com.jogamp.opengl.util

Class TileRendererBase

java.lang.Object

com.jogamp.opengl.util.TileRendererBase

Direct Known Subclasses:

RandomTileRenderer, TileRenderer

public abstract class TileRendererBase
extends Object

A fairly direct port of Brian Paul's tile rendering library, found at http://www.mesa3d.org/brianp/TR.html . I've java-fied it, but the functionality is the same.

Original code Copyright (C) 1997-2005 Brian Paul. Licensed under BSD-compatible terms with permission of the author. See LICENSE.txt for license information.

Enhanced for GL and GL2ES3, abstracted to suit TileRenderer and RandomTileRenderer.

PMV Matrix Considerations

The PMV matrix needs to be reshaped in user code after calling beginTile(GL), See beginTile(GL).

If attaching to an GLAutoDrawable, the TileRendererBase.TileRendererListener.reshapeTile(TileRendererBase, int, int, int, int, int, int) method is being called after beginTile(GL) for each rendered tile. It's implementation shall reshape the PMV matrix according to beginTile(GL).

GL Profile Requirement

Note that image buffer can only be used in conjunction w/ a GL instance ≥ GL2ES3 passed to beginTile(GL) and endTile(GL).
This is due to setting up the pack row length for an image width != tile-width, which usually is the case.
Hence a GLException is thrown in both methods, if using an image buffer and passing a GL instance < GL2ES3.

Further more, reading back of MSAA buffers is only supported since GL2ES3 since it requires to set the read-buffer.

Author:

ryanm, sgothel

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	TileRendererBase.TileRendererListener Listener for tile renderer events, intended to extend GLEventListener implementations, enabling tile rendering via attachAutoDrawable(GLAutoDrawable).

Field Summary

Fields

Modifier and Type	Field and Description
static int	TR_CURRENT_TILE_HEIGHT The height of the current tile.
static int	TR_CURRENT_TILE_WIDTH The width of the current tile.
static int	TR_CURRENT_TILE_X_POS The x-pos of the current tile.
static int	TR_CURRENT_TILE_Y_POS The y-pos of the current tile.
static int	TR_IMAGE_HEIGHT The height of the final image.
static int	TR_IMAGE_WIDTH The width of the final image.

Method Summary

Methods

Modifier and Type	Method and Description
void	attachAutoDrawable(GLAutoDrawable glad) Attaches the given GLAutoDrawable to this tile renderer.
abstract void	beginTile(GL gl) Begins rendering a tile.
void	detachAutoDrawable() Detaches the given GLAutoDrawable from this tile renderer.
void	display() Rendering one tile, by simply calling GLAutoDrawable.display().
abstract void	endTile(GL gl) Must be called after rendering the scene, see beginTile(GL).
abstract boolean	eot() Returns true if end of tiling has been reached, otherwise false.
GLAutoDrawable	getAttachedDrawable() Returns a previously attached GLAutoDrawable, null if none is attached.
GLPixelBuffer	getImageBuffer()
DimensionImmutable	getImageSize()
abstract int	getParam(int pname) Gets the parameters of this TileRenderer object
GLPixelBuffer	getTileBuffer()
abstract boolean	isSetup() Returns true if this instance is setup properly, i.e.
boolean	reqPreSwapBuffers(GLCapabilitiesImmutable chosenCaps) Determines whether the chosen GLCapabilitiesImmutable requires a pre-swap-buffers before accessing the results, i.e.
abstract void	reset() Method resets implementation's internal state to start of tiling as required for beginTile(GL) if end of tiling has been reached.
void	setGLEventListener(GLEventListener preTile, GLEventListener postTile) Set GLEventListener for pre- and post operations when used w/ attachAutoDrawable(GLAutoDrawable) for each GLEventListener callback.
void	setImageBuffer(GLPixelBuffer buffer) Sets the buffer in which to store the final image
void	setImageSize(int width, int height) Sets the desired size of the final image
void	setTileBuffer(GLPixelBuffer buffer) Specify a buffer the tiles to be copied to.
String	toString()
StringBuilder	toString(StringBuilder sb)

Methods inherited from class java.lang.Object

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

Field Detail

TR_IMAGE_WIDTH

public static final int TR_IMAGE_WIDTH

The width of the final image. See getParam(int).

See Also:

Constant Field Values

TR_IMAGE_HEIGHT

public static final int TR_IMAGE_HEIGHT

The height of the final image. See getParam(int).

See Also:

Constant Field Values

TR_CURRENT_TILE_X_POS

public static final int TR_CURRENT_TILE_X_POS

The x-pos of the current tile. See getParam(int).

See Also:

Constant Field Values

TR_CURRENT_TILE_Y_POS

public static final int TR_CURRENT_TILE_Y_POS

The y-pos of the current tile. See getParam(int).

See Also:

Constant Field Values

TR_CURRENT_TILE_WIDTH

public static final int TR_CURRENT_TILE_WIDTH

The width of the current tile. See getParam(int).

See Also:

Constant Field Values

TR_CURRENT_TILE_HEIGHT

public static final int TR_CURRENT_TILE_HEIGHT

The height of the current tile. See getParam(int).

See Also:

Constant Field Values

Method Detail

toString

public StringBuilder toString(StringBuilder sb)

toString

public String toString()

Overrides:

toString in class Object

getParam

public abstract int getParam(int pname)
                      throws IllegalArgumentException

Gets the parameters of this TileRenderer object

Parameters:

pname - The parameter name that is to be retrieved

Returns:

the value of the parameter

Throws:

IllegalArgumentException - if pname is not handled

setTileBuffer

public final void setTileBuffer(GLPixelBuffer buffer)

Specify a buffer the tiles to be copied to. This is not necessary for the creation of the final image, but useful if you want to inspect each tile in turn.

Parameters:

buffer - The buffer itself. Must be large enough to contain a random tile

getTileBuffer

public final GLPixelBuffer getTileBuffer()

See Also:

setTileBuffer(GLPixelBuffer)

setImageSize

public void setImageSize(int width,
                int height)

Sets the desired size of the final image

Parameters:

width - The width of the final image

height - The height of the final image

getImageSize

public final DimensionImmutable getImageSize()

See Also:

setImageSize(int, int)

setImageBuffer

public final void setImageBuffer(GLPixelBuffer buffer)

Sets the buffer in which to store the final image

Parameters:

buffer - the buffer itself, must be large enough to hold the final image

getImageBuffer

public final GLPixelBuffer getImageBuffer()

See Also:

setImageBuffer(GLPixelBuffer)

isSetup

public abstract boolean isSetup()

Returns true if this instance is setup properly, i.e. setImageSize(int, int) .., and ready for beginTile(GL). Otherwise returns false.

eot

public abstract boolean eot()

Returns true if end of tiling has been reached, otherwise false.

end of tiling criteria is implementation specific and may never be reached.

User needs to reset() tiling after reaching end of tiling before calling beginTile(GL) again.

reset

public abstract void reset()

Method resets implementation's internal state to start of tiling as required for beginTile(GL) if end of tiling has been reached.

Implementation is a nop where end of tiling is never reached.

beginTile

public abstract void beginTile(GL gl)
                        throws IllegalStateException,
                               GLException

Begins rendering a tile.

This method modifies the viewport, see below. User shall reset the viewport when finishing all tile rendering, i.e. after very last call of endTile(GL)!

The PMV Matrix must be reshaped after this call using:

• Current Viewport
  • x 0
  • y 0
  • current tile's width
  • current tile's height
• current tile's x-pos
• current tile's y-pos
• final image width
• final image height

Use shall render the scene afterwards, concluded with a call to this renderer endTile(GL).

User has to comply with the GL profile requirement.

If end of tiling has been reached, user needs to reset() tiling before calling this method.

Parameters:

gl - The gl context

Throws:

IllegalStateException - if image-size is undefined, an implementation related setup has not be performed or has been reached. See implementing classes.

GLException - if image buffer is used but gl instance is < GL2ES3

See Also:

isSetup(), eot(), reset()

endTile

public abstract void endTile(GL gl)
                      throws IllegalStateException,
                             GLException

Must be called after rendering the scene, see beginTile(GL).

Please consider reqPreSwapBuffers(GLCapabilitiesImmutable) to determine whether you need to perform swap-buffers before or after calling this method!

User has to comply with the GL profile requirement.

Parameters:

gl - the gl context

Throws:

IllegalStateException - if beginTile(gl) has not been called

GLException - if image buffer is used but gl instance is < GL2ES3

reqPreSwapBuffers

public final boolean reqPreSwapBuffers(GLCapabilitiesImmutable chosenCaps)

Determines whether the chosen GLCapabilitiesImmutable requires a pre-swap-buffers before accessing the results, i.e. before endTile(GL).

See GLDrawableUtil.swapBuffersBeforeRead(GLCapabilitiesImmutable).

attachAutoDrawable

public final void attachAutoDrawable(GLAutoDrawable glad)
                              throws IllegalStateException

Attaches the given GLAutoDrawable to this tile renderer.

The GLAutoDrawable's original GLEventListener are moved to this tile renderer.

GLEventListeners not implementing TileRendererBase.TileRendererListener are ignored while tile rendering.

The GLAutoDrawable's auto-swap mode is cached and set to false, since swapBuffers() maybe issued before endTile(GL), see reqPreSwapBuffers(GLCapabilitiesImmutable).

This tile renderer's internal GLEventListener is then added to the attached GLAutoDrawable to handle the tile rendering, replacing the original GLEventListener.
It's display implementations issues:

• Optional pre-glel.display(..)
• beginTile(GL)
• for all original TileRendererBase.TileRendererListener:
  • reshapeTile(tileX, tileY, tileWidth, tileHeight, imageWidth, imageHeight)
  • display(autoDrawable)
• if ( pre-swap ) { swapBuffers() }
• endTile(GL)
• if ( !pre-swap ) { swapBuffers() }
• Optional post-glel.display(..)

Consider using setGLEventListener(GLEventListener, GLEventListener) to add pre- and post hooks to be performed on this renderer GLEventListener.
The pre-hook is able to allocate memory and setup parameters, since it's called before beginTile(GL).
The post-hook is able to use the rendering result and can even shutdown tile-rendering, since it's called after endTile(GL).

Call detachAutoDrawable() to remove the attached GLAutoDrawable from this tile renderer and to restore it's original GLEventListener.

Parameters:

glad - the GLAutoDrawable to attach.

Throws:

IllegalStateException - if an GLAutoDrawable is already attached

See Also:

getAttachedDrawable(), detachAutoDrawable()

getAttachedDrawable

public final GLAutoDrawable getAttachedDrawable()

Returns a previously attached GLAutoDrawable, null if none is attached.

If called from TileRendererBase.TileRendererListener.addTileRendererNotify(TileRendererBase) or TileRendererBase.TileRendererListener.removeTileRendererNotify(TileRendererBase), method returns the just attached or soon to be detached GLAutoDrawable.

See Also:

attachAutoDrawable(GLAutoDrawable), detachAutoDrawable()

detachAutoDrawable

public final void detachAutoDrawable()

Detaches the given GLAutoDrawable from this tile renderer.

See Also:

attachAutoDrawable(GLAutoDrawable), getAttachedDrawable()

setGLEventListener

public final void setGLEventListener(GLEventListener preTile,
                      GLEventListener postTile)

Set GLEventListener for pre- and post operations when used w/ attachAutoDrawable(GLAutoDrawable) for each GLEventListener callback.

Parameters:

preTile - the pre operations

postTile - the post operations

display

public final void display()
                   throws IllegalStateException

Rendering one tile, by simply calling GLAutoDrawable.display().

Throws:

IllegalStateException - if no GLAutoDrawable is attached or imageSize is not set