GL_EXT_debug_marker http://www.khronos.org/registry/gles/extensions/EXT/EXT_debug_marker.txt GL_EXT_debug_marker void glInsertEventMarkerEXT (GLsizei length, const GLchar* marker) void glPushGroupMarkerEXT (GLsizei length, const GLchar* marker) void glPopGroupMarkerEXT (void)