1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
|
Initialize_Entities:
LD A, $mem_bunny_mana
LD E, A
LD A, $mem_bunny_health
LD D, A
LD HL, $mem_entities_list
Clear_Entities.loop:
XOR A
LD (HL+), A
CP L
JR NZ, =Clear_Entities.loop
LD A, D
LD $mem_bunny_health, A
LD A, E
LD $mem_bunny_mana, A
CALL =Initialize_Bunny_Random_room
LD A, $00
LD $mem_enemies_alive_count, A
LD A, $mem_bunny_current_room_idx
LD $tmp_var_1, A
LD A, $ff
LD $mem_bunny_current_room_idx, A
LD A, $mem_dungeon_flags
BIT 2, A
JP Z, =Reset_Entities_Collision_Map
LD A, $00
LD $tmp_var_3, A
CALL =Initialize_Enemy
CALL =Initialize_Enemy
CALL =Initialize_Enemy
CALL =Initialize_Enemy
CALL =Initialize_Enemy
LD A, $tmp_var_1
LD $mem_bunny_current_room_idx, A
JP =Reset_Entities_Collision_Map
Initialize_Bunny_Random_room:
LD A, $ff
CALL =Pick_Random_Room_Avoid_A
LD $mem_bunny_current_room_idx, A
CALL =Pick_Room_position
Initialize_Bunny: ; BC is XY position
LD HL, $mem_entities_list
LD A, $01
LD (HL+), A
LD (HL), B
INC HL
LD (HL), C
CALL =Carve_Entity_Collision_Map
INC HL
LD A, $enum_direction_down
LD (HL), A
SWAP A
OR (HL)
LD (HL+), A
; Turn
LD A, $01
LD (HL+), A
; Action
LD A, $00
LD (HL+), A
INC HL ; skip health
LD A, $00
; Flags
LD (HL+), A
; Status
LD (HL+), A
LD A, L
AND $f0
ADD $10
LD L, A
RET
Initialize_Enemy: ; HL => pointer to entity struct
CALL =Enemy_idx_to_spawn
CP $ff
RET Z
ADD $03
Initialize_Entity: ; HL => pointer to entity struct, A => entity loaded index, 1 in $tmp_var_3 if should retry if collsion (could potentially fail multiple time/infinite loop)
LD E, A
SLA A
SLA A
LD B, A
SLA A
ADD B
INC A
LD (HL), A
LD A, $mem_bunny_current_room_idx
CALL =Pick_Room_position_Avoid_A
; Check if spawning on collisionable tile
CALL =Is_Collisionable
CP $00
JR Z, =.no_collision
XOR A
LD (HL), A
LD A, $tmp_var_3
CP $01
RET NZ
LD A, E
JP =Initialize_Entity
.no_collision:
INC HL
LD (HL), B
INC HL
LD (HL), C
INC HL
CALL =Carve_Entity_Collision_Map
POP BC
; Direction
LD A, $33
LD (HL+), A
LD A, E
CALL =Entity_idx_to_entity_list_ptr
INC BC
INC BC
; Turn
LD A, (BC)
LD (HL+), A
INC BC
; Action
LD A, (BC)
LD (HL+), A
INC BC
; Health
LD A, (BC)
LD (HL+), A
INC BC
XOR A
; flags & status
LD (HL+), A
LD A, (BC)
LD (HL+), A
INC BC
; Mana
LD A, (BC)
LD (HL+), A
LD A, L
ADD $06
LD L, A
LD A, E
CP $03
RET C
CP $07
RET NC
LD A, $mem_enemies_alive_count
INC A
LD $mem_enemies_alive_count, A
RET
FindFreeEntity:
LD HL, $mem_entities_list
FindFreeEntity.loop:
; This loop supposes that there is indeed enough space for a new entity
; to be spawn (thus the previous mem_enemies_alive_count).
; If entities are changed at some point to contain things that are not
; counted in mem_enemies_alive_count, this could result in an infinite loop.
; (Technically the quest goals can spawn other entities. We assume that the enemies alive count and the quest goal entities spawned will never exceed 15 together)
LD A, L
AND $f0
ADD $10
LD L, A
LD A, $00
CP (HL)
JR NZ, =FindFreeEntity.loop
RET
Respawn_Entities:
LD A, $mem_dungeon_flags
BIT 2, A
RET Z
LD A, $mem_moving_animation_step
CP $04
RET NZ
LD A, $mem_enemies_alive_count
CP $05
RET NC
LD A, $00
LD $tmp_var_3, A
CALL =RNG_Step
AND $07
CP $00
RET NZ
CALL =FindFreeEntity
CALL =Initialize_Enemy
RET
Enemy_spawn_pattern_to_probability: ; (1/(x + 1))
.DB 0b11111111
.DB 0b00000111
.DB 0b00000001
.DB 0b00000000
Enemy_idx_to_spawn: ; Return in A, ff if no entity to be spawned
PUSH BC
LD A, $mem_entity_spawning_pattern
LD B, A
CALL =RNG_Step
AND $03
LD C, A
SLA A
CALL =RRx
LD A, B
AND $03
PUSH DE
LD DE, =Enemy_spawn_pattern_to_probability
ADD E
LD E, A
LD A, D
ADC $00
LD D, A
LD A, (DE)
POP DE
LD B, A
CALL =RNG_Step
AND B
CP $00
LD A, $ff
JR NZ, =.skip_set_enemy_idx
LD A, C
.skip_set_enemy_idx:
POP BC
RET
.MACRODEF GET_ENTITY_IDX_SPAWN_RATE idx ; breaks BC & A
LD A, low($idx)
CALL =Entity_idx_to_entity_list_ptr
LD A, C
ADD $07
LD C, A
LD A, B
ADC $00
LD B, A
LD A, (BC)
AND $03
.END
|
