SDL2 example crashes about pyimgui

[swistakm]

This is really interesting. Let's take care of #70 first and then I'll take a look at this one.

[swistakm]

Are you able to check and provide your SDL version? I will dig into sources.

[AileenLumina]

I am using the 2.0.8 stable release build for Win32 x64 provided at the official website.

[AileenLumina]

Might be relevant to mention that, after removing

    if SDL_GL_SetSwapInterval(1) < 0:
        print("Warning: Unable to set VSync! SDL Error: ", SDL_GetError())
        exit(1)

from the example, the issue remains.

[swistakm]

Hmm... At least we know that this is not related to SDL_GL_SetSwapInterval().

I have checked and example runs on macOS. I have similar problem when running on Windows in VirtualBox.

I will have to test on real non-virtualized windows box to be really sure bit seems to be related to OpenGL version. We can't get information about currently bound VBO. Maybe it is simply not supported by OpenGL in current context? Can you provide some more information about your environment like system version OpenGL version available etc. I already know it's windows.

It's weird because example requests OpenGL 4.1 Core profile with SDL_GL_SetAttribute(). Still, I've tested this on VBox and it seems that SDL2 silently passes the 2.1 no matter which one was requested. Glfw in similar situation correctly raises exception.

Maybe try adding print(gl.glGetString(gl.GL_VERSION)) to see if SDL_GL_SetAttribute(SDL_GL_CONTEXT_..._VERSION, ...) calls are effective at all. If you get anything below 3.0 then I suppose that current PySDL2 integration won't work for you as it uses features of programmable pipeline that won't be available in OpenGL 2.1.

I have created some proof of concept of SDL2 integration with fixed pipeline that may work in such case. Please try running it and tell me if it works. If so then I will try to find a way to nicely integrate this in the project. This is the gist with PoC: https://gist.github.com/swistakm/55af769339ab04f7101e2a8652fe35cb

Get Numpy and see if issue still remains, might be worth it just to check.

[swistakm]

I'm closing this because there was no follow-up. If anyone will have similar issue feel free to reopen.

[samkusin]

I experienced the same issue. In my situation, I noticed my OpenGL version was being reported at 1.1 (which didn't make sense given I was on a GTX 1070 with up to date drivers.)

Also I was using a RDP client for development purposes. Apparently OpenGL and remote desktop via RDP do not work very well together and this is a known issue (DirectX on the other hand is fully supported in RDP.)

Switching to a native/host desktop setup resolved the issue for me, and it works beautifully.

I suppose someone could work on a DX9 port of the renderer for pyimgui. I wish I had more time to do this though.