glFramebufferRenderbuffer(gl_FRAMEBUFFER, gl_DEPTH_ATTACHMENT, gl_RENDERBUFFER, depthbuffer)
var gl_error = glGetError
assert gl_error == gl_NO_ERROR else print_error gl_error
glFramebufferRenderbuffer(gl_FRAMEBUFFER, gl_DEPTH_ATTACHMENT, gl_RENDERBUFFER, depthbuffer)
var gl_error = glGetError
assert gl_error == gl_NO_ERROR else print_error gl_error