slajerek
OpenGL2 Backend
Describe the bug Segmentation fault on Debian 5.14.9-2 (2021-10-03) x86_64 GNU/Linux .
I compiled RetroDebugger and MTEngineSDL. Then started with gdb.
(gdb) r
Starting program: /home/wolf/git/RetroDebugger/build/retrodebugger
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7ffff627d640 (LWP 10873)]
[New Thread 0x7ffff43af640 (LWP 10875)]
[New Thread 0x7fffebfff640 (LWP 10876)]
[New Thread 0x7ffff3bae640 (LWP 10877)]
[New Thread 0x7ffff33ad640 (LWP 10878)]
[New Thread 0x7ffff2b64640 (LWP 10892)]
[New Thread 0x7ffff2b23640 (LWP 10893)]
Thread 1 "retrodebugger" received signal SIGSEGV, Segmentation fault.
CSlrMutex::Lock (this=0x0) at /home/wolf/git/MTEngineSDL/src/Engine/Core/SYS_Threading.cpp:179
179 SDL_LockMutex(mutex);
The same happens with the pre-compiled release alpha v0.64.60.04E.
Thread 1 "retrodebugger" received signal SIGSEGV, Segmentation fault.
CSlrMutex::Lock (this=0x0) at /home/wolf/git/MTEngineSDL/src/Engine/Core/SYS_Threading.cpp:179
179 SDL_LockMutex(mutex);
(gdb) bt
#0 CSlrMutex::Lock (this=0x0) at /home/wolf/git/MTEngineSDL/src/Engine/Core/SYS_Threading.cpp:179
#1 0x0000555555afd509 in VID_LockImageBindingMutex () at /home/wolf/git/MTEngineSDL/src/Engine/Core/VID_ImageBinding.cpp:49
#2 VID_PostImageBinding (image=0x55555878f8b0, dest=0x0) at /home/wolf/git/MTEngineSDL/src/Engine/Core/VID_ImageBinding.cpp:97
#3 0x0000555555af59b6 in RES_GetImageAsync (imageNameConst=<optimized out>, linearScaling=<optimized out>, resourceLevel=100,
fromResources=<optimized out>) at /home/wolf/git/MTEngineSDL/src/Engine/Core/RES_ResourceManager.cpp:334
#4 0x0000555555b2d935 in CGuiMain::CGuiMain (this=0x555558a3d5f0) at /home/wolf/git/MTEngineSDL/src/Engine/GUI/CGuiMain.cpp:31
#5 0x0000555555b2dd71 in GUI_Init () at /home/wolf/git/MTEngineSDL/src/Engine/GUI/GUI_Main.cpp:12
#6 0x0000555555afb7a6 in SYS_MTEngineStartup () at /home/wolf/git/MTEngineSDL/src/Engine/Core/SYS_Startup.cpp:83
#7 0x000055555564d140 in main (argc=1, argv=0x7fffffffe288) at /home/wolf/git/MTEngineSDL/platform/Linux/src.Linux/main.cpp:27
Hope this helps.
This should not be possible, it says the bindingMutex is NULL, when Lock is performed from SYS_Startup.cpp line 83, but it was init and created in VID_Init which is run from SYS_Startup line 71. Looks like more general problem and will require more investigation. I will create a branch with more debug logs to review what is going on.
Please pull most recent MTEngineSDL, and apply change in platform/Linux/Linux/src.Linux/DBG_Log.h, comment out line 15: #define GLOBAL_DEBUG_OFF (i.e. change to // #define GLOBAL_DEBUG_OFF or remove that line). Then please paste here all log which is printed before the crash.
11:48:11,057 0000 [MAIN] MTEngineSDL v3.06 compiled on Jan 16 2022 10:25:06 11:48:11,057 0000 [DEBUG] SYS_SetCommandLineArguments: argc=1 argv=f2385ef8 11:48:11,057 0000 [MAIN] SYS_InitFileSystem 11:48:11,057 0000 [DEBUG] gPathToCurrentDirectory=/home/wolf/git/RetroDebugger/build 11:48:11,057 0000 [DEBUG] pathToResources=./Documents/ 11:48:11,057 0000 [DEBUG] pathToDocuments=./Documents/ 11:48:11,057 0000 [DEBUG] gPathToTemp=./Documents/ 11:48:11,057 0000 [DEBUG] pathToSettings=/home/wolf/.RetroDebugger/ 11:48:11,057 0000 [MAIN] SYS_InitApplicationPauseResume() 11:48:11,057 0000 [DEBUG] C64DebuggerInitStartupTasks 11:48:11,057 0000 [DEBUG] C64DebuggerParseCommandLine0 11:48:11,057 0000 [MAIN] MTEngineSDL compiled SDL 2.0.18, linked with 2.0.18 11:48:11,074 0000 [MAIN] Resource manager INIT 11:48:11,075 0000 [TODO] SYS_SetThreadName 11:48:11,075 0000 [MAIN] RES_InitDeployFile 11:48:11,075 0000 [ERROR] CSlrFileFromDocuments: failed to open ./Documents/deploy/deploy 11:48:11,075 0000 [ERROR] CByteBuffer: file does not exist 11:48:11,075 0000 [WARN] Deploy file does not exist. 11:48:11,075 0000 [MAIN] RES_InitEmbeddedData 11:48:11,075 0000 [DEBUG] RES_AddFileToDeploy: /Engine/console-plain 3 11:48:11,075 0000 [DEBUG] RES_AddFileToDeploy: /Engine/console-inverted-plain 3 11:48:11,075 0000 [DEBUG] RES_AddFileToDeploy: /Engine/default-font 6 11:48:11,075 0000 [DEBUG] RES_AddFileToDeploy: /Engine/default-font 3 11:48:11,075 0000 [DEBUG] VID_GetGlSlVersion 11:48:11,075 0000 [DEBUG] VID_GetGlSlVersion: Linux: version 130 11:48:11,075 0000 [DEBUG] request #version 130 11:48:11,086 0000 [DEBUG] gMainWindow is 77f2a9b0 11:48:11,087 0000 [ERROR] Failed to create SDL GL Context. This is fatal! Error=Could not create GL context: GLXBadFBConfig
11:48:11,087 0000 [DEBUG] CSoundEngine::DebugPrintAudioDevices 11:48:11,087 0000 [DEBUG] ...SDL_GetNumAudioDevices returned -1 11:48:11,087 0000 [MAIN] CSoundEngine::SetOutputAudioDevice: deviceName=NULL 11:48:11,090 0000 [MAIN] CSoundEngine::SetOutputAudioDevice: opened device 1 Speicherzugriffsfehler
Thanks. The problem you experiencing is due to this:
Failed to create SDL GL Context. This is fatal! Error=Could not create GL context: GLXBadFBConfig
It seems your Linux does not support OpenGL 3. I will add a better information message box and not just crash, but this is fatal error, please check your Linux configuration.
You are right, this is an older laptop which uses the onboard Intel Graphics Chip. This is the output of glxinfo | grep OpenGL:
OpenGL vendor string: Intel Open Source Technology Center
OpenGL renderer string: Mesa DRI Intel(R) HD Graphics (ILK)
OpenGL version string: 2.1 Mesa 21.2.6
OpenGL shading language version string: 1.20
OpenGL extensions:
OpenGL ES profile version string: OpenGL ES 2.0 Mesa 21.2.6
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 1.0.16
OpenGL ES profile extensions:
Maybe it is possible to create the GUI without OpenGL 3? Some users might want to use it on older hardware as well. (On my more up-to-date desktop PC RetroDebugger works.)
This is actually a matter of selecting Backend for ImGui. There's a Backend for OpenGL2, I will check if it's easy to integrate: https://github.com/ocornut/imgui/tree/master/backends
I have now separated OpenGL3 and refactored so we can select backend, there's OpenGL3 and a draft Metal implementation (unfortunately not working due a bug in ImGui). It should be rather easy to add OpenGL2 now, I'll have a look.