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Bug 4899

Summary: AMD "amdgpu" proprietary driver 19.30 and OpenGL video not working
Product: SDL Reporter: cpasjuste <cpasjuste>
Component: videoAssignee: Sam Lantinga <slouken>
Status: RESOLVED INVALID QA Contact: Sam Lantinga <slouken>
Severity: blocker    
Priority: P2    
Version: 2.0.10   
Hardware: x86_64   
OS: Linux   

Description cpasjuste 2019-12-16 14:02:41 UTC 
Hi,

I think i did spot a problem with SDL2, OpenGL AND the “amdgpu” proprietary drivers (v 19.30). It seems that OpenGL functions/proc addresses are not correctly set. While “SDL_GL_GetAttribute” are working fine, any call to any OpenGL function will either crash or return NULL (glGetString).

Please note that it’s working fine with NVIDIA, but also with OpenGLES 2 on the “amdgpu” proprietary drivers.

If i retrieve the function with:

const char *(*glGetString)(GLenum);
glGetString = (const char ()(GLenum)) SDL_GL_GetProcAddress(“glGetString”);

Then glGetString is working. Here is the output of the strings after “fixing” glGetString address:

GL vendor : X.Org
GL renderer : Radeon RX550/550 Series (POLARIS12, DRM 3.33.0, 5.0.0-36-generic, LLVM 9.0.0)
GL version : 4.5 (Core Profile) Mesa 19.2.0-devel
GL glsl : 4.50

Finally, note that when using glad loader, all is working fine.
Comment 1 cpasjuste 2019-12-16 14:17:59 UTC 
More information's:

Note that the testgl2 sample is working fine.
Here is the full (non working) code (that work with OpenGLES and NVIDIA OpenGL): https://github.com/Cpasjuste/libcross2d/blob/master/source/platforms/sdl2/sdl2_gl_renderer.cpp
Comment 2 Sam Lantinga 2019-12-16 18:24:09 UTC 
Please contact the libcross2d author. They should be using SDL_GL_GetProcAddress() to retrieve all OpenGL functions.

Thanks!
Comment 3 cpasjuste 2019-12-16 18:28:10 UTC 
I am the libcross2d author :)
I thought it was a bug as it's working fine on Nvidia and with gles2. But I got it! (I'm now using glad loader to simplify all this).

Thanks,
Cpasjuste.
Comment 4 Sam Lantinga 2019-12-16 20:38:15 UTC 
*laugh* Got it. I'm glad you found a solution. :)
Comment 5 cpasjuste 2019-12-16 20:46:28 UTC 
(In reply to Sam Lantinga from comment #4)
> *laugh* Got it. I'm glad you found a solution. :)

Very fun reply, not sure if it was intended ("glad"), i guess it was :)
I stop my flood now, and many thanks again for the fast support.
Comment 6 Sam Lantinga 2019-12-17 06:37:56 UTC 
You're welcome!