GL_NV_robustness_video_memory_purge
http://www.opengl.org/registry/specs/NV/robustness_video_memory_purge.txt
GL_NV_robustness_video_memory_purge

	GL_EGL_GENERATE_RESET_ON_VIDEO_MEMORY_PURGE_NV 0x334C
	GL_PURGED_CONTEXT_RESET_NV 0x92BB
