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

	EGL_SYNC_FLUSH_COMMANDS_BIT_NV 0x0001
	EGL_SYNC_PRIOR_COMMANDS_COMPLETE_NV 0x30E6
	EGL_SYNC_STATUS_NV 0x30E7
	EGL_SIGNALED_NV 0x30E8
	EGL_UNSIGNALED_NV 0x30E9
	EGL_ALREADY_SIGNALED_NV 0x30EA
	EGL_TIMEOUT_EXPIRED_NV 0x30EB
	EGL_CONDITION_SATISFIED_NV 0x30EC
	EGL_SYNC_TYPE_NV 0x30ED
	EGL_SYNC_CONDITION_NV 0x30EE
	EGL_SYNC_FENCE_NV 0x30EF
	EGL_FOREVER_NV 0xFFFFFFFFFFFFFFFF
	EGL_NO_SYNC_NV EGL_CAST(EGLSyncNV,0)
	EGLint eglClientWaitSyncNV (EGLSyncNV sync, EGLint flags, EGLTimeNV timeout)
	EGLSyncNV eglCreateFenceSyncNV (EGLDisplay dpy, EGLenum condition, const EGLint* attrib_list)
	EGLBoolean eglDestroySyncNV (EGLSyncNV sync)
	EGLBoolean eglFenceNV (EGLSyncNV sync)
	EGLBoolean eglGetSyncAttribNV (EGLSyncNV sync, EGLint attribute, EGLint* value)
	EGLBoolean eglSignalSyncNV (EGLSyncNV sync, EGLenum mode)