[MAC] OpenGL render cannot work on MacOS

[runninglinuxkernel]

I wrote a code for display video, using SDL 2.30.10 + QT 5.15 on Mac M2 system.
the code like below :

sdl_window = SDL_CreateWindowFrom(window_id);
sdl_render = SDL_CreateRenderer(sdl_window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
ret = SDL_UpdateYUVTexture();

SDL_LockMutex(sdl_mutex);
SDL_RenderClear(sdl_render);
SDL_RenderCopy(sdl_render, sdl_texture, NULL, &rect);
SDL_RenderPresent(sdl_render);
SDL_UnlockMutex(sdl_mutex);

if I choose the Metal render by change the 2nd parameter of SDL_CreateRenderer(), the video widget can show the video, but other widgets cannot show, just black.
If I choose the OpenGL render on SDL_CreateRenderer(), the video widget show black, other widgets can show fine.

what is problem? does SDL can render via OPENGL on Mac?

[runninglinuxkernel]

test.zip

[runninglinuxkernel]

any one can help this ? i have uploaded the test code

[slouken]

Out of curiosity, does this work if you use SDL3 instead?

[runninglinuxkernel]

have not try it use SDL3, i still use SDL2

[icculus]

Almost certainly this is going to be some incompatibility between what we expect and what Qt provides. It's probably not OpenGL itself, which generally works on the Mac.

I assume this will not change anything, but can you try replacing void MainWindow::renderYUV() with this?

void MainWindow::renderYUV()
{
    SDL_SetRenderDrawColor(render, 255, 255, 255, 255);
    SDL_RenderClear(render);
    SDL_RenderPresent(render);
}

If the window turns white instead of black, then we know we're able to render something with OpenGL, and it's just rendering a YUV thing that's broken.. I assume it'll stay black, though, and I'll have to try to replicate it here to see what Qt is doing (or not doing) that causes problems.

[runninglinuxkernel]

Almost certainly this is going to be some incompatibility between what we expect and what Qt provides. It's probably not OpenGL itself, which generally works on the Mac.

I assume this will not change anything, but can you try replacing void MainWindow::renderYUV() with this?

void MainWindow::renderYUV()
{
SDL_SetRenderDrawColor(render, 255, 255, 255, 255);
SDL_RenderClear(render);
SDL_RenderPresent(render);
}
If the window turns white instead of black, then we know we're able to render something with OpenGL, and it's just rendering a YUV thing that's broken.. I assume it'll stay black, though, and I'll have to try to replicate it here to see what Qt is doing (or not doing) that causes problems.

I have try your suggestion, the window turns white, but the other widgets like QButton disappear.
BTW, I have try the SDL3, it works fine. The Qwidget and other Qbutton work fine. I think it is a bug on SDL2 on this case.

[slouken]

If SDL3 works, I would recommend using that instead.