depth_buf.storage(DEPTH_COMPONENT32F, size, size, 1);
fbo.set_format((DEPTH_ATTACHMENT,DEPTH_COMPONENT32F));
fbo.attach(DEPTH_ATTACHMENT, depth_buf, 0);
depth_buf.storage(DEPTH_COMPONENT32F, size, size, 1);
fbo.set_format((DEPTH_ATTACHMENT,DEPTH_COMPONENT32F));
fbo.attach(DEPTH_ATTACHMENT, depth_buf, 0);