webgl in offscreen mode

[Jonas]

Does offscreen CEF support WebGL?

I am asking because WebGL is not working in offscreen CefSharp for me, and I want to make sure the problem is not in CEF before I dig into CefSharp or just switch to CEF.

Thank you,
Jonas

[magreenblatt]

What OS and CEF version? It generally requires GPU acceleration which is disabled by default in current versions of cefclient when off-screen rendering is enabled (pass '--enable-gpu' command line flag to enable).

[Jonas]

Windows 7 and Cef r3.2357.1287.g861c26e. I pass --enable-gpu with no effect. GPU acceleration is present on the computer.

I am guessing the problem is with CefSharp or how I am using CefSharp. My main question for this forum is, Is WebGL supported in CEF offscreen mode? I am guessing it is since I haven't read otherwise.

[Jonas]

Also, I am getting the following errors when CEF initializes:

[1211/172558:ERROR:gl_surface_egl.cc(173)] eglInitialize failed with error UNKNOWN
[1211/172558:ERROR:gl_surface_win.cc(152)] GLSurfaceEGL::InitializeOneOff failed.
[1211/172558:ERROR:gpu_child_thread.cc(163)] Exiting GPU process due to errors during initialization

[magreenblatt]

My main question for this forum is, Is WebGL supported in CEF offscreen mode?

Yes. It may be broken on your system for some reason. How does it behave in Google Chrome or with windowed rendering in cefclient? You can download the cefclient sample application and run "cefclient.exe --off-screen-rendering-enabled --enable-gpu" on your system to verify the behavior with off-screen rendering.

[Jonas]

WebGL works correctly in Chrome and in cefclient in offscreen mode. So, that confirms WebGL works as expected in CEF.
I'll have to dig deeper into CefSharp to find the issue.

Thank you for helping me to better isolate the issue.
Jonas

[amaitland]

WebGL works correctly in Chrome and in cefclient in offscreen mode. So, that confirms WebGL works as expected in CEF.
I'll have to dig deeper into CefSharp to find the issue.

Thank you for helping me to better isolate the issue.
Jonas

What version of `CefSharp` are you using? Which version of `cefclient` did you compare it to?

If you try using the `CefSharp.MinimalExample.Wpf` project to load your url does it work there? (`WPF` uses `OSR` rendering)

https://github.com/cefsharp/CefSharp.MinimalExample

[Jonas]

I am using:
CefSharp 43.0.1.0
CefClient v1.0 based on Cef 3.2556.1368.g535c4fb

My code is based on the offscreen example, but I see that my CefSharp version is based on a slightly older Cef version than the CefClient uses.

[amaitland]

It's probably worth trying the `45.0.0` release, which is based on 3.2454.1344

[Jonas]

I upgraded to CefSharp 45. WebGL is still not working.

I guess the next step is to see if I can get the WinForms example and the OffScreen example to work with WebGL.