depth_buf.set_wrap(CLAMP_TO_EDGE);
depth_buf.storage(DEPTH_COMPONENT, size, size);
fbo.attach(DEPTH_ATTACHMENT, depth_buf, 0);
depth_buf.set_wrap(CLAMP_TO_EDGE);
depth_buf.storage(DEPTH_COMPONENT, size, size);
fbo.attach(DEPTH_ATTACHMENT, depth_buf, 0);