enemy: added basic walking guard

diff --git a/src/enemy.s b/src/enemy.s
index 4fc2725295257ab9f05488c356f1e5bfb33f13de..123f625573ee7ae72862dd9f7388b219b9b34e48 100644 (file)
--- a/src/enemy.s
+++ b/src/enemy.s
@@ -4,6 +4,12 @@
 act_enemy_guard:
        actdef ACT_T_GUARD, 0, 0, 10, 0
 
+#define ACT_GUARD_WALK_RIGHT 0
+#define ACT_GUARD_SHOOT 1
+#define ACT_GUARD_WALK_LEFT 2
+
+#define ACT_GUARD_MOVE_FRAMES 40
+
        ; updates the guard enemy
        ; inputs:
        ;               de: actor ptr
@@ -29,11 +35,100 @@ act_guard_update:
        ld a, RF_ENEMY
        call actor_write_default_collider
 
+       ; call states
+       ld hl, act_state
+       add hl, de
+       ld a, [hl]
+       cp a, ACT_GUARD_WALK_RIGHT
+       jp z, act_guard_walk_right
+
+       cp a, ACT_GUARD_SHOOT
+       jp z, act_guard_shoot
+
+       cp a, ACT_GUARD_WALK_LEFT
+       jp z, act_guard_walk_left
+
        ret
 @despawn:
        call actor_despawn
        ret
        
+       ; guard shoot state
+       ; inputs:
+       ;               de: actor 
+act_guard_shoot:
+       ; TODO
+       ld hl, act_state
+       add hl, de
+       ld a, ACT_GUARD_WALK_LEFT
+       ld [hl], a
+       ret
+       
+       ; actor walk left state
+       ;       inputs:
+       ;               de: actor ptr
+       ;       uses:
+       ;               p0 as timer
+act_guard_walk_left:
+       ; walk
+       ld hl, act_pos_x
+       add hl, de
+       ld a, [hl]
+       dec a
+       ld [hl], a
+       
+       ; process timer
+       ld hl, act_p0
+       add hl, de
+       ld a, [hl]
+       inc a
+       ld [hl], a
+       cp a, ACT_GUARD_MOVE_FRAMES 
+       jr nz, @not_done REL
+               ; clear p0 and transition
+               xor a, a
+               ld [hl], a
+
+               ld hl, act_state
+               add hl, de
+               ld a, ACT_GUARD_WALK_RIGHT
+               ld [hl], a
+@not_done:
+       ret
+       
+       ; walk right state
+       ; inputs:
+       ;               de: actor ptr
+       ;       uses:
+       ;               p0 as timer
+act_guard_walk_right:
+       ; walk
+       ld hl, act_pos_x
+       add hl, de
+       ld a, [hl]
+       inc a
+       ld [hl], a
+       
+       ; process timer
+       ld hl, act_p0
+       add hl, de
+       ld a, [hl]
+       inc a
+       ld [hl], a
+       cp a, ACT_GUARD_MOVE_FRAMES ; how many frames do we walk?
+       jr nz, @not_done REL
+               ; clear p0 and transition
+               xor a, a
+               ld [hl], a
+       
+               ld hl, act_state
+               add hl, de
+               ld a, ACT_GUARD_SHOOT
+               ld [hl], a
+
+@not_done:
+       ret
+       
        ; draws the guard enemy
        ; inputs:
        ;               de: actor ptr
@@ -90,4 +185,14 @@ act_guard_init:
        add hl, de
        ld a, 4
        ld [hl], a
+       
+       xor a, a
+       ld hl, act_state
+       add hl, de
+       ld [hl], a
+
+       ld hl, act_p0
+       add hl, de
+       ld [hl], a
+
        ret