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Fundamentally, a core goal in rendering is for each frame displayed on the monitor to present a single, coherent image. There are several different strategies which are, or were, used in order to achieve this. In the following, I mention "vsync". Vsync is the moment at which the monitor begins drawing a new screen image; it's the point at which "vblank" ...


OpenGL never updates the screen, technically. There is a window system API that is separate from GL (e.g. GLX, WGL, CGL, EGL) that does this. Buffer swaps using these APIs generally implicitly invoke glFlush (...) but in some implementations (e.g. the GDI rasterizer on Windows) it does a full glFinish (...):       *On the left ...


Take a look at BufferStrategy, it's the preferred way to use multibuffering for java 2d, - and it works like a charm. Searching google for examples on how to use it should be straightforward :)

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