com.jogamp.opengl

Class DefaultGLCapabilitiesChooser

java.lang.Object

com.jogamp.opengl.DefaultGLCapabilitiesChooser

All Implemented Interfaces:

CapabilitiesChooser, GLCapabilitiesChooser

Direct Known Subclasses:

GenericGLCapabilitiesChooser

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.

Constructor Summary

Constructors

Constructor and Description
DefaultGLCapabilitiesChooser()

Method Summary

Methods

Modifier and Type	Method and Description
int	chooseCapabilities(CapabilitiesImmutable desired, List<? extends CapabilitiesImmutable> available, int windowSystemRecommendedChoice) Chooses the index (0..available.length - 1) of the Capabilities most closely matching the desired one from the list of all supported.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DefaultGLCapabilitiesChooser

public DefaultGLCapabilitiesChooser()

Method Detail

chooseCapabilities

public int chooseCapabilities(CapabilitiesImmutable desired,
                     List<? extends CapabilitiesImmutable> available,
                     int windowSystemRecommendedChoice)

Description copied from interface: com.jogamp.nativewindow.CapabilitiesChooser

Chooses the index (0..available.length - 1) of the Capabilities most closely matching the desired one from the list of all supported. Some of the entries in the available array may be null; the chooser must ignore these. The windowSystemRecommendedChoice parameter may be provided to the chooser by the underlying window system; if this index is valid, it is recommended, but not necessarily required, that the chooser select that entry.

Note: this method is called automatically by the GraphicsConfigurationFactory.chooseGraphicsConfiguration(com.jogamp.nativewindow.CapabilitiesImmutable, com.jogamp.nativewindow.CapabilitiesImmutable, com.jogamp.nativewindow.CapabilitiesChooser, com.jogamp.nativewindow.AbstractGraphicsScreen, int) method when an instance of this class is passed in to it. It should generally not be invoked by users directly, unless it is desired to delegate the choice to some other CapabilitiesChooser object.

Specified by:

chooseCapabilities in interface CapabilitiesChooser