TextureAtlas Class Reference

#import <TextureAtlas.h>

List of all members.

Public Member Functions
(id)	- inithWithTexSizeX:texSizeY:cellSizeX:cellSizeY:
(BOOL)	- addImage:texOrg:texDest:
(BOOL)	- getImageLayout:texOrg:texDest:
	We cache the images and their coordinates. Query the cache.
(WhirlyGlobe::Texture *)	- createTexture
	Generate a texture from the images.
Protected Attributes
unsigned int	texSizeX
	Texture size.
unsigned int	texSizeY
unsigned int	gridSizeX
	Grid size (for sorting)
unsigned int	gridSizeY
unsigned int	cellSizeX
	Cell sieze.
unsigned int	cellSizeY
bool *	layoutGrid
	Used for sorting new images.
NSMutableArray *	images
	Images we've rendered so far (for lookup)

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Detailed Description

A Texture Atlas is an object used to consolidate textures for performance. OpenGL doesn't like having a lot of little textures and would much prefer one big one. This is how we do that. Texture Atlases are typically built on the fly with images that come in from other sources.

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Member Function Documentation

- (BOOL) addImage:		(UIImage *)	image
texOrg:		(WhirlyGlobe::TexCoord &)	org
texDest:		(WhirlyGlobe::TexCoord &)	dest

Add the image to this atlas and return texture coordinates to map into. Returns false if there wasn't room

- (id) inithWithTexSizeX:		(unsigned int)	texSizeX
texSizeY:		(unsigned int)	texSizeY
cellSizeX:		(unsigned int)	cellSizeX
cellSizeY:		(unsigned int)	cellSizeY

Construct with texture size (needs to be a power of 2). We sort images into buckets (sizeX/gridX,sizeY/gridY)

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The documentation for this class was generated from the following file:

• /Users/sjg/iPhone/WhirlyGlobe/WhirlyGlobeSrc/WhirlyGlobeLib/include/TextureAtlas.h