v1.0.0: Assertion failed / MTEngine crashed (Windows 10)

[jaluoto]

Newest version (RetroDebugger-v1.0.0-windows-x64-hotfix) crashes immediately on startup on my Lenovo X220 laptop with Windows 10. Previously I was using v0.64.72 and that still works fine.

First I get this error dialog:

---------------------------
Microsoft Visual C++ Runtime Library
---------------------------
Assertion failed!

Program: ...\RetroDebugger-v1.0.0\RetroDebugger-notsigned.exe
File: ..\..\..\src\Engine\Libs\imgui\imgui_impl_opengl3.cpp
Line: 464

Expression: bd != nullptr && "Context or backend not initialized! Did you call ImGui_ImplOpenGL3_Init()?"

For information on how your program can cause an assertion
failure, see the Visual C++ documentation on asserts

(Press Retry to debug the application - JIT must be enabled)
---------------------------
Abort   Retry   Ignore   
---------------------------

Then this:

---------------------------
MTEngine Crash
---------------------------
MTEngine crashed!

Exception: EXCEPTION_ACCESS_VIOLATION (0xC0000005)

Crash log saved to:
MTEngine-crash-20260621-004843-18244.txt

Minidump saved to:
MTEngine-crash-20260621-004843-18244.dmp

Please send these files for diagnosis.
---------------------------
OK   
---------------------------

Crash log:

=== MTEngine CRASH REPORT ===
Exception: 0xC0000005 (EXCEPTION_ACCESS_VIOLATION)
Address:   0x00007FF7CE7B8582
Thread:    2384
Process:   18244
Access violation reading address 0x0000000000000030

--- Call Stack ---
  [ 0] 0x00007FF7CE7B8582  RetroDebugger-notsigned.exe!<unknown> + 0x0
  [ 1] 0x00007FF7CE55BA5B  RetroDebugger-notsigned.exe!<unknown> + 0x0
  [ 2] 0x00007FF7CE55C402  RetroDebugger-notsigned.exe!<unknown> + 0x0
  [ 3] 0x00007FF7CE590BD4  RetroDebugger-notsigned.exe!<unknown> + 0x0
  [ 4] 0x00007FF7CE881194  RetroDebugger-notsigned.exe!<unknown> + 0x0
  [ 5] 0x00007FF7CF2C02A0  RetroDebugger-notsigned.exe!SDL_DYNAPI_entry + 0x119070
  [ 6] 0x00007FF7CF2C0026  RetroDebugger-notsigned.exe!SDL_DYNAPI_entry + 0x118DF6
  [ 7] 0x00007FFCDF0A7374  KERNEL32.DLL!BaseThreadInitThunk + 0x14
  [ 8] 0x00007FFCE049CC91  ntdll.dll!RtlUserThreadStart + 0x21
--- End Call Stack ---

Crash log: MTEngine-crash-20260621-004843-18244.txt
Minidump:  MTEngine-crash-20260621-004843-18244.dmp
=== END CRASH REPORT ===

I also have another Windows 10 computer and on that one v1.0.0 runs fine.

[slajerek]

Looks like your graphics card was not initialized, does it support OpenGL3 and shaders? I think we need more debug info to investigate this. I'll create a version with more debug logs.

[jaluoto]

Thanks for looking into it, I'll be happy to run more tests.

The GPU is Intel HD Graphics 3000 and according to GLview it supports OpenGL 3.1.0 and shading language version 1.40. The most recent device driver is from 2016 though.

[jaluoto]

I went backwards in versions and tested each public release after v0.64.72. The issue seems to have appeared in v0.64.74. It crashes the same way than v1.0.0.

[slajerek]

Yes, that's the version when I added CRT-looking shader to emulator screen and had to bump up the required shader version. I'll check to provide a fallback to older shader in case it's not available.