mirror of https://github.com/nmlgc/ReC98.git
[Reverse-engineering] [th01] Frame-based random number
Yes, no "generator", just a single number. Used to add some very minimal randomness to certain things, by taking it modulo a small number. Part of P0131, funded by Yanga.
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nmlgc
parent
21da5a330d
commit
bcdc073403
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@ -4,6 +4,12 @@ extern rank_t rank;
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extern bool bgm_mode;
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extern char bombs;
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extern char credit_bombs;
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// Current gameplay frame plus resident_t::rand, without any frame_delay().
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// Displayed as "rand" in the debug output, but can't be /* ZUN symbol */'d
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// like that, due to obviously colliding with the C standard library function.
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extern unsigned long frame_rand;
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extern char lives_extra;
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extern char stage_num;
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@ -2790,7 +2790,7 @@ loc_D414:
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add sp, 4
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pushd [dword_36C20]
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push _bomb_doubletap_frames
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pushd [_rand]
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pushd [_frame_rand]
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pushd [dword_34A62]
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push ds
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push offset aMain7luRand7lu ; " main:%7lu, rand:%7lu, bomb:%d, timer:%"...
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@ -2986,7 +2986,7 @@ loc_D54F:
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push ds
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push offset _continues_total
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push ds
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push offset _rand
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push offset _frame_rand
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push ds
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push offset _lives_extra
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push ds
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@ -3016,7 +3016,7 @@ loc_D583:
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idiv ebx
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inc ax
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mov word_34A8A, ax
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mov eax, _rand
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mov eax, _frame_rand
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mov random_seed, eax
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call _game_init
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call key_start
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@ -3658,7 +3658,7 @@ loc_DC3A:
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mov byte_36C1E, 0
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mov _input_shot, 0
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mov byte_34A47, 1
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mov eax, _rand
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mov eax, _frame_rand
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mov random_seed, eax
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mov _bomb_doubletap_frames, BOMB_DOUBLETAP_WINDOW
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mov _first_stage_in_scene, 0
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@ -3667,7 +3667,7 @@ loc_DC3A:
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; ---------------------------------------------------------------------------
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loc_DC64:
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inc _rand
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inc _frame_rand
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mov ax, _lives
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imul ax, 200
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mov dx, 1800
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@ -3678,7 +3678,7 @@ loc_DC64:
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sub dx, ax
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mov [bp+var_C], dx
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movsx ebx, [bp+var_C]
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mov eax, _rand
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mov eax, _frame_rand
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xor edx, edx
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div ebx
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cmp edx, 0
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@ -3713,7 +3713,7 @@ loc_DCCA:
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inc _orb_force_frame
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inc dword_34A62
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inc _bomb_doubletap_frames
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test byte ptr _rand, 3
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test byte ptr _frame_rand, 3
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jnz short loc_DCFA
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call sub_1938A
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@ -3839,7 +3839,7 @@ loc_DE72:
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call _z_vsync_wait_and_scrollup stdcall, 0
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pop cx
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les bx, _resident
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mov eax, _rand
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mov eax, _frame_rand
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mov es:[bx+reiidenconfig_t.rand], eax
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mov _test_damage, 0
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mov dword_34A62, 0C8h ; 'È'
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@ -19704,7 +19704,7 @@ loc_21AAE:
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jz short loc_21AE9
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loc_21AD5:
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pushd [_rand]
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pushd [_frame_rand]
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nopcall sub_22234
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add sp, 4
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cmp ax, 1
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@ -20256,7 +20256,7 @@ loc_21F23:
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cwd
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idiv bx
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movsx eax, dx
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mov edx, _rand
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mov edx, _frame_rand
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and edx, 1
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cmp eax, edx
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jnz short loc_21F7D
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@ -20378,7 +20378,7 @@ loc_2207D:
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cwd
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idiv bx
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movsx eax, dx
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mov edx, _rand
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mov edx, _frame_rand
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and edx, 1
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cmp eax, edx
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jnz short loc_220A1
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@ -20430,7 +20430,7 @@ loc_220F6:
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cwd
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idiv bx
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movsx eax, dx
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mov edx, _rand
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mov edx, _frame_rand
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and edx, 1
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cmp eax, edx
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jnz loc_221C1
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@ -25345,7 +25345,7 @@ sub_24FE0 proc far
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mov _boss_hp, 14
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mov _hud_hp_first_white, 10
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mov _hud_hp_first_redwhite, 6
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mov eax, _rand
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mov eax, _frame_rand
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mov random_seed, eax
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xor si, si
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jmp short loc_250B3
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@ -30775,7 +30775,7 @@ loc_2871C:
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call _graph_accesspage_func
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call _pagetrans_diagonal_8x8 stdcall, 40
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add sp, 0Ch
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mov eax, _rand
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mov eax, _frame_rand
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mov random_seed, eax
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pop si
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pop bp
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@ -36662,7 +36662,7 @@ loc_2C117:
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mov word_3B431, 0
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call @boss_palette_snap$qv
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call _stage_palette_set c, offset _z_Palettes, ds
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mov eax, _rand
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mov eax, _frame_rand
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mov random_seed, eax
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loc_2C14E:
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@ -37367,7 +37367,7 @@ loc_2C8AE:
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call sub_19E48
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pop cx
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mov word_3B431, 0
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mov eax, _rand
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mov eax, _frame_rand
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mov random_seed, eax
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call _mdrv2_bgm_fade_out_nonblock
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push 1
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@ -40895,7 +40895,7 @@ var_2 = word ptr -2
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mov word_3B529, 0
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mov _konngara_initial_hp_rendered, 0
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call @boss_palette_snap$qv
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mov eax, _rand
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mov eax, _frame_rand
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mov random_seed, eax
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jmp loc_2FC40
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; ---------------------------------------------------------------------------
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@ -43083,7 +43083,8 @@ _INIT_ ends
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public _credit_bombs
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_credit_bombs db ?
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byte_36C15 db ?
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_rand dd ?
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public _frame_rand
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_frame_rand dd ?
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dword_36C1A dd ?
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byte_36C1E db ?
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public _mode_debug
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