GL_ARB_ES3_compatibility
http://www.opengl.org/registry/specs/ARB/ES3_compatibility.txt
GL_ARB_ES3_compatibility
	GL_TEXTURE_IMMUTABLE_LEVELS 0x82DF
	GL_PRIMITIVE_RESTART_FIXED_INDEX 0x8D69
	GL_ANY_SAMPLES_PASSED_CONSERVATIVE 0x8D6A
	GL_MAX_ELEMENT_INDEX 0x8D6B
	GL_COMPRESSED_R11_EAC 0x9270
	GL_COMPRESSED_SIGNED_R11_EAC 0x9271
	GL_COMPRESSED_RG11_EAC 0x9272
	GL_COMPRESSED_SIGNED_RG11_EAC 0x9273
	GL_COMPRESSED_RGB8_ETC2 0x9274
	GL_COMPRESSED_SRGB8_ETC2 0x9275
	GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2 0x9276
	GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2 0x9277
	GL_COMPRESSED_RGBA8_ETC2_EAC 0x9278
	GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC 0x9279
