axmol/cocos2dx/misc_nodes/CCRenderTexture.h

/****************************************************************************
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2009      Jason Booth

http://www.cocos2d-x.org

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#ifndef __CCRENDER_TEXTURE_H__
#define __CCRENDER_TEXTURE_H__

#include "base_nodes/CCNode.h"
#include "sprite_nodes/CCSprite.h"
#include "kazmath/mat4.h"

NS_CC_BEGIN

/**
 * @addtogroup textures
 * @{
 */

typedef enum eImageFormat
{
    kCCImageFormatJPEG      = 0,
    kCCImageFormatPNG       = 1,
} tCCImageFormat;
/**
@brief CCRenderTexture is a generic rendering target. To render things into it,
simply construct a render target, call begin on it, call visit on any cocos
scenes or objects to render them, and call end. For convenience, render texture
adds a sprite as it's display child with the results, so you can simply add
the render texture to your scene and treat it like any other CocosNode.
There are also functions for saving the render texture to disk in PNG or JPG format.

@since v0.8.1
*/
class CC_DLL CCRenderTexture : public CCNode 
{
    /** The CCSprite being used.
    The sprite, by default, will use the following blending function: GL_ONE, GL_ONE_MINUS_SRC_ALPHA.
    The blending function can be changed in runtime by calling:
    - [[renderTexture sprite] setBlendFunc:(ccBlendFunc){GL_ONE, GL_ONE_MINUS_SRC_ALPHA}];
    */
    CC_PROPERTY(CCSprite*, m_pSprite, Sprite)
public:
    CCRenderTexture();
    virtual ~CCRenderTexture();

    /** initializes a RenderTexture object with width and height in Points and a pixel format( only RGB and RGBA formats are valid ) and depthStencil format
    @deprecated: This interface will be deprecated sooner or later.
    */
    CC_DEPRECATED_ATTRIBUTE static CCRenderTexture * renderTextureWithWidthAndHeight(int w ,int h, CCTexture2DPixelFormat eFormat, GLuint uDepthStencilFormat);

    /** creates a RenderTexture object with width and height in Points and a pixel format, only RGB and RGBA formats are valid 
    @deprecated: This interface will be deprecated sooner or later.
    */
    CC_DEPRECATED_ATTRIBUTE static CCRenderTexture * renderTextureWithWidthAndHeight(int w, int h, CCTexture2DPixelFormat eFormat);

    /** creates a RenderTexture object with width and height in Points, pixel format is RGBA8888 
    @deprecated: This interface will be deprecated sooner or later.
    */
    CC_DEPRECATED_ATTRIBUTE static CCRenderTexture * renderTextureWithWidthAndHeight(int w, int h);

    /** initializes a RenderTexture object with width and height in Points and a pixel format( only RGB and RGBA formats are valid ) and depthStencil format*/
    static CCRenderTexture * create(int w ,int h, CCTexture2DPixelFormat eFormat, GLuint uDepthStencilFormat);

    /** creates a RenderTexture object with width and height in Points and a pixel format, only RGB and RGBA formats are valid */
    static CCRenderTexture * create(int w, int h, CCTexture2DPixelFormat eFormat);

    /** creates a RenderTexture object with width and height in Points, pixel format is RGBA8888 */
    static CCRenderTexture * create(int w, int h);

    /** initializes a RenderTexture object with width and height in Points and a pixel format, only RGB and RGBA formats are valid */
    bool initWithWidthAndHeight(int w, int h, CCTexture2DPixelFormat eFormat);

    /** initializes a RenderTexture object with width and height in Points and a pixel format( only RGB and RGBA formats are valid ) and depthStencil format*/
    bool initWithWidthAndHeight(int w, int h, CCTexture2DPixelFormat eFormat, GLuint uDepthStencilFormat);

    /** starts grabbing */
    void begin();

    /** starts rendering to the texture while clearing the texture first.
    This is more efficient then calling -clear first and then -begin */
    void beginWithClear(float r, float g, float b, float a);

    /** starts rendering to the texture while clearing the texture first.
     This is more efficient then calling -clear first and then -begin */
    void beginWithClear(float r, float g, float b, float a, float depthValue);

    /** starts rendering to the texture while clearing the texture first.
     This is more efficient then calling -clear first and then -begin */
    void beginWithClear(float r, float g, float b, float a, float depthValue, int stencilValue);

    /** end is key word of lua, use other name to export to lua. */
    inline void endToLua(){ end();};

    /** ends grabbing*/
    void end();

    /** clears the texture with a color */
    void clear(float r, float g, float b, float a);

    /** clears the texture with a specified depth value */
    void clearDepth(float depthValue);

    /** clears the texture with a specified stencil value */
    void clearStencil(int stencilValue);
    /* creates a new CCImage from with the texture's data.
       Caller is responsible for releasing it by calling delete.
     */
    CCImage* newCCImage();

    /** saves the texture into a file using JPEG format. The file will be saved in the Documents folder.
        Returns YES if the operation is successful.
     */
    bool saveToFile(const char *szFilePath);

    /** saves the texture into a file. The format could be JPG or PNG. The file will be saved in the Documents folder.
        Returns YES if the operation is successful.
     */
    bool saveToFile(const char *name, tCCImageFormat format);
    
    /** Listen "come to background" message, and save render texture.
     It only has effect on Android.
     */
    void listenToBackground(CCObject *obj);

protected:
    GLuint       m_uFBO;
    GLuint       m_uDepthRenderBufffer;
    GLint        m_nOldFBO;
    CCTexture2D* m_pTexture;
    CCTexture2D* m_pTextureCopy;    // a copy of m_pTexture
    CCImage*     m_pUITextureImage;
    GLenum       m_ePixelFormat;
};

// end of textures group
/// @}

NS_CC_END

#endif //__CCRENDER_TEXTURE_H__