CEF OpenGL Implementation

[xDennis0811]

Hello everybody,
I successfully downloaded and get the CEFsimple application to run.I want now to implement that the browser gets rendered to a buffer and after this to a opengl texture.Where should I look first to do this ? I already know that I need a Render Class for this and set the window to Windowless but where should I start ? I appreciate any help

[magreenblatt]

You can look at the cefclient sample application. Run with the `--off-screen-rendering-enabled` command-line flag and review the source files under cefclient/browser that have osr in the name.

[xDennis0811]

I already tried this but I can't even compile the cefclient application I downloaded the cef binary with sample, compiled it with cmake and opened the visual studio solution but if I try to compile in VS the cefClient then I got many errors

[magreenblatt]

What VS version? What errors?

[xDennis0811]

Visual Studio version is 2017 Community Edition and the errors are:

Code: Select all

1>------ Build started: Project: cefclient, Configuration: Debug x64 ------
1>osr_window_win.obj : error LNK2019: unresolved external symbol "private: void __cdecl client::OsrWindowWin::EnsureRenderHandler(void)" (?EnsureRenderHandler@OsrWindowWin@client@@AEAAXXZ) referenced in function "private: virtual void __cdecl client::OsrWindowWin::OnAcceleratedPaint(class scoped_refptr<class CefBrowser>,enum cef_paint_element_type_t,class std::vector<class CefRect,class std::allocator<class CefRect> > const &,void *)" (?OnAcceleratedPaint@OsrWindowWin@client@@EEAAXV?$scoped_refptr@VCefBrowser@@@@W4cef_paint_element_type_t@@AEBV?$vector@VCefRect@@V?$allocator@VCefRect@@@std@@@std@@PEAX@Z)
1>C:\Users\Dennis\Downloads\cef_binary_3.3626.1886.g162fdec_windows64.tar\cef_binary_3.3626.1886.g162fdec_windows64\tests\cefclient\Debug\cefclient.exe : fatal error LNK1120: 1 unresolved externals
1>Done building project "cefclient.vcxproj" -- FAILED.
========== Build: 0 succeeded, 1 failed, 2 up-to-date, 0 skipped ==========



[magreenblatt]

Looks like the "#endif // defined(CEF_USE_ATL)" at the end of browser\osr_window_win.cc in in the wrong place. Moving it before the OsrWindowWin::EnsureRenderHandler method should fix your error.

[xDennis0811]

Okay it worked now thank you And what should I do now to understand the process of OpenGL texture rendering better ?

[magreenblatt]

The code in osr_window_win.cc, osr_render_handler_win_gl.cc and osr_renderer.cc is most relevant for GL rendering. It should be a good place to start.

[xDennis0811]

Okay thank you I will have a look into these files Can I use them too in a own project to work with it or isn't this possible ?

[magreenblatt]

CEF is BSD licensed, so you can use them.