javax.media.nativewindow

Class Capabilities

java.lang.Object

javax.media.nativewindow.Capabilities

All Implemented Interfaces:

WriteCloneable, Cloneable, Comparable<CapabilitiesImmutable>, CapabilitiesImmutable, VisualIDHolder

public class Capabilities
extends Object
implements CapabilitiesImmutable, Cloneable

Specifies a set of capabilities that a window's rendering context must support, such as color depth per channel. It currently contains the minimal number of routines which allow configuration on all supported window systems.

Nested Class Summary

Nested classes/interfaces inherited from interface javax.media.nativewindow.VisualIDHolder

VisualIDHolder.VIDComparator, VisualIDHolder.VIDType

Field Summary

Fields inherited from interface javax.media.nativewindow.VisualIDHolder

VID_UNDEFINED

Constructor Summary

Constructors

Constructor and Description
Capabilities() Creates a Capabilities object.

Method Summary

Methods

Modifier and Type	Method and Description
Object	clone()
Object	cloneMutable()
int	compareTo(CapabilitiesImmutable caps) Comparing RGBA values only
Capabilities	copyFrom(CapabilitiesImmutable other) Copies all Capabilities values from source into this instance.
boolean	equals(Object obj) Equality over the immutable attributes of both objects
int	getAlphaBits() Returns the number of bits for the color buffer's alpha component.
int	getBlueBits() Returns the number of bits for the color buffer's blue component.
int	getGreenBits() Returns the number of bits for the color buffer's green component.
int	getRedBits() Returns the number of bits for the color buffer's red component.
int	getTransparentAlphaValue() Gets the transparent alpha value for the frame buffer configuration.
int	getTransparentBlueValue() Gets the transparent blue value for the frame buffer configuration.
int	getTransparentGreenValue() Gets the transparent green value for the frame buffer configuration.
int	getTransparentRedValue() Gets the transparent red value for the frame buffer configuration.
int	getVisualID(VisualIDHolder.VIDType type) Returns the native visual ID of the given type if supported, or VisualIDHolder.VID_UNDEFINED if not supported.
int	hashCode() hash code over the immutable attributes of both objects
boolean	isBackgroundOpaque() Returns whether an opaque or translucent surface is requested, supported or chosen.
boolean	isBitmap() Returns whether bitmap offscreen mode is requested, available or chosen.
boolean	isOnscreen() Returns whether an on- or offscreen surface is requested, available or chosen.
void	setAlphaBits(int alphaBits) Sets the number of bits requested for the color buffer's alpha component.
void	setBackgroundOpaque(boolean opaque) Sets whether the surface shall be opaque or translucent.
void	setBitmap(boolean enable) Requesting offscreen bitmap mode.
void	setBlueBits(int blueBits) Sets the number of bits requested for the color buffer's blue component.
void	setGreenBits(int greenBits) Sets the number of bits requested for the color buffer's green component.
void	setOnscreen(boolean onscreen) Sets whether the surface shall be on- or offscreen.
void	setRedBits(int redBits) Sets the number of bits requested for the color buffer's red component.
void	setTransparentAlphaValue(int transValueAlpha) Sets the transparent alpha value for the frame buffer configuration, ranging from 0 to the maximum frame buffer value for alpha.
void	setTransparentBlueValue(int transValueBlue) Sets the transparent blue value for the frame buffer configuration, ranging from 0 to the maximum frame buffer value for blue.
void	setTransparentGreenValue(int transValueGreen) Sets the transparent green value for the frame buffer configuration, ranging from 0 to the maximum frame buffer value for green.
void	setTransparentRedValue(int transValueRed) Sets the transparent red value for the frame buffer configuration, ranging from 0 to the maximum frame buffer value for red.
String	toString() Returns a textual representation of this Capabilities object.
StringBuilder	toString(StringBuilder sink) Return a textual representation of this object.

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Capabilities

public Capabilities()

Creates a Capabilities object. All attributes are in a default state.

Method Detail

cloneMutable

public Object cloneMutable()

Specified by:

cloneMutable in interface WriteCloneable

clone

public Object clone()

Overrides:

clone in class Object

copyFrom

public Capabilities copyFrom(CapabilitiesImmutable other)

Copies all Capabilities values from source into this instance.

Returns:

this instance

hashCode

public int hashCode()

Description copied from interface: CapabilitiesImmutable

hash code over the immutable attributes of both objects

Specified by:

hashCode in interface CapabilitiesImmutable

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Description copied from interface: CapabilitiesImmutable

Equality over the immutable attributes of both objects

Specified by:

equals in interface CapabilitiesImmutable

Overrides:

equals in class Object

compareTo

public int compareTo(CapabilitiesImmutable caps)

Comparing RGBA values only

Specified by:

compareTo in interface Comparable<CapabilitiesImmutable>

getVisualID

public int getVisualID(VisualIDHolder.VIDType type)
                throws NativeWindowException

Description copied from interface: VisualIDHolder

Returns the native visual ID of the given type if supported, or VisualIDHolder.VID_UNDEFINED if not supported.

Depending on the native windowing system, type is handled as follows:

• X11 throws NativeWindowException on EGL_CONFIG, WIN32_PFD
  • INTRINSIC: X11 XVisual ID
  • NATIVE: X11 XVisual ID
  • X11_XVISUAL: X11 XVisual ID
  • X11_FBCONFIG: VID_UNDEFINED
• X11/GL throws NativeWindowException on EGL_CONFIG, WIN32_PFD
  • INTRINSIC: X11 XVisual ID
  • NATIVE: X11 XVisual ID
  • X11_XVISUAL: X11 XVisual ID
  • X11_FBCONFIG: X11 FBConfig ID or VID_UNDEFINED
• Windows/GL throws NativeWindowException on EGL_CONFIG, X11_XVISUAL, X11_FBCONFIG
  • INTRINSIC: Win32 PIXELFORMATDESCRIPTOR ID
  • NATIVE: Win32 PIXELFORMATDESCRIPTOR ID
  • WIN32_PFD: Win32 PIXELFORMATDESCRIPTOR ID
• EGL/GL throws NativeWindowException on X11_XVISUAL, X11_FBCONFIG, WIN32_PFD
  • INTRINSIC: EGL Config ID
  • NATIVE: EGL NativeVisual ID (X11 XVisual ID, Win32 PIXELFORMATDESCRIPTOR ID, ...)
  • EGL_CONFIG: EGL Config ID

Note: INTRINSIC and NATIVE are always handled, but may result in VisualIDHolder.VID_UNDEFINED. The latter is true if the native value are actually undefined or the corresponding object is not mapped to a native visual object.

Specified by:

getVisualID in interface VisualIDHolder

Throws:

NativeWindowException - if type is neither INTRINSIC nor NATIVE and does not match the native implementation.

getRedBits

public final int getRedBits()

Description copied from interface: CapabilitiesImmutable

Returns the number of bits for the color buffer's red component. On some systems only the color depth, which is the sum of the red, green, and blue bits, is considered.

Specified by:

getRedBits in interface CapabilitiesImmutable

setRedBits

public void setRedBits(int redBits)

Sets the number of bits requested for the color buffer's red component. On some systems only the color depth, which is the sum of the red, green, and blue bits, is considered.

getGreenBits

public final int getGreenBits()

Description copied from interface: CapabilitiesImmutable

Returns the number of bits for the color buffer's green component. On some systems only the color depth, which is the sum of the red, green, and blue bits, is considered.

Specified by:

getGreenBits in interface CapabilitiesImmutable

setGreenBits

public void setGreenBits(int greenBits)

Sets the number of bits requested for the color buffer's green component. On some systems only the color depth, which is the sum of the red, green, and blue bits, is considered.

getBlueBits

public final int getBlueBits()

Description copied from interface: CapabilitiesImmutable

Returns the number of bits for the color buffer's blue component. On some systems only the color depth, which is the sum of the red, green, and blue bits, is considered.

Specified by:

getBlueBits in interface CapabilitiesImmutable

setBlueBits

public void setBlueBits(int blueBits)

Sets the number of bits requested for the color buffer's blue component. On some systems only the color depth, which is the sum of the red, green, and blue bits, is considered.

getAlphaBits

public final int getAlphaBits()

Description copied from interface: CapabilitiesImmutable

Returns the number of bits for the color buffer's alpha component. On some systems only the color depth, which is the sum of the red, green, and blue bits, is considered.

Specified by:

getAlphaBits in interface CapabilitiesImmutable

setAlphaBits

public void setAlphaBits(int alphaBits)

Sets the number of bits requested for the color buffer's alpha component. On some systems only the color depth, which is the sum of the red, green, and blue bits, is considered.

Note: If alpha bits are zero, they are set to one by setBackgroundOpaque(boolean) and it's OpenGL specialization GLCapabilities::setSampleBuffers(boolean).
Ensure to call this method after the above to ensure a zero value.
The above automated settings takes into account, that the user calls this method to request alpha bits, not to reflect a current state. Nevertheless if this is the case - call it at last.

setBackgroundOpaque

public void setBackgroundOpaque(boolean opaque)

Sets whether the surface shall be opaque or translucent.

Platform implementations may need an alpha component in the surface (eg. Windows), or expect pre-multiplied alpha values (eg. X11/XRender).
To unify the experience, this method also invokes setAlphaBits(1) if getAlphaBits() == 0.
Please note that in case alpha is required on the platform the clear color shall have an alpha lower than 1.0 to allow anything shining through.

Mind that translucency may cause a performance penalty due to the composite work required by the window manager.

isBackgroundOpaque

public final boolean isBackgroundOpaque()

Description copied from interface: CapabilitiesImmutable

Returns whether an opaque or translucent surface is requested, supported or chosen.

Default is true, i.e. opaque.

Specified by:

isBackgroundOpaque in interface CapabilitiesImmutable

setOnscreen

public void setOnscreen(boolean onscreen)

Sets whether the surface shall be on- or offscreen.

Defaults to true.

If requesting an offscreen surface without further selection of it's mode, e.g. FBO, Pbuffer or bitmap, the implementation will choose the best available offscreen mode.

Parameters:

onscreen -

isOnscreen

public final boolean isOnscreen()

Description copied from interface: CapabilitiesImmutable

Returns whether an on- or offscreen surface is requested, available or chosen.

Default is true, i.e. onscreen.

Mind that an capabilities intance w/ available semantics may show onscreen, but also the offscreen modes FBO, Pbuffer or bitmap. This is valid, since one native configuration maybe used for either functionality.

Specified by:

isOnscreen in interface CapabilitiesImmutable

setBitmap

public void setBitmap(boolean enable)

Requesting offscreen bitmap mode.

If enabled this method also invokes setOnscreen(false).

Defaults to false.

Requesting offscreen bitmap mode disables the offscreen auto selection.

isBitmap

public boolean isBitmap()

Description copied from interface: CapabilitiesImmutable

Returns whether bitmap offscreen mode is requested, available or chosen.

Default is false.

For chosen capabilities, only the selected offscreen surface is set to true.

Specified by:

isBitmap in interface CapabilitiesImmutable

getTransparentRedValue

public final int getTransparentRedValue()

Description copied from interface: CapabilitiesImmutable

Gets the transparent red value for the frame buffer configuration. This value is undefined if; equals true.

Specified by:

getTransparentRedValue in interface CapabilitiesImmutable

getTransparentGreenValue

public final int getTransparentGreenValue()

Description copied from interface: CapabilitiesImmutable

Gets the transparent green value for the frame buffer configuration. This value is undefined if; equals true.

Specified by:

getTransparentGreenValue in interface CapabilitiesImmutable

getTransparentBlueValue

public final int getTransparentBlueValue()

Description copied from interface: CapabilitiesImmutable

Gets the transparent blue value for the frame buffer configuration. This value is undefined if; equals true.

Specified by:

getTransparentBlueValue in interface CapabilitiesImmutable

getTransparentAlphaValue

public final int getTransparentAlphaValue()

Description copied from interface: CapabilitiesImmutable

Gets the transparent alpha value for the frame buffer configuration. This value is undefined if; equals true.

Specified by:

getTransparentAlphaValue in interface CapabilitiesImmutable

setTransparentRedValue

public void setTransparentRedValue(int transValueRed)

Sets the transparent red value for the frame buffer configuration, ranging from 0 to the maximum frame buffer value for red. This value is ignored if isBackgroundOpaque() equals true.
It defaults to half of the frambuffer value for red.
A value of -1 is interpreted as any value.

setTransparentGreenValue

public void setTransparentGreenValue(int transValueGreen)

Sets the transparent green value for the frame buffer configuration, ranging from 0 to the maximum frame buffer value for green. This value is ignored if isBackgroundOpaque() equals true.
It defaults to half of the frambuffer value for green.
A value of -1 is interpreted as any value.

setTransparentBlueValue

public void setTransparentBlueValue(int transValueBlue)

Sets the transparent blue value for the frame buffer configuration, ranging from 0 to the maximum frame buffer value for blue. This value is ignored if isBackgroundOpaque() equals true.
It defaults to half of the frambuffer value for blue.
A value of -1 is interpreted as any value.

setTransparentAlphaValue

public void setTransparentAlphaValue(int transValueAlpha)

Sets the transparent alpha value for the frame buffer configuration, ranging from 0 to the maximum frame buffer value for alpha. This value is ignored if isBackgroundOpaque() equals true.
It defaults to half of the frambuffer value for alpha.
A value of -1 is interpreted as any value.

toString

public StringBuilder toString(StringBuilder sink)

Description copied from interface: CapabilitiesImmutable

Return a textual representation of this object. Use the given StringBuilder [optional].

Specified by:

toString in interface CapabilitiesImmutable

toString

public String toString()

Returns a textual representation of this Capabilities object.

Specified by:

toString in interface CapabilitiesImmutable

Overrides:

toString in class Object