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

	GLX_CONTEXT_PRIORITY_LEVEL_EXT 0x3100
	GLX_CONTEXT_PRIORITY_HIGH_EXT 0x3101
	GLX_CONTEXT_PRIORITY_MEDIUM_EXT 0x3102
	GLX_CONTEXT_PRIORITY_LOW_EXT 0x3103