int width = glretrace::parseAttrib(attrib_list, GLX_PBUFFER_WIDTH, 0);
int height = glretrace::parseAttrib(attrib_list, GLX_PBUFFER_HEIGHT, 0);
int width = glretrace::parseAttrib(attrib_list, GLX_PBUFFER_WIDTH, 0);
int height = glretrace::parseAttrib(attrib_list, GLX_PBUFFER_HEIGHT, 0);