[GL3+] Add EGL Headless support #177
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It's already working but there's a lot of duct-taped code
CMake options added: - OGRE_GLSUPPORT_USE_GLX - OGRE_GLSUPPORT_USE_WGL - OGRE_GLSUPPORT_USE_EGL_HEADLESS When more than one of these options is enabled, it becomes possible to switch between them at runtime (WIP) Also add RenderSystem::getPriorityConfigOption & getNumPriorityConfigOptions so that important settings get set first
On Linux it would crash without an explanation of what's wrong
Fix texture copies from/to headless windows
Building with OGRE_CONFIG_UNIX_NO_X11 will avoid all X11 dependencies.
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The main goal of this PR is to run Ogre in cloud and other VM environments without X11 running or even installed.
New CMake flags:
Add EGL Headless support via EGL PBuffers (not to be confused with old and deprecated OpenGL PBuffers that competed with FBO in the 2000's)
Add GlSwitchableSupport which allows toggling between GLX and EGL PBuffers at runtime.
See Samples/2.0/Tutorials/Tutorial_EglHeadless/README.md for more information