axmol/cocos2dx/include/CCTexture2D.h

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#ifndef __CCTEXTURE2D_H__
#define __CCTEXTURE2D_H__

#include <string>
#include "CCObject.h"
#include "CCGeometry.h"
#include "ccTypes.h"

namespace   cocos2d {
class CCImage;

//CONSTANTS:

/** @typedef CCTexture2DPixelFormat
Possible texture pixel formats
*/
typedef enum {
	kCCTexture2DPixelFormat_Automatic = 0,
	//! 32-bit texture: RGBA8888
	kCCTexture2DPixelFormat_RGBA8888,
	//! 24-bit texture: RGBA888
	kCCTexture2DPixelFormat_RGB888,
	//! 16-bit texture without Alpha channel
	kCCTexture2DPixelFormat_RGB565,
	//! 8-bit textures used as masks
	kCCTexture2DPixelFormat_A8,
	//! 8-bit intensity texture
	kCCTexture2DPixelFormat_I8,
	//! 16-bit textures used as masks
	kCCTexture2DPixelFormat_AI88,
	//! 16-bit textures: RGBA4444
	kCCTexture2DPixelFormat_RGBA4444,
	//! 16-bit textures: RGB5A1
	kCCTexture2DPixelFormat_RGB5A1,	
	//! 4-bit PVRTC-compressed texture: PVRTC4
	kCCTexture2DPixelFormat_PVRTC4,
	//! 2-bit PVRTC-compressed texture: PVRTC2
	kCCTexture2DPixelFormat_PVRTC2,

	//! Default texture format: RGBA8888
	kCCTexture2DPixelFormat_Default = kCCTexture2DPixelFormat_RGBA8888,

	// backward compatibility stuff
	kTexture2DPixelFormat_Automatic = kCCTexture2DPixelFormat_Automatic,
	kTexture2DPixelFormat_RGBA8888 = kCCTexture2DPixelFormat_RGBA8888,
	kTexture2DPixelFormat_RGB888 = kCCTexture2DPixelFormat_RGB888,
	kTexture2DPixelFormat_RGB565 = kCCTexture2DPixelFormat_RGB565,
	kTexture2DPixelFormat_A8 = kCCTexture2DPixelFormat_A8,
	kTexture2DPixelFormat_RGBA4444 = kCCTexture2DPixelFormat_RGBA4444,
	kTexture2DPixelFormat_RGB5A1 = kCCTexture2DPixelFormat_RGB5A1,
	kTexture2DPixelFormat_Default = kCCTexture2DPixelFormat_Default

} CCTexture2DPixelFormat;

/**
Extension to set the Min / Mag filter
*/
typedef struct _ccTexParams {
	GLuint	minFilter;
	GLuint	magFilter;
	GLuint	wrapS;
	GLuint	wrapT;
} ccTexParams;

//CLASS INTERFACES:

/** @brief CCTexture2D class.
* This class allows to easily create OpenGL 2D textures from images, text or raw data.
* The created CCTexture2D object will always have power-of-two dimensions. 
* Depending on how you create the CCTexture2D object, the actual image area of the texture might be smaller than the texture dimensions i.e. "contentSize" != (pixelsWide, pixelsHigh) and (maxS, maxT) != (1.0, 1.0).
* Be aware that the content of the generated textures will be upside-down!
*/
class CC_DLL CCTexture2D : public CCObject
{
	/** pixel format of the texture */
	CC_PROPERTY_READONLY(CCTexture2DPixelFormat, m_ePixelFormat, PixelFormat)
	/** width in pixels */
	CC_PROPERTY_READONLY(unsigned int, m_uPixelsWide, PixelsWide)
	/** hight in pixels */
	CC_PROPERTY_READONLY(unsigned int, m_uPixelsHigh, PixelsHigh)

	/** texture name */
	CC_PROPERTY_READONLY(GLuint, m_uName, Name)

	/** content size */
	CC_PROPERTY_READONLY(CCSize, m_tContentSize, ContentSizeInPixels)
	/** texture max S */
	CC_PROPERTY(GLfloat, m_fMaxS, MaxS)
	/** texture max T */
	CC_PROPERTY(GLfloat, m_fMaxT, MaxT)
	/** whether or not the texture has their Alpha premultiplied */
	CC_PROPERTY_READONLY(bool, m_bHasPremultipliedAlpha, HasPremultipliedAlpha);

public:
	CCTexture2D();
	virtual ~CCTexture2D();

	char * description(void);

	/** These functions are needed to create mutable textures */
	void releaseData(void *data);
	void* keepData(void *data, unsigned int length);

	/** Intializes with a texture2d with data */
	bool initWithData(const void* data, CCTexture2DPixelFormat pixelFormat, unsigned int pixelsWide, unsigned int pixelsHigh, CCSize contentSize);

	/**
	Drawing extensions to make it easy to draw basic quads using a CCTexture2D object.
	These functions require GL_TEXTURE_2D and both GL_VERTEX_ARRAY and GL_TEXTURE_COORD_ARRAY client states to be enabled.
	*/
	/** draws a texture at a given point */
	void drawAtPoint(CCPoint point);
	/** draws a texture inside a rect */
	void drawInRect(CCRect rect);

	/**
	Extensions to make it easy to create a CCTexture2D object from an image file.
	Note that RGBA type textures will have their alpha premultiplied - use the blending mode (GL_ONE, GL_ONE_MINUS_SRC_ALPHA).
	*/
	/** Initializes a texture from a UIImage object */
	bool initWithImage(CCImage * uiImage);

	/**
	Extensions to make it easy to create a CCTexture2D object from a string of text.
	Note that the generated textures are of type A8 - use the blending mode (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA).
	*/
	/** Initializes a texture from a string with dimensions, alignment, font name and font size */
	bool initWithString(const char *text, CCSize dimensions, CCTextAlignment alignment, const char *fontName, float fontSize);
	/** Initializes a texture from a string with font name and font size */
	bool initWithString(const char *text, const char *fontName, float fontSize);

	/** returns the content size of the texture in points */
	CCSize getContentSize(void);

#ifdef _POWERVR_SUPPORT_
	/**
	Extensions to make it easy to create a CCTexture2D object from a PVRTC file
	Note that the generated textures don't have their alpha premultiplied - use the blending mode (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA).
	*/
	/** Initializes a texture from a PVRTC buffer */
	bool initWithPVRTCData(const void* data, int level, int bpp, bool hasAlpha, int length);
	/** Initializes a texture from a PVRTC file */
	bool initWithPVRTCFile(const char* file);
#endif

	/** sets the min filter, mag filter, wrap s and wrap t texture parameters.
	If the texture size is NPOT (non power of 2), then in can only use GL_CLAMP_TO_EDGE in GL_TEXTURE_WRAP_{S,T}.
	@since v0.8
	*/
	void setTexParameters(ccTexParams* texParams);

	/** sets antialias texture parameters:
	- GL_TEXTURE_MIN_FILTER = GL_LINEAR
	- GL_TEXTURE_MAG_FILTER = GL_LINEAR

	@since v0.8
	*/
	void setAntiAliasTexParameters();

	/** sets alias texture parameters:
	- GL_TEXTURE_MIN_FILTER = GL_NEAREST
	- GL_TEXTURE_MAG_FILTER = GL_NEAREST

	@since v0.8
	*/
	void setAliasTexParameters();


	/** Generates mipmap images for the texture.
	It only works if the texture size is POT (power of 2).
	@since v0.99.0
	*/
	void generateMipmap();

	/** returns the bits-per-pixel of the in-memory OpenGL texture
	@since v1.0
	*/
    unsigned int bitsPerPixelForFormat();


	/** sets the default pixel format for UIImages that contains alpha channel.
	If the UIImage contains alpha channel, then the options are:
	- generate 32-bit textures: kCCTexture2DPixelFormat_RGBA8888 (default one)
	- generate 24-bit textures: kCCTexture2DPixelFormat_RGB888
	- generate 16-bit textures: kCCTexture2DPixelFormat_RGBA4444
	- generate 16-bit textures: kCCTexture2DPixelFormat_RGB5A1
	- generate 16-bit textures: kCCTexture2DPixelFormat_RGB565
	- generate 8-bit textures: kCCTexture2DPixelFormat_A8 (only use it if you use just 1 color)

	How does it work ?
	- If the image is an RGBA (with Alpha) then the default pixel format will be used (it can be a 8-bit, 16-bit or 32-bit texture)
	- If the image is an RGB (without Alpha) then an RGB565 or RGB888 texture will be used (16-bit texture)

	@since v0.8
	*/
	static void setDefaultAlphaPixelFormat(CCTexture2DPixelFormat format);

	/** returns the alpha pixel format
	@since v0.8
	*/
	static CCTexture2DPixelFormat defaultAlphaPixelFormat();

private:
	bool initPremultipliedATextureWithImage(CCImage * image, unsigned int pixelsWide, unsigned int pixelsHigh);

};
}//namespace   cocos2d 

#endif //__CCTEXTURE2D_H__