gl.Flush()
Because any GL program might be executed over a network, or on an accelerator that buffers commands, all programs should
call gl.Flush()
whenever they count on having all of their previously issued commands completed. For example, call gl.Flush()
before waiting for user input that depends on the generated image.
gl.Flush()
can return at any time. It does not wait until the execution of all previously issued GL commands is complete.
Please consult an OpenGL reference manual for more information.
#GL_INVALID_OPERATION
is generated if gl.Flush()
is executed between the execution of gl.Begin() and the corresponding execution of gl.End() .