this, + ;; change it there. ENEMIES_POOL_CAPACITY = 3 ;; The capacity of the enemies pool in bytes. @@ -314,7 +317,7 @@ ;; regions are also tampered by this function. ;; ;; NOTE: this function assumes that the enemy is in a valid state. That's up - ;; to the caller to check on this before calling this function. + ;; to the caller to check before calling this function. .proc allocate_x_y ;; Save the 'y' index, as it's faster to do funny address arithmetics ;; and add 16 in the end than constantly 'iny' every time in the right @@ -383,7 +386,7 @@ lda tiles + 3, x sta OAM::m_sprites + 13, y ; bottom right - ;; The Y-coordinate for each sprite. + ;; The X-coordinate for each sprite. ldx Globals::zp_tmp1 lda Enemies::zp_enemies_pool_base + 2, x ; top left sta OAM::m_sprites + 3, y @@ -410,9 +413,25 @@ ;; about impacting bullets? ldx Enemies::zp_pool_index - ;; TODO: cloud animation and all that. + ;; Invalidate this enemy. lda #$FF sta Enemies::zp_enemies_pool_base, x + + stx Globals::zp_tmp0 + sty Globals::zp_tmp1 + + ;; Create an explosion for this enemy. + lda Enemies::zp_enemies_pool_base + 1, x + sta Globals::zp_arg2 + lda Enemies::zp_enemies_pool_base + 2, x + sta Globals::zp_arg3 + jsr Explosions::create + + ldx Globals::zp_tmp0 + ldy Globals::zp_tmp1 + + ;; The 'extra' value is now a "revive counter". Whenever it times out + ;; this enemy will be eligible to go back to life. lda #REVIVE_COUNTER sta Enemies::zp_enemies_pool_base + 3, x |