EGL_EXT_output_base
https://www.khronos.org/registry/egl/specs/eglspec.1.5.pdf
EGL_EXT_output_base

	EGL_NO_OUTPUT_LAYER_EXT ((EGLOutputLayerEXT)0)
	EGL_NO_OUTPUT_PORT_EXT ((EGLOutputPortEXT)0)
	EGL_BAD_OUTPUT_LAYER_EXT 0x322D
	EGL_BAD_OUTPUT_PORT_EXT 0x322E
	EGL_SWAP_INTERVAL_EXT 0x322F
	EGLBoolean  eglGetOutputLayersEXT (EGLDisplay  dpy, const EGLAttrib * attrib_list, EGLOutputLayerEXT * layers, EGLint  max_layers, EGLint * num_layers)
	EGLBoolean  eglGetOutputPortsEXT (EGLDisplay  dpy, const EGLAttrib * attrib_list, EGLOutputPortEXT * ports, EGLint  max_ports, EGLint * num_ports)
	EGLBoolean  eglOutputLayerAttribEXT (EGLDisplay  dpy, EGLOutputLayerEXT  layer, EGLint  attribute, EGLAttrib  value)
	EGLBoolean  eglOutputPortAttribEXT (EGLDisplay  dpy, EGLOutputPortEXT  port, EGLint  attribute, EGLAttrib  value)
	EGLBoolean  eglQueryOutputLayerAttribEXT (EGLDisplay  dpy, EGLOutputLayerEXT  layer, EGLint  attribute, EGLAttrib * value)
	const char * eglQueryOutputLayerStringEXT (EGLDisplay  dpy, EGLOutputLayerEXT  layer, EGLint  name)
	EGLBoolean  eglQueryOutputPortAttribEXT (EGLDisplay  dpy, EGLOutputPortEXT  port, EGLint  attribute, EGLAttrib * value)
	const char * eglQueryOutputPortStringEXT (EGLDisplay  dpy, EGLOutputPortEXT  port, EGLint  name)