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| author | Miquel Sabaté Solà <mikisabate@gmail.com> | 2025-05-15 17:08:41 +0200 |
|---|---|---|
| committer | Miquel Sabaté Solà <mikisabate@gmail.com> | 2025-05-15 17:08:41 +0200 |
| commit | 72894d68c4fbd8c2b843afa70244dee3b6241414 (patch) | |
| tree | 3ecdb450605f1f98be280a189e79e7e866d8ce0a /src | |
| parent | f3062cb3e0dce519f6604af43b56f408537a8193 (diff) | |
| download | jetpac.nes-72894d68c4fbd8c2b843afa70244dee3b6241414.tar.gz jetpac.nes-72894d68c4fbd8c2b843afa70244dee3b6241414.zip | |
Add the skeleton code for enemies
Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
Diffstat (limited to 'src')
| -rw-r--r-- | src/driver.s | 1 | ||||
| -rw-r--r-- | src/enemies.s | 58 | ||||
| -rw-r--r-- | src/jetpac.s | 1 |
3 files changed, 60 insertions, 0 deletions
diff --git a/src/driver.s b/src/driver.s index 66846ac..3ed0536 100644 --- a/src/driver.s +++ b/src/driver.s @@ -86,6 +86,7 @@ @load_player: jsr Player::init jsr Bullets::init + jsr Enemies::init ;; Initialize pause timer. lda #0 diff --git a/src/enemies.s b/src/enemies.s new file mode 100644 index 0000000..ab67ccd --- /dev/null +++ b/src/enemies.s @@ -0,0 +1,58 @@ +.segment "CODE" + +.scope Enemies + ;; Maximum amount of enemies allowed on screen at the same time. + ENEMIES_POOL_CAPACITY = 3 + + ;; The capacity of the bullets pool in bytes. + ENEMIES_POOL_CAPACITY_BYTES = ENEMIES_POOL_CAPACITY * 3 + + ENEMIES_INITIAL_X = $F0 + + ;; TODO: 3 bytes a la bullets + zp_enemies_pool_base = $60 + + zp_enemies_timer = $D0 + zp_enemies_pool_size = $D1 + + .proc init + ldx #0 + stx zp_enemies_timer + + ldy #ENEMIES_POOL_CAPACITY + @enemies_init_loop: + lda #0 + sta zp_enemies_pool_base, x + + inx + lda #$80 ; TODO: random + sta zp_enemies_pool_base, x + + inx + lda #ENEMIES_INITIAL_X + sta zp_enemies_pool_base, x + + inx + + dey + bne @enemies_init_loop + + lda #ENEMIES_POOL_CAPACITY + sta zp_enemies_pool_size + + rts + .endproc + + ;; Definitions for all the enemy types. These are just the tile IDs for each + ;; case. Note that some of them have $FF, which is because they span 2 + ;; sprites instead of 4. +tiles: + .byte $26, $27, $36, $37 + .byte $28, $29, $38, $39 + .byte $24, $25, $34, $35 + .byte $2A, $2B, $3A, $3B + .byte $31, $32, $FF, $FF + .byte $41, $42, $FF, $FF + .byte $2C, $2D, $3C, $3D + .byte $2E, $2F, $3E, $3F +.endscope diff --git a/src/jetpac.s b/src/jetpac.s index ada5d1f..3b7ac18 100644 --- a/src/jetpac.s +++ b/src/jetpac.s @@ -41,6 +41,7 @@ .include "background.s" .include "player.s" .include "bullets.s" +.include "enemies.s" .include "title.s" .include "driver.s" .include "vectors.s" |