GLsizei log_length = sizeof(info_log) - 1;
glGetShaderInfoLog(obj, log_length, &log_length, info_log);
info_log[log_length] = 0;
GLsizei log_length = sizeof(info_log) - 1;
glGetShaderInfoLog(obj, log_length, &log_length, info_log);
info_log[log_length] = 0;