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

	EGL_BAD_OUTPUT_LAYER_EXT 0x322D
	EGL_BAD_OUTPUT_PORT_EXT 0x322E
	EGL_SWAP_INTERVAL_EXT 0x322F
	EGL_NO_OUTPUT_LAYER_EXT EGL_CAST(EGLOutputLayerEXT,0)
	EGL_NO_OUTPUT_PORT_EXT EGL_CAST(EGLOutputPortEXT,0)
	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)