GRIM: Framebuffer is not complete! status: 36054!

[lmerckx]

For GRIM engine, this error occurs with OpenGL and OpenGLES in fullscreen mode (tested on x64 and Raspberry PI2 and 3).

After some debugging, I came to the conclusion that OpenGLSdlGraphics3dManager::createOrUpdateScreen() is called before the initSize method.
So, variables _engineRequestedWidth and _engineRequestedHeight are still 0; which leads to the creation of a 0x0 frame buffer.
And causes the error and a black screen at startup.

A simple test like this at the beginning of createOrUpdateScreen() works but it is perhaps not the good solution:

if ((_engineRequestedWidth == 0) || (_engineRequestedHeight == 0))
  return;