axmol/cocos2dx/include/CCTextureAtlas.h

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#ifndef __CCTEXTURE_ATLAS_H__
#define __CCTEXTURE_ATLAS_H__


#include "CCTexture2D.h"
#include "ccTypes.h"
#include "ccConfig.h"

/** A class that implements a Texture Atlas.
Supported features:
* The atlas file can be a PVRTC, PNG or any other fomrat supported by Texture2D
* Quads can be udpated in runtime
* Quads can be added in runtime
* Quads can be removed in runtime
* Quads can be re-ordered in runtime
* The TextureAtlas capacity can be increased or decreased in runtime
* OpenGL component: V3F, C4B, T2F.
The quads are rendered using an OpenGL ES VBO.
To render the quads using an interleaved vertex array list, you should modify the ccConfig.h file 
*/
class CCTextureAtlas : public NSObject 
{
protected:
	GLushort			*m_pIndices;
#if CC_TEXTURE_ATLAS_USES_VBO
	GLuint				m_pBuffersVBO[2]; //0: vertex  1: indices
#endif // CC_TEXTURE_ATLAS_USES_VBO

	/** quantity of quads that are going to be drawn */
	CCX_PROPERTY_READONLY(UINT32, m_uTotalQuads, TotalQuads)
	/** quantity of quads that can be stored with the current texture atlas size */
	CCX_PROPERTY_READONLY(UINT32, m_uCapacity, Capacity)
	/** Texture of the texture atlas */
	CCX_PROPERTY(CCTexture2D *, m_pTexture, Texture)
	/** Quads that are going to be rendered */
	CCX_PROPERTY(ccV3F_C4B_T2F_Quad *, m_pQuads, Quads)

public:

	CCTextureAtlas();
	~CCTextureAtlas();

	std::string description();

	/** creates a TextureAtlas with an filename and with an initial capacity for Quads.
	* The TextureAtlas capacity can be increased in runtime.
	*/
	static CCTextureAtlas * textureAtlasWithFile(NSString* file , UINT32 capacity);

	/** initializes a TextureAtlas with a filename and with a certain capacity for Quads.
	* The TextureAtlas capacity can be increased in runtime.
	*
	* WARNING: Do not reinitialize the TextureAtlas because it will leak memory (issue #706)
	*/
	CCTextureAtlas * initWithFile(NSString* file, UINT32 capacity);

	/** creates a TextureAtlas with a previously initialized Texture2D object, and
	* with an initial capacity for n Quads. 
	* The TextureAtlas capacity can be increased in runtime.
	*/
	static CCTextureAtlas * textureAtlasWithTexture(CCTexture2D *tex, UINT32 capacity);

	/** initializes a TextureAtlas with a previously initialized Texture2D object, and
	* with an initial capacity for Quads. 
	* The TextureAtlas capacity can be increased in runtime.
	*
	* WARNING: Do not reinitialize the TextureAtlas because it will leak memory (issue #706)
	*/
	CCTextureAtlas * initWithTexture(CCTexture2D *tex, UINT32 capacity);

	/** updates a Quad (texture, vertex and color) at a certain index
	* index must be between 0 and the atlas capacity - 1
	@since v0.8
	*/
	void updateQuad(ccV3F_C4B_T2F_Quad* quad, UINT32 index);

	/** Inserts a Quad (texture, vertex and color) at a certain index
	index must be between 0 and the atlas capacity - 1
	@since v0.8
	*/
	void insertQuad(ccV3F_C4B_T2F_Quad* quad, UINT32 index);

	/** Removes the quad that is located at a certain index and inserts it at a new index
	This operation is faster than removing and inserting in a quad in 2 different steps
	@since v0.7.2
	*/
	void insertQuadFromIndex(UINT32 fromIndex, UINT32 newIndex);

	/** removes a quad at a given index number.
	The capacity remains the same, but the total number of quads to be drawn is reduced in 1
	@since v0.7.2
	*/
	void removeQuadAtIndex(UINT32 index);

	/** removes all Quads.
	The TextureAtlas capacity remains untouched. No memory is freed.
	The total number of quads to be drawn will be 0
	@since v0.7.2
	*/
	void removeAllQuads();


	/** resize the capacity of the Texture Atlas.
	* The new capacity can be lower or higher than the current one
	* It returns YES if the resize was successful.
	* If it fails to resize the capacity it will return NO with a new capacity of 0.
	*/
	bool resizeCapacity(UINT32 n);


	/** draws n quads
	* n can't be greater than the capacity of the Atlas
	*/
	void drawNumberOfQuads(UINT32 n);

	/** draws all the Atlas's Quads
	*/
	void drawQuads();
private:
	void initIndices();
};

#endif //__CCTEXTURE_ATLAS_H__