Package icyllis.arc3d.granite

Class DrawAtlas.Plot

java.lang.Object

icyllis.arc3d.granite.DrawAtlas.PlotLocator

icyllis.arc3d.granite.DrawAtlas.Plot

All Implemented Interfaces:

AutoCloseable

Enclosing class:

DrawAtlas

public static class DrawAtlas.Plot
extends DrawAtlas.PlotLocator
implements AutoCloseable

The backing texture for an atlas is broken into a spatial grid of Plots. The Plots keep track of sub-image placement via their RectanglePacker.

Field Summary

Fields inherited from class icyllis.arc3d.granite.DrawAtlas.PlotLocator

kMaxPages, kMaxPlots

Constructor Summary

Constructors

Constructor	Description
Plot(int pageIndex, int plotIndex, DrawAtlas.AtlasGenerationCounter generationCounter, int plotX, int plotY, int width, int height, int colorType, int bpp)

Method Summary

Modifier and Type	Method	Description
boolean	addRect(int width, int height, DrawAtlas.AtlasLocator atlasLocator)	To add data to the Plot, first call addRect to see if it's possible.
void	clear()	Reset the Plot.
void	close()
void	copySubImage(DrawAtlas.AtlasLocator atlasLocator, Object srcBase, long srcAddr)	Copy sub-image, src data must be tightly packed.
long	dataAt(DrawAtlas.AtlasLocator atlasLocator)
long	getLastUseToken()	To manage the lifetime of a plot, we use last use token to determine when we can evict a plot from the cache, i.e.
void	incFlushesSinceLastUsed()
boolean	needsUpload()	Returns true if there's dirty data.
int	numFlushesSinceLastUsed()
long	prepareForUpload(Rect2i outRect)	Returns aligned, read-only memory address to the image data to upload, as it will be copied into a staging buffer.
void	resetFlushesSinceLastUsed()
void	setLastUseToken(long token)

Methods inherited from class icyllis.arc3d.granite.DrawAtlas.PlotLocator

getGeneration, getPageIndex, getPlotIndex, isValid, setGeneration, setLocation, setLocation, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

Plot

public Plot(int pageIndex,
 int plotIndex,
 DrawAtlas.AtlasGenerationCounter generationCounter,
 int plotX,
 int plotY,
 int width,
 int height,
 int colorType,
 int bpp)

Method Details

close

public void close()

Specified by:

close in interface AutoCloseable

addRect

public boolean addRect(int width,
 int height,
 DrawAtlas.AtlasLocator atlasLocator)

To add data to the Plot, first call addRect to see if it's possible. If successful, use the atlasLocator to get a pointer to the location in the atlas via dataAt(AtlasLocator) and render to that location, or if you already have data use copySubImage(AtlasLocator, Object, long).

dataAt

public long dataAt(DrawAtlas.AtlasLocator atlasLocator)

copySubImage

public void copySubImage(DrawAtlas.AtlasLocator atlasLocator,
 Object srcBase,
 long srcAddr)

Copy sub-image, src data must be tightly packed. This must be called and can only be called once after addRect(int, int, AtlasLocator).

getLastUseToken

public long getLastUseToken()

To manage the lifetime of a plot, we use last use token to determine when we can evict a plot from the cache, i.e. if the last use has already flushed through the gpu then we can reuse the plot.

setLastUseToken

public void setLastUseToken(long token)

numFlushesSinceLastUsed

public int numFlushesSinceLastUsed()

incFlushesSinceLastUsed

public void incFlushesSinceLastUsed()

resetFlushesSinceLastUsed

public void resetFlushesSinceLastUsed()

needsUpload

public boolean needsUpload()

Returns true if there's dirty data.

prepareForUpload

public long prepareForUpload(Rect2i outRect)

Returns aligned, read-only memory address to the image data to upload, as it will be copied into a staging buffer. The sub-image region will be stored in outRect in integer texture coordinates.

clear

public void clear()

Reset the Plot.

Zero out all the tracked data, DrawAtlas.PlotLocator.getGeneration() is incremented.