Class DefaultGLCapabilitiesChooser

  • All Implemented Interfaces:
    CapabilitiesChooser, GLCapabilitiesChooser
    Direct Known Subclasses:

    public class DefaultGLCapabilitiesChooser
    extends Object
    implements GLCapabilitiesChooser

    The default implementation of the GLCapabilitiesChooser interface, which provides consistent visual selection behavior across platforms. The precise algorithm is deliberately left loosely specified. Some properties are:

    • As long as there is at least one available non-null GLCapabilities which matches the "stereo" option, will return a valid index.
    • Attempts to match as closely as possible the given GLCapabilities, but will select one with fewer capabilities (i.e., lower color depth) if necessary.
    • Prefers hardware-accelerated visuals to non-hardware-accelerated.
    • If there is no exact match, prefers a more-capable visual to a less-capable one.
    • If there is more than one exact match, chooses an arbitrary one.
    • May select the opposite of a double- or single-buffered visual (based on the user's request) in dire situations.
    • Color depth (including alpha) mismatches are weighted higher than depth buffer mismatches, which are in turn weighted higher than accumulation buffer (including alpha) and stencil buffer depth mismatches.
    • If a valid windowSystemRecommendedChoice parameter is supplied, chooses that instead of using the cross-platform code.