axmol/cocos/2d/CCRenderTexture.h

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

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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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"
#include "platform/CCImage.h"

NS_CC_BEGIN

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

/**
@brief RenderTexture 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 RenderTexture : public Node 
{
public:
    /** 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 RenderTexture * create(int w ,int h, Texture2D::PixelFormat 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 RenderTexture * create(int w, int h, Texture2D::PixelFormat eFormat);

    /** creates a RenderTexture object with width and height in Points, pixel format is RGBA8888 */
    static RenderTexture * create(int w, int h);
    /**
     * @js ctor
     */
    RenderTexture();
    /**
     * @js NA
     * @lua NA
     */
    virtual ~RenderTexture();
    
    /** 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, Texture2D::PixelFormat 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, Texture2D::PixelFormat 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 Image from with the texture's data.
       Caller is responsible for releasing it by calling delete.
     */
    
    Image* newImage(bool flipImage = true);
    
    CC_DEPRECATED_ATTRIBUTE Image* newCCImage(bool flipImage = true) { return newImage(flipImage); };

    /** saves the texture into a file using JPEG format. The file will be saved in the Documents folder.
        Returns true 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 true if the operation is successful.
     */
    bool saveToFile(const char *name, Image::Format format);
    
    /** Listen "come to background" message, and save render texture.
     It only has effect on Android.
     */
    void listenToBackground(Object *obj);
    
    /** Listen "come to foreground" message and restore the frame buffer object
     It only has effect on Android.
     */
    void listenToForeground(Object *obj);
    
    /** Valid flags: GL_COLOR_BUFFER_BIT, GL_DEPTH_BUFFER_BIT, GL_STENCIL_BUFFER_BIT. They can be OR'ed. Valid when "autoDraw" is true. */
    inline unsigned int getClearFlags() const { return _clearFlags; };
    inline void setClearFlags(unsigned int clearFlags) { _clearFlags = clearFlags; };
    
    /** Clear color value. Valid only when "autoDraw" is true. */
    inline const Color4F& getClearColor() const { return _clearColor; };
    inline void setClearColor(const Color4F &clearColor) { _clearColor = clearColor; };
    
    /** Value for clearDepth. Valid only when "autoDraw" is true. */
    inline float getClearDepth() const { return _clearDepth; };
    inline void setClearDepth(float clearDepth) { _clearDepth = clearDepth; };
    
    /** Value for clear Stencil. Valid only when "autoDraw" is true */
    inline int getClearStencil() const { return _clearStencil; };
    inline void setClearStencil(int clearStencil) { _clearStencil = clearStencil; };
    
    /** When enabled, it will render its children into the texture automatically. Disabled by default for compatiblity reasons.
     Will be enabled in the future.
     */
    inline bool isAutoDraw() const { return _autoDraw; };
    inline void setAutoDraw(bool isAutoDraw) { _autoDraw = isAutoDraw; };

    /** Gets the Sprite being used. */
    inline Sprite* getSprite() const { return _sprite; };
    
    /** Sets the Sprite being used. */
    inline void setSprite(Sprite* sprite) {
        CC_SAFE_RETAIN(sprite);
        CC_SAFE_RELEASE(_sprite);
        _sprite = sprite;
    };
    
    // Overrides
    virtual void visit() override;
    virtual void draw() override;

private:
    void beginWithClear(float r, float g, float b, float a, float depthValue, int stencilValue, GLbitfield flags);

protected:
    GLuint       _FBO;
    GLuint       _depthRenderBufffer;
    GLint        _oldFBO;
    Texture2D* _texture;
    Texture2D* _textureCopy;    // a copy of _texture
    Image*     _UITextureImage;
    Texture2D::PixelFormat _pixelFormat;
    
    // code for "auto" update
    GLbitfield   _clearFlags;
    Color4F    _clearColor;
    GLclampf     _clearDepth;
    GLint        _clearStencil;
    bool         _autoDraw;

    /** The Sprite 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:(BlendFunc){GL_ONE, GL_ONE_MINUS_SRC_ALPHA}];
     */
    Sprite* _sprite;
};

// end of textures group
/// @}

NS_CC_END

#endif //__CCRENDER_TEXTURE_H__