[Mesa-dev] [RFC PATCH 1/1] st/dri: add a new driconf option override_glsl_version for ARK games

[Samuel Pitoiset]

On 02/08/2017 02:23 PM, Eero Tamminen wrote:
> Hi,
>
> On 07.02.2017 15:29, Gustaw Smolarczyk wrote:
>> 2017-02-07 14:11 GMT+01:00 Eero Tamminen <eero.t.tamminen at intel.com>:
>>> Thanks, setting breakpoint on SDL_ShowMessageBox() I can catch where it
>>> shows the dialog, but it appears to link SDL statically and not have
>>> debug
>>> symbols so that I could directly get the message.
>>>
>>> Unfortunately my gdb/assembly-foo is too weak to parse UTF-16 strings
>>> through pointers in stack (or is register passing using on Intel for
>>> subset
>>> of args?)...
>>
>> On x86-64 [1], the first argument should be in rdi register. If SDL2
>> is used, it will point to SDL_MessageBoxData structure [2] which
>> should have the message pointer at offset 24.
>>
>> [1]
>> https://en.wikipedia.org/wiki/X86_calling_conventions#System_V_AMD64_ABI
>> [2] https://wiki.libsdl.org/SDL_MessageBoxData
>
> Thanks!
>
> In case somebody else needs to debug something similar, log is at bottom
> [1].
>
>
> While the updated patch doesn't get ARK running on Intel, just
> overriding the Mesa GLSL version [1] from command line actually does
> (e.g. with 320).
>
> After that, the game main menu loads fine, but during actual single
> player game loading, it still crashes, like with Mesa 11.2.
>
> "diagnostics.txt" file under
> ShooterGame/Binaries/Linux/crashinfo-*/diagnostics.txt tells following:
> ------------------------------
> Exception was "SIGSEGV: invalid attempt to access memory at address
> 0x00000003"
> ...
> Invalid BufferCount=0 while reading
> ../../../ShooterGame/Content/PrimalEarth/Effects/Materials/environment/M_FX_countdown.uasset.
> Pos=1886238581, Size=186863, PrecacheSize=2147483647,
> PrecacheOffset=1886238581
> ------------------------------
>
> Above was with "ARK: Survival Evolved".  I took also a look at the
> free-to-play "ARK: Survival of the Fittest", but as it didn't have
> single player mode, I wasn't able to test it except to lobby.
>
> Btw It's fairly educating to check what files the game is accessing:
>     strace -f -e open -p $(pidof ShooterGame)
>
> (Is it expecting CPU topology to change multiple times each frame?)
>
>
>     - Eero
>
> [1]
>
> (gdb) disassemble
> Dump of assembler code for function SDL_ShowMessageBox:
>    0x0000000002998545 <+0>:    push   %rbp
>    0x0000000002998546 <+1>:    mov    %rsp,%rbp
> => 0x0000000002998549 <+4>:    sub    $0x10,%rsp
>    0x000000000299854d <+8>:    mov    %rdi,-0x8(%rbp)
>    0x0000000002998551 <+12>:    mov    %rsi,-0x10(%rbp)
>    0x0000000002998555 <+16>:    mov    0x1b53094(%rip),%rcx
>    0x000000000299855c <+23>:    mov    -0x10(%rbp),%rdx
>    0x0000000002998560 <+27>:    mov    -0x8(%rbp),%rax
>    0x0000000002998564 <+31>:    mov    %rdx,%rsi
>    0x0000000002998567 <+34>:    mov    %rax,%rdi
>    0x000000000299856a <+37>:    callq  *%rcx
>    0x000000000299856c <+39>:    leaveq
>    0x000000000299856d <+40>:    retq
>
> (gdb) x/4xg $rdi
> 0x7fffffffdbb8:    0x0000000000000040    0x0000000000000000
> 0x7fffffffdbc8:    0x00007fffffffdb20    0x0000000008318f00
>
> <messagebox title>
> (gdb) print (char *) 0x00007fffffffdb20
> $8 = 0x7fffffffdb20 "Message"
> -> Yes this is the dialog title
>
> <messagebox text>
> (gdb) print (char *) 0x0000000008318f00
> $9 = 0x8318f00 "\200\220\061\b"
> -> Looks garbage
>
> <try UTF-16>
> (gdb) dump memory message.utf16 0x0000000008318f00 (0x0000000008318f00+256)
> ^Z
> [1]+  Stopped
> $ iconv -f UTF-16 -t UTF-8 < message.utf16
> <chinese looking characters>
> $ less message.utf16
> ------------------------------
> <80><90>^@^@^@^@^A^@^@^@hader cache file '/opt/steamapps/common/ARK
> SOTF/Engine/GlobalShaderCache-GLSL_430.bin' is missing.
>
> You're running a version of the application built to load COOKED content
> only, however no COOKED content was found. Consider cooking content for
> this build, or build and run the UNCOOKED version of the application
> instead.^@
> ------------------------------
> $ touch '/opt/steamapps/common/ARK
> SOTF/Engine/GlobalShaderCache-GLSL_430.bin'
>
>
> And then running the game again:
> ------------------------------
> Assertion failed: Tag == ReferenceTag
> [File:E:\ArkSotfSVN\Engine\Source\Runtime\Engine\Private\GlobalShader.cpp]
> [Line: 251]
> Global shader map binary file is missing GSMB tag.
>
> Thread 1 "ShooterGame" received signal SIGSEGV, Segmentation fault.
> 0x0000000000f09abb in _start ()
> ------------------------------
>
> -> GLSL version causes issue also on Intel.

Thanks for your investigation Eero. Note that this patch hasn't been 
tested on Intel (lack of hardware) but it works on RadeonSI at least.

>
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