javax.media.nativewindow

Class GraphicsConfigurationFactory

java.lang.Object

javax.media.nativewindow.GraphicsConfigurationFactory

public abstract class GraphicsConfigurationFactory
extends Object

Provides the mechanism by which the graphics configuration for a window can be chosen before the window is created. The graphics configuration decides parameters related to hardware accelerated rendering such as the OpenGL pixel format.
On some window systems (EGL/OpenKODE and X11 in particular) it is necessary to choose the graphics configuration early at window creation time.
Note that the selection of the graphics configuration is an algorithm which does not have strong dependencies on the particular Java window toolkit in use (e.g., AWT) and therefore it is strongly desirable to factor this functionality out of the core NativeWindowFactory so that new window toolkits can replace just the NativeWindowFactory and reuse the graphics configuration selection algorithm provided by, for example, an OpenGL binding.

Method Summary

Methods

Modifier and Type	Method and Description
AbstractGraphicsConfiguration	chooseGraphicsConfiguration(CapabilitiesImmutable capsChosen, CapabilitiesImmutable capsRequested, CapabilitiesChooser chooser, AbstractGraphicsScreen screen, int nativeVisualID) Selects a graphics configuration on the specified graphics device compatible with the supplied Capabilities.
static GraphicsConfigurationFactory	getFactory(AbstractGraphicsDevice device, CapabilitiesImmutable caps) Returns the graphics configuration factory for use with the given device and capability.
static GraphicsConfigurationFactory	getFactory(Class<?> deviceType, Class<?> capabilitiesType) Returns the graphics configuration factory for use with the given device and capability class.
static void	initSingleton()
static void	shutdown()

Methods inherited from class java.lang.Object

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

Method Detail

initSingleton

public static void initSingleton()

shutdown

public static void shutdown()

getFactory

public static GraphicsConfigurationFactory getFactory(AbstractGraphicsDevice device,
                                      CapabilitiesImmutable caps)

Returns the graphics configuration factory for use with the given device and capability.

See Also:

getFactory(Class, Class)

getFactory

public static GraphicsConfigurationFactory getFactory(Class<?> deviceType,
                                      Class<?> capabilitiesType)
                                               throws IllegalArgumentException,
                                                      NativeWindowException

Returns the graphics configuration factory for use with the given device and capability class.

Note: Registered device types maybe classes or interfaces, where capabilities types are interfaces only.

Pseudo code for finding a suitable factory is:

        For-All devT := getTopDownDeviceTypes(deviceType)
            For-All capsT := getTopDownCapabilitiesTypes(capabilitiesType)
               f = factory.get(devT, capsT);
               if(f) { return f; }
            end
        end
 

Parameters:

deviceType - the minimum capabilities class type accepted, must implement or extend AbstractGraphicsDevice

capabilitiesType - the minimum capabilities class type accepted, must implement or extend CapabilitiesImmutable

Throws:

IllegalArgumentException - if the deviceType does not implement AbstractGraphicsDevice or capabilitiesType does not implement CapabilitiesImmutable

NativeWindowException

chooseGraphicsConfiguration

public final AbstractGraphicsConfiguration chooseGraphicsConfiguration(CapabilitiesImmutable capsChosen,
                                                        CapabilitiesImmutable capsRequested,
                                                        CapabilitiesChooser chooser,
                                                        AbstractGraphicsScreen screen,
                                                        int nativeVisualID)
                                                                throws IllegalArgumentException,
                                                                       NativeWindowException

Selects a graphics configuration on the specified graphics device compatible with the supplied Capabilities. Some platforms (e.g.: X11, EGL, KD) require the graphics configuration to be specified when the native window is created. These architectures have seperated their device, screen, window and drawable context and hence are capable of quering the capabilities for each screen. A fully established window is not required.

Other platforms (e.g. Windows, MacOSX) don't offer the mentioned seperation and hence need a fully established window and it's drawable. Here the validation of the capabilities is performed later. In this case, the AbstractGraphicsConfiguration implementation must allow an overwrite of the Capabilites, for example DefaultGraphicsConfiguration.setChosenCapabilities(..).

This method is mainly intended to be both used and implemented by the OpenGL binding.

The concrete data type of the passed graphics device and returned graphics configuration must be specified in the documentation binding this particular API to the underlying window toolkit. The Reference Implementation accepts AWTGraphicsDevice objects and returns AWTGraphicsConfiguration objects. On X11 platforms where the AWT is not in use, it also accepts X11GraphicsDevice objects and returns X11GraphicsConfiguration objects.

Parameters:

capsChosen - the intermediate chosen capabilities to be refined by this implementation, may be equal to capsRequested

capsRequested - the original requested capabilities

chooser - the choosing implementation

screen - the referring Screen

nativeVisualID - if not VisualIDHolder.VID_UNDEFINED it reflects a pre-chosen visualID of the native platform's windowing system.

Returns:

the complete GraphicsConfiguration

Throws:

IllegalArgumentException - if the data type of the passed AbstractGraphicsDevice is not supported by this NativeWindowFactory.

NativeWindowException - if any window system-specific errors caused the selection of the graphics configuration to fail.

See Also:

javax.media.nativewindow.GraphicsConfigurationFactory#chooseGraphicsConfiguration(Capabilities, CapabilitiesChooser, AbstractGraphicsScreen), javax.media.nativewindow.DefaultGraphicsConfiguration#setChosenCapabilities(Capabilities caps)