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Creating a SDL child window on a form or panel control?

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sysrpl:
I am attempting to use SDL2 on Linux (gtk2 widgetset) to create an OpenGL window inside a child control. I got the idea or impression that this was possible using the SDL_CreateWindowFrom function of SDL2, but all execution stops when I call the function.

Here is a bit of code from my TEmbedWindow class that is attempting to wrap a control / SDL OpenGL together in a class.

Does anyone have any suggestions as to how to get this working? Currently when the line with SDL_CreateWindowFrom  is reached, my program just exits.

Thank you for any suggestions you might have.


--- Code: Pascal  [+][-]window.onload = function(){var x1 = document.getElementById("main_content_section"); if (x1) { var x = document.getElementsByClassName("geshi");for (var i = 0; i < x.length; i++) { x[i].style.maxHeight='none'; x[i].style.height = Math.min(x[i].clientHeight+15,306)+'px'; x[i].style.resize = "vertical";}};} ---function TEmbedWindow.Start: Boolean;var  W: TXID;begin  Result := False;  // FAssociate is a TWinControl and has a x windows handle  if FAssociate = nil then    Exit;  // I have also tried with just SDL_INIT_VIDEO or SDL_INIT_TIMER  if SDL_Init(SDL_INIT_EVERYTHING) < 0 then    Exit;  // Configure the OpenGL context request  SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 8);  SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);  SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);  SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);  SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK,      SDL_GL_CONTEXT_PROFILE_ES);  // This gets the x window handle from a gtk2 based control  W := GDK_WINDOW_XWINDOW(PGtkWidget(PtrUInt(FAssociate.Handle))^.window);  // This line stops all execution  FWindow := SDL_CreateWindowFrom(Pointer(W));  // The program exits from the line above  if FWindow = nil then    Exit;  FCtx := SDL_GL_CreateContext(FWindow);  if FCtx = nil then    Exit;  SDL_GL_MakeCurrent(FWindow, FCtx);  FStarted := LoadGL(SDL_GL_GetProcAddress);  Result := FStarted;end; 

hukka:
I haven't tried this on Linux, but on Windows I can successfully embed SDL2 into a TPanel with

--- Code: Pascal  [+][-]window.onload = function(){var x1 = document.getElementById("main_content_section"); if (x1) { var x = document.getElementsByClassName("geshi");for (var i = 0; i < x.length; i++) { x[i].style.maxHeight='none'; x[i].style.height = Math.min(x[i].clientHeight+15,306)+'px'; x[i].style.resize = "vertical";}};} ---SDL_CreateWindowFrom(Pointer(HostPanel.Handle));

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