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ReC98/th05/custom[bss].asm

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[Reverse-engineering] [th05] Custom entity structure On the surface, TH05 uses one single 26-byte structure for • the Stage 2 starfield, • Alice's puppets, • curve bullet heads, • Mai's snowballs and Yuki's fireballs, • Yumeko's knives, • and Shinki's 32×32 bullets. But looking closer, it turns out that the fields of all these have very different semantics, and in some cases, even different types. uth05win treated all of those as distinct structures, and we're going to do the same, merely overlaying the pointers onto the same generic array. Part of P0078, funded by iruleatgames and -Tom-.
2020-02-25 21:02:44 +00:00
CUSTOM_COUNT = 64
custom_t struc
db 26 dup (?)
custom_t ends
[Position independence] [th05] Custom entity 1: Stage 2 star particle structure Part of P0078, funded by iruleatgames and -Tom-.
2020-02-26 21:24:36 +00:00
; Stage 2 star particles
; ----------------------
S2PARTICLE_COUNT = 64
S2PARTICLE_W = 16
S2PARTICLE_H = 16
s2particle_t struc
flag db ?
S2P_angle db ?
pos motion_t <?>
zoom dw ?
dw 5 dup (?)
s2particle_t ends
s2particles equ <_custom_entities>
; ----------------------
[Position independence] [th05] Custom entity 2: Alice's puppets Heavily hardcoded for only two of them, even though there'd be space for 65, even without position independence. Puppet army mod when? Part of P0078, funded by iruleatgames and -Tom-.
2020-02-26 19:48:02 +00:00
; Alice's puppets
; ---------------
PUPPET_COUNT = 2
PUPPET_W = 32
PUPPET_H = 32
PUPPET_HP = 500
puppet_t struc
flag db ?
PUPPET_angle db ?
pos motion_t <?>
phase_frame dw ?
radius_motion label word
radius_gather label word
dw ?
PUPPET_patnum dw ?
PUPPET_hp_cur dw ? ; _cur to avoid a collision with PUPPET_HP
PUPPET_damage_this_frame dw ?
dw ?
puppet_t ends
puppets equ <_custom_entities>
puppet0 equ <puppets[0 * size puppet_t]>
puppet1 equ <puppets[1 * size puppet_t]>
; ---------------
[Reverse-engineering] [th05] Custom entity 3: Curve bullet head structure "Wait, the template has to store the color… hey, let's just overload the sprite ID field!" :zunpet: Completes P0078, funded by iruleatgames and -Tom-.
2020-02-26 22:37:53 +00:00
; Curve bullets
; -------------
curvebullet_template_t struc
db ?
CBTMPL_angle db ?
pos motion_t <?>
CBTMPL_age dw ?
dw ?
CBTMPL_col dw ?
dd ?
CBTMPL_speed db ?
db ?
curvebullet_template_t ends
curvebullet_head_t struc
flag db ?
CBH_angle db ?
pos motion_t <?>
CBH_age dw ?
dw ?
CBH_sprite dw ?
dd ?
CBH_speed db ?
db ?
curvebullet_head_t ends
curvebullet_template equ <_custom_entities>
curvebullet_heads equ <_custom_entities[1 * size curvebullet_head_t]>
; -------------
[Position independence] [th05] Custom entity 4: Mai's and Yuki's 32×32 balls Part of P0079, funded by -Tom-.
2020-02-27 20:06:35 +00:00
; Mai's and Yuki's 32×32 balls
; ----------------------------
B4BALL_COUNT = 63
B4BALL_W = 32
B4BALL_H = 32
b4ball_t struc
flag db ?
B4B_angle db ?
pos motion_t <?>
B4B_age dw ?
B4B_revenge dw ?
B4B_patnum_tiny_base dw ?
B4B_hp dw ?
B4B_damaged_this_frame dw ?
B4B_speed db ?
db ?
b4ball_t ends
b4ball_template equ <_custom_entities>
b4balls equ <_custom_entities[1 * size b4ball_t]>
; ------------------------------
[Reverse-engineering] [th05] Custom entity 5: Yumeko's knives Immediately understandable just by applying the structure fields. Part of P0079, funded by -Tom-.
2020-02-28 13:23:02 +00:00
; Yumeko's knives
; ---------------
KNIFE_COUNT = 63
KNIFE_W = 32
KNIFE_H = 32
knife_t struc
flag db ?
KNIFE_angle db ?
pos motion_t <?>
twirl_time dw ?
dw ?
KNIFE_patnum_tiny dw ?
KNIFE_decay_frames dw ?
dw ?
KNIFE_speed db ?
db ?
knife_t ends
knife_template equ <_custom_entities>
knives equ <_custom_entities[1 * size knife_t]>
; ---------------
[Reverse-engineering] [th05] Custom entity 6: Shinki's 32×32 balls Which need to be separate from Mai's and Yuki's 32×32 balls because… they have a delay cloud, whose radius absolutely has to be stored redundantly, rather then deriving it from the [age]? Same for the decay frame count. And the _update() function was copy-pasted from the knife one… Part of P0079, funded by -Tom-.
2020-02-28 21:40:34 +00:00
; Shinki's 32×32 balls
; --------------------
B6BALL_COUNT = 63
B6BALL_W = 32
B6BALL_H = 32
b6ball_t struc
flag db ?
B6B_angle db ?
pos motion_t <?>
B6B_age dw ?
cloud_radius dw ?
B6B_patnum_tiny dw ?
B6B_decay_frames dw ?
dw ?
B6B_speed db ?
db ?
b6ball_t ends
b6ball_template equ <_custom_entities>
b6balls equ <_custom_entities[1 * size b6ball_t]>
; --------------------
[Reverse-engineering] [th05] Custom entity structure On the surface, TH05 uses one single 26-byte structure for • the Stage 2 starfield, • Alice's puppets, • curve bullet heads, • Mai's snowballs and Yuki's fireballs, • Yumeko's knives, • and Shinki's 32×32 bullets. But looking closer, it turns out that the fields of all these have very different semantics, and in some cases, even different types. uth05win treated all of those as distinct structures, and we're going to do the same, merely overlaying the pointers onto the same generic array. Part of P0078, funded by iruleatgames and -Tom-.
2020-02-25 21:02:44 +00:00
public _custom_entities
[Reverse-engineering] [th05] Custom entity 6: Shinki's 32×32 balls Which need to be separate from Mai's and Yuki's 32×32 balls because… they have a delay cloud, whose radius absolutely has to be stored redundantly, rather then deriving it from the [age]? Same for the decay frame count. And the _update() function was copy-pasted from the knife one… Part of P0079, funded by -Tom-.
2020-02-28 21:40:34 +00:00
_custom_entities custom_t (CUSTOM_COUNT + 1) dup (<?>)