Skip to content

Latest commit

 

History

History

BioShock Remastered

Folders and files

NameName
Last commit message
Last commit date

parent directory

..
README.md
README.md
 
 

README.md

BioShock Remastered

Game info

TitleID: 0100AD10102B2000
Explanation based on:

  • Internal version: 1.0.2,
  • Nintendo version ID: v1/v65536
  • BID: D89FFAA2062E373D
  • Engine: Unreal Engine 2.5

Details

Game can go above 30 FPS with plugin alone, but we need to patch dynamic resolution frame timing to get better performance. Thanks to Kirby567Fan for finding relevant instructions.

How to find offsets

After analyzing main we need to find those bytes:

08 3E A8 D2 09 59 A8 D2

After going to result we need to find first instruction below that starts with

STR X0

This instruction stores pointer to dynamic resolution FPS factor in hardcoded offset in main. In IDA whole piece of code looks like this:

.text:000000710099D740                 MOV             X8, #0x41F00000
.text:000000710099D744                 MOV             X9, #0x42C80000
.text:000000710099D748                 MOV             X24, #0x42C80000
.text:000000710099D74C                 MOVK            X8, #0x4248,LSL#48
.text:000000710099D750                 MOVK            X9, #0x3F00,LSL#48
.text:000000710099D754                 MOVK            X24, #0x3F80,LSL#48
.text:000000710099D758                 STP             X8, X9, [X0]
.text:000000710099D75C                 MOV             X8, #0xC28F
.text:000000710099D760                 MOVK            X8, #0x4055,LSL#16
.text:000000710099D764                 MOV             X9, #0xCCCD
.text:000000710099D768                 MOVK            X9, #0x3DCC,LSL#16
.text:000000710099D76C                 MOVK            X8, #4,LSL#32
.text:000000710099D770                 STUR            X24, [X0,#0x2C]
.text:000000710099D774                 MOVK            X9, #0xCCCD,LSL#32
.text:000000710099D778                 MOVK            X9, #0x3DCC,LSL#48
.text:000000710099D77C                 STP             X8, X9, [X0,#0x10]
.text:000000710099D780                 MOV             X8, #0x40400000
.text:000000710099D784                 MOVK            X8, #0x4296,LSL#48
.text:000000710099D788                 STR             X8, [X0,#0x20]
.text:000000710099D78C                 MOV             W8, #1
.text:000000710099D790                 STR             W8, [X0,#0x28]
.text:000000710099D794                 ADRP            X26, #qword_71029B4BA0@PAGE
.text:000000710099D798                 STP             XZR, XZR, [X0,#0x38]
.text:000000710099D79C                 LDR             W8, [X25,#dword_71020C8244@PAGEOFF]
.text:000000710099D7A0                 STR             X0, [X26,#qword_71029B4BA0@PAGEOFF]

So pointer to our value is stored at MAIN+0x29B4BA0 Value is stored as float matching FPS target.

So for 30 FPS it will look like this:

30FPS:
  # Dynamic resolution FPS factor (default)
  -
    type: write
    address: [MAIN, 0x29B4BA0, 0]
    value_type: float
    value: 30