OpenGL Support Matrix

If OpenGL context can be provided by user, it should always be supported.

OpenGL context aslo can be created internally from native surface handle, and various kinds of context are supported.

Native GL context to create a client API

OS\API	OpenGL	OpenGL ES
Win32	WGL	WGL/EGL
WinRT		EGL
Linux	GLX/EGL	GLX/EGL
macOS	CGL/NSGL/GLX	EGL
iOS		EAGL
Android	EGL(?)	EGL

android may not support Desktop GL on EGL.

• EGL+OpenGL: must no OpenGLES
• Disable EGL: must no EGL
• EGL is preferred if Context::EGL is set
• OpenGLES is preferred if EGL and OpenGLES are set
• Desktop OpenGL is preferred if EGL is not set and OpenGL is set
• OpenGL from WGL/GLX: Context::OpenGL.
• OpenGLES from WGL/GLX: Context::OpenGLES

Native surface to create a context

OS\Surface	OpenGL	OpenGL ES
Win32	HWND	HWND
WinRT		ICoreWindow/ISwapChainPanel/IPropertySet
Linux	Window	Window/wl_egl_window/gbm_surface
macOS	NSWindow/NSView/CALayer	NSWindow/NSView/CALayer
iOS		UIView/CAEAGLLayer
Android	ANativeWindow	ANativeWindow
Raspberry Pi	Linux	EGL_DISPMANX_WINDOW_T/Linux
ARM Mali	Linux	fbdev_window/Linux